drm/i915: Disable all outputs early, before KMS takeover

If the outputs are active and continuing to access the GATT when we
teardown the PTEs, then there is a potential for us to hang the GPU.
The hang tends to be a PGTBL_ER with either an invalid host access or
an invalid display plane fetch.

v2: Reorder IRQ initialisation to defer until after GEM is setup.

Reported-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Daniel Vetter <daniel.vetter@ffwll.ch> (855GM)
Tested-by: Pekka Enberg <penberg@kernel.org>
           # note that this doesn't fix the underlying problem of the
             PGTBL_ER and pipe underruns being reported immediately upon
             init on his 965GM MacBook
Reported-and-tested-by: Rick Bramley <richard.bramley@hp.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35635
Reported-and-tested-by: Zdenek Kabelac <zdenek.kabelac@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36048
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>

3 files changed, 34 insertions, 15 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 64c6f67777f8..01ca0e97bebf 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1176,11 +1176,11 @@ static bool i915_switcheroo_can_switch(struct pci_dev *pdev)
         return can_switch;
 }
 
-static int i915_load_modeset_init(struct drm_device *dev)
+static int i915_load_gem_init(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
         unsigned long prealloc_size, gtt_size, mappable_size;
-        int ret = 0;
+        int ret;
 
         prealloc_size = dev_priv->mm.gtt->stolen_size;
         gtt_size = dev_priv->mm.gtt->gtt_total_entries << PAGE_SHIFT;
@@ -1204,7 +1204,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
         ret = i915_gem_init_ringbuffer(dev);
         mutex_unlock(&dev->struct_mutex);
         if (ret)
-                goto out;
+                return ret;
 
         /* Try to set up FBC with a reasonable compressed buffer size */
         if (I915_HAS_FBC(dev) && i915_powersave) {
@@ -1222,6 +1222,13 @@ static int i915_load_modeset_init(struct drm_device *dev)
 
         /* Allow hardware batchbuffers unless told otherwise. */
         dev_priv->allow_batchbuffer = 1;
+        return 0;
+}
+
+static int i915_load_modeset_init(struct drm_device *dev)
+{
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        int ret;
 
         ret = intel_parse_bios(dev);
         if (ret)
@@ -1236,7 +1243,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
          */
         ret = vga_client_register(dev->pdev, dev, NULL, i915_vga_set_decode);
         if (ret && ret != -ENODEV)
-                goto cleanup_ringbuffer;
+                goto out;
 
         intel_register_dsm_handler();
 
@@ -1253,10 +1260,16 @@ static int i915_load_modeset_init(struct drm_device *dev)
 
         intel_modeset_init(dev);
 
-        ret = drm_irq_install(dev);
+        ret = i915_load_gem_init(dev);
         if (ret)
                 goto cleanup_vga_switcheroo;
 
+        intel_modeset_gem_init(dev);
+
+        ret = drm_irq_install(dev);
+        if (ret)
+                goto cleanup_gem;
+
         /* Always safe in the mode setting case. */
         /* FIXME: do pre/post-mode set stuff in core KMS code */
         dev->vblank_disable_allowed = 1;
@@ -1274,14 +1287,14 @@ static int i915_load_modeset_init(struct drm_device *dev)
 
 cleanup_irq:
         drm_irq_uninstall(dev);
+cleanup_gem:
+        mutex_lock(&dev->struct_mutex);
+        i915_gem_cleanup_ringbuffer(dev);
+        mutex_unlock(&dev->struct_mutex);
 cleanup_vga_switcheroo:
         vga_switcheroo_unregister_client(dev->pdev);
 cleanup_vga_client:
         vga_client_register(dev->pdev, NULL, NULL, NULL);
-cleanup_ringbuffer:
-        mutex_lock(&dev->struct_mutex);
-        i915_gem_cleanup_ringbuffer(dev);
-        mutex_unlock(&dev->struct_mutex);
 out:
         return ret;
 }
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7a791f8a92bb..4b862f366904 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1277,6 +1277,7 @@ static inline void intel_unregister_dsm_handler(void) { return; }
 
 /* modesetting */
 extern void intel_modeset_init(struct drm_device *dev);
+extern void intel_modeset_gem_init(struct drm_device *dev);
 extern void intel_modeset_cleanup(struct drm_device *dev);
 extern int intel_modeset_vga_set_state(struct drm_device *dev, bool state);
 extern void i8xx_disable_fbc(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e99ae3bd1064..a38fb3998ad1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6627,6 +6627,9 @@ static void intel_setup_outputs(struct drm_device *dev)
         }
 
         intel_panel_setup_backlight(dev);
+
+        /* disable all the possible outputs/crtcs before entering KMS mode */
+        drm_helper_disable_unused_functions(dev);
 }
 
 static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
@@ -7573,13 +7576,12 @@ void intel_modeset_init(struct drm_device *dev)
                 intel_crtc_init(dev, i);
         }
 
+        /* Just disable it once at startup */
+        i915_disable_vga(dev);
         intel_setup_outputs(dev);
 
         intel_enable_clock_gating(dev);
 
-        /* Just disable it once at startup */
-        i915_disable_vga(dev);
-
         if (IS_IRONLAKE_M(dev)) {
                 ironlake_enable_drps(dev);
                 intel_init_emon(dev);
@@ -7588,12 +7590,15 @@ void intel_modeset_init(struct drm_device *dev)
         if (IS_GEN6(dev))
                 gen6_enable_rps(dev_priv);
 
-        if (IS_IRONLAKE_M(dev))
-                ironlake_enable_rc6(dev);
-
         INIT_WORK(&dev_priv->idle_work, intel_idle_update);
         setup_timer(&dev_priv->idle_timer, intel_gpu_idle_timer,
                     (unsigned long)dev);
+}
+
+void intel_modeset_gem_init(struct drm_device *dev)
+{
+        if (IS_IRONLAKE_M(dev))
+                ironlake_enable_rc6(dev);
 
         intel_setup_overlay(dev);
 }