[PATCH 0/3] drm/msm: re-factor devfreq common code

[PATCH 0/3] drm/msm: re-factor devfreq common code

[Sharat Masetty]

This series re-factors the devfreq code a bit in preparation for the upcoming
A6x related devfreq changes. The code applies cleanly on 4.17 and has been
verified on DB820C.

Sharat Masetty (3):
  drm/msm: suspend devfreq on init
  drm/msm: move suspend/resume devfreq to their own functions
  drm/msm: re-factor devfreq code

 drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 15 ++++++++---
 drivers/gpu/drm/msm/msm_gpu.c         | 51 +++++++++++++++++++++++------------
 drivers/gpu/drm/msm/msm_gpu.h         |  6 ++++-
 3 files changed, 50 insertions(+), 22 deletions(-)

--
1.9.1
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[PATCH 1/3] 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 1c09acf..d7586f2 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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Re: [PATCH 1/3] drm/msm: suspend devfreq on init

[Jordan Crouse]

On Fri, May 25, 2018 at 04:00:44PM +0530, Sharat Masetty wrote:
> 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>

Reviewed-by: Jordan Crouse <jcrouse@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 1c09acf..d7586f2 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 2/3] drm/msm: move suspend/resume devfreq to their own functions

[Sharat Masetty]

This is needed for hardware revisions which do not rely on the generic
suspend, resume handlers for power management.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gpu.c | 26 ++++++++++++++++++--------
 drivers/gpu/drm/msm/msm_gpu.h |  2 ++
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index d7586f2..d8d4fc9 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -203,6 +203,22 @@ static int disable_axi(struct msm_gpu *gpu)
 	return 0;
 }
 
+void msm_gpu_resume_devfreq(struct msm_gpu *gpu)
+{
+	if (gpu->devfreq.devfreq) {
+		gpu->devfreq.busy_cycles = 0;
+		gpu->devfreq.time = ktime_get();
+
+		devfreq_resume_device(gpu->devfreq.devfreq);
+	}
+}
+
+void msm_gpu_suspend_devfreq(struct msm_gpu *gpu)
+{
+	if (gpu->devfreq.devfreq)
+		devfreq_suspend_device(gpu->devfreq.devfreq);
+}
+
 int msm_gpu_pm_resume(struct msm_gpu *gpu)
 {
 	int ret;
@@ -221,12 +237,7 @@ 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;
 
@@ -239,8 +250,7 @@ int msm_gpu_pm_suspend(struct msm_gpu *gpu)
 
 	DBG("%s", gpu->name);
 
-	if (gpu->devfreq.devfreq)
-		devfreq_suspend_device(gpu->devfreq.devfreq);
+	msm_gpu_suspend_devfreq(gpu);
 
 	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 b824117..1876b81 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -226,6 +226,8 @@ 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);
+void msm_gpu_suspend_devfreq(struct msm_gpu *gpu);
 
 int msm_gpu_hw_init(struct msm_gpu *gpu);
 
-- 
1.9.1

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Re: [PATCH 2/3] drm/msm: move suspend/resume devfreq to their own functions

[Jordan Crouse]

On Fri, May 25, 2018 at 04:00:45PM +0530, Sharat Masetty wrote:
> This is needed for hardware revisions which do not rely on the generic
> suspend, resume handlers for power management.
> 
> Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
> ---
>  drivers/gpu/drm/msm/msm_gpu.c | 26 ++++++++++++++++++--------
>  drivers/gpu/drm/msm/msm_gpu.h |  2 ++
>  2 files changed, 20 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index d7586f2..d8d4fc9 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -203,6 +203,22 @@ static int disable_axi(struct msm_gpu *gpu)
>  	return 0;
>  }
>  
> +void msm_gpu_resume_devfreq(struct msm_gpu *gpu)
> +{
> +	if (gpu->devfreq.devfreq) {
> +		gpu->devfreq.busy_cycles = 0;
> +		gpu->devfreq.time = ktime_get();
> +
> +		devfreq_resume_device(gpu->devfreq.devfreq);
> +	}

I just looked, we don't need the if() check - devfreq_resume_device should be
safe.  Yeah, we're doing an extra ktime_get() but its not the end of the world.

> +}
> +
> +void msm_gpu_suspend_devfreq(struct msm_gpu *gpu)
> +{
> +	if (gpu->devfreq.devfreq)
> +		devfreq_suspend_device(gpu->devfreq.devfreq);

We don't need the if check here either.

> +}
> +
>  int msm_gpu_pm_resume(struct msm_gpu *gpu)
>  {
>  	int ret;
> @@ -221,12 +237,7 @@ 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;
>  
> @@ -239,8 +250,7 @@ int msm_gpu_pm_suspend(struct msm_gpu *gpu)
>  
>  	DBG("%s", gpu->name);
>  
> -	if (gpu->devfreq.devfreq)
> -		devfreq_suspend_device(gpu->devfreq.devfreq);
> +	msm_gpu_suspend_devfreq(gpu);
>  
>  	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 b824117..1876b81 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.h
> +++ b/drivers/gpu/drm/msm/msm_gpu.h
> @@ -226,6 +226,8 @@ 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);
> +void msm_gpu_suspend_devfreq(struct msm_gpu *gpu);
>  
>  int msm_gpu_hw_init(struct msm_gpu *gpu);
>  
> -- 
> 1.9.1
> 

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[PATCH 3/3] drm/msm: re-factor devfreq code

[Sharat Masetty]

devfreq framework requires the drivers to provide busy time estimations.
The GPU driver relies on the hardware performance counters 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 | 15 +++++++++++----
 drivers/gpu/drm/msm/msm_gpu.c         | 23 ++++++++++++++---------
 drivers/gpu/drm/msm/msm_gpu.h         |  4 +++-
 3 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index d39400e..a35a840 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1219,12 +1219,19 @@ 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 u64 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, 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 d8d4fc9..f437ee8 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -40,7 +40,11 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
 	if (IS_ERR(opp))
 		return PTR_ERR(opp);
 
-	clk_set_rate(gpu->core_clk, *freq);
+	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);
 
 	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;
-	u32 freq = ((u32) status->current_frequency) / 1000000;
 	ktime_t time;
 
-	status->current_frequency = (unsigned long) clk_get_rate(gpu->core_clk);
-	gpu->funcs->gpu_busy(gpu, &cycles);
-
-	status->busy_time = ((u32) (cycles - gpu->devfreq.busy_cycles)) / freq;
+	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;
 }
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index 1876b81..d3f02e7 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -68,7 +68,9 @@ struct msm_gpu_funcs {
 	/* for generation specific debugfs: */
 	int (*debugfs_init)(struct msm_gpu *gpu, struct drm_minor *minor);
 #endif
-	int (*gpu_busy)(struct msm_gpu *gpu, uint64_t *value);
+	u64 (*gpu_busy)(struct msm_gpu *gpu);
+	u64 (*gpu_get_freq)(struct msm_gpu *gpu);
+	int (*gpu_set_freq)(struct msm_gpu *gpu, u64 freq);
 };
 
 struct msm_gpu {
-- 
1.9.1

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Re: [PATCH 3/3] drm/msm: re-factor devfreq code

[Jordan Crouse]

On Fri, May 25, 2018 at 04:00:46PM +0530, Sharat Masetty wrote:
> devfreq framework requires the drivers to provide busy time estimations.
> The GPU driver relies on the hardware performance counters 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 | 15 +++++++++++----
>  drivers/gpu/drm/msm/msm_gpu.c         | 23 ++++++++++++++---------
>  drivers/gpu/drm/msm/msm_gpu.h         |  4 +++-
>  3 files changed, 28 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> index d39400e..a35a840 100644
> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
> @@ -1219,12 +1219,19 @@ 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 u64 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, 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 d8d4fc9..f437ee8 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -40,7 +40,11 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq,
>  	if (IS_ERR(opp))
>  		return PTR_ERR(opp);
>  
> -	clk_set_rate(gpu->core_clk, *freq);
> +	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);
>  
>  	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;
> -	u32 freq = ((u32) status->current_frequency) / 1000000;
>  	ktime_t time;
>  
> -	status->current_frequency = (unsigned long) clk_get_rate(gpu->core_clk);
> -	gpu->funcs->gpu_busy(gpu, &cycles);
> -
> -	status->busy_time = ((u32) (cycles - gpu->devfreq.busy_cycles)) / freq;
> +	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);

This will get ugly on a 32 bit build.  I think that as long as the reset of the
subsystem uses unsigned long we might as well too. I can put on my fortune
tellers hat and guess we're probably not going to see a 4GB core running on a 32
bit target in the near future.

>  	return 0;
>  }
> diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
> index 1876b81..d3f02e7 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.h
> +++ b/drivers/gpu/drm/msm/msm_gpu.h
> @@ -68,7 +68,9 @@ struct msm_gpu_funcs {
>  	/* for generation specific debugfs: */
>  	int (*debugfs_init)(struct msm_gpu *gpu, struct drm_minor *minor);
>  #endif
> -	int (*gpu_busy)(struct msm_gpu *gpu, uint64_t *value);
> +	u64 (*gpu_busy)(struct msm_gpu *gpu);
> +	u64 (*gpu_get_freq)(struct msm_gpu *gpu);
> +	int (*gpu_set_freq)(struct msm_gpu *gpu, u64 freq);

So go ahead and change both of these to an unsigned long and that should help
the casting.

Jordan

>  };
>  
>  struct msm_gpu {
> -- 
> 1.9.1
> 

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Re: [PATCH 3/3] drm/msm: re-factor devfreq code

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 1113 bytes --]

Hi Sharat,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on robclark/msm-next]
[also build test ERROR on v4.17-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Sharat-Masetty/drm-msm-re-factor-devfreq-common-code/20180527-191724
base:   git://people.freedesktop.org/~robclark/linux msm-next
config: arm-multi_v7_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/msm/adreno/a5xx_gpu.o: In function `a5xx_gpu_busy':
>> a5xx_gpu.c:(.text+0xcc): undefined reference to `__aeabi_uldivmod'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 43470 bytes --]

[-- Attachment #3: Type: text/plain, Size: 160 bytes --]

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