From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Wed, 31 Jan 2018 10:16:26 +0100
Subject: drm/amdgpu: make VMID assignment more fair v2
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Git-commit: 8fe27f8fa08b30c2c515b06209c9de52b392a116
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Similar to finding an idle one before reuse.
This guarantees fairness between processes. Otherwise process with a reserved
VMID have an unfair advantage while scheduling jobs.
v2: improve commit message
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
@@ -268,11 +268,6 @@ int amdgpu_vmid_grab(struct amdgpu_vm *v
int r = 0;
mutex_lock(&id_mgr->lock);
- if (vm->reserved_vmid[vmhub]) {
- r = amdgpu_vmid_grab_reserved_locked(vm, ring, sync, fence, job);
- mutex_unlock(&id_mgr->lock);
- return r;
- }
fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
if (!fences) {
mutex_unlock(&id_mgr->lock);
@@ -319,6 +314,13 @@ int amdgpu_vmid_grab(struct amdgpu_vm *v
}
kfree(fences);
+ if (vm->reserved_vmid[vmhub]) {
+ r = amdgpu_vmid_grab_reserved_locked(vm, ring, sync,
+ fence, job);
+ mutex_unlock(&id_mgr->lock);
+ return r;
+ }
+
job->vm_needs_flush = vm->use_cpu_for_update;
/* Check if we can use a VMID already assigned to this VM */
list_for_each_entry_reverse(id, &id_mgr->ids_lru, list) {