[PATCH 10/17] drm/i915: Rearrange switch_context to load the aliasing ppgtt on first use
Chris Wilson
chris at chris-wilson.co.uk
Tue Apr 19 19:45:41 UTC 2016
The code to switch_mm() is already handled by i915_switch_context(), the
only difference required to setup the aliasing ppgtt is that we need to
emit te switch_mm() on the first context, i.e. when transitioning from
engine->last_context == NULL. This allows us to defer the
initialisation of the GPU from early device initialisation to first use,
which should marginally speed up both. The caveat is that we then defer
the context initialisation until first use - i.e. we cannot assume that
the GPU engines are initialised. For example, this means that power
contexts for rc6 (Ironlake) need to explicitly loaded, as they are.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 1 -
drivers/gpu/drm/i915/i915_gem.c | 28 ---------------------
drivers/gpu/drm/i915/i915_gem_context.c | 43 +++++++++------------------------
drivers/gpu/drm/i915/i915_gem_gtt.c | 14 -----------
drivers/gpu/drm/i915/i915_gem_gtt.h | 1 -
5 files changed, 12 insertions(+), 75 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7b347c20880d..ed38e2ea76a5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3302,7 +3302,6 @@ 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);
-int i915_gem_context_enable(struct drm_i915_gem_request *req);
void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
int i915_switch_context(struct drm_i915_gem_request *req);
struct intel_context *
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ca46ecb77412..752d9619d900 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4917,34 +4917,6 @@ i915_gem_init_hw(struct drm_device *dev)
if (ret)
goto out;
- /* Now it is safe to go back round and do everything else: */
- for_each_engine(engine, dev_priv) {
- struct drm_i915_gem_request *req;
-
- req = i915_gem_request_alloc(engine, NULL);
- if (IS_ERR(req)) {
- ret = PTR_ERR(req);
- break;
- }
-
- ret = i915_ppgtt_init_ring(req);
- if (ret)
- goto err_request;
-
- ret = i915_gem_context_enable(req);
- if (ret)
- goto err_request;
-
-err_request:
- i915_add_request_no_flush(req);
- if (ret) {
- DRM_ERROR("Failed to enable %s, error=%d\n",
- engine->name, ret);
- i915_gem_cleanup_engines(dev);
- break;
- }
- }
-
out:
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
return ret;
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index e5b3d74f8222..7932fd445628 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -431,27 +431,6 @@ void i915_gem_context_fini(struct drm_device *dev)
dev_priv->kernel_context = NULL;
}
-int i915_gem_context_enable(struct drm_i915_gem_request *req)
-{
- struct intel_engine_cs *engine = req->engine;
- int ret;
-
- if (i915.enable_execlists) {
- if (engine->init_context == NULL)
- return 0;
-
- ret = engine->init_context(req);
- } else
- ret = i915_switch_context(req);
-
- if (ret) {
- DRM_ERROR("ring init context: %d\n", ret);
- return ret;
- }
-
- return 0;
-}
-
static int context_idr_cleanup(int id, void *p, void *data)
{
struct intel_context *ctx = p;
@@ -650,7 +629,7 @@ static bool
needs_pd_load_pre(struct intel_engine_cs *engine, struct intel_context *to)
{
if (!to->ppgtt)
- return false;
+ return engine->last_context == NULL;
if (engine->last_context == to &&
!(intel_engine_flag(engine) & to->ppgtt->pd_dirty_rings))
@@ -684,6 +663,7 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
{
struct intel_context *to = req->ctx;
struct intel_engine_cs *engine = req->engine;
+ struct i915_hw_ppgtt *ppgtt = to->ppgtt ?: req->i915->mm.aliasing_ppgtt;
struct intel_context *from;
u32 hw_flags;
int ret, i;
@@ -725,7 +705,7 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
* Register Immediate commands in Ring Buffer before submitting
* a context."*/
trace_switch_mm(engine, to);
- ret = to->ppgtt->switch_mm(to->ppgtt, req);
+ ret = ppgtt->switch_mm(ppgtt, req);
if (ret)
goto unpin_out;
}
@@ -736,8 +716,7 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
* space. This means we must enforce that a page table load
* occur when this occurs. */
hw_flags = MI_RESTORE_INHIBIT;
- else if (to->ppgtt &&
- intel_engine_flag(engine) & to->ppgtt->pd_dirty_rings)
+ else if (ppgtt && intel_engine_flag(engine) & ppgtt->pd_dirty_rings)
hw_flags = MI_FORCE_RESTORE;
else
hw_flags = 0;
@@ -782,7 +761,7 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
*/
if (needs_pd_load_post(to, hw_flags)) {
trace_switch_mm(engine, to);
- ret = to->ppgtt->switch_mm(to->ppgtt, req);
+ ret = ppgtt->switch_mm(ppgtt, req);
/* The hardware context switch is emitted, but we haven't
* actually changed the state - so it's probably safe to bail
* here. Still, let the user know something dangerous has
@@ -792,8 +771,8 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
return ret;
}
- if (to->ppgtt)
- to->ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine);
+ if (ppgtt)
+ ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine);
for (i = 0; i < MAX_L3_SLICES; i++) {
if (!(to->remap_slice & (1<<i)))
@@ -848,15 +827,17 @@ int i915_switch_context(struct drm_i915_gem_request *req)
struct intel_context *to = req->ctx;
if (needs_pd_load_pre(engine, to)) {
+ struct i915_hw_ppgtt *ppgtt;
int ret;
+ ppgtt = to->ppgtt ?: req->i915->mm.aliasing_ppgtt;
+
trace_switch_mm(engine, to);
- ret = to->ppgtt->switch_mm(to->ppgtt, req);
+ ret = ppgtt->switch_mm(ppgtt, req);
if (ret)
return ret;
- /* Doing a PD load always reloads the page dirs */
- to->ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine);
+ ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine);
}
if (to != engine->last_context) {
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 69191ae2cd6a..45a17a9bf3ce 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2187,20 +2187,6 @@ int i915_ppgtt_init_hw(struct drm_device *dev)
return 0;
}
-int i915_ppgtt_init_ring(struct drm_i915_gem_request *req)
-{
- struct drm_i915_private *dev_priv = req->i915;
- struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
-
- if (i915.enable_execlists)
- return 0;
-
- if (!ppgtt)
- return 0;
-
- return ppgtt->switch_mm(ppgtt, req);
-}
-
struct i915_hw_ppgtt *
i915_ppgtt_create(struct drm_device *dev, struct drm_i915_file_private *fpriv)
{
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index b0ae6632c01a..114850368bca 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -522,7 +522,6 @@ void i915_ggtt_cleanup_hw(struct drm_device *dev);
int i915_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt);
int i915_ppgtt_init_hw(struct drm_device *dev);
-int i915_ppgtt_init_ring(struct drm_i915_gem_request *req);
void i915_ppgtt_release(struct kref *kref);
struct i915_hw_ppgtt *i915_ppgtt_create(struct drm_device *dev,
struct drm_i915_file_private *fpriv);
--
2.8.0.rc3
More information about the Intel-gfx-trybot
mailing list