From: pding <Pixel.Ding@amd.com>
Date: Tue, 24 Oct 2017 10:01:13 +0800
Subject: drm/amdgpu/virt: add function to check MMIO (v2)
Git-commit: a16f8f11c599cdec16e77020d56d230fedabe922
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 8 ++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h | 1 +
2 files changed, 9 insertions(+)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -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;
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -276,6 +276,7 @@ static inline bool is_virtual_machine(vo
}
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);