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drm/i915/hsw: Fix GPU hang during resume from S3-devices state 

Currently resuming on HSW from S3 pm_test/devices state leads to an
unrecoverable GPU hang. Resetting the GPU during suspend fixes this. For
a full S3 cycle this change only means the reset happens earlier (before
reaching S3). For S4 the reset will happen now both during the freeze
and quiesce phases, which is a benefit since it will guarantee that the
GPU is idle before creating and loading the hibernation image.

Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1476283597-580-1-git-send-email-imre.deak@intel.com
hifive-unleashed-5.1
Imre Deak 2016-10-12 17:46:37 +03:00
parent 45353ce59b
commit 1c777c5d1d
2 changed files with 26 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/gpu/drm/i915/i915_drv.c
View File

@ -532,32 +532,6 @@ static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
static void i915_gem_fini(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = to_i915(dev);
/*
* Neither the BIOS, ourselves or any other kernel
* expects the system to be in execlists mode on startup,
* so we need to reset the GPU back to legacy mode. And the only
* known way to disable logical contexts is through a GPU reset.
*
* So in order to leave the system in a known default configuration,
* always reset the GPU upon unload. Afterwards we then clean up the
* GEM state tracking, flushing off the requests and leaving the
* system in a known idle state.
*
* Note that is of the upmost importance that the GPU is idle and
* all stray writes are flushed *before* we dismantle the backing
* storage for the pinned objects.
*
* However, since we are uncertain that reseting the GPU on older
* machines is a good idea, we don't - just in case it leaves the
* machine in an unusable condition.
*/
if (HAS_HW_CONTEXTS(dev)) {
int reset = intel_gpu_reset(dev_priv, ALL_ENGINES);
WARN_ON(reset && reset != -ENODEV);
}
mutex_lock(&dev->struct_mutex);
i915_gem_cleanup_engines(dev);
i915_gem_context_fini(dev);
@ -636,6 +610,8 @@ static int i915_load_modeset_init(struct drm_device *dev)
return 0;
cleanup_gem:
if (i915_gem_suspend(dev))
DRM_ERROR("failed to idle hardware; continuing to unload!\n");
i915_gem_fini(dev);
cleanup_irq:
intel_guc_fini(dev);

24
drivers/gpu/drm/i915/i915_gem.c
View File

@ -4273,6 +4273,30 @@ int i915_gem_suspend(struct drm_device *dev)
*/
WARN_ON(dev_priv->gt.awake);
/*
* Neither the BIOS, ourselves or any other kernel
* expects the system to be in execlists mode on startup,
* so we need to reset the GPU back to legacy mode. And the only
* known way to disable logical contexts is through a GPU reset.
*
* So in order to leave the system in a known default configuration,
* always reset the GPU upon unload and suspend. Afterwards we then
* clean up the GEM state tracking, flushing off the requests and
* leaving the system in a known idle state.
*
* Note that is of the upmost importance that the GPU is idle and
* all stray writes are flushed *before* we dismantle the backing
* storage for the pinned objects.
*
* However, since we are uncertain that resetting the GPU on older
* machines is a good idea, we don't - just in case it leaves the
* machine in an unusable condition.
*/
if (HAS_HW_CONTEXTS(dev)) {
int reset = intel_gpu_reset(dev_priv, ALL_ENGINES);
WARN_ON(reset && reset != -ENODEV);
}
return 0;
err: