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

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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: pding <Pixel.Ding@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
pding 2017-10-24 10:01:13 +08:00 • committed by Alex Deucher
parent 1366b2d016
commit a16f8f11c5
2 changed files with 9 additions and 0 deletions
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8
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
View file

@ -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;

1
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
View file

@ -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);