From: Marek Olšák <marek.olsak@xxxxxxx>
Userspace should set the first 4 bits of drm_radeon_cs_reloc::flags to
a number from 0 to 15. The higher the number, the higher the priority,
which means a buffer with a higher number will be validated sooner.
The old behavior is preserved: Buffers used for write are prioritized over
read-only buffers if the userspace doesn't set the number.
v2: add buffers to buckets directly, then concatenate them
v3: use a stable sort
Signed-off-by: Marek Olšák <marek.olsak@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon.h | 1 -
drivers/gpu/drm/radeon/radeon_cs.c | 64 ++++++++++++++++++++++++++++++++--
drivers/gpu/drm/radeon/radeon_object.c | 10 ------
drivers/gpu/drm/radeon/radeon_object.h | 2 --
4 files changed, 61 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index df28613..ec719e8 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -481,7 +481,6 @@ struct radeon_bo_list {
struct ttm_validate_buffer tv;
struct radeon_bo *bo;
uint64_t gpu_offset;
- bool written;
unsigned domain;
unsigned alt_domain;
u32 tiling_flags;
diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index d49a3f7..07e1651 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -31,10 +31,52 @@
#include "radeon.h"
#include "radeon_trace.h"
+#define RADEON_CS_MAX_PRIORITY 32u
+#define RADEON_CS_NUM_BUCKETS (RADEON_CS_MAX_PRIORITY + 1)
+
+/* This is based on the bucket sort with O(n) time complexity.
+ * An item with priority "i" is added to bucket[i]. The lists are then
+ * concatenated in descending order.
+ */
+struct radeon_cs_buckets {
+ struct list_head bucket[RADEON_CS_NUM_BUCKETS];
+};
+
+static void radeon_cs_buckets_init(struct radeon_cs_buckets *b)
+{
+ unsigned i;
+
+ for (i = 0; i < RADEON_CS_NUM_BUCKETS; i++)
+ INIT_LIST_HEAD(&b->bucket[i]);
+}
+
+static void radeon_cs_buckets_add(struct radeon_cs_buckets *b,
+ struct list_head *item, unsigned priority)
+{
+ /* Since buffers which appear sooner in the relocation list are
+ * likely to be used more often than buffers which appear later
+ * in the list, the sort mustn't change the ordering of buffers
+ * with the same priority, i.e. it must be stable.
+ */
+ list_add_tail(item, &b->bucket[min(priority, RADEON_CS_MAX_PRIORITY)]);
+}
+
+static void radeon_cs_buckets_get_list(struct radeon_cs_buckets *b,
+ struct list_head *out_list)
+{
+ unsigned i;
+
+ /* Connect the sorted buckets in the output list. */
+ for (i = 0; i < RADEON_CS_NUM_BUCKETS; i++) {
+ list_splice(&b->bucket[i], out_list);
+ }
+}
+
static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
{
struct drm_device *ddev = p->rdev->ddev;
struct radeon_cs_chunk *chunk;
+ struct radeon_cs_buckets buckets;
unsigned i, j;
bool duplicate;
@@ -53,8 +95,12 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
if (p->relocs == NULL) {
return -ENOMEM;
}
+
+ radeon_cs_buckets_init(&buckets);
+
for (i = 0; i < p->nrelocs; i++) {
struct drm_radeon_cs_reloc *r;
+ unsigned priority;
duplicate = false;
r = (struct drm_radeon_cs_reloc *)&chunk->kdata[i*4];
@@ -80,7 +126,14 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
p->relocs_ptr[i] = &p->relocs[i];
p->relocs[i].robj = gem_to_radeon_bo(p->relocs[i].gobj);
p->relocs[i].lobj.bo = p->relocs[i].robj;
- p->relocs[i].lobj.written = !!r->write_domain;
+
+ /* The userspace buffer priorities are from 0 to 15. A higher
+ * number means the buffer is more important.
+ * Also, the buffers used for write have a higher priority than
+ * the buffers used for read only, which doubles the range
+ * to 0 to 31. 32 is reserved for the kernel driver.
+ */
+ priority = (r->flags & 0xf) * 2 + !!r->write_domain;
/* the first reloc of an UVD job is the msg and that must be in
VRAM, also but everything into VRAM on AGP cards to avoid
@@ -94,6 +147,8 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
p->relocs[i].lobj.alt_domain =
RADEON_GEM_DOMAIN_VRAM;
+ /* prioritize this over any other relocation */
+ priority = RADEON_CS_MAX_PRIORITY;
} else {
uint32_t domain = r->write_domain ?
r->write_domain : r->read_domains;
@@ -107,9 +162,12 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
p->relocs[i].lobj.tv.bo = &p->relocs[i].robj->tbo;
p->relocs[i].handle = r->handle;
- radeon_bo_list_add_object(&p->relocs[i].lobj,
- &p->validated);
+ radeon_cs_buckets_add(&buckets, &p->relocs[i].lobj.tv.head,
+ priority);
}
+
+ radeon_cs_buckets_get_list(&buckets, &p->validated);
+
return radeon_bo_list_validate(&p->ticket, &p->validated, p->ring);
}
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 282d6a2..8399fe0 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -366,16 +366,6 @@ void radeon_bo_fini(struct radeon_device *rdev)
arch_phys_wc_del(rdev->mc.vram_mtrr);
}
-void radeon_bo_list_add_object(struct radeon_bo_list *lobj,
- struct list_head *head)
-{
- if (lobj->written) {
- list_add(&lobj->tv.head, head);
- } else {
- list_add_tail(&lobj->tv.head, head);
- }
-}
-
int radeon_bo_list_validate(struct ww_acquire_ctx *ticket,
struct list_head *head, int ring)
{
diff --git a/drivers/gpu/drm/radeon/radeon_object.h b/drivers/gpu/drm/radeon/radeon_object.h
index a9a8c11..6c3ca9e 100644
--- a/drivers/gpu/drm/radeon/radeon_object.h
+++ b/drivers/gpu/drm/radeon/radeon_object.h
@@ -138,8 +138,6 @@ extern int radeon_bo_evict_vram(struct radeon_device *rdev);
extern void radeon_bo_force_delete(struct radeon_device *rdev);
extern int radeon_bo_init(struct radeon_device *rdev);
extern void radeon_bo_fini(struct radeon_device *rdev);
-extern void radeon_bo_list_add_object(struct radeon_bo_list *lobj,
- struct list_head *head);
extern int radeon_bo_list_validate(struct ww_acquire_ctx *ticket,
struct list_head *head, int ring);
extern int radeon_bo_fbdev_mmap(struct radeon_bo *bo,
--
1.8.3.2
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