coresight: tmc: adding sysFS management entries

Adding management registers that convey implementation
specific characteristics.  Those are useful for trace
configuration and collection along with general trouble
shooting.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 7d83d17795efce95def54a13ccd6c3f80de6e8f0)

diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
index f38cded5fa22cfefa4bd91521d36ebef89b581e7..4fe677ed1305c8ecaf4a4f0a68af1745a8d0ce02 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tmc
@@ -6,3 +6,80 @@ Description:   (RW) Disables write access to the Trace RAM by stopping the
                formatter after a defined number of words have been stored
                following the trigger event. Additional interface for this
                driver are expected to be added as it matures.
+
+What:           /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/rsz
+Date:           March 2016
+KernelVersion:  4.7
+Contact:        Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:    (R) Defines the size, in 32-bit words, of the local RAM buffer.
+                The value is read directly from HW register RSZ, 0x004.
+
+What:           /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/sts
+Date:           March 2016
+KernelVersion:  4.7
+Contact:        Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Shows the value held by the TMC status register.  The value
+                is read directly from HW register STS, 0x00C.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/rrp
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Shows the value held by the TMC RAM Read Pointer register
+               that is used to read entries from the Trace RAM over the APB
+               interface.  The value is read directly from HW register RRP,
+               0x014.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/rwp
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Shows the value held by the TMC RAM Write Pointer register
+               that is used to sets the write pointer to write entries from
+               the CoreSight bus into the Trace RAM. The value is read directly
+               from HW register RWP, 0x018.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/trg
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Similar to "trigger_cntr" above except that this value is
+               read directly from HW register TRG, 0x01C.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/ctl
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Shows the value held by the TMC Control register. The value
+               is read directly from HW register CTL, 0x020.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/ffsr
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Shows the value held by the TMC Formatter and Flush Status
+               register.  The value is read directly from HW register FFSR,
+               0x300.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/ffcr
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Shows the value held by the TMC Formatter and Flush Control
+               register.  The value is read directly from HW register FFCR,
+               0x304.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/mode
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Shows the value held by the TMC Mode register, which
+               indicate the mode the device has been configured to enact.  The
+               The value is read directly from the MODE register, 0x028.
+
+What:          /sys/bus/coresight/devices/<memory_map>.tmc/mgmt/devid
+Date:          March 2016
+KernelVersion: 4.7
+Contact:       Mathieu Poirier <mathieu.poirier@linaro.org>
+Description:   (R) Indicates the capabilities of the Coresight TMC.
+               The value is read directly from the DEVID register, 0xFC8,

diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 0a4db1ac52aee39ec8538a2b3e1c1ea0ecc43d3d..2b42ecbd88312c14b1f707ecaaf58951f798eae0 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -556,56 +556,38 @@ static const struct file_operations tmc_fops = {
        .llseek         = no_llseek,
 };
 
-static ssize_t status_show(struct device *dev,
-                          struct device_attribute *attr, char *buf)
-{
-       unsigned long flags;
-       u32 tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg;
-       u32 tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr;
-       u32 devid;
-       struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
-
-       pm_runtime_get_sync(drvdata->dev);
-       spin_lock_irqsave(&drvdata->spinlock, flags);
-       CS_UNLOCK(drvdata->base);
-
-       tmc_rsz = readl_relaxed(drvdata->base + TMC_RSZ);
-       tmc_sts = readl_relaxed(drvdata->base + TMC_STS);
-       tmc_rrp = readl_relaxed(drvdata->base + TMC_RRP);
-       tmc_rwp = readl_relaxed(drvdata->base + TMC_RWP);
-       tmc_trg = readl_relaxed(drvdata->base + TMC_TRG);
-       tmc_ctl = readl_relaxed(drvdata->base + TMC_CTL);
-       tmc_ffsr = readl_relaxed(drvdata->base + TMC_FFSR);
-       tmc_ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
-       tmc_mode = readl_relaxed(drvdata->base + TMC_MODE);
-       tmc_pscr = readl_relaxed(drvdata->base + TMC_PSCR);
-       devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
-
-       CS_LOCK(drvdata->base);
-       spin_unlock_irqrestore(&drvdata->spinlock, flags);
-       pm_runtime_put(drvdata->dev);
-
-       return sprintf(buf,
-                      "Depth:\t\t0x%x\n"
-                      "Status:\t\t0x%x\n"
-                      "RAM read ptr:\t0x%x\n"
-                      "RAM wrt ptr:\t0x%x\n"
-                      "Trigger cnt:\t0x%x\n"
-                      "Control:\t0x%x\n"
-                      "Flush status:\t0x%x\n"
-                      "Flush ctrl:\t0x%x\n"
-                      "Mode:\t\t0x%x\n"
-                      "PSRC:\t\t0x%x\n"
-                      "DEVID:\t\t0x%x\n",
-                       tmc_rsz, tmc_sts, tmc_rrp, tmc_rwp, tmc_trg,
-                       tmc_ctl, tmc_ffsr, tmc_ffcr, tmc_mode, tmc_pscr, devid);
-
-       return -EINVAL;
-}
-static DEVICE_ATTR_RO(status);
+#define coresight_tmc_simple_func(name, offset)                        \
+       coresight_simple_func(struct tmc_drvdata, name, offset)
+
+coresight_tmc_simple_func(rsz, TMC_RSZ);
+coresight_tmc_simple_func(sts, TMC_STS);
+coresight_tmc_simple_func(rrp, TMC_RRP);
+coresight_tmc_simple_func(rwp, TMC_RWP);
+coresight_tmc_simple_func(trg, TMC_TRG);
+coresight_tmc_simple_func(ctl, TMC_CTL);
+coresight_tmc_simple_func(ffsr, TMC_FFSR);
+coresight_tmc_simple_func(ffcr, TMC_FFCR);
+coresight_tmc_simple_func(mode, TMC_MODE);
+coresight_tmc_simple_func(pscr, TMC_PSCR);
+coresight_tmc_simple_func(devid, CORESIGHT_DEVID);
+
+static struct attribute *coresight_tmc_mgmt_attrs[] = {
+       &dev_attr_rsz.attr,
+       &dev_attr_sts.attr,
+       &dev_attr_rrp.attr,
+       &dev_attr_rwp.attr,
+       &dev_attr_trg.attr,
+       &dev_attr_ctl.attr,
+       &dev_attr_ffsr.attr,
+       &dev_attr_ffcr.attr,
+       &dev_attr_mode.attr,
+       &dev_attr_pscr.attr,
+       &dev_attr_devid.attr,
+       NULL,
+};
 
-static ssize_t trigger_cntr_show(struct device *dev,
-                           struct device_attribute *attr, char *buf)
+ssize_t trigger_cntr_show(struct device *dev,
+                         struct device_attribute *attr, char *buf)
 {
        struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
        unsigned long val = drvdata->trigger_cntr;
@@ -630,26 +612,25 @@ static ssize_t trigger_cntr_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(trigger_cntr);
 
-static struct attribute *coresight_etb_attrs[] = {
+static struct attribute *coresight_tmc_attrs[] = {
        &dev_attr_trigger_cntr.attr,
-       &dev_attr_status.attr,
        NULL,
 };
-ATTRIBUTE_GROUPS(coresight_etb);
 
-static struct attribute *coresight_etr_attrs[] = {
-       &dev_attr_trigger_cntr.attr,
-       &dev_attr_status.attr,
-       NULL,
+static const struct attribute_group coresight_tmc_group = {
+       .attrs = coresight_tmc_attrs,
 };
-ATTRIBUTE_GROUPS(coresight_etr);
 
-static struct attribute *coresight_etf_attrs[] = {
-       &dev_attr_trigger_cntr.attr,
-       &dev_attr_status.attr,
+static const struct attribute_group coresight_tmc_mgmt_group = {
+       .attrs = coresight_tmc_mgmt_attrs,
+       .name = "mgmt",
+};
+
+const struct attribute_group *coresight_tmc_groups[] = {
+       &coresight_tmc_group,
+       &coresight_tmc_mgmt_group,
        NULL,
 };
-ATTRIBUTE_GROUPS(coresight_etf);
 
 static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 {
@@ -725,20 +706,18 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
        desc->pdata = pdata;
        desc->dev = dev;
        desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
+       desc->groups = coresight_tmc_groups;
 
        if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
                desc->type = CORESIGHT_DEV_TYPE_SINK;
                desc->ops = &tmc_etb_cs_ops;
-               desc->groups = coresight_etb_groups;
        } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
                desc->type = CORESIGHT_DEV_TYPE_SINK;
                desc->ops = &tmc_etr_cs_ops;
-               desc->groups = coresight_etr_groups;
        } else {
                desc->type = CORESIGHT_DEV_TYPE_LINKSINK;
                desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
                desc->ops = &tmc_etf_cs_ops;
-               desc->groups = coresight_etf_groups;
        }
 
        drvdata->csdev = coresight_register(desc);