[PATCH v2] perf: CXL: fix CPMU filter value mask length

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* [PATCH v2] perf: CXL: fix CPMU filter value mask length
       [not found] <CGME20240215080906epcms2p2c49c6b9bfe271e1d089ad35ab527b958@epcms2p2>
@ 2024-02-15  8:09   ` Hojin Nam
  0 siblings, 0 replies; 6+ messages in thread
From: Hojin Nam @ 2024-02-15  8:09 UTC (permalink / raw)
  To: linux-cxl@vger.kernel.org, jonathan.cameron@huawei.com
  Cc: Wonjae Lee, KyungSan Kim, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, will@kernel.org,
	mark.rutland@arm.com

CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
However, it is used as 2B length in code and comments.

Signed-off-by: Hojin Nam <hj96.nam@samsung.com>
---

Hi Jonathan,
as you said, I didn't actually hit this. I just found it by simply
comparing the code to the CXL Spec. I removed Fixes tag and 
repaired broken sign off, Thank you!

Changes since v1:
- Remove Fixes tag (Jonathan)
- Repair broken sign off (Jonathan)

 drivers/perf/cxl_pmu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
index 365d964b0f6a..ca5e92f28b4a 100644
--- a/drivers/perf/cxl_pmu.c
+++ b/drivers/perf/cxl_pmu.c
@@ -59,7 +59,7 @@
 #define   CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK     GENMASK_ULL(63, 59)

 #define CXL_PMU_FILTER_CFG_REG(n, f)   (0x400 + 4 * ((f) + (n) * 8))
-#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(15, 0)
+#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(31, 0)

 #define CXL_PMU_COUNTER_REG(n)         (0xc00 + 8 * (n))

@@ -314,9 +314,9 @@ static bool cxl_pmu_config1_get_edge(struct perf_event *event)
 }

 /*
- * CPMU specification allows for 8 filters, each with a 16 bit value...
- * So we need to find 8x16bits to store it in.
- * As the value used for disable is 0xffff, a separate enable switch
+ * CPMU specification allows for 8 filters, each with a 32 bit value...
+ * So we need to find 8x32bits to store it in.
+ * As the value used for disable is 0xffff_ffff, a separate enable switch
  * is needed.
  */

@@ -642,7 +642,7 @@ static void cxl_pmu_event_start(struct perf_event *event, int flags)
                if (cxl_pmu_config1_hdm_filter_en(event))
                        cfg = cxl_pmu_config2_get_hdm_decoder(event);
                else
-                       cfg = GENMASK(15, 0); /* No filtering if 0xFFFF_FFFF */
+                       cfg = GENMASK(31, 0); /* No filtering if 0xFFFF_FFFF */
                writeq(cfg, base + CXL_PMU_FILTER_CFG_REG(hwc->idx, 0));
        }

--
2.34.1

^ permalink raw reply related	[flat|nested] 6+ messages in thread

* [PATCH v2] perf: CXL: fix CPMU filter value mask length
@ 2024-02-15  8:09   ` Hojin Nam
  0 siblings, 0 replies; 6+ messages in thread
From: Hojin Nam @ 2024-02-15  8:09 UTC (permalink / raw)
  To: linux-cxl@vger.kernel.org, jonathan.cameron@huawei.com
  Cc: Wonjae Lee, KyungSan Kim, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, will@kernel.org,
	mark.rutland@arm.com

CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
However, it is used as 2B length in code and comments.

Signed-off-by: Hojin Nam <hj96.nam@samsung.com>
---

Hi Jonathan,
as you said, I didn't actually hit this. I just found it by simply
comparing the code to the CXL Spec. I removed Fixes tag and 
repaired broken sign off, Thank you!

Changes since v1:
- Remove Fixes tag (Jonathan)
- Repair broken sign off (Jonathan)

 drivers/perf/cxl_pmu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
index 365d964b0f6a..ca5e92f28b4a 100644
--- a/drivers/perf/cxl_pmu.c
+++ b/drivers/perf/cxl_pmu.c
@@ -59,7 +59,7 @@
 #define   CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK     GENMASK_ULL(63, 59)

 #define CXL_PMU_FILTER_CFG_REG(n, f)   (0x400 + 4 * ((f) + (n) * 8))
-#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(15, 0)
+#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(31, 0)

 #define CXL_PMU_COUNTER_REG(n)         (0xc00 + 8 * (n))

@@ -314,9 +314,9 @@ static bool cxl_pmu_config1_get_edge(struct perf_event *event)
 }

 /*
- * CPMU specification allows for 8 filters, each with a 16 bit value...
- * So we need to find 8x16bits to store it in.
- * As the value used for disable is 0xffff, a separate enable switch
+ * CPMU specification allows for 8 filters, each with a 32 bit value...
+ * So we need to find 8x32bits to store it in.
+ * As the value used for disable is 0xffff_ffff, a separate enable switch
  * is needed.
  */

@@ -642,7 +642,7 @@ static void cxl_pmu_event_start(struct perf_event *event, int flags)
                if (cxl_pmu_config1_hdm_filter_en(event))
                        cfg = cxl_pmu_config2_get_hdm_decoder(event);
                else
-                       cfg = GENMASK(15, 0); /* No filtering if 0xFFFF_FFFF */
+                       cfg = GENMASK(31, 0); /* No filtering if 0xFFFF_FFFF */
                writeq(cfg, base + CXL_PMU_FILTER_CFG_REG(hwc->idx, 0));
        }

--
2.34.1

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 6+ messages in thread

* Re: [PATCH v2] perf: CXL: fix CPMU filter value mask length
  2024-02-15  8:09   ` Hojin Nam
@ 2024-02-15  9:27     ` Jonathan Cameron
  -1 siblings, 0 replies; 6+ messages in thread
From: Jonathan Cameron @ 2024-02-15  9:27 UTC (permalink / raw)
  To: Hojin Nam
  Cc: linux-cxl@vger.kernel.org, Wonjae Lee, KyungSan Kim,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, will@kernel.org,
	mark.rutland@arm.com

On Thu, 15 Feb 2024 17:09:06 +0900
Hojin Nam <hj96.nam@samsung.com> wrote:

> CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
> However, it is used as 2B length in code and comments.
> 
> Signed-off-by: Hojin Nam <hj96.nam@samsung.com>

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Thanks for tidying this up.

> ---
> 
> Hi Jonathan,
> as you said, I didn't actually hit this. I just found it by simply
> comparing the code to the CXL Spec. I removed Fixes tag and 
> repaired broken sign off, Thank you!
> 
> Changes since v1:
> - Remove Fixes tag (Jonathan)
> - Repair broken sign off (Jonathan)
> 
>  drivers/perf/cxl_pmu.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
> index 365d964b0f6a..ca5e92f28b4a 100644
> --- a/drivers/perf/cxl_pmu.c
> +++ b/drivers/perf/cxl_pmu.c
> @@ -59,7 +59,7 @@
>  #define   CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK     GENMASK_ULL(63, 59)
> 
>  #define CXL_PMU_FILTER_CFG_REG(n, f)   (0x400 + 4 * ((f) + (n) * 8))
> -#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(15, 0)
> +#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(31, 0)
> 
>  #define CXL_PMU_COUNTER_REG(n)         (0xc00 + 8 * (n))
> 
> @@ -314,9 +314,9 @@ static bool cxl_pmu_config1_get_edge(struct perf_event *event)
>  }
> 
>  /*
> - * CPMU specification allows for 8 filters, each with a 16 bit value...
> - * So we need to find 8x16bits to store it in.
> - * As the value used for disable is 0xffff, a separate enable switch
> + * CPMU specification allows for 8 filters, each with a 32 bit value...
> + * So we need to find 8x32bits to store it in.
> + * As the value used for disable is 0xffff_ffff, a separate enable switch
>   * is needed.
>   */
> 
> @@ -642,7 +642,7 @@ static void cxl_pmu_event_start(struct perf_event *event, int flags)
>                 if (cxl_pmu_config1_hdm_filter_en(event))
>                         cfg = cxl_pmu_config2_get_hdm_decoder(event);
>                 else
> -                       cfg = GENMASK(15, 0); /* No filtering if 0xFFFF_FFFF */
> +                       cfg = GENMASK(31, 0); /* No filtering if 0xFFFF_FFFF */
>                 writeq(cfg, base + CXL_PMU_FILTER_CFG_REG(hwc->idx, 0));
>         }
> 
> --
> 2.34.1


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH v2] perf: CXL: fix CPMU filter value mask length
@ 2024-02-15  9:27     ` Jonathan Cameron
  0 siblings, 0 replies; 6+ messages in thread
From: Jonathan Cameron @ 2024-02-15  9:27 UTC (permalink / raw)
  To: Hojin Nam
  Cc: linux-cxl@vger.kernel.org, Wonjae Lee, KyungSan Kim,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, will@kernel.org,
	mark.rutland@arm.com

On Thu, 15 Feb 2024 17:09:06 +0900
Hojin Nam <hj96.nam@samsung.com> wrote:

> CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
> However, it is used as 2B length in code and comments.
> 
> Signed-off-by: Hojin Nam <hj96.nam@samsung.com>

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Thanks for tidying this up.

> ---
> 
> Hi Jonathan,
> as you said, I didn't actually hit this. I just found it by simply
> comparing the code to the CXL Spec. I removed Fixes tag and 
> repaired broken sign off, Thank you!
> 
> Changes since v1:
> - Remove Fixes tag (Jonathan)
> - Repair broken sign off (Jonathan)
> 
>  drivers/perf/cxl_pmu.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
> index 365d964b0f6a..ca5e92f28b4a 100644
> --- a/drivers/perf/cxl_pmu.c
> +++ b/drivers/perf/cxl_pmu.c
> @@ -59,7 +59,7 @@
>  #define   CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK     GENMASK_ULL(63, 59)
> 
>  #define CXL_PMU_FILTER_CFG_REG(n, f)   (0x400 + 4 * ((f) + (n) * 8))
> -#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(15, 0)
> +#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(31, 0)
> 
>  #define CXL_PMU_COUNTER_REG(n)         (0xc00 + 8 * (n))
> 
> @@ -314,9 +314,9 @@ static bool cxl_pmu_config1_get_edge(struct perf_event *event)
>  }
> 
>  /*
> - * CPMU specification allows for 8 filters, each with a 16 bit value...
> - * So we need to find 8x16bits to store it in.
> - * As the value used for disable is 0xffff, a separate enable switch
> + * CPMU specification allows for 8 filters, each with a 32 bit value...
> + * So we need to find 8x32bits to store it in.
> + * As the value used for disable is 0xffff_ffff, a separate enable switch
>   * is needed.
>   */
> 
> @@ -642,7 +642,7 @@ static void cxl_pmu_event_start(struct perf_event *event, int flags)
>                 if (cxl_pmu_config1_hdm_filter_en(event))
>                         cfg = cxl_pmu_config2_get_hdm_decoder(event);
>                 else
> -                       cfg = GENMASK(15, 0); /* No filtering if 0xFFFF_FFFF */
> +                       cfg = GENMASK(31, 0); /* No filtering if 0xFFFF_FFFF */
>                 writeq(cfg, base + CXL_PMU_FILTER_CFG_REG(hwc->idx, 0));
>         }
> 
> --
> 2.34.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH v2] perf: CXL: fix CPMU filter value mask length
  2024-02-15  8:09   ` Hojin Nam
@ 2024-02-15 11:44     ` Will Deacon
  -1 siblings, 0 replies; 6+ messages in thread
From: Will Deacon @ 2024-02-15 11:44 UTC (permalink / raw)
  To: Hojin Nam
  Cc: linux-cxl@vger.kernel.org, jonathan.cameron@huawei.com,
	Wonjae Lee, KyungSan Kim, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, mark.rutland@arm.com

Hi Hojin,

On Thu, Feb 15, 2024 at 05:09:06PM +0900, Hojin Nam wrote:
> CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
> However, it is used as 2B length in code and comments.
> 
> Signed-off-by: Hojin Nam <hj96.nam@samsung.com>
> ---
> 
> Hi Jonathan,
> as you said, I didn't actually hit this. I just found it by simply
> comparing the code to the CXL Spec. I removed Fixes tag and 
> repaired broken sign off, Thank you!
> 
> Changes since v1:
> - Remove Fixes tag (Jonathan)
> - Repair broken sign off (Jonathan)
> 
>  drivers/perf/cxl_pmu.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
> index 365d964b0f6a..ca5e92f28b4a 100644
> --- a/drivers/perf/cxl_pmu.c
> +++ b/drivers/perf/cxl_pmu.c
> @@ -59,7 +59,7 @@
>  #define   CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK     GENMASK_ULL(63, 59)
> 
>  #define CXL_PMU_FILTER_CFG_REG(n, f)   (0x400 + 4 * ((f) + (n) * 8))
> -#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(15, 0)
> +#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(31, 0)

Unfortunately, your patch appears to be whitespace-damaged (missing space,
tabs converted to space) so I'm not able to apply it :(

Will

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH v2] perf: CXL: fix CPMU filter value mask length
@ 2024-02-15 11:44     ` Will Deacon
  0 siblings, 0 replies; 6+ messages in thread
From: Will Deacon @ 2024-02-15 11:44 UTC (permalink / raw)
  To: Hojin Nam
  Cc: linux-cxl@vger.kernel.org, jonathan.cameron@huawei.com,
	Wonjae Lee, KyungSan Kim, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, mark.rutland@arm.com

Hi Hojin,

On Thu, Feb 15, 2024 at 05:09:06PM +0900, Hojin Nam wrote:
> CPMU filter value is described as 4B length in CXL r3.0 8.2.7.2.2.
> However, it is used as 2B length in code and comments.
> 
> Signed-off-by: Hojin Nam <hj96.nam@samsung.com>
> ---
> 
> Hi Jonathan,
> as you said, I didn't actually hit this. I just found it by simply
> comparing the code to the CXL Spec. I removed Fixes tag and 
> repaired broken sign off, Thank you!
> 
> Changes since v1:
> - Remove Fixes tag (Jonathan)
> - Repair broken sign off (Jonathan)
> 
>  drivers/perf/cxl_pmu.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
> index 365d964b0f6a..ca5e92f28b4a 100644
> --- a/drivers/perf/cxl_pmu.c
> +++ b/drivers/perf/cxl_pmu.c
> @@ -59,7 +59,7 @@
>  #define   CXL_PMU_COUNTER_CFG_EVENT_GRP_ID_IDX_MSK     GENMASK_ULL(63, 59)
> 
>  #define CXL_PMU_FILTER_CFG_REG(n, f)   (0x400 + 4 * ((f) + (n) * 8))
> -#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(15, 0)
> +#define   CXL_PMU_FILTER_CFG_VALUE_MSK                 GENMASK(31, 0)

Unfortunately, your patch appears to be whitespace-damaged (missing space,
tabs converted to space) so I'm not able to apply it :(

Will

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2024-02-15 11:45 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <CGME20240215080906epcms2p2c49c6b9bfe271e1d089ad35ab527b958@epcms2p2>
2024-02-15  8:09 ` [PATCH v2] perf: CXL: fix CPMU filter value mask length Hojin Nam
2024-02-15  8:09   ` Hojin Nam
2024-02-15  9:27   ` Jonathan Cameron
2024-02-15  9:27     ` Jonathan Cameron
2024-02-15 11:44   ` Will Deacon
2024-02-15 11:44     ` Will Deacon

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