drm/i915: Make use of intel_fb_obj() (v2)

This should hopefully simplify the display code slightly and also
solves at least one mistake in intel_pipe_set_base() where
to_intel_framebuffer(fb)->obj is referenced during local variable
initialization, before 'if (!fb)' gets checked.

Potential uses of this macro were identified via the following
Coccinelle patch:

        @@
        expression E;
        @@
        * to_intel_framebuffer(E)->obj

        @@
        expression E;
        identifier I;
        @@
          I = to_intel_framebuffer(E);
          ...
        * I->obj

v2: Rewrite some NULL tests in terms of the obj rather than the fb.
    Also add a WARN() if trying to pageflip with a disabled primary
    plane.  [Suggested by Chris Wilson]

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 48 insertions, 63 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8e738d4315a8..71430a05ba89 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2356,7 +2356,7 @@ static void intel_find_plane_obj(struct intel_crtc *intel_crtc,
         struct drm_device *dev = intel_crtc->base.dev;
         struct drm_crtc *c;
         struct intel_crtc *i;
-        struct intel_framebuffer *fb;
+        struct drm_i915_gem_object *obj;
 
         if (!intel_crtc->base.primary->fb)
                 return;
@@ -2377,14 +2377,17 @@ static void intel_find_plane_obj(struct intel_crtc *intel_crtc,
                 if (c == &intel_crtc->base)
                         continue;
 
-                if (!i->active || !c->primary->fb)
+                if (!i->active)
+                        continue;
+
+                obj = intel_fb_obj(c->primary->fb);
+                if (obj == NULL)
                         continue;
 
-                fb = to_intel_framebuffer(c->primary->fb);
-                if (i915_gem_obj_ggtt_offset(fb->obj) == plane_config->base) {
+                if (i915_gem_obj_ggtt_offset(obj) == plane_config->base) {
                         drm_framebuffer_reference(c->primary->fb);
                         intel_crtc->base.primary->fb = c->primary->fb;
-                        fb->obj->frontbuffer_bits |= INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
+                        obj->frontbuffer_bits |= INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
                         break;
                 }
         }
@@ -2397,16 +2400,12 @@ static void i9xx_update_primary_plane(struct drm_crtc *crtc,
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-        struct intel_framebuffer *intel_fb;
-        struct drm_i915_gem_object *obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
         int plane = intel_crtc->plane;
         unsigned long linear_offset;
         u32 dspcntr;
         u32 reg;
 
-        intel_fb = to_intel_framebuffer(fb);
-        obj = intel_fb->obj;
-
         reg = DSPCNTR(plane);
         dspcntr = I915_READ(reg);
         /* Mask out pixel format bits in case we change it */
@@ -2487,16 +2486,12 @@ static void ironlake_update_primary_plane(struct drm_crtc *crtc,
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-        struct intel_framebuffer *intel_fb;
-        struct drm_i915_gem_object *obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
         int plane = intel_crtc->plane;
         unsigned long linear_offset;
         u32 dspcntr;
         u32 reg;
 
-        intel_fb = to_intel_framebuffer(fb);
-        obj = intel_fb->obj;
-
         reg = DSPCNTR(plane);
         dspcntr = I915_READ(reg);
         /* Mask out pixel format bits in case we change it */
@@ -2627,7 +2622,7 @@ void intel_display_handle_reset(struct drm_device *dev)
 static int
 intel_finish_fb(struct drm_framebuffer *old_fb)
 {
-        struct drm_i915_gem_object *obj = to_intel_framebuffer(old_fb)->obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(old_fb);
         struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
         bool was_interruptible = dev_priv->mm.interruptible;
         int ret;
@@ -2674,9 +2669,9 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         enum pipe pipe = intel_crtc->pipe;
-        struct drm_framebuffer *old_fb;
-        struct drm_i915_gem_object *obj = to_intel_framebuffer(fb)->obj;
-        struct drm_i915_gem_object *old_obj;
+        struct drm_framebuffer *old_fb = crtc->primary->fb;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+        struct drm_i915_gem_object *old_obj = intel_fb_obj(old_fb);
         int ret;
 
         if (intel_crtc_has_pending_flip(crtc)) {
@@ -2697,9 +2692,6 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
                 return -EINVAL;
         }
 
-        old_fb = crtc->primary->fb;
-        old_obj = old_fb ? to_intel_framebuffer(old_fb)->obj : NULL;
-
         mutex_lock(&dev->struct_mutex);
         ret = intel_pin_and_fence_fb_obj(dev, obj, NULL);
         if (ret == 0)
@@ -2755,7 +2747,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
                 if (intel_crtc->active && old_fb != fb)
                         intel_wait_for_vblank(dev, intel_crtc->pipe);
                 mutex_lock(&dev->struct_mutex);
-                intel_unpin_fb_obj(to_intel_framebuffer(old_fb)->obj);
+                intel_unpin_fb_obj(old_obj);
                 mutex_unlock(&dev->struct_mutex);
         }
 
@@ -4929,7 +4921,7 @@ static void intel_crtc_disable(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct drm_connector *connector;
         struct drm_i915_private *dev_priv = dev->dev_private;
-        struct drm_i915_gem_object *old_obj;
+        struct drm_i915_gem_object *old_obj = intel_fb_obj(crtc->primary->fb);
         enum pipe pipe = to_intel_crtc(crtc)->pipe;
 
         /* crtc should still be enabled when we disable it. */
@@ -4944,7 +4936,6 @@ static void intel_crtc_disable(struct drm_crtc *crtc)
         assert_pipe_disabled(dev->dev_private, pipe);
 
         if (crtc->primary->fb) {
-                old_obj = to_intel_framebuffer(crtc->primary->fb)->obj;
                 mutex_lock(&dev->struct_mutex);
                 intel_unpin_fb_obj(old_obj);
                 i915_gem_track_fb(old_obj, NULL,
@@ -9586,7 +9577,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_framebuffer *old_fb = crtc->primary->fb;
-        struct drm_i915_gem_object *obj = to_intel_framebuffer(fb)->obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         enum pipe pipe = intel_crtc->pipe;
         struct intel_unpin_work *work;
@@ -9594,6 +9585,14 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
         unsigned long flags;
         int ret;
 
+        /*
+         * drm_mode_page_flip_ioctl() should already catch this, but double
+         * check to be safe.  In the future we may enable pageflipping from
+         * a disabled primary plane.
+         */
+        if (WARN_ON(intel_fb_obj(old_fb) == NULL))
+                return -EBUSY;
+
         /* Can't change pixel format via MI display flips. */
         if (fb->pixel_format != crtc->primary->fb->pixel_format)
                 return -EINVAL;
@@ -9616,7 +9615,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 
         work->event = event;
         work->crtc = crtc;
-        work->old_fb_obj = to_intel_framebuffer(old_fb)->obj;
+        work->old_fb_obj = intel_fb_obj(old_fb);
         INIT_WORK(&work->work, intel_unpin_work_fn);
 
         ret = drm_crtc_vblank_get(crtc);
@@ -10758,10 +10757,9 @@ static int __intel_set_mode(struct drm_crtc *crtc,
          * on the DPLL.
          */
         for_each_intel_crtc_masked(dev, modeset_pipes, intel_crtc) {
-                struct drm_framebuffer *old_fb;
-                struct drm_i915_gem_object *old_obj = NULL;
-                struct drm_i915_gem_object *obj =
-                        to_intel_framebuffer(fb)->obj;
+                struct drm_framebuffer *old_fb = crtc->primary->fb;
+                struct drm_i915_gem_object *old_obj = intel_fb_obj(old_fb);
+                struct drm_i915_gem_object *obj = intel_fb_obj(fb);
 
                 mutex_lock(&dev->struct_mutex);
                 ret = intel_pin_and_fence_fb_obj(dev,
@@ -10772,11 +10770,8 @@ static int __intel_set_mode(struct drm_crtc *crtc,
                         mutex_unlock(&dev->struct_mutex);
                         goto done;
                 }
-                old_fb = crtc->primary->fb;
-                if (old_fb) {
-                        old_obj = to_intel_framebuffer(old_fb)->obj;
+                if (old_fb)
                         intel_unpin_fb_obj(old_obj);
-                }
                 i915_gem_track_fb(old_obj, obj,
                                   INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe));
                 mutex_unlock(&dev->struct_mutex);
@@ -11394,9 +11389,9 @@ intel_primary_plane_disable(struct drm_plane *plane)
         intel_disable_primary_hw_plane(dev_priv, intel_plane->plane,
                                        intel_plane->pipe);
 disable_unpin:
-        i915_gem_track_fb(to_intel_framebuffer(plane->fb)->obj, NULL,
+        i915_gem_track_fb(intel_fb_obj(plane->fb), NULL,
                           INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe));
-        intel_unpin_fb_obj(to_intel_framebuffer(plane->fb)->obj);
+        intel_unpin_fb_obj(intel_fb_obj(plane->fb));
         plane->fb = NULL;
 
         return 0;
@@ -11413,7 +11408,8 @@ intel_primary_plane_setplane(struct drm_plane *plane, struct drm_crtc *crtc,
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         struct intel_plane *intel_plane = to_intel_plane(plane);
-        struct drm_i915_gem_object *obj, *old_obj = NULL;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+        struct drm_i915_gem_object *old_obj = intel_fb_obj(plane->fb);
         struct drm_rect dest = {
                 /* integer pixels */
                 .x1 = crtc_x,
@@ -11445,10 +11441,6 @@ intel_primary_plane_setplane(struct drm_plane *plane, struct drm_crtc *crtc,
         if (ret)
                 return ret;
 
-        if (plane->fb)
-                old_obj = to_intel_framebuffer(plane->fb)->obj;
-        obj = to_intel_framebuffer(fb)->obj;
-
         /*
          * If the CRTC isn't enabled, we're just pinning the framebuffer,
          * updating the fb pointer, and returning without touching the
@@ -12945,7 +12937,7 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
 void intel_modeset_gem_init(struct drm_device *dev)
 {
         struct drm_crtc *c;
-        struct intel_framebuffer *fb;
+        struct drm_i915_gem_object *obj;
 
         mutex_lock(&dev->struct_mutex);
         intel_init_gt_powersave(dev);
@@ -12962,11 +12954,11 @@ void intel_modeset_gem_init(struct drm_device *dev)
          */
         mutex_lock(&dev->struct_mutex);
         for_each_crtc(dev, c) {
-                if (!c->primary->fb)
+                obj = intel_fb_obj(c->primary->fb);
+                if (obj == NULL)
                         continue;
 
-                fb = to_intel_framebuffer(c->primary->fb);
-                if (intel_pin_and_fence_fb_obj(dev, fb->obj, NULL)) {
+                if (intel_pin_and_fence_fb_obj(dev, obj, NULL)) {
                         DRM_ERROR("failed to pin boot fb on pipe %d\n",
                                   to_intel_crtc(c)->pipe);
                         drm_framebuffer_unreference(c->primary->fb);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e0f1bd125d85..3ca6c7c77e05 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1752,7 +1752,7 @@ static bool intel_edp_psr_match_conditions(struct intel_dp *intel_dp)
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_crtc *crtc = dig_port->base.base.crtc;
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-        struct drm_i915_gem_object *obj = to_intel_framebuffer(crtc->primary->fb)->obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(crtc->primary->fb);
         struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;
 
         dev_priv->psr.source_ok = false;
@@ -1785,7 +1785,6 @@ static bool intel_edp_psr_match_conditions(struct intel_dp *intel_dp)
                 return false;
         }
 
-        obj = to_intel_framebuffer(crtc->primary->fb)->obj;
         if (obj->tiling_mode != I915_TILING_X ||
             obj->fence_reg == I915_FENCE_REG_NONE) {
                 DRM_DEBUG_KMS("PSR condition failed: fb not tiled or fenced\n");
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d1af6419ec78..19c5c26badae 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -93,8 +93,7 @@ static void i8xx_enable_fbc(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_framebuffer *fb = crtc->primary->fb;
-        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
-        struct drm_i915_gem_object *obj = intel_fb->obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         int cfb_pitch;
         int i;
@@ -150,8 +149,7 @@ static void g4x_enable_fbc(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_framebuffer *fb = crtc->primary->fb;
-        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
-        struct drm_i915_gem_object *obj = intel_fb->obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         u32 dpfc_ctl;
 
@@ -222,8 +220,7 @@ static void ironlake_enable_fbc(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_framebuffer *fb = crtc->primary->fb;
-        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
-        struct drm_i915_gem_object *obj = intel_fb->obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         u32 dpfc_ctl;
 
@@ -289,8 +286,7 @@ static void gen7_enable_fbc(struct drm_crtc *crtc)
         struct drm_device *dev = crtc->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct drm_framebuffer *fb = crtc->primary->fb;
-        struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
-        struct drm_i915_gem_object *obj = intel_fb->obj;
+        struct drm_i915_gem_object *obj = intel_fb_obj(fb);
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         u32 dpfc_ctl;
 
@@ -485,7 +481,6 @@ void intel_update_fbc(struct drm_device *dev)
         struct drm_crtc *crtc = NULL, *tmp_crtc;
         struct intel_crtc *intel_crtc;
         struct drm_framebuffer *fb;
-        struct intel_framebuffer *intel_fb;
         struct drm_i915_gem_object *obj;
         const struct drm_display_mode *adjusted_mode;
         unsigned int max_width, max_height;
@@ -530,8 +525,7 @@ void intel_update_fbc(struct drm_device *dev)
 
         intel_crtc = to_intel_crtc(crtc);
         fb = crtc->primary->fb;
-        intel_fb = to_intel_framebuffer(fb);
-        obj = intel_fb->obj;
+        obj = intel_fb_obj(fb);
         adjusted_mode = &intel_crtc->config.adjusted_mode;
 
         if (i915.enable_fbc < 0) {
@@ -589,7 +583,7 @@ void intel_update_fbc(struct drm_device *dev)
         if (in_dbg_master())
                 goto out_disable;
 
-        if (i915_gem_stolen_setup_compression(dev, intel_fb->obj->base.size,
+        if (i915_gem_stolen_setup_compression(dev, obj->base.size,
                                               drm_format_plane_cpp(fb->pixel_format, 0))) {
                 if (set_no_fbc_reason(dev_priv, FBC_STOLEN_TOO_SMALL))
                         DRM_DEBUG_KMS("framebuffer too large, disabling compression\n");
@@ -1599,12 +1593,12 @@ static void i9xx_update_wm(struct drm_crtc *unused_crtc)
         DRM_DEBUG_KMS("FIFO watermarks - A: %d, B: %d\n", planea_wm, planeb_wm);
 
         if (IS_I915GM(dev) && enabled) {
-                struct intel_framebuffer *fb;
+                struct drm_i915_gem_object *obj;
 
-                fb = to_intel_framebuffer(enabled->primary->fb);
+                obj = intel_fb_obj(enabled->primary->fb);
 
                 /* self-refresh seems busted with untiled */
-                if (fb->obj->tiling_mode == I915_TILING_NONE)
+                if (obj->tiling_mode == I915_TILING_NONE)
                         enabled = NULL;
         }