Messages in this thread Patch in this message | | | From | Jolly Shah <> | Subject | [PATCH v3 24/24] firmware: xilinx: Add sysfs and API to set boot health status | Date | Fri, 6 Mar 2020 15:47:32 -0800 |
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From: Rajan Vaja <rajan.vaja@xilinx.com>
Add sysfs interface to set boot health status from user space. Add API used by this interface to communicate with firmware.
If PMUFW is compiled with CHECK_HEALTHY_BOOT, it will check the healthy bit on FPD WDT expiration. If healthy bit is set by a user application running in Linux, PMUFW will do APU only restart. If healthy bit is not set during FPD WDT expiration, PMUFW will do system restart.
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Jolly Shah <jollys@xilinx.com> Signed-off-by: Tejas Patel <tejas.patel@xilinx.com> Signed-off-by: Jolly Shah <jolly.shah@xilinx.com> --- .../ABI/stable/sysfs-driver-firmware-zynqmp | 21 ++++++++ drivers/firmware/xilinx/zynqmp.c | 63 ++++++++++++++++++++++ include/linux/firmware/xlnx-zynqmp.h | 3 ++ 3 files changed, 87 insertions(+)
diff --git a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp index b46ec0c..a37b408 100644 --- a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp +++ b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp @@ -80,3 +80,24 @@ Description: # echo "subsystem" > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope Users: Xilinx + +What: /sys/devices/platform/firmware\:zynqmp-firmware/health_status +Date: March 2020 +KernelVersion: 5.6 +Contact: "Jolly Shah" <jollys@xilinx.com> +Description: + This sysfs interface allows to set the health status. If PMUFW + is compiled with CHECK_HEALTHY_BOOT, it will check the healthy + bit on FPD WDT expiration. If healthy bit is set by a user + application running in Linux, PMUFW will do APU only restart. If + healthy bit is not set during FPD WDT expiration, PMUFW will do + system restart. + + Usage: + Set healthy bit + # echo 1 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status + + Unset healthy bit + # echo 0 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status + +Users: Xilinx diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c index 9caf1cf..fc3aa4e 100644 --- a/drivers/firmware/xilinx/zynqmp.c +++ b/drivers/firmware/xilinx/zynqmp.c @@ -667,6 +667,21 @@ int zynqmp_pm_read_pggs(u32 index, u32 *value) EXPORT_SYMBOL_GPL(zynqmp_pm_read_pggs); /** + * zynqmp_pm_set_boot_health_status() - PM API for setting healthy boot status + * @value Status value to be written + * + * This function sets healthy bit value to indicate boot health status + * to firmware. + * + * @return Returns status, either success or error+reason + */ +int zynqmp_pm_set_boot_health_status(u32 value) +{ + return zynqmp_pm_invoke_fn(PM_IOCTL, 0, IOCTL_SET_BOOT_HEALTH_STATUS, + value, 0, NULL); +} + +/** * zynqmp_pm_reset_assert - Request setting of reset (1 - assert, 0 - release) * @reset: Reset to be configured * @assert_flag: Flag stating should reset be asserted (1) or @@ -995,6 +1010,53 @@ static const struct attribute_group shutdown_scope_attribute_group = { }; /** + * health_status_store - Store health_status sysfs attribute + * @device: Device structure + * @attr: Device attribute structure + * @buf: User entered health_status attribute string + * @count: Buffer size + * + * User-space interface for setting the boot health status. + * Usage: echo <value> > /sys/devices/platform/firmware\:zynqmp-firmware/health_status + * + * Value: + * 1 - Set healthy bit to 1 + * 0 - Unset healthy bit + * + * Return: count argument if request succeeds, the corresponding error + * code otherwise + */ +static ssize_t health_status_store(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + unsigned int value; + + ret = kstrtouint(buf, 10, &value); + if (ret) + return ret; + + ret = zynqmp_pm_set_boot_health_status(value); + if (ret) { + pr_err("unable to set healthy bit value to %u\n", value); + return ret; + } + + return count; +} + +static DEVICE_ATTR_WO(health_status); + +static struct attribute *zynqmp_health_status_attrs[] = { + &dev_attr_health_status.attr, + NULL, +}; +static const struct attribute_group health_status_attribute_group = { + .attrs = zynqmp_health_status_attrs, +}; + +/** * ggs_show - Show global general storage (ggs) sysfs attribute * @device: Device structure * @attr: Device attribute structure @@ -1307,6 +1369,7 @@ static const struct attribute_group ggs_attribute_group = { const struct attribute_group *firmware_attribute_groups[] = { &ggs_attribute_group, &shutdown_scope_attribute_group, + &health_status_attribute_group, NULL, }; diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h index 31ed58c..1900349 100644 --- a/include/linux/firmware/xlnx-zynqmp.h +++ b/include/linux/firmware/xlnx-zynqmp.h @@ -114,6 +114,8 @@ enum pm_ioctl_id { IOCTL_READ_GGS, IOCTL_WRITE_PGGS, IOCTL_READ_PGGS, + /* Set healthy bit value */ + IOCTL_SET_BOOT_HEALTH_STATUS = 17, }; enum pm_query_id { @@ -341,6 +343,7 @@ int zynqmp_pm_read_ggs(u32 index, u32 *value); int zynqmp_pm_write_pggs(u32 index, u32 value); int zynqmp_pm_read_pggs(u32 index, u32 *value); int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype); +int zynqmp_pm_set_boot_health_status(u32 value); int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1, u32 arg2, u32 arg3, u32 *ret_payload); -- 2.7.4
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