drm: pin new and unpin old buffer when setting a mode.

This removes the requirement for user space to pin a buffer before
setting a mode that is backed by the pixels from that buffer.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

3 files changed, 55 insertions, 18 deletions

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index 58e335967617..d8a982b71296 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -432,7 +432,8 @@ static void drm_setup_crtcs(struct drm_device *dev)
  */
 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
                               struct drm_display_mode *mode,
-                              int x, int y)
+                              int x, int y,
+                              struct drm_framebuffer *old_fb)
 {
         struct drm_device *dev = crtc->dev;
         struct drm_display_mode *adjusted_mode, saved_mode;
@@ -462,7 +463,8 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
 
         if (drm_mode_equal(&saved_mode, &crtc->mode)) {
                 if (saved_x != crtc->x || saved_y != crtc->y) {
-                        crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y);
+                        crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y,
+                                                  old_fb);
                         goto done;
                 }
         }
@@ -501,7 +503,7 @@ bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
         /* Set up the DPLL and any encoders state that needs to adjust or depend
          * on the DPLL.
          */
-        crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y);
+        crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
 
         list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 
@@ -564,6 +566,7 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
         struct drm_device *dev;
         struct drm_crtc **save_crtcs, *new_crtc;
         struct drm_encoder **save_encoders, *new_encoder;
+        struct drm_framebuffer *old_fb;
         bool save_enabled;
         bool changed = false;
         bool flip_or_move = false;
@@ -684,13 +687,15 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
                 changed = true;
 
         if (changed) {
+                old_fb = set->crtc->fb;
                 set->crtc->fb = set->fb;
                 set->crtc->enabled = (set->mode != NULL);
                 if (set->mode != NULL) {
                         DRM_DEBUG("attempting to set mode from userspace\n");
                         drm_mode_debug_printmodeline(set->mode);
                         if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
-                                                      set->x, set->y)) {
+                                                      set->x, set->y,
+                                                      old_fb)) {
                                 ret = -EINVAL;
                                 goto fail_set_mode;
                         }
@@ -701,9 +706,10 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
                 }
                 drm_helper_disable_unused_functions(dev);
         } else if (flip_or_move) {
+                old_fb = set->crtc->fb;
                 if (set->crtc->fb != set->fb)
                         set->crtc->fb = set->fb;
-                crtc_funcs->mode_set_base(set->crtc, set->x, set->y);
+                crtc_funcs->mode_set_base(set->crtc, set->x, set->y, old_fb);
         }
 
         kfree(save_encoders);
@@ -809,8 +815,8 @@ int drm_helper_resume_force_mode(struct drm_device *dev)
                 if (!crtc->enabled)
                         continue;
 
-                ret = drm_crtc_helper_set_mode(crtc, &crtc->mode, crtc->x,
-                                               crtc->y);
+                ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
+                                               crtc->x, crtc->y, crtc->fb);
 
                 if (ret == false)
                         DRM_ERROR("failed to set mode on crtc %p\n", crtc);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6e8b9ab83e97..e5c1c80d1f90 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -344,7 +344,8 @@ intel_wait_for_vblank(struct drm_device *dev)
 }
 
 static void
-intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
+intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
+                    struct drm_framebuffer *old_fb)
 {
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -359,7 +360,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
         int dspsurf = (pipe == 0 ? DSPASURF : DSPBSURF);
         int dspstride = (pipe == 0) ? DSPASTRIDE : DSPBSTRIDE;
         int dspcntr_reg = (pipe == 0) ? DSPACNTR : DSPBCNTR;
-        u32 dspcntr;
+        u32 dspcntr, alignment;
 
         /* no fb bound */
         if (!crtc->fb) {
@@ -368,10 +369,32 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
         }
 
         intel_fb = to_intel_framebuffer(crtc->fb);
-
         obj = intel_fb->obj;
         obj_priv = obj->driver_private;
 
+        switch (obj_priv->tiling_mode) {
+        case I915_TILING_NONE:
+                alignment = 64 * 1024;
+                break;
+        case I915_TILING_X:
+                if (IS_I9XX(dev))
+                        alignment = 1024 * 1024;
+                else
+                        alignment = 512 * 1024;
+                break;
+        case I915_TILING_Y:
+                /* FIXME: Is this true? */
+                DRM_ERROR("Y tiled not allowed for scan out buffers\n");
+                return;
+        default:
+                BUG();
+        }
+
+        if (i915_gem_object_pin(intel_fb->obj, alignment))
+                return;
+
+        i915_gem_object_set_to_gtt_domain(intel_fb->obj, 1);
+
         Start = obj_priv->gtt_offset;
         Offset = y * crtc->fb->pitch + x * (crtc->fb->bits_per_pixel / 8);
 
@@ -409,6 +432,12 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y)
                 I915_READ(dspbase);
         }
 
+        intel_wait_for_vblank(dev);
+
+        if (old_fb) {
+                intel_fb = to_intel_framebuffer(old_fb);
+                i915_gem_object_unpin(intel_fb->obj);
+        }
 
         if (!dev->primary->master)
                 return;
@@ -680,7 +709,8 @@ static int intel_panel_fitter_pipe (struct drm_device *dev)
 static void intel_crtc_mode_set(struct drm_crtc *crtc,
                                 struct drm_display_mode *mode,
                                 struct drm_display_mode *adjusted_mode,
-                                int x, int y)
+                                int x, int y,
+                                struct drm_framebuffer *old_fb)
 {
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
@@ -915,9 +945,7 @@ static void intel_crtc_mode_set(struct drm_crtc *crtc,
         I915_WRITE(dspcntr_reg, dspcntr);
 
         /* Flush the plane changes */
-        intel_pipe_set_base(crtc, x, y);
-
-        intel_wait_for_vblank(dev);
+        intel_pipe_set_base(crtc, x, y, old_fb);
 
         drm_vblank_post_modeset(dev, pipe);
 }
@@ -1153,7 +1181,7 @@ struct drm_crtc *intel_get_load_detect_pipe(struct intel_output *intel_output,
         if (!crtc->enabled) {
                 if (!mode)
                         mode = &load_detect_mode;
-                drm_crtc_helper_set_mode(crtc, mode, 0, 0);
+                drm_crtc_helper_set_mode(crtc, mode, 0, 0, crtc->fb);
         } else {
                 if (intel_crtc->dpms_mode != DRM_MODE_DPMS_ON) {
                         crtc_funcs = crtc->helper_private;
diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
index a341828d1d15..4bc04cf460a7 100644
--- a/include/drm/drm_crtc_helper.h
+++ b/include/drm/drm_crtc_helper.h
@@ -55,10 +55,12 @@ struct drm_crtc_helper_funcs {
                            struct drm_display_mode *adjusted_mode);
         /* Actually set the mode */
         void (*mode_set)(struct drm_crtc *crtc, struct drm_display_mode *mode,
-                         struct drm_display_mode *adjusted_mode, int x, int y);
+                         struct drm_display_mode *adjusted_mode, int x, int y,
+                         struct drm_framebuffer *old_fb);
 
         /* Move the crtc on the current fb to the given position *optional* */
-        void (*mode_set_base)(struct drm_crtc *crtc, int x, int y);
+        void (*mode_set_base)(struct drm_crtc *crtc, int x, int y,
+                              struct drm_framebuffer *old_fb);
 };
 
 struct drm_encoder_helper_funcs {
@@ -93,7 +95,8 @@ extern bool drm_helper_initial_config(struct drm_device *dev, bool can_grow);
 extern int drm_crtc_helper_set_config(struct drm_mode_set *set);
 extern bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
                                      struct drm_display_mode *mode,
-                                     int x, int y);
+                                     int x, int y,
+                                     struct drm_framebuffer *old_fb);
 extern bool drm_helper_crtc_in_use(struct drm_crtc *crtc);
 
 extern int drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,