diff mbox

Coresight: ETMv4: Prevent TRCRSCTLR0&1 from being accessed

Message ID 1440648369-4614-1-git-send-email-zhang.chunyan@linaro.org
State Superseded
Headers show

Commit Message

Chunyan Zhang Aug. 27, 2015, 4:06 a.m. UTC
1. TRCRSCTLRn - Resource Selection Control Registers n=0~1 are reserved,
   we shouldn't access them.
2. The max number of 'n' here is defined in TRCIDR4.NUMRSPAIR whoes value
   indicates the number of resource selection *pairs*, and 0 indicates
   one resource selection pair, 1 indicates two pairs, and so on ...

So, the total number of resource selection control registers which we can
access is (TRCIDR4.NUMRSPAIR * 2)

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

Comments

Mathieu Poirier Aug. 27, 2015, 3:05 p.m. UTC | #1
On 26 August 2015 at 22:06, Chunyan Zhang <zhang.chunyan@linaro.org> wrote:
> 1. TRCRSCTLRn - Resource Selection Control Registers n=0~1 are reserved,
>    we shouldn't access them.
> 2. The max number of 'n' here is defined in TRCIDR4.NUMRSPAIR whoes value
>    indicates the number of resource selection *pairs*, and 0 indicates
>    one resource selection pair, 1 indicates two pairs, and so on ...
>
> So, the total number of resource selection control registers which we can
> access is (TRCIDR4.NUMRSPAIR * 2)
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
> ---
>  drivers/hwtracing/coresight/coresight-etm4x.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 1312e99..9425249 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -136,7 +136,9 @@ static void etm4_enable_hw(void *info)
>                 writel_relaxed(drvdata->cntr_val[i],
>                                drvdata->base + TRCCNTVRn(i));
>         }
> -       for (i = 0; i < drvdata->nr_resource; i++)
> +
> +       /* Resource selector pair 0 is always implemented and reserved */
> +       for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)

Instead of repeating "->nr_resource + 1) * 2" every time, please add
"->nr_resource += 1" in etm4_init_arch_data() along with a comment
that explains why.

>                 writel_relaxed(drvdata->res_ctrl[i],
>                                drvdata->base + TRCRSCTLRn(i));
>
> @@ -489,8 +491,9 @@ static ssize_t reset_store(struct device *dev,
>                 drvdata->cntr_val[i] = 0x0;
>         }
>
> -       drvdata->res_idx = 0x0;
> -       for (i = 0; i < drvdata->nr_resource; i++)
> +       /* Resource selector pair 0 is always implemented and reserved */
> +       drvdata->res_idx = 0x2;
> +       for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
>                 drvdata->res_ctrl[i] = 0x0;
>
>         for (i = 0; i < drvdata->nr_ss_cmp; i++) {
> @@ -1729,7 +1732,7 @@ static ssize_t res_idx_store(struct device *dev,
>         if (kstrtoul(buf, 16, &val))
>                 return -EINVAL;
>         /* Resource selector pair 0 is always implemented and reserved */
> -       if ((val == 0) || (val >= drvdata->nr_resource))
> +       if (val < 2 || val > (drvdata->nr_resource + 1) * 2)
>                 return -EINVAL;
>
>         /*
> @@ -2498,7 +2501,9 @@ static void etm4_init_default_data(struct etmv4_drvdata *drvdata)
>                 drvdata->cntr_val[i] = 0x0;
>         }
>
> -       for (i = 2; i < drvdata->nr_resource * 2; i++)
> +       /* Resource selector pair 0 is always implemented and reserved */
> +       drvdata->res_idx = 0x2;
> +       for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
>                 drvdata->res_ctrl[i] = 0x0;
>
>         for (i = 0; i < drvdata->nr_ss_cmp; i++) {
> --
> 1.9.1
>
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diff mbox

Patch

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 1312e99..9425249 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -136,7 +136,9 @@  static void etm4_enable_hw(void *info)
 		writel_relaxed(drvdata->cntr_val[i],
 			       drvdata->base + TRCCNTVRn(i));
 	}
-	for (i = 0; i < drvdata->nr_resource; i++)
+
+	/* Resource selector pair 0 is always implemented and reserved */
+	for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
 		writel_relaxed(drvdata->res_ctrl[i],
 			       drvdata->base + TRCRSCTLRn(i));
 
@@ -489,8 +491,9 @@  static ssize_t reset_store(struct device *dev,
 		drvdata->cntr_val[i] = 0x0;
 	}
 
-	drvdata->res_idx = 0x0;
-	for (i = 0; i < drvdata->nr_resource; i++)
+	/* Resource selector pair 0 is always implemented and reserved */
+	drvdata->res_idx = 0x2;
+	for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
 		drvdata->res_ctrl[i] = 0x0;
 
 	for (i = 0; i < drvdata->nr_ss_cmp; i++) {
@@ -1729,7 +1732,7 @@  static ssize_t res_idx_store(struct device *dev,
 	if (kstrtoul(buf, 16, &val))
 		return -EINVAL;
 	/* Resource selector pair 0 is always implemented and reserved */
-	if ((val == 0) || (val >= drvdata->nr_resource))
+	if (val < 2 || val > (drvdata->nr_resource + 1) * 2)
 		return -EINVAL;
 
 	/*
@@ -2498,7 +2501,9 @@  static void etm4_init_default_data(struct etmv4_drvdata *drvdata)
 		drvdata->cntr_val[i] = 0x0;
 	}
 
-	for (i = 2; i < drvdata->nr_resource * 2; i++)
+	/* Resource selector pair 0 is always implemented and reserved */
+	drvdata->res_idx = 0x2;
+	for (i = 2; i < (drvdata->nr_resource + 1) * 2; i++)
 		drvdata->res_ctrl[i] = 0x0;
 
 	for (i = 0; i < drvdata->nr_ss_cmp; i++) {