[PATCH v3 08/11] coresight: etm4x: Add missing single-shot control API to sysfs

Mike Leach
2019-10-15T21:23:12Z

An API to control single-shot comparator operation was missing from sysfs.
This adds the parameters to sysfs to allow programming of this feature.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
---
.../coresight/coresight-etm4x-sysfs.c | 122 ++++++++++++++++++
drivers/hwtracing/coresight/coresight-etm4x.c | 26 +++-
drivers/hwtracing/coresight/coresight-etm4x.h | 2 +
3 files changed, 149 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index ca1a54411225..43b3f0976034 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -239,6 +239,7 @@ static ssize_t reset_store(struct device *dev,
for (i = 0; i < drvdata->nr_resource; i++)
config->res_ctrl[i] = 0x0;

+ config->ss_idx = 0x0;
for (i = 0; i < drvdata->nr_ss_cmp; i++) {
config->ss_ctrl[i] = 0x0;
config->ss_pe_cmp[i] = 0x0;
@@ -1717,6 +1718,123 @@ static ssize_t res_ctrl_store(struct device *dev,
}
static DEVICE_ATTR_RW(res_ctrl);

+static ssize_t sshot_idx_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ struct etmv4_config *config = &drvdata->config;
+
+ val = config->ss_idx;
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t sshot_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);
+ struct etmv4_config *config = &drvdata->config;
+
+ if (kstrtoul(buf, 16, &val))
+ return -EINVAL;
+ if (val >= drvdata->nr_ss_cmp)
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ config->ss_idx = val;
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(sshot_idx);
+
+static ssize_t sshot_ctrl_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ struct etmv4_config *config = &drvdata->config;
+
+ spin_lock(&drvdata->spinlock);
+ val = config->ss_ctrl[config->ss_idx];
+ spin_unlock(&drvdata->spinlock);
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t sshot_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);
+ struct etmv4_config *config = &drvdata->config;
+
+ if (kstrtoul(buf, 16, &val))
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ idx = config->ss_idx;
+ config->ss_ctrl[idx] = val & GENMASK(24, 0);
+ /* must clear bit 31 in related status register on programming */
+ config->ss_status[idx] &= ~BIT(31);
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(sshot_ctrl);
+
+static ssize_t sshot_status_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ struct etmv4_config *config = &drvdata->config;
+
+ spin_lock(&drvdata->spinlock);
+ val = config->ss_status[config->ss_idx];
+ spin_unlock(&drvdata->spinlock);
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+static DEVICE_ATTR_RO(sshot_status);
+
+static ssize_t sshot_pe_ctrl_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+ struct etmv4_config *config = &drvdata->config;
+
+ spin_lock(&drvdata->spinlock);
+ val = config->ss_pe_cmp[config->ss_idx];
+ spin_unlock(&drvdata->spinlock);
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t sshot_pe_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);
+ struct etmv4_config *config = &drvdata->config;
+
+ if (kstrtoul(buf, 16, &val))
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ idx = config->ss_idx;
+ config->ss_pe_cmp[idx] = val & GENMASK(7, 0);
+ /* must clear bit 31 in related status register on programming */
+ config->ss_status[idx] &= ~BIT(31);
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(sshot_pe_ctrl);
+
static ssize_t ctxid_idx_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -2173,6 +2291,10 @@ static struct attribute *coresight_etmv4_attrs[] = {
&dev_attr_addr_exlevel_s_ns.attr,
&dev_attr_addr_cmp_view.attr,
&dev_attr_vinst_pe_cmp_start_stop.attr,
+ &dev_attr_sshot_idx.attr,
+ &dev_attr_sshot_ctrl.attr,
+ &dev_attr_sshot_pe_ctrl.attr,
+ &dev_attr_sshot_status.attr,
&dev_attr_seq_idx.attr,
&dev_attr_seq_state.attr,
&dev_attr_seq_event.attr,
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index d5148afdbe80..dc3f507e7562 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -168,6 +168,9 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
drvdata->base + TRCRSCTLRn(i));

for (i = 0; i < drvdata->nr_ss_cmp; i++) {
+ /* always clear status bit on restart if using single-shot */
+ if (config->ss_ctrl[i] || config->ss_pe_cmp[i])
+ config->ss_status[i] &= ~BIT(31);
writel_relaxed(config->ss_ctrl[i],
drvdata->base + TRCSSCCRn(i));
writel_relaxed(config->ss_status[i],
@@ -467,6 +470,9 @@ static void etm4_disable_hw(void *info)
{
u32 control;
struct etmv4_drvdata *drvdata = info;
+ struct etmv4_config *config = &drvdata->config;
+ struct device *etm_dev = &drvdata->csdev->dev;
+ int i;

CS_UNLOCK(drvdata->base);

@@ -489,6 +495,18 @@ static void etm4_disable_hw(void *info)
isb();
writel_relaxed(control, drvdata->base + TRCPRGCTLR);

+ /* wait for TRCSTATR.PMSTABLE to go to '1' */
+ if (coresight_timeout(drvdata->base, TRCSTATR,
+ TRCSTATR_PMSTABLE_BIT, 1))
+ dev_err(etm_dev,
+ "timeout while waiting for PM stable Trace Status\n");
+
+ /* read the status of the single shot comparators */
+ for (i = 0; i < drvdata->nr_ss_cmp; i++) {
+ config->ss_status[i] =
+ readl_relaxed(drvdata->base + TRCSSCSRn(i));
+ }
+
coresight_disclaim_device_unlocked(drvdata->base);

CS_LOCK(drvdata->base);
@@ -595,6 +613,7 @@ static void etm4_init_arch_data(void *info)
u32 etmidr4;
u32 etmidr5;
struct etmv4_drvdata *drvdata = info;
+ int i;

/* Make sure all registers are accessible */
etm4_os_unlock(drvdata);
@@ -718,9 +737,14 @@ static void etm4_init_arch_data(void *info)
drvdata->nr_resource = BMVAL(etmidr4, 16, 19) + 1;
/*
* NUMSSCC, bits[23:20] the number of single-shot
- * comparator control for tracing
+ * comparator control for tracing. Read any status regs as these
+ * also contain RO capability data.
*/
drvdata->nr_ss_cmp = BMVAL(etmidr4, 20, 23);
+ for (i = 0; i < drvdata->nr_ss_cmp; i++) {
+ drvdata->config.ss_status[i] =
+ readl_relaxed(drvdata->base + TRCSSCSRn(i));
+ }
/* NUMCIDC, bits[27:24] number of Context ID comparators for tracing */
drvdata->numcidc = BMVAL(etmidr4, 24, 27);
/* NUMVMIDC, bits[31:28] number of VMID comparators for tracing */
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index b873df38e7d8..4a695bf90582 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -227,6 +227,7 @@
* @cntr_val: Sets or returns the value for a counter.
* @res_idx: Resource index selector.
* @res_ctrl: Controls the selection of the resources in the trace unit.
+ * @ss_idx: Single-shot index selector.
* @ss_ctrl: Controls the corresponding single-shot comparator resource.
* @ss_status: The status of the corresponding single-shot comparator.
* @ss_pe_cmp: Selects the PE comparator inputs for Single-shot control.
@@ -270,6 +271,7 @@ struct etmv4_config {
u32 cntr_val[ETMv4_MAX_CNTR];
u8 res_idx;
u32 res_ctrl[ETM_MAX_RES_SEL];
+ u8 ss_idx;
u32 ss_ctrl[ETM_MAX_SS_CMP];
u32 ss_status[ETM_MAX_SS_CMP];
u32 ss_pe_cmp[ETM_MAX_SS_CMP];