drm/amdgpu/virt: add high level interfaces for virt

Add high level interfaces that is not relate to specific asic. So
asic files just need to implement the interfaces to support
virtualization.

Signed-off-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 85 insertions, 5 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index 00583baab132..6e63e7f3025c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -149,3 +149,70 @@ void amdgpu_virt_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
                 DRM_ERROR("wait for kiq fence error: %ld.\n", r);
         dma_fence_put(f);
 }
+
+/**
+ * amdgpu_virt_request_full_gpu() - request full gpu access
+ * @amdgpu:     amdgpu device.
+ * @init:       is driver init time.
+ * When start to init/fini driver, first need to request full gpu access.
+ * Return: Zero if request success, otherwise will return error.
+ */
+int amdgpu_virt_request_full_gpu(struct amdgpu_device *adev, bool init)
+{
+        struct amdgpu_virt *virt = &adev->virt;
+        int r;
+
+        if (virt->ops && virt->ops->req_full_gpu) {
+                r = virt->ops->req_full_gpu(adev, init);
+                if (r)
+                        return r;
+
+                adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
+        }
+
+        return 0;
+}
+
+/**
+ * amdgpu_virt_release_full_gpu() - release full gpu access
+ * @amdgpu:     amdgpu device.
+ * @init:       is driver init time.
+ * When finishing driver init/fini, need to release full gpu access.
+ * Return: Zero if release success, otherwise will returen error.
+ */
+int amdgpu_virt_release_full_gpu(struct amdgpu_device *adev, bool init)
+{
+        struct amdgpu_virt *virt = &adev->virt;
+        int r;
+
+        if (virt->ops && virt->ops->rel_full_gpu) {
+                r = virt->ops->rel_full_gpu(adev, init);
+                if (r)
+                        return r;
+
+                adev->virt.caps |= AMDGPU_SRIOV_CAPS_RUNTIME;
+        }
+        return 0;
+}
+
+/**
+ * amdgpu_virt_reset_gpu() - reset gpu
+ * @amdgpu:     amdgpu device.
+ * Send reset command to GPU hypervisor to reset GPU that VM is using
+ * Return: Zero if reset success, otherwise will return error.
+ */
+int amdgpu_virt_reset_gpu(struct amdgpu_device *adev)
+{
+        struct amdgpu_virt *virt = &adev->virt;
+        int r;
+
+        if (virt->ops && virt->ops->reset_gpu) {
+                r = virt->ops->reset_gpu(adev);
+                if (r)
+                        return r;
+
+                adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
+        }
+
+        return 0;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
index 433f559bc4a1..d4605442026e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -30,13 +30,23 @@
 #define AMDGPU_PASSTHROUGH_MODE        (1 << 3) /* thw whole GPU is pass through for VM */
 #define AMDGPU_SRIOV_CAPS_RUNTIME      (1 << 4) /* is out of full access mode */
 
+/**
+ * struct amdgpu_virt_ops - amdgpu device virt operations
+ */
+struct amdgpu_virt_ops {
+        int (*req_full_gpu)(struct amdgpu_device *adev, bool init);
+        int (*rel_full_gpu)(struct amdgpu_device *adev, bool init);
+        int (*reset_gpu)(struct amdgpu_device *adev);
+};
+
 /* GPU virtualization */
 struct amdgpu_virt {
-        uint32_t caps;
-        struct amdgpu_bo *csa_obj;
-        uint64_t csa_vmid0_addr;
-        uint32_t                reg_val_offs;
-        struct mutex            lock;
+        uint32_t                        caps;
+        struct amdgpu_bo                *csa_obj;
+        uint64_t                        csa_vmid0_addr;
+        uint32_t                        reg_val_offs;
+        struct mutex                    lock;
+        const struct amdgpu_virt_ops    *ops;
 };
 
 #define AMDGPU_CSA_SIZE    (8 * 1024)
@@ -72,5 +82,8 @@ int amdgpu_map_static_csa(struct amdgpu_device *adev, struct amdgpu_vm *vm);
 void amdgpu_virt_init_setting(struct amdgpu_device *adev);
 uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg);
 void amdgpu_virt_kiq_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v);
+int amdgpu_virt_request_full_gpu(struct amdgpu_device *adev, bool init);
+int amdgpu_virt_release_full_gpu(struct amdgpu_device *adev, bool init);
+int amdgpu_virt_reset_gpu(struct amdgpu_device *adev);
 
 #endif