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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: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Felix Kuehling 2018-03-15 17:27:53 -04:00 committed by Oded Gabbay
parent 0fc8011f89
commit 374200b154
4 changed files with 19 additions and 0 deletions
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5
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -1151,6 +1151,11 @@ bool kfd_dev_is_large_bar(struct kfd_dev *dev)
{ {
struct kfd_local_mem_info mem_info; 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) if (dev->device_info->needs_iommu_device)
return false; return false;

3
drivers/gpu/drm/amd/amdkfd/kfd_crat.c
View File

@ -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 = (typeof(sub_type_hdr))((char *)sub_type_hdr +
sub_type_hdr->length); sub_type_hdr->length);
if (debug_largebar)
local_mem_info.local_mem_size_private = 0;
if (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, ret = kfd_fill_gpu_memory_affinity(&avail_size,
kdev, HSA_MEM_HEAP_TYPE_FB_PUBLIC, kdev, HSA_MEM_HEAP_TYPE_FB_PUBLIC,

5
drivers/gpu/drm/amd/amdkfd/kfd_module.c
View File

@ -71,6 +71,11 @@ module_param(send_sigterm, int, 0444);
MODULE_PARM_DESC(send_sigterm, MODULE_PARM_DESC(send_sigterm,
"Send sigterm to HSA process on unhandled exception (0 = disable, 1 = enable)"); "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; int ignore_crat;
module_param(ignore_crat, int, 0444); module_param(ignore_crat, int, 0444);
MODULE_PARM_DESC(ignore_crat, MODULE_PARM_DESC(ignore_crat,

6
drivers/gpu/drm/amd/amdkfd/kfd_priv.h
View File

@ -104,6 +104,12 @@ extern int cwsr_enable;
*/ */
extern int send_sigterm; 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 * Ignore CRAT table during KFD initialization, can be used to work around
* broken CRAT tables on some AMD systems * broken CRAT tables on some AMD systems