[PATCH 03/11] coresight-etm4x: Controls pertaining to the reset, mode, pe and events
Mathieu Poirier
mathieu.poirier at linaro.org
Wed Apr 22 15:40:43 PDT 2015
From: Pratik Patel <pratikp at codeaurora.org>
Adding sysfs entries to:
. set the tracing entity with default values.
. set various mode associated to the tracing entity.
. select the processing entity the tracing entity relates to.
. select various events of interest.
Signed-off-by: Pratik Patel <pratikp at codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier at linaro.org>
---
.../ABI/testing/sysfs-bus-coresight-devices-etm4x | 33 ++
drivers/hwtracing/coresight/coresight-etm4x.c | 442 ++++++++++++++++++++-
2 files changed, 474 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
index 0f579eb24631..9caf70382088 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
@@ -87,3 +87,36 @@ KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier at linaro.org>
Description: (R) Indicates the number of single-shot comparator controls that
are available for tracing.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/reset
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier at linaro.org>
+Description: (W) Cancels all configuration on a trace unit and set it back
+ to its boot configuration.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/mode
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier at linaro.org>
+Description: (RW) Controls various modes supported by this ETM, for example
+ P0 instruction tracing, branch broadcast, cycle counting and
+ context ID tracing.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/pe
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier at linaro.org>
+Description: (RW) Controls which PE to trace.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/event
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier at linaro.org>
+Description: (RW) Controls the tracing of arbitrary events from bank 0 to 3.
+
+What: /sys/bus/coresight/devices/<memory_map>.etm/event_instren
+Date: April 2015
+KernelVersion: 4.01
+Contact: Mathieu Poirier <mathieu.poirier at linaro.org>
+Description: (RW) Controls the behavior of the events in bank 0 to 3.
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 0975414b72c7..73408c296699 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -268,6 +268,46 @@ static const struct coresight_ops etm4_cs_ops = {
.source_ops = &etm4_source_ops,
};
+static int etm4_set_mode_exclude(struct etmv4_drvdata *drvdata, bool exclude)
+{
+ u8 idx = drvdata->addr_idx;
+
+ /*
+ * TRCACATRn.TYPE bit[1:0]: type of comparison
+ * the trace unit performs
+ */
+ if (BMVAL(drvdata->addr_acc[idx], 0, 1) == ETM_INSTR_ADDR) {
+ if (idx % 2 != 0)
+ return -EINVAL;
+
+ /*
+ * We are performing instruction address comparison. Set the
+ * relevant bit of ViewInst Include/Exclude Control register
+ * for corresponding address comparator pair.
+ */
+ if (drvdata->addr_type[idx] != ETM_ADDR_TYPE_RANGE ||
+ drvdata->addr_type[idx + 1] != ETM_ADDR_TYPE_RANGE)
+ return -EINVAL;
+
+ if (exclude == true) {
+ /*
+ * Set exclude bit and unset the include bit
+ * corresponding to comparator pair
+ */
+ drvdata->viiectlr |= BIT(idx / 2 + 16);
+ drvdata->viiectlr &= ~BIT(idx / 2);
+ } else {
+ /*
+ * Set include bit and unset exclude bit
+ * corresponding to comparator pair
+ */
+ drvdata->viiectlr |= BIT(idx / 2);
+ drvdata->viiectlr &= ~BIT(idx / 2 + 16);
+ }
+ }
+ return 0;
+}
+
static ssize_t nr_pe_cmp_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -376,6 +416,402 @@ static ssize_t nr_ss_cmp_show(struct device *dev,
}
static DEVICE_ATTR_RO(nr_ss_cmp);
+static ssize_t reset_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ int i;
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ if (kstrtoul(buf, 16, &val))
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ if (val)
+ drvdata->mode = 0x0;
+
+ /* Disable data tracing: do not trace load and store data transfers */
+ drvdata->mode &= ~(ETM_MODE_LOAD | ETM_MODE_STORE);
+ drvdata->cfg &= ~(BIT(1) | BIT(2));
+
+ /* Disable data value and data address tracing */
+ drvdata->mode &= ~(ETM_MODE_DATA_TRACE_ADDR |
+ ETM_MODE_DATA_TRACE_VAL);
+ drvdata->cfg &= ~(BIT(16) | BIT(17));
+
+ /* Disable all events tracing */
+ drvdata->eventctrl0 = 0x0;
+ drvdata->eventctrl1 = 0x0;
+
+ /* Disable timestamp event */
+ drvdata->ts_ctrl = 0x0;
+
+ /* Disable stalling */
+ drvdata->stall_ctrl = 0x0;
+
+ /* Reset trace synchronization period to 2^8 = 256 bytes*/
+ if (drvdata->syncpr == false)
+ drvdata->syncfreq = 0x8;
+
+ /*
+ * Enable ViewInst to trace everything with start-stop logic in
+ * started state. ARM recommends start-stop logic is set before
+ * each trace run.
+ */
+ drvdata->vinst_ctrl |= BIT(0);
+ if (drvdata->nr_addr_cmp == true) {
+ drvdata->mode |= ETM_MODE_VIEWINST_STARTSTOP;
+ /* SSSTATUS, bit[9] */
+ drvdata->vinst_ctrl |= BIT(9);
+ }
+
+ /* No address range filtering for ViewInst */
+ drvdata->viiectlr = 0x0;
+
+ /* No start-stop filtering for ViewInst */
+ drvdata->vissctlr = 0x0;
+
+ /* Disable seq events */
+ for (i = 0; i < drvdata->nrseqstate-1; i++)
+ drvdata->seq_ctrl[i] = 0x0;
+ drvdata->seq_rst = 0x0;
+ drvdata->seq_state = 0x0;
+
+ /* Disable external input events */
+ drvdata->ext_inp = 0x0;
+
+ drvdata->cntr_idx = 0x0;
+ for (i = 0; i < drvdata->nr_cntr; i++) {
+ drvdata->cntrldvr[i] = 0x0;
+ drvdata->cntr_ctrl[i] = 0x0;
+ drvdata->cntr_val[i] = 0x0;
+ }
+
+ drvdata->res_idx = 0x0;
+ for (i = 0; i < drvdata->nr_resource; i++)
+ drvdata->res_ctrl[i] = 0x0;
+
+ for (i = 0; i < drvdata->nr_ss_cmp; i++) {
+ drvdata->ss_ctrl[i] = 0x0;
+ drvdata->ss_pe_cmp[i] = 0x0;
+ }
+
+ drvdata->addr_idx = 0x0;
+ for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) {
+ drvdata->addr_val[i] = 0x0;
+ drvdata->addr_acc[i] = 0x0;
+ drvdata->addr_type[i] = ETM_ADDR_TYPE_NONE;
+ }
+
+ drvdata->ctxid_idx = 0x0;
+ for (i = 0; i < drvdata->numcidc; i++)
+ drvdata->ctxid_val[i] = 0x0;
+ drvdata->ctxid_mask0 = 0x0;
+ drvdata->ctxid_mask1 = 0x0;
+
+ drvdata->vmid_idx = 0x0;
+ for (i = 0; i < drvdata->numvmidc; i++)
+ drvdata->vmid_val[i] = 0x0;
+ drvdata->vmid_mask0 = 0x0;
+ drvdata->vmid_mask1 = 0x0;
+
+ drvdata->trcid = drvdata->cpu + 1;
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_WO(reset);
+
+static ssize_t mode_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ val = drvdata->mode;
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ unsigned long val, mode;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ if (kstrtoul(buf, 16, &val))
+ return -EINVAL;
+
+ spin_lock(&drvdata->spinlock);
+ drvdata->mode = val & ETMv4_MODE_ALL;
+
+ if (drvdata->mode & ETM_MODE_EXCLUDE)
+ etm4_set_mode_exclude(drvdata, true);
+ else
+ etm4_set_mode_exclude(drvdata, false);
+
+ if (drvdata->instrp0 == true) {
+ /* start by clearing instruction P0 field */
+ drvdata->cfg &= ~(BIT(1) | BIT(2));
+ if (drvdata->mode & ETM_MODE_LOAD)
+ /* 0b01 Trace load instructions as P0 instructions */
+ drvdata->cfg |= BIT(1);
+ if (drvdata->mode & ETM_MODE_STORE)
+ /* 0b10 Trace store instructions as P0 instructions */
+ drvdata->cfg |= BIT(2);
+ if (drvdata->mode & ETM_MODE_LOAD_STORE)
+ /*
+ * 0b11 Trace load and store instructions
+ * as P0 instructions
+ */
+ drvdata->cfg |= BIT(1) | BIT(2);
+ }
+
+ /* bit[3], Branch broadcast mode */
+ if ((drvdata->mode & ETM_MODE_BB) && (drvdata->trcbb == true))
+ drvdata->cfg |= BIT(3);
+ else
+ drvdata->cfg &= ~BIT(3);
+
+ /* bit[4], Cycle counting instruction trace bit */
+ if ((drvdata->mode & ETMv4_MODE_CYCACC) &&
+ (drvdata->trccci == true))
+ drvdata->cfg |= BIT(4);
+ else
+ drvdata->cfg &= ~BIT(4);
+
+ /* bit[6], Context ID tracing bit */
+ if ((drvdata->mode & ETMv4_MODE_CTXID) && (drvdata->ctxid_size))
+ drvdata->cfg |= BIT(6);
+ else
+ drvdata->cfg &= ~BIT(6);
+
+ if ((drvdata->mode & ETM_MODE_VMID) && (drvdata->vmid_size))
+ drvdata->cfg |= BIT(7);
+ else
+ drvdata->cfg &= ~BIT(7);
+
+ /* bits[10:8], Conditional instruction tracing bit */
+ mode = ETM_MODE_COND(drvdata->mode);
+ if (drvdata->trccond == true) {
+ drvdata->cfg &= ~(BIT(8) | BIT(9) | BIT(10));
+ drvdata->cfg |= mode << 8;
+ }
+
+ /* bit[11], Global timestamp tracing bit */
+ if ((drvdata->mode & ETMv4_MODE_TIMESTAMP) && (drvdata->ts_size))
+ drvdata->cfg |= BIT(11);
+ else
+ drvdata->cfg &= ~BIT(11);
+
+ /* bit[12], Return stack enable bit */
+ if ((drvdata->mode & ETM_MODE_RETURNSTACK) &&
+ (drvdata->retstack == true))
+ drvdata->cfg |= BIT(12);
+ else
+ drvdata->cfg &= ~BIT(12);
+
+ /* bits[14:13], Q element enable field */
+ mode = ETM_MODE_QELEM(drvdata->mode);
+ /* start by clearing QE bits */
+ drvdata->cfg &= ~(BIT(13) | BIT(14));
+ /* if supported, Q elements with instruction counts are enabled */
+ if ((mode & BIT(0)) && (drvdata->q_support & BIT(0)))
+ drvdata->cfg |= BIT(13);
+ /*
+ * if supported, Q elements with and without instruction
+ * counts are enabled
+ */
+ if ((mode & BIT(1)) && (drvdata->q_support & BIT(1)))
+ drvdata->cfg |= BIT(14);
+
+ /* bit[11], AMBA Trace Bus (ATB) trigger enable bit */
+ if ((drvdata->mode & ETM_MODE_ATB_TRIGGER) &&
+ (drvdata->atbtrig == true))
+ drvdata->eventctrl1 |= BIT(11);
+ else
+ drvdata->eventctrl1 &= ~BIT(11);
+
+ /* bit[12], Low-power state behavior override bit */
+ if ((drvdata->mode & ETM_MODE_LPOVERRIDE) &&
+ (drvdata->lpoverride == true))
+ drvdata->eventctrl1 |= BIT(12);
+ else
+ drvdata->eventctrl1 &= ~BIT(12);
+
+ /* bit[8], Instruction stall bit */
+ if (drvdata->mode & ETM_MODE_ISTALL_EN)
+ drvdata->stall_ctrl |= BIT(8);
+ else
+ drvdata->stall_ctrl &= ~BIT(8);
+
+ /* bit[10], Prioritize instruction trace bit */
+ if (drvdata->mode & ETM_MODE_INSTPRIO)
+ drvdata->stall_ctrl |= BIT(10);
+ else
+ drvdata->stall_ctrl &= ~BIT(10);
+
+ /* bit[13], Trace overflow prevention bit */
+ if ((drvdata->mode & ETM_MODE_NOOVERFLOW) &&
+ (drvdata->nooverflow == true))
+ drvdata->stall_ctrl |= BIT(13);
+ else
+ drvdata->stall_ctrl &= ~BIT(13);
+
+ /* bit[9] Start/stop logic control bit */
+ if (drvdata->mode & ETM_MODE_VIEWINST_STARTSTOP)
+ drvdata->vinst_ctrl |= BIT(9);
+ else
+ drvdata->vinst_ctrl &= ~BIT(9);
+
+ /* bit[10], Whether a trace unit must trace a Reset exception */
+ if (drvdata->mode & ETM_MODE_TRACE_RESET)
+ drvdata->vinst_ctrl |= BIT(10);
+ else
+ drvdata->vinst_ctrl &= ~BIT(10);
+
+ /* bit[11], Whether a trace unit must trace a system error exception */
+ if ((drvdata->mode & ETM_MODE_TRACE_ERR) &&
+ (drvdata->trc_error == true))
+ drvdata->vinst_ctrl |= BIT(11);
+ else
+ drvdata->vinst_ctrl &= ~BIT(11);
+
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(mode);
+
+static ssize_t pe_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ val = drvdata->pe_sel;
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t pe_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;
+
+ spin_lock(&drvdata->spinlock);
+ if (val > drvdata->nr_pe) {
+ spin_unlock(&drvdata->spinlock);
+ return -EINVAL;
+ }
+
+ drvdata->pe_sel = val;
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(pe);
+
+static ssize_t event_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ val = drvdata->eventctrl0;
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t event_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;
+
+ spin_lock(&drvdata->spinlock);
+ switch (drvdata->nr_event) {
+ case 0x0:
+ /* EVENT0, bits[7:0] */
+ drvdata->eventctrl0 = val & 0xFF;
+ break;
+ case 0x1:
+ /* EVENT1, bits[15:8] */
+ drvdata->eventctrl0 = val & 0xFFFF;
+ break;
+ case 0x2:
+ /* EVENT2, bits[23:16] */
+ drvdata->eventctrl0 = val & 0xFFFFFF;
+ break;
+ case 0x3:
+ /* EVENT3, bits[31:24] */
+ drvdata->eventctrl0 = val;
+ break;
+ default:
+ break;
+ }
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(event);
+
+static ssize_t event_instren_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ unsigned long val;
+ struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ val = BMVAL(drvdata->eventctrl1, 0, 3);
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+
+static ssize_t event_instren_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;
+
+ spin_lock(&drvdata->spinlock);
+ /* start by clearing all instruction event enable bits */
+ drvdata->eventctrl1 &= ~(BIT(0) | BIT(1) | BIT(2) | BIT(3));
+ switch (drvdata->nr_event) {
+ case 0x0:
+ /* generate Event element for event 1 */
+ drvdata->eventctrl1 |= val & BIT(1);
+ break;
+ case 0x1:
+ /* generate Event element for event 1 and 2 */
+ drvdata->eventctrl1 |= val & (BIT(0) | BIT(1));
+ break;
+ case 0x2:
+ /* generate Event element for event 1, 2 and 3 */
+ drvdata->eventctrl1 |= val & (BIT(0) | BIT(1) | BIT(2));
+ break;
+ case 0x3:
+ /* generate Event element for all 4 events */
+ drvdata->eventctrl1 |= val & 0xF;
+ break;
+ default:
+ break;
+ }
+ spin_unlock(&drvdata->spinlock);
+ return size;
+}
+static DEVICE_ATTR_RW(event_instren);
+
static ssize_t status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -518,7 +954,6 @@ static ssize_t trcidr_show(struct device *dev,
return ret;
}
static DEVICE_ATTR_RO(trcidr);
-
static struct attribute *coresight_etmv4_attrs[] = {
&dev_attr_nr_pe_cmp.attr,
&dev_attr_nr_addr_cmp.attr,
@@ -529,6 +964,11 @@ static struct attribute *coresight_etmv4_attrs[] = {
&dev_attr_nrseqstate.attr,
&dev_attr_nr_resource.attr,
&dev_attr_nr_ss_cmp.attr,
+ &dev_attr_reset.attr,
+ &dev_attr_mode.attr,
+ &dev_attr_pe.attr,
+ &dev_attr_event.attr,
+ &dev_attr_event_instren.attr,
&dev_attr_status.attr,
&dev_attr_mgmt.attr,
&dev_attr_trcidr.attr,
--
1.9.1
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