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Commit 374200b1 authored by Felix Kuehling's avatar Felix Kuehling Committed by Oded Gabbay
Browse files

drm/amdkfd: Add module option for testing large-BAR functionality 



Simulate large-BAR system by exporting only visible memory. This
limits the amount of available VRAM to the size of the BAR, but
enables CPU access to VRAM.

Signed-off-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Acked-by: default avatarOded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: default avatarOded Gabbay <oded.gabbay@gmail.com>
parent 0fc8011f

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

+5 −0
Original line number Diff line number Diff line
@@ -1151,6 +1151,11 @@ bool kfd_dev_is_large_bar(struct kfd_dev *dev) 
{

	struct kfd_local_mem_info mem_info;



	if (debug_largebar) {

		pr_debug("Simulate large-bar allocation on non large-bar machine\n");

		return true;

	}



	if (dev->device_info->needs_iommu_device)

		return false;

drivers/gpu/drm/amd/amdkfd/kfd_crat.c

+3 −0
Original line number Diff line number Diff line
@@ -1117,6 +1117,9 @@ static int kfd_create_vcrat_image_gpu(void *pcrat_image, 
	sub_type_hdr = (typeof(sub_type_hdr))((char *)sub_type_hdr +

			sub_type_hdr->length);



	if (debug_largebar)

		local_mem_info.local_mem_size_private = 0;



	if (local_mem_info.local_mem_size_private == 0)

		ret = kfd_fill_gpu_memory_affinity(&avail_size,

				kdev, HSA_MEM_HEAP_TYPE_FB_PUBLIC,

drivers/gpu/drm/amd/amdkfd/kfd_module.c

+5 −0
Original line number Diff line number Diff line
@@ -71,6 +71,11 @@ module_param(send_sigterm, int, 0444); 
MODULE_PARM_DESC(send_sigterm,

	"Send sigterm to HSA process on unhandled exception (0 = disable, 1 = enable)");



int debug_largebar;

module_param(debug_largebar, int, 0444);

MODULE_PARM_DESC(debug_largebar,

	"Debug large-bar flag used to simulate large-bar capability on non-large bar machine (0 = disable, 1 = enable)");



int ignore_crat;

module_param(ignore_crat, int, 0444);

MODULE_PARM_DESC(ignore_crat,

drivers/gpu/drm/amd/amdkfd/kfd_priv.h

+6 −0
Original line number Diff line number Diff line
@@ -104,6 +104,12 @@ extern int cwsr_enable; 
 */

extern int send_sigterm;



/*

 * This kernel module is used to simulate large bar machine on non-large bar

 * enabled machines.

 */

extern int debug_largebar;



/*

 * Ignore CRAT table during KFD initialization, can be used to work around

 * broken CRAT tables on some AMD systems