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>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 668939a14206b4113991b69636915d562ea3d55c..e587e20074d3593b9e7515d4fffa7be6885efea8 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -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 */

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 0fcc0bd1622cf3e60ce47c8dfcd83db633dc4214..adb48353f2e1a10f169df7c2cd4fc6d6f8e2c23a 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -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 */

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index 068aeaff7183b8227f0a27873af71213ac968e30..cfd2999acc594e81c5a1dbd806bfa681dd068bd3 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -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)