drm/amdgpu: add amdgpu.sched_jobs option

This option can be used to specify the max job number in the job queue,
and it is 16 by default.

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -80,6 +80,7 @@ extern int amdgpu_deep_color;
 extern int amdgpu_vm_size;
 extern int amdgpu_vm_block_size;
 extern int amdgpu_enable_scheduler;
+extern int amdgpu_sched_jobs;
 
 #define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS	        3000
 #define AMDGPU_MAX_USEC_TIMEOUT			100000	/* 100 ms */

drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c

@@ -105,7 +105,8 @@ int amdgpu_ctx_alloc(struct amdgpu_device *adev, struct amdgpu_fpriv *fpriv,
 				rq = &adev->rings[i]->scheduler->kernel_rq;
 			r = amd_context_entity_init(adev->rings[i]->scheduler,
 						    &ctx->rings[i].c_entity,
-						    NULL, rq, *id);
+						    NULL, rq, *id,
+						    amdgpu_sched_jobs);
 			if (r)
 				break;
 		}

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -76,6 +76,7 @@ int amdgpu_vm_size = 8;
 int amdgpu_vm_block_size = -1;
 int amdgpu_exp_hw_support = 0;
 int amdgpu_enable_scheduler = 0;
+int amdgpu_sched_jobs = 16;
 
 MODULE_PARM_DESC(vramlimit, "Restrict VRAM for testing, in megabytes");
 module_param_named(vramlimit, amdgpu_vram_limit, int, 0600);
@@ -143,6 +144,9 @@ module_param_named(exp_hw_support, amdgpu_exp_hw_support, int, 0444);
 MODULE_PARM_DESC(enable_scheduler, "enable SW GPU scheduler (1 = enable, 0 = disable ((default))");
 module_param_named(enable_scheduler, amdgpu_enable_scheduler, int, 0444);
 
+MODULE_PARM_DESC(sched_jobs, "the max number of jobs supported in the sw queue (default 16)");
+module_param_named(sched_jobs, amdgpu_sched_jobs, int, 0444);
+
 static struct pci_device_id pciidlist[] = {
 #ifdef CONFIG_DRM_AMDGPU_CIK
 	/* Kaveri */

drivers/gpu/drm/amd/scheduler/gpu_scheduler.c

@@ -173,6 +173,7 @@ exit:
  * @parent	The parent entity of this amd_context_entity
  * @rq		The run queue this entity belongs
  * @context_id	The context id for this entity
+ * @jobs	The max number of jobs in the job queue
  *
  * return 0 if succeed. negative error code on failure
 */
@@ -180,7 +181,8 @@ int amd_context_entity_init(struct amd_gpu_scheduler *sched,
 			    struct amd_context_entity *entity,
 			    struct amd_sched_entity *parent,
 			    struct amd_run_queue *rq,
-			    uint32_t context_id)
+			    uint32_t context_id,
+			    uint32_t jobs)
 {
 	uint64_t seq_ring = 0;
 
@@ -196,7 +198,7 @@ int amd_context_entity_init(struct amd_gpu_scheduler *sched,
 	init_waitqueue_head(&entity->wait_queue);
 	init_waitqueue_head(&entity->wait_emit);
 	if(kfifo_alloc(&entity->job_queue,
-		       AMD_MAX_JOB_ENTRY_PER_CONTEXT * sizeof(void *),
+		       jobs * sizeof(void *),
 		       GFP_KERNEL))
 		return -EINVAL;
 

drivers/gpu/drm/amd/scheduler/gpu_scheduler.h

@@ -27,7 +27,6 @@
 #include <linux/kfifo.h>
 
 #define AMD_MAX_ACTIVE_HW_SUBMISSION		2
-#define AMD_MAX_JOB_ENTRY_PER_CONTEXT		16
 
 #define AMD_KERNEL_CONTEXT_ID			0
 #define AMD_KERNEL_PROCESS_ID			0
@@ -155,6 +154,7 @@ int amd_context_entity_init(struct amd_gpu_scheduler *sched,
 			    struct amd_context_entity *entity,
 			    struct amd_sched_entity *parent,
 			    struct amd_run_queue *rq,
-			    uint32_t context_id);
+			    uint32_t context_id,
+			    uint32_t jobs);
 
 #endif