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Commit a16f8f11 authored by pding's avatar pding Committed by Alex Deucher
Browse files

drm/amdgpu/virt: add function to check MMIO (v2) 



MMIO space can be blocked on virtualised device. Add this
function to check if MMIO is blocked or not.

Todo: need a reliable method such like communation
with hypervisor.

v2:
 - add comments inline

Signed-off-by: default avatarpding <Pixel.Ding@amd.com>
Acked-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 1366b2d0

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

+8 −0
Original line number Diff line number Diff line
@@ -24,6 +24,14 @@ 
#include "amdgpu.h"

#define MAX_KIQ_REG_WAIT	100000000 /* in usecs */



bool amdgpu_virt_mmio_blocked(struct amdgpu_device *adev)

{

	/* By now all MMIO pages except mailbox are blocked */

	/* if blocking is enabled in hypervisor. Choose the */

	/* SCRATCH_REG0 to test. */

	return RREG32_NO_KIQ(0xc040) == 0xffffffff;

}



int amdgpu_allocate_static_csa(struct amdgpu_device *adev)

{

	int r;

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

+1 −0
Original line number Diff line number Diff line
@@ -276,6 +276,7 @@ static inline bool is_virtual_machine(void) 
}



struct amdgpu_vm;

bool amdgpu_virt_mmio_blocked(struct amdgpu_device *adev);

int amdgpu_allocate_static_csa(struct amdgpu_device *adev);

int amdgpu_map_static_csa(struct amdgpu_device *adev, struct amdgpu_vm *vm,

			  struct amdgpu_bo_va **bo_va);