Revert "Workaround for non cached memory issue on gfx801 A0"

This reverts commit b494094790.

Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Acked-by: Ben Goz <ben.goz@amd.com>

Conflicts:
	include/linux/kfd_ioctl.h
	src/queues.c


[ROCm/ROCR-Runtime commit: 5c0f8660b6]

projects/rocr-runtime/include/linux/kfd_ioctl.h

@@ -313,13 +313,7 @@ struct kfd_ioctl_open_graphic_handle_args {
 #define AMDKFD_IOC_OPEN_GRAPHIC_HANDLE		\
 		AMDKFD_IOWR(0x13, struct kfd_ioctl_open_graphic_handle_args)
 
-#define AMDKFD_IOC_NC_PAGE_ALLOC		\
-		AMDKFD_IOWR(0x14, unsigned long)
-
-#define AMDKFD_IOC_NC_PAGE_FREE			\
-		AMDKFD_IOWR(0x15, unsigned long)
-
 #define AMDKFD_COMMAND_START			0x01
-#define AMDKFD_COMMAND_END			0x16
+#define AMDKFD_COMMAND_END			0x14
 
 #endif

projects/rocr-runtime/src/queues.c

@@ -94,7 +94,7 @@ struct queue
 {
 	uint32_t queue_id;
 	uint32_t wptr;
-	uint32_t *rptr;
+	uint32_t rptr;
 	void *eop_buffer;
 	void *ctx_save_restore;
 };
@@ -108,29 +108,6 @@ struct process_doorbells
 
 struct process_doorbells doorbells[] = {[0 ... (NUM_OF_SUPPORTED_GPUS-1)] = {.need_mmap = true, .doorbells = NULL, .doorbells_mutex = PTHREAD_MUTEX_INITIALIZER}};
 
-static uint32_t *nc_rptr_page = NULL;
-
-static void* alloc_nc_page(void)
-{
-	void *ptr;
-	if (nc_rptr_page)
-		return nc_rptr_page;
-
-	if (kmtIoctl(kfd_fd, AMDKFD_IOC_NC_PAGE_ALLOC, &ptr) == 0) {
-		nc_rptr_page = ptr;
-		return ptr;
-	}
-	return NULL;
-
-}
-
-static void free_nc_page(void **page_addr)
-{
-	if (*page_addr)
-		if (kmtIoctl(kfd_fd, AMDKFD_IOC_NC_PAGE_FREE, *page_addr) == 0)
-				*page_addr = NULL;
-}
-
 static struct device_info *get_device_info_by_dev_id(uint16_t dev_id)
 {
 	int i = 0;
@@ -250,18 +227,10 @@ hsaKmtCreateQueue(
 	default: free_queue(q); return HSAKMT_STATUS_INVALID_PARAMETER;
 	}
 
-	if (Type != HSA_QUEUE_COMPUTE_AQL) {
+	if (Type != HSA_QUEUE_COMPUTE_AQL)
+	{
 		QueueResource->QueueRptrValue = (uintptr_t)&q->rptr;
 		QueueResource->QueueWptrValue = (uintptr_t)&q->wptr;
-
-		/* CZ A0 workaround */
-		if (dev_info->eop_buffer_size > 0) {
-			if (alloc_nc_page() == NULL) {
-				free_queue(q);
-				return HSAKMT_STATUS_NO_MEMORY;
-			}
-			QueueResource->Queue_read_ptr = (HSAuint32 *)nc_rptr_page;
-		}
 	}
 
 	args.read_pointer_address = QueueResource->QueueRptrValue;
@@ -280,13 +249,6 @@ hsaKmtCreateQueue(
 	}
 
 	q->queue_id = args.queue_id;
-	if (Type != HSA_QUEUE_COMPUTE_AQL &&
-			dev_info->eop_buffer_size > 0)
-	{
-		q->rptr = &nc_rptr_page[args.queue_id];
-		QueueResource->Queue_read_ptr = (HSAuint32 *)&nc_rptr_page[args.queue_id];
-		*q->rptr = 0;
-	}
 
 	pthread_mutex_lock(&doorbells[NodeId].doorbells_mutex);
 
@@ -373,9 +335,6 @@ hsaKmtDestroyQueue(
 	}
 	else
 	{
-		if (nc_rptr_page != NULL)
-			free_nc_page((void **)&nc_rptr_page);
-
 		free_queue(q);
 		return HSAKMT_STATUS_SUCCESS;
 	}