drm/amdgpu/gfx9: switch to golden tsc registers for renoir+

Renoir and newer gfx9 APUs have new TSC register that is
not part of the gfxoff tile, so it can be read without
needing to disable gfx off.

Acked-by: Luben Tuikov <luben.tuikov@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index b4b80f2..34478bc 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -140,6 +140,11 @@ MODULE_FIRMWARE("amdgpu/aldebaran_rlc.bin");
 #define mmTCP_CHAN_STEER_5_ARCT                                                                0x0b0c
 #define mmTCP_CHAN_STEER_5_ARCT_BASE_IDX                                                       0
 
+#define mmGOLDEN_TSC_COUNT_UPPER_Renoir                0x0025
+#define mmGOLDEN_TSC_COUNT_UPPER_Renoir_BASE_IDX       1
+#define mmGOLDEN_TSC_COUNT_LOWER_Renoir                0x0026
+#define mmGOLDEN_TSC_COUNT_LOWER_Renoir_BASE_IDX       1
+
 enum ta_ras_gfx_subblock {
        /*CPC*/
        TA_RAS_BLOCK__GFX_CPC_INDEX_START = 0,
@@ -4238,19 +4243,38 @@ failed_kiq_read:
 
 static uint64_t gfx_v9_0_get_gpu_clock_counter(struct amdgpu_device *adev)
 {
-       uint64_t clock;
+       uint64_t clock, clock_lo, clock_hi, hi_check;
 
-       amdgpu_gfx_off_ctrl(adev, false);
-       mutex_lock(&adev->gfx.gpu_clock_mutex);
-       if (adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 0, 1) && amdgpu_sriov_runtime(adev)) {
-               clock = gfx_v9_0_kiq_read_clock(adev);
-       } else {
-               WREG32_SOC15(GC, 0, mmRLC_CAPTURE_GPU_CLOCK_COUNT, 1);
-               clock = (uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_LSB) |
-                       ((uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_MSB) << 32ULL);
+       switch (adev->ip_versions[GC_HWIP][0]) {
+       case IP_VERSION(9, 3, 0):
+               preempt_disable();
+               clock_hi = RREG32_SOC15_NO_KIQ(SMUIO, 0, mmGOLDEN_TSC_COUNT_UPPER_Renoir);
+               clock_lo = RREG32_SOC15_NO_KIQ(SMUIO, 0, mmGOLDEN_TSC_COUNT_LOWER_Renoir);
+               hi_check = RREG32_SOC15_NO_KIQ(SMUIO, 0, mmGOLDEN_TSC_COUNT_UPPER_Renoir);
+               /* The SMUIO TSC clock frequency is 100MHz, which sets 32-bit carry over
+                * roughly every 42 seconds.
+                */
+               if (hi_check != clock_hi) {
+                       clock_lo = RREG32_SOC15_NO_KIQ(SMUIO, 0, mmGOLDEN_TSC_COUNT_LOWER_Renoir);
+                       clock_hi = hi_check;
+               }
+               preempt_enable();
+               clock = clock_lo | (clock_hi << 32ULL);
+               break;
+       default:
+               amdgpu_gfx_off_ctrl(adev, false);
+               mutex_lock(&adev->gfx.gpu_clock_mutex);
+               if (adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 0, 1) && amdgpu_sriov_runtime(adev)) {
+                       clock = gfx_v9_0_kiq_read_clock(adev);
+               } else {
+                       WREG32_SOC15(GC, 0, mmRLC_CAPTURE_GPU_CLOCK_COUNT, 1);
+                       clock = (uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_LSB) |
+                               ((uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_MSB) << 32ULL);
+               }
+               mutex_unlock(&adev->gfx.gpu_clock_mutex);
+               amdgpu_gfx_off_ctrl(adev, true);
+               break;
        }
-       mutex_unlock(&adev->gfx.gpu_clock_mutex);
-       amdgpu_gfx_off_ctrl(adev, true);
        return clock;
 }