[PATCH 05/21] drm/i915: Always try to reset the GPU on takeover
Chris Wilson
chris at chris-wilson.co.uk
Tue Oct 30 09:20:46 UTC 2018
When we first introduced the reset to sanitize the GPU on taking over
from the BIOS and before returning control to third parties (the BIOS!),
we restricted it to only systems utilizing HW contexts as we were
uncertain of how stable our reset mechanism truly was. We now have
reasonable coverage across all machines that expose a GPU reset method,
and so we should be safe to sanitize the GPU state everywhere.
v2: We _have_ to skip the reset if it would clobber the display.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.c | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 11 ++---------
drivers/gpu/drm/i915/i915_pci.c | 5 +++++
drivers/gpu/drm/i915/intel_device_info.h | 1 +
drivers/gpu/drm/i915/intel_display.c | 4 ++--
drivers/gpu/drm/i915/intel_engine_cs.c | 14 +++++++++++++-
drivers/gpu/drm/i915/intel_ringbuffer.h | 2 +-
drivers/gpu/drm/i915/selftests/i915_gem.c | 2 +-
8 files changed, 26 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index f6416b1d3452..ccce4c267256 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2163,7 +2163,7 @@ static int i915_drm_resume_early(struct drm_device *dev)
intel_power_domains_resume(dev_priv);
- intel_engines_sanitize(dev_priv);
+ intel_engines_sanitize(dev_priv, true);
enable_rpm_wakeref_asserts(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 9a8af9454a53..8ea253dcfcf2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3437,8 +3437,7 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915)
i915_retire_requests(i915);
GEM_BUG_ON(i915->gt.active_requests);
- if (!intel_gpu_reset(i915, ALL_ENGINES))
- intel_engines_sanitize(i915);
+ intel_engines_sanitize(i915, false);
/*
* Undo nop_submit_request. We prevent all new i915 requests from
@@ -5030,8 +5029,6 @@ void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj)
void i915_gem_sanitize(struct drm_i915_private *i915)
{
- int err;
-
GEM_TRACE("\n");
mutex_lock(&i915->drm.struct_mutex);
@@ -5056,11 +5053,7 @@ void i915_gem_sanitize(struct drm_i915_private *i915)
* it may impact the display and we are uncertain about the stability
* of the reset, so this could be applied to even earlier gen.
*/
- err = -ENODEV;
- if (INTEL_GEN(i915) >= 5 && intel_has_gpu_reset(i915))
- err = WARN_ON(intel_gpu_reset(i915, ALL_ENGINES));
- if (!err)
- intel_engines_sanitize(i915);
+ intel_engines_sanitize(i915, false);
intel_uncore_forcewake_put(i915, FORCEWAKE_ALL);
intel_runtime_pm_put(i915);
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 44e745921ac1..e43449efbb31 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -69,6 +69,7 @@
GEN(2), \
.num_pipes = 1, \
.has_overlay = 1, .overlay_needs_physical = 1, \
+ .gpu_reset_clobbers_display = true, \
.has_gmch_display = 1, \
.hws_needs_physical = 1, \
.unfenced_needs_alignment = 1, \
@@ -109,6 +110,7 @@ static const struct intel_device_info intel_i865g_info = {
GEN(3), \
.num_pipes = 2, \
.has_gmch_display = 1, \
+ .gpu_reset_clobbers_display = true, \
.ring_mask = RENDER_RING, \
.has_snoop = true, \
.has_coherent_ggtt = true, \
@@ -179,6 +181,7 @@ static const struct intel_device_info intel_pineview_info = {
.num_pipes = 2, \
.has_hotplug = 1, \
.has_gmch_display = 1, \
+ .gpu_reset_clobbers_display = true, \
.ring_mask = RENDER_RING, \
.has_snoop = true, \
.has_coherent_ggtt = true, \
@@ -208,6 +211,7 @@ static const struct intel_device_info intel_g45_info = {
GEN4_FEATURES,
PLATFORM(INTEL_G45),
.ring_mask = RENDER_RING | BSD_RING,
+ .gpu_reset_clobbers_display = false,
};
static const struct intel_device_info intel_gm45_info = {
@@ -216,6 +220,7 @@ static const struct intel_device_info intel_gm45_info = {
.is_mobile = 1, .has_fbc = 1,
.supports_tv = 1,
.ring_mask = RENDER_RING | BSD_RING,
+ .gpu_reset_clobbers_display = false,
};
#define GEN5_FEATURES \
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index b4c2c4eae78b..d49c7e8613d9 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -92,6 +92,7 @@ enum intel_ppgtt {
func(has_csr); \
func(has_ddi); \
func(has_dp_mst); \
+ func(gpu_reset_clobbers_display); \
func(has_reset_engine); \
func(has_fbc); \
func(has_fpga_dbg); \
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c3cadc09f859..27da26794930 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3733,8 +3733,8 @@ __intel_display_resume(struct drm_device *dev,
static bool gpu_reset_clobbers_display(struct drm_i915_private *dev_priv)
{
- return intel_has_gpu_reset(dev_priv) &&
- INTEL_GEN(dev_priv) < 5 && !IS_G4X(dev_priv);
+ return (INTEL_INFO(dev_priv)->gpu_reset_clobbers_display &&
+ intel_has_gpu_reset(dev_priv));
}
void intel_prepare_reset(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index bc147d9e6c92..86d7364c6e5d 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1068,22 +1068,34 @@ void intel_engines_reset_default_submission(struct drm_i915_private *i915)
engine->set_default_submission(engine);
}
+static bool reset_engines(struct drm_i915_private *i915)
+{
+ if (INTEL_INFO(i915)->gpu_reset_clobbers_display)
+ return false;
+
+ return intel_gpu_reset(i915, ALL_ENGINES) == 0;
+}
+
/**
* intel_engines_sanitize: called after the GPU has lost power
* @i915: the i915 device
+ * @force: ignore a failed reset and sanitize engine state anyway
*
* Anytime we reset the GPU, either with an explicit GPU reset or through a
* PCI power cycle, the GPU loses state and we must reset our state tracking
* to match. Note that calling intel_engines_sanitize() if the GPU has not
* been reset results in much confusion!
*/
-void intel_engines_sanitize(struct drm_i915_private *i915)
+void intel_engines_sanitize(struct drm_i915_private *i915, bool force)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
GEM_TRACE("\n");
+ if (!reset_engines(i915) && !force)
+ return;
+
for_each_engine(engine, i915, id) {
if (engine->reset.reset)
engine->reset.reset(engine, NULL);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index d3a08d0f02fe..e17b3c226e8d 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -1109,7 +1109,7 @@ gen8_emit_ggtt_write(u32 *cs, u32 value, u32 gtt_offset)
return cs;
}
-void intel_engines_sanitize(struct drm_i915_private *i915);
+void intel_engines_sanitize(struct drm_i915_private *i915, bool force);
bool intel_engine_is_idle(struct intel_engine_cs *engine);
bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem.c b/drivers/gpu/drm/i915/selftests/i915_gem.c
index d0aa19d17653..bdcc53e15e75 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem.c
@@ -121,7 +121,7 @@ static void pm_resume(struct drm_i915_private *i915)
*/
intel_runtime_pm_get(i915);
- intel_engines_sanitize(i915);
+ intel_engines_sanitize(i915, false);
i915_gem_sanitize(i915);
i915_gem_resume(i915);
--
2.19.1
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