On 25/03/2019 09:03, Chris Wilson wrote:
In order to separate the reservation phase of building a request from
its emission phase, we need to pull some of the request alloc activities
from deep inside i915_request to the surface, GEM_EXECBUFFER.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 106 +++++++++++++--------
drivers/gpu/drm/i915/i915_request.c | 9 --
2 files changed, 67 insertions(+), 48 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 3d672c9edb94..8754bb02c6ec 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -36,6 +36,7 @@
#include "i915_drv.h"
#include "i915_gem_clflush.h"
+#include "i915_gem_pm.h"
#include "i915_trace.h"
#include "intel_drv.h"
#include "intel_frontbuffer.h"
@@ -236,7 +237,8 @@ struct i915_execbuffer {
unsigned int *flags;
struct intel_engine_cs *engine; /** engine to queue the request to */
- struct i915_gem_context *ctx; /** context for building the request */
+ struct intel_context *context; /* logical state for the request */
+ struct i915_gem_context *gem_context; /** caller's context */
struct i915_address_space *vm; /** GTT and vma for the request */
struct i915_request *request; /** our request to build */
@@ -738,7 +740,7 @@ static int eb_select_context(struct i915_execbuffer *eb)
if (unlikely(!ctx))
return -ENOENT;
- eb->ctx = ctx;
+ eb->gem_context = ctx;
if (ctx->ppgtt) {
eb->vm = &ctx->ppgtt->vm;
eb->invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
@@ -761,7 +763,7 @@ static struct i915_request *__eb_wait_for_ring(struct intel_ring *ring)
* Completely unscientific finger-in-the-air estimates for suitable
* maximum user request size (to avoid blocking) and then backoff.
*/
- if (intel_ring_update_space(ring) >= PAGE_SIZE)
+ if (!ring || intel_ring_update_space(ring) >= PAGE_SIZE)
Move the comment explaining why ring can be NULL while moving the code?
return NULL;
/*
@@ -784,7 +786,6 @@ static struct i915_request *__eb_wait_for_ring(struct intel_ring *ring)
static int eb_wait_for_ring(const struct i915_execbuffer *eb)
{
- const struct intel_context *ce;
struct i915_request *rq;
int ret = 0;
@@ -794,11 +795,7 @@ static int eb_wait_for_ring(const struct i915_execbuffer *eb)
* keeping all of their resources pinned.
*/
- ce = intel_context_lookup(eb->ctx, eb->engine);
- if (!ce || !ce->ring) /* first use, assume empty! */
- return 0;
-
- rq = __eb_wait_for_ring(ce->ring);
+ rq = __eb_wait_for_ring(eb->context->ring);
if (rq) {
mutex_unlock(&eb->i915->drm.struct_mutex);
@@ -817,15 +814,15 @@ static int eb_wait_for_ring(const struct i915_execbuffer *eb)
static int eb_lookup_vmas(struct i915_execbuffer *eb)
{
- struct radix_tree_root *handles_vma = &eb->ctx->handles_vma;
+ struct radix_tree_root *handles_vma = &eb->gem_context->handles_vma;
struct drm_i915_gem_object *obj;
unsigned int i, batch;
int err;
- if (unlikely(i915_gem_context_is_closed(eb->ctx)))
+ if (unlikely(i915_gem_context_is_closed(eb->gem_context)))
return -ENOENT;
- if (unlikely(i915_gem_context_is_banned(eb->ctx)))
+ if (unlikely(i915_gem_context_is_banned(eb->gem_context)))
return -EIO;
INIT_LIST_HEAD(&eb->relocs);
@@ -870,8 +867,8 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
if (!vma->open_count++)
i915_vma_reopen(vma);
list_add(&lut->obj_link, &obj->lut_list);
- list_add(&lut->ctx_link, &eb->ctx->handles_list);
- lut->ctx = eb->ctx;
+ list_add(&lut->ctx_link, &eb->gem_context->handles_list);
+ lut->ctx = eb->gem_context;
lut->handle = handle;
add_vma:
@@ -1227,7 +1224,7 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
if (err)
goto err_unmap;
- rq = i915_request_alloc(eb->engine, eb->ctx);
+ rq = i915_request_create(eb->context);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto err_unpin;
@@ -2088,8 +2085,41 @@ static const enum intel_engine_id user_ring_map[I915_USER_RINGS + 1] = {
[I915_EXEC_VEBOX] = VECS0
};
-static struct intel_engine_cs *
-eb_select_engine(struct drm_i915_private *dev_priv,
+static int eb_pin_context(struct i915_execbuffer *eb,
+ struct intel_engine_cs *engine)
+{
+ struct intel_context *ce;
+ int err;
+
+ /*
+ * ABI: Before userspace accesses the GPU (e.g. execbuffer), report
+ * EIO if the GPU is already wedged.
+ */
+ err = i915_terminally_wedged(eb->i915);
+ if (err)
+ return err;
+
+ /*
+ * Pinning the contexts may generate requests in order to acquire
+ * GGTT space, so do this first before we reserve a seqno for
+ * ourselves.
+ */
+ ce = intel_context_pin(eb->gem_context, engine);
+ if (IS_ERR(ce))
+ return PTR_ERR(ce);
+
+ eb->engine = engine;
+ eb->context = ce;
+ return 0;
+}
+
+static void eb_unpin_context(struct i915_execbuffer *eb)
+{
+ intel_context_unpin(eb->context);
+}
+
+static int
+eb_select_engine(struct i915_execbuffer *eb,
struct drm_file *file,
struct drm_i915_gem_execbuffer2 *args)
{
@@ -2098,21 +2128,21 @@ eb_select_engine(struct drm_i915_private *dev_priv,
if (user_ring_id > I915_USER_RINGS) {
DRM_DEBUG("execbuf with unknown ring: %u\n", user_ring_id);
- return NULL;
+ return -EINVAL;
}
if ((user_ring_id != I915_EXEC_BSD) &&
((args->flags & I915_EXEC_BSD_MASK) != 0)) {
DRM_DEBUG("execbuf with non bsd ring but with invalid "
"bsd dispatch flags: %d\n", (int)(args->flags));
- return NULL;
+ return -EINVAL;
}
- if (user_ring_id == I915_EXEC_BSD && HAS_ENGINE(dev_priv, VCS1)) {
+ if (user_ring_id == I915_EXEC_BSD && HAS_ENGINE(eb->i915, VCS1)) {
unsigned int bsd_idx = args->flags & I915_EXEC_BSD_MASK;
if (bsd_idx == I915_EXEC_BSD_DEFAULT) {
- bsd_idx = gen8_dispatch_bsd_engine(dev_priv, file);
+ bsd_idx = gen8_dispatch_bsd_engine(eb->i915, file);
} else if (bsd_idx >= I915_EXEC_BSD_RING1 &&
bsd_idx <= I915_EXEC_BSD_RING2) {
bsd_idx >>= I915_EXEC_BSD_SHIFT;
@@ -2120,20 +2150,20 @@ eb_select_engine(struct drm_i915_private *dev_priv,
} else {
DRM_DEBUG("execbuf with unknown bsd ring: %u\n",
bsd_idx);
- return NULL;
+ return -EINVAL;
}
- engine = dev_priv->engine[_VCS(bsd_idx)];
+ engine = eb->i915->engine[_VCS(bsd_idx)];
} else {
- engine = dev_priv->engine[user_ring_map[user_ring_id]];
+ engine = eb->i915->engine[user_ring_map[user_ring_id]];
Cache dev_priv/i915 in a local?
}
if (!engine) {
DRM_DEBUG("execbuf with invalid ring: %u\n", user_ring_id);
- return NULL;
+ return -EINVAL;
}
- return engine;
+ return eb_pin_context(eb, engine);
}
static void
@@ -2275,7 +2305,6 @@ i915_gem_do_execbuffer(struct drm_device *dev,
struct i915_execbuffer eb;
struct dma_fence *in_fence = NULL;
struct sync_file *out_fence = NULL;
- intel_wakeref_t wakeref;
int out_fence_fd = -1;
int err;
@@ -2335,12 +2364,6 @@ i915_gem_do_execbuffer(struct drm_device *dev,
if (unlikely(err))
goto err_destroy;
- eb.engine = eb_select_engine(eb.i915, file, args);
- if (!eb.engine) {
- err = -EINVAL;
- goto err_engine;
- }
-
/*
* Take a local wakeref for preparing to dispatch the execbuf as
* we expect to access the hardware fairly frequently in the
@@ -2348,16 +2371,20 @@ i915_gem_do_execbuffer(struct drm_device *dev,
* wakeref that we hold until the GPU has been idle for at least
* 100ms.
*/
- wakeref = intel_runtime_pm_get(eb.i915);
+ i915_gem_unpark(eb.i915);
err = i915_mutex_lock_interruptible(dev);
if (err)
goto err_rpm;
- err = eb_wait_for_ring(&eb); /* may temporarily drop struct_mutex */
+ err = eb_select_engine(&eb, file, args);
if (unlikely(err))
goto err_unlock;
+ err = eb_wait_for_ring(&eb); /* may temporarily drop struct_mutex */
+ if (unlikely(err))
+ goto err_engine;
+
err = eb_relocate(&eb);
if (err) {
/*
@@ -2441,7 +2468,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
GEM_BUG_ON(eb.reloc_cache.rq);
/* Allocate a request for this batch buffer nice and early. */
- eb.request = i915_request_alloc(eb.engine, eb.ctx);
+ eb.request = i915_request_create(eb.context);
if (IS_ERR(eb.request)) {
err = PTR_ERR(eb.request);
goto err_batch_unpin;
@@ -2502,12 +2529,13 @@ i915_gem_do_execbuffer(struct drm_device *dev,
err_vma:
if (eb.exec)
eb_release_vmas(&eb);
+err_engine:
+ eb_unpin_context(&eb);
err_unlock:
mutex_unlock(&dev->struct_mutex);
err_rpm:
- intel_runtime_pm_put(eb.i915, wakeref);
-err_engine:
- i915_gem_context_put(eb.ctx);
+ i915_gem_park(eb.i915);
+ i915_gem_context_put(eb.gem_context);
err_destroy:
eb_destroy(&eb);
err_out_fence:
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index fd24f576ca61..10edeb285870 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -741,7 +741,6 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
struct drm_i915_private *i915 = engine->i915;
struct intel_context *ce;
struct i915_request *rq;
- int ret;
/*
* Preempt contexts are reserved for exclusive use to inject a
@@ -750,14 +749,6 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
*/
GEM_BUG_ON(ctx == i915->preempt_context);
- /*
- * ABI: Before userspace accesses the GPU (e.g. execbuffer), report
- * EIO if the GPU is already wedged.
- */
- ret = i915_terminally_wedged(i915);
- if (ret)
- return ERR_PTR(ret);
-
/*
* Pinning the contexts may generate requests in order to acquire
* GGTT space, so do this first before we reserve a seqno for
With the comment preserved:
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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