Using aliasing ppgtt in some cases like playing video the GPU might hang
because HW context was not in a reliable state.
When we resume we switch to default context and when we resume we can
force a restore if default is really there and object is bound.
Cc: Ben Widawsky <b...@bwidawsk.net>
Cc: U. Artie Eoff <ullysses.a.e...@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
drivers/gpu/drm/i915/i915_gem_context.c | 180 +++++++++++++++++---------------
1 file changed, 94 insertions(+), 86 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c
b/drivers/gpu/drm/i915/i915_gem_context.c
index e4c57a3..0a8a07a 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -97,6 +97,91 @@
#define GEN6_CONTEXT_ALIGN (64<<10)
#define GEN7_CONTEXT_ALIGN 4096
+static inline int
+mi_set_context(struct intel_engine_cs *ring,
+ struct intel_context *new_context,
+ u32 hw_flags)
+{
+ u32 flags = hw_flags | MI_MM_SPACE_GTT;
+ const int num_rings =
+ /* Use an extended w/a on ivb+ if signalling from other rings */
+ i915_semaphore_is_enabled(ring->dev) ?
+ hweight32(INTEL_INFO(ring->dev)->ring_mask) - 1 :
+ 0;
+ int len, i, ret;
+
+ /* w/a: If Flush TLB Invalidation Mode is enabled, driver must do a TLB
+ * invalidation prior to MI_SET_CONTEXT. On GEN6 we don't set the value
+ * explicitly, so we rely on the value at ring init, stored in
+ * itlb_before_ctx_switch.
+ */
+ if (IS_GEN6(ring->dev)) {
+ ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, 0);
+ if (ret)
+ return ret;
+ }
+
+ /* These flags are for resource streamer on HSW+ */
+ if (!IS_HASWELL(ring->dev) && INTEL_INFO(ring->dev)->gen < 8)
+ flags |= (MI_SAVE_EXT_STATE_EN | MI_RESTORE_EXT_STATE_EN);
+
+
+ len = 4;
+ if (INTEL_INFO(ring->dev)->gen >= 7)
+ len += 2 + (num_rings ? 4*num_rings + 2 : 0);
+
+ ret = intel_ring_begin(ring, len);
+ if (ret)
+ return ret;
+
+ /* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw,bdw,chv */
+ if (INTEL_INFO(ring->dev)->gen >= 7) {
+ intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_DISABLE);
+ if (num_rings) {
+ struct intel_engine_cs *signaller;
+
+ intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(num_rings));
+ for_each_ring(signaller, to_i915(ring->dev), i) {
+ if (signaller == ring)
+ continue;
+
+ intel_ring_emit(ring,
RING_PSMI_CTL(signaller->mmio_base));
+ intel_ring_emit(ring,
_MASKED_BIT_ENABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
+ }
+ }
+ }
+
+ intel_ring_emit(ring, MI_NOOP);
+ intel_ring_emit(ring, MI_SET_CONTEXT);
+ intel_ring_emit(ring,
i915_gem_obj_ggtt_offset(new_context->legacy_hw_ctx.rcs_state) |
+ flags);
+ /*
+ * w/a: MI_SET_CONTEXT must always be followed by MI_NOOP
+ * WaMiSetContext_Hang:snb,ivb,vlv
+ */
+ intel_ring_emit(ring, MI_NOOP);
+
+ if (INTEL_INFO(ring->dev)->gen >= 7) {
+ if (num_rings) {
+ struct intel_engine_cs *signaller;
+
+ intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(num_rings));
+ for_each_ring(signaller, to_i915(ring->dev), i) {
+ if (signaller == ring)
+ continue;
+
+ intel_ring_emit(ring,
RING_PSMI_CTL(signaller->mmio_base));
+ intel_ring_emit(ring,
_MASKED_BIT_DISABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
+ }
+ }
+ intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_ENABLE);
+ }
+
+ intel_ring_advance(ring);
+
+ return ret;
+}
+
static size_t get_context_alignment(struct drm_device *dev)
{
if (IS_GEN6(dev))
@@ -412,6 +497,7 @@ void i915_gem_context_fini(struct drm_device *dev)
int i915_gem_context_enable(struct drm_i915_private *dev_priv)
{
struct intel_engine_cs *ring;
+ struct intel_context *lctx = dev_priv->ring[RCS].last_context;
int ret, i;
BUG_ON(!dev_priv->ring[RCS].default_context);
@@ -429,12 +515,19 @@ int i915_gem_context_enable(struct drm_i915_private
*dev_priv)
}
}
- } else
+ } else {
for_each_ring(ring, dev_priv, i) {
ret = i915_switch_context(ring, ring->default_context);
if (ret)
return ret;
}
+ /* Force default HW Context restore on Resume */
+ if (lctx == dev_priv->ring[RCS].default_context &&
+ i915_gem_obj_ggtt_bound(lctx->legacy_hw_ctx.rcs_state)) {
+ mi_set_context(&dev_priv->ring[RCS], lctx,
+ MI_FORCE_RESTORE | MI_SAVE_EXT_STATE_EN);
+ }
+ }
return 0;
}
@@ -486,91 +579,6 @@ i915_gem_context_get(struct drm_i915_file_private
*file_priv, u32 id)
return ctx;
}
-static inline int
-mi_set_context(struct intel_engine_cs *ring,
- struct intel_context *new_context,
- u32 hw_flags)
-{
- u32 flags = hw_flags | MI_MM_SPACE_GTT;
- const int num_rings =
- /* Use an extended w/a on ivb+ if signalling from other rings */
- i915_semaphore_is_enabled(ring->dev) ?
- hweight32(INTEL_INFO(ring->dev)->ring_mask) - 1 :
- 0;
- int len, i, ret;
-
- /* w/a: If Flush TLB Invalidation Mode is enabled, driver must do a TLB
- * invalidation prior to MI_SET_CONTEXT. On GEN6 we don't set the value
- * explicitly, so we rely on the value at ring init, stored in
- * itlb_before_ctx_switch.
- */
- if (IS_GEN6(ring->dev)) {
- ret = ring->flush(ring, I915_GEM_GPU_DOMAINS, 0);
- if (ret)
- return ret;
- }
-
- /* These flags are for resource streamer on HSW+ */
- if (!IS_HASWELL(ring->dev) && INTEL_INFO(ring->dev)->gen < 8)
- flags |= (MI_SAVE_EXT_STATE_EN | MI_RESTORE_EXT_STATE_EN);
-
-
- len = 4;
- if (INTEL_INFO(ring->dev)->gen >= 7)
- len += 2 + (num_rings ? 4*num_rings + 2 : 0);
-
- ret = intel_ring_begin(ring, len);
- if (ret)
- return ret;
-
- /* WaProgramMiArbOnOffAroundMiSetContext:ivb,vlv,hsw,bdw,chv */
- if (INTEL_INFO(ring->dev)->gen >= 7) {
- intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_DISABLE);
- if (num_rings) {
- struct intel_engine_cs *signaller;
-
- intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(num_rings));
- for_each_ring(signaller, to_i915(ring->dev), i) {
- if (signaller == ring)
- continue;
-
- intel_ring_emit(ring,
RING_PSMI_CTL(signaller->mmio_base));
- intel_ring_emit(ring,
_MASKED_BIT_ENABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
- }
- }
- }
-
- intel_ring_emit(ring, MI_NOOP);
- intel_ring_emit(ring, MI_SET_CONTEXT);
- intel_ring_emit(ring,
i915_gem_obj_ggtt_offset(new_context->legacy_hw_ctx.rcs_state) |
- flags);
- /*
- * w/a: MI_SET_CONTEXT must always be followed by MI_NOOP
- * WaMiSetContext_Hang:snb,ivb,vlv
- */
- intel_ring_emit(ring, MI_NOOP);
-
- if (INTEL_INFO(ring->dev)->gen >= 7) {
- if (num_rings) {
- struct intel_engine_cs *signaller;
-
- intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(num_rings));
- for_each_ring(signaller, to_i915(ring->dev), i) {
- if (signaller == ring)
- continue;
-
- intel_ring_emit(ring,
RING_PSMI_CTL(signaller->mmio_base));
- intel_ring_emit(ring,
_MASKED_BIT_DISABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
- }
- }
- intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_ENABLE);
- }
-
- intel_ring_advance(ring);
-
- return ret;
-}
-
static inline bool should_skip_switch(struct intel_engine_cs *ring,
struct intel_context *from,
struct intel_context *to)
--
2.1.0
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