drm/radeon: add get_allowed_info_register for EG/BTC

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/evergreen.c

@@ -1006,6 +1006,34 @@ static void evergreen_init_golden_registers(struct radeon_device *rdev)
 	}
 }
 
+/**
+ * evergreen_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 evergreen_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:
+	case UVD_STATUS:
+		*val = RREG32(reg);
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
 void evergreen_tiling_fields(unsigned tiling_flags, unsigned *bankw,
 			     unsigned *bankh, unsigned *mtaspect,
 			     unsigned *tile_split)

drivers/gpu/drm/radeon/evergreend.h

@@ -1520,6 +1520,7 @@
 #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

@@ -1344,6 +1344,7 @@ static struct radeon_asic evergreen_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 = evergreen_get_allowed_info_register,
 	.gart = {
 		.tlb_flush = &evergreen_pcie_gart_tlb_flush,
 		.get_page_entry = &rs600_gart_get_page_entry,
@@ -1437,6 +1438,7 @@ static struct radeon_asic sumo_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 = evergreen_get_allowed_info_register,
 	.gart = {
 		.tlb_flush = &evergreen_pcie_gart_tlb_flush,
 		.get_page_entry = &rs600_gart_get_page_entry,
@@ -1529,6 +1531,7 @@ static struct radeon_asic btc_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 = evergreen_get_allowed_info_register,
 	.gart = {
 		.tlb_flush = &evergreen_pcie_gart_tlb_flush,
 		.get_page_entry = &rs600_gart_get_page_entry,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -548,6 +548,8 @@ struct radeon_fence *evergreen_copy_dma(struct radeon_device *rdev,
 					unsigned num_gpu_pages,
 					struct reservation_object *resv);
 int evergreen_get_temp(struct radeon_device *rdev);
+int evergreen_get_allowed_info_register(struct radeon_device *rdev,
+					u32 reg, u32 *val);
 int sumo_get_temp(struct radeon_device *rdev);
 int tn_get_temp(struct radeon_device *rdev);
 int cypress_dpm_init(struct radeon_device *rdev);