Re: [PATCH 2/5] drm/msm/a2xx: Implement .gpu_busy

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On 22/02/2023 23:47, Konrad Dybcio wrote:
Implement gpu_busy based on the downstream msm-3.4 code [1]. This
allows us to use devfreq on this old old old hardware!

[1] https://github.com/LineageOS/android_kernel_sony_apq8064/blob/lineage-16.0/drivers/gpu/msm/adreno_a2xx.c#L1975

Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
---
  drivers/gpu/drm/msm/adreno/a2xx_gpu.c | 28 ++++++++++++++++++++++++++++
  1 file changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c
index c67089a7ebc1..6258c98e5a88 100644
--- a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c
@@ -481,6 +481,33 @@ a2xx_create_address_space(struct msm_gpu *gpu, struct platform_device *pdev)
  	return aspace;
  }
+/* While the precise size of this field is unknown, it holds at least these three values.. */
+#define PERF_MODE_CNT		GENMASK(2, 0)
+ #define PERF_STATE_RESET	0x0
+ #define PERF_STATE_ENABLE	0x1
+ #define PERF_STATE_FREEZE	0x2

These should go into a2xx.xml.h

LGTM otherwise.

+static u64 a2xx_gpu_busy(struct msm_gpu *gpu, unsigned long *out_sample_rate)
+{
+	u64 busy_cycles;
+
+	/* Freeze the counter */
+	gpu_write(gpu, REG_A2XX_CP_PERFMON_CNTL, FIELD_PREP(PERF_MODE_CNT, PERF_STATE_FREEZE));
+
+	busy_cycles = gpu_read64(gpu, REG_A2XX_RBBM_PERFCOUNTER1_LO);
+
+	/* Reset the counter */
+	gpu_write(gpu, REG_A2XX_CP_PERFMON_CNTL, FIELD_PREP(PERF_MODE_CNT, PERF_STATE_RESET));
+
+	/* Re-enable the performance monitors */
+	gpu_rmw(gpu, REG_A2XX_RBBM_PM_OVERRIDE2, BIT(6), BIT(6));
+	gpu_write(gpu, REG_A2XX_RBBM_PERFCOUNTER1_SELECT, 1);
+	gpu_write(gpu, REG_A2XX_CP_PERFMON_CNTL, FIELD_PREP(PERF_MODE_CNT, PERF_STATE_ENABLE));
+
+	*out_sample_rate = clk_get_rate(gpu->core_clk);
+
+	return busy_cycles;
+}
+
  static u32 a2xx_get_rptr(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
  {
  	ring->memptrs->rptr = gpu_read(gpu, REG_AXXX_CP_RB_RPTR);
@@ -502,6 +529,7 @@ static const struct adreno_gpu_funcs funcs = {
  #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
  		.show = adreno_show,
  #endif
+		.gpu_busy = a2xx_gpu_busy,
  		.gpu_state_get = a2xx_gpu_state_get,
  		.gpu_state_put = adreno_gpu_state_put,
  		.create_address_space = a2xx_create_address_space,


--
With best wishes
Dmitry




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