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drm/amdgpu: add option to disable semaphores 

Provide module parameter to enable/disable them. Still
enabled by default.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2015-09-05 11:12:27 +02:00 committed by Alex Deucher
parent 9fbcc7c007
commit 3daea9e3d3
3 changed files with 21 additions and 1 deletions
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1
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -82,6 +82,7 @@ extern int amdgpu_vm_block_size;
extern int amdgpu_enable_scheduler;
extern int amdgpu_sched_jobs;
extern int amdgpu_sched_hw_submission;
extern int amdgpu_enable_semaphores;
#define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS 3000
#define AMDGPU_MAX_USEC_TIMEOUT 100000 /* 100 ms */

4
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
View File

@ -79,6 +79,7 @@ int amdgpu_exp_hw_support = 0;
int amdgpu_enable_scheduler = 0;
int amdgpu_sched_jobs = 16;
int amdgpu_sched_hw_submission = 2;
int amdgpu_enable_semaphores = 1;
MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
@ -152,6 +153,9 @@ module_param_named(sched_jobs, amdgpu_sched_jobs, int, 0444);
MODULE_PARM_DESC(sched_hw_submission, "the max number of HW submissions (default 2)");
module_param_named(sched_hw_submission, amdgpu_sched_hw_submission, int, 0444);
MODULE_PARM_DESC(enable_semaphores, "Enable semaphores (1 = enable (default), 0 = disable)");
module_param_named(enable_semaphores, amdgpu_enable_semaphores, int, 0644);
static struct pci_device_id pciidlist[] = {
#ifdef CONFIG_DRM_AMDGPU_CIK
/* Kaveri */

17
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
View File

@ -251,6 +251,20 @@ int amdgpu_sync_wait(struct amdgpu_sync *sync)
fence_put(e->fence);
kfree(e);
}
if (amdgpu_enable_semaphores)
return 0;
for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
struct amdgpu_fence *fence = sync->sync_to[i];
if (!fence)
continue;
r = fence_wait(&fence->base, false);
if (r)
return r;
}
return 0;
}
@ -285,7 +299,8 @@ int amdgpu_sync_rings(struct amdgpu_sync *sync,
return -EINVAL;
}
if (amdgpu_enable_scheduler || (count >= AMDGPU_NUM_SYNCS)) {
if (amdgpu_enable_scheduler || !amdgpu_enable_semaphores ||
(count >= AMDGPU_NUM_SYNCS)) {
/* not enough room, wait manually */
r = fence_wait(&fence->base, false);
if (r)