drm/amdgpu: Destroy psp ring in hw_fini

Fix issue that PSP initialization will fail if reload amdgpu module.
That's because the PSP ring must be destroyed to be ready for the
next time PSP initialization.

Changes in v2:
	- Move psp_ring_destroy before all BOs free (suggested by
	  Ray Huang).
Changes in v3:
	- Check firmware load type, if it is not PSP, we should do
	  nothing in fw_fini(), and of course will not destroy
	  PSP ring too (suggested by Ray Huang).

Signed-off-by: Trigger Huang <trigger.huang@amd.com>
Reviewed-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -56,6 +56,7 @@ static int psp_sw_init(void *handle)
 		psp->prep_cmd_buf = psp_v3_1_prep_cmd_buf;
 		psp->ring_init = psp_v3_1_ring_init;
 		psp->ring_create = psp_v3_1_ring_create;
+		psp->ring_destroy = psp_v3_1_ring_destroy;
 		psp->cmd_submit = psp_v3_1_cmd_submit;
 		psp->compare_sram_data = psp_v3_1_compare_sram_data;
 		psp->smu_reload_quirk = psp_v3_1_smu_reload_quirk;
@@ -411,8 +412,12 @@ static int psp_hw_fini(void *handle)
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	struct psp_context *psp = &adev->psp;
 
-	if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP)
-		amdgpu_ucode_fini_bo(adev);
+	if (adev->firmware.load_type != AMDGPU_FW_LOAD_PSP)
+		return 0;
+
+	amdgpu_ucode_fini_bo(adev);
+
+	psp_ring_destroy(psp, PSP_RING_TYPE__KM);
 
 	if (psp->tmr_buf)
 		amdgpu_bo_free_kernel(&psp->tmr_bo, &psp->tmr_mc_addr, &psp->tmr_buf);

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

@@ -66,6 +66,8 @@ struct psp_context
 			    struct psp_gfx_cmd_resp *cmd);
 	int (*ring_init)(struct psp_context *psp, enum psp_ring_type ring_type);
 	int (*ring_create)(struct psp_context *psp, enum psp_ring_type ring_type);
+	int (*ring_destroy)(struct psp_context *psp,
+			    enum psp_ring_type ring_type);
 	int (*cmd_submit)(struct psp_context *psp, struct amdgpu_firmware_info *ucode,
 			  uint64_t cmd_buf_mc_addr, uint64_t fence_mc_addr, int index);
 	bool (*compare_sram_data)(struct psp_context *psp,
@@ -116,6 +118,7 @@ struct amdgpu_psp_funcs {
 #define psp_prep_cmd_buf(ucode, type) (psp)->prep_cmd_buf((ucode), (type))
 #define psp_ring_init(psp, type) (psp)->ring_init((psp), (type))
 #define psp_ring_create(psp, type) (psp)->ring_create((psp), (type))
+#define psp_ring_destroy(psp, type) ((psp)->ring_destroy((psp), (type)))
 #define psp_cmd_submit(psp, ucode, cmd_mc, fence_mc, index) \
 		(psp)->cmd_submit((psp), (ucode), (cmd_mc), (fence_mc), (index))
 #define psp_compare_sram_data(psp, ucode, type) \

drivers/gpu/drm/amd/amdgpu/psp_v3_1.c

@@ -321,6 +321,33 @@ int psp_v3_1_ring_create(struct psp_context *psp, enum psp_ring_type ring_type)
 	return ret;
 }
 
+int psp_v3_1_ring_destroy(struct psp_context *psp, enum psp_ring_type ring_type)
+{
+	int ret = 0;
+	struct psp_ring *ring;
+	unsigned int psp_ring_reg = 0;
+	struct amdgpu_device *adev = psp->adev;
+
+	ring = &psp->km_ring;
+
+	/* Write the ring destroy command to C2PMSG_64 */
+	psp_ring_reg = 3 << 16;
+	WREG32(SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_64), psp_ring_reg);
+
+	/* there might be handshake issue with hardware which needs delay */
+	mdelay(20);
+
+	/* Wait for response flag (bit 31) in C2PMSG_64 */
+	ret = psp_wait_for(psp, SOC15_REG_OFFSET(MP0, 0, mmMP0_SMN_C2PMSG_64),
+			   0x80000000, 0x80000000, false);
+
+	if (ring->ring_mem)
+		amdgpu_bo_free_kernel(&adev->firmware.rbuf,
+				      &ring->ring_mem_mc_addr,
+				      (void **)&ring->ring_mem);
+	return ret;
+}
+
 int psp_v3_1_cmd_submit(struct psp_context *psp,
 		        struct amdgpu_firmware_info *ucode,
 		        uint64_t cmd_buf_mc_addr, uint64_t fence_mc_addr,

drivers/gpu/drm/amd/amdgpu/psp_v3_1.h

@@ -41,6 +41,8 @@ extern int psp_v3_1_ring_init(struct psp_context *psp,
 			      enum psp_ring_type ring_type);
 extern int psp_v3_1_ring_create(struct psp_context *psp,
 				enum psp_ring_type ring_type);
+extern int psp_v3_1_ring_destroy(struct psp_context *psp,
+				enum psp_ring_type ring_type);
 extern int psp_v3_1_cmd_submit(struct psp_context *psp,
 			       struct amdgpu_firmware_info *ucode,
 			       uint64_t cmd_buf_mc_addr, uint64_t fence_mc_addr,