drm/radeon: add get_allowed_info_register for cayman/TN

Registers that can be fetched from the info ioctl.
Tested-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ni.c

@@ -828,6 +828,35 @@ int ni_init_microcode(struct radeon_device *rdev)
 	return err;
 }
 
+/**
+ * cayman_get_allowed_info_register - fetch the register for the info ioctl
+ *
+ * @rdev: radeon_device pointer
+ * @reg: register offset in bytes
+ * @val: register value
+ *
+ * Returns 0 for success or -EINVAL for an invalid register
+ *
+ */
+int cayman_get_allowed_info_register(struct radeon_device *rdev,
+				     u32 reg, u32 *val)
+{
+	switch (reg) {
+	case GRBM_STATUS:
+	case GRBM_STATUS_SE0:
+	case GRBM_STATUS_SE1:
+	case SRBM_STATUS:
+	case SRBM_STATUS2:
+	case (DMA_STATUS_REG + DMA0_REGISTER_OFFSET):
+	case (DMA_STATUS_REG + DMA1_REGISTER_OFFSET):
+	case UVD_STATUS:
+		*val = RREG32(reg);
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
 int tn_get_temp(struct radeon_device *rdev)
 {
 	u32 temp = RREG32_SMC(TN_CURRENT_GNB_TEMP) & 0x7ff;

drivers/gpu/drm/radeon/nid.h

@@ -1086,6 +1086,7 @@
 #define UVD_UDEC_DBW_ADDR_CONFIG			0xEF54
 #define UVD_RBC_RB_RPTR					0xF690
 #define UVD_RBC_RB_WPTR					0xF694
+#define UVD_STATUS					0xf6bc
 
 /*
  * PM4

drivers/gpu/drm/radeon/radeon_asic.c

@@ -1668,6 +1668,7 @@ static struct radeon_asic cayman_asic = {
 	.mc_wait_for_idle = &evergreen_mc_wait_for_idle,
 	.get_xclk = &rv770_get_xclk,
 	.get_gpu_clock_counter = &r600_get_gpu_clock_counter,
+	.get_allowed_info_register = cayman_get_allowed_info_register,
 	.gart = {
 		.tlb_flush = &cayman_pcie_gart_tlb_flush,
 		.get_page_entry = &rs600_gart_get_page_entry,
@@ -1772,6 +1773,7 @@ static struct radeon_asic trinity_asic = {
 	.mc_wait_for_idle = &evergreen_mc_wait_for_idle,
 	.get_xclk = &r600_get_xclk,
 	.get_gpu_clock_counter = &r600_get_gpu_clock_counter,
+	.get_allowed_info_register = cayman_get_allowed_info_register,
 	.gart = {
 		.tlb_flush = &cayman_pcie_gart_tlb_flush,
 		.get_page_entry = &rs600_gart_get_page_entry,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -651,6 +651,8 @@ uint32_t cayman_dma_get_wptr(struct radeon_device *rdev,
 			     struct radeon_ring *ring);
 void cayman_dma_set_wptr(struct radeon_device *rdev,
 			 struct radeon_ring *ring);
+int cayman_get_allowed_info_register(struct radeon_device *rdev,
+				     u32 reg, u32 *val);
 
 int ni_dpm_init(struct radeon_device *rdev);
 void ni_dpm_setup_asic(struct radeon_device *rdev);