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Date: Thu, 9 Apr 2020 12:12:14 -0700 From: Jolly Shah <jolly.shah@...inx.com> To: ard.biesheuvel@...aro.org, mingo@...nel.org, gregkh@...uxfoundation.org, matt@...eblueprint.co.uk, sudeep.holla@....com, hkallweit1@...il.com, keescook@...omium.org, dmitry.torokhov@...il.com, michal.simek@...inx.com Cc: rajanv@...inx.com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Rajan Vaja <rajan.vaja@...inx.com>, Tejas Patel <tejas.patel@...inx.com>, Jolly Shah <jolly.shah@...inx.com> Subject: [PATCH v4 25/25] firmware: xilinx: Add sysfs and API to set boot health status From: Rajan Vaja <rajan.vaja@...inx.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@...inx.com> Signed-off-by: Michal Simek <michal.simek@...inx.com> Signed-off-by: Tejas Patel <tejas.patel@...inx.com> Signed-off-by: Jolly Shah <jolly.shah@...inx.com> --- .../ABI/stable/sysfs-driver-firmware-zynqmp | 21 ++++++++++++ drivers/firmware/xilinx/zynqmp.c | 39 ++++++++++++++++++++++ include/linux/firmware/xlnx-zynqmp.h | 7 ++++ 3 files changed, 67 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp index 554f30c..00fa04c 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@...inx.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 8d36618..bfaf29a 100644 --- a/drivers/firmware/xilinx/zynqmp.c +++ b/drivers/firmware/xilinx/zynqmp.c @@ -684,6 +684,21 @@ 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 @@ -984,6 +999,29 @@ static ssize_t shutdown_scope_store(struct device *device, static DEVICE_ATTR_RW(shutdown_scope); +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) { + dev_err(device, "unable to set healthy bit value to %u\n", + value); + return ret; + } + + return count; +} + +static DEVICE_ATTR_WO(health_status); + static ssize_t ggs_show(struct device *device, struct device_attribute *attr, char *buf, @@ -1143,6 +1181,7 @@ static struct attribute *zynqmp_firmware_attrs[] = { &dev_attr_pggs2.attr, &dev_attr_pggs3.attr, &dev_attr_shutdown_scope.attr, + &dev_attr_health_status.attr, NULL, }; diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h index c297333..5968df8 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 = 13, IOCTL_WRITE_PGGS = 14, IOCTL_READ_PGGS = 15, + /* Set healthy bit value */ + IOCTL_SET_BOOT_HEALTH_STATUS = 17, }; enum pm_query_id { @@ -354,6 +356,7 @@ 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); #else static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void) { @@ -500,6 +503,10 @@ static inline int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype) { return -ENODEV; } +static inline int zynqmp_pm_set_boot_health_status(u32 value) +{ + return -ENODEV; +} #endif #endif /* __FIRMWARE_ZYNQMP_H__ */ -- 2.7.4
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