Having access to the ETMv4 management registers is very useful as they give meaningful information on how the IP block has been configured at synthesis time.
Signed-off-by: Mathieu Poirier <[email protected]> --- .../ABI/testing/sysfs-bus-coresight-devices-etm4x | 77 ++++++++++++++++++++++ drivers/hwtracing/coresight/coresight-etm4x.c | 53 ++++++++++++++- 2 files changed, 129 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x index 648f28ded226..bde788dfd3f7 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x @@ -281,3 +281,80 @@ KernelVersion: 4.01 Contact: Mathieu Poirier <[email protected]> Description: (RW) Mask for all 8 virtual machine ID comparator value registers (if implemented). + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcoslsr +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the OS Lock Status Register (0x304). + The value it taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdcr +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Power Down Control Register + (0x310). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdsr +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Power Down Status Register + (0x314). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trclsr +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the SW Lock Status Register + (0xFB4). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcauthstatus +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Authentication Status Register + (0xFB8). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevid +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Device ID Register + (0xFC8). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevtype +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Device Type Register + (0xFCC). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr0 +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Peripheral ID0 Register + (0xFE0). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr1 +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Peripheral ID1 Register + (0xFE4). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr2 +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Peripheral ID2 Register + (0xFE8). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr3 +Date: April 2015 +KernelVersion: 4.01 +Contact: Mathieu Poirier <[email protected]> +Description: (R) Print the content of the Peripheral ID3 Register + (0xFEC). The value is taken directly from the HW. diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 02ee6fc97ddf..0568e4413411 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -2200,7 +2200,58 @@ static struct attribute *coresight_etmv4_attrs[] = { &dev_attr_cpu.attr, NULL, }; -ATTRIBUTE_GROUPS(coresight_etmv4); + +#define coresight_simple_func(name, offset) \ +static ssize_t name##_show(struct device *_dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct etmv4_drvdata *drvdata = dev_get_drvdata(_dev->parent); \ + return scnprintf(buf, PAGE_SIZE, "0x%x\n", \ + readl_relaxed(drvdata->base + offset)); \ +} \ +DEVICE_ATTR_RO(name) + +coresight_simple_func(trcoslsr, TRCOSLSR); +coresight_simple_func(trcpdcr, TRCPDCR); +coresight_simple_func(trcpdsr, TRCPDSR); +coresight_simple_func(trclsr, TRCLSR); +coresight_simple_func(trcauthstatus, TRCAUTHSTATUS); +coresight_simple_func(trcdevid, TRCDEVID); +coresight_simple_func(trcdevtype, TRCDEVTYPE); +coresight_simple_func(trcpidr0, TRCPIDR0); +coresight_simple_func(trcpidr1, TRCPIDR1); +coresight_simple_func(trcpidr2, TRCPIDR2); +coresight_simple_func(trcpidr3, TRCPIDR3); + +static struct attribute *coresight_etmv4_mgmt_attrs[] = { + &dev_attr_trcoslsr.attr, + &dev_attr_trcpdcr.attr, + &dev_attr_trcpdsr.attr, + &dev_attr_trclsr.attr, + &dev_attr_trcauthstatus.attr, + &dev_attr_trcdevid.attr, + &dev_attr_trcdevtype.attr, + &dev_attr_trcpidr0.attr, + &dev_attr_trcpidr1.attr, + &dev_attr_trcpidr2.attr, + &dev_attr_trcpidr3.attr, + NULL, +}; + +static const struct attribute_group coresight_etmv4_group = { + .attrs = coresight_etmv4_attrs, +}; + +static const struct attribute_group coresight_etmv4_mgmt_group = { + .attrs = coresight_etmv4_mgmt_attrs, + .name = "mgmt", +}; + +static const struct attribute_group *coresight_etmv4_groups[] = { + &coresight_etmv4_group, + &coresight_etmv4_mgmt_group, + NULL, +}; static void etm4_init_arch_data(void *info) { -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
