2 * Copyright 2003 José Fonseca.
3 * Copyright 2003 Leif Delgass.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 #include <linux/pci.h>
26 #include <linux/slab.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/export.h>
29 #include <drm/drm_pci.h>
31 #include "drm_internal.h"
32 #include "drm_legacy.h"
35 * drm_pci_alloc - Allocate a PCI consistent memory block, for DMA.
37 * @size: size of block to allocate
38 * @align: alignment of block
40 * FIXME: This is a needless abstraction of the Linux dma-api and should be
43 * Return: A handle to the allocated memory block on success or NULL on
46 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
48 drm_dma_handle_t *dmah;
50 /* pci_alloc_consistent only guarantees alignment to the smallest
51 * PAGE_SIZE order which is greater than or equal to the requested size.
52 * Return NULL here for now to make sure nobody tries for larger alignment
57 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
62 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL);
64 if (dmah->vaddr == NULL) {
72 EXPORT_SYMBOL(drm_pci_alloc);
75 * Free a PCI consistent memory block without freeing its descriptor.
77 * This function is for internal use in the Linux-specific DRM core code.
79 void __drm_legacy_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
82 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
87 * drm_pci_free - Free a PCI consistent memory block
89 * @dmah: handle to memory block
91 * FIXME: This is a needless abstraction of the Linux dma-api and should be
94 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
96 __drm_legacy_pci_free(dev, dmah);
100 EXPORT_SYMBOL(drm_pci_free);
104 static int drm_get_pci_domain(struct drm_device *dev)
107 /* For historical reasons, drm_get_pci_domain() is busticated
108 * on most archs and has to remain so for userspace interface
109 * < 1.4, except on alpha which was right from the beginning
111 if (dev->if_version < 0x10004)
113 #endif /* __alpha__ */
115 return pci_domain_nr(dev->pdev->bus);
118 int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
120 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d",
121 drm_get_pci_domain(dev),
122 dev->pdev->bus->number,
123 PCI_SLOT(dev->pdev->devfn),
124 PCI_FUNC(dev->pdev->devfn));
128 master->unique_len = strlen(master->unique);
132 static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
134 if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
135 (p->busnum & 0xff) != dev->pdev->bus->number ||
136 p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn))
139 p->irq = dev->pdev->irq;
141 DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
147 * drm_irq_by_busid - Get interrupt from bus ID
149 * @data: IOCTL parameter pointing to a drm_irq_busid structure
150 * @file_priv: DRM file private.
152 * Finds the PCI device with the specified bus id and gets its IRQ number.
153 * This IOCTL is deprecated, and will now return EINVAL for any busid not equal
154 * to that of the device that this DRM instance attached to.
156 * Return: 0 on success or a negative error code on failure.
158 int drm_irq_by_busid(struct drm_device *dev, void *data,
159 struct drm_file *file_priv)
161 struct drm_irq_busid *p = data;
163 if (!drm_core_check_feature(dev, DRIVER_LEGACY))
166 /* UMS was only ever support on PCI devices. */
167 if (WARN_ON(!dev->pdev))
170 if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
173 return drm_pci_irq_by_busid(dev, p);
176 static void drm_pci_agp_init(struct drm_device *dev)
178 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
179 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
180 dev->agp = drm_agp_init(dev);
182 dev->agp->agp_mtrr = arch_phys_wc_add(
183 dev->agp->agp_info.aper_base,
184 dev->agp->agp_info.aper_size *
190 void drm_pci_agp_destroy(struct drm_device *dev)
193 arch_phys_wc_del(dev->agp->agp_mtrr);
194 drm_legacy_agp_clear(dev);
201 * drm_get_pci_dev - Register a PCI device with the DRM subsystem
203 * @ent: entry from the PCI ID table that matches @pdev
204 * @driver: DRM device driver
206 * Attempt to gets inter module "drm" information. If we are first
207 * then register the character device and inter module information.
208 * Try and register, if we fail to register, backout previous work.
210 * NOTE: This function is deprecated, please use drm_dev_alloc() and
211 * drm_dev_register() instead and remove your &drm_driver.load callback.
213 * Return: 0 on success or a negative error code on failure.
215 int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
216 struct drm_driver *driver)
218 struct drm_device *dev;
223 dev = drm_dev_alloc(driver, &pdev->dev);
227 ret = pci_enable_device(pdev);
233 dev->hose = pdev->sysdata;
236 if (drm_core_check_feature(dev, DRIVER_MODESET))
237 pci_set_drvdata(pdev, dev);
239 drm_pci_agp_init(dev);
241 ret = drm_dev_register(dev, ent->driver_data);
245 /* No locking needed since shadow-attach is single-threaded since it may
246 * only be called from the per-driver module init hook. */
247 if (drm_core_check_feature(dev, DRIVER_LEGACY))
248 list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
253 drm_pci_agp_destroy(dev);
254 pci_disable_device(pdev);
259 EXPORT_SYMBOL(drm_get_pci_dev);
262 * drm_legacy_pci_init - shadow-attach a legacy DRM PCI driver
263 * @driver: DRM device driver
264 * @pdriver: PCI device driver
266 * This is only used by legacy dri1 drivers and deprecated.
268 * Return: 0 on success or a negative error code on failure.
270 int drm_legacy_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
272 struct pci_dev *pdev = NULL;
273 const struct pci_device_id *pid;
278 if (WARN_ON(!(driver->driver_features & DRIVER_LEGACY)))
281 /* If not using KMS, fall back to stealth mode manual scanning. */
282 INIT_LIST_HEAD(&driver->legacy_dev_list);
283 for (i = 0; pdriver->id_table[i].vendor != 0; i++) {
284 pid = &pdriver->id_table[i];
286 /* Loop around setting up a DRM device for each PCI device
287 * matching our ID and device class. If we had the internal
288 * function that pci_get_subsys and pci_get_class used, we'd
289 * be able to just pass pid in instead of doing a two-stage
294 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
295 pid->subdevice, pdev)) != NULL) {
296 if ((pdev->class & pid->class_mask) != pid->class)
299 /* stealth mode requires a manual probe */
301 drm_get_pci_dev(pdev, pid, driver);
306 EXPORT_SYMBOL(drm_legacy_pci_init);
308 int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
310 struct pci_dev *root;
317 root = dev->pdev->bus->self;
319 /* we've been informed via and serverworks don't make the cut */
320 if (root->vendor == PCI_VENDOR_ID_VIA ||
321 root->vendor == PCI_VENDOR_ID_SERVERWORKS)
324 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
325 pcie_capability_read_dword(root, PCI_EXP_LNKCAP2, &lnkcap2);
327 if (lnkcap2) { /* PCIe r3.0-compliant */
328 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
329 *mask |= DRM_PCIE_SPEED_25;
330 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
331 *mask |= DRM_PCIE_SPEED_50;
332 if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
333 *mask |= DRM_PCIE_SPEED_80;
334 } else { /* pre-r3.0 */
335 if (lnkcap & PCI_EXP_LNKCAP_SLS_2_5GB)
336 *mask |= DRM_PCIE_SPEED_25;
337 if (lnkcap & PCI_EXP_LNKCAP_SLS_5_0GB)
338 *mask |= (DRM_PCIE_SPEED_25 | DRM_PCIE_SPEED_50);
341 DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2);
344 EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
346 int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw)
348 struct pci_dev *root;
355 root = dev->pdev->bus->self;
357 pcie_capability_read_dword(root, PCI_EXP_LNKCAP, &lnkcap);
359 *mlw = (lnkcap & PCI_EXP_LNKCAP_MLW) >> 4;
361 DRM_INFO("probing mlw for device %x:%x = %x\n", root->vendor, root->device, lnkcap);
364 EXPORT_SYMBOL(drm_pcie_get_max_link_width);
368 void drm_pci_agp_destroy(struct drm_device *dev) {}
370 int drm_irq_by_busid(struct drm_device *dev, void *data,
371 struct drm_file *file_priv)
378 * drm_legacy_pci_exit - unregister shadow-attach legacy DRM driver
379 * @driver: DRM device driver
380 * @pdriver: PCI device driver
382 * Unregister a DRM driver shadow-attached through drm_legacy_pci_init(). This
383 * is deprecated and only used by dri1 drivers.
385 void drm_legacy_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver)
387 struct drm_device *dev, *tmp;
390 if (!(driver->driver_features & DRIVER_LEGACY)) {
393 list_for_each_entry_safe(dev, tmp, &driver->legacy_dev_list,
395 list_del(&dev->legacy_dev_list);
399 DRM_INFO("Module unloaded\n");
401 EXPORT_SYMBOL(drm_legacy_pci_exit);