2 * Copyright © 2008-2015 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
29 #include <drm/drm_vma_manager.h>
30 #include <drm/i915_drm.h>
32 #include "i915_vgpu.h"
33 #include "i915_trace.h"
34 #include "intel_drv.h"
35 #include <linux/shmem_fs.h>
36 #include <linux/slab.h>
37 #include <linux/swap.h>
38 #include <linux/pci.h>
39 #include <linux/dma-buf.h>
41 #define RQ_BUG_ON(expr)
43 static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
44 static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj);
46 i915_gem_object_retire__write(struct drm_i915_gem_object *obj);
48 i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring);
50 static bool cpu_cache_is_coherent(struct drm_device *dev,
51 enum i915_cache_level level)
53 return HAS_LLC(dev) || level != I915_CACHE_NONE;
56 static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
58 if (!cpu_cache_is_coherent(obj->base.dev, obj->cache_level))
61 return obj->pin_display;
64 /* some bookkeeping */
65 static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
68 spin_lock(&dev_priv->mm.object_stat_lock);
69 dev_priv->mm.object_count++;
70 dev_priv->mm.object_memory += size;
71 spin_unlock(&dev_priv->mm.object_stat_lock);
74 static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
77 spin_lock(&dev_priv->mm.object_stat_lock);
78 dev_priv->mm.object_count--;
79 dev_priv->mm.object_memory -= size;
80 spin_unlock(&dev_priv->mm.object_stat_lock);
84 i915_gem_wait_for_error(struct i915_gpu_error *error)
88 #define EXIT_COND (!i915_reset_in_progress(error) || \
89 i915_terminally_wedged(error))
94 * Only wait 10 seconds for the gpu reset to complete to avoid hanging
95 * userspace. If it takes that long something really bad is going on and
96 * we should simply try to bail out and fail as gracefully as possible.
98 ret = wait_event_interruptible_timeout(error->reset_queue,
102 DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
104 } else if (ret < 0) {
112 int i915_mutex_lock_interruptible(struct drm_device *dev)
114 struct drm_i915_private *dev_priv = dev->dev_private;
117 ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
121 ret = mutex_lock_interruptible(&dev->struct_mutex);
125 WARN_ON(i915_verify_lists(dev));
130 i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
131 struct drm_file *file)
133 struct drm_i915_private *dev_priv = dev->dev_private;
134 struct drm_i915_gem_get_aperture *args = data;
135 struct i915_gtt *ggtt = &dev_priv->gtt;
136 struct i915_vma *vma;
140 mutex_lock(&dev->struct_mutex);
141 list_for_each_entry(vma, &ggtt->base.active_list, mm_list)
143 pinned += vma->node.size;
144 list_for_each_entry(vma, &ggtt->base.inactive_list, mm_list)
146 pinned += vma->node.size;
147 mutex_unlock(&dev->struct_mutex);
149 args->aper_size = dev_priv->gtt.base.total;
150 args->aper_available_size = args->aper_size - pinned;
156 i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
158 struct address_space *mapping = file_inode(obj->base.filp)->i_mapping;
159 char *vaddr = obj->phys_handle->vaddr;
161 struct scatterlist *sg;
164 if (WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
167 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
171 page = shmem_read_mapping_page(mapping, i);
173 return PTR_ERR(page);
175 src = kmap_atomic(page);
176 memcpy(vaddr, src, PAGE_SIZE);
177 drm_clflush_virt_range(vaddr, PAGE_SIZE);
180 page_cache_release(page);
184 i915_gem_chipset_flush(obj->base.dev);
186 st = kmalloc(sizeof(*st), GFP_KERNEL);
190 if (sg_alloc_table(st, 1, GFP_KERNEL)) {
197 sg->length = obj->base.size;
199 sg_dma_address(sg) = obj->phys_handle->busaddr;
200 sg_dma_len(sg) = obj->base.size;
207 i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj)
211 BUG_ON(obj->madv == __I915_MADV_PURGED);
213 ret = i915_gem_object_set_to_cpu_domain(obj, true);
215 /* In the event of a disaster, abandon all caches and
218 WARN_ON(ret != -EIO);
219 obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU;
222 if (obj->madv == I915_MADV_DONTNEED)
226 struct address_space *mapping = file_inode(obj->base.filp)->i_mapping;
227 char *vaddr = obj->phys_handle->vaddr;
230 for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
234 page = shmem_read_mapping_page(mapping, i);
238 dst = kmap_atomic(page);
239 drm_clflush_virt_range(vaddr, PAGE_SIZE);
240 memcpy(dst, vaddr, PAGE_SIZE);
243 set_page_dirty(page);
244 if (obj->madv == I915_MADV_WILLNEED)
245 mark_page_accessed(page);
246 page_cache_release(page);
252 sg_free_table(obj->pages);
257 i915_gem_object_release_phys(struct drm_i915_gem_object *obj)
259 drm_pci_free(obj->base.dev, obj->phys_handle);
262 static const struct drm_i915_gem_object_ops i915_gem_phys_ops = {
263 .get_pages = i915_gem_object_get_pages_phys,
264 .put_pages = i915_gem_object_put_pages_phys,
265 .release = i915_gem_object_release_phys,
269 drop_pages(struct drm_i915_gem_object *obj)
271 struct i915_vma *vma, *next;
274 drm_gem_object_reference(&obj->base);
275 list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link)
276 if (i915_vma_unbind(vma))
279 ret = i915_gem_object_put_pages(obj);
280 drm_gem_object_unreference(&obj->base);
286 i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
289 drm_dma_handle_t *phys;
292 if (obj->phys_handle) {
293 if ((unsigned long)obj->phys_handle->vaddr & (align -1))
299 if (obj->madv != I915_MADV_WILLNEED)
302 if (obj->base.filp == NULL)
305 ret = drop_pages(obj);
309 /* create a new object */
310 phys = drm_pci_alloc(obj->base.dev, obj->base.size, align);
314 obj->phys_handle = phys;
315 obj->ops = &i915_gem_phys_ops;
317 return i915_gem_object_get_pages(obj);
321 i915_gem_phys_pwrite(struct drm_i915_gem_object *obj,
322 struct drm_i915_gem_pwrite *args,
323 struct drm_file *file_priv)
325 struct drm_device *dev = obj->base.dev;
326 void *vaddr = obj->phys_handle->vaddr + args->offset;
327 char __user *user_data = to_user_ptr(args->data_ptr);
330 /* We manually control the domain here and pretend that it
331 * remains coherent i.e. in the GTT domain, like shmem_pwrite.
333 ret = i915_gem_object_wait_rendering(obj, false);
337 intel_fb_obj_invalidate(obj, ORIGIN_CPU);
338 if (__copy_from_user_inatomic_nocache(vaddr, user_data, args->size)) {
339 unsigned long unwritten;
341 /* The physical object once assigned is fixed for the lifetime
342 * of the obj, so we can safely drop the lock and continue
345 mutex_unlock(&dev->struct_mutex);
346 unwritten = copy_from_user(vaddr, user_data, args->size);
347 mutex_lock(&dev->struct_mutex);
354 drm_clflush_virt_range(vaddr, args->size);
355 i915_gem_chipset_flush(dev);
358 intel_fb_obj_flush(obj, false, ORIGIN_CPU);
362 void *i915_gem_object_alloc(struct drm_device *dev)
364 struct drm_i915_private *dev_priv = dev->dev_private;
365 return kmem_cache_zalloc(dev_priv->objects, GFP_KERNEL);
368 void i915_gem_object_free(struct drm_i915_gem_object *obj)
370 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
371 kmem_cache_free(dev_priv->objects, obj);
375 i915_gem_create(struct drm_file *file,
376 struct drm_device *dev,
380 struct drm_i915_gem_object *obj;
384 size = roundup(size, PAGE_SIZE);
388 /* Allocate the new object */
389 obj = i915_gem_alloc_object(dev, size);
393 ret = drm_gem_handle_create(file, &obj->base, &handle);
394 /* drop reference from allocate - handle holds it now */
395 drm_gem_object_unreference_unlocked(&obj->base);
404 i915_gem_dumb_create(struct drm_file *file,
405 struct drm_device *dev,
406 struct drm_mode_create_dumb *args)
408 /* have to work out size/pitch and return them */
409 args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 64);
410 args->size = args->pitch * args->height;
411 return i915_gem_create(file, dev,
412 args->size, &args->handle);
416 * Creates a new mm object and returns a handle to it.
419 i915_gem_create_ioctl(struct drm_device *dev, void *data,
420 struct drm_file *file)
422 struct drm_i915_gem_create *args = data;
424 return i915_gem_create(file, dev,
425 args->size, &args->handle);
429 __copy_to_user_swizzled(char __user *cpu_vaddr,
430 const char *gpu_vaddr, int gpu_offset,
433 int ret, cpu_offset = 0;
436 int cacheline_end = ALIGN(gpu_offset + 1, 64);
437 int this_length = min(cacheline_end - gpu_offset, length);
438 int swizzled_gpu_offset = gpu_offset ^ 64;
440 ret = __copy_to_user(cpu_vaddr + cpu_offset,
441 gpu_vaddr + swizzled_gpu_offset,
446 cpu_offset += this_length;
447 gpu_offset += this_length;
448 length -= this_length;
455 __copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,
456 const char __user *cpu_vaddr,
459 int ret, cpu_offset = 0;
462 int cacheline_end = ALIGN(gpu_offset + 1, 64);
463 int this_length = min(cacheline_end - gpu_offset, length);
464 int swizzled_gpu_offset = gpu_offset ^ 64;
466 ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset,
467 cpu_vaddr + cpu_offset,
472 cpu_offset += this_length;
473 gpu_offset += this_length;
474 length -= this_length;
481 * Pins the specified object's pages and synchronizes the object with
482 * GPU accesses. Sets needs_clflush to non-zero if the caller should
483 * flush the object from the CPU cache.
485 int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
495 if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {
496 /* If we're not in the cpu read domain, set ourself into the gtt
497 * read domain and manually flush cachelines (if required). This
498 * optimizes for the case when the gpu will dirty the data
499 * anyway again before the next pread happens. */
500 *needs_clflush = !cpu_cache_is_coherent(obj->base.dev,
502 ret = i915_gem_object_wait_rendering(obj, true);
507 ret = i915_gem_object_get_pages(obj);
511 i915_gem_object_pin_pages(obj);
516 /* Per-page copy function for the shmem pread fastpath.
517 * Flushes invalid cachelines before reading the target if
518 * needs_clflush is set. */
520 shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length,
521 char __user *user_data,
522 bool page_do_bit17_swizzling, bool needs_clflush)
527 if (unlikely(page_do_bit17_swizzling))
530 vaddr = kmap_atomic(page);
532 drm_clflush_virt_range(vaddr + shmem_page_offset,
534 ret = __copy_to_user_inatomic(user_data,
535 vaddr + shmem_page_offset,
537 kunmap_atomic(vaddr);
539 return ret ? -EFAULT : 0;
543 shmem_clflush_swizzled_range(char *addr, unsigned long length,
546 if (unlikely(swizzled)) {
547 unsigned long start = (unsigned long) addr;
548 unsigned long end = (unsigned long) addr + length;
550 /* For swizzling simply ensure that we always flush both
551 * channels. Lame, but simple and it works. Swizzled
552 * pwrite/pread is far from a hotpath - current userspace
553 * doesn't use it at all. */
554 start = round_down(start, 128);
555 end = round_up(end, 128);
557 drm_clflush_virt_range((void *)start, end - start);
559 drm_clflush_virt_range(addr, length);
564 /* Only difference to the fast-path function is that this can handle bit17
565 * and uses non-atomic copy and kmap functions. */
567 shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length,
568 char __user *user_data,
569 bool page_do_bit17_swizzling, bool needs_clflush)
576 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
578 page_do_bit17_swizzling);
580 if (page_do_bit17_swizzling)
581 ret = __copy_to_user_swizzled(user_data,
582 vaddr, shmem_page_offset,
585 ret = __copy_to_user(user_data,
586 vaddr + shmem_page_offset,
590 return ret ? - EFAULT : 0;
594 i915_gem_shmem_pread(struct drm_device *dev,
595 struct drm_i915_gem_object *obj,
596 struct drm_i915_gem_pread *args,
597 struct drm_file *file)
599 char __user *user_data;
602 int shmem_page_offset, page_length, ret = 0;
603 int obj_do_bit17_swizzling, page_do_bit17_swizzling;
605 int needs_clflush = 0;
606 struct sg_page_iter sg_iter;
608 user_data = to_user_ptr(args->data_ptr);
611 obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
613 ret = i915_gem_obj_prepare_shmem_read(obj, &needs_clflush);
617 offset = args->offset;
619 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents,
620 offset >> PAGE_SHIFT) {
621 struct page *page = sg_page_iter_page(&sg_iter);
626 /* Operation in this page
628 * shmem_page_offset = offset within page in shmem file
629 * page_length = bytes to copy for this page
631 shmem_page_offset = offset_in_page(offset);
632 page_length = remain;
633 if ((shmem_page_offset + page_length) > PAGE_SIZE)
634 page_length = PAGE_SIZE - shmem_page_offset;
636 page_do_bit17_swizzling = obj_do_bit17_swizzling &&
637 (page_to_phys(page) & (1 << 17)) != 0;
639 ret = shmem_pread_fast(page, shmem_page_offset, page_length,
640 user_data, page_do_bit17_swizzling,
645 mutex_unlock(&dev->struct_mutex);
647 if (likely(!i915.prefault_disable) && !prefaulted) {
648 ret = fault_in_multipages_writeable(user_data, remain);
649 /* Userspace is tricking us, but we've already clobbered
650 * its pages with the prefault and promised to write the
651 * data up to the first fault. Hence ignore any errors
652 * and just continue. */
657 ret = shmem_pread_slow(page, shmem_page_offset, page_length,
658 user_data, page_do_bit17_swizzling,
661 mutex_lock(&dev->struct_mutex);
667 remain -= page_length;
668 user_data += page_length;
669 offset += page_length;
673 i915_gem_object_unpin_pages(obj);
679 * Reads data from the object referenced by handle.
681 * On error, the contents of *data are undefined.
684 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
685 struct drm_file *file)
687 struct drm_i915_gem_pread *args = data;
688 struct drm_i915_gem_object *obj;
694 if (!access_ok(VERIFY_WRITE,
695 to_user_ptr(args->data_ptr),
699 ret = i915_mutex_lock_interruptible(dev);
703 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
704 if (&obj->base == NULL) {
709 /* Bounds check source. */
710 if (args->offset > obj->base.size ||
711 args->size > obj->base.size - args->offset) {
716 /* prime objects have no backing filp to GEM pread/pwrite
719 if (!obj->base.filp) {
724 trace_i915_gem_object_pread(obj, args->offset, args->size);
726 ret = i915_gem_shmem_pread(dev, obj, args, file);
729 drm_gem_object_unreference(&obj->base);
731 mutex_unlock(&dev->struct_mutex);
735 /* This is the fast write path which cannot handle
736 * page faults in the source data
740 fast_user_write(struct io_mapping *mapping,
741 loff_t page_base, int page_offset,
742 char __user *user_data,
745 void __iomem *vaddr_atomic;
747 unsigned long unwritten;
749 vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
750 /* We can use the cpu mem copy function because this is X86. */
751 vaddr = (void __force*)vaddr_atomic + page_offset;
752 unwritten = __copy_from_user_inatomic_nocache(vaddr,
754 io_mapping_unmap_atomic(vaddr_atomic);
759 * This is the fast pwrite path, where we copy the data directly from the
760 * user into the GTT, uncached.
763 i915_gem_gtt_pwrite_fast(struct drm_device *dev,
764 struct drm_i915_gem_object *obj,
765 struct drm_i915_gem_pwrite *args,
766 struct drm_file *file)
768 struct drm_i915_private *dev_priv = dev->dev_private;
770 loff_t offset, page_base;
771 char __user *user_data;
772 int page_offset, page_length, ret;
774 ret = i915_gem_obj_ggtt_pin(obj, 0, PIN_MAPPABLE | PIN_NONBLOCK);
778 ret = i915_gem_object_set_to_gtt_domain(obj, true);
782 ret = i915_gem_object_put_fence(obj);
786 user_data = to_user_ptr(args->data_ptr);
789 offset = i915_gem_obj_ggtt_offset(obj) + args->offset;
791 intel_fb_obj_invalidate(obj, ORIGIN_GTT);
794 /* Operation in this page
796 * page_base = page offset within aperture
797 * page_offset = offset within page
798 * page_length = bytes to copy for this page
800 page_base = offset & PAGE_MASK;
801 page_offset = offset_in_page(offset);
802 page_length = remain;
803 if ((page_offset + remain) > PAGE_SIZE)
804 page_length = PAGE_SIZE - page_offset;
806 /* If we get a fault while copying data, then (presumably) our
807 * source page isn't available. Return the error and we'll
808 * retry in the slow path.
810 if (fast_user_write(dev_priv->gtt.mappable, page_base,
811 page_offset, user_data, page_length)) {
816 remain -= page_length;
817 user_data += page_length;
818 offset += page_length;
822 intel_fb_obj_flush(obj, false, ORIGIN_GTT);
824 i915_gem_object_ggtt_unpin(obj);
829 /* Per-page copy function for the shmem pwrite fastpath.
830 * Flushes invalid cachelines before writing to the target if
831 * needs_clflush_before is set and flushes out any written cachelines after
832 * writing if needs_clflush is set. */
834 shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length,
835 char __user *user_data,
836 bool page_do_bit17_swizzling,
837 bool needs_clflush_before,
838 bool needs_clflush_after)
843 if (unlikely(page_do_bit17_swizzling))
846 vaddr = kmap_atomic(page);
847 if (needs_clflush_before)
848 drm_clflush_virt_range(vaddr + shmem_page_offset,
850 ret = __copy_from_user_inatomic(vaddr + shmem_page_offset,
851 user_data, page_length);
852 if (needs_clflush_after)
853 drm_clflush_virt_range(vaddr + shmem_page_offset,
855 kunmap_atomic(vaddr);
857 return ret ? -EFAULT : 0;
860 /* Only difference to the fast-path function is that this can handle bit17
861 * and uses non-atomic copy and kmap functions. */
863 shmem_pwrite_slow(struct page *page, int shmem_page_offset, int page_length,
864 char __user *user_data,
865 bool page_do_bit17_swizzling,
866 bool needs_clflush_before,
867 bool needs_clflush_after)
873 if (unlikely(needs_clflush_before || page_do_bit17_swizzling))
874 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
876 page_do_bit17_swizzling);
877 if (page_do_bit17_swizzling)
878 ret = __copy_from_user_swizzled(vaddr, shmem_page_offset,
882 ret = __copy_from_user(vaddr + shmem_page_offset,
885 if (needs_clflush_after)
886 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
888 page_do_bit17_swizzling);
891 return ret ? -EFAULT : 0;
895 i915_gem_shmem_pwrite(struct drm_device *dev,
896 struct drm_i915_gem_object *obj,
897 struct drm_i915_gem_pwrite *args,
898 struct drm_file *file)
902 char __user *user_data;
903 int shmem_page_offset, page_length, ret = 0;
904 int obj_do_bit17_swizzling, page_do_bit17_swizzling;
905 int hit_slowpath = 0;
906 int needs_clflush_after = 0;
907 int needs_clflush_before = 0;
908 struct sg_page_iter sg_iter;
910 user_data = to_user_ptr(args->data_ptr);
913 obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
915 if (obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
916 /* If we're not in the cpu write domain, set ourself into the gtt
917 * write domain and manually flush cachelines (if required). This
918 * optimizes for the case when the gpu will use the data
919 * right away and we therefore have to clflush anyway. */
920 needs_clflush_after = cpu_write_needs_clflush(obj);
921 ret = i915_gem_object_wait_rendering(obj, false);
925 /* Same trick applies to invalidate partially written cachelines read
927 if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0)
928 needs_clflush_before =
929 !cpu_cache_is_coherent(dev, obj->cache_level);
931 ret = i915_gem_object_get_pages(obj);
935 intel_fb_obj_invalidate(obj, ORIGIN_CPU);
937 i915_gem_object_pin_pages(obj);
939 offset = args->offset;
942 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents,
943 offset >> PAGE_SHIFT) {
944 struct page *page = sg_page_iter_page(&sg_iter);
945 int partial_cacheline_write;
950 /* Operation in this page
952 * shmem_page_offset = offset within page in shmem file
953 * page_length = bytes to copy for this page
955 shmem_page_offset = offset_in_page(offset);
957 page_length = remain;
958 if ((shmem_page_offset + page_length) > PAGE_SIZE)
959 page_length = PAGE_SIZE - shmem_page_offset;
961 /* If we don't overwrite a cacheline completely we need to be
962 * careful to have up-to-date data by first clflushing. Don't
963 * overcomplicate things and flush the entire patch. */
964 partial_cacheline_write = needs_clflush_before &&
965 ((shmem_page_offset | page_length)
966 & (boot_cpu_data.x86_clflush_size - 1));
968 page_do_bit17_swizzling = obj_do_bit17_swizzling &&
969 (page_to_phys(page) & (1 << 17)) != 0;
971 ret = shmem_pwrite_fast(page, shmem_page_offset, page_length,
972 user_data, page_do_bit17_swizzling,
973 partial_cacheline_write,
974 needs_clflush_after);
979 mutex_unlock(&dev->struct_mutex);
980 ret = shmem_pwrite_slow(page, shmem_page_offset, page_length,
981 user_data, page_do_bit17_swizzling,
982 partial_cacheline_write,
983 needs_clflush_after);
985 mutex_lock(&dev->struct_mutex);
991 remain -= page_length;
992 user_data += page_length;
993 offset += page_length;
997 i915_gem_object_unpin_pages(obj);
1001 * Fixup: Flush cpu caches in case we didn't flush the dirty
1002 * cachelines in-line while writing and the object moved
1003 * out of the cpu write domain while we've dropped the lock.
1005 if (!needs_clflush_after &&
1006 obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
1007 if (i915_gem_clflush_object(obj, obj->pin_display))
1008 needs_clflush_after = true;
1012 if (needs_clflush_after)
1013 i915_gem_chipset_flush(dev);
1015 obj->cache_dirty = true;
1017 intel_fb_obj_flush(obj, false, ORIGIN_CPU);
1022 * Writes data to the object referenced by handle.
1024 * On error, the contents of the buffer that were to be modified are undefined.
1027 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
1028 struct drm_file *file)
1030 struct drm_i915_private *dev_priv = dev->dev_private;
1031 struct drm_i915_gem_pwrite *args = data;
1032 struct drm_i915_gem_object *obj;
1035 if (args->size == 0)
1038 if (!access_ok(VERIFY_READ,
1039 to_user_ptr(args->data_ptr),
1043 if (likely(!i915.prefault_disable)) {
1044 ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
1050 intel_runtime_pm_get(dev_priv);
1052 ret = i915_mutex_lock_interruptible(dev);
1056 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1057 if (&obj->base == NULL) {
1062 /* Bounds check destination. */
1063 if (args->offset > obj->base.size ||
1064 args->size > obj->base.size - args->offset) {
1069 /* prime objects have no backing filp to GEM pread/pwrite
1072 if (!obj->base.filp) {
1077 trace_i915_gem_object_pwrite(obj, args->offset, args->size);
1080 /* We can only do the GTT pwrite on untiled buffers, as otherwise
1081 * it would end up going through the fenced access, and we'll get
1082 * different detiling behavior between reading and writing.
1083 * pread/pwrite currently are reading and writing from the CPU
1084 * perspective, requiring manual detiling by the client.
1086 if (obj->tiling_mode == I915_TILING_NONE &&
1087 obj->base.write_domain != I915_GEM_DOMAIN_CPU &&
1088 cpu_write_needs_clflush(obj)) {
1089 ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file);
1090 /* Note that the gtt paths might fail with non-page-backed user
1091 * pointers (e.g. gtt mappings when moving data between
1092 * textures). Fallback to the shmem path in that case. */
1095 if (ret == -EFAULT || ret == -ENOSPC) {
1096 if (obj->phys_handle)
1097 ret = i915_gem_phys_pwrite(obj, args, file);
1099 ret = i915_gem_shmem_pwrite(dev, obj, args, file);
1103 drm_gem_object_unreference(&obj->base);
1105 mutex_unlock(&dev->struct_mutex);
1107 intel_runtime_pm_put(dev_priv);
1113 i915_gem_check_wedge(struct i915_gpu_error *error,
1116 if (i915_reset_in_progress(error)) {
1117 /* Non-interruptible callers can't handle -EAGAIN, hence return
1118 * -EIO unconditionally for these. */
1122 /* Recovery complete, but the reset failed ... */
1123 if (i915_terminally_wedged(error))
1127 * Check if GPU Reset is in progress - we need intel_ring_begin
1128 * to work properly to reinit the hw state while the gpu is
1129 * still marked as reset-in-progress. Handle this with a flag.
1131 if (!error->reload_in_reset)
1138 static void fake_irq(unsigned long data)
1140 wake_up_process((struct task_struct *)data);
1143 static bool missed_irq(struct drm_i915_private *dev_priv,
1144 struct intel_engine_cs *ring)
1146 return test_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings);
1149 static unsigned long local_clock_us(unsigned *cpu)
1153 /* Cheaply and approximately convert from nanoseconds to microseconds.
1154 * The result and subsequent calculations are also defined in the same
1155 * approximate microseconds units. The principal source of timing
1156 * error here is from the simple truncation.
1158 * Note that local_clock() is only defined wrt to the current CPU;
1159 * the comparisons are no longer valid if we switch CPUs. Instead of
1160 * blocking preemption for the entire busywait, we can detect the CPU
1161 * switch and use that as indicator of system load and a reason to
1162 * stop busywaiting, see busywait_stop().
1165 t = local_clock() >> 10;
1171 static bool busywait_stop(unsigned long timeout, unsigned cpu)
1175 if (time_after(local_clock_us(&this_cpu), timeout))
1178 return this_cpu != cpu;
1181 static int __i915_spin_request(struct drm_i915_gem_request *req, int state)
1183 unsigned long timeout;
1186 /* When waiting for high frequency requests, e.g. during synchronous
1187 * rendering split between the CPU and GPU, the finite amount of time
1188 * required to set up the irq and wait upon it limits the response
1189 * rate. By busywaiting on the request completion for a short while we
1190 * can service the high frequency waits as quick as possible. However,
1191 * if it is a slow request, we want to sleep as quickly as possible.
1192 * The tradeoff between waiting and sleeping is roughly the time it
1193 * takes to sleep on a request, on the order of a microsecond.
1196 if (req->ring->irq_refcount)
1199 /* Only spin if we know the GPU is processing this request */
1200 if (!i915_gem_request_started(req, true))
1203 timeout = local_clock_us(&cpu) + 5;
1204 while (!need_resched()) {
1205 if (i915_gem_request_completed(req, true))
1208 if (signal_pending_state(state, current))
1211 if (busywait_stop(timeout, cpu))
1214 cpu_relax_lowlatency();
1217 if (i915_gem_request_completed(req, false))
1224 * __i915_wait_request - wait until execution of request has finished
1226 * @reset_counter: reset sequence associated with the given request
1227 * @interruptible: do an interruptible wait (normally yes)
1228 * @timeout: in - how long to wait (NULL forever); out - how much time remaining
1230 * Note: It is of utmost importance that the passed in seqno and reset_counter
1231 * values have been read by the caller in an smp safe manner. Where read-side
1232 * locks are involved, it is sufficient to read the reset_counter before
1233 * unlocking the lock that protects the seqno. For lockless tricks, the
1234 * reset_counter _must_ be read before, and an appropriate smp_rmb must be
1237 * Returns 0 if the request was found within the alloted time. Else returns the
1238 * errno with remaining time filled in timeout argument.
1240 int __i915_wait_request(struct drm_i915_gem_request *req,
1241 unsigned reset_counter,
1244 struct intel_rps_client *rps)
1246 struct intel_engine_cs *ring = i915_gem_request_get_ring(req);
1247 struct drm_device *dev = ring->dev;
1248 struct drm_i915_private *dev_priv = dev->dev_private;
1249 const bool irq_test_in_progress =
1250 ACCESS_ONCE(dev_priv->gpu_error.test_irq_rings) & intel_ring_flag(ring);
1251 int state = interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE;
1253 unsigned long timeout_expire;
1257 WARN(!intel_irqs_enabled(dev_priv), "IRQs disabled");
1259 if (list_empty(&req->list))
1262 if (i915_gem_request_completed(req, true))
1267 if (WARN_ON(*timeout < 0))
1273 timeout_expire = jiffies + nsecs_to_jiffies_timeout(*timeout);
1276 if (INTEL_INFO(dev_priv)->gen >= 6)
1277 gen6_rps_boost(dev_priv, rps, req->emitted_jiffies);
1279 /* Record current time in case interrupted by signal, or wedged */
1280 trace_i915_gem_request_wait_begin(req);
1281 before = ktime_get_raw_ns();
1283 /* Optimistic spin for the next jiffie before touching IRQs */
1284 ret = __i915_spin_request(req, state);
1288 if (!irq_test_in_progress && WARN_ON(!ring->irq_get(ring))) {
1294 struct timer_list timer;
1296 prepare_to_wait(&ring->irq_queue, &wait, state);
1298 /* We need to check whether any gpu reset happened in between
1299 * the caller grabbing the seqno and now ... */
1300 if (reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter)) {
1301 /* ... but upgrade the -EAGAIN to an -EIO if the gpu
1302 * is truely gone. */
1303 ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
1309 if (i915_gem_request_completed(req, false)) {
1314 if (signal_pending_state(state, current)) {
1319 if (timeout && time_after_eq(jiffies, timeout_expire)) {
1324 timer.function = NULL;
1325 if (timeout || missed_irq(dev_priv, ring)) {
1326 unsigned long expire;
1328 setup_timer_on_stack(&timer, fake_irq, (unsigned long)current);
1329 expire = missed_irq(dev_priv, ring) ? jiffies + 1 : timeout_expire;
1330 mod_timer(&timer, expire);
1335 if (timer.function) {
1336 del_singleshot_timer_sync(&timer);
1337 destroy_timer_on_stack(&timer);
1340 if (!irq_test_in_progress)
1341 ring->irq_put(ring);
1343 finish_wait(&ring->irq_queue, &wait);
1346 now = ktime_get_raw_ns();
1347 trace_i915_gem_request_wait_end(req);
1350 s64 tres = *timeout - (now - before);
1352 *timeout = tres < 0 ? 0 : tres;
1355 * Apparently ktime isn't accurate enough and occasionally has a
1356 * bit of mismatch in the jiffies<->nsecs<->ktime loop. So patch
1357 * things up to make the test happy. We allow up to 1 jiffy.
1359 * This is a regrssion from the timespec->ktime conversion.
1361 if (ret == -ETIME && *timeout < jiffies_to_usecs(1)*1000)
1368 int i915_gem_request_add_to_client(struct drm_i915_gem_request *req,
1369 struct drm_file *file)
1371 struct drm_i915_private *dev_private;
1372 struct drm_i915_file_private *file_priv;
1374 WARN_ON(!req || !file || req->file_priv);
1382 dev_private = req->ring->dev->dev_private;
1383 file_priv = file->driver_priv;
1385 spin_lock(&file_priv->mm.lock);
1386 req->file_priv = file_priv;
1387 list_add_tail(&req->client_list, &file_priv->mm.request_list);
1388 spin_unlock(&file_priv->mm.lock);
1390 req->pid = get_pid(task_pid(current));
1396 i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
1398 struct drm_i915_file_private *file_priv = request->file_priv;
1403 spin_lock(&file_priv->mm.lock);
1404 list_del(&request->client_list);
1405 request->file_priv = NULL;
1406 spin_unlock(&file_priv->mm.lock);
1408 put_pid(request->pid);
1409 request->pid = NULL;
1412 static void i915_gem_request_retire(struct drm_i915_gem_request *request)
1414 trace_i915_gem_request_retire(request);
1416 /* We know the GPU must have read the request to have
1417 * sent us the seqno + interrupt, so use the position
1418 * of tail of the request to update the last known position
1421 * Note this requires that we are always called in request
1424 request->ringbuf->last_retired_head = request->postfix;
1426 list_del_init(&request->list);
1427 i915_gem_request_remove_from_client(request);
1429 i915_gem_request_unreference(request);
1433 __i915_gem_request_retire__upto(struct drm_i915_gem_request *req)
1435 struct intel_engine_cs *engine = req->ring;
1436 struct drm_i915_gem_request *tmp;
1438 lockdep_assert_held(&engine->dev->struct_mutex);
1440 if (list_empty(&req->list))
1444 tmp = list_first_entry(&engine->request_list,
1445 typeof(*tmp), list);
1447 i915_gem_request_retire(tmp);
1448 } while (tmp != req);
1450 WARN_ON(i915_verify_lists(engine->dev));
1454 * Waits for a request to be signaled, and cleans up the
1455 * request and object lists appropriately for that event.
1458 i915_wait_request(struct drm_i915_gem_request *req)
1460 struct drm_device *dev;
1461 struct drm_i915_private *dev_priv;
1465 BUG_ON(req == NULL);
1467 dev = req->ring->dev;
1468 dev_priv = dev->dev_private;
1469 interruptible = dev_priv->mm.interruptible;
1471 BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1473 ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
1477 ret = __i915_wait_request(req,
1478 atomic_read(&dev_priv->gpu_error.reset_counter),
1479 interruptible, NULL, NULL);
1483 __i915_gem_request_retire__upto(req);
1488 * Ensures that all rendering to the object has completed and the object is
1489 * safe to unbind from the GTT or access from the CPU.
1492 i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
1501 if (obj->last_write_req != NULL) {
1502 ret = i915_wait_request(obj->last_write_req);
1506 i = obj->last_write_req->ring->id;
1507 if (obj->last_read_req[i] == obj->last_write_req)
1508 i915_gem_object_retire__read(obj, i);
1510 i915_gem_object_retire__write(obj);
1513 for (i = 0; i < I915_NUM_RINGS; i++) {
1514 if (obj->last_read_req[i] == NULL)
1517 ret = i915_wait_request(obj->last_read_req[i]);
1521 i915_gem_object_retire__read(obj, i);
1523 RQ_BUG_ON(obj->active);
1530 i915_gem_object_retire_request(struct drm_i915_gem_object *obj,
1531 struct drm_i915_gem_request *req)
1533 int ring = req->ring->id;
1535 if (obj->last_read_req[ring] == req)
1536 i915_gem_object_retire__read(obj, ring);
1537 else if (obj->last_write_req == req)
1538 i915_gem_object_retire__write(obj);
1540 __i915_gem_request_retire__upto(req);
1543 /* A nonblocking variant of the above wait. This is a highly dangerous routine
1544 * as the object state may change during this call.
1546 static __must_check int
1547 i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
1548 struct intel_rps_client *rps,
1551 struct drm_device *dev = obj->base.dev;
1552 struct drm_i915_private *dev_priv = dev->dev_private;
1553 struct drm_i915_gem_request *requests[I915_NUM_RINGS];
1554 unsigned reset_counter;
1557 BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1558 BUG_ON(!dev_priv->mm.interruptible);
1563 ret = i915_gem_check_wedge(&dev_priv->gpu_error, true);
1567 reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
1570 struct drm_i915_gem_request *req;
1572 req = obj->last_write_req;
1576 requests[n++] = i915_gem_request_reference(req);
1578 for (i = 0; i < I915_NUM_RINGS; i++) {
1579 struct drm_i915_gem_request *req;
1581 req = obj->last_read_req[i];
1585 requests[n++] = i915_gem_request_reference(req);
1589 mutex_unlock(&dev->struct_mutex);
1590 for (i = 0; ret == 0 && i < n; i++)
1591 ret = __i915_wait_request(requests[i], reset_counter, true,
1593 mutex_lock(&dev->struct_mutex);
1595 for (i = 0; i < n; i++) {
1597 i915_gem_object_retire_request(obj, requests[i]);
1598 i915_gem_request_unreference(requests[i]);
1604 static struct intel_rps_client *to_rps_client(struct drm_file *file)
1606 struct drm_i915_file_private *fpriv = file->driver_priv;
1611 * Called when user space prepares to use an object with the CPU, either
1612 * through the mmap ioctl's mapping or a GTT mapping.
1615 i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
1616 struct drm_file *file)
1618 struct drm_i915_gem_set_domain *args = data;
1619 struct drm_i915_gem_object *obj;
1620 uint32_t read_domains = args->read_domains;
1621 uint32_t write_domain = args->write_domain;
1624 /* Only handle setting domains to types used by the CPU. */
1625 if (write_domain & I915_GEM_GPU_DOMAINS)
1628 if (read_domains & I915_GEM_GPU_DOMAINS)
1631 /* Having something in the write domain implies it's in the read
1632 * domain, and only that read domain. Enforce that in the request.
1634 if (write_domain != 0 && read_domains != write_domain)
1637 ret = i915_mutex_lock_interruptible(dev);
1641 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1642 if (&obj->base == NULL) {
1647 /* Try to flush the object off the GPU without holding the lock.
1648 * We will repeat the flush holding the lock in the normal manner
1649 * to catch cases where we are gazumped.
1651 ret = i915_gem_object_wait_rendering__nonblocking(obj,
1652 to_rps_client(file),
1657 if (read_domains & I915_GEM_DOMAIN_GTT)
1658 ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0);
1660 ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0);
1662 if (write_domain != 0)
1663 intel_fb_obj_invalidate(obj,
1664 write_domain == I915_GEM_DOMAIN_GTT ?
1665 ORIGIN_GTT : ORIGIN_CPU);
1668 drm_gem_object_unreference(&obj->base);
1670 mutex_unlock(&dev->struct_mutex);
1675 * Called when user space has done writes to this buffer
1678 i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
1679 struct drm_file *file)
1681 struct drm_i915_gem_sw_finish *args = data;
1682 struct drm_i915_gem_object *obj;
1685 ret = i915_mutex_lock_interruptible(dev);
1689 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1690 if (&obj->base == NULL) {
1695 /* Pinned buffers may be scanout, so flush the cache */
1696 if (obj->pin_display)
1697 i915_gem_object_flush_cpu_write_domain(obj);
1699 drm_gem_object_unreference(&obj->base);
1701 mutex_unlock(&dev->struct_mutex);
1706 * Maps the contents of an object, returning the address it is mapped
1709 * While the mapping holds a reference on the contents of the object, it doesn't
1710 * imply a ref on the object itself.
1714 * DRM driver writers who look a this function as an example for how to do GEM
1715 * mmap support, please don't implement mmap support like here. The modern way
1716 * to implement DRM mmap support is with an mmap offset ioctl (like
1717 * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly.
1718 * That way debug tooling like valgrind will understand what's going on, hiding
1719 * the mmap call in a driver private ioctl will break that. The i915 driver only
1720 * does cpu mmaps this way because we didn't know better.
1723 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
1724 struct drm_file *file)
1726 struct drm_i915_gem_mmap *args = data;
1727 struct drm_gem_object *obj;
1730 if (args->flags & ~(I915_MMAP_WC))
1733 if (args->flags & I915_MMAP_WC && !cpu_has_pat)
1736 obj = drm_gem_object_lookup(dev, file, args->handle);
1740 /* prime objects have no backing filp to GEM mmap
1744 drm_gem_object_unreference_unlocked(obj);
1748 addr = vm_mmap(obj->filp, 0, args->size,
1749 PROT_READ | PROT_WRITE, MAP_SHARED,
1751 if (args->flags & I915_MMAP_WC) {
1752 struct mm_struct *mm = current->mm;
1753 struct vm_area_struct *vma;
1755 down_write(&mm->mmap_sem);
1756 vma = find_vma(mm, addr);
1759 pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
1762 up_write(&mm->mmap_sem);
1764 drm_gem_object_unreference_unlocked(obj);
1765 if (IS_ERR((void *)addr))
1768 args->addr_ptr = (uint64_t) addr;
1774 * i915_gem_fault - fault a page into the GTT
1775 * @vma: VMA in question
1778 * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
1779 * from userspace. The fault handler takes care of binding the object to
1780 * the GTT (if needed), allocating and programming a fence register (again,
1781 * only if needed based on whether the old reg is still valid or the object
1782 * is tiled) and inserting a new PTE into the faulting process.
1784 * Note that the faulting process may involve evicting existing objects
1785 * from the GTT and/or fence registers to make room. So performance may
1786 * suffer if the GTT working set is large or there are few fence registers
1789 int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1791 struct drm_i915_gem_object *obj = to_intel_bo(vma->vm_private_data);
1792 struct drm_device *dev = obj->base.dev;
1793 struct drm_i915_private *dev_priv = dev->dev_private;
1794 struct i915_ggtt_view view = i915_ggtt_view_normal;
1795 pgoff_t page_offset;
1798 bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
1800 intel_runtime_pm_get(dev_priv);
1802 /* We don't use vmf->pgoff since that has the fake offset */
1803 page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
1806 ret = i915_mutex_lock_interruptible(dev);
1810 trace_i915_gem_object_fault(obj, page_offset, true, write);
1812 /* Try to flush the object off the GPU first without holding the lock.
1813 * Upon reacquiring the lock, we will perform our sanity checks and then
1814 * repeat the flush holding the lock in the normal manner to catch cases
1815 * where we are gazumped.
1817 ret = i915_gem_object_wait_rendering__nonblocking(obj, NULL, !write);
1821 /* Access to snoopable pages through the GTT is incoherent. */
1822 if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev)) {
1827 /* Use a partial view if the object is bigger than the aperture. */
1828 if (obj->base.size >= dev_priv->gtt.mappable_end &&
1829 obj->tiling_mode == I915_TILING_NONE) {
1830 static const unsigned int chunk_size = 256; // 1 MiB
1832 memset(&view, 0, sizeof(view));
1833 view.type = I915_GGTT_VIEW_PARTIAL;
1834 view.params.partial.offset = rounddown(page_offset, chunk_size);
1835 view.params.partial.size =
1838 (vma->vm_end - vma->vm_start)/PAGE_SIZE -
1839 view.params.partial.offset);
1842 /* Now pin it into the GTT if needed */
1843 ret = i915_gem_object_ggtt_pin(obj, &view, 0, PIN_MAPPABLE);
1847 ret = i915_gem_object_set_to_gtt_domain(obj, write);
1851 ret = i915_gem_object_get_fence(obj);
1855 /* Finally, remap it using the new GTT offset */
1856 pfn = dev_priv->gtt.mappable_base +
1857 i915_gem_obj_ggtt_offset_view(obj, &view);
1860 if (unlikely(view.type == I915_GGTT_VIEW_PARTIAL)) {
1861 /* Overriding existing pages in partial view does not cause
1862 * us any trouble as TLBs are still valid because the fault
1863 * is due to userspace losing part of the mapping or never
1864 * having accessed it before (at this partials' range).
1866 unsigned long base = vma->vm_start +
1867 (view.params.partial.offset << PAGE_SHIFT);
1870 for (i = 0; i < view.params.partial.size; i++) {
1871 ret = vm_insert_pfn(vma, base + i * PAGE_SIZE, pfn + i);
1876 obj->fault_mappable = true;
1878 if (!obj->fault_mappable) {
1879 unsigned long size = min_t(unsigned long,
1880 vma->vm_end - vma->vm_start,
1884 for (i = 0; i < size >> PAGE_SHIFT; i++) {
1885 ret = vm_insert_pfn(vma,
1886 (unsigned long)vma->vm_start + i * PAGE_SIZE,
1892 obj->fault_mappable = true;
1894 ret = vm_insert_pfn(vma,
1895 (unsigned long)vmf->virtual_address,
1899 i915_gem_object_ggtt_unpin_view(obj, &view);
1901 mutex_unlock(&dev->struct_mutex);
1906 * We eat errors when the gpu is terminally wedged to avoid
1907 * userspace unduly crashing (gl has no provisions for mmaps to
1908 * fail). But any other -EIO isn't ours (e.g. swap in failure)
1909 * and so needs to be reported.
1911 if (!i915_terminally_wedged(&dev_priv->gpu_error)) {
1912 ret = VM_FAULT_SIGBUS;
1917 * EAGAIN means the gpu is hung and we'll wait for the error
1918 * handler to reset everything when re-faulting in
1919 * i915_mutex_lock_interruptible.
1926 * EBUSY is ok: this just means that another thread
1927 * already did the job.
1929 ret = VM_FAULT_NOPAGE;
1936 ret = VM_FAULT_SIGBUS;
1939 WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret);
1940 ret = VM_FAULT_SIGBUS;
1944 intel_runtime_pm_put(dev_priv);
1949 * i915_gem_release_mmap - remove physical page mappings
1950 * @obj: obj in question
1952 * Preserve the reservation of the mmapping with the DRM core code, but
1953 * relinquish ownership of the pages back to the system.
1955 * It is vital that we remove the page mapping if we have mapped a tiled
1956 * object through the GTT and then lose the fence register due to
1957 * resource pressure. Similarly if the object has been moved out of the
1958 * aperture, than pages mapped into userspace must be revoked. Removing the
1959 * mapping will then trigger a page fault on the next user access, allowing
1960 * fixup by i915_gem_fault().
1963 i915_gem_release_mmap(struct drm_i915_gem_object *obj)
1965 if (!obj->fault_mappable)
1968 drm_vma_node_unmap(&obj->base.vma_node,
1969 obj->base.dev->anon_inode->i_mapping);
1970 obj->fault_mappable = false;
1974 i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv)
1976 struct drm_i915_gem_object *obj;
1978 list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)
1979 i915_gem_release_mmap(obj);
1983 i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode)
1987 if (INTEL_INFO(dev)->gen >= 4 ||
1988 tiling_mode == I915_TILING_NONE)
1991 /* Previous chips need a power-of-two fence region when tiling */
1992 if (INTEL_INFO(dev)->gen == 3)
1993 gtt_size = 1024*1024;
1995 gtt_size = 512*1024;
1997 while (gtt_size < size)
2004 * i915_gem_get_gtt_alignment - return required GTT alignment for an object
2005 * @obj: object to check
2007 * Return the required GTT alignment for an object, taking into account
2008 * potential fence register mapping.
2011 i915_gem_get_gtt_alignment(struct drm_device *dev, uint32_t size,
2012 int tiling_mode, bool fenced)
2015 * Minimum alignment is 4k (GTT page size), but might be greater
2016 * if a fence register is needed for the object.
2018 if (INTEL_INFO(dev)->gen >= 4 || (!fenced && IS_G33(dev)) ||
2019 tiling_mode == I915_TILING_NONE)
2023 * Previous chips need to be aligned to the size of the smallest
2024 * fence register that can contain the object.
2026 return i915_gem_get_gtt_size(dev, size, tiling_mode);
2029 static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
2031 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2034 if (drm_vma_node_has_offset(&obj->base.vma_node))
2037 dev_priv->mm.shrinker_no_lock_stealing = true;
2039 ret = drm_gem_create_mmap_offset(&obj->base);
2043 /* Badly fragmented mmap space? The only way we can recover
2044 * space is by destroying unwanted objects. We can't randomly release
2045 * mmap_offsets as userspace expects them to be persistent for the
2046 * lifetime of the objects. The closest we can is to release the
2047 * offsets on purgeable objects by truncating it and marking it purged,
2048 * which prevents userspace from ever using that object again.
2050 i915_gem_shrink(dev_priv,
2051 obj->base.size >> PAGE_SHIFT,
2053 I915_SHRINK_UNBOUND |
2054 I915_SHRINK_PURGEABLE);
2055 ret = drm_gem_create_mmap_offset(&obj->base);
2059 i915_gem_shrink_all(dev_priv);
2060 ret = drm_gem_create_mmap_offset(&obj->base);
2062 dev_priv->mm.shrinker_no_lock_stealing = false;
2067 static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj)
2069 drm_gem_free_mmap_offset(&obj->base);
2073 i915_gem_mmap_gtt(struct drm_file *file,
2074 struct drm_device *dev,
2078 struct drm_i915_gem_object *obj;
2081 ret = i915_mutex_lock_interruptible(dev);
2085 obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
2086 if (&obj->base == NULL) {
2091 if (obj->madv != I915_MADV_WILLNEED) {
2092 DRM_DEBUG("Attempting to mmap a purgeable buffer\n");
2097 ret = i915_gem_object_create_mmap_offset(obj);
2101 *offset = drm_vma_node_offset_addr(&obj->base.vma_node);
2104 drm_gem_object_unreference(&obj->base);
2106 mutex_unlock(&dev->struct_mutex);
2111 * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
2113 * @data: GTT mapping ioctl data
2114 * @file: GEM object info
2116 * Simply returns the fake offset to userspace so it can mmap it.
2117 * The mmap call will end up in drm_gem_mmap(), which will set things
2118 * up so we can get faults in the handler above.
2120 * The fault handler will take care of binding the object into the GTT
2121 * (since it may have been evicted to make room for something), allocating
2122 * a fence register, and mapping the appropriate aperture address into
2126 i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
2127 struct drm_file *file)
2129 struct drm_i915_gem_mmap_gtt *args = data;
2131 return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
2134 /* Immediately discard the backing storage */
2136 i915_gem_object_truncate(struct drm_i915_gem_object *obj)
2138 i915_gem_object_free_mmap_offset(obj);
2140 if (obj->base.filp == NULL)
2143 /* Our goal here is to return as much of the memory as
2144 * is possible back to the system as we are called from OOM.
2145 * To do this we must instruct the shmfs to drop all of its
2146 * backing pages, *now*.
2148 shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1);
2149 obj->madv = __I915_MADV_PURGED;
2152 /* Try to discard unwanted pages */
2154 i915_gem_object_invalidate(struct drm_i915_gem_object *obj)
2156 struct address_space *mapping;
2158 switch (obj->madv) {
2159 case I915_MADV_DONTNEED:
2160 i915_gem_object_truncate(obj);
2161 case __I915_MADV_PURGED:
2165 if (obj->base.filp == NULL)
2168 mapping = file_inode(obj->base.filp)->i_mapping,
2169 invalidate_mapping_pages(mapping, 0, (loff_t)-1);
2173 i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj)
2175 struct sg_page_iter sg_iter;
2178 BUG_ON(obj->madv == __I915_MADV_PURGED);
2180 ret = i915_gem_object_set_to_cpu_domain(obj, true);
2182 /* In the event of a disaster, abandon all caches and
2183 * hope for the best.
2185 WARN_ON(ret != -EIO);
2186 i915_gem_clflush_object(obj, true);
2187 obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU;
2190 i915_gem_gtt_finish_object(obj);
2192 if (i915_gem_object_needs_bit17_swizzle(obj))
2193 i915_gem_object_save_bit_17_swizzle(obj);
2195 if (obj->madv == I915_MADV_DONTNEED)
2198 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) {
2199 struct page *page = sg_page_iter_page(&sg_iter);
2202 set_page_dirty(page);
2204 if (obj->madv == I915_MADV_WILLNEED)
2205 mark_page_accessed(page);
2207 page_cache_release(page);
2211 sg_free_table(obj->pages);
2216 i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
2218 const struct drm_i915_gem_object_ops *ops = obj->ops;
2220 if (obj->pages == NULL)
2223 if (obj->pages_pin_count)
2226 BUG_ON(i915_gem_obj_bound_any(obj));
2228 /* ->put_pages might need to allocate memory for the bit17 swizzle
2229 * array, hence protect them from being reaped by removing them from gtt
2231 list_del(&obj->global_list);
2233 ops->put_pages(obj);
2236 i915_gem_object_invalidate(obj);
2242 i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
2244 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2246 struct address_space *mapping;
2247 struct sg_table *st;
2248 struct scatterlist *sg;
2249 struct sg_page_iter sg_iter;
2251 unsigned long last_pfn = 0; /* suppress gcc warning */
2255 /* Assert that the object is not currently in any GPU domain. As it
2256 * wasn't in the GTT, there shouldn't be any way it could have been in
2259 BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
2260 BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
2262 st = kmalloc(sizeof(*st), GFP_KERNEL);
2266 page_count = obj->base.size / PAGE_SIZE;
2267 if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
2272 /* Get the list of pages out of our struct file. They'll be pinned
2273 * at this point until we release them.
2275 * Fail silently without starting the shrinker
2277 mapping = file_inode(obj->base.filp)->i_mapping;
2278 gfp = mapping_gfp_constraint(mapping, ~(__GFP_IO | __GFP_RECLAIM));
2279 gfp |= __GFP_NORETRY | __GFP_NOWARN;
2282 for (i = 0; i < page_count; i++) {
2283 page = shmem_read_mapping_page_gfp(mapping, i, gfp);
2285 i915_gem_shrink(dev_priv,
2288 I915_SHRINK_UNBOUND |
2289 I915_SHRINK_PURGEABLE);
2290 page = shmem_read_mapping_page_gfp(mapping, i, gfp);
2293 /* We've tried hard to allocate the memory by reaping
2294 * our own buffer, now let the real VM do its job and
2295 * go down in flames if truly OOM.
2297 i915_gem_shrink_all(dev_priv);
2298 page = shmem_read_mapping_page(mapping, i);
2300 ret = PTR_ERR(page);
2304 #ifdef CONFIG_SWIOTLB
2305 if (swiotlb_nr_tbl()) {
2307 sg_set_page(sg, page, PAGE_SIZE, 0);
2312 if (!i || page_to_pfn(page) != last_pfn + 1) {
2316 sg_set_page(sg, page, PAGE_SIZE, 0);
2318 sg->length += PAGE_SIZE;
2320 last_pfn = page_to_pfn(page);
2322 /* Check that the i965g/gm workaround works. */
2323 WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL));
2325 #ifdef CONFIG_SWIOTLB
2326 if (!swiotlb_nr_tbl())
2331 ret = i915_gem_gtt_prepare_object(obj);
2335 if (i915_gem_object_needs_bit17_swizzle(obj))
2336 i915_gem_object_do_bit_17_swizzle(obj);
2338 if (obj->tiling_mode != I915_TILING_NONE &&
2339 dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES)
2340 i915_gem_object_pin_pages(obj);
2346 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
2347 page_cache_release(sg_page_iter_page(&sg_iter));
2351 /* shmemfs first checks if there is enough memory to allocate the page
2352 * and reports ENOSPC should there be insufficient, along with the usual
2353 * ENOMEM for a genuine allocation failure.
2355 * We use ENOSPC in our driver to mean that we have run out of aperture
2356 * space and so want to translate the error from shmemfs back to our
2357 * usual understanding of ENOMEM.
2365 /* Ensure that the associated pages are gathered from the backing storage
2366 * and pinned into our object. i915_gem_object_get_pages() may be called
2367 * multiple times before they are released by a single call to
2368 * i915_gem_object_put_pages() - once the pages are no longer referenced
2369 * either as a result of memory pressure (reaping pages under the shrinker)
2370 * or as the object is itself released.
2373 i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
2375 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2376 const struct drm_i915_gem_object_ops *ops = obj->ops;
2382 if (obj->madv != I915_MADV_WILLNEED) {
2383 DRM_DEBUG("Attempting to obtain a purgeable object\n");
2387 BUG_ON(obj->pages_pin_count);
2389 ret = ops->get_pages(obj);
2393 list_add_tail(&obj->global_list, &dev_priv->mm.unbound_list);
2395 obj->get_page.sg = obj->pages->sgl;
2396 obj->get_page.last = 0;
2401 void i915_vma_move_to_active(struct i915_vma *vma,
2402 struct drm_i915_gem_request *req)
2404 struct drm_i915_gem_object *obj = vma->obj;
2405 struct intel_engine_cs *ring;
2407 ring = i915_gem_request_get_ring(req);
2409 /* Add a reference if we're newly entering the active list. */
2410 if (obj->active == 0)
2411 drm_gem_object_reference(&obj->base);
2412 obj->active |= intel_ring_flag(ring);
2414 list_move_tail(&obj->ring_list[ring->id], &ring->active_list);
2415 i915_gem_request_assign(&obj->last_read_req[ring->id], req);
2417 list_move_tail(&vma->mm_list, &vma->vm->active_list);
2421 i915_gem_object_retire__write(struct drm_i915_gem_object *obj)
2423 RQ_BUG_ON(obj->last_write_req == NULL);
2424 RQ_BUG_ON(!(obj->active & intel_ring_flag(obj->last_write_req->ring)));
2426 i915_gem_request_assign(&obj->last_write_req, NULL);
2427 intel_fb_obj_flush(obj, true, ORIGIN_CS);
2431 i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring)
2433 struct i915_vma *vma;
2435 RQ_BUG_ON(obj->last_read_req[ring] == NULL);
2436 RQ_BUG_ON(!(obj->active & (1 << ring)));
2438 list_del_init(&obj->ring_list[ring]);
2439 i915_gem_request_assign(&obj->last_read_req[ring], NULL);
2441 if (obj->last_write_req && obj->last_write_req->ring->id == ring)
2442 i915_gem_object_retire__write(obj);
2444 obj->active &= ~(1 << ring);
2448 /* Bump our place on the bound list to keep it roughly in LRU order
2449 * so that we don't steal from recently used but inactive objects
2450 * (unless we are forced to ofc!)
2452 list_move_tail(&obj->global_list,
2453 &to_i915(obj->base.dev)->mm.bound_list);
2455 list_for_each_entry(vma, &obj->vma_list, vma_link) {
2456 if (!list_empty(&vma->mm_list))
2457 list_move_tail(&vma->mm_list, &vma->vm->inactive_list);
2460 i915_gem_request_assign(&obj->last_fenced_req, NULL);
2461 drm_gem_object_unreference(&obj->base);
2465 i915_gem_init_seqno(struct drm_device *dev, u32 seqno)
2467 struct drm_i915_private *dev_priv = dev->dev_private;
2468 struct intel_engine_cs *ring;
2471 /* Carefully retire all requests without writing to the rings */
2472 for_each_ring(ring, dev_priv, i) {
2473 ret = intel_ring_idle(ring);
2477 i915_gem_retire_requests(dev);
2479 /* Finally reset hw state */
2480 for_each_ring(ring, dev_priv, i) {
2481 intel_ring_init_seqno(ring, seqno);
2483 for (j = 0; j < ARRAY_SIZE(ring->semaphore.sync_seqno); j++)
2484 ring->semaphore.sync_seqno[j] = 0;
2490 int i915_gem_set_seqno(struct drm_device *dev, u32 seqno)
2492 struct drm_i915_private *dev_priv = dev->dev_private;
2498 /* HWS page needs to be set less than what we
2499 * will inject to ring
2501 ret = i915_gem_init_seqno(dev, seqno - 1);
2505 /* Carefully set the last_seqno value so that wrap
2506 * detection still works
2508 dev_priv->next_seqno = seqno;
2509 dev_priv->last_seqno = seqno - 1;
2510 if (dev_priv->last_seqno == 0)
2511 dev_priv->last_seqno--;
2517 i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
2519 struct drm_i915_private *dev_priv = dev->dev_private;
2521 /* reserve 0 for non-seqno */
2522 if (dev_priv->next_seqno == 0) {
2523 int ret = i915_gem_init_seqno(dev, 0);
2527 dev_priv->next_seqno = 1;
2530 *seqno = dev_priv->last_seqno = dev_priv->next_seqno++;
2535 * NB: This function is not allowed to fail. Doing so would mean the the
2536 * request is not being tracked for completion but the work itself is
2537 * going to happen on the hardware. This would be a Bad Thing(tm).
2539 void __i915_add_request(struct drm_i915_gem_request *request,
2540 struct drm_i915_gem_object *obj,
2543 struct intel_engine_cs *ring;
2544 struct drm_i915_private *dev_priv;
2545 struct intel_ringbuffer *ringbuf;
2549 if (WARN_ON(request == NULL))
2552 ring = request->ring;
2553 dev_priv = ring->dev->dev_private;
2554 ringbuf = request->ringbuf;
2557 * To ensure that this call will not fail, space for its emissions
2558 * should already have been reserved in the ring buffer. Let the ring
2559 * know that it is time to use that space up.
2561 intel_ring_reserved_space_use(ringbuf);
2563 request_start = intel_ring_get_tail(ringbuf);
2565 * Emit any outstanding flushes - execbuf can fail to emit the flush
2566 * after having emitted the batchbuffer command. Hence we need to fix
2567 * things up similar to emitting the lazy request. The difference here
2568 * is that the flush _must_ happen before the next request, no matter
2572 if (i915.enable_execlists)
2573 ret = logical_ring_flush_all_caches(request);
2575 ret = intel_ring_flush_all_caches(request);
2576 /* Not allowed to fail! */
2577 WARN(ret, "*_ring_flush_all_caches failed: %d!\n", ret);
2580 /* Record the position of the start of the request so that
2581 * should we detect the updated seqno part-way through the
2582 * GPU processing the request, we never over-estimate the
2583 * position of the head.
2585 request->postfix = intel_ring_get_tail(ringbuf);
2587 if (i915.enable_execlists)
2588 ret = ring->emit_request(request);
2590 ret = ring->add_request(request);
2592 request->tail = intel_ring_get_tail(ringbuf);
2594 /* Not allowed to fail! */
2595 WARN(ret, "emit|add_request failed: %d!\n", ret);
2597 request->head = request_start;
2599 /* Whilst this request exists, batch_obj will be on the
2600 * active_list, and so will hold the active reference. Only when this
2601 * request is retired will the the batch_obj be moved onto the
2602 * inactive_list and lose its active reference. Hence we do not need
2603 * to explicitly hold another reference here.
2605 request->batch_obj = obj;
2607 request->emitted_jiffies = jiffies;
2608 request->previous_seqno = ring->last_submitted_seqno;
2609 ring->last_submitted_seqno = request->seqno;
2610 list_add_tail(&request->list, &ring->request_list);
2612 trace_i915_gem_request_add(request);
2614 i915_queue_hangcheck(ring->dev);
2616 queue_delayed_work(dev_priv->wq,
2617 &dev_priv->mm.retire_work,
2618 round_jiffies_up_relative(HZ));
2619 intel_mark_busy(dev_priv->dev);
2621 /* Sanity check that the reserved size was large enough. */
2622 intel_ring_reserved_space_end(ringbuf);
2625 static bool i915_context_is_banned(struct drm_i915_private *dev_priv,
2626 const struct intel_context *ctx)
2628 unsigned long elapsed;
2630 elapsed = get_seconds() - ctx->hang_stats.guilty_ts;
2632 if (ctx->hang_stats.banned)
2635 if (ctx->hang_stats.ban_period_seconds &&
2636 elapsed <= ctx->hang_stats.ban_period_seconds) {
2637 if (!i915_gem_context_is_default(ctx)) {
2638 DRM_DEBUG("context hanging too fast, banning!\n");
2640 } else if (i915_stop_ring_allow_ban(dev_priv)) {
2641 if (i915_stop_ring_allow_warn(dev_priv))
2642 DRM_ERROR("gpu hanging too fast, banning!\n");
2650 static void i915_set_reset_status(struct drm_i915_private *dev_priv,
2651 struct intel_context *ctx,
2654 struct i915_ctx_hang_stats *hs;
2659 hs = &ctx->hang_stats;
2662 hs->banned = i915_context_is_banned(dev_priv, ctx);
2664 hs->guilty_ts = get_seconds();
2666 hs->batch_pending++;
2670 void i915_gem_request_free(struct kref *req_ref)
2672 struct drm_i915_gem_request *req = container_of(req_ref,
2674 struct intel_context *ctx = req->ctx;
2677 i915_gem_request_remove_from_client(req);
2680 if (i915.enable_execlists) {
2681 if (ctx != req->ring->default_context)
2682 intel_lr_context_unpin(req);
2685 i915_gem_context_unreference(ctx);
2688 kmem_cache_free(req->i915->requests, req);
2691 int i915_gem_request_alloc(struct intel_engine_cs *ring,
2692 struct intel_context *ctx,
2693 struct drm_i915_gem_request **req_out)
2695 struct drm_i915_private *dev_priv = to_i915(ring->dev);
2696 struct drm_i915_gem_request *req;
2704 req = kmem_cache_zalloc(dev_priv->requests, GFP_KERNEL);
2708 ret = i915_gem_get_seqno(ring->dev, &req->seqno);
2712 kref_init(&req->ref);
2713 req->i915 = dev_priv;
2716 i915_gem_context_reference(req->ctx);
2718 if (i915.enable_execlists)
2719 ret = intel_logical_ring_alloc_request_extras(req);
2721 ret = intel_ring_alloc_request_extras(req);
2723 i915_gem_context_unreference(req->ctx);
2728 * Reserve space in the ring buffer for all the commands required to
2729 * eventually emit this request. This is to guarantee that the
2730 * i915_add_request() call can't fail. Note that the reserve may need
2731 * to be redone if the request is not actually submitted straight
2732 * away, e.g. because a GPU scheduler has deferred it.
2734 if (i915.enable_execlists)
2735 ret = intel_logical_ring_reserve_space(req);
2737 ret = intel_ring_reserve_space(req);
2740 * At this point, the request is fully allocated even if not
2741 * fully prepared. Thus it can be cleaned up using the proper
2744 i915_gem_request_cancel(req);
2752 kmem_cache_free(dev_priv->requests, req);
2756 void i915_gem_request_cancel(struct drm_i915_gem_request *req)
2758 intel_ring_reserved_space_cancel(req->ringbuf);
2760 i915_gem_request_unreference(req);
2763 struct drm_i915_gem_request *
2764 i915_gem_find_active_request(struct intel_engine_cs *ring)
2766 struct drm_i915_gem_request *request;
2768 list_for_each_entry(request, &ring->request_list, list) {
2769 if (i915_gem_request_completed(request, false))
2778 static void i915_gem_reset_ring_status(struct drm_i915_private *dev_priv,
2779 struct intel_engine_cs *ring)
2781 struct drm_i915_gem_request *request;
2784 request = i915_gem_find_active_request(ring);
2786 if (request == NULL)
2789 ring_hung = ring->hangcheck.score >= HANGCHECK_SCORE_RING_HUNG;
2791 i915_set_reset_status(dev_priv, request->ctx, ring_hung);
2793 list_for_each_entry_continue(request, &ring->request_list, list)
2794 i915_set_reset_status(dev_priv, request->ctx, false);
2797 static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
2798 struct intel_engine_cs *ring)
2800 while (!list_empty(&ring->active_list)) {
2801 struct drm_i915_gem_object *obj;
2803 obj = list_first_entry(&ring->active_list,
2804 struct drm_i915_gem_object,
2805 ring_list[ring->id]);
2807 i915_gem_object_retire__read(obj, ring->id);
2811 * Clear the execlists queue up before freeing the requests, as those
2812 * are the ones that keep the context and ringbuffer backing objects
2815 while (!list_empty(&ring->execlist_queue)) {
2816 struct drm_i915_gem_request *submit_req;
2818 submit_req = list_first_entry(&ring->execlist_queue,
2819 struct drm_i915_gem_request,
2821 list_del(&submit_req->execlist_link);
2823 if (submit_req->ctx != ring->default_context)
2824 intel_lr_context_unpin(submit_req);
2826 i915_gem_request_unreference(submit_req);
2830 * We must free the requests after all the corresponding objects have
2831 * been moved off active lists. Which is the same order as the normal
2832 * retire_requests function does. This is important if object hold
2833 * implicit references on things like e.g. ppgtt address spaces through
2836 while (!list_empty(&ring->request_list)) {
2837 struct drm_i915_gem_request *request;
2839 request = list_first_entry(&ring->request_list,
2840 struct drm_i915_gem_request,
2843 i915_gem_request_retire(request);
2847 void i915_gem_reset(struct drm_device *dev)
2849 struct drm_i915_private *dev_priv = dev->dev_private;
2850 struct intel_engine_cs *ring;
2854 * Before we free the objects from the requests, we need to inspect
2855 * them for finding the guilty party. As the requests only borrow
2856 * their reference to the objects, the inspection must be done first.
2858 for_each_ring(ring, dev_priv, i)
2859 i915_gem_reset_ring_status(dev_priv, ring);
2861 for_each_ring(ring, dev_priv, i)
2862 i915_gem_reset_ring_cleanup(dev_priv, ring);
2864 i915_gem_context_reset(dev);
2866 i915_gem_restore_fences(dev);
2868 WARN_ON(i915_verify_lists(dev));
2872 * This function clears the request list as sequence numbers are passed.
2875 i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
2877 WARN_ON(i915_verify_lists(ring->dev));
2879 /* Retire requests first as we use it above for the early return.
2880 * If we retire requests last, we may use a later seqno and so clear
2881 * the requests lists without clearing the active list, leading to
2884 while (!list_empty(&ring->request_list)) {
2885 struct drm_i915_gem_request *request;
2887 request = list_first_entry(&ring->request_list,
2888 struct drm_i915_gem_request,
2891 if (!i915_gem_request_completed(request, true))
2894 i915_gem_request_retire(request);
2897 /* Move any buffers on the active list that are no longer referenced
2898 * by the ringbuffer to the flushing/inactive lists as appropriate,
2899 * before we free the context associated with the requests.
2901 while (!list_empty(&ring->active_list)) {
2902 struct drm_i915_gem_object *obj;
2904 obj = list_first_entry(&ring->active_list,
2905 struct drm_i915_gem_object,
2906 ring_list[ring->id]);
2908 if (!list_empty(&obj->last_read_req[ring->id]->list))
2911 i915_gem_object_retire__read(obj, ring->id);
2914 if (unlikely(ring->trace_irq_req &&
2915 i915_gem_request_completed(ring->trace_irq_req, true))) {
2916 ring->irq_put(ring);
2917 i915_gem_request_assign(&ring->trace_irq_req, NULL);
2920 WARN_ON(i915_verify_lists(ring->dev));
2924 i915_gem_retire_requests(struct drm_device *dev)
2926 struct drm_i915_private *dev_priv = dev->dev_private;
2927 struct intel_engine_cs *ring;
2931 for_each_ring(ring, dev_priv, i) {
2932 i915_gem_retire_requests_ring(ring);
2933 idle &= list_empty(&ring->request_list);
2934 if (i915.enable_execlists) {
2935 unsigned long flags;
2937 spin_lock_irqsave(&ring->execlist_lock, flags);
2938 idle &= list_empty(&ring->execlist_queue);
2939 spin_unlock_irqrestore(&ring->execlist_lock, flags);
2941 intel_execlists_retire_requests(ring);
2946 mod_delayed_work(dev_priv->wq,
2947 &dev_priv->mm.idle_work,
2948 msecs_to_jiffies(100));
2954 i915_gem_retire_work_handler(struct work_struct *work)
2956 struct drm_i915_private *dev_priv =
2957 container_of(work, typeof(*dev_priv), mm.retire_work.work);
2958 struct drm_device *dev = dev_priv->dev;
2961 /* Come back later if the device is busy... */
2963 if (mutex_trylock(&dev->struct_mutex)) {
2964 idle = i915_gem_retire_requests(dev);
2965 mutex_unlock(&dev->struct_mutex);
2968 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work,
2969 round_jiffies_up_relative(HZ));
2973 i915_gem_idle_work_handler(struct work_struct *work)
2975 struct drm_i915_private *dev_priv =
2976 container_of(work, typeof(*dev_priv), mm.idle_work.work);
2977 struct drm_device *dev = dev_priv->dev;
2978 struct intel_engine_cs *ring;
2981 for_each_ring(ring, dev_priv, i)
2982 if (!list_empty(&ring->request_list))
2985 intel_mark_idle(dev);
2987 if (mutex_trylock(&dev->struct_mutex)) {
2988 struct intel_engine_cs *ring;
2991 for_each_ring(ring, dev_priv, i)
2992 i915_gem_batch_pool_fini(&ring->batch_pool);
2994 mutex_unlock(&dev->struct_mutex);
2999 * Ensures that an object will eventually get non-busy by flushing any required
3000 * write domains, emitting any outstanding lazy request and retiring and
3001 * completed requests.
3004 i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
3011 for (i = 0; i < I915_NUM_RINGS; i++) {
3012 struct drm_i915_gem_request *req;
3014 req = obj->last_read_req[i];
3018 if (list_empty(&req->list))
3021 if (i915_gem_request_completed(req, true)) {
3022 __i915_gem_request_retire__upto(req);
3024 i915_gem_object_retire__read(obj, i);
3032 * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
3033 * @DRM_IOCTL_ARGS: standard ioctl arguments
3035 * Returns 0 if successful, else an error is returned with the remaining time in
3036 * the timeout parameter.
3037 * -ETIME: object is still busy after timeout
3038 * -ERESTARTSYS: signal interrupted the wait
3039 * -ENONENT: object doesn't exist
3040 * Also possible, but rare:
3041 * -EAGAIN: GPU wedged
3043 * -ENODEV: Internal IRQ fail
3044 * -E?: The add request failed
3046 * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any
3047 * non-zero timeout parameter the wait ioctl will wait for the given number of
3048 * nanoseconds on an object becoming unbusy. Since the wait itself does so
3049 * without holding struct_mutex the object may become re-busied before this
3050 * function completes. A similar but shorter * race condition exists in the busy
3054 i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
3056 struct drm_i915_private *dev_priv = dev->dev_private;
3057 struct drm_i915_gem_wait *args = data;
3058 struct drm_i915_gem_object *obj;
3059 struct drm_i915_gem_request *req[I915_NUM_RINGS];
3060 unsigned reset_counter;
3064 if (args->flags != 0)
3067 ret = i915_mutex_lock_interruptible(dev);
3071 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->bo_handle));
3072 if (&obj->base == NULL) {
3073 mutex_unlock(&dev->struct_mutex);
3077 /* Need to make sure the object gets inactive eventually. */
3078 ret = i915_gem_object_flush_active(obj);
3085 /* Do this after OLR check to make sure we make forward progress polling
3086 * on this IOCTL with a timeout == 0 (like busy ioctl)
3088 if (args->timeout_ns == 0) {
3093 drm_gem_object_unreference(&obj->base);
3094 reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
3096 for (i = 0; i < I915_NUM_RINGS; i++) {
3097 if (obj->last_read_req[i] == NULL)
3100 req[n++] = i915_gem_request_reference(obj->last_read_req[i]);
3103 mutex_unlock(&dev->struct_mutex);
3105 for (i = 0; i < n; i++) {
3107 ret = __i915_wait_request(req[i], reset_counter, true,
3108 args->timeout_ns > 0 ? &args->timeout_ns : NULL,
3110 i915_gem_request_unreference__unlocked(req[i]);
3115 drm_gem_object_unreference(&obj->base);
3116 mutex_unlock(&dev->struct_mutex);
3121 __i915_gem_object_sync(struct drm_i915_gem_object *obj,
3122 struct intel_engine_cs *to,
3123 struct drm_i915_gem_request *from_req,
3124 struct drm_i915_gem_request **to_req)
3126 struct intel_engine_cs *from;
3129 from = i915_gem_request_get_ring(from_req);
3133 if (i915_gem_request_completed(from_req, true))
3136 if (!i915_semaphore_is_enabled(obj->base.dev)) {
3137 struct drm_i915_private *i915 = to_i915(obj->base.dev);
3138 ret = __i915_wait_request(from_req,
3139 atomic_read(&i915->gpu_error.reset_counter),
3140 i915->mm.interruptible,
3142 &i915->rps.semaphores);
3146 i915_gem_object_retire_request(obj, from_req);
3148 int idx = intel_ring_sync_index(from, to);
3149 u32 seqno = i915_gem_request_get_seqno(from_req);
3153 if (seqno <= from->semaphore.sync_seqno[idx])
3156 if (*to_req == NULL) {
3157 ret = i915_gem_request_alloc(to, to->default_context, to_req);
3162 trace_i915_gem_ring_sync_to(*to_req, from, from_req);
3163 ret = to->semaphore.sync_to(*to_req, from, seqno);
3167 /* We use last_read_req because sync_to()
3168 * might have just caused seqno wrap under
3171 from->semaphore.sync_seqno[idx] =
3172 i915_gem_request_get_seqno(obj->last_read_req[from->id]);
3179 * i915_gem_object_sync - sync an object to a ring.
3181 * @obj: object which may be in use on another ring.
3182 * @to: ring we wish to use the object on. May be NULL.
3183 * @to_req: request we wish to use the object for. See below.
3184 * This will be allocated and returned if a request is
3185 * required but not passed in.
3187 * This code is meant to abstract object synchronization with the GPU.
3188 * Calling with NULL implies synchronizing the object with the CPU
3189 * rather than a particular GPU ring. Conceptually we serialise writes
3190 * between engines inside the GPU. We only allow one engine to write
3191 * into a buffer at any time, but multiple readers. To ensure each has
3192 * a coherent view of memory, we must:
3194 * - If there is an outstanding write request to the object, the new
3195 * request must wait for it to complete (either CPU or in hw, requests
3196 * on the same ring will be naturally ordered).
3198 * - If we are a write request (pending_write_domain is set), the new
3199 * request must wait for outstanding read requests to complete.
3201 * For CPU synchronisation (NULL to) no request is required. For syncing with
3202 * rings to_req must be non-NULL. However, a request does not have to be
3203 * pre-allocated. If *to_req is NULL and sync commands will be emitted then a
3204 * request will be allocated automatically and returned through *to_req. Note
3205 * that it is not guaranteed that commands will be emitted (because the system
3206 * might already be idle). Hence there is no need to create a request that
3207 * might never have any work submitted. Note further that if a request is
3208 * returned in *to_req, it is the responsibility of the caller to submit
3209 * that request (after potentially adding more work to it).
3211 * Returns 0 if successful, else propagates up the lower layer error.
3214 i915_gem_object_sync(struct drm_i915_gem_object *obj,
3215 struct intel_engine_cs *to,
3216 struct drm_i915_gem_request **to_req)
3218 const bool readonly = obj->base.pending_write_domain == 0;
3219 struct drm_i915_gem_request *req[I915_NUM_RINGS];
3226 return i915_gem_object_wait_rendering(obj, readonly);
3230 if (obj->last_write_req)
3231 req[n++] = obj->last_write_req;
3233 for (i = 0; i < I915_NUM_RINGS; i++)
3234 if (obj->last_read_req[i])
3235 req[n++] = obj->last_read_req[i];
3237 for (i = 0; i < n; i++) {
3238 ret = __i915_gem_object_sync(obj, to, req[i], to_req);
3246 static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
3248 u32 old_write_domain, old_read_domains;
3250 /* Force a pagefault for domain tracking on next user access */
3251 i915_gem_release_mmap(obj);
3253 if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
3256 /* Wait for any direct GTT access to complete */
3259 old_read_domains = obj->base.read_domains;
3260 old_write_domain = obj->base.write_domain;
3262 obj->base.read_domains &= ~I915_GEM_DOMAIN_GTT;
3263 obj->base.write_domain &= ~I915_GEM_DOMAIN_GTT;
3265 trace_i915_gem_object_change_domain(obj,
3270 static int __i915_vma_unbind(struct i915_vma *vma, bool wait)
3272 struct drm_i915_gem_object *obj = vma->obj;
3273 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
3276 if (list_empty(&vma->vma_link))
3279 if (!drm_mm_node_allocated(&vma->node)) {
3280 i915_gem_vma_destroy(vma);
3287 BUG_ON(obj->pages == NULL);
3290 ret = i915_gem_object_wait_rendering(obj, false);
3295 if (i915_is_ggtt(vma->vm) &&
3296 vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
3297 i915_gem_object_finish_gtt(obj);
3299 /* release the fence reg _after_ flushing */
3300 ret = i915_gem_object_put_fence(obj);
3305 trace_i915_vma_unbind(vma);
3307 vma->vm->unbind_vma(vma);
3310 list_del_init(&vma->mm_list);
3311 if (i915_is_ggtt(vma->vm)) {
3312 if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
3313 obj->map_and_fenceable = false;
3314 } else if (vma->ggtt_view.pages) {
3315 sg_free_table(vma->ggtt_view.pages);
3316 kfree(vma->ggtt_view.pages);
3318 vma->ggtt_view.pages = NULL;
3321 drm_mm_remove_node(&vma->node);
3322 i915_gem_vma_destroy(vma);
3324 /* Since the unbound list is global, only move to that list if
3325 * no more VMAs exist. */
3326 if (list_empty(&obj->vma_list))
3327 list_move_tail(&obj->global_list, &dev_priv->mm.unbound_list);
3329 /* And finally now the object is completely decoupled from this vma,
3330 * we can drop its hold on the backing storage and allow it to be
3331 * reaped by the shrinker.
3333 i915_gem_object_unpin_pages(obj);
3338 int i915_vma_unbind(struct i915_vma *vma)
3340 return __i915_vma_unbind(vma, true);
3343 int __i915_vma_unbind_no_wait(struct i915_vma *vma)
3345 return __i915_vma_unbind(vma, false);
3348 int i915_gpu_idle(struct drm_device *dev)
3350 struct drm_i915_private *dev_priv = dev->dev_private;
3351 struct intel_engine_cs *ring;
3354 /* Flush everything onto the inactive list. */
3355 for_each_ring(ring, dev_priv, i) {
3356 if (!i915.enable_execlists) {
3357 struct drm_i915_gem_request *req;
3359 ret = i915_gem_request_alloc(ring, ring->default_context, &req);
3363 ret = i915_switch_context(req);
3365 i915_gem_request_cancel(req);
3369 i915_add_request_no_flush(req);
3372 ret = intel_ring_idle(ring);
3377 WARN_ON(i915_verify_lists(dev));
3381 static bool i915_gem_valid_gtt_space(struct i915_vma *vma,
3382 unsigned long cache_level)
3384 struct drm_mm_node *gtt_space = &vma->node;
3385 struct drm_mm_node *other;
3388 * On some machines we have to be careful when putting differing types
3389 * of snoopable memory together to avoid the prefetcher crossing memory
3390 * domains and dying. During vm initialisation, we decide whether or not
3391 * these constraints apply and set the drm_mm.color_adjust
3394 if (vma->vm->mm.color_adjust == NULL)
3397 if (!drm_mm_node_allocated(gtt_space))
3400 if (list_empty(>t_space->node_list))
3403 other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list);
3404 if (other->allocated && !other->hole_follows && other->color != cache_level)
3407 other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list);
3408 if (other->allocated && !gtt_space->hole_follows && other->color != cache_level)
3415 * Finds free space in the GTT aperture and binds the object or a view of it
3418 static struct i915_vma *
3419 i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
3420 struct i915_address_space *vm,
3421 const struct i915_ggtt_view *ggtt_view,
3425 struct drm_device *dev = obj->base.dev;
3426 struct drm_i915_private *dev_priv = dev->dev_private;
3427 u32 fence_alignment, unfenced_alignment;
3428 u32 search_flag, alloc_flag;
3430 u64 size, fence_size;
3431 struct i915_vma *vma;
3434 if (i915_is_ggtt(vm)) {
3437 if (WARN_ON(!ggtt_view))
3438 return ERR_PTR(-EINVAL);
3440 view_size = i915_ggtt_view_size(obj, ggtt_view);
3442 fence_size = i915_gem_get_gtt_size(dev,
3445 fence_alignment = i915_gem_get_gtt_alignment(dev,
3449 unfenced_alignment = i915_gem_get_gtt_alignment(dev,
3453 size = flags & PIN_MAPPABLE ? fence_size : view_size;
3455 fence_size = i915_gem_get_gtt_size(dev,
3458 fence_alignment = i915_gem_get_gtt_alignment(dev,
3462 unfenced_alignment =
3463 i915_gem_get_gtt_alignment(dev,
3467 size = flags & PIN_MAPPABLE ? fence_size : obj->base.size;
3470 start = flags & PIN_OFFSET_BIAS ? flags & PIN_OFFSET_MASK : 0;
3472 if (flags & PIN_MAPPABLE)
3473 end = min_t(u64, end, dev_priv->gtt.mappable_end);
3474 if (flags & PIN_ZONE_4G)
3475 end = min_t(u64, end, (1ULL << 32));
3478 alignment = flags & PIN_MAPPABLE ? fence_alignment :
3480 if (flags & PIN_MAPPABLE && alignment & (fence_alignment - 1)) {
3481 DRM_DEBUG("Invalid object (view type=%u) alignment requested %u\n",
3482 ggtt_view ? ggtt_view->type : 0,
3484 return ERR_PTR(-EINVAL);
3487 /* If binding the object/GGTT view requires more space than the entire
3488 * aperture has, reject it early before evicting everything in a vain
3489 * attempt to find space.
3492 DRM_DEBUG("Attempting to bind an object (view type=%u) larger than the aperture: size=%llu > %s aperture=%llu\n",
3493 ggtt_view ? ggtt_view->type : 0,
3495 flags & PIN_MAPPABLE ? "mappable" : "total",
3497 return ERR_PTR(-E2BIG);
3500 ret = i915_gem_object_get_pages(obj);
3502 return ERR_PTR(ret);
3504 i915_gem_object_pin_pages(obj);
3506 vma = ggtt_view ? i915_gem_obj_lookup_or_create_ggtt_vma(obj, ggtt_view) :
3507 i915_gem_obj_lookup_or_create_vma(obj, vm);
3512 if (flags & PIN_HIGH) {
3513 search_flag = DRM_MM_SEARCH_BELOW;
3514 alloc_flag = DRM_MM_CREATE_TOP;
3516 search_flag = DRM_MM_SEARCH_DEFAULT;
3517 alloc_flag = DRM_MM_CREATE_DEFAULT;
3521 ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node,
3528 ret = i915_gem_evict_something(dev, vm, size, alignment,
3537 if (WARN_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level))) {
3539 goto err_remove_node;
3542 trace_i915_vma_bind(vma, flags);
3543 ret = i915_vma_bind(vma, obj->cache_level, flags);
3545 goto err_remove_node;
3547 list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
3548 list_add_tail(&vma->mm_list, &vm->inactive_list);
3553 drm_mm_remove_node(&vma->node);
3555 i915_gem_vma_destroy(vma);
3558 i915_gem_object_unpin_pages(obj);
3563 i915_gem_clflush_object(struct drm_i915_gem_object *obj,
3566 /* If we don't have a page list set up, then we're not pinned
3567 * to GPU, and we can ignore the cache flush because it'll happen
3568 * again at bind time.
3570 if (obj->pages == NULL)
3574 * Stolen memory is always coherent with the GPU as it is explicitly
3575 * marked as wc by the system, or the system is cache-coherent.
3577 if (obj->stolen || obj->phys_handle)
3580 /* If the GPU is snooping the contents of the CPU cache,
3581 * we do not need to manually clear the CPU cache lines. However,
3582 * the caches are only snooped when the render cache is
3583 * flushed/invalidated. As we always have to emit invalidations
3584 * and flushes when moving into and out of the RENDER domain, correct
3585 * snooping behaviour occurs naturally as the result of our domain
3588 if (!force && cpu_cache_is_coherent(obj->base.dev, obj->cache_level)) {
3589 obj->cache_dirty = true;
3593 trace_i915_gem_object_clflush(obj);
3594 drm_clflush_sg(obj->pages);
3595 obj->cache_dirty = false;
3600 /** Flushes the GTT write domain for the object if it's dirty. */
3602 i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj)
3604 uint32_t old_write_domain;
3606 if (obj->base.write_domain != I915_GEM_DOMAIN_GTT)
3609 /* No actual flushing is required for the GTT write domain. Writes
3610 * to it immediately go to main memory as far as we know, so there's
3611 * no chipset flush. It also doesn't land in render cache.
3613 * However, we do have to enforce the order so that all writes through
3614 * the GTT land before any writes to the device, such as updates to
3619 old_write_domain = obj->base.write_domain;
3620 obj->base.write_domain = 0;
3622 intel_fb_obj_flush(obj, false, ORIGIN_GTT);
3624 trace_i915_gem_object_change_domain(obj,
3625 obj->base.read_domains,
3629 /** Flushes the CPU write domain for the object if it's dirty. */
3631 i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj)
3633 uint32_t old_write_domain;
3635 if (obj->base.write_domain != I915_GEM_DOMAIN_CPU)
3638 if (i915_gem_clflush_object(obj, obj->pin_display))
3639 i915_gem_chipset_flush(obj->base.dev);
3641 old_write_domain = obj->base.write_domain;
3642 obj->base.write_domain = 0;
3644 intel_fb_obj_flush(obj, false, ORIGIN_CPU);
3646 trace_i915_gem_object_change_domain(obj,
3647 obj->base.read_domains,
3652 * Moves a single object to the GTT read, and possibly write domain.
3654 * This function returns when the move is complete, including waiting on
3658 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
3660 uint32_t old_write_domain, old_read_domains;
3661 struct i915_vma *vma;
3664 if (obj->base.write_domain == I915_GEM_DOMAIN_GTT)
3667 ret = i915_gem_object_wait_rendering(obj, !write);
3671 /* Flush and acquire obj->pages so that we are coherent through
3672 * direct access in memory with previous cached writes through
3673 * shmemfs and that our cache domain tracking remains valid.
3674 * For example, if the obj->filp was moved to swap without us
3675 * being notified and releasing the pages, we would mistakenly
3676 * continue to assume that the obj remained out of the CPU cached
3679 ret = i915_gem_object_get_pages(obj);
3683 i915_gem_object_flush_cpu_write_domain(obj);
3685 /* Serialise direct access to this object with the barriers for
3686 * coherent writes from the GPU, by effectively invalidating the
3687 * GTT domain upon first access.
3689 if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
3692 old_write_domain = obj->base.write_domain;
3693 old_read_domains = obj->base.read_domains;
3695 /* It should now be out of any other write domains, and we can update
3696 * the domain values for our changes.
3698 BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
3699 obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3701 obj->base.read_domains = I915_GEM_DOMAIN_GTT;
3702 obj->base.write_domain = I915_GEM_DOMAIN_GTT;
3706 trace_i915_gem_object_change_domain(obj,
3710 /* And bump the LRU for this access */
3711 vma = i915_gem_obj_to_ggtt(obj);
3712 if (vma && drm_mm_node_allocated(&vma->node) && !obj->active)
3713 list_move_tail(&vma->mm_list,
3714 &to_i915(obj->base.dev)->gtt.base.inactive_list);
3720 * Changes the cache-level of an object across all VMA.
3722 * After this function returns, the object will be in the new cache-level
3723 * across all GTT and the contents of the backing storage will be coherent,
3724 * with respect to the new cache-level. In order to keep the backing storage
3725 * coherent for all users, we only allow a single cache level to be set
3726 * globally on the object and prevent it from being changed whilst the
3727 * hardware is reading from the object. That is if the object is currently
3728 * on the scanout it will be set to uncached (or equivalent display
3729 * cache coherency) and all non-MOCS GPU access will also be uncached so
3730 * that all direct access to the scanout remains coherent.
3732 int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
3733 enum i915_cache_level cache_level)
3735 struct drm_device *dev = obj->base.dev;
3736 struct i915_vma *vma, *next;
3740 if (obj->cache_level == cache_level)
3743 /* Inspect the list of currently bound VMA and unbind any that would
3744 * be invalid given the new cache-level. This is principally to
3745 * catch the issue of the CS prefetch crossing page boundaries and
3746 * reading an invalid PTE on older architectures.
3748 list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link) {
3749 if (!drm_mm_node_allocated(&vma->node))
3752 if (vma->pin_count) {
3753 DRM_DEBUG("can not change the cache level of pinned objects\n");
3757 if (!i915_gem_valid_gtt_space(vma, cache_level)) {
3758 ret = i915_vma_unbind(vma);
3765 /* We can reuse the existing drm_mm nodes but need to change the
3766 * cache-level on the PTE. We could simply unbind them all and
3767 * rebind with the correct cache-level on next use. However since
3768 * we already have a valid slot, dma mapping, pages etc, we may as
3769 * rewrite the PTE in the belief that doing so tramples upon less
3770 * state and so involves less work.
3773 /* Before we change the PTE, the GPU must not be accessing it.
3774 * If we wait upon the object, we know that all the bound
3775 * VMA are no longer active.
3777 ret = i915_gem_object_wait_rendering(obj, false);
3781 if (!HAS_LLC(dev) && cache_level != I915_CACHE_NONE) {
3782 /* Access to snoopable pages through the GTT is
3783 * incoherent and on some machines causes a hard
3784 * lockup. Relinquish the CPU mmaping to force
3785 * userspace to refault in the pages and we can
3786 * then double check if the GTT mapping is still
3787 * valid for that pointer access.
3789 i915_gem_release_mmap(obj);
3791 /* As we no longer need a fence for GTT access,
3792 * we can relinquish it now (and so prevent having
3793 * to steal a fence from someone else on the next
3794 * fence request). Note GPU activity would have
3795 * dropped the fence as all snoopable access is
3796 * supposed to be linear.
3798 ret = i915_gem_object_put_fence(obj);
3802 /* We either have incoherent backing store and
3803 * so no GTT access or the architecture is fully
3804 * coherent. In such cases, existing GTT mmaps
3805 * ignore the cache bit in the PTE and we can
3806 * rewrite it without confusing the GPU or having
3807 * to force userspace to fault back in its mmaps.
3811 list_for_each_entry(vma, &obj->vma_list, vma_link) {
3812 if (!drm_mm_node_allocated(&vma->node))
3815 ret = i915_vma_bind(vma, cache_level, PIN_UPDATE);
3821 list_for_each_entry(vma, &obj->vma_list, vma_link)
3822 vma->node.color = cache_level;
3823 obj->cache_level = cache_level;
3826 /* Flush the dirty CPU caches to the backing storage so that the
3827 * object is now coherent at its new cache level (with respect
3828 * to the access domain).
3830 if (obj->cache_dirty &&
3831 obj->base.write_domain != I915_GEM_DOMAIN_CPU &&
3832 cpu_write_needs_clflush(obj)) {
3833 if (i915_gem_clflush_object(obj, true))
3834 i915_gem_chipset_flush(obj->base.dev);
3840 int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
3841 struct drm_file *file)
3843 struct drm_i915_gem_caching *args = data;
3844 struct drm_i915_gem_object *obj;
3846 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3847 if (&obj->base == NULL)
3850 switch (obj->cache_level) {
3851 case I915_CACHE_LLC:
3852 case I915_CACHE_L3_LLC:
3853 args->caching = I915_CACHING_CACHED;
3857 args->caching = I915_CACHING_DISPLAY;
3861 args->caching = I915_CACHING_NONE;
3865 drm_gem_object_unreference_unlocked(&obj->base);
3869 int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
3870 struct drm_file *file)
3872 struct drm_i915_private *dev_priv = dev->dev_private;
3873 struct drm_i915_gem_caching *args = data;
3874 struct drm_i915_gem_object *obj;
3875 enum i915_cache_level level;
3878 switch (args->caching) {
3879 case I915_CACHING_NONE:
3880 level = I915_CACHE_NONE;
3882 case I915_CACHING_CACHED:
3884 * Due to a HW issue on BXT A stepping, GPU stores via a
3885 * snooped mapping may leave stale data in a corresponding CPU
3886 * cacheline, whereas normally such cachelines would get
3889 if (IS_BROXTON(dev) && INTEL_REVID(dev) < BXT_REVID_B0)
3892 level = I915_CACHE_LLC;
3894 case I915_CACHING_DISPLAY:
3895 level = HAS_WT(dev) ? I915_CACHE_WT : I915_CACHE_NONE;
3901 intel_runtime_pm_get(dev_priv);
3903 ret = i915_mutex_lock_interruptible(dev);
3907 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3908 if (&obj->base == NULL) {
3913 ret = i915_gem_object_set_cache_level(obj, level);
3915 drm_gem_object_unreference(&obj->base);
3917 mutex_unlock(&dev->struct_mutex);
3919 intel_runtime_pm_put(dev_priv);
3925 * Prepare buffer for display plane (scanout, cursors, etc).
3926 * Can be called from an uninterruptible phase (modesetting) and allows
3927 * any flushes to be pipelined (for pageflips).
3930 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
3932 struct intel_engine_cs *pipelined,
3933 struct drm_i915_gem_request **pipelined_request,
3934 const struct i915_ggtt_view *view)
3936 u32 old_read_domains, old_write_domain;
3939 ret = i915_gem_object_sync(obj, pipelined, pipelined_request);
3943 /* Mark the pin_display early so that we account for the
3944 * display coherency whilst setting up the cache domains.
3948 /* The display engine is not coherent with the LLC cache on gen6. As
3949 * a result, we make sure that the pinning that is about to occur is
3950 * done with uncached PTEs. This is lowest common denominator for all
3953 * However for gen6+, we could do better by using the GFDT bit instead
3954 * of uncaching, which would allow us to flush all the LLC-cached data
3955 * with that bit in the PTE to main memory with just one PIPE_CONTROL.
3957 ret = i915_gem_object_set_cache_level(obj,
3958 HAS_WT(obj->base.dev) ? I915_CACHE_WT : I915_CACHE_NONE);
3960 goto err_unpin_display;
3962 /* As the user may map the buffer once pinned in the display plane
3963 * (e.g. libkms for the bootup splash), we have to ensure that we
3964 * always use map_and_fenceable for all scanout buffers.
3966 ret = i915_gem_object_ggtt_pin(obj, view, alignment,
3967 view->type == I915_GGTT_VIEW_NORMAL ?
3970 goto err_unpin_display;
3972 i915_gem_object_flush_cpu_write_domain(obj);
3974 old_write_domain = obj->base.write_domain;
3975 old_read_domains = obj->base.read_domains;
3977 /* It should now be out of any other write domains, and we can update
3978 * the domain values for our changes.
3980 obj->base.write_domain = 0;
3981 obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3983 trace_i915_gem_object_change_domain(obj,
3995 i915_gem_object_unpin_from_display_plane(struct drm_i915_gem_object *obj,
3996 const struct i915_ggtt_view *view)
3998 if (WARN_ON(obj->pin_display == 0))
4001 i915_gem_object_ggtt_unpin_view(obj, view);
4007 * Moves a single object to the CPU read, and possibly write domain.
4009 * This function returns when the move is complete, including waiting on
4013 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
4015 uint32_t old_write_domain, old_read_domains;
4018 if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
4021 ret = i915_gem_object_wait_rendering(obj, !write);
4025 i915_gem_object_flush_gtt_write_domain(obj);
4027 old_write_domain = obj->base.write_domain;
4028 old_read_domains = obj->base.read_domains;
4030 /* Flush the CPU cache if it's still invalid. */
4031 if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) {
4032 i915_gem_clflush_object(obj, false);
4034 obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
4037 /* It should now be out of any other write domains, and we can update
4038 * the domain values for our changes.
4040 BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
4042 /* If we're writing through the CPU, then the GPU read domains will
4043 * need to be invalidated at next use.
4046 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4047 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4050 trace_i915_gem_object_change_domain(obj,
4057 /* Throttle our rendering by waiting until the ring has completed our requests
4058 * emitted over 20 msec ago.
4060 * Note that if we were to use the current jiffies each time around the loop,
4061 * we wouldn't escape the function with any frames outstanding if the time to
4062 * render a frame was over 20ms.
4064 * This should get us reasonable parallelism between CPU and GPU but also
4065 * relatively low latency when blocking on a particular request to finish.
4068 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
4070 struct drm_i915_private *dev_priv = dev->dev_private;
4071 struct drm_i915_file_private *file_priv = file->driver_priv;
4072 unsigned long recent_enough = jiffies - DRM_I915_THROTTLE_JIFFIES;
4073 struct drm_i915_gem_request *request, *target = NULL;
4074 unsigned reset_counter;
4077 ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
4081 ret = i915_gem_check_wedge(&dev_priv->gpu_error, false);
4085 spin_lock(&file_priv->mm.lock);
4086 list_for_each_entry(request, &file_priv->mm.request_list, client_list) {
4087 if (time_after_eq(request->emitted_jiffies, recent_enough))
4091 * Note that the request might not have been submitted yet.
4092 * In which case emitted_jiffies will be zero.
4094 if (!request->emitted_jiffies)
4099 reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
4101 i915_gem_request_reference(target);
4102 spin_unlock(&file_priv->mm.lock);
4107 ret = __i915_wait_request(target, reset_counter, true, NULL, NULL);
4109 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
4111 i915_gem_request_unreference__unlocked(target);
4117 i915_vma_misplaced(struct i915_vma *vma, uint32_t alignment, uint64_t flags)
4119 struct drm_i915_gem_object *obj = vma->obj;
4122 vma->node.start & (alignment - 1))
4125 if (flags & PIN_MAPPABLE && !obj->map_and_fenceable)
4128 if (flags & PIN_OFFSET_BIAS &&
4129 vma->node.start < (flags & PIN_OFFSET_MASK))
4135 void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
4137 struct drm_i915_gem_object *obj = vma->obj;
4138 bool mappable, fenceable;
4139 u32 fence_size, fence_alignment;
4141 fence_size = i915_gem_get_gtt_size(obj->base.dev,
4144 fence_alignment = i915_gem_get_gtt_alignment(obj->base.dev,
4149 fenceable = (vma->node.size == fence_size &&
4150 (vma->node.start & (fence_alignment - 1)) == 0);
4152 mappable = (vma->node.start + fence_size <=
4153 to_i915(obj->base.dev)->gtt.mappable_end);
4155 obj->map_and_fenceable = mappable && fenceable;
4159 i915_gem_object_do_pin(struct drm_i915_gem_object *obj,
4160 struct i915_address_space *vm,
4161 const struct i915_ggtt_view *ggtt_view,
4165 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
4166 struct i915_vma *vma;
4170 if (WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base))
4173 if (WARN_ON(flags & (PIN_GLOBAL | PIN_MAPPABLE) && !i915_is_ggtt(vm)))
4176 if (WARN_ON((flags & (PIN_MAPPABLE | PIN_GLOBAL)) == PIN_MAPPABLE))
4179 if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
4182 vma = ggtt_view ? i915_gem_obj_to_ggtt_view(obj, ggtt_view) :
4183 i915_gem_obj_to_vma(obj, vm);
4186 return PTR_ERR(vma);
4189 if (WARN_ON(vma->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT))
4192 if (i915_vma_misplaced(vma, alignment, flags)) {
4193 WARN(vma->pin_count,
4194 "bo is already pinned in %s with incorrect alignment:"
4195 " offset=%08x %08x, req.alignment=%x, req.map_and_fenceable=%d,"
4196 " obj->map_and_fenceable=%d\n",
4197 ggtt_view ? "ggtt" : "ppgtt",
4198 upper_32_bits(vma->node.start),
4199 lower_32_bits(vma->node.start),
4201 !!(flags & PIN_MAPPABLE),
4202 obj->map_and_fenceable);
4203 ret = i915_vma_unbind(vma);
4211 bound = vma ? vma->bound : 0;
4212 if (vma == NULL || !drm_mm_node_allocated(&vma->node)) {
4213 vma = i915_gem_object_bind_to_vm(obj, vm, ggtt_view, alignment,
4216 return PTR_ERR(vma);
4218 ret = i915_vma_bind(vma, obj->cache_level, flags);
4223 if (ggtt_view && ggtt_view->type == I915_GGTT_VIEW_NORMAL &&
4224 (bound ^ vma->bound) & GLOBAL_BIND) {
4225 __i915_vma_set_map_and_fenceable(vma);
4226 WARN_ON(flags & PIN_MAPPABLE && !obj->map_and_fenceable);
4234 i915_gem_object_pin(struct drm_i915_gem_object *obj,
4235 struct i915_address_space *vm,
4239 return i915_gem_object_do_pin(obj, vm,
4240 i915_is_ggtt(vm) ? &i915_ggtt_view_normal : NULL,
4245 i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
4246 const struct i915_ggtt_view *view,
4250 if (WARN_ONCE(!view, "no view specified"))
4253 return i915_gem_object_do_pin(obj, i915_obj_to_ggtt(obj), view,
4254 alignment, flags | PIN_GLOBAL);
4258 i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj,
4259 const struct i915_ggtt_view *view)
4261 struct i915_vma *vma = i915_gem_obj_to_ggtt_view(obj, view);
4264 WARN_ON(vma->pin_count == 0);
4265 WARN_ON(!i915_gem_obj_ggtt_bound_view(obj, view));
4271 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
4272 struct drm_file *file)
4274 struct drm_i915_gem_busy *args = data;
4275 struct drm_i915_gem_object *obj;
4278 ret = i915_mutex_lock_interruptible(dev);
4282 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
4283 if (&obj->base == NULL) {
4288 /* Count all active objects as busy, even if they are currently not used
4289 * by the gpu. Users of this interface expect objects to eventually
4290 * become non-busy without any further actions, therefore emit any
4291 * necessary flushes here.
4293 ret = i915_gem_object_flush_active(obj);
4297 BUILD_BUG_ON(I915_NUM_RINGS > 16);
4298 args->busy = obj->active << 16;
4299 if (obj->last_write_req)
4300 args->busy |= obj->last_write_req->ring->id;
4303 drm_gem_object_unreference(&obj->base);
4305 mutex_unlock(&dev->struct_mutex);
4310 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
4311 struct drm_file *file_priv)
4313 return i915_gem_ring_throttle(dev, file_priv);
4317 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
4318 struct drm_file *file_priv)
4320 struct drm_i915_private *dev_priv = dev->dev_private;
4321 struct drm_i915_gem_madvise *args = data;
4322 struct drm_i915_gem_object *obj;
4325 switch (args->madv) {
4326 case I915_MADV_DONTNEED:
4327 case I915_MADV_WILLNEED:
4333 ret = i915_mutex_lock_interruptible(dev);
4337 obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle));
4338 if (&obj->base == NULL) {
4343 if (i915_gem_obj_is_pinned(obj)) {
4349 obj->tiling_mode != I915_TILING_NONE &&
4350 dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) {
4351 if (obj->madv == I915_MADV_WILLNEED)
4352 i915_gem_object_unpin_pages(obj);
4353 if (args->madv == I915_MADV_WILLNEED)
4354 i915_gem_object_pin_pages(obj);
4357 if (obj->madv != __I915_MADV_PURGED)
4358 obj->madv = args->madv;
4360 /* if the object is no longer attached, discard its backing storage */
4361 if (obj->madv == I915_MADV_DONTNEED && obj->pages == NULL)
4362 i915_gem_object_truncate(obj);
4364 args->retained = obj->madv != __I915_MADV_PURGED;
4367 drm_gem_object_unreference(&obj->base);
4369 mutex_unlock(&dev->struct_mutex);
4373 void i915_gem_object_init(struct drm_i915_gem_object *obj,
4374 const struct drm_i915_gem_object_ops *ops)
4378 INIT_LIST_HEAD(&obj->global_list);
4379 for (i = 0; i < I915_NUM_RINGS; i++)
4380 INIT_LIST_HEAD(&obj->ring_list[i]);
4381 INIT_LIST_HEAD(&obj->obj_exec_link);
4382 INIT_LIST_HEAD(&obj->vma_list);
4383 INIT_LIST_HEAD(&obj->batch_pool_link);
4387 obj->fence_reg = I915_FENCE_REG_NONE;
4388 obj->madv = I915_MADV_WILLNEED;
4390 i915_gem_info_add_obj(obj->base.dev->dev_private, obj->base.size);
4393 static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
4394 .get_pages = i915_gem_object_get_pages_gtt,
4395 .put_pages = i915_gem_object_put_pages_gtt,
4398 struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
4401 struct drm_i915_gem_object *obj;
4402 struct address_space *mapping;
4405 obj = i915_gem_object_alloc(dev);
4409 if (drm_gem_object_init(dev, &obj->base, size) != 0) {
4410 i915_gem_object_free(obj);
4414 mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
4415 if (IS_CRESTLINE(dev) || IS_BROADWATER(dev)) {
4416 /* 965gm cannot relocate objects above 4GiB. */
4417 mask &= ~__GFP_HIGHMEM;
4418 mask |= __GFP_DMA32;
4421 mapping = file_inode(obj->base.filp)->i_mapping;
4422 mapping_set_gfp_mask(mapping, mask);
4424 i915_gem_object_init(obj, &i915_gem_object_ops);
4426 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4427 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4430 /* On some devices, we can have the GPU use the LLC (the CPU
4431 * cache) for about a 10% performance improvement
4432 * compared to uncached. Graphics requests other than
4433 * display scanout are coherent with the CPU in
4434 * accessing this cache. This means in this mode we
4435 * don't need to clflush on the CPU side, and on the
4436 * GPU side we only need to flush internal caches to
4437 * get data visible to the CPU.
4439 * However, we maintain the display planes as UC, and so
4440 * need to rebind when first used as such.
4442 obj->cache_level = I915_CACHE_LLC;
4444 obj->cache_level = I915_CACHE_NONE;
4446 trace_i915_gem_object_create(obj);
4451 static bool discard_backing_storage(struct drm_i915_gem_object *obj)
4453 /* If we are the last user of the backing storage (be it shmemfs
4454 * pages or stolen etc), we know that the pages are going to be
4455 * immediately released. In this case, we can then skip copying
4456 * back the contents from the GPU.
4459 if (obj->madv != I915_MADV_WILLNEED)
4462 if (obj->base.filp == NULL)
4465 /* At first glance, this looks racy, but then again so would be
4466 * userspace racing mmap against close. However, the first external
4467 * reference to the filp can only be obtained through the
4468 * i915_gem_mmap_ioctl() which safeguards us against the user
4469 * acquiring such a reference whilst we are in the middle of
4470 * freeing the object.
4472 return atomic_long_read(&obj->base.filp->f_count) == 1;
4475 void i915_gem_free_object(struct drm_gem_object *gem_obj)
4477 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
4478 struct drm_device *dev = obj->base.dev;
4479 struct drm_i915_private *dev_priv = dev->dev_private;
4480 struct i915_vma *vma, *next;
4482 intel_runtime_pm_get(dev_priv);
4484 trace_i915_gem_object_destroy(obj);
4486 list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link) {
4490 ret = i915_vma_unbind(vma);
4491 if (WARN_ON(ret == -ERESTARTSYS)) {
4492 bool was_interruptible;
4494 was_interruptible = dev_priv->mm.interruptible;
4495 dev_priv->mm.interruptible = false;
4497 WARN_ON(i915_vma_unbind(vma));
4499 dev_priv->mm.interruptible = was_interruptible;
4503 /* Stolen objects don't hold a ref, but do hold pin count. Fix that up
4504 * before progressing. */
4506 i915_gem_object_unpin_pages(obj);
4508 WARN_ON(obj->frontbuffer_bits);
4510 if (obj->pages && obj->madv == I915_MADV_WILLNEED &&
4511 dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES &&
4512 obj->tiling_mode != I915_TILING_NONE)
4513 i915_gem_object_unpin_pages(obj);
4515 if (WARN_ON(obj->pages_pin_count))
4516 obj->pages_pin_count = 0;
4517 if (discard_backing_storage(obj))
4518 obj->madv = I915_MADV_DONTNEED;
4519 i915_gem_object_put_pages(obj);
4520 i915_gem_object_free_mmap_offset(obj);
4524 if (obj->base.import_attach)
4525 drm_prime_gem_destroy(&obj->base, NULL);
4527 if (obj->ops->release)
4528 obj->ops->release(obj);
4530 drm_gem_object_release(&obj->base);
4531 i915_gem_info_remove_obj(dev_priv, obj->base.size);
4534 i915_gem_object_free(obj);
4536 intel_runtime_pm_put(dev_priv);
4539 struct i915_vma *i915_gem_obj_to_vma(struct drm_i915_gem_object *obj,
4540 struct i915_address_space *vm)
4542 struct i915_vma *vma;
4543 list_for_each_entry(vma, &obj->vma_list, vma_link) {
4544 if (i915_is_ggtt(vma->vm) &&
4545 vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
4553 struct i915_vma *i915_gem_obj_to_ggtt_view(struct drm_i915_gem_object *obj,
4554 const struct i915_ggtt_view *view)
4556 struct i915_address_space *ggtt = i915_obj_to_ggtt(obj);
4557 struct i915_vma *vma;
4559 if (WARN_ONCE(!view, "no view specified"))
4560 return ERR_PTR(-EINVAL);
4562 list_for_each_entry(vma, &obj->vma_list, vma_link)
4563 if (vma->vm == ggtt &&
4564 i915_ggtt_view_equal(&vma->ggtt_view, view))
4569 void i915_gem_vma_destroy(struct i915_vma *vma)
4571 struct i915_address_space *vm = NULL;
4572 WARN_ON(vma->node.allocated);
4574 /* Keep the vma as a placeholder in the execbuffer reservation lists */
4575 if (!list_empty(&vma->exec_list))
4580 if (!i915_is_ggtt(vm))
4581 i915_ppgtt_put(i915_vm_to_ppgtt(vm));
4583 list_del(&vma->vma_link);
4585 kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma);
4589 i915_gem_stop_ringbuffers(struct drm_device *dev)
4591 struct drm_i915_private *dev_priv = dev->dev_private;
4592 struct intel_engine_cs *ring;
4595 for_each_ring(ring, dev_priv, i)
4596 dev_priv->gt.stop_ring(ring);
4600 i915_gem_suspend(struct drm_device *dev)
4602 struct drm_i915_private *dev_priv = dev->dev_private;
4605 mutex_lock(&dev->struct_mutex);
4606 ret = i915_gpu_idle(dev);
4610 i915_gem_retire_requests(dev);
4612 i915_gem_stop_ringbuffers(dev);
4613 mutex_unlock(&dev->struct_mutex);
4615 cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
4616 cancel_delayed_work_sync(&dev_priv->mm.retire_work);
4617 flush_delayed_work(&dev_priv->mm.idle_work);
4619 /* Assert that we sucessfully flushed all the work and
4620 * reset the GPU back to its idle, low power state.
4622 WARN_ON(dev_priv->mm.busy);
4627 mutex_unlock(&dev->struct_mutex);
4631 int i915_gem_l3_remap(struct drm_i915_gem_request *req, int slice)
4633 struct intel_engine_cs *ring = req->ring;
4634 struct drm_device *dev = ring->dev;
4635 struct drm_i915_private *dev_priv = dev->dev_private;
4636 u32 reg_base = GEN7_L3LOG_BASE + (slice * 0x200);
4637 u32 *remap_info = dev_priv->l3_parity.remap_info[slice];
4640 if (!HAS_L3_DPF(dev) || !remap_info)
4643 ret = intel_ring_begin(req, GEN7_L3LOG_SIZE / 4 * 3);
4648 * Note: We do not worry about the concurrent register cacheline hang
4649 * here because no other code should access these registers other than
4650 * at initialization time.
4652 for (i = 0; i < GEN7_L3LOG_SIZE; i += 4) {
4653 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
4654 intel_ring_emit(ring, reg_base + i);
4655 intel_ring_emit(ring, remap_info[i/4]);
4658 intel_ring_advance(ring);
4663 void i915_gem_init_swizzling(struct drm_device *dev)
4665 struct drm_i915_private *dev_priv = dev->dev_private;
4667 if (INTEL_INFO(dev)->gen < 5 ||
4668 dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
4671 I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
4672 DISP_TILE_SURFACE_SWIZZLING);
4677 I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
4679 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
4680 else if (IS_GEN7(dev))
4681 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
4682 else if (IS_GEN8(dev))
4683 I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));
4688 static void init_unused_ring(struct drm_device *dev, u32 base)
4690 struct drm_i915_private *dev_priv = dev->dev_private;
4692 I915_WRITE(RING_CTL(base), 0);
4693 I915_WRITE(RING_HEAD(base), 0);
4694 I915_WRITE(RING_TAIL(base), 0);
4695 I915_WRITE(RING_START(base), 0);
4698 static void init_unused_rings(struct drm_device *dev)
4701 init_unused_ring(dev, PRB1_BASE);
4702 init_unused_ring(dev, SRB0_BASE);
4703 init_unused_ring(dev, SRB1_BASE);
4704 init_unused_ring(dev, SRB2_BASE);
4705 init_unused_ring(dev, SRB3_BASE);
4706 } else if (IS_GEN2(dev)) {
4707 init_unused_ring(dev, SRB0_BASE);
4708 init_unused_ring(dev, SRB1_BASE);
4709 } else if (IS_GEN3(dev)) {
4710 init_unused_ring(dev, PRB1_BASE);
4711 init_unused_ring(dev, PRB2_BASE);
4715 int i915_gem_init_rings(struct drm_device *dev)
4717 struct drm_i915_private *dev_priv = dev->dev_private;
4720 ret = intel_init_render_ring_buffer(dev);
4725 ret = intel_init_bsd_ring_buffer(dev);
4727 goto cleanup_render_ring;
4731 ret = intel_init_blt_ring_buffer(dev);
4733 goto cleanup_bsd_ring;
4736 if (HAS_VEBOX(dev)) {
4737 ret = intel_init_vebox_ring_buffer(dev);
4739 goto cleanup_blt_ring;
4742 if (HAS_BSD2(dev)) {
4743 ret = intel_init_bsd2_ring_buffer(dev);
4745 goto cleanup_vebox_ring;
4751 intel_cleanup_ring_buffer(&dev_priv->ring[VECS]);
4753 intel_cleanup_ring_buffer(&dev_priv->ring[BCS]);
4755 intel_cleanup_ring_buffer(&dev_priv->ring[VCS]);
4756 cleanup_render_ring:
4757 intel_cleanup_ring_buffer(&dev_priv->ring[RCS]);
4763 i915_gem_init_hw(struct drm_device *dev)
4765 struct drm_i915_private *dev_priv = dev->dev_private;
4766 struct intel_engine_cs *ring;
4769 if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
4772 /* Double layer security blanket, see i915_gem_init() */
4773 intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
4775 if (dev_priv->ellc_size)
4776 I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf));
4778 if (IS_HASWELL(dev))
4779 I915_WRITE(MI_PREDICATE_RESULT_2, IS_HSW_GT3(dev) ?
4780 LOWER_SLICE_ENABLED : LOWER_SLICE_DISABLED);
4782 if (HAS_PCH_NOP(dev)) {
4783 if (IS_IVYBRIDGE(dev)) {
4784 u32 temp = I915_READ(GEN7_MSG_CTL);
4785 temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
4786 I915_WRITE(GEN7_MSG_CTL, temp);
4787 } else if (INTEL_INFO(dev)->gen >= 7) {
4788 u32 temp = I915_READ(HSW_NDE_RSTWRN_OPT);
4789 temp &= ~RESET_PCH_HANDSHAKE_ENABLE;
4790 I915_WRITE(HSW_NDE_RSTWRN_OPT, temp);
4794 i915_gem_init_swizzling(dev);
4797 * At least 830 can leave some of the unused rings
4798 * "active" (ie. head != tail) after resume which
4799 * will prevent c3 entry. Makes sure all unused rings
4802 init_unused_rings(dev);
4804 BUG_ON(!dev_priv->ring[RCS].default_context);
4806 ret = i915_ppgtt_init_hw(dev);
4808 DRM_ERROR("PPGTT enable HW failed %d\n", ret);
4812 /* Need to do basic initialisation of all rings first: */
4813 for_each_ring(ring, dev_priv, i) {
4814 ret = ring->init_hw(ring);
4819 /* We can't enable contexts until all firmware is loaded */
4820 if (HAS_GUC_UCODE(dev)) {
4821 ret = intel_guc_ucode_load(dev);
4824 * If we got an error and GuC submission is enabled, map
4825 * the error to -EIO so the GPU will be declared wedged.
4826 * OTOH, if we didn't intend to use the GuC anyway, just
4827 * discard the error and carry on.
4829 DRM_ERROR("Failed to initialize GuC, error %d%s\n", ret,
4830 i915.enable_guc_submission ? "" :
4832 ret = i915.enable_guc_submission ? -EIO : 0;
4839 * Increment the next seqno by 0x100 so we have a visible break
4840 * on re-initialisation
4842 ret = i915_gem_set_seqno(dev, dev_priv->next_seqno+0x100);
4846 /* Now it is safe to go back round and do everything else: */
4847 for_each_ring(ring, dev_priv, i) {
4848 struct drm_i915_gem_request *req;
4850 WARN_ON(!ring->default_context);
4852 ret = i915_gem_request_alloc(ring, ring->default_context, &req);
4854 i915_gem_cleanup_ringbuffer(dev);
4858 if (ring->id == RCS) {
4859 for (j = 0; j < NUM_L3_SLICES(dev); j++)
4860 i915_gem_l3_remap(req, j);
4863 ret = i915_ppgtt_init_ring(req);
4864 if (ret && ret != -EIO) {
4865 DRM_ERROR("PPGTT enable ring #%d failed %d\n", i, ret);
4866 i915_gem_request_cancel(req);
4867 i915_gem_cleanup_ringbuffer(dev);
4871 ret = i915_gem_context_enable(req);
4872 if (ret && ret != -EIO) {
4873 DRM_ERROR("Context enable ring #%d failed %d\n", i, ret);
4874 i915_gem_request_cancel(req);
4875 i915_gem_cleanup_ringbuffer(dev);
4879 i915_add_request_no_flush(req);
4883 intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
4887 int i915_gem_init(struct drm_device *dev)
4889 struct drm_i915_private *dev_priv = dev->dev_private;
4892 i915.enable_execlists = intel_sanitize_enable_execlists(dev,
4893 i915.enable_execlists);
4895 mutex_lock(&dev->struct_mutex);
4897 if (IS_VALLEYVIEW(dev)) {
4898 /* VLVA0 (potential hack), BIOS isn't actually waking us */
4899 I915_WRITE(VLV_GTLC_WAKE_CTRL, VLV_GTLC_ALLOWWAKEREQ);
4900 if (wait_for((I915_READ(VLV_GTLC_PW_STATUS) &
4901 VLV_GTLC_ALLOWWAKEACK), 10))
4902 DRM_DEBUG_DRIVER("allow wake ack timed out\n");
4905 if (!i915.enable_execlists) {
4906 dev_priv->gt.execbuf_submit = i915_gem_ringbuffer_submission;
4907 dev_priv->gt.init_rings = i915_gem_init_rings;
4908 dev_priv->gt.cleanup_ring = intel_cleanup_ring_buffer;
4909 dev_priv->gt.stop_ring = intel_stop_ring_buffer;
4911 dev_priv->gt.execbuf_submit = intel_execlists_submission;
4912 dev_priv->gt.init_rings = intel_logical_rings_init;
4913 dev_priv->gt.cleanup_ring = intel_logical_ring_cleanup;
4914 dev_priv->gt.stop_ring = intel_logical_ring_stop;
4917 /* This is just a security blanket to placate dragons.
4918 * On some systems, we very sporadically observe that the first TLBs
4919 * used by the CS may be stale, despite us poking the TLB reset. If
4920 * we hold the forcewake during initialisation these problems
4921 * just magically go away.
4923 intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
4925 ret = i915_gem_init_userptr(dev);
4929 i915_gem_init_global_gtt(dev);
4931 ret = i915_gem_context_init(dev);
4935 ret = dev_priv->gt.init_rings(dev);
4939 ret = i915_gem_init_hw(dev);
4941 /* Allow ring initialisation to fail by marking the GPU as
4942 * wedged. But we only want to do this where the GPU is angry,
4943 * for all other failure, such as an allocation failure, bail.
4945 DRM_ERROR("Failed to initialize GPU, declaring it wedged\n");
4946 atomic_or(I915_WEDGED, &dev_priv->gpu_error.reset_counter);
4951 intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
4952 mutex_unlock(&dev->struct_mutex);
4958 i915_gem_cleanup_ringbuffer(struct drm_device *dev)
4960 struct drm_i915_private *dev_priv = dev->dev_private;
4961 struct intel_engine_cs *ring;
4964 for_each_ring(ring, dev_priv, i)
4965 dev_priv->gt.cleanup_ring(ring);
4967 if (i915.enable_execlists)
4969 * Neither the BIOS, ourselves or any other kernel
4970 * expects the system to be in execlists mode on startup,
4971 * so we need to reset the GPU back to legacy mode.
4973 intel_gpu_reset(dev);
4977 init_ring_lists(struct intel_engine_cs *ring)
4979 INIT_LIST_HEAD(&ring->active_list);
4980 INIT_LIST_HEAD(&ring->request_list);
4984 i915_gem_load(struct drm_device *dev)
4986 struct drm_i915_private *dev_priv = dev->dev_private;
4990 kmem_cache_create("i915_gem_object",
4991 sizeof(struct drm_i915_gem_object), 0,
4995 kmem_cache_create("i915_gem_vma",
4996 sizeof(struct i915_vma), 0,
4999 dev_priv->requests =
5000 kmem_cache_create("i915_gem_request",
5001 sizeof(struct drm_i915_gem_request), 0,
5005 INIT_LIST_HEAD(&dev_priv->vm_list);
5006 INIT_LIST_HEAD(&dev_priv->context_list);
5007 INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
5008 INIT_LIST_HEAD(&dev_priv->mm.bound_list);
5009 INIT_LIST_HEAD(&dev_priv->mm.fence_list);
5010 for (i = 0; i < I915_NUM_RINGS; i++)
5011 init_ring_lists(&dev_priv->ring[i]);
5012 for (i = 0; i < I915_MAX_NUM_FENCES; i++)
5013 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
5014 INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
5015 i915_gem_retire_work_handler);
5016 INIT_DELAYED_WORK(&dev_priv->mm.idle_work,
5017 i915_gem_idle_work_handler);
5018 init_waitqueue_head(&dev_priv->gpu_error.reset_queue);
5020 dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL;
5022 if (INTEL_INFO(dev)->gen >= 7 && !IS_VALLEYVIEW(dev))
5023 dev_priv->num_fence_regs = 32;
5024 else if (INTEL_INFO(dev)->gen >= 4 || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
5025 dev_priv->num_fence_regs = 16;
5027 dev_priv->num_fence_regs = 8;
5029 if (intel_vgpu_active(dev))
5030 dev_priv->num_fence_regs =
5031 I915_READ(vgtif_reg(avail_rs.fence_num));
5034 * Set initial sequence number for requests.
5035 * Using this number allows the wraparound to happen early,
5036 * catching any obvious problems.
5038 dev_priv->next_seqno = ((u32)~0 - 0x1100);
5039 dev_priv->last_seqno = ((u32)~0 - 0x1101);
5041 /* Initialize fence registers to zero */
5042 INIT_LIST_HEAD(&dev_priv->mm.fence_list);
5043 i915_gem_restore_fences(dev);
5045 i915_gem_detect_bit_6_swizzle(dev);
5046 init_waitqueue_head(&dev_priv->pending_flip_queue);
5048 dev_priv->mm.interruptible = true;
5050 i915_gem_shrinker_init(dev_priv);
5052 mutex_init(&dev_priv->fb_tracking.lock);
5055 void i915_gem_release(struct drm_device *dev, struct drm_file *file)
5057 struct drm_i915_file_private *file_priv = file->driver_priv;
5059 /* Clean up our request list when the client is going away, so that
5060 * later retire_requests won't dereference our soon-to-be-gone
5063 spin_lock(&file_priv->mm.lock);
5064 while (!list_empty(&file_priv->mm.request_list)) {
5065 struct drm_i915_gem_request *request;
5067 request = list_first_entry(&file_priv->mm.request_list,
5068 struct drm_i915_gem_request,
5070 list_del(&request->client_list);
5071 request->file_priv = NULL;
5073 spin_unlock(&file_priv->mm.lock);
5075 if (!list_empty(&file_priv->rps.link)) {
5076 spin_lock(&to_i915(dev)->rps.client_lock);
5077 list_del(&file_priv->rps.link);
5078 spin_unlock(&to_i915(dev)->rps.client_lock);
5082 int i915_gem_open(struct drm_device *dev, struct drm_file *file)
5084 struct drm_i915_file_private *file_priv;
5087 DRM_DEBUG_DRIVER("\n");
5089 file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
5093 file->driver_priv = file_priv;
5094 file_priv->dev_priv = dev->dev_private;
5095 file_priv->file = file;
5096 INIT_LIST_HEAD(&file_priv->rps.link);
5098 spin_lock_init(&file_priv->mm.lock);
5099 INIT_LIST_HEAD(&file_priv->mm.request_list);
5101 ret = i915_gem_context_open(dev, file);
5109 * i915_gem_track_fb - update frontbuffer tracking
5110 * @old: current GEM buffer for the frontbuffer slots
5111 * @new: new GEM buffer for the frontbuffer slots
5112 * @frontbuffer_bits: bitmask of frontbuffer slots
5114 * This updates the frontbuffer tracking bits @frontbuffer_bits by clearing them
5115 * from @old and setting them in @new. Both @old and @new can be NULL.
5117 void i915_gem_track_fb(struct drm_i915_gem_object *old,
5118 struct drm_i915_gem_object *new,
5119 unsigned frontbuffer_bits)
5122 WARN_ON(!mutex_is_locked(&old->base.dev->struct_mutex));
5123 WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits));
5124 old->frontbuffer_bits &= ~frontbuffer_bits;
5128 WARN_ON(!mutex_is_locked(&new->base.dev->struct_mutex));
5129 WARN_ON(new->frontbuffer_bits & frontbuffer_bits);
5130 new->frontbuffer_bits |= frontbuffer_bits;
5134 /* All the new VM stuff */
5135 u64 i915_gem_obj_offset(struct drm_i915_gem_object *o,
5136 struct i915_address_space *vm)
5138 struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5139 struct i915_vma *vma;
5141 WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base);
5143 list_for_each_entry(vma, &o->vma_list, vma_link) {
5144 if (i915_is_ggtt(vma->vm) &&
5145 vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5148 return vma->node.start;
5151 WARN(1, "%s vma for this object not found.\n",
5152 i915_is_ggtt(vm) ? "global" : "ppgtt");
5156 u64 i915_gem_obj_ggtt_offset_view(struct drm_i915_gem_object *o,
5157 const struct i915_ggtt_view *view)
5159 struct i915_address_space *ggtt = i915_obj_to_ggtt(o);
5160 struct i915_vma *vma;
5162 list_for_each_entry(vma, &o->vma_list, vma_link)
5163 if (vma->vm == ggtt &&
5164 i915_ggtt_view_equal(&vma->ggtt_view, view))
5165 return vma->node.start;
5167 WARN(1, "global vma for this object not found. (view=%u)\n", view->type);
5171 bool i915_gem_obj_bound(struct drm_i915_gem_object *o,
5172 struct i915_address_space *vm)
5174 struct i915_vma *vma;
5176 list_for_each_entry(vma, &o->vma_list, vma_link) {
5177 if (i915_is_ggtt(vma->vm) &&
5178 vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5180 if (vma->vm == vm && drm_mm_node_allocated(&vma->node))
5187 bool i915_gem_obj_ggtt_bound_view(struct drm_i915_gem_object *o,
5188 const struct i915_ggtt_view *view)
5190 struct i915_address_space *ggtt = i915_obj_to_ggtt(o);
5191 struct i915_vma *vma;
5193 list_for_each_entry(vma, &o->vma_list, vma_link)
5194 if (vma->vm == ggtt &&
5195 i915_ggtt_view_equal(&vma->ggtt_view, view) &&
5196 drm_mm_node_allocated(&vma->node))
5202 bool i915_gem_obj_bound_any(struct drm_i915_gem_object *o)
5204 struct i915_vma *vma;
5206 list_for_each_entry(vma, &o->vma_list, vma_link)
5207 if (drm_mm_node_allocated(&vma->node))
5213 unsigned long i915_gem_obj_size(struct drm_i915_gem_object *o,
5214 struct i915_address_space *vm)
5216 struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5217 struct i915_vma *vma;
5219 WARN_ON(vm == &dev_priv->mm.aliasing_ppgtt->base);
5221 BUG_ON(list_empty(&o->vma_list));
5223 list_for_each_entry(vma, &o->vma_list, vma_link) {
5224 if (i915_is_ggtt(vma->vm) &&
5225 vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL)
5228 return vma->node.size;
5233 bool i915_gem_obj_is_pinned(struct drm_i915_gem_object *obj)
5235 struct i915_vma *vma;
5236 list_for_each_entry(vma, &obj->vma_list, vma_link)
5237 if (vma->pin_count > 0)
5243 /* Allocate a new GEM object and fill it with the supplied data */
5244 struct drm_i915_gem_object *
5245 i915_gem_object_create_from_data(struct drm_device *dev,
5246 const void *data, size_t size)
5248 struct drm_i915_gem_object *obj;
5249 struct sg_table *sg;
5253 obj = i915_gem_alloc_object(dev, round_up(size, PAGE_SIZE));
5254 if (IS_ERR_OR_NULL(obj))
5257 ret = i915_gem_object_set_to_cpu_domain(obj, true);
5261 ret = i915_gem_object_get_pages(obj);
5265 i915_gem_object_pin_pages(obj);
5267 bytes = sg_copy_from_buffer(sg->sgl, sg->nents, (void *)data, size);
5268 i915_gem_object_unpin_pages(obj);
5270 if (WARN_ON(bytes != size)) {
5271 DRM_ERROR("Incomplete copy, wrote %zu of %zu", bytes, size);
5279 drm_gem_object_unreference(&obj->base);
5280 return ERR_PTR(ret);