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.
Signed-off-by: Marek Olšák <marek.olsak@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon.h | 2 +-
drivers/gpu/drm/radeon/radeon_cs.c | 53 ++++++++++++++++++++++++++++++++--
drivers/gpu/drm/radeon/radeon_object.c | 10 -------
drivers/gpu/drm/radeon/radeon_object.h | 2 --
4 files changed, 51 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index d37a57a..f7a3174 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -481,7 +481,7 @@ struct radeon_bo_list {
struct ttm_validate_buffer tv;
struct radeon_bo *bo;
uint64_t gpu_offset;
- bool written;
+ unsigned priority;
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..1ba1a48 100644
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -31,6 +31,41 @@
#include "radeon.h"
#include "radeon_trace.h"
+/* This is a variation of the bucket sort with O(n) time complexity.
+ * The relocations are sorted from the highest to the lowest priority. */
+static void sort_relocs_for_validation(struct list_head *list)
+{
+ struct list_head bucket[17], *it, *tmp;
+ unsigned i, priority;
+
+ for (i = 0; i < 17; i++)
+ INIT_LIST_HEAD(&bucket[i]);
+
+ /* Move the elements into buckets. An i-th bucket only contains
+ * elements with priorities i*2 and i*2+1. Odd numbers are added
+ * at the head of a bucket and even numbers are added at the tail,
+ * therefore all buckets are always sorted. */
+ list_for_each_safe(it, tmp, list) {
+ priority = list_entry(it, struct radeon_bo_list,
+ tv.head)->priority;
+ i = priority / 2;
+ i = min(i, 16u) ;
+
+ if (priority % 2 == 1) {
+ list_move(it, &bucket[i]);
+ } else {
+ list_move_tail(it, &bucket[i]);
+ }
+ }
+
+ INIT_LIST_HEAD(list);
+
+ /* connect the sorted buckets */
+ for (i = 0; i < 17; i++) {
+ list_splice(&bucket[i], list);
+ }
+}
+
static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
{
struct drm_device *ddev = p->rdev->ddev;
@@ -80,7 +115,15 @@ 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. Numbers 32 and 33 are reserved for the kernel
+ * driver.
+ */
+ p->relocs[i].lobj.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 +137,8 @@ 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 */
+ p->relocs[i].lobj.priority = 32;
} else {
uint32_t domain = r->write_domain ?
r->write_domain : r->read_domains;
@@ -107,9 +152,11 @@ 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);
+ list_add(&p->relocs[i].lobj.tv.head, &p->validated);
}
+
+ sort_relocs_for_validation(&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 d676ee2..19042ae 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -368,16 +368,6 @@ 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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