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Date: Tue, 7 Jun 2022 19:01:18 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Chia-I Wu <olvaffe@...il.com>,
Rob Clark <robdclark@...omium.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 486/772] drm/msm: simplify gpu_busy callback
From: Chia-I Wu <olvaffe@...il.com>
[ Upstream commit 15c411980bacddf294452fd1cf7308b14f3f8c63 ]
Move tracking and busy time calculation to msm_devfreq_get_dev_status.
Signed-off-by: Chia-I Wu <olvaffe@...il.com>
Cc: Rob Clark <robdclark@...omium.org>
Link: https://lore.kernel.org/r/20220416003314.59211-2-olvaffe@gmail.com
Signed-off-by: Rob Clark <robdclark@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 19 ++++++----------
drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 15 +++++--------
drivers/gpu/drm/msm/msm_gpu.h | 9 +++-----
drivers/gpu/drm/msm/msm_gpu_devfreq.c | 32 ++++++++++++++++++++++-----
4 files changed, 41 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 3d28fcf841a6..1e5de1477968 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1662,28 +1662,23 @@ static struct msm_ringbuffer *a5xx_active_ring(struct msm_gpu *gpu)
return a5xx_gpu->cur_ring;
}
-static unsigned long a5xx_gpu_busy(struct msm_gpu *gpu)
+static u64 a5xx_gpu_busy(struct msm_gpu *gpu, unsigned long *out_sample_rate)
{
- u64 busy_cycles, busy_time;
+ u64 busy_cycles;
/* Only read the gpu busy if the hardware is already active */
- if (pm_runtime_get_if_in_use(&gpu->pdev->dev) == 0)
+ if (pm_runtime_get_if_in_use(&gpu->pdev->dev) == 0) {
+ *out_sample_rate = 1;
return 0;
+ }
busy_cycles = gpu_read64(gpu, REG_A5XX_RBBM_PERFCTR_RBBM_0_LO,
REG_A5XX_RBBM_PERFCTR_RBBM_0_HI);
-
- busy_time = busy_cycles - gpu->devfreq.busy_cycles;
- do_div(busy_time, clk_get_rate(gpu->core_clk) / 1000000);
-
- gpu->devfreq.busy_cycles = busy_cycles;
+ *out_sample_rate = clk_get_rate(gpu->core_clk);
pm_runtime_put(&gpu->pdev->dev);
- if (WARN_ON(busy_time > ~0LU))
- return ~0LU;
-
- return (unsigned long)busy_time;
+ return busy_cycles;
}
static uint32_t a5xx_get_rptr(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 147e716108ba..55eb0054cd3a 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1621,12 +1621,14 @@ static void a6xx_destroy(struct msm_gpu *gpu)
kfree(a6xx_gpu);
}
-static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
+static u64 a6xx_gpu_busy(struct msm_gpu *gpu, unsigned long *out_sample_rate)
{
struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
- u64 busy_cycles, busy_time;
+ u64 busy_cycles;
+ /* 19.2MHz */
+ *out_sample_rate = 19200000;
/* Only read the gpu busy if the hardware is already active */
if (pm_runtime_get_if_in_use(a6xx_gpu->gmu.dev) == 0)
@@ -1636,17 +1638,10 @@ static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
REG_A6XX_GMU_CX_GMU_POWER_COUNTER_XOCLK_0_L,
REG_A6XX_GMU_CX_GMU_POWER_COUNTER_XOCLK_0_H);
- busy_time = (busy_cycles - gpu->devfreq.busy_cycles) * 10;
- do_div(busy_time, 192);
-
- gpu->devfreq.busy_cycles = busy_cycles;
pm_runtime_put(a6xx_gpu->gmu.dev);
- if (WARN_ON(busy_time > ~0LU))
- return ~0LU;
-
- return (unsigned long)busy_time;
+ return busy_cycles;
}
static void a6xx_gpu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp)
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 92aa1e9196c6..a88ec0fc6d87 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -59,7 +59,7 @@ struct msm_gpu_funcs {
/* for generation specific debugfs: */
void (*debugfs_init)(struct msm_gpu *gpu, struct drm_minor *minor);
#endif
- unsigned long (*gpu_busy)(struct msm_gpu *gpu);
+ u64 (*gpu_busy)(struct msm_gpu *gpu, unsigned long *out_sample_rate);
struct msm_gpu_state *(*gpu_state_get)(struct msm_gpu *gpu);
int (*gpu_state_put)(struct msm_gpu_state *state);
unsigned long (*gpu_get_freq)(struct msm_gpu *gpu);
@@ -103,11 +103,8 @@ struct msm_gpu_devfreq {
struct dev_pm_qos_request boost_freq;
/**
- * busy_cycles:
- *
- * Used by implementation of gpu->gpu_busy() to track the last
- * busy counter value, for calculating elapsed busy cycles since
- * last sampling period.
+ * busy_cycles: Last busy counter value, for calculating elapsed busy
+ * cycles since last sampling period.
*/
u64 busy_cycles;
diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index 12641616acd3..d2b4c646a0ae 100644
--- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
+++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
@@ -49,18 +49,38 @@ static unsigned long get_freq(struct msm_gpu *gpu)
return clk_get_rate(gpu->core_clk);
}
-static int msm_devfreq_get_dev_status(struct device *dev,
+static void get_raw_dev_status(struct msm_gpu *gpu,
struct devfreq_dev_status *status)
{
- struct msm_gpu *gpu = dev_to_gpu(dev);
+ struct msm_gpu_devfreq *df = &gpu->devfreq;
+ u64 busy_cycles, busy_time;
+ unsigned long sample_rate;
ktime_t time;
status->current_frequency = get_freq(gpu);
- status->busy_time = gpu->funcs->gpu_busy(gpu);
-
+ busy_cycles = gpu->funcs->gpu_busy(gpu, &sample_rate);
time = ktime_get();
- status->total_time = ktime_us_delta(time, gpu->devfreq.time);
- gpu->devfreq.time = time;
+
+ busy_time = busy_cycles - df->busy_cycles;
+ status->total_time = ktime_us_delta(time, df->time);
+
+ df->busy_cycles = busy_cycles;
+ df->time = time;
+
+ busy_time *= USEC_PER_SEC;
+ do_div(busy_time, sample_rate);
+ if (WARN_ON(busy_time > ~0LU))
+ busy_time = ~0LU;
+
+ status->busy_time = busy_time;
+}
+
+static int msm_devfreq_get_dev_status(struct device *dev,
+ struct devfreq_dev_status *status)
+{
+ struct msm_gpu *gpu = dev_to_gpu(dev);
+
+ get_raw_dev_status(gpu, status);
return 0;
}
--
2.35.1
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