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drm/i915: Mark the current context as lost on suspend 

In order to force a reload of the context image upon resume, we first
need to mark its absence on suspend. Currently we are failing to restore
the golden context state and any context w/a to the default context
after resume.

One oversight corrected, is that we had forgotten to reapply the L3
remapping when restoring the lost default context.

v2: Remove deprecated WARN.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-7-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-04-28 09:56:41 +01:00
parent 3d77e9be62
commit b2e862d08e
3 changed files with 25 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -3293,6 +3293,7 @@ void i915_gem_object_save_bit_17_swizzle(struct drm_i915_gem_object *obj);
/* i915_gem_context.c */
int __must_check i915_gem_context_init(struct drm_device *dev);
void i915_gem_context_lost(struct drm_i915_private *dev_priv);
void i915_gem_context_fini(struct drm_device *dev);
void i915_gem_context_reset(struct drm_device *dev);
int i915_gem_context_open(struct drm_device *dev, struct drm_file *file);

1
drivers/gpu/drm/i915/i915_gem.c
View File

@ -4719,6 +4719,7 @@ i915_gem_suspend(struct drm_device *dev)
i915_gem_retire_requests(dev);
i915_gem_stop_engines(dev);
i915_gem_context_lost(dev_priv);
mutex_unlock(&dev->struct_mutex);
cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);

54
drivers/gpu/drm/i915/i915_gem_context.c
View File

@ -90,6 +90,8 @@
#include "i915_drv.h"
#include "i915_trace.h"
#define ALL_L3_SLICES(dev) (1 << NUM_L3_SLICES(dev)) - 1
/* This is a HW constraint. The value below is the largest known requirement
* I've seen in a spec to date, and that was a workaround for a non-shipping
* part. It should be safe to decrease this, but it's more future proof as is.
@ -249,7 +251,7 @@ __create_hw_context(struct drm_device *dev,
/* NB: Mark all slices as needing a remap so that when the context first
* loads it will restore whatever remap state already exists. If there
* is no remap info, it will be a NOP. */
ctx->remap_slice = (1 << NUM_L3_SLICES(dev)) - 1;
ctx->remap_slice = ALL_L3_SLICES(dev_priv);
ctx->hang_stats.ban_period_seconds = DRM_I915_CTX_BAN_PERIOD;
@ -336,7 +338,6 @@ static void i915_gem_context_unpin(struct intel_context *ctx,
void i915_gem_context_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
if (i915.enable_execlists) {
struct intel_context *ctx;
@ -345,17 +346,7 @@ void i915_gem_context_reset(struct drm_device *dev)
intel_lr_context_reset(dev_priv, ctx);
}
for (i = 0; i < I915_NUM_ENGINES; i++) {
struct intel_engine_cs *engine = &dev_priv->engine[i];
if (engine->last_context) {
i915_gem_context_unpin(engine->last_context, engine);
engine->last_context = NULL;
}
}
/* Force the GPU state to be reinitialised on enabling */
dev_priv->kernel_context->legacy_hw_ctx.initialized = false;
i915_gem_context_lost(dev_priv);
}
int i915_gem_context_init(struct drm_device *dev)
@ -403,11 +394,29 @@ int i915_gem_context_init(struct drm_device *dev)
return 0;
}
void i915_gem_context_lost(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *engine;
for_each_engine(engine, dev_priv) {
if (engine->last_context == NULL)
continue;
i915_gem_context_unpin(engine->last_context, engine);
engine->last_context = NULL;
}
/* Force the GPU state to be reinitialised on enabling */
dev_priv->kernel_context->legacy_hw_ctx.initialized = false;
dev_priv->kernel_context->remap_slice = ALL_L3_SLICES(dev_priv);
}
void i915_gem_context_fini(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_context *dctx = dev_priv->kernel_context;
int i;
i915_gem_context_lost(dev_priv);
if (dctx->legacy_hw_ctx.rcs_state) {
/* The only known way to stop the gpu from accessing the hw context is
@ -415,26 +424,9 @@ void i915_gem_context_fini(struct drm_device *dev)
* other code, leading to spurious errors. */
intel_gpu_reset(dev, ALL_ENGINES);
/* When default context is created and switched to, base object refcount
* will be 2 (+1 from object creation and +1 from do_switch()).
* i915_gem_context_fini() will be called after gpu_idle() has switched
* to default context. So we need to unreference the base object once
* to offset the do_switch part, so that i915_gem_context_unreference()
* can then free the base object correctly. */
WARN_ON(!dev_priv->engine[RCS].last_context);
i915_gem_object_ggtt_unpin(dctx->legacy_hw_ctx.rcs_state);
}
for (i = I915_NUM_ENGINES; --i >= 0;) {
struct intel_engine_cs *engine = &dev_priv->engine[i];
if (engine->last_context) {
i915_gem_context_unpin(engine->last_context, engine);
engine->last_context = NULL;
}
}
i915_gem_context_unreference(dctx);
dev_priv->kernel_context = NULL;
}