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Subject[PATCH] drm/i915: Disable all outputs early, before KMS takeover
Date
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.

Reported-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_dma.c | 31 ++++++++++++++++++++++---------
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++------
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 7273037..65d5adf 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();

@@ -1257,13 +1264,19 @@ static int i915_load_modeset_init(struct drm_device *dev)
if (ret)
goto cleanup_vga_switcheroo;

+ ret = i915_load_gem_init(dev);
+ if (ret)
+ goto cleanup_irq;
+
+ intel_modeset_gem_init(dev);
+
/* Always safe in the mode setting case. */
/* FIXME: do pre/post-mode set stuff in core KMS code */
dev->vblank_disable_allowed = 1;

ret = intel_fbdev_init(dev);
if (ret)
- goto cleanup_irq;
+ goto cleanup_gem;

drm_kms_helper_poll_init(dev);

@@ -1272,16 +1285,16 @@ static int i915_load_modeset_init(struct drm_device *dev)

return 0;

+cleanup_gem:
+ mutex_lock(&dev->struct_mutex);
+ i915_gem_cleanup_ringbuffer(dev);
+ mutex_unlock(&dev->struct_mutex);
cleanup_irq:
drm_irq_uninstall(dev);
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 359ddce..60ebd79 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1268,6 +1268,7 @@ 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 432fc04..5c7385b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6497,6 +6497,9 @@ 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)
@@ -7432,13 +7435,12 @@ 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);
@@ -7447,12 +7449,15 @@ 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);
}
--
1.7.4.1


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