[PATCH v2 0/5] msm/drm: A6xx DCVS series

[PATCH v2 0/5] msm/drm: A6xx DCVS series

[Sharat Masetty]

This patch series starts off with a few bug fixes in devfreq code, followed by
refactoring the devfreq code needed for supporting different chipsets, and
ends with adding devfreq support for A6xx.

Sharat Masetty (5):
  drm/msm: suspend devfreq on init
  drm/msm: unregister devfreq upon clean up
  drm/msm/A6xx: Add gmu_read64() register read op
  drm/msm: re-factor devfreq code
  drm/msm/A6xx: Add devfreq support for A6xx

 drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 16 ++++++++---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 39 +++++++++++++++++++++++---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 12 ++++++++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 27 ++++++++++++++++++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  2 ++
 drivers/gpu/drm/msm/msm_gpu.c         | 53 +++++++++++++++++++++--------------
 drivers/gpu/drm/msm/msm_gpu.h         |  5 +++-
 7 files changed, 124 insertions(+), 30 deletions(-)

--
1.9.1

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[PATCH v2 1/5] drm/msm: suspend devfreq on init

[Sharat Masetty]

Devfreq turns on and starts recommending power level as soon as it is
initialized. The GPU is still not powered on by the time the devfreq
init happens and this leads to problems on GPU's where register access
is needed to get/set power levels. So we start suspended and only restart
devfreq when GPU is powered on.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 5281a32..04f9604 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -104,6 +104,8 @@ static void msm_devfreq_init(struct msm_gpu *gpu)
 		dev_err(&gpu->pdev->dev, "Couldn't initialize GPU devfreq\n");
 		gpu->devfreq.devfreq = NULL;
 	}
+
+	devfreq_suspend_device(gpu->devfreq.devfreq);
 }
 
 static int enable_pwrrail(struct msm_gpu *gpu)
-- 
1.9.1

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[PATCH v2 2/5] drm/msm: unregister devfreq upon clean up

[Sharat Masetty]

Call the devfreq_remove_device() API to remove the GPU devfreq instance
during GPU driver cleanup.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 04f9604..8d6bc0c 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -970,6 +970,8 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
 
 	WARN_ON(!list_empty(&gpu->active_list));
 
+	devm_devfreq_remove_device(&gpu->pdev->dev, gpu->devfreq.devfreq);
+
 	for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
 		msm_ringbuffer_destroy(gpu->rb[i]);
 		gpu->rb[i] = NULL;
-- 
1.9.1

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[PATCH v2 3/5] drm/msm/A6xx: Add gmu_read64() register read op

[Sharat Masetty]

Add a simple function to read 64 registers in the GMU domain

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
index a08ee8f..09fd3a7 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
@@ -106,6 +106,16 @@ static inline void gmu_rmw(struct a6xx_gmu *gmu, u32 reg, u32 mask, u32 or)
 	gmu_write(gmu, reg, val | or);
 }
 
+static inline u64 gmu_read64(struct a6xx_gmu *gmu, u32 lo, u32 hi)
+{
+	u64 val;
+
+	val = (u64) msm_readl(gmu->mmio + (lo << 2));
+	val |= ((u64) msm_readl(gmu->mmio + (hi << 2)) << 32);
+
+	return val;
+}
+
 #define gmu_poll_timeout(gmu, addr, val, cond, interval, timeout) \
 	readl_poll_timeout((gmu)->mmio + ((addr) << 2), val, cond, \
 		interval, timeout)
-- 
1.9.1

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[PATCH v2 4/5] drm/msm: re-factor devfreq code

[Sharat Masetty]

The devfreq framework requires the drivers to provide busy time estimations.
The GPU driver relies on the hardware performance counteres for the busy time
estimations, but different hardware revisions have counters which can be
sourced from different clocks. So the busy time estimation will be target
dependent.  Additionally on targets where the clocks are completely controlled
by the on chip microcontroller, fetching and setting the current GPU frequency
will be different. This patch aims to embrace these differences by re-factoring
the devfreq code a bit.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 16 +++++++++---
 drivers/gpu/drm/msm/msm_gpu.c         | 49 ++++++++++++++++++++---------------
 drivers/gpu/drm/msm/msm_gpu.h         |  5 +++-
 3 files changed, 44 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 897f3e2..043e680 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1369,12 +1369,20 @@ static struct msm_ringbuffer *a5xx_active_ring(struct msm_gpu *gpu)
 	return a5xx_gpu->cur_ring;
 }
 
-static int a5xx_gpu_busy(struct msm_gpu *gpu, uint64_t *value)
+static unsigned long a5xx_gpu_busy(struct msm_gpu *gpu)
 {
-	*value = gpu_read64(gpu, REG_A5XX_RBBM_PERFCTR_RBBM_0_LO,
-		REG_A5XX_RBBM_PERFCTR_RBBM_0_HI);
+	u64 busy_cycles;
+	unsigned long busy_time;
 
-	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) /
+		(clk_get_rate(gpu->core_clk) / 1000000);
+
+	gpu->devfreq.busy_cycles = busy_cycles;
+
+	return busy_time;
 }
 
 static const struct adreno_gpu_funcs funcs = {
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 8d6bc0c..26c1c3a 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -36,12 +36,16 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
 	struct msm_gpu *gpu = platform_get_drvdata(to_platform_device(dev));
 	struct dev_pm_opp *opp;
 
-	opp = dev_pm_opp_find_freq_ceil(dev, freq);
+	opp = devfreq_recommended_opp(dev, freq, flags);
+	if (IS_ERR(opp))
+		return PTR_ERR(opp);
 
-	if (!IS_ERR(opp)) {
+	if (gpu->funcs->gpu_set_freq)
+		gpu->funcs->gpu_set_freq(gpu, (u64)*freq);
+	else
 		clk_set_rate(gpu->core_clk, *freq);
-		dev_pm_opp_put(opp);
-	}
+
+	dev_pm_opp_put(opp);
 
 	return 0;
 }
@@ -50,16 +54,14 @@ static int msm_devfreq_get_dev_status(struct device *dev,
 		struct devfreq_dev_status *status)
 {
 	struct msm_gpu *gpu = platform_get_drvdata(to_platform_device(dev));
-	u64 cycles;
 	ktime_t time;
 
-	status->current_frequency = (unsigned long) clk_get_rate(gpu->core_clk);
-	gpu->funcs->gpu_busy(gpu, &cycles);
-
-	status->busy_time = (cycles - gpu->devfreq.busy_cycles) /
-		(status->current_frequency / 1000000);
+	if (gpu->funcs->gpu_get_freq)
+		status->current_frequency = gpu->funcs->gpu_get_freq(gpu);
+	else
+		status->current_frequency = clk_get_rate(gpu->core_clk);
 
-	gpu->devfreq.busy_cycles = cycles;
+	status->busy_time = gpu->funcs->gpu_busy(gpu);
 
 	time = ktime_get();
 	status->total_time = ktime_us_delta(time, gpu->devfreq.time);
@@ -72,7 +74,10 @@ static int msm_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
 {
 	struct msm_gpu *gpu = platform_get_drvdata(to_platform_device(dev));
 
-	*freq = (unsigned long) clk_get_rate(gpu->core_clk);
+	if (gpu->funcs->gpu_get_freq)
+		*freq = gpu->funcs->gpu_get_freq(gpu);
+	else
+		*freq = clk_get_rate(gpu->core_clk);
 
 	return 0;
 }
@@ -87,7 +92,7 @@ static int msm_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
 static void msm_devfreq_init(struct msm_gpu *gpu)
 {
 	/* We need target support to do devfreq */
-	if (!gpu->funcs->gpu_busy || !gpu->core_clk)
+	if (!gpu->funcs->gpu_busy)
 		return;
 
 	msm_devfreq_profile.initial_freq = gpu->fast_rate;
@@ -185,6 +190,14 @@ static int disable_axi(struct msm_gpu *gpu)
 	return 0;
 }
 
+void msm_gpu_resume_devfreq(struct msm_gpu *gpu)
+{
+	gpu->devfreq.busy_cycles = 0;
+	gpu->devfreq.time = ktime_get();
+
+	devfreq_resume_device(gpu->devfreq.devfreq);
+}
+
 int msm_gpu_pm_resume(struct msm_gpu *gpu)
 {
 	int ret;
@@ -203,12 +216,7 @@ int msm_gpu_pm_resume(struct msm_gpu *gpu)
 	if (ret)
 		return ret;
 
-	if (gpu->devfreq.devfreq) {
-		gpu->devfreq.busy_cycles = 0;
-		gpu->devfreq.time = ktime_get();
-
-		devfreq_resume_device(gpu->devfreq.devfreq);
-	}
+	msm_gpu_resume_devfreq(gpu);
 
 	gpu->needs_hw_init = true;
 
@@ -221,8 +229,7 @@ int msm_gpu_pm_suspend(struct msm_gpu *gpu)
 
 	DBG("%s", gpu->name);
 
-	if (gpu->devfreq.devfreq)
-		devfreq_suspend_device(gpu->devfreq.devfreq);
+	devfreq_suspend_device(gpu->devfreq.devfreq);
 
 	ret = disable_axi(gpu);
 	if (ret)
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 2ae34e3..2446066 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -68,9 +68,11 @@ struct msm_gpu_funcs {
 	void (*show)(struct msm_gpu *gpu, struct msm_gpu_state *state,
 			struct drm_printer *p);
 #endif
-	int (*gpu_busy)(struct msm_gpu *gpu, uint64_t *value);
+	unsigned long (*gpu_busy)(struct msm_gpu *gpu);
 	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);
+	int (*gpu_set_freq)(struct msm_gpu *gpu, unsigned long freq);
 };
 
 struct msm_gpu {
@@ -262,6 +264,7 @@ static inline void gpu_write64(struct msm_gpu *gpu, u32 lo, u32 hi, u64 val)
 
 int msm_gpu_pm_suspend(struct msm_gpu *gpu);
 int msm_gpu_pm_resume(struct msm_gpu *gpu);
+void msm_gpu_resume_devfreq(struct msm_gpu *gpu);
 
 int msm_gpu_hw_init(struct msm_gpu *gpu);
 
-- 
1.9.1

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[PATCH v2 5/5] drm/msm/A6xx: Add devfreq support for A6xx

[Sharat Masetty]

Implement routines to estimate GPU busy time and fetching the
current frequency for the polling interval. This is required by
the devfreq framework which recommends a frequency change if needed.
The driver code then tries to set this new frequency on the GPU by
sending an Out Of Band(OOB) request to the GMU.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 39 +++++++++++++++++++++++++++++++----
 drivers/gpu/drm/msm/adreno/a6xx_gmu.h |  2 ++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 27 ++++++++++++++++++++++++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  2 ++
 4 files changed, 66 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index f6634c0..3a7b899 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -67,7 +67,7 @@ static bool a6xx_gmu_gx_is_on(struct a6xx_gmu *gmu)
 		A6XX_GMU_SPTPRAC_PWR_CLK_STATUS_GX_HM_CLK_OFF));
 }
 
-static int a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
+static int __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
 {
 	gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
 
@@ -84,7 +84,38 @@ static int a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
 	a6xx_gmu_set_oob(gmu, GMU_OOB_DCVS_SET);
 	a6xx_gmu_clear_oob(gmu, GMU_OOB_DCVS_SET);
 
-	return gmu_read(gmu, REG_A6XX_GMU_DCVS_RETURN);
+	if (gmu_read(gmu, REG_A6XX_GMU_DCVS_RETURN) != 0)
+		return -EINVAL;
+
+	gmu->freq = gmu->gpu_freqs[index];
+
+	return 0;
+}
+
+int a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq)
+{
+	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
+	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
+	u32 perf_index = 0;
+
+	if (freq == gmu->freq)
+		return 0;
+
+	for (perf_index = 0; perf_index < gmu->nr_gpu_freqs - 1; perf_index++)
+		if (freq == gmu->gpu_freqs[perf_index])
+			break;
+
+	return  __a6xx_gmu_set_freq(gmu, perf_index);
+}
+
+unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu)
+{
+	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
+	struct a6xx_gmu *gmu = &a6xx_gpu->gmu;
+
+	return  gmu->freq;
 }
 
 static bool a6xx_gmu_check_idle_level(struct a6xx_gmu *gmu)
@@ -630,7 +661,7 @@ int a6xx_gmu_reset(struct a6xx_gpu *a6xx_gpu)
 		ret = a6xx_hfi_start(gmu, GMU_COLD_BOOT);
 
 	/* Set the GPU back to the highest power frequency */
-	a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
+	__a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
 
 out:
 	if (ret)
@@ -671,7 +702,7 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
 	ret = a6xx_hfi_start(gmu, status);
 
 	/* Set the GPU to the highest power frequency */
-	a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
+	__a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
 
 out:
 	/* Make sure to turn off the boot OOB request on error */
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
index 09fd3a7..13b064f 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
@@ -77,6 +77,8 @@ struct a6xx_gmu {
 	unsigned long gmu_freqs[4];
 	u32 cx_arc_votes[4];
 
+	unsigned long freq;
+
 	struct a6xx_hfi_queue queues[2];
 
 	struct tasklet_struct hfi_tasklet;
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 3429d33a..af90706 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -7,6 +7,8 @@
 #include "a6xx_gpu.h"
 #include "a6xx_gmu.xml.h"
 
+#include <linux/devfreq.h>
+
 static inline bool _a6xx_check_idle(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
@@ -682,6 +684,8 @@ static int a6xx_pm_resume(struct msm_gpu *gpu)
 
 	gpu->needs_hw_init = true;
 
+	msm_gpu_resume_devfreq(gpu);
+
 	return ret;
 }
 
@@ -690,6 +694,8 @@ static int a6xx_pm_suspend(struct msm_gpu *gpu)
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
 	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
 
+	devfreq_suspend_device(gpu->devfreq.devfreq);
+
 	/*
 	 * Make sure the GMU is idle before continuing (because some transitions
 	 * may use VBIF
@@ -753,6 +759,24 @@ static void a6xx_destroy(struct msm_gpu *gpu)
 	kfree(a6xx_gpu);
 }
 
+static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
+{
+	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
+	struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
+	u64 busy_cycles;
+	unsigned long busy_time;
+
+	busy_cycles = gmu_read64(&a6xx_gpu->gmu,
+			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) / 192;
+
+	gpu->devfreq.busy_cycles = busy_cycles;
+
+	return busy_time;
+}
+
 static const struct adreno_gpu_funcs funcs = {
 	.base = {
 		.get_param = adreno_get_param,
@@ -768,6 +792,9 @@ static void a6xx_destroy(struct msm_gpu *gpu)
 #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP)
 		.show = a6xx_show,
 #endif
+		.gpu_busy = a6xx_gpu_busy,
+		.gpu_get_freq = a6xx_gmu_get_freq,
+		.gpu_set_freq = a6xx_gmu_set_freq,
 	},
 	.get_timestamp = a6xx_get_timestamp,
 };
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
index 32c2501..f236767 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
@@ -56,5 +56,7 @@ struct a6xx_gpu {
 
 int a6xx_gmu_probe(struct a6xx_gpu *a6xx_gpu, struct device_node *node, struct platform_device *gpu_pdev);
 void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu);
+int a6xx_gmu_set_freq(struct msm_gpu *gpu, unsigned long freq);
+unsigned long a6xx_gmu_get_freq(struct msm_gpu *gpu);
 
 #endif /* __A6XX_GPU_H__ */
-- 
1.9.1

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Re: [PATCH v2 2/5] drm/msm: unregister devfreq upon clean up

[Jordan Crouse]

On Mon, Aug 27, 2018 at 12:47:17PM +0530, Sharat Masetty wrote:
> Call the devfreq_remove_device() API to remove the GPU devfreq instance
> during GPU driver cleanup.
> 
> Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/msm_gpu.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index 04f9604..8d6bc0c 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -970,6 +970,8 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
>  
>  	WARN_ON(!list_empty(&gpu->active_list));
>  
> +	devm_devfreq_remove_device(&gpu->pdev->dev, gpu->devfreq.devfreq);
> +

Sorry, I don't think I made myself clear. We should use devm_devfreq_add_device
during initialization so that we don't need to do a devfreq_remove_device during
cleanup. This will still be a one line patch but in a different location.

Jordan

>  	for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
>  		msm_ringbuffer_destroy(gpu->rb[i]);
>  		gpu->rb[i] = NULL;
> -- 
> 1.9.1
> 

-- 
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a Linux Foundation Collaborative Project
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Re: [PATCH v2 4/5] drm/msm: re-factor devfreq code

[Jordan Crouse]

On Mon, Aug 27, 2018 at 12:47:19PM +0530, Sharat Masetty wrote:
> The devfreq framework requires the drivers to provide busy time estimations.
> The GPU driver relies on the hardware performance counteres for the busy time
> estimations, but different hardware revisions have counters which can be
> sourced from different clocks. So the busy time estimation will be target
> dependent.  Additionally on targets where the clocks are completely controlled
> by the on chip microcontroller, fetching and setting the current GPU frequency
> will be different. This patch aims to embrace these differences by re-factoring
> the devfreq code a bit.
> 
> Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 16 +++++++++---
>  drivers/gpu/drm/msm/msm_gpu.c         | 49 ++++++++++++++++++++---------------
>  drivers/gpu/drm/msm/msm_gpu.h         |  5 +++-
>  3 files changed, 44 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> index 897f3e2..043e680 100644
> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> @@ -1369,12 +1369,20 @@ static struct msm_ringbuffer *a5xx_active_ring(struct msm_gpu *gpu)
>  	return a5xx_gpu->cur_ring;
>  }
>  
> -static int a5xx_gpu_busy(struct msm_gpu *gpu, uint64_t *value)
> +static unsigned long a5xx_gpu_busy(struct msm_gpu *gpu)
>  {
> -	*value = gpu_read64(gpu, REG_A5XX_RBBM_PERFCTR_RBBM_0_LO,
> -		REG_A5XX_RBBM_PERFCTR_RBBM_0_HI);
> +	u64 busy_cycles;
> +	unsigned long busy_time;
>  
> -	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) /
> +		(clk_get_rate(gpu->core_clk) / 1000000);
> +
> +	gpu->devfreq.busy_cycles = busy_cycles;
> +
> +	return busy_time;
>  }
>  
>  static const struct adreno_gpu_funcs funcs = {
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index 8d6bc0c..26c1c3a 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -36,12 +36,16 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>  	struct msm_gpu *gpu = platform_get_drvdata(to_platform_device(dev));
>  	struct dev_pm_opp *opp;
>  
> -	opp = dev_pm_opp_find_freq_ceil(dev, freq);
> +	opp = devfreq_recommended_opp(dev, freq, flags);
> +	if (IS_ERR(opp))
> +		return PTR_ERR(opp);
>  
> -	if (!IS_ERR(opp)) {
> +	if (gpu->funcs->gpu_set_freq)
> +		gpu->funcs->gpu_set_freq(gpu, (u64)*freq);

Depending on how the interconnect patches end up looking it might make more
sense for us to send the OPP itself to gpu_set_freq() but we'll put a pin in
that until we know more.

Jordan

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Re: [PATCH v2 5/5] drm/msm/A6xx: Add devfreq support for A6xx

[Jordan Crouse]

On Mon, Aug 27, 2018 at 12:47:20PM +0530, Sharat Masetty wrote:
> Implement routines to estimate GPU busy time and fetching the
> current frequency for the polling interval. This is required by
> the devfreq framework which recommends a frequency change if needed.
> The driver code then tries to set this new frequency on the GPU by
> sending an Out Of Band(OOB) request to the GMU.
> 
> Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 39 +++++++++++++++++++++++++++++++----
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.h |  2 ++
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 27 ++++++++++++++++++++++++
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  2 ++
>  4 files changed, 66 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index f6634c0..3a7b899 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -67,7 +67,7 @@ static bool a6xx_gmu_gx_is_on(struct a6xx_gmu *gmu)
>  		A6XX_GMU_SPTPRAC_PWR_CLK_STATUS_GX_HM_CLK_OFF));
>  }
>  
> -static int a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
> +static int __a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
>  {
>  	gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
>  
> @@ -84,7 +84,38 @@ static int a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
>  	a6xx_gmu_set_oob(gmu, GMU_OOB_DCVS_SET);
>  	a6xx_gmu_clear_oob(gmu, GMU_OOB_DCVS_SET);
>  
> -	return gmu_read(gmu, REG_A6XX_GMU_DCVS_RETURN);
> +	if (gmu_read(gmu, REG_A6XX_GMU_DCVS_RETURN) != 0)
> +		return -EINVAL;
> +
> +	gmu->freq = gmu->gpu_freqs[index];
> +
> +	return 0;
> +}

While I was working on the interconnect patches it occurred to me that the upper
levels doesn't really care what the value of A6XX_GMU_DCVS_RETURN is so we might
want to just print an error message and return nothing. If the DCVS set didn't
work we might be headed for disaster on the GMU side but its more likely that
we'll just continue along at the current frequency for the next cycle so it
isn't terribly harmful.

Jordan

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