[Intel-gfx] [PATCH 08/23] drm/i915: Use ww locking in intel_renderstate.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Wed May 20 13:00:15 UTC 2020
We want to start using ww locking in intel_context_pin, for this
we need to lock multiple objects, and the single i915_gem_object_lock
is not enough.
Convert to using ww-waiting, and make sure we always pin intel_context_state,
even if we don't have a renderstate object.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt.c | 21 +++---
drivers/gpu/drm/i915/gt/intel_renderstate.c | 78 ++++++++++++++-------
drivers/gpu/drm/i915/gt/intel_renderstate.h | 9 ++-
3 files changed, 72 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index f069551e412f..3c674aa76dae 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -398,21 +398,20 @@ static int __engines_record_defaults(struct intel_gt *gt)
/* We must be able to switch to something! */
GEM_BUG_ON(!engine->kernel_context);
- err = intel_renderstate_init(&so, engine);
- if (err)
- goto out;
-
ce = intel_context_create(engine);
if (IS_ERR(ce)) {
err = PTR_ERR(ce);
goto out;
}
- rq = intel_context_create_request(ce);
+ err = intel_renderstate_init(&so, ce);
+ if (err)
+ goto err;
+
+ rq = i915_request_create(ce);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
- intel_context_put(ce);
- goto out;
+ goto err_fini;
}
err = intel_engine_emit_ctx_wa(rq);
@@ -426,9 +425,13 @@ static int __engines_record_defaults(struct intel_gt *gt)
err_rq:
requests[id] = i915_request_get(rq);
i915_request_add(rq);
- intel_renderstate_fini(&so);
- if (err)
+err_fini:
+ intel_renderstate_fini(&so, ce);
+err:
+ if (err) {
+ intel_context_put(ce);
goto out;
+ }
}
/* Flush the default context image to memory, and enable powersaving. */
diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.c b/drivers/gpu/drm/i915/gt/intel_renderstate.c
index d133e6b40d6c..a289f22ced3b 100644
--- a/drivers/gpu/drm/i915/gt/intel_renderstate.c
+++ b/drivers/gpu/drm/i915/gt/intel_renderstate.c
@@ -27,6 +27,7 @@
#include "i915_drv.h"
#include "intel_renderstate.h"
+#include "gt/intel_context.h"
#include "intel_ring.h"
static const struct intel_renderstate_rodata *
@@ -74,10 +75,9 @@ static int render_state_setup(struct intel_renderstate *so,
u32 *d;
int ret;
- i915_gem_object_lock(so->vma->obj, NULL);
ret = i915_gem_object_prepare_write(so->vma->obj, &needs_clflush);
if (ret)
- goto out_unlock;
+ return ret;
d = kmap_atomic(i915_gem_object_get_dirty_page(so->vma->obj, 0));
@@ -158,8 +158,6 @@ static int render_state_setup(struct intel_renderstate *so,
ret = 0;
out:
i915_gem_object_finish_access(so->vma->obj);
-out_unlock:
- i915_gem_object_unlock(so->vma->obj);
return ret;
err:
@@ -171,33 +169,47 @@ static int render_state_setup(struct intel_renderstate *so,
#undef OUT_BATCH
int intel_renderstate_init(struct intel_renderstate *so,
- struct intel_engine_cs *engine)
+ struct intel_context *ce)
{
- struct drm_i915_gem_object *obj;
+ struct intel_engine_cs *engine = ce->engine;
+ struct drm_i915_gem_object *obj = NULL;
int err;
memset(so, 0, sizeof(*so));
so->rodata = render_state_get_rodata(engine);
- if (!so->rodata)
- return 0;
+ if (so->rodata) {
+ if (so->rodata->batch_items * 4 > PAGE_SIZE)
+ return -EINVAL;
+
+ obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ so->vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL);
+ if (IS_ERR(so->vma)) {
+ err = PTR_ERR(so->vma);
+ goto err_obj;
+ }
+ }
- if (so->rodata->batch_items * 4 > PAGE_SIZE)
- return -EINVAL;
+ i915_gem_ww_ctx_init(&so->ww, true);
+retry:
+ err = intel_context_pin(ce);
+ if (err)
+ goto err_fini;
- obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
- if (IS_ERR(obj))
- return PTR_ERR(obj);
+ /* return early if there's nothing to setup */
+ if (!err && !so->rodata)
+ return 0;
- so->vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL);
- if (IS_ERR(so->vma)) {
- err = PTR_ERR(so->vma);
- goto err_obj;
- }
+ err = i915_gem_object_lock(so->vma->obj, &so->ww);
+ if (err)
+ goto err_context;
err = i915_vma_pin(so->vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
if (err)
- goto err_obj;
+ goto err_context;
err = render_state_setup(so, engine->i915);
if (err)
@@ -207,8 +219,18 @@ int intel_renderstate_init(struct intel_renderstate *so,
err_unpin:
i915_vma_unpin(so->vma);
+err_context:
+ intel_context_unpin(ce);
+err_fini:
+ if (err == -EDEADLK) {
+ err = i915_gem_ww_ctx_backoff(&so->ww);
+ if (!err)
+ goto retry;
+ }
+ i915_gem_ww_ctx_fini(&so->ww);
err_obj:
- i915_gem_object_put(obj);
+ if (obj)
+ i915_gem_object_put(obj);
so->vma = NULL;
return err;
}
@@ -222,11 +244,9 @@ int intel_renderstate_emit(struct intel_renderstate *so,
if (!so->vma)
return 0;
- i915_vma_lock(so->vma);
err = i915_request_await_object(rq, so->vma->obj, false);
if (err == 0)
err = i915_vma_move_to_active(so->vma, rq, 0);
- i915_vma_unlock(so->vma);
if (err)
return err;
@@ -247,7 +267,17 @@ int intel_renderstate_emit(struct intel_renderstate *so,
return 0;
}
-void intel_renderstate_fini(struct intel_renderstate *so)
+void intel_renderstate_fini(struct intel_renderstate *so,
+ struct intel_context *ce)
{
- i915_vma_unpin_and_release(&so->vma, 0);
+ if (so->vma) {
+ i915_vma_unpin(so->vma);
+ i915_vma_close(so->vma);
+ }
+
+ intel_context_unpin(ce);
+ i915_gem_ww_ctx_fini(&so->ww);
+
+ if (so->vma)
+ i915_gem_object_put(so->vma->obj);
}
diff --git a/drivers/gpu/drm/i915/gt/intel_renderstate.h b/drivers/gpu/drm/i915/gt/intel_renderstate.h
index 5700be69a05a..713aa1e86c80 100644
--- a/drivers/gpu/drm/i915/gt/intel_renderstate.h
+++ b/drivers/gpu/drm/i915/gt/intel_renderstate.h
@@ -25,9 +25,10 @@
#define _INTEL_RENDERSTATE_H_
#include <linux/types.h>
+#include "i915_gem.h"
struct i915_request;
-struct intel_engine_cs;
+struct intel_context;
struct i915_vma;
struct intel_renderstate_rodata {
@@ -49,6 +50,7 @@ extern const struct intel_renderstate_rodata gen8_null_state;
extern const struct intel_renderstate_rodata gen9_null_state;
struct intel_renderstate {
+ struct i915_gem_ww_ctx ww;
const struct intel_renderstate_rodata *rodata;
struct i915_vma *vma;
u32 batch_offset;
@@ -58,9 +60,10 @@ struct intel_renderstate {
};
int intel_renderstate_init(struct intel_renderstate *so,
- struct intel_engine_cs *engine);
+ struct intel_context *ce);
int intel_renderstate_emit(struct intel_renderstate *so,
struct i915_request *rq);
-void intel_renderstate_fini(struct intel_renderstate *so);
+void intel_renderstate_fini(struct intel_renderstate *so,
+ struct intel_context *ce);
#endif /* _INTEL_RENDERSTATE_H_ */
--
2.26.2
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