From: Ioana Ciornei <[email protected]> Add the autorescan sysfs in order to enable/disable the DPRC IRQs on which automatic rescan of the bus is performed. This is important when dynamic creation of objects is needed to happen in a timely manner because object creation can be bundled together.
Signed-off-by: Ioana Ciornei <[email protected]> --- Documentation/ABI/stable/sysfs-bus-fsl-mc | 10 +++++ drivers/bus/fsl-mc/dprc-driver.c | 17 ++++++- drivers/bus/fsl-mc/fsl-mc-bus.c | 55 +++++++++++++++++++++++ drivers/bus/fsl-mc/fsl-mc-private.h | 5 +++ 4 files changed, 85 insertions(+), 2 deletions(-) diff --git a/Documentation/ABI/stable/sysfs-bus-fsl-mc b/Documentation/ABI/stable/sysfs-bus-fsl-mc index a4d384df9ba8..58f06c7eeed7 100644 --- a/Documentation/ABI/stable/sysfs-bus-fsl-mc +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc @@ -7,3 +7,13 @@ Description: Writing a non-zero value to this attribute will synchronize the objects under fsl-mc bus and the Management Complex firmware. Users: Userspace drivers and management tools + +What: /sys/bus/fsl-mc/autorescan +Date: January 2021 +KernelVersion: 5.12 +Contact: Ioana Ciornei <[email protected]> +Description: Writing a zero value to this attribute will + disable the DPRC IRQs on which automatic rescan + of the fsl-mc bus is performed. A non-zero value + will enable the DPRC IRQs. +Users: Userspace drivers and management tools diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c index 4adb6f318884..e3e2ae41c22b 100644 --- a/drivers/bus/fsl-mc/dprc-driver.c +++ b/drivers/bus/fsl-mc/dprc-driver.c @@ -458,8 +458,9 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg) /* * Disable and clear interrupt for a given DPRC object */ -static int disable_dprc_irq(struct fsl_mc_device *mc_dev) +int disable_dprc_irq(struct fsl_mc_device *mc_dev) { + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); int error; struct fsl_mc_io *mc_io = mc_dev->mc_io; @@ -496,9 +497,18 @@ static int disable_dprc_irq(struct fsl_mc_device *mc_dev) return error; } + mc_bus->irq_enabled = 0; + return 0; } +int get_dprc_irq_state(struct fsl_mc_device *mc_dev) +{ + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); + + return mc_bus->irq_enabled; +} + static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev) { int error; @@ -525,8 +535,9 @@ static int register_dprc_irq_handler(struct fsl_mc_device *mc_dev) return 0; } -static int enable_dprc_irq(struct fsl_mc_device *mc_dev) +int enable_dprc_irq(struct fsl_mc_device *mc_dev) { + struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev); int error; /* @@ -554,6 +565,8 @@ static int enable_dprc_irq(struct fsl_mc_device *mc_dev) return error; } + mc_bus->irq_enabled = 1; + return 0; } diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c index 77708eaf2700..28d5da1c011c 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -241,8 +241,63 @@ static ssize_t rescan_store(struct bus_type *bus, } static BUS_ATTR_WO(rescan); +static int fsl_mc_bus_set_autorescan(struct device *dev, void *data) +{ + struct fsl_mc_device *root_mc_dev; + unsigned long val; + char *buf = data; + + if (!fsl_mc_is_root_dprc(dev)) + goto exit; + + root_mc_dev = to_fsl_mc_device(dev); + + if (kstrtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val) + enable_dprc_irq(root_mc_dev); + else + disable_dprc_irq(root_mc_dev); + +exit: + return 0; +} + +static int fsl_mc_bus_get_autorescan(struct device *dev, void *data) +{ + struct fsl_mc_device *root_mc_dev; + char *buf = data; + + if (!fsl_mc_is_root_dprc(dev)) + goto exit; + + root_mc_dev = to_fsl_mc_device(dev); + + sprintf(buf, "%d\n", get_dprc_irq_state(root_mc_dev)); +exit: + return 0; +} + +static ssize_t autorescan_store(struct bus_type *bus, + const char *buf, size_t count) +{ + bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_set_autorescan); + + return count; +} + +static ssize_t autorescan_show(struct bus_type *bus, char *buf) +{ + bus_for_each_dev(bus, NULL, (void *)buf, fsl_mc_bus_get_autorescan); + return strlen(buf); +} + +static BUS_ATTR_RW(autorescan); + static struct attribute *fsl_mc_bus_attrs[] = { &bus_attr_rescan.attr, + &bus_attr_autorescan.attr, NULL, }; diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h index 42bdb8679a36..1958fa065360 100644 --- a/drivers/bus/fsl-mc/fsl-mc-private.h +++ b/drivers/bus/fsl-mc/fsl-mc-private.h @@ -578,6 +578,7 @@ struct fsl_mc_bus { struct mutex scan_mutex; /* serializes bus scanning */ struct dprc_attributes dprc_attr; struct fsl_mc_uapi uapi_misc; + int irq_enabled; }; #define to_fsl_mc_bus(_mc_dev) \ @@ -656,4 +657,8 @@ static inline void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus) #endif +int disable_dprc_irq(struct fsl_mc_device *mc_dev); +int enable_dprc_irq(struct fsl_mc_device *mc_dev); +int get_dprc_irq_state(struct fsl_mc_device *mc_dev); + #endif /* _FSL_MC_PRIVATE_H_ */ -- 2.29.2
