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Coresight: ETMv4: Prevent TRCRSCTLR0&1 from being accessed

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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>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunyan Zhang 2015-10-07 09:26:38 -06:00 committed by Greg Kroah-Hartman
parent c39b7eef7d
commit 497b59565b
1 changed files with 16 additions and 6 deletions
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22
drivers/hwtracing/coresight/coresight-etm4x.c
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@ -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 * 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 * 2; i++)
drvdata->res_ctrl[i] = 0x0;
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
@ -1732,7 +1735,7 @@ 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 * 2)
return -EINVAL;
/*
@ -2416,8 +2419,13 @@ static void etm4_init_arch_data(void *info)
drvdata->nr_addr_cmp = BMVAL(etmidr4, 0, 3);
/* NUMPC, bits[15:12] number of PE comparator inputs for tracing */
drvdata->nr_pe_cmp = BMVAL(etmidr4, 12, 15);
/* NUMRSPAIR, bits[19:16] the number of resource pairs for tracing */
drvdata->nr_resource = BMVAL(etmidr4, 16, 19);
/*
* NUMRSPAIR, bits[19:16]
* The number of resource pairs conveyed by the HW starts at 0, i.e a
* value of 0x0 indicate 1 resource pair, 0x1 indicate two and so on.
* As such add 1 to the value of NUMRSPAIR for a better representation.
*/
drvdata->nr_resource = BMVAL(etmidr4, 16, 19) + 1;
/*
* NUMSSCC, bits[23:20] the number of single-shot
* comparator control for tracing
@ -2504,6 +2512,8 @@ static void etm4_init_default_data(struct etmv4_drvdata *drvdata)
drvdata->cntr_val[i] = 0x0;
}
/* Resource selector pair 0 is always implemented and reserved */
drvdata->res_idx = 0x2;
for (i = 2; i < drvdata->nr_resource * 2; i++)
drvdata->res_ctrl[i] = 0x0;