cpufreq: cppc: Reorder code and remove apply_hisi_workaround variable

Message ID b217dc843935e3f86584a73893d330fd99a4e472.1592889188.git.viresh.kumar@linaro.org
State Accepted
Commit d88b0f0edb9041be6feff98e83cd6002e4ab534e
Headers show
Series
  • cpufreq: cppc: Reorder code and remove apply_hisi_workaround variable
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Commit Message

Viresh Kumar June 23, 2020, 5:15 a.m.
With the current approach we have an extra check in the
cppc_cpufreq_get_rate() callback, which checks if hisilicon's get rate
implementation should be used instead. While it works fine, the approach
isn't very straight forward, over that we have an extra check in the
routine.

Rearrange code and update the cpufreq driver's get() callback pointer
directly for the hisilicon case. This gets the extra variable is removed
and the extra check isn't required anymore as well.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

---
Xiongfeng Wang, will it be possible for you to give this a try as I
can't really test it locally.

 drivers/cpufreq/cppc_cpufreq.c | 91 ++++++++++++++++------------------
 1 file changed, 42 insertions(+), 49 deletions(-)

-- 
2.25.0.rc1.19.g042ed3e048af

Comments

Xiongfeng Wang June 23, 2020, 7:03 a.m. | #1
Hi Viresh,

On 2020/6/23 13:15, Viresh Kumar wrote:
> With the current approach we have an extra check in the

> cppc_cpufreq_get_rate() callback, which checks if hisilicon's get rate

> implementation should be used instead. While it works fine, the approach

> isn't very straight forward, over that we have an extra check in the

> routine.

> 

> Rearrange code and update the cpufreq driver's get() callback pointer

> directly for the hisilicon case. This gets the extra variable is removed

> and the extra check isn't required anymore as well.

> 

> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

> ---

> Xiongfeng Wang, will it be possible for you to give this a try as I

> can't really test it locally.


I have tested it on D05. It works well.

Tested-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>



Thanks,
Xiongfeng

> 

>  drivers/cpufreq/cppc_cpufreq.c | 91 ++++++++++++++++------------------

>  1 file changed, 42 insertions(+), 49 deletions(-)

> 

> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c

> index 257d726a4456..03a21daddbec 100644

> --- a/drivers/cpufreq/cppc_cpufreq.c

> +++ b/drivers/cpufreq/cppc_cpufreq.c

> @@ -45,8 +45,6 @@ struct cppc_workaround_oem_info {

>  	u32 oem_revision;

>  };

>  

> -static bool apply_hisi_workaround;

> -

>  static struct cppc_workaround_oem_info wa_info[] = {

>  	{

>  		.oem_id		= "HISI  ",

> @@ -59,50 +57,6 @@ static struct cppc_workaround_oem_info wa_info[] = {

>  	}

>  };

>  

> -static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu,

> -					unsigned int perf);

> -

> -/*

> - * HISI platform does not support delivered performance counter and

> - * reference performance counter. It can calculate the performance using the

> - * platform specific mechanism. We reuse the desired performance register to

> - * store the real performance calculated by the platform.

> - */

> -static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpunum)

> -{

> -	struct cppc_cpudata *cpudata = all_cpu_data[cpunum];

> -	u64 desired_perf;

> -	int ret;

> -

> -	ret = cppc_get_desired_perf(cpunum, &desired_perf);

> -	if (ret < 0)

> -		return -EIO;

> -

> -	return cppc_cpufreq_perf_to_khz(cpudata, desired_perf);

> -}

> -

> -static void cppc_check_hisi_workaround(void)

> -{

> -	struct acpi_table_header *tbl;

> -	acpi_status status = AE_OK;

> -	int i;

> -

> -	status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);

> -	if (ACPI_FAILURE(status) || !tbl)

> -		return;

> -

> -	for (i = 0; i < ARRAY_SIZE(wa_info); i++) {

> -		if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&

> -		    !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&

> -		    wa_info[i].oem_revision == tbl->oem_revision) {

> -			apply_hisi_workaround = true;

> -			break;

> -		}

> -	}

> -

> -	acpi_put_table(tbl);

> -}

> -

>  /* Callback function used to retrieve the max frequency from DMI */

>  static void cppc_find_dmi_mhz(const struct dmi_header *dm, void *private)

>  {

> @@ -402,9 +356,6 @@ static unsigned int cppc_cpufreq_get_rate(unsigned int cpunum)

>  	struct cppc_cpudata *cpu = all_cpu_data[cpunum];

>  	int ret;

>  

> -	if (apply_hisi_workaround)

> -		return hisi_cppc_cpufreq_get_rate(cpunum);

> -

>  	ret = cppc_get_perf_ctrs(cpunum, &fb_ctrs_t0);

>  	if (ret)

>  		return ret;

> @@ -455,6 +406,48 @@ static struct cpufreq_driver cppc_cpufreq_driver = {

>  	.name = "cppc_cpufreq",

>  };

>  

> +/*

> + * HISI platform does not support delivered performance counter and

> + * reference performance counter. It can calculate the performance using the

> + * platform specific mechanism. We reuse the desired performance register to

> + * store the real performance calculated by the platform.

> + */

> +static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpunum)

> +{

> +	struct cppc_cpudata *cpudata = all_cpu_data[cpunum];

> +	u64 desired_perf;

> +	int ret;

> +

> +	ret = cppc_get_desired_perf(cpunum, &desired_perf);

> +	if (ret < 0)

> +		return -EIO;

> +

> +	return cppc_cpufreq_perf_to_khz(cpudata, desired_perf);

> +}

> +

> +static void cppc_check_hisi_workaround(void)

> +{

> +	struct acpi_table_header *tbl;

> +	acpi_status status = AE_OK;

> +	int i;

> +

> +	status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);

> +	if (ACPI_FAILURE(status) || !tbl)

> +		return;

> +

> +	for (i = 0; i < ARRAY_SIZE(wa_info); i++) {

> +		if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&

> +		    !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&

> +		    wa_info[i].oem_revision == tbl->oem_revision) {

> +			/* Overwrite the get() callback */

> +			cppc_cpufreq_driver.get = hisi_cppc_cpufreq_get_rate;

> +			break;

> +		}

> +	}

> +

> +	acpi_put_table(tbl);

> +}

> +

>  static int __init cppc_cpufreq_init(void)

>  {

>  	int i, ret = 0;

>
Rafael J. Wysocki June 30, 2020, 6:37 p.m. | #2
On Tue, Jun 23, 2020 at 7:15 AM Viresh Kumar <viresh.kumar@linaro.org> wrote:
>

> With the current approach we have an extra check in the

> cppc_cpufreq_get_rate() callback, which checks if hisilicon's get rate

> implementation should be used instead. While it works fine, the approach

> isn't very straight forward, over that we have an extra check in the

> routine.

>

> Rearrange code and update the cpufreq driver's get() callback pointer

> directly for the hisilicon case. This gets the extra variable is removed

> and the extra check isn't required anymore as well.

>

> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

> ---

> Xiongfeng Wang, will it be possible for you to give this a try as I

> can't really test it locally.

>

>  drivers/cpufreq/cppc_cpufreq.c | 91 ++++++++++++++++------------------

>  1 file changed, 42 insertions(+), 49 deletions(-)

>

> diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c

> index 257d726a4456..03a21daddbec 100644

> --- a/drivers/cpufreq/cppc_cpufreq.c

> +++ b/drivers/cpufreq/cppc_cpufreq.c

> @@ -45,8 +45,6 @@ struct cppc_workaround_oem_info {

>         u32 oem_revision;

>  };

>

> -static bool apply_hisi_workaround;

> -

>  static struct cppc_workaround_oem_info wa_info[] = {

>         {

>                 .oem_id         = "HISI  ",

> @@ -59,50 +57,6 @@ static struct cppc_workaround_oem_info wa_info[] = {

>         }

>  };

>

> -static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu,

> -                                       unsigned int perf);

> -

> -/*

> - * HISI platform does not support delivered performance counter and

> - * reference performance counter. It can calculate the performance using the

> - * platform specific mechanism. We reuse the desired performance register to

> - * store the real performance calculated by the platform.

> - */

> -static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpunum)

> -{

> -       struct cppc_cpudata *cpudata = all_cpu_data[cpunum];

> -       u64 desired_perf;

> -       int ret;

> -

> -       ret = cppc_get_desired_perf(cpunum, &desired_perf);

> -       if (ret < 0)

> -               return -EIO;

> -

> -       return cppc_cpufreq_perf_to_khz(cpudata, desired_perf);

> -}

> -

> -static void cppc_check_hisi_workaround(void)

> -{

> -       struct acpi_table_header *tbl;

> -       acpi_status status = AE_OK;

> -       int i;

> -

> -       status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);

> -       if (ACPI_FAILURE(status) || !tbl)

> -               return;

> -

> -       for (i = 0; i < ARRAY_SIZE(wa_info); i++) {

> -               if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&

> -                   !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&

> -                   wa_info[i].oem_revision == tbl->oem_revision) {

> -                       apply_hisi_workaround = true;

> -                       break;

> -               }

> -       }

> -

> -       acpi_put_table(tbl);

> -}

> -

>  /* Callback function used to retrieve the max frequency from DMI */

>  static void cppc_find_dmi_mhz(const struct dmi_header *dm, void *private)

>  {

> @@ -402,9 +356,6 @@ static unsigned int cppc_cpufreq_get_rate(unsigned int cpunum)

>         struct cppc_cpudata *cpu = all_cpu_data[cpunum];

>         int ret;

>

> -       if (apply_hisi_workaround)

> -               return hisi_cppc_cpufreq_get_rate(cpunum);

> -

>         ret = cppc_get_perf_ctrs(cpunum, &fb_ctrs_t0);

>         if (ret)

>                 return ret;

> @@ -455,6 +406,48 @@ static struct cpufreq_driver cppc_cpufreq_driver = {

>         .name = "cppc_cpufreq",

>  };

>

> +/*

> + * HISI platform does not support delivered performance counter and

> + * reference performance counter. It can calculate the performance using the

> + * platform specific mechanism. We reuse the desired performance register to

> + * store the real performance calculated by the platform.

> + */

> +static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpunum)

> +{

> +       struct cppc_cpudata *cpudata = all_cpu_data[cpunum];

> +       u64 desired_perf;

> +       int ret;

> +

> +       ret = cppc_get_desired_perf(cpunum, &desired_perf);

> +       if (ret < 0)

> +               return -EIO;

> +

> +       return cppc_cpufreq_perf_to_khz(cpudata, desired_perf);

> +}

> +

> +static void cppc_check_hisi_workaround(void)

> +{

> +       struct acpi_table_header *tbl;

> +       acpi_status status = AE_OK;

> +       int i;

> +

> +       status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);

> +       if (ACPI_FAILURE(status) || !tbl)

> +               return;

> +

> +       for (i = 0; i < ARRAY_SIZE(wa_info); i++) {

> +               if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&

> +                   !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&

> +                   wa_info[i].oem_revision == tbl->oem_revision) {

> +                       /* Overwrite the get() callback */

> +                       cppc_cpufreq_driver.get = hisi_cppc_cpufreq_get_rate;

> +                       break;

> +               }

> +       }

> +

> +       acpi_put_table(tbl);

> +}

> +

>  static int __init cppc_cpufreq_init(void)

>  {

>         int i, ret = 0;

> --


Applied as 5.9 material, thanks!

Patch

diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 257d726a4456..03a21daddbec 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -45,8 +45,6 @@  struct cppc_workaround_oem_info {
 	u32 oem_revision;
 };
 
-static bool apply_hisi_workaround;
-
 static struct cppc_workaround_oem_info wa_info[] = {
 	{
 		.oem_id		= "HISI  ",
@@ -59,50 +57,6 @@  static struct cppc_workaround_oem_info wa_info[] = {
 	}
 };
 
-static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu,
-					unsigned int perf);
-
-/*
- * HISI platform does not support delivered performance counter and
- * reference performance counter. It can calculate the performance using the
- * platform specific mechanism. We reuse the desired performance register to
- * store the real performance calculated by the platform.
- */
-static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpunum)
-{
-	struct cppc_cpudata *cpudata = all_cpu_data[cpunum];
-	u64 desired_perf;
-	int ret;
-
-	ret = cppc_get_desired_perf(cpunum, &desired_perf);
-	if (ret < 0)
-		return -EIO;
-
-	return cppc_cpufreq_perf_to_khz(cpudata, desired_perf);
-}
-
-static void cppc_check_hisi_workaround(void)
-{
-	struct acpi_table_header *tbl;
-	acpi_status status = AE_OK;
-	int i;
-
-	status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);
-	if (ACPI_FAILURE(status) || !tbl)
-		return;
-
-	for (i = 0; i < ARRAY_SIZE(wa_info); i++) {
-		if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&
-		    !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
-		    wa_info[i].oem_revision == tbl->oem_revision) {
-			apply_hisi_workaround = true;
-			break;
-		}
-	}
-
-	acpi_put_table(tbl);
-}
-
 /* Callback function used to retrieve the max frequency from DMI */
 static void cppc_find_dmi_mhz(const struct dmi_header *dm, void *private)
 {
@@ -402,9 +356,6 @@  static unsigned int cppc_cpufreq_get_rate(unsigned int cpunum)
 	struct cppc_cpudata *cpu = all_cpu_data[cpunum];
 	int ret;
 
-	if (apply_hisi_workaround)
-		return hisi_cppc_cpufreq_get_rate(cpunum);
-
 	ret = cppc_get_perf_ctrs(cpunum, &fb_ctrs_t0);
 	if (ret)
 		return ret;
@@ -455,6 +406,48 @@  static struct cpufreq_driver cppc_cpufreq_driver = {
 	.name = "cppc_cpufreq",
 };
 
+/*
+ * HISI platform does not support delivered performance counter and
+ * reference performance counter. It can calculate the performance using the
+ * platform specific mechanism. We reuse the desired performance register to
+ * store the real performance calculated by the platform.
+ */
+static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpunum)
+{
+	struct cppc_cpudata *cpudata = all_cpu_data[cpunum];
+	u64 desired_perf;
+	int ret;
+
+	ret = cppc_get_desired_perf(cpunum, &desired_perf);
+	if (ret < 0)
+		return -EIO;
+
+	return cppc_cpufreq_perf_to_khz(cpudata, desired_perf);
+}
+
+static void cppc_check_hisi_workaround(void)
+{
+	struct acpi_table_header *tbl;
+	acpi_status status = AE_OK;
+	int i;
+
+	status = acpi_get_table(ACPI_SIG_PCCT, 0, &tbl);
+	if (ACPI_FAILURE(status) || !tbl)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(wa_info); i++) {
+		if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&
+		    !memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
+		    wa_info[i].oem_revision == tbl->oem_revision) {
+			/* Overwrite the get() callback */
+			cppc_cpufreq_driver.get = hisi_cppc_cpufreq_get_rate;
+			break;
+		}
+	}
+
+	acpi_put_table(tbl);
+}
+
 static int __init cppc_cpufreq_init(void)
 {
 	int i, ret = 0;