[Intel-gfx] [PATCH v2 04/24] Revert "drm/i915/gem: Split eb_vma into its own allocation"
Maarten Lankhorst
maarten.lankhorst at linux.intel.com
Wed Aug 19 14:08:44 UTC 2020
This reverts commit 0f1dd02295f3 ("drm/i915/gem: Split eb_vma into
its own allocation") and also moves all unreserving to a single
place at the end, which is a minor simplification.
With the WW locking, we will drop all references only at the
end when unlocking, so refcounting can now be removed.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 124 +++++++-----------
1 file changed, 51 insertions(+), 73 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index e8d713f78323..ccaaf9e599a0 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -41,11 +41,6 @@ struct eb_vma {
u32 handle;
};
-struct eb_vma_array {
- struct kref kref;
- struct eb_vma vma[];
-};
-
enum {
FORCE_CPU_RELOC = 1,
FORCE_GTT_RELOC,
@@ -58,6 +53,7 @@ enum {
#define __EXEC_OBJECT_NEEDS_MAP BIT(29)
#define __EXEC_OBJECT_NEEDS_BIAS BIT(28)
#define __EXEC_OBJECT_INTERNAL_FLAGS (~0u << 28) /* all of the above */
+#define __EXEC_OBJECT_RESERVED (__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_FENCE)
#define __EXEC_HAS_RELOC BIT(31)
#define __EXEC_INTERNAL_FLAGS (~0u << 31)
@@ -295,7 +291,6 @@ struct i915_execbuffer {
*/
int lut_size;
struct hlist_head *buckets; /** ht for relocation handles */
- struct eb_vma_array *array;
struct eb_fence *fences;
unsigned long num_fences;
@@ -308,62 +303,8 @@ static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
eb->args->batch_len);
}
-static struct eb_vma_array *eb_vma_array_create(unsigned int count)
-{
- struct eb_vma_array *arr;
-
- arr = kvmalloc(struct_size(arr, vma, count), GFP_KERNEL | __GFP_NOWARN);
- if (!arr)
- return NULL;
-
- kref_init(&arr->kref);
- arr->vma[0].vma = NULL;
-
- return arr;
-}
-
-static inline void eb_unreserve_vma(struct eb_vma *ev)
-{
- struct i915_vma *vma = ev->vma;
-
- if (unlikely(ev->flags & __EXEC_OBJECT_HAS_FENCE))
- __i915_vma_unpin_fence(vma);
-
- if (ev->flags & __EXEC_OBJECT_HAS_PIN)
- __i915_vma_unpin(vma);
-
- ev->flags &= ~(__EXEC_OBJECT_HAS_PIN |
- __EXEC_OBJECT_HAS_FENCE);
-}
-
-static void eb_vma_array_destroy(struct kref *kref)
-{
- struct eb_vma_array *arr = container_of(kref, typeof(*arr), kref);
- struct eb_vma *ev = arr->vma;
-
- while (ev->vma) {
- eb_unreserve_vma(ev);
- i915_vma_put(ev->vma);
- ev++;
- }
-
- kvfree(arr);
-}
-
-static void eb_vma_array_put(struct eb_vma_array *arr)
-{
- kref_put(&arr->kref, eb_vma_array_destroy);
-}
-
static int eb_create(struct i915_execbuffer *eb)
{
- /* Allocate an extra slot for use by the command parser + sentinel */
- eb->array = eb_vma_array_create(eb->buffer_count + 2);
- if (!eb->array)
- return -ENOMEM;
-
- eb->vma = eb->array->vma;
-
if (!(eb->args->flags & I915_EXEC_HANDLE_LUT)) {
unsigned int size = 1 + ilog2(eb->buffer_count);
@@ -397,10 +338,8 @@ static int eb_create(struct i915_execbuffer *eb)
break;
} while (--size);
- if (unlikely(!size)) {
- eb_vma_array_put(eb->array);
+ if (unlikely(!size))
return -ENOMEM;
- }
eb->lut_size = size;
} else {
@@ -511,6 +450,26 @@ eb_pin_vma(struct i915_execbuffer *eb,
return !eb_vma_misplaced(entry, vma, ev->flags);
}
+static inline void __eb_unreserve_vma(struct i915_vma *vma, unsigned int flags)
+{
+ GEM_BUG_ON(!(flags & __EXEC_OBJECT_HAS_PIN));
+
+ if (unlikely(flags & __EXEC_OBJECT_HAS_FENCE))
+ __i915_vma_unpin_fence(vma);
+
+ __i915_vma_unpin(vma);
+}
+
+static inline void
+eb_unreserve_vma(struct eb_vma *ev)
+{
+ if (!(ev->flags & __EXEC_OBJECT_HAS_PIN))
+ return;
+
+ __eb_unreserve_vma(ev->vma, ev->flags);
+ ev->flags &= ~__EXEC_OBJECT_RESERVED;
+}
+
static int
eb_validate_vma(struct i915_execbuffer *eb,
struct drm_i915_gem_exec_object2 *entry,
@@ -933,13 +892,31 @@ eb_get_vma(const struct i915_execbuffer *eb, unsigned long handle)
}
}
+static void eb_release_vmas(const struct i915_execbuffer *eb)
+{
+ const unsigned int count = eb->buffer_count;
+ unsigned int i;
+
+ for (i = 0; i < count; i++) {
+ struct eb_vma *ev = &eb->vma[i];
+ struct i915_vma *vma = ev->vma;
+
+ if (!vma)
+ break;
+
+ eb->vma[i].vma = NULL;
+
+ if (ev->flags & __EXEC_OBJECT_HAS_PIN)
+ __eb_unreserve_vma(vma, ev->flags);
+
+ i915_vma_put(vma);
+ }
+}
+
static void eb_destroy(const struct i915_execbuffer *eb)
{
GEM_BUG_ON(eb->reloc_cache.rq);
- if (eb->array)
- eb_vma_array_put(eb->array);
-
if (eb->lut_size > 0)
kfree(eb->buckets);
}
@@ -2021,12 +1998,9 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
err = i915_vma_move_to_active(vma, eb->request, flags);
i915_vma_unlock(vma);
- eb_unreserve_vma(ev);
}
ww_acquire_fini(&acquire);
- eb_vma_array_put(fetch_and_zero(&eb->array));
-
if (unlikely(err))
goto err_skip;
@@ -2323,7 +2297,6 @@ static int eb_parse(struct i915_execbuffer *eb)
eb->vma[eb->buffer_count].vma = i915_vma_get(shadow);
eb->vma[eb->buffer_count].flags = __EXEC_OBJECT_HAS_PIN;
eb->batch = &eb->vma[eb->buffer_count++];
- eb->vma[eb->buffer_count].vma = NULL;
eb->trampoline = trampoline;
eb->batch_start_offset = 0;
@@ -2989,6 +2962,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
args->flags |= __EXEC_HAS_RELOC;
eb.exec = exec;
+ eb.vma = (struct eb_vma *)(exec + args->buffer_count + 1);
+ eb.vma[0].vma = NULL;
eb.invalid_flags = __EXEC_OBJECT_UNKNOWN_FLAGS;
reloc_cache_init(&eb.reloc_cache, eb.i915);
@@ -3198,6 +3173,8 @@ i915_gem_do_execbuffer(struct drm_device *dev,
if (batch->private)
intel_gt_buffer_pool_put(batch->private);
err_vma:
+ if (eb.exec)
+ eb_release_vmas(&eb);
if (eb.trampoline)
i915_vma_unpin(eb.trampoline);
eb_unpin_engine(&eb);
@@ -3217,7 +3194,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
static size_t eb_element_size(void)
{
- return sizeof(struct drm_i915_gem_exec_object2);
+ return sizeof(struct drm_i915_gem_exec_object2) + sizeof(struct eb_vma);
}
static bool check_buffer_count(size_t count)
@@ -3273,7 +3250,7 @@ i915_gem_execbuffer_ioctl(struct drm_device *dev, void *data,
/* Copy in the exec list from userland */
exec_list = kvmalloc_array(count, sizeof(*exec_list),
__GFP_NOWARN | GFP_KERNEL);
- exec2_list = kvmalloc_array(count, eb_element_size(),
+ exec2_list = kvmalloc_array(count + 1, eb_element_size(),
__GFP_NOWARN | GFP_KERNEL);
if (exec_list == NULL || exec2_list == NULL) {
drm_dbg(&i915->drm,
@@ -3350,7 +3327,8 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
if (err)
return err;
- exec2_list = kvmalloc_array(count, eb_element_size(),
+ /* Allocate an extra slot for use by the command parser */
+ exec2_list = kvmalloc_array(count + 1, eb_element_size(),
__GFP_NOWARN | GFP_KERNEL);
if (exec2_list == NULL) {
drm_dbg(&i915->drm, "Failed to allocate exec list for %zd buffers\n",
--
2.28.0
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