[Intel-gfx] [PATCH v4 2/3] drm/i915: abolish separate per-ring default_context pointers
Dave Gordon
david.s.gordon at intel.com
Tue Jan 19 11:02:54 PST 2016
Now that we've eliminated a lot of uses of ring->default_context,
we can eliminate the pointer itself.
All the engines share the same default intel_context, so we can just
keep a single reference to it in the dev_priv structure rather than one
in each of the engine[] elements. This make refcounting more sensible
too, as we now have a refcount of one for the one pointer, rather than
a refcount of one but multiple pointers.
>From an idea by Chris Wilson.
v2: transform an extra instance of ring->default_context introduced by
42f1cae8c drm/i915: Restore inhibiting the load of the default context
That patch's commentary includes:
v2: Mark the global default context as uninitialized on GPU reset so
that the context-local workarounds are reloaded upon re-enabling
The code implementing that now also benefits from the replacement of
the multiple (per-ring) pointers to the default context with a single
pointer to the unique kernel context.
v4: Rebased, remove underused local (Nick Hoath)
Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
Reviewed-by: Nick Hoath <nicholas.hoath at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 4 ++--
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/i915_gem.c | 6 +++---
drivers/gpu/drm/i915/i915_gem_context.c | 29 +++++++++++------------------
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +-
drivers/gpu/drm/i915/i915_guc_submission.c | 6 +++---
drivers/gpu/drm/i915/intel_lrc.c | 17 +++++++++--------
drivers/gpu/drm/i915/intel_ringbuffer.h | 1 -
8 files changed, 31 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 0b3550f..37c2c50 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1961,7 +1961,7 @@ static int i915_context_status(struct seq_file *m, void *unused)
seq_puts(m, "HW context ");
describe_ctx(m, ctx);
for_each_ring(ring, dev_priv, i) {
- if (ring->default_context == ctx)
+ if (dev_priv->kernel_context == ctx)
seq_printf(m, "(default context %s) ",
ring->name);
}
@@ -2058,7 +2058,7 @@ static int i915_dump_lrc(struct seq_file *m, void *unused)
list_for_each_entry(ctx, &dev_priv->context_list, link) {
for_each_ring(ring, dev_priv, i) {
- if (ring->default_context != ctx)
+ if (dev_priv->kernel_context != ctx)
i915_dump_lrc_obj(m, ctx, ring);
}
}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index dfebf9f..59dc701 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1959,6 +1959,8 @@ struct drm_i915_private {
void (*stop_ring)(struct intel_engine_cs *ring);
} gt;
+ struct intel_context *kernel_context;
+
bool edp_low_vswing;
/* perform PHY state sanity checks? */
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8e716b6..06abe1b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2680,7 +2680,7 @@ void i915_gem_request_free(struct kref *req_ref)
if (ctx) {
if (i915.enable_execlists) {
- if (ctx != req->ring->default_context)
+ if (ctx != req->i915->kernel_context)
intel_lr_context_unpin(req);
}
@@ -2776,7 +2776,7 @@ struct drm_i915_gem_request *
int err;
if (ctx == NULL)
- ctx = engine->default_context;
+ ctx = to_i915(engine->dev)->kernel_context;
err = __i915_gem_request_alloc(engine, ctx, &req);
return err ? ERR_PTR(err) : req;
}
@@ -4864,7 +4864,7 @@ int i915_gem_init_rings(struct drm_device *dev)
*/
init_unused_rings(dev);
- BUG_ON(!dev_priv->ring[RCS].default_context);
+ BUG_ON(!dev_priv->kernel_context);
ret = i915_ppgtt_init_hw(dev);
if (ret) {
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index c25083c..6a4f64b 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -347,22 +347,20 @@ void i915_gem_context_reset(struct drm_device *dev)
i915_gem_context_unreference(lctx);
ring->last_context = NULL;
}
-
- /* Force the GPU state to be reinitialised on enabling */
- if (ring->default_context)
- ring->default_context->legacy_hw_ctx.initialized = false;
}
+
+ /* Force the GPU state to be reinitialised on enabling */
+ dev_priv->kernel_context->legacy_hw_ctx.initialized = false;
}
int i915_gem_context_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_context *ctx;
- int i;
/* Init should only be called once per module load. Eventually the
* restriction on the context_disabled check can be loosened. */
- if (WARN_ON(dev_priv->ring[RCS].default_context))
+ if (WARN_ON(dev_priv->kernel_context))
return 0;
if (intel_vgpu_active(dev) && HAS_LOGICAL_RING_CONTEXTS(dev)) {
@@ -392,12 +390,7 @@ int i915_gem_context_init(struct drm_device *dev)
return PTR_ERR(ctx);
}
- for (i = 0; i < I915_NUM_RINGS; i++) {
- struct intel_engine_cs *ring = &dev_priv->ring[i];
-
- /* NB: RCS will hold a ref for all rings */
- ring->default_context = ctx;
- }
+ dev_priv->kernel_context = ctx;
DRM_DEBUG_DRIVER("%s context support initialized\n",
i915.enable_execlists ? "LR" :
@@ -408,7 +401,7 @@ int i915_gem_context_init(struct drm_device *dev)
void i915_gem_context_fini(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- struct intel_context *dctx = dev_priv->ring[RCS].default_context;
+ struct intel_context *dctx = dev_priv->kernel_context;
int i;
if (dctx->legacy_hw_ctx.rcs_state) {
@@ -435,17 +428,17 @@ void i915_gem_context_fini(struct drm_device *dev)
i915_gem_object_ggtt_unpin(dctx->legacy_hw_ctx.rcs_state);
}
- for (i = 0; i < I915_NUM_RINGS; i++) {
+ for (i = I915_NUM_RINGS; --i >= 0;) {
struct intel_engine_cs *ring = &dev_priv->ring[i];
- if (ring->last_context)
+ if (ring->last_context) {
i915_gem_context_unreference(ring->last_context);
-
- ring->default_context = NULL;
- ring->last_context = NULL;
+ ring->last_context = NULL;
+ }
}
i915_gem_context_unreference(dctx);
+ dev_priv->kernel_context = NULL;
}
int i915_gem_context_enable(struct drm_i915_gem_request *req)
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 06ca408..7eeb244 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1050,7 +1050,7 @@ static void i915_gem_record_rings(struct drm_device *dev,
if (request)
rbuf = request->ctx->engine[ring->id].ringbuf;
else
- rbuf = ring->default_context->engine[ring->id].ringbuf;
+ rbuf = dev_priv->kernel_context->engine[ring->id].ringbuf;
} else
rbuf = ring->buffer;
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 9c24424..51ae5c1 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -964,7 +964,7 @@ int i915_guc_submission_enable(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_guc *guc = &dev_priv->guc;
- struct intel_context *ctx = dev_priv->ring[RCS].default_context;
+ struct intel_context *ctx = dev_priv->kernel_context;
struct i915_guc_client *client;
/* client for execbuf submission */
@@ -1021,7 +1021,7 @@ int intel_guc_suspend(struct drm_device *dev)
if (!i915.enable_guc_submission)
return 0;
- ctx = dev_priv->ring[RCS].default_context;
+ ctx = dev_priv->kernel_context;
data[0] = HOST2GUC_ACTION_ENTER_S_STATE;
/* any value greater than GUC_POWER_D0 */
@@ -1047,7 +1047,7 @@ int intel_guc_resume(struct drm_device *dev)
if (!i915.enable_guc_submission)
return 0;
- ctx = dev_priv->ring[RCS].default_context;
+ ctx = dev_priv->kernel_context;
data[0] = HOST2GUC_ACTION_EXIT_S_STATE;
data[1] = GUC_POWER_D0;
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ec2482da..2c6da40 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -598,7 +598,7 @@ static int execlists_context_queue(struct drm_i915_gem_request *request)
struct drm_i915_gem_request *cursor;
int num_elements = 0;
- if (request->ctx != ring->default_context)
+ if (request->ctx != request->i915->kernel_context)
intel_lr_context_pin(request);
i915_gem_request_reference(request);
@@ -690,7 +690,7 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
request->ringbuf = request->ctx->engine[request->ring->id].ringbuf;
- if (request->ctx != request->ring->default_context) {
+ if (request->ctx != request->i915->kernel_context) {
ret = intel_lr_context_pin(request);
if (ret)
return ret;
@@ -1006,7 +1006,7 @@ void intel_execlists_retire_requests(struct intel_engine_cs *ring)
struct drm_i915_gem_object *ctx_obj =
ctx->engine[ring->id].state;
- if (ctx_obj && (ctx != ring->default_context))
+ if (ctx_obj && (ctx != req->i915->kernel_context))
intel_lr_context_unpin(req);
list_del(&req->execlist_link);
i915_gem_request_unreference(req);
@@ -1529,7 +1529,7 @@ static int gen8_init_common_ring(struct intel_engine_cs *ring)
u8 next_context_status_buffer_hw;
lrc_setup_hardware_status_page(ring,
- ring->default_context->engine[ring->id].state);
+ dev_priv->kernel_context->engine[ring->id].state);
I915_WRITE_IMR(ring, ~(ring->irq_enable_mask | ring->irq_keep_mask));
I915_WRITE(RING_HWSTAM(ring->mmio_base), 0xffffffff);
@@ -2005,6 +2005,7 @@ void intel_logical_ring_cleanup(struct intel_engine_cs *ring)
static int
logical_ring_init(struct drm_device *dev, struct intel_engine_cs *ring)
{
+ struct intel_context *dctx = to_i915(dev)->kernel_context;
int ret;
/* Intentionally left blank. */
@@ -2027,12 +2028,12 @@ void intel_logical_ring_cleanup(struct intel_engine_cs *ring)
if (ret)
goto error;
- ret = intel_lr_context_deferred_alloc(ring->default_context, ring);
+ ret = intel_lr_context_deferred_alloc(dctx, ring);
if (ret)
goto error;
/* As this is the default context, always pin it */
- ret = intel_lr_context_do_pin(ring, ring->default_context);
+ ret = intel_lr_context_do_pin(ring, dctx);
if (ret) {
DRM_ERROR(
"Failed to pin and map ringbuffer %s: %d\n",
@@ -2398,7 +2399,7 @@ void intel_lr_context_free(struct intel_context *ctx)
ctx->engine[i].ringbuf;
struct intel_engine_cs *ring = ringbuf->ring;
- if (ctx == ring->default_context) {
+ if (ctx == ctx->i915->kernel_context) {
intel_unpin_ringbuffer_obj(ringbuf);
i915_gem_object_ggtt_unpin(ctx_obj);
}
@@ -2517,7 +2518,7 @@ int intel_lr_context_deferred_alloc(struct intel_context *ctx,
ctx->engine[ring->id].ringbuf = ringbuf;
ctx->engine[ring->id].state = ctx_obj;
- if (ctx != ring->default_context && ring->init_context) {
+ if (ctx != ctx->i915->kernel_context && ring->init_context) {
struct drm_i915_gem_request *req;
req = i915_gem_request_alloc(ring, ctx);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index ede5795..ce10228 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -309,7 +309,6 @@ struct intel_engine_cs {
wait_queue_head_t irq_queue;
- struct intel_context *default_context;
struct intel_context *last_context;
struct intel_ring_hangcheck hangcheck;
--
1.9.1
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