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 #define to_msm_framebuffer(x) container_of(x, struct msm_framebuffer, base)
  23
  24 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
  25                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos);
  26
  27 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
  28         .create_handle = drm_gem_fb_create_handle,
  29         .destroy = drm_gem_fb_destroy,
  30         .dirty = drm_atomic_helper_dirtyfb,
  31 };
  32
  33 #ifdef CONFIG_DEBUG_FS
  34 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
  35 {
  36         int i, n = fb->format->num_planes;
  37
  38         seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
  39                         fb->width, fb->height, (char *)&fb->format->format,
  40                         drm_framebuffer_read_refcount(fb), fb->base.id);
  41
  42         for (i = 0; i < n; i++) {
  43                 seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
  44                                 i, fb->offsets[i], fb->pitches[i]);
  45                 msm_gem_describe(fb->obj[i], m);
  46         }
  47 }
  48 #endif
  49
  50 /* prepare/pin all the fb's bo's for scanout.  Note that it is not valid
  51  * to prepare an fb more multiple different initiator 'id's.  But that
  52  * should be fine, since only the scanout (mdpN) side of things needs
  53  * this, the gpu doesn't care about fb's.
  54  */
  55 int msm_framebuffer_prepare(struct drm_framebuffer *fb,
  56                 struct msm_gem_address_space *aspace)
  57 {
  58         int ret, i, n = fb->format->num_planes;
  59         uint64_t iova;
  60
  61         for (i = 0; i < n; i++) {
  62                 ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &iova);
  63                 DBG("FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
  64                 if (ret)
  65                         return ret;
  66         }
  67
  68         return 0;
  69 }
  70
  71 void msm_framebuffer_cleanup(struct drm_framebuffer *fb,
  72                 struct msm_gem_address_space *aspace)
  73 {
  74         int i, n = fb->format->num_planes;
  75
  76         for (i = 0; i < n; i++)
  77                 msm_gem_unpin_iova(fb->obj[i], aspace);
  78 }
  79
  80 uint32_t msm_framebuffer_iova(struct drm_framebuffer *fb,
  81                 struct msm_gem_address_space *aspace, int plane)
  82 {
  83         if (!fb->obj[plane])
  84                 return 0;
  85         return msm_gem_iova(fb->obj[plane], aspace) + fb->offsets[plane];
  86 }
  87
  88 struct drm_gem_object *msm_framebuffer_bo(struct drm_framebuffer *fb, int plane)
  89 {
  90         return drm_gem_fb_get_obj(fb, plane);
  91 }
  92
  93 const struct msm_format *msm_framebuffer_format(struct drm_framebuffer *fb)
  94 {
  95         struct msm_framebuffer *msm_fb = to_msm_framebuffer(fb);
  96         return msm_fb->format;
  97 }
  98
  99 struct drm_framebuffer *msm_framebuffer_create(struct drm_device *dev,
 100                 struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
 101 {
 102         const struct drm_format_info *info = drm_get_format_info(dev,
 103                                                                  mode_cmd);
 104         struct drm_gem_object *bos[4] = {0};
 105         struct drm_framebuffer *fb;
 106         int ret, i, n = info->num_planes;
 107
 108         for (i = 0; i < n; i++) {
 109                 bos[i] = drm_gem_object_lookup(file, mode_cmd->handles[i]);
 110                 if (!bos[i]) {
 111                         ret = -ENXIO;
 112                         goto out_unref;
 113                 }
 114         }
 115
 116         fb = msm_framebuffer_init(dev, mode_cmd, bos);
 117         if (IS_ERR(fb)) {
 118                 ret = PTR_ERR(fb);
 119                 goto out_unref;
 120         }
 121
 122         return fb;
 123
 124 out_unref:
 125         for (i = 0; i < n; i++)
 126                 drm_gem_object_put(bos[i]);
 127         return ERR_PTR(ret);
 128 }
 129
 130 static struct drm_framebuffer *msm_framebuffer_init(struct drm_device *dev,
 131                 const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
 132 {
 133         const struct drm_format_info *info = drm_get_format_info(dev,
 134                                                                  mode_cmd);
 135         struct msm_drm_private *priv = dev->dev_private;
 136         struct msm_kms *kms = priv->kms;
 137         struct msm_framebuffer *msm_fb = NULL;
 138         struct drm_framebuffer *fb;
 139         const struct msm_format *format;
 140         int ret, i, n;
 141
 142         DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
 143                         dev, mode_cmd, mode_cmd->width, mode_cmd->height,
 144                         (char *)&mode_cmd->pixel_format);
 145
 146         n = info->num_planes;
 147         format = kms->funcs->get_format(kms, mode_cmd->pixel_format,
 148                         mode_cmd->modifier[0]);
 149         if (!format) {
 150                 DRM_DEV_ERROR(dev->dev, "unsupported pixel format: %4.4s\n",
 151                                 (char *)&mode_cmd->pixel_format);
 152                 ret = -EINVAL;
 153                 goto fail;
 154         }
 155
 156         msm_fb = kzalloc(sizeof(*msm_fb), GFP_KERNEL);
 157         if (!msm_fb) {
 158                 ret = -ENOMEM;
 159                 goto fail;
 160         }
 161
 162         fb = &msm_fb->base;
 163
 164         msm_fb->format = format;
 165
 166         if (n > ARRAY_SIZE(fb->obj)) {
 167                 ret = -EINVAL;
 168                 goto fail;
 169         }
 170
 171         for (i = 0; i < n; i++) {
 172                 unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
 173                 unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
 174                 unsigned int min_size;
 175
 176                 min_size = (height - 1) * mode_cmd->pitches[i]
 177                          + width * info->cpp[i]
 178                          + mode_cmd->offsets[i];
 179
 180                 if (bos[i]->size < min_size) {
 181                         ret = -EINVAL;
 182                         goto fail;
 183                 }
 184
 185                 msm_fb->base.obj[i] = bos[i];
 186         }
 187
 188         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 189
 190         ret = drm_framebuffer_init(dev, fb, &msm_framebuffer_funcs);
 191         if (ret) {
 192                 DRM_DEV_ERROR(dev->dev, "framebuffer init failed: %d\n", ret);
 193                 goto fail;
 194         }
 195
 196         DBG("create: FB ID: %d (%p)", fb->base.id, fb);
 197
 198         return fb;
 199
 200 fail:
 201         kfree(msm_fb);
 202
 203         return ERR_PTR(ret);
 204 }
 205
 206 struct drm_framebuffer *
 207 msm_alloc_stolen_fb(struct drm_device *dev, int w, int h, int p, uint32_t format)
 208 {
 209         struct drm_mode_fb_cmd2 mode_cmd = {
 210                 .pixel_format = format,
 211                 .width = w,
 212                 .height = h,
 213                 .pitches = { p },
 214         };
 215         struct drm_gem_object *bo;
 216         struct drm_framebuffer *fb;
 217         int size;
 218
 219         /* allocate backing bo */
 220         size = mode_cmd.pitches[0] * mode_cmd.height;
 221         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 222         bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN);
 223         if (IS_ERR(bo)) {
 224                 dev_warn(dev->dev, "could not allocate stolen bo\n");
 225                 /* try regular bo: */
 226                 bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
 227         }
 228         if (IS_ERR(bo)) {
 229                 DRM_DEV_ERROR(dev->dev, "failed to allocate buffer object\n");
 230                 return ERR_CAST(bo);
 231         }
 232
 233         msm_gem_object_set_name(bo, "stolenfb");
 234
 235         fb = msm_framebuffer_init(dev, &mode_cmd, &bo);
 236         if (IS_ERR(fb)) {
 237                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
 238                 /* note: if fb creation failed, we can't rely on fb destroy
 239                  * to unref the bo:
 240                  */
 241                 drm_gem_object_put(bo);
 242                 return ERR_CAST(fb);
 243         }
 244
 245         return fb;
 246 }