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author | Pratik Patel <pratikp@codeaurora.org> | 2015-05-13 10:34:17 -0600 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 11:11:21 -0700 |
commit | 6afa8a1387aa4af73e8c3b81019d958ef8a2a4d0 (patch) | |
tree | 7405bb13d8e6886afb30467365cadc29257e926e /drivers/hwtracing/coresight | |
parent | add2d5d0d15fe391e42b8b220590ed02ba0aad16 (diff) | |
download | op-kernel-dev-6afa8a1387aa4af73e8c3b81019d958ef8a2a4d0.zip op-kernel-dev-6afa8a1387aa4af73e8c3b81019d958ef8a2a4d0.tar.gz |
coresight-etm4x: Controls pertaining to the selection of resources
Adding sysfs entries to control the selection of the resources the
trace unit will use as triggers to perform a trace run.
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 2c394e4..308a48d 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -1707,6 +1707,79 @@ static ssize_t cntr_ctrl_store(struct device *dev, } static DEVICE_ATTR_RW(cntr_ctrl); +static ssize_t res_idx_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + unsigned long val; + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); + + val = drvdata->res_idx; + return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); +} + +static ssize_t res_idx_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + unsigned long val; + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); + + if (kstrtoul(buf, 16, &val)) + return -EINVAL; + /* Resource selector pair 0 is always implemented and reserved */ + if ((val == 0) || (val >= drvdata->nr_resource)) + return -EINVAL; + + /* + * Use spinlock to ensure index doesn't change while it gets + * dereferenced multiple times within a spinlock block elsewhere. + */ + spin_lock(&drvdata->spinlock); + drvdata->res_idx = val; + spin_unlock(&drvdata->spinlock); + return size; +} +static DEVICE_ATTR_RW(res_idx); + +static ssize_t res_ctrl_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + u8 idx; + unsigned long val; + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); + + spin_lock(&drvdata->spinlock); + idx = drvdata->res_idx; + val = drvdata->res_ctrl[idx]; + spin_unlock(&drvdata->spinlock); + return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); +} + +static ssize_t res_ctrl_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + u8 idx; + unsigned long val; + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent); + + if (kstrtoul(buf, 16, &val)) + return -EINVAL; + + spin_lock(&drvdata->spinlock); + idx = drvdata->res_idx; + /* For odd idx pair inversal bit is RES0 */ + if (idx % 2 != 0) + /* PAIRINV, bit[21] */ + val &= ~BIT(21); + drvdata->res_ctrl[idx] = val; + spin_unlock(&drvdata->spinlock); + return size; +} +static DEVICE_ATTR_RW(res_ctrl); + static ssize_t cpu_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1757,6 +1830,8 @@ static struct attribute *coresight_etmv4_attrs[] = { &dev_attr_cntrldvr.attr, &dev_attr_cntr_val.attr, &dev_attr_cntr_ctrl.attr, + &dev_attr_res_idx.attr, + &dev_attr_res_ctrl.attr, &dev_attr_cpu.attr, NULL, }; |