Re: [PATCH v3 03/11] coresight: etm4x: Add missing API to set EL match on address filters

Mathieu Poirier
2019-10-17T19:26:15Z

On Thu, 17 Oct 2019 at 12:00, Mathieu Poirier
<mathieu.poirier@linaro.org> wrote:
>
> On Tue, Oct 15, 2019 at 10:19:56PM +0100, Mike Leach wrote:
> > TRCACATRn registers have match bits for secure and non-secure exception
> > levels which are not accessible by the sysfs API.
> > This adds a new sysfs parameter to enable this - addr_exlevel_s_ns.
> >
> > Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> > Signed-off-by: Mike Leach <mike.leach@linaro.org>
> > ---
> > .../coresight/coresight-etm4x-sysfs.c | 42 +++++++++++++++++++
> > 1 file changed, 42 insertions(+)
> >
> > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> > index cc8156318018..45fa7743eea4 100644
> > --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> > +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
> > @@ -1233,6 +1233,47 @@ static ssize_t addr_context_store(struct device *dev,
> > }
> > static DEVICE_ATTR_RW(addr_context);
> >
> > +static ssize_t addr_exlevel_s_ns_show(struct device *dev,
> > + struct device_attribute *attr,
> > + char *buf)
> > +{
> > + u8 idx;
> > + unsigned long val;
> > + struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
> > + struct etmv4_config *config = &drvdata->config;
> > +
> > + spin_lock(&drvdata->spinlock);
> > + idx = config->addr_idx;
> > + val = BMVAL(config->addr_acc[idx], 14, 8);
> > + spin_unlock(&drvdata->spinlock);
> > + return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
> > +}
> > +
> > +static ssize_t addr_exlevel_s_ns_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);
> > + struct etmv4_config *config = &drvdata->config;
> > +
> > + if (kstrtoul(buf, 0, &val))
> > + return -EINVAL;
> > +
> > + if (val & ~((GENMASK(14, 8) >> 8))
>
> This patch isn't compiling for me. A parenthesis is missing to close the if().

I will fix it because:

1) I've reviewed this patch several times already.
2) The solution is trivial.
3) I want to pickup patch 04/11 and there is a dependency with this one.

>
>
> > + return -EINVAL;
> > +
> > + spin_lock(&drvdata->spinlock);
> > + idx = config->addr_idx;
> > + /* clear Exlevel_ns & Exlevel_s bits[14:12, 11:8], bit[15] is res0 */
> > + config->addr_acc[idx] &= ~(GENMASK(14, 8));
> > + config->addr_acc[idx] |= (val << 8);
> > + spin_unlock(&drvdata->spinlock);
> > + return size;
> > +}
> > +static DEVICE_ATTR_RW(addr_exlevel_s_ns);
> > +
> > static ssize_t seq_idx_show(struct device *dev,
> > struct device_attribute *attr,
> > char *buf)
> > @@ -2038,6 +2079,7 @@ static struct attribute *coresight_etmv4_attrs[] = {
> > &dev_attr_addr_stop.attr,
> > &dev_attr_addr_ctxtype.attr,
> > &dev_attr_addr_context.attr,
> > + &dev_attr_addr_exlevel_s_ns.attr,
> > &dev_attr_seq_idx.attr,
> > &dev_attr_seq_state.attr,
> > &dev_attr_seq_event.attr,
> > --
> > 2.17.1
> >