drivers/gpu/drm/msm/msm_fb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <robdclark@gmail.com>
   5  */
   6
   7 #include <drm/drm_crtc.h>
   8 #include <drm/drm_damage_helper.h>
   9 #include <drm/drm_file.h>
  10 #include <drm/drm_fourcc.h>
  11 #include <drm/drm_gem_framebuffer_helper.h>
  12 #include <drm/drm_probe_helper.h>
  13
  14 #include "msm_drv.h"
  15 #include "msm_kms.h"
  16 #include "msm_gem.h"
  17
  18 struct msm_framebuffer {
  19         struct drm_framebuffer base;
  20         const struct msm_format *format;
  21
  22         /* Count of # of attached planes which need dirtyfb: */
  23         refcount_t dirtyfb;
  24
  25         /* Framebuffer per-plane address, if pinned, else zero: */
  26         uint64_t iova[DRM_FORMAT_MAX_PLANES];
  27         atomic_t prepare_count;
  28 };
  29 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
  30
  31 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
  32                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);
  33
  34 static int msm_framebuffer_dirtyfb(struct drm_framebuffer *fb,
  35                                    struct drm_file *file_priv, unsigned int flags,
  36                                    unsigned int color, struct drm_clip_rect *clips,
  37                                    unsigned int num_clips)
  38 {
  39         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  40
  41         /* If this fb is not used on any display requiring pixel data to be
  42          * flushed, then skip dirtyfb
  43          */
  44         if (refcount_read(&msm_fb->dirtyfb) == 1)
  45                 return 0;
  46
  47         return drm_atomic_helper_dirtyfb(fb, file_priv, flags, color,
  48                                          clips, num_clips);
  49 }
  50
  51 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  52         .create_handle = drm_gem_fb_create_handle,
  53         .destroy = drm_gem_fb_destroy,
  54         .dirty = msm_framebuffer_dirtyfb,
  55 };
  56
  57 #ifdef CONFIG_DEBUG_FS
  58 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  59 {
  60         struct msm_gem_stats stats = {};
  61         int i, n = fb->format->num_planes;
  62
  63         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  64                         fb->width, fb->height, (char *)&fb->format->format,
  65                         drm_framebuffer_read_refcount(fb), fb->base.id);
  66
  67         for (i = 0; i < n; i++) {
  68                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  69                                 i, fb->offsets[i], fb->pitches[i]);
  70                 msm_gem_describe(fb->obj[i], m, &stats);
  71         }
  72 }
  73 #endif
  74
  75 /* prepare/pin all the fb's bo's for scanout.
  76  */
  77 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
  78                 struct msm_gem_address_space *aspace,
  79                 bool needs_dirtyfb)
  80 {
  81         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  82         int ret, i, n = fb->format->num_planes;
  83
  84         if (needs_dirtyfb)
  85                 refcount_inc(&msm_fb->dirtyfb);
  86
  87         atomic_inc(&msm_fb->prepare_count);
  88
  89         for (i = 0; i < n; i++) {
  90                 ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &msm_fb->iova[i]);
  91                 drm_dbg_state(fb->dev, "FB[%u]: iova[%d]: %08llx (%d)",
  92                               fb->base.id, i, msm_fb->iova[i], ret);
  93                 if (ret)
  94                         return ret;
  95         }
  96
  97         return 0;
  98 }
  99
 100 void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
 101                 struct msm_gem_address_space *aspace,
 102                 bool needed_dirtyfb)
 103 {
 104         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 105         int i, n = fb->format->num_planes;
 106
 107         if (needed_dirtyfb)
 108                 refcount_dec(&msm_fb->dirtyfb);
 109
 110         for (i = 0; i < n; i++)
 111                 msm_gem_unpin_iova(fb->obj[i], aspace);
 112
 113         if (!atomic_dec_return(&msm_fb->prepare_count))
 114                 memset(msm_fb->iova, 0, sizeof(msm_fb->iova));
 115 }
 116
 117 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
 118                 struct msm_gem_address_space *aspace, int plane)
 119 {
 120         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 121         return msm_fb->iova[plane] + fb->offsets[plane];
 122 }
 123
 124 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
 125 {
 126         return drm_gem_fb_get_obj(fb, plane);
 127 }
 128
 129 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
 130 {
 131         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
 132         return msm_fb->format;
 133 }
 134
 135 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 136                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 137 {
 138         const struct drm_format_info *info = drm_get_format_info(dev,
 139                                                                  mode_cmd);
 140         struct drm_gem_object *bos[4] = {0};
 141         struct drm_framebuffer *fb;
 142         int ret, i, n = info->num_planes;
 143
 144         for (i = 0; i < n; i++) {
 145                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 146                 if (!bos[i]) {
 147                         ret = -ENXIO;
 148                         goto out_unref;
 149                 }
 150         }
 151
 152         fb = msm_framebuffer_init(dev, mode_cmd, bos);
 153         if (IS_ERR(fb)) {
 154                 ret = PTR_ERR(fb);
 155                 goto out_unref;
 156         }
 157
 158         return fb;
 159
 160 out_unref:
 161         for (i = 0; i < n; i++)
 162                 drm_gem_object_put(bos[i]);
 163         return ERR_PTR(ret);
 164 }
 165
 166 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 167                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 168 {
 169         const struct drm_format_info *info = drm_get_format_info(dev,
 170                                                                  mode_cmd);
 171         struct msm_drm_private *priv = dev->dev_private;
 172         struct msm_kms *kms = priv->kms;
 173         struct msm_framebuffer *msm_fb = NULL;
 174         struct drm_framebuffer *fb;
 175         const struct msm_format *format;
 176         int ret, i, n;
 177
 178         drm_dbg_state(dev, "create framebuffer: mode_cmd=%p (%dx%d@%4.4s)",
 179                         mode_cmd, mode_cmd->width, mode_cmd->height,
 180                         (char *)&mode_cmd->pixel_format);
 181
 182         n = info->num_planes;
 183         format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
 184                         mode_cmd->modifier[0]);
 185         if (!format) {
 186                 DRM_DEV_ERROR(dev->dev, "unsupported pixel format: %4.4s\n",
 187                                 (char *)&mode_cmd->pixel_format);
 188                 ret = -EINVAL;
 189                 goto fail;
 190         }
 191
 192         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 193         if (!msm_fb) {
 194                 ret = -ENOMEM;
 195                 goto fail;
 196         }
 197
 198         fb = &msm_fb->base;
 199
 200         msm_fb->format = format;
 201
 202         if (n > ARRAY_SIZE(fb->obj)) {
 203                 ret = -EINVAL;
 204                 goto fail;
 205         }
 206
 207         for (i = 0; i < n; i++) {
 208                 unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
 209                 unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
 210                 unsigned int min_size;
 211
 212                 min_size = (height - 1) * mode_cmd->pitches[i]
 213                          + width * info->cpp[i]
 214                          + mode_cmd->offsets[i];
 215
 216                 if (bos[i]->size < min_size) {
 217                         ret = -EINVAL;
 218                         goto fail;
 219                 }
 220
 221                 msm_fb->base.obj[i] = bos[i];
 222         }
 223
 224         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 225
 226         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 227         if (ret) {
 228                 DRM_DEV_ERROR(dev->dev, "framebuffer init failed: %d\n", ret);
 229                 goto fail;
 230         }
 231
 232         refcount_set(&msm_fb->dirtyfb, 1);
 233
 234         drm_dbg_state(dev, "create: FB ID: %d (%p)", fb->base.id, fb);
 235
 236         return fb;
 237
 238 fail:
 239         kfree(msm_fb);
 240
 241         return ERR_PTR(ret);
 242 }
 243
 244 struct drm_framebuffer *
 245 msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
 246 {
 247         struct drm_mode_fb_cmd2 mode_cmd = {
 248                 .pixel_format = format,
 249                 .width = w,
 250                 .height = h,
 251                 .pitches = { p },
 252         };
 253         struct drm_gem_object *bo;
 254         struct drm_framebuffer *fb;
 255         int size;
 256
 257         /* allocate backing bo */
 258         size = mode_cmd.pitches[0] * mode_cmd.height;
 259         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 260         bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
 261         if (IS_ERR(bo)) {
 262                 dev_warn(dev->dev, "could not allocate stolen bo\n");
 263                 /* try regular bo: */
 264                 bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
 265         }
 266         if (IS_ERR(bo)) {
 267                 DRM_DEV_ERROR(dev->dev, "failed to allocate buffer object\n");
 268                 return ERR_CAST(bo);
 269         }
 270
 271         msm_gem_object_set_name(bo, "stolenfb");
 272
 273         fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
 274         if (IS_ERR(fb)) {
 275                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
 276                 /* note: if fb creation failed, we can't rely on fb destroy
 277                  * to unref the bo:
 278                  */
 279                 drm_gem_object_put(bo);
 280                 return ERR_CAST(fb);
 281         }
 282
 283         return fb;
 284 }