[Intel-gfx] [PATCH 03/20] drm/i915: Separate lookup and pinning in execbuf.
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Tue Feb 25 14:38:07 UTC 2020
We want to get rid of struct mutex, but vma reservation was entangled
with vma lookup. Make vma lookup and validation a preparation step,
and vma pinning a repeatable step. This allows us to keep all the looked
up information when dropping all locks, which saves an extra lookup during
relocation slowpath.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 98 ++++++++++---------
drivers/gpu/drm/i915/i915_drv.h | 6 --
2 files changed, 54 insertions(+), 50 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index efec64e92a74..9970f5111daa 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -57,8 +57,7 @@ enum {
#define __EXEC_OBJECT_RESERVED (__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_FENCE)
#define __EXEC_HAS_RELOC BIT(31)
-#define __EXEC_VALIDATED BIT(30)
-#define __EXEC_INTERNAL_FLAGS (~0u << 30)
+#define __EXEC_INTERNAL_FLAGS (~0u << 31)
#define UPDATE PIN_OFFSET_FIXED
#define BATCH_OFFSET_BIAS (256*1024)
@@ -484,11 +483,9 @@ eb_add_vma(struct i915_execbuffer *eb,
GEM_BUG_ON(i915_vma_is_closed(vma));
- if (!(eb->args->flags & __EXEC_VALIDATED)) {
- err = eb_validate_vma(eb, entry, vma);
- if (unlikely(err))
- return err;
- }
+ err = eb_validate_vma(eb, entry, vma);
+ if (unlikely(err))
+ return err;
ev->vma = vma;
ev->exec = entry;
@@ -523,20 +520,7 @@ eb_add_vma(struct i915_execbuffer *eb,
eb->batch = ev;
}
- err = 0;
- if (eb_pin_vma(eb, entry, ev)) {
- if (entry->offset != vma->node.start) {
- entry->offset = vma->node.start | UPDATE;
- eb->args->flags |= __EXEC_HAS_RELOC;
- }
- } else {
- eb_unreserve_vma(ev);
-
- list_add_tail(&ev->bind_link, &eb->unbound);
- if (drm_mm_node_allocated(&vma->node))
- err = i915_vma_unbind(vma);
- }
- return err;
+ return 0;
}
static inline int use_cpu_reloc(const struct reloc_cache *cache,
@@ -727,7 +711,6 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
int err;
INIT_LIST_HEAD(&eb->relocs);
- INIT_LIST_HEAD(&eb->unbound);
batch = eb_batch_index(eb);
@@ -784,15 +767,11 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
err = eb_add_vma(eb, i, batch, vma);
if (unlikely(err))
goto err_vma;
-
- GEM_BUG_ON(drm_mm_node_allocated(&vma->node) &&
- eb_vma_misplaced(&eb->exec[i], vma, eb->vma[i].flags));
}
mutex_unlock(&eb->gem_context->mutex);
- eb->args->flags |= __EXEC_VALIDATED;
- return eb_reserve(eb);
+ return 0;
err_obj:
i915_gem_object_put(obj);
@@ -803,6 +782,41 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
return err;
}
+static int eb_validate_vmas(struct i915_execbuffer *eb)
+{
+ unsigned int i;
+ int err;
+
+ INIT_LIST_HEAD(&eb->unbound);
+
+ for (i = 0; i < eb->buffer_count; i++) {
+ struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
+ struct eb_vma *ev = &eb->vma[i];
+ struct i915_vma *vma = ev->vma;
+
+ if (eb_pin_vma(eb, entry, ev)) {
+ if (entry->offset != vma->node.start) {
+ entry->offset = vma->node.start | UPDATE;
+ eb->args->flags |= __EXEC_HAS_RELOC;
+ }
+ } else {
+ eb_unreserve_vma(ev);
+
+ list_add_tail(&ev->bind_link, &eb->unbound);
+ if (drm_mm_node_allocated(&vma->node)) {
+ err = i915_vma_unbind(vma);
+ if (err)
+ return err;
+ }
+ }
+
+ GEM_BUG_ON(drm_mm_node_allocated(&vma->node) &&
+ eb_vma_misplaced(&eb->exec[i], vma, ev->flags));
+ }
+
+ return eb_reserve(eb);
+}
+
static struct eb_vma *
eb_get_vma(const struct i915_execbuffer *eb, unsigned long handle)
{
@@ -835,22 +849,12 @@ static void eb_release_vmas(const struct i915_execbuffer *eb)
if (!vma)
break;
- eb->vma[i].vma = NULL;
-
- if (ev->flags & __EXEC_OBJECT_HAS_PIN)
- __eb_unreserve_vma(vma, ev->flags);
+ eb_unreserve_vma(ev);
if (ev->flags & __EXEC_OBJECT_HAS_REF)
i915_vma_put(vma);
- }
-}
-static void eb_reset_vmas(const struct i915_execbuffer *eb)
-{
- eb_release_vmas(eb);
- if (eb->lut_size > 0)
- memset(eb->buckets, 0,
- sizeof(struct hlist_head) << eb->lut_size);
+ }
}
static void eb_destroy(const struct i915_execbuffer *eb)
@@ -1662,7 +1666,7 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
}
/* We may process another execbuffer during the unlock... */
- eb_reset_vmas(eb);
+ eb_release_vmas(eb);
mutex_unlock(&dev->struct_mutex);
/*
@@ -1695,14 +1699,14 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
/* A frequent cause for EAGAIN are currently unavailable client pages */
flush_workqueue(eb->i915->mm.userptr_wq);
- err = i915_mutex_lock_interruptible(dev);
+ err = mutex_lock_interruptible(&dev->struct_mutex);
if (err) {
mutex_lock(&dev->struct_mutex);
goto out;
}
/* reacquire the objects */
- err = eb_lookup_vmas(eb);
+ err = eb_validate_vmas(eb);
if (err)
goto err;
@@ -1756,7 +1760,13 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
static int eb_relocate(struct i915_execbuffer *eb)
{
- if (eb_lookup_vmas(eb))
+ int err;
+
+ err = eb_lookup_vmas(eb);
+ if (err)
+ return err;
+
+ if (eb_validate_vmas(eb))
goto slow;
/* The objects are in their final locations, apply the relocations. */
@@ -2640,7 +2650,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
if (unlikely(err))
goto err_context;
- err = i915_mutex_lock_interruptible(dev);
+ err = mutex_lock_interruptible(&dev->struct_mutex);
if (err)
goto err_engine;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 88e4fb8ac739..567dc7106286 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1824,12 +1824,6 @@ int i915_gem_object_unbind(struct drm_i915_gem_object *obj,
void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv);
-static inline int __must_check
-i915_mutex_lock_interruptible(struct drm_device *dev)
-{
- return mutex_lock_interruptible(&dev->struct_mutex);
-}
-
int i915_gem_dumb_create(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
--
2.25.0.24.g3f081b084b0
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