On 9/5/2017 8:24 PM, Michał Winiarski wrote:
On Fri, Sep 01, 2017 at 11:02:11AM +0530, Sagar Arun Kamble wrote:
Teardown of GuC HW/SW state was not properly done in unload path.
During unload, we can rely on intel_guc_reset_prepare being done
as part of i915_gem_suspend for disabling GuC interfaces.
We will have to disable GuC submission prior to suspend as that involves
communication with GuC to destroy doorbell. So intel_uc_fini_hw has to
be called as part of i915_gem_suspend during unload as that really
takes care of finishing the GuC operations. Created new parameter for
i915_gem_suspend to handle unload/suspend path w.r.t gem and GuC suspend.
GuC related allocations are cleaned up as part of intel_uc_cleanup_hw.
Is this still accurate description? After changes from v2?
No. Sorry. Will update this in the new version.
v2: Prepared i915_gem_unload. (Michal)
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 6 +--
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gem.c | 79 ++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_guc.c | 13 ++++++
drivers/gpu/drm/i915/intel_guc.h | 1 +
drivers/gpu/drm/i915/intel_uc.c | 14 +++---
drivers/gpu/drm/i915/intel_uc_common.h | 1 +
7 files changed, 103 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index b2e8f95..b6cc2fe 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -601,7 +601,7 @@ static void i915_gem_fini(struct drm_i915_private *dev_priv)
i915_gem_drain_workqueue(dev_priv);
mutex_lock(&dev_priv->drm.struct_mutex);
- intel_uc_fini_hw(dev_priv);
+ intel_uc_cleanup_hw(dev_priv);
i915_gem_cleanup_engines(dev_priv);
i915_gem_contexts_fini(dev_priv);
i915_gem_cleanup_userptr(dev_priv);
@@ -682,7 +682,7 @@ static int i915_load_modeset_init(struct drm_device *dev)
return 0;
cleanup_gem:
- if (i915_gem_suspend(dev_priv))
+ if (i915_gem_unload(dev_priv))
DRM_ERROR("failed to idle hardware; continuing to unload!\n");
i915_gem_fini(dev_priv);
cleanup_uc:
@@ -1375,7 +1375,7 @@ void i915_driver_unload(struct drm_device *dev)
i915_driver_unregister(dev_priv);
- if (i915_gem_suspend(dev_priv))
+ if (i915_gem_unload(dev_priv))
DRM_ERROR("failed to idle hardware; continuing to unload!\n");
intel_display_power_get(dev_priv, POWER_DOMAIN_INIT);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 064bf0f..570e71e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3628,6 +3628,7 @@ void i915_gem_reset_engine(struct intel_engine_cs *engine,
int i915_gem_wait_for_idle(struct drm_i915_private *dev_priv,
unsigned int flags);
int __must_check i915_gem_suspend(struct drm_i915_private *dev_priv);
+int __must_check i915_gem_unload(struct drm_i915_private *dev_priv);
void i915_gem_resume(struct drm_i915_private *dev_priv);
int i915_gem_fault(struct vm_fault *vmf);
int i915_gem_object_wait(struct drm_i915_gem_object *obj,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 977500f..24cefe9 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4624,6 +4624,85 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
return ret;
}
+int i915_gem_unload(struct drm_i915_private *dev_priv)
+{
+ struct drm_device *dev = &dev_priv->drm;
+ int ret;
+
+ intel_runtime_pm_get(dev_priv);
+ intel_suspend_gt_powersave(dev_priv);
+
+ mutex_lock(&dev->struct_mutex);
+
+ /* We have to flush all the executing contexts to main memory so
+ * that they can saved in the hibernation image. To ensure the last
+ * context image is coherent, we have to switch away from it. That
+ * leaves the dev_priv->kernel_context still active when
+ * we actually suspend, and its image in memory may not match the GPU
+ * state. Fortunately, the kernel_context is disposable and we do
+ * not rely on its state.
+ */
+ ret = i915_gem_switch_to_kernel_context(dev_priv);
+ if (ret)
+ goto err_unlock;
+
+ ret = i915_gem_wait_for_idle(dev_priv,
+ I915_WAIT_INTERRUPTIBLE |
+ I915_WAIT_LOCKED);
+ if (ret)
+ goto err_unlock;
+
+ assert_kernel_context_is_current(dev_priv);
+ i915_gem_contexts_lost(dev_priv);
+ mutex_unlock(&dev->struct_mutex);
+
+ cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
+ cancel_delayed_work_sync(&dev_priv->gt.retire_work);
+
+ /* As the idle_work is rearming if it detects a race, play safe and
+ * repeat the flush until it is definitely idle.
+ */
+ while (flush_delayed_work(&dev_priv->gt.idle_work))
+ ;
+
+ /* Assert that we successfully flushed all the work and
+ * reset the GPU back to its idle, low power state.
+ */
+ WARN_ON(dev_priv->gt.awake);
+ WARN_ON(!intel_engines_are_idle(dev_priv));
+
+ /* Handle GuC suspension in case of unloading/system suspend */
+ intel_uc_fini_hw(dev_priv);
+
+ /*
+ * 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.
+ */
+ i915_gem_sanitize(dev_priv);
+ goto out_rpm_put;
+
+err_unlock:
+ mutex_unlock(&dev->struct_mutex);
+out_rpm_put:
+ intel_runtime_pm_put(dev_priv);
+ return ret;
+}
+
^^^ This is just copypasta of i915_gem_suspend
One line has changed... (well, I think it's no longer up-to-date with drm-tip,
so there's more, but s/intel_guc_system_suspend/intel_uc_fini_hw was the
intention, right?)
We can do better.
Yes. This is just a line change. Earlier, I parameterised
i915_gem_suspend to differentiate suspend vs unload.
Michal suggested if we could separate these paths for gem. I am okay any
of these paths. Let me know your thoughts.
void i915_gem_resume(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = &dev_priv->drm;
diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index 1fd8599..da81c37 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -343,3 +343,16 @@ int intel_guc_system_resume(struct intel_guc *guc)
*/
return ret;
}
+
+void intel_guc_fini(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+ struct drm_device *dev = &dev_priv->drm;
+
+ if (i915.enable_guc_submission) {
+ mutex_lock(&dev->struct_mutex);
+ i915_guc_submission_disable(dev_priv);
+ mutex_unlock(&dev->struct_mutex);
+ intel_guc_reset_prepare(guc);
+ }
+}
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index bf4dda0..1b3305f 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -169,6 +169,7 @@ static inline u32 guc_ggtt_offset(struct i915_vma *vma)
int intel_guc_runtime_resume(struct intel_guc *guc);
int intel_guc_system_suspend(struct intel_guc *guc);
int intel_guc_system_resume(struct intel_guc *guc);
+void intel_guc_fini(struct intel_guc *guc);
static inline int intel_guc_send(struct intel_guc *guc, const u32 *action,
u32 len)
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 30c004c..9216c73 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -381,20 +381,16 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
{
+ intel_guc_fini(&dev_priv->guc);
+}
+
+void intel_uc_cleanup_hw(struct drm_i915_private *dev_priv)
+{
guc_free_load_err_log(&dev_priv->guc);
Not really part of the patch... But still - why are we touching this here?
Isn't guc->log->vma is created only if GuC is loaded?
This is to differentiate the fini and cleanup. guc->log->vma is create
only if GuC is loaded.
I will move this past guc_loading check below.
if (!i915.enable_guc_loading)
return;
if (i915.enable_guc_submission)
- i915_guc_submission_disable(dev_priv);
-
- intel_guc_disable_communication(&dev_priv->guc);
-
- if (i915.enable_guc_submission) {
- gen9_disable_guc_interrupts(dev_priv);
i915_guc_submission_fini(dev_priv);
- }
-
- i915_ggtt_disable_guc(dev_priv);
}
We now have intel_uc_fini_hw and intel_uc_cleanup_hw.
intel_uc_fini_hw is called by i915_gem_unload, intel_uc_cleanup_hw is called by
i915_gem_fini - so, it's in that order, we're first calling fini, then calling
cleanup.
Both are only used on unload path, while intel_uc_init_hw, is called on load,
resume, and reset (by i915_gem_init_hw)
We should probably redo the naming at this point... Perhaps stick with the
unload for rather than fini_hw? Or at least comment on the ordering.
Sure. I will make this unload then.
-Michał
diff --git a/drivers/gpu/drm/i915/intel_uc_common.h b/drivers/gpu/drm/i915/intel_uc_common.h
index f454f73..c6e873d 100644
--- a/drivers/gpu/drm/i915/intel_uc_common.h
+++ b/drivers/gpu/drm/i915/intel_uc_common.h
@@ -97,5 +97,6 @@ struct intel_uc_fw {
void intel_uc_fini_fw(struct drm_i915_private *dev_priv);
int intel_uc_init_hw(struct drm_i915_private *dev_priv);
void intel_uc_fini_hw(struct drm_i915_private *dev_priv);
+void intel_uc_cleanup_hw(struct drm_i915_private *dev_priv);
#endif
--
1.9.1
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