From 76604fd6907fdc519ffaac29168b54a2816b175f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Wed, 9 Nov 2022 19:54:09 +0100
Subject: drm/amdgpu: use the last IB as gang leader v2
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Git-commit: eca13f3c67b6ddfcc61fdb9bb1c5f9a7724e2359
Patch-mainline: v6.1-rc6
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
It turned out that not the last IB specified is the gang leader,
but instead the last job allocated.
This is a bit unfortunate and not very intuitive for the CS
interface, so try to fix this.
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221115094206.6181-1-christian.koenig@amd.com
Tested-by: Timur Kristóf <timur.kristof@gmail.com>
Acked-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Fixes: 4624459c84d7 ("drm/amdgpu: add gang submit frontend v6")
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 23 ++++++++++++++++-------
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h | 1 +
2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index d371000a5727..de5cb056c9ad 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -109,6 +109,7 @@ static int amdgpu_cs_p1_ib(struct amdgpu_cs_parser *p,
return r;
++(num_ibs[r]);
+ p->gang_leader_idx = r;
return 0;
}
@@ -300,7 +301,7 @@ static int amdgpu_cs_pass1(struct amdgpu_cs_parser *p,
if (ret)
goto free_all_kdata;
}
- p->gang_leader = p->jobs[p->gang_size - 1];
+ p->gang_leader = p->jobs[p->gang_leader_idx];
if (p->ctx->vram_lost_counter != p->gang_leader->vram_lost_counter) {
ret = -ECANCELED;
@@ -1195,16 +1196,18 @@ static int amdgpu_cs_sync_rings(struct amdgpu_cs_parser *p)
return r;
}
- for (i = 0; i < p->gang_size - 1; ++i) {
+ for (i = 0; i < p->gang_size; ++i) {
+ if (p->jobs[i] == leader)
+ continue;
+
r = amdgpu_sync_clone(&leader->sync, &p->jobs[i]->sync);
if (r)
return r;
}
- r = amdgpu_ctx_wait_prev_fence(p->ctx, p->entities[p->gang_size - 1]);
+ r = amdgpu_ctx_wait_prev_fence(p->ctx, p->entities[p->gang_leader_idx]);
if (r && r != -ERESTARTSYS)
DRM_ERROR("amdgpu_ctx_wait_prev_fence failed.\n");
-
return r;
}
@@ -1238,9 +1241,12 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
for (i = 0; i < p->gang_size; ++i)
drm_sched_job_arm(&p->jobs[i]->base);
- for (i = 0; i < (p->gang_size - 1); ++i) {
+ for (i = 0; i < p->gang_size; ++i) {
struct dma_fence *fence;
+ if (p->jobs[i] == leader)
+ continue;
+
fence = &p->jobs[i]->base.s_fence->scheduled;
r = amdgpu_sync_fence(&leader->sync, fence);
if (r)
@@ -1276,7 +1282,10 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
list_for_each_entry(e, &p->validated, tv.head) {
/* Everybody except for the gang leader uses READ */
- for (i = 0; i < (p->gang_size - 1); ++i) {
+ for (i = 0; i < p->gang_size; ++i) {
+ if (p->jobs[i] == leader)
+ continue;
+
dma_resv_add_fence(e->tv.bo->base.resv,
&p->jobs[i]->base.s_fence->finished,
DMA_RESV_USAGE_READ);
@@ -1286,7 +1295,7 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
e->tv.num_shared = 0;
}
- seq = amdgpu_ctx_add_fence(p->ctx, p->entities[p->gang_size - 1],
+ seq = amdgpu_ctx_add_fence(p->ctx, p->entities[p->gang_leader_idx],
p->fence);
amdgpu_cs_post_dependencies(p);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h
index cbaa19b2b8a3..f80adf9069ec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.h
@@ -54,6 +54,7 @@ struct amdgpu_cs_parser {
/* scheduler job objects */
unsigned int gang_size;
+ unsigned int gang_leader_idx;
struct drm_sched_entity *entities[AMDGPU_CS_GANG_SIZE];
struct amdgpu_job *jobs[AMDGPU_CS_GANG_SIZE];
struct amdgpu_job *gang_leader;
--
2.38.1