linaro-kernel June 2013

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86 discussions

[PATCH V4 1/2] cpuidle: simplify multiple driver support

by Daniel Lezcano

Commit bf4d1b5ddb78f86078ac6ae0415802d5f0c68f92 brought the multiple driver support. The code added a couple of new API to register the driver per cpu. That led to some code complexity to handle the kernel config options when the multiple driver support is enabled or not, which is not really necessary. The code has to be compatible when the multiple driver support is not enabled, and the multiple driver support has to be compatible with the old api. This patch removes this API, which is not yet used by any driver but needed for the HMP cpuidle drivers which will come soon, and replaces its usage by a cpumask pointer in the cpuidle driver structure telling what cpus are handled by the driver. That let the API cpuidle_[un]register_driver to be used for the multiple driver support and also the cpuidle_[un]register functions, added recently in the cpuidle framework. Signed-off-by: Daniel Lezcano <daniel.lezcano(a)linaro.org> --- [V4] - uninitialize per cpu driver variable on error - rollback indentation in cpuidle.h [V3] - moved the kerneldoc and comments to a separate patch [V2]: - fixed bad refcount check - inverted clockevent notify off order at unregister time drivers/cpuidle/cpuidle.c | 4 +- drivers/cpuidle/driver.c | 192 +++++++++++++++++++-------------------------- include/linux/cpuidle.h | 6 +- 3 files changed, 84 insertions(+), 118 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index c3a93fe..fdc432f 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -466,7 +466,7 @@ void cpuidle_unregister(struct cpuidle_driver *drv) int cpu; struct cpuidle_device *device; - for_each_possible_cpu(cpu) { + for_each_cpu(cpu, drv->cpumask) { device = &per_cpu(cpuidle_dev, cpu); cpuidle_unregister_device(device); } @@ -498,7 +498,7 @@ int cpuidle_register(struct cpuidle_driver *drv, return ret; } - for_each_possible_cpu(cpu) { + for_each_cpu(cpu, drv->cpumask) { device = &per_cpu(cpuidle_dev, cpu); device->cpu = cpu; diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c index 8dfaaae..e75fa54 100644 --- a/drivers/cpuidle/driver.c +++ b/drivers/cpuidle/driver.c @@ -18,167 +18,140 @@ DEFINE_SPINLOCK(cpuidle_driver_lock); -static void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu); -static struct cpuidle_driver * __cpuidle_get_cpu_driver(int cpu); +#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS -static void cpuidle_setup_broadcast_timer(void *arg) +static DEFINE_PER_CPU(struct cpuidle_driver *, cpuidle_drivers); + +static struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu) { - int cpu = smp_processor_id(); - clockevents_notify((long)(arg), &cpu); + return per_cpu(cpuidle_drivers, cpu); } -static void __cpuidle_driver_init(struct cpuidle_driver *drv, int cpu) +static inline void __cpuidle_unset_driver(struct cpuidle_driver *drv) { - int i; - - drv->refcnt = 0; + int cpu; - for (i = drv->state_count - 1; i >= 0 ; i--) { + for_each_cpu(cpu, drv->cpumask) { - if (!(drv->states[i].flags & CPUIDLE_FLAG_TIMER_STOP)) + if (drv != __cpuidle_get_cpu_driver(cpu)) continue; - drv->bctimer = 1; - on_each_cpu_mask(get_cpu_mask(cpu), cpuidle_setup_broadcast_timer, - (void *)CLOCK_EVT_NOTIFY_BROADCAST_ON, 1); - break; + per_cpu(cpuidle_drivers, cpu) = NULL; } } -static int __cpuidle_register_driver(struct cpuidle_driver *drv, int cpu) +static inline int __cpuidle_set_driver(struct cpuidle_driver *drv) { - if (!drv || !drv->state_count) - return -EINVAL; - - if (cpuidle_disabled()) - return -ENODEV; + int cpu; - if (__cpuidle_get_cpu_driver(cpu)) - return -EBUSY; + for_each_cpu(cpu, drv->cpumask) { - __cpuidle_driver_init(drv, cpu); + if (__cpuidle_get_cpu_driver(cpu)) { + __cpuidle_unset_driver(drv); + return -EBUSY; + } - __cpuidle_set_cpu_driver(drv, cpu); + per_cpu(cpuidle_drivers, cpu) = drv; + } return 0; } -static void __cpuidle_unregister_driver(struct cpuidle_driver *drv, int cpu) -{ - if (drv != __cpuidle_get_cpu_driver(cpu)) - return; +#else - if (!WARN_ON(drv->refcnt > 0)) - __cpuidle_set_cpu_driver(NULL, cpu); +static struct cpuidle_driver *cpuidle_curr_driver; - if (drv->bctimer) { - drv->bctimer = 0; - on_each_cpu_mask(get_cpu_mask(cpu), cpuidle_setup_broadcast_timer, - (void *)CLOCK_EVT_NOTIFY_BROADCAST_OFF, 1); - } +static inline struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu) +{ + return cpuidle_curr_driver; } -#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS +static inline int __cpuidle_set_driver(struct cpuidle_driver *drv) +{ + if (cpuidle_curr_driver) + return -EBUSY; -static DEFINE_PER_CPU(struct cpuidle_driver *, cpuidle_drivers); + cpuidle_curr_driver = drv; -static void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu) -{ - per_cpu(cpuidle_drivers, cpu) = drv; + return 0; } -static struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu) +static inline void __cpuidle_unset_driver(struct cpuidle_driver *drv) { - return per_cpu(cpuidle_drivers, cpu); + if (drv == cpuidle_curr_driver) + cpuidle_curr_driver = NULL; } -static void __cpuidle_unregister_all_cpu_driver(struct cpuidle_driver *drv) +#endif + +static void cpuidle_setup_broadcast_timer(void *arg) { - int cpu; - for_each_present_cpu(cpu) - __cpuidle_unregister_driver(drv, cpu); + int cpu = smp_processor_id(); + clockevents_notify((long)(arg), &cpu); } -static int __cpuidle_register_all_cpu_driver(struct cpuidle_driver *drv) +static int __cpuidle_driver_init(struct cpuidle_driver *drv) { - int ret = 0; - int i, cpu; + int i; - for_each_present_cpu(cpu) { - ret = __cpuidle_register_driver(drv, cpu); - if (ret) - break; - } + drv->refcnt = 0; - if (ret) - for_each_present_cpu(i) { - if (i == cpu) - break; - __cpuidle_unregister_driver(drv, i); - } + if (!drv->cpumask) + drv->cpumask = (struct cpumask *)cpu_possible_mask; + for (i = drv->state_count - 1; i >= 0 ; i--) { - return ret; + if (!(drv->states[i].flags & CPUIDLE_FLAG_TIMER_STOP)) + continue; + + drv->bctimer = 1; + break; + } + + return 0; } -int cpuidle_register_cpu_driver(struct cpuidle_driver *drv, int cpu) +static int __cpuidle_register_driver(struct cpuidle_driver *drv) { int ret; - spin_lock(&cpuidle_driver_lock); - ret = __cpuidle_register_driver(drv, cpu); - spin_unlock(&cpuidle_driver_lock); + if (!drv || !drv->state_count) + return -EINVAL; - return ret; -} + if (cpuidle_disabled()) + return -ENODEV; -void cpuidle_unregister_cpu_driver(struct cpuidle_driver *drv, int cpu) -{ - spin_lock(&cpuidle_driver_lock); - __cpuidle_unregister_driver(drv, cpu); - spin_unlock(&cpuidle_driver_lock); -} + ret = __cpuidle_driver_init(drv); + if (ret) + return ret; -/** - * cpuidle_register_driver - registers a driver - * @drv: the driver - */ -int cpuidle_register_driver(struct cpuidle_driver *drv) -{ - int ret; + ret = __cpuidle_set_driver(drv); + if (ret) + return ret; - spin_lock(&cpuidle_driver_lock); - ret = __cpuidle_register_all_cpu_driver(drv); - spin_unlock(&cpuidle_driver_lock); + if (drv->bctimer) + on_each_cpu_mask(drv->cpumask, cpuidle_setup_broadcast_timer, + (void *)CLOCK_EVT_NOTIFY_BROADCAST_ON, 1); - return ret; + return 0; } -EXPORT_SYMBOL_GPL(cpuidle_register_driver); /** * cpuidle_unregister_driver - unregisters a driver * @drv: the driver */ -void cpuidle_unregister_driver(struct cpuidle_driver *drv) +static void __cpuidle_unregister_driver(struct cpuidle_driver *drv) { - spin_lock(&cpuidle_driver_lock); - __cpuidle_unregister_all_cpu_driver(drv); - spin_unlock(&cpuidle_driver_lock); -} -EXPORT_SYMBOL_GPL(cpuidle_unregister_driver); - -#else - -static struct cpuidle_driver *cpuidle_curr_driver; + if (WARN_ON(drv->refcnt > 0)) + return; -static inline void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu) -{ - cpuidle_curr_driver = drv; -} + if (drv->bctimer) { + drv->bctimer = 0; + on_each_cpu_mask(drv->cpumask, cpuidle_setup_broadcast_timer, + (void *)CLOCK_EVT_NOTIFY_BROADCAST_OFF, 1); + } -static inline struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu) -{ - return cpuidle_curr_driver; + __cpuidle_unset_driver(drv); } /** @@ -187,13 +160,11 @@ static inline struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu) */ int cpuidle_register_driver(struct cpuidle_driver *drv) { - int ret, cpu; + int ret; - cpu = get_cpu(); spin_lock(&cpuidle_driver_lock); - ret = __cpuidle_register_driver(drv, cpu); + ret = __cpuidle_register_driver(drv); spin_unlock(&cpuidle_driver_lock); - put_cpu(); return ret; } @@ -205,16 +176,11 @@ EXPORT_SYMBOL_GPL(cpuidle_register_driver); */ void cpuidle_unregister_driver(struct cpuidle_driver *drv) { - int cpu; - - cpu = get_cpu(); spin_lock(&cpuidle_driver_lock); - __cpuidle_unregister_driver(drv, cpu); + __cpuidle_unregister_driver(drv); spin_unlock(&cpuidle_driver_lock); - put_cpu(); } EXPORT_SYMBOL_GPL(cpuidle_unregister_driver); -#endif /** * cpuidle_get_driver - return the current driver diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 8f04062..0bc4b74 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -111,6 +111,9 @@ struct cpuidle_driver { struct cpuidle_state states[CPUIDLE_STATE_MAX]; int state_count; int safe_state_index; + + /* the driver handles the cpus in cpumask */ + struct cpumask *cpumask; }; #ifdef CONFIG_CPU_IDLE @@ -135,9 +138,6 @@ extern void cpuidle_disable_device(struct cpuidle_device *dev); extern int cpuidle_play_dead(void); extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev); -extern int cpuidle_register_cpu_driver(struct cpuidle_driver *drv, int cpu); -extern void cpuidle_unregister_cpu_driver(struct cpuidle_driver *drv, int cpu); - #else static inline void disable_cpuidle(void) { } static inline int cpuidle_idle_call(void) { return -ENODEV; } -- 1.7.9.5

10 years, 7 months

[PATCH] USB: EHCI: make ehci-w90X900 a separate driver

by Manjunath Goudar

Separate the W90X900(W90P910) on-chip host controller driver from ehci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM; however, note that other changes are still needed before W90X900(W90P910) can be booted with a multi-platform kernel and an ehci driver that only works on one of them. With the infrastructure added by Alan Stern in patch 3e0232039 "USB: EHCI: prepare to make ehci-hcd a library module", we can avoid this problem by turning a bus glue into a separate module, as we do here for the w90X900 bus glue. Signed-off-by: Manjunath Goudar <manjunath.goudar(a)linaro.org> Acked-by: Arnd Bergmann <arnd(a)arndb.de> Cc: Greg KH <greg(a)kroah.com> Cc: Alan Stern <stern(a)rowland.harvard.edu> Cc: Wan ZongShun <mcuos.com(a)gmail.com> Cc: linux-usb(a)vger.kernel.org Cc: linux-kernel(a)vger.kernel.org --- drivers/usb/host/Kconfig | 2 +- drivers/usb/host/Makefile | 1 + drivers/usb/host/ehci-hcd.c | 5 --- drivers/usb/host/ehci-w90x900.c | 85 ++++++++++++++++----------------------- 4 files changed, 37 insertions(+), 56 deletions(-) diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index a0a63df..f35f71e 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -244,7 +244,7 @@ config USB_EHCI_MV SoCs, see USB_EHCI_HCD_ORION for those. config USB_W90X900_EHCI - bool "W90X900(W90P910) EHCI support" + tristate "W90X900(W90P910) EHCI support" depends on ARCH_W90X900 ---help--- Enables support for the W90X900 USB controller diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 7664db8..28adb3f 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o obj-$(CONFIG_USB_EHCI_MV) += ehci-mv.o +obj-$(CONFIG_USB_W90X900_EHCI) += ehci-w90x900.o obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index 5717dcd..4a5644e 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -1249,11 +1249,6 @@ MODULE_LICENSE ("GPL"); #define XILINX_OF_PLATFORM_DRIVER ehci_hcd_xilinx_of_driver #endif -#ifdef CONFIG_USB_W90X900_EHCI -#include "ehci-w90x900.c" -#define PLATFORM_DRIVER ehci_hcd_w90x900_driver -#endif - #ifdef CONFIG_USB_OCTEON_EHCI #include "ehci-octeon.c" #define PLATFORM_DRIVER ehci_octeon_driver diff --git a/drivers/usb/host/ehci-w90x900.c b/drivers/usb/host/ehci-w90x900.c index 59e0e24..d9ecd79 100644 --- a/drivers/usb/host/ehci-w90x900.c +++ b/drivers/usb/host/ehci-w90x900.c @@ -11,13 +11,28 @@ * */ +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> +#include <linux/dma-mapping.h> +#include <linux/of.h> #include <linux/platform_device.h> +#include "ehci.h" + /* enable phy0 and phy1 for w90p910 */ #define ENPHY (0x01<<8) #define PHY0_CTR (0xA4) #define PHY1_CTR (0xA8) +#define DRIVER_DESC "w90p910 usb ehci driver!" + +static const char hcd_name[] = "ehci-w90x900 "; + +static struct hc_driver __read_mostly ehci_w90x900_hc_driver; + static int usb_w90x900_probe(const struct hc_driver *driver, struct platform_device *pdev) { @@ -99,54 +114,6 @@ void usb_w90x900_remove(struct usb_hcd *hcd, struct platform_device *pdev) usb_put_hcd(hcd); } -static const struct hc_driver ehci_w90x900_hc_driver = { - .description = hcd_name, - .product_desc = "Nuvoton w90x900 EHCI Host Controller", - .hcd_priv_size = sizeof(struct ehci_hcd), - - /* - * generic hardware linkage - */ - .irq = ehci_irq, - .flags = HCD_USB2|HCD_MEMORY, - - /* - * basic lifecycle operations - */ - .reset = ehci_setup, - .start = ehci_run, - - .stop = ehci_stop, - .shutdown = ehci_shutdown, - - /* - * managing i/o requests and associated device resources - */ - .urb_enqueue = ehci_urb_enqueue, - .urb_dequeue = ehci_urb_dequeue, - .endpoint_disable = ehci_endpoint_disable, - .endpoint_reset = ehci_endpoint_reset, - - /* - * scheduling support - */ - .get_frame_number = ehci_get_frame, - - /* - * root hub support - */ - .hub_status_data = ehci_hub_status_data, - .hub_control = ehci_hub_control, -#ifdef CONFIG_PM - .bus_suspend = ehci_bus_suspend, - .bus_resume = ehci_bus_resume, -#endif - .relinquish_port = ehci_relinquish_port, - .port_handed_over = ehci_port_handed_over, - - .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete, -}; - static int ehci_w90x900_probe(struct platform_device *pdev) { if (usb_disabled()) @@ -173,7 +140,25 @@ static struct platform_driver ehci_hcd_w90x900_driver = { }, }; +static int __init ehci_w90X900_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + ehci_init_driver(&ehci_w90x900_hc_driver, NULL); + return platform_driver_register(&ehci_hcd_w90x900_driver); +} +module_init(ehci_w90X900_init); + +static void __exit ehci_w90X900_cleanup(void) +{ + platform_driver_unregister(&ehci_hcd_w90x900_driver); +} +module_exit(ehci_w90X900_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR("Wan ZongShun <mcuos.com(a)gmail.com>"); -MODULE_DESCRIPTION("w90p910 usb ehci driver!"); -MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:w90p910-ehci"); +MODULE_LICENSE("GPL v2"); -- 1.7.9.5

10 years, 7 months

[PATCH] USB: OHCI: make ohci-nxp a separate driver

by Manjunath Goudar

Separate the OHCI NXP host controller driver from ohci-hcd host code so that it can be built as a separate driver module. This work is part of enabling multi-platform kernels on ARM. Many place function name and struct name started with usb, current scenario replaced usb with ohci for proper naming. Signed-off-by: Manjunath Goudar <manjunath.goudar(a)linaro.org> Cc: Arnd Bergmann <arnd(a)arndb.de> Cc: Alan Stern <stern(a)rowland.harvard.edu> Cc: Greg KH <greg(a)kroah.com> Cc: linux-usb(a)vger.kernel.org --- drivers/usb/host/Kconfig | 8 +++ drivers/usb/host/Makefile | 1 + drivers/usb/host/ohci-hcd.c | 15 ------ drivers/usb/host/ohci-nxp.c | 124 +++++++++++++++++-------------------------- 4 files changed, 58 insertions(+), 90 deletions(-) diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index f19524f..002bf73 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -398,6 +398,14 @@ config USB_OHCI_HCD_S3CXXXX Enables support for the on-chip OHCI controller on S3CXXXX chips. +config USB_OHCI_HCD_LPC32XX + tristate "Support for LPC on-chip OHCI USB controller" + depends on USB_OHCI_HCD && ARCH_LPC32XX + default y + ---help--- + Enables support for the on-chip OHCI controller on + NXP chips. + config USB_OHCI_HCD_AT91 tristate "Support for Atmel on-chip OHCI USB controller" depends on USB_OHCI_HCD && ARCH_AT91 diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index 9dffe81..edc0909 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -52,6 +52,7 @@ obj-$(CONFIG_USB_OHCI_HCD_OMAP3) += ohci-omap3.o obj-$(CONFIG_USB_OHCI_HCD_SPEAR) += ohci-spear.o obj-$(CONFIG_USB_OHCI_HCD_AT91) += ohci-at91.o obj-$(CONFIG_USB_OHCI_HCD_S3CXXXX) += ohci-s3c2410.o +obj-$(CONFIG_USB_OHCI_HCD_LPC32XX) += ohci-nxp.o obj-$(CONFIG_USB_UHCI_HCD) += uhci-hcd.o obj-$(CONFIG_USB_FHCI_HCD) += fhci.o diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c index f3dcaa2..9a0b023 100644 --- a/drivers/usb/host/ohci-hcd.c +++ b/drivers/usb/host/ohci-hcd.c @@ -1194,11 +1194,6 @@ MODULE_LICENSE ("GPL"); #define EP93XX_PLATFORM_DRIVER ohci_hcd_ep93xx_driver #endif -#ifdef CONFIG_ARCH_LPC32XX -#include "ohci-nxp.c" -#define NXP_PLATFORM_DRIVER usb_hcd_nxp_driver -#endif - #ifdef CONFIG_ARCH_DAVINCI_DA8XX #include "ohci-da8xx.c" #define DAVINCI_PLATFORM_DRIVER ohci_hcd_da8xx_driver @@ -1301,12 +1296,6 @@ static int __init ohci_hcd_mod_init(void) goto error_ep93xx; #endif -#ifdef NXP_PLATFORM_DRIVER - retval = platform_driver_register(&NXP_PLATFORM_DRIVER); - if (retval < 0) - goto error_nxp; -#endif - #ifdef DAVINCI_PLATFORM_DRIVER retval = platform_driver_register(&DAVINCI_PLATFORM_DRIVER); if (retval < 0) @@ -1320,10 +1309,6 @@ static int __init ohci_hcd_mod_init(void) platform_driver_unregister(&DAVINCI_PLATFORM_DRIVER); error_davinci: #endif -#ifdef NXP_PLATFORM_DRIVER - platform_driver_unregister(&NXP_PLATFORM_DRIVER); - error_nxp: -#endif #ifdef EP93XX_PLATFORM_DRIVER platform_driver_unregister(&EP93XX_PLATFORM_DRIVER); error_ep93xx: diff --git a/drivers/usb/host/ohci-nxp.c b/drivers/usb/host/ohci-nxp.c index 7d7d507..8d6eecf 100644 --- a/drivers/usb/host/ohci-nxp.c +++ b/drivers/usb/host/ohci-nxp.c @@ -19,10 +19,19 @@ * or implied. */ #include <linux/clk.h> -#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> #include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> #include <linux/of.h> +#include <linux/platform_device.h> #include <linux/usb/isp1301.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "ohci.h" + #include <mach/hardware.h> #include <asm/mach-types.h> @@ -57,6 +66,11 @@ #define start_int_umask(irq) #endif +#define DRIVER_DESC "OHCI NXP driver" + +static const char hcd_name[] = "ohci-nxp"; +static struct hc_driver __read_mostly ohci_nxp_hc_driver; + static struct i2c_client *isp1301_i2c_client; extern int usb_disabled(void); @@ -132,14 +146,14 @@ static inline void isp1301_vbus_off(void) OTG1_VBUS_DRV); } -static void nxp_start_hc(void) +static void ohci_nxp_start_hc(void) { unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN; __raw_writel(tmp, USB_OTG_STAT_CONTROL); isp1301_vbus_on(); } -static void nxp_stop_hc(void) +static void ohci_nxp_stop_hc(void) { unsigned long tmp; isp1301_vbus_off(); @@ -147,68 +161,9 @@ static void nxp_stop_hc(void) __raw_writel(tmp, USB_OTG_STAT_CONTROL); } -static int ohci_nxp_start(struct usb_hcd *hcd) -{ - struct ohci_hcd *ohci = hcd_to_ohci(hcd); - int ret; - - if ((ret = ohci_init(ohci)) < 0) - return ret; - - if ((ret = ohci_run(ohci)) < 0) { - dev_err(hcd->self.controller, "can't start\n"); - ohci_stop(hcd); - return ret; - } - return 0; -} - -static const struct hc_driver ohci_nxp_hc_driver = { - .description = hcd_name, - .product_desc = "nxp OHCI", - - /* - * generic hardware linkage - */ - .irq = ohci_irq, - .flags = HCD_USB11 | HCD_MEMORY, - - .hcd_priv_size = sizeof(struct ohci_hcd), - /* - * basic lifecycle operations - */ - .start = ohci_nxp_start, - .stop = ohci_stop, - .shutdown = ohci_shutdown, - - /* - * managing i/o requests and associated device resources - */ - .urb_enqueue = ohci_urb_enqueue, - .urb_dequeue = ohci_urb_dequeue, - .endpoint_disable = ohci_endpoint_disable, - - /* - * scheduling support - */ - .get_frame_number = ohci_get_frame, - - /* - * root hub support - */ - .hub_status_data = ohci_hub_status_data, - .hub_control = ohci_hub_control, -#ifdef CONFIG_PM - .bus_suspend = ohci_bus_suspend, - .bus_resume = ohci_bus_resume, -#endif - .start_port_reset = ohci_start_port_reset, -}; - -static int usb_hcd_nxp_probe(struct platform_device *pdev) +static int ohci_hcd_nxp_probe(struct platform_device *pdev) { struct usb_hcd *hcd = 0; - struct ohci_hcd *ohci; const struct hc_driver *driver = &ohci_nxp_hc_driver; struct resource *res; int ret = 0, irq; @@ -313,17 +268,15 @@ static int usb_hcd_nxp_probe(struct platform_device *pdev) goto fail_resource; } - nxp_start_hc(); + ohci_nxp_start_hc(); platform_set_drvdata(pdev, hcd); - ohci = hcd_to_ohci(hcd); - ohci_hcd_init(ohci); dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq); ret = usb_add_hcd(hcd, irq, 0); if (ret == 0) return ret; - nxp_stop_hc(); + ohci_nxp_stop_hc(); fail_resource: usb_put_hcd(hcd); fail_hcd: @@ -345,12 +298,12 @@ fail_disable: return ret; } -static int usb_hcd_nxp_remove(struct platform_device *pdev) +static int ohci_hcd_nxp_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); usb_remove_hcd(hcd); - nxp_stop_hc(); + ohci_nxp_stop_hc(); usb_put_hcd(hcd); clk_disable(usb_pll_clk); clk_put(usb_pll_clk); @@ -366,20 +319,41 @@ static int usb_hcd_nxp_remove(struct platform_device *pdev) MODULE_ALIAS("platform:usb-ohci"); #ifdef CONFIG_OF -static const struct of_device_id usb_hcd_nxp_match[] = { +static const struct of_device_id ohci_hcd_nxp_match[] = { { .compatible = "nxp,ohci-nxp" }, {}, }; -MODULE_DEVICE_TABLE(of, usb_hcd_nxp_match); +MODULE_DEVICE_TABLE(of, ohci_hcd_nxp_match); #endif -static struct platform_driver usb_hcd_nxp_driver = { +static struct platform_driver ohci_hcd_nxp_driver = { .driver = { .name = "usb-ohci", .owner = THIS_MODULE, - .of_match_table = of_match_ptr(usb_hcd_nxp_match), + .of_match_table = of_match_ptr(ohci_hcd_nxp_match), }, - .probe = usb_hcd_nxp_probe, - .remove = usb_hcd_nxp_remove, + .probe = ohci_hcd_nxp_probe, + .remove = ohci_hcd_nxp_remove, }; +static int __init ohci_nxp_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + ohci_init_driver(&ohci_nxp_hc_driver, NULL); + return platform_driver_register(&ohci_hcd_nxp_driver); +} +module_init(ohci_nxp_init); + +static void __exit ohci_nxp_cleanup(void) +{ + platform_driver_unregister(&ohci_hcd_nxp_driver); +} +module_exit(ohci_nxp_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL v2"); + -- 1.7.9.5

10 years, 8 months

[PATCH V3 0/6] USB: OHCI: more bus glues as separate modules

by Manjunath Goudar

These patches are for separating the SOC On-Chip ohci host controller from ohci-hcd host code into its own driver module. This work is part of enabling multi-platform kernels on ARM; it would be nice to have in 3.11. V2: In patch 5/6 and 6/6: -Set non-standard fields in hc_driver manually, rather than relying on an expanded struct ohci_driver_overrides. -Save orig_ohci_hub_control and orig_ohci_hub_status_data rather than relying on ohci_hub_control and hub_status_data being exported. In patch 1/6 to 4/6 -ohci_setup() has been removed because it is called in .reset member of the ohci_hc_driver structure. V3: In patch 5/6 and 6/6: -ohci_setup() has been removed because it is called in .reset member of the ohci_hc_driver structure. In patch 5/6: -The ohci_restart() function is not required in current scenario, only discarding connection state of integrated transceivers is sufficient, for this directly handling ohci->hc_control. In patch 2/6 : -rewritten if (config->otg || config->rwc) block statements into two separate 'if blocks' to handle below scenarios 1. config->otg set scenario. 2. if any of these (config->otg, config->rwc) are set, this scenario should be handled only after ohci_setup() In patch 1/6 and 4/6: No change. Manjunath Goudar (6): USB: OHCI: make ohci-exynos a separate driver USB: OHCI: make ohci-omap a separate driver USB: OHCI: make ohci-omap3 a separate driver USB: OHCI: make ohci-spear a separate driver USB: OHCI: make ohci-at91 a separate driver USB: OHCI: make ohci-s3c2410 a separate driver drivers/usb/host/Kconfig | 30 ++++++- drivers/usb/host/Makefile | 6 ++ drivers/usb/host/ohci-at91.c | 151 ++++++++++++++++------------------- drivers/usb/host/ohci-exynos.c | 167 ++++++++++++++++----------------------- drivers/usb/host/ohci-hcd.c | 108 ------------------------- drivers/usb/host/ohci-omap.c | 157 +++++++++++++----------------------- drivers/usb/host/ohci-omap3.c | 113 ++++++++------------------ drivers/usb/host/ohci-s3c2410.c | 128 +++++++++++++----------------- drivers/usb/host/ohci-spear.c | 140 +++++++++++++------------------- 9 files changed, 369 insertions(+), 631 deletions(-) -- 1.7.9.5

10 years, 9 months

[PATCH V2] ARM: cpuidle: davinci: Fix target residency

by Daniel Lezcano

The commit 19976c2a88d125aec16b9255c7197c297bbdd637 changed the target residency to 100000, assuming this is a careless mistake. commit 19976c2a88d125aec16b9255c7197c297bbdd637 Author: Robert Lee <rob.lee(a)linaro.org> Date: Tue Mar 20 15:22:45 2012 -0500 ARM: davinci: Consolidate time keeping and irq enable Enable core cpuidle timekeeping and irq enabling and remove that handling from this code. Signed-off-by: Robert Lee <rob.lee(a)linaro.org> Reviewed-by: Kevin Hilman <khilman(a)ti.com> Reviewed-by: Daniel Lezcano <daniel.lezcano(a)linaro.org> Acked-by: Jean Pihet <j-pihet(a)ti.com> Signed-off-by: Len Brown <len.brown(a)intel.com> The same happened to the at91's cpuidle driver. Fix it by putting the initial value to 10000. Signed-off-by: Daniel Lezcano <daniel.lezcano(a)linaro.org> --- arch/arm/mach-davinci/cpuidle.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/mach-davinci/cpuidle.c b/arch/arm/mach-davinci/cpuidle.c index 36aef3a..f1ac1c9 100644 --- a/arch/arm/mach-davinci/cpuidle.c +++ b/arch/arm/mach-davinci/cpuidle.c @@ -65,7 +65,7 @@ static struct cpuidle_driver davinci_idle_driver = { .states[1] = { .enter = davinci_enter_idle, .exit_latency = 10, - .target_residency = 100000, + .target_residency = 10000, .flags = CPUIDLE_FLAG_TIME_VALID, .name = "DDR SR", .desc = "WFI and DDR Self Refresh", -- 1.7.9.5

10 years, 9 months

[PATCH] ARM: vexpress_defconfig: Enable voltage regulators

by Christoffer Dall

Enable the Versatile Express voltage regulators by default. This should work on all verstatile express platforms and not enabling it prevents a defconfig'ed kernel from using the SD card controller on the qemu emulated platform, which is unfortunate for first-time casual users. Cc: Peter Maydell <peter.maydell(a)linaro.org> Signed-off-by: Christoffer Dall <christoffer.dall(a)linaro.org> --- arch/arm/configs/vexpress_defconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/configs/vexpress_defconfig b/arch/arm/configs/vexpress_defconfig index f2de51f..17104d9 100644 --- a/arch/arm/configs/vexpress_defconfig +++ b/arch/arm/configs/vexpress_defconfig @@ -138,3 +138,6 @@ CONFIG_DEBUG_LL=y CONFIG_EARLY_PRINTK=y # CONFIG_CRYPTO_ANSI_CPRNG is not set # CONFIG_CRYPTO_HW is not set +CONFIG_REGULATOR=y +CONFIG_REGULATOR_FIXED_VOLTAGE=y +CONFIG_REGULATOR_VEXPRESS=y -- 1.7.9.5

10 years, 9 months

[PATCH] ACPI/fan: Initialize acpi_state variable

by naresh.bhat＠linaro.org

From: Naresh Bhat <naresh.bhat(a)linaro.org> CC drivers/acpi/fan.o drivers/acpi/fan.c: In function ‘fan_get_cur_state’: drivers/acpi/fan.c:96:9: warning: ‘acpi_state’ may be used uninitialized in this function [-Wuninitialized] --- drivers/acpi/fan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c index f815da8..f961435 100644 --- a/drivers/acpi/fan.c +++ b/drivers/acpi/fan.c @@ -84,7 +84,7 @@ static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long { struct acpi_device *device = cdev->devdata; int result; - int acpi_state; + int acpi_state = ACPI_STATE_D0; if (!device) return -EINVAL; -- 1.7.9.5

10 years, 9 months

[PATCH] i2c: iop3xxx: fix build failure after waitqueue changes

by Kevin Hilman

There has long been a syntax problem in iop3xx_i2c_wait_event() which has been somehow hidden by the macros in <linux/wait.h>. After some recent cleanup/rework of the wait_event_* helpers, the bug has come out from hiding and now results in build failure: /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c: In function 'iop3xx_i2c_wait_event': /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:143: error: expected ')' before ';' token /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:157: error: expected ')' before ';' token /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:213: error: expected ')' before ';' token /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:291: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement] /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:551: error: expected ')' before ';' token /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:565: error: expected ')' before ';' token /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:764: error: expected ')' before ';' token /work/kernel/next/drivers/i2c/busses/i2c-iop3xx.c:176:778: error: expected ')' b Fix by removing stray ';' Signed-off-by: Kevin Hilman <khilman(a)linaro.org> --- Discovered in new build failure of iop32xx_defconfig with next-20130628 drivers/i2c/busses/i2c-iop3xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-iop3xx.c b/drivers/i2c/busses/i2c-iop3xx.c index bc99333..dd24aa0 100644 --- a/drivers/i2c/busses/i2c-iop3xx.c +++ b/drivers/i2c/busses/i2c-iop3xx.c @@ -176,7 +176,7 @@ iop3xx_i2c_wait_event(struct i2c_algo_iop3xx_data *iop3xx_adap, interrupted = wait_event_interruptible_timeout ( iop3xx_adap->waitq, (done = compare( sr = iop3xx_i2c_get_srstat(iop3xx_adap) ,flags )), - 1 * HZ; + 1 * HZ ); if ((rc = iop3xx_i2c_error(sr)) < 0) { *status = sr; -- 1.8.3

10 years, 9 months

[PATCH 7/7] ARM: add uprobes support

by David Long

From: "David A. Long" <dave.long(a)linaro.org> Using Rabin Vincent's ARM uprobes patches as a base, enable uprobes support on ARM. Caveats: - Thumb is not supported - XOL abort/trap handling is not implemented Signed-off-by: David A. Long <dave.long(a)linaro.org> --- arch/arm/Kconfig | 4 + arch/arm/include/asm/ptrace.h | 6 + arch/arm/include/asm/thread_info.h | 5 +- arch/arm/include/asm/uprobes.h | 34 ++++++ arch/arm/kernel/Makefile | 1 + arch/arm/kernel/signal.c | 4 + arch/arm/kernel/uprobes-arm.c | 220 +++++++++++++++++++++++++++++++++++++ arch/arm/kernel/uprobes.c | 203 ++++++++++++++++++++++++++++++++++ arch/arm/kernel/uprobes.h | 25 +++++ arch/powerpc/include/asm/uprobes.h | 1 - include/linux/uprobes.h | 3 + kernel/events/uprobes.c | 1 + 12 files changed, 505 insertions(+), 2 deletions(-) create mode 100644 arch/arm/include/asm/uprobes.h create mode 100644 arch/arm/kernel/uprobes-arm.c create mode 100644 arch/arm/kernel/uprobes.c create mode 100644 arch/arm/kernel/uprobes.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 2651b1d..3b17923 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -192,6 +192,10 @@ config ZONE_DMA config NEED_DMA_MAP_STATE def_bool y +config ARCH_SUPPORTS_UPROBES + depends on KPROBES + def_bool y + config ARCH_HAS_DMA_SET_COHERENT_MASK bool diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 3d52ee1..c223e90 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -76,6 +76,12 @@ static inline long regs_return_value(struct pt_regs *regs) #define instruction_pointer(regs) (regs)->ARM_pc +static inline void instruction_pointer_set(struct pt_regs *regs, + unsigned long val) +{ + instruction_pointer(regs) = val; +} + #ifdef CONFIG_SMP extern unsigned long profile_pc(struct pt_regs *regs); #else diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index 1995d1a..a46e350 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -148,6 +148,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *, #define TIF_SIGPENDING 0 #define TIF_NEED_RESCHED 1 #define TIF_NOTIFY_RESUME 2 /* callback before returning to user */ +#define TIF_UPROBE 7 #define TIF_SYSCALL_TRACE 8 #define TIF_SYSCALL_AUDIT 9 #define TIF_SYSCALL_TRACEPOINT 10 @@ -161,6 +162,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *, #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) +#define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) @@ -174,7 +176,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *, /* * Change these and you break ASM code in entry-common.S */ -#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_RESUME) +#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ + _TIF_NOTIFY_RESUME | _TIF_UPROBE) #endif /* __KERNEL__ */ #endif /* __ASM_ARM_THREAD_INFO_H */ diff --git a/arch/arm/include/asm/uprobes.h b/arch/arm/include/asm/uprobes.h new file mode 100644 index 0000000..fa4b81e --- /dev/null +++ b/arch/arm/include/asm/uprobes.h @@ -0,0 +1,34 @@ +#ifndef _ASM_UPROBES_H +#define _ASM_UPROBES_H + +#include <asm/probes.h> + +typedef u32 uprobe_opcode_t; + +#define MAX_UINSN_BYTES 4 +#define UPROBE_XOL_SLOT_BYTES 64 + +#define UPROBE_SWBP_INSN 0x07f001f9 +#define UPROBE_SS_INSN 0x07f001fa +#define UPROBE_SWBP_INSN_SIZE 4 + +struct arch_uprobe_task { + u32 backup; +}; + +struct arch_uprobe { + u8 insn[MAX_UINSN_BYTES]; + uprobe_opcode_t modinsn; + uprobe_opcode_t bpinsn; + bool simulate; + u32 pcreg; + void (*prehandler)(struct arch_uprobe *auprobe, + struct arch_uprobe_task *autask, + struct pt_regs *regs); + void (*posthandler)(struct arch_uprobe *auprobe, + struct arch_uprobe_task *autask, + struct pt_regs *regs); + struct arch_specific_insn asi; +}; + +#endif diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 9053be4..855d82c 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o insn.o obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o insn.o obj-$(CONFIG_JUMP_LABEL) += jump_label.o insn.o patch.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o +obj-$(CONFIG_UPROBES) += probes.o uprobes.o uprobes-arm.o kprobes-arm.o obj-$(CONFIG_KPROBES) += probes.o kprobes.o kprobes-common.o patch.o ifdef CONFIG_THUMB2_KERNEL obj-$(CONFIG_KPROBES) += kprobes-thumb.o diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 296786b..7d9d2cd 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -12,6 +12,7 @@ #include <linux/personality.h> #include <linux/uaccess.h> #include <linux/tracehook.h> +#include <linux/uprobes.h> #include <asm/elf.h> #include <asm/cacheflush.h> @@ -593,6 +594,9 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) return restart; } syscall = 0; + } else if (thread_flags & _TIF_UPROBE) { + clear_thread_flag(TIF_UPROBE); + uprobe_notify_resume(regs); } else { clear_thread_flag(TIF_NOTIFY_RESUME); tracehook_notify_resume(regs); diff --git a/arch/arm/kernel/uprobes-arm.c b/arch/arm/kernel/uprobes-arm.c new file mode 100644 index 0000000..f43d0c5 --- /dev/null +++ b/arch/arm/kernel/uprobes-arm.c @@ -0,0 +1,220 @@ +#include <linux/kernel.h> +#include <linux/kprobes.h> +#include <linux/uprobes.h> +#include <linux/module.h> + +#include "kprobes.h" +#include "uprobes.h" +#include "probes-arm.h" + +static int uprobes_substitute_pc(kprobe_opcode_t *pinsn, u32 oregs) +{ + kprobe_opcode_t insn = *pinsn; + kprobe_opcode_t temp; + kprobe_opcode_t mask; + int freereg; + u32 free = 0xffff; + u32 regs; + + for (regs = oregs; regs; regs >>= 4, insn >>= 4) { + if ((regs & 0xf) == REG_TYPE_NONE) + continue; + + free &= ~(1 << (insn & 0xf)); + } + + /* No PC, no problem */ + if (free & (1 << 15)) + return 15; + + if (!free) + return -1; + + /* + * fls instead of ffs ensures that for "ldrd r0, r1, [pc]" we would + * pick LR instead of R1. + */ + freereg = free = fls(free) - 1; + + temp = *pinsn; + insn = *pinsn; + regs = oregs; + mask = 0xf; + + for (; regs; regs >>= 4, mask <<= 4, free <<= 4, temp >>= 4) { + if ((regs & 0xf) == REG_TYPE_NONE) + continue; + + if ((temp & 0xf) != 15) + continue; + + insn &= ~mask; + insn |= free & mask; + } + + *pinsn = insn; + return freereg; +} + +static void uprobe_set_pc(struct arch_uprobe *auprobe, + struct arch_uprobe_task *autask, + struct pt_regs *regs) +{ + u32 pcreg = auprobe->pcreg; + + autask->backup = regs->uregs[pcreg]; + regs->uregs[pcreg] = regs->ARM_pc + 8; +} + +static void uprobe_unset_pc(struct arch_uprobe *auprobe, + struct arch_uprobe_task *autask, + struct pt_regs *regs) +{ + /* PC will be taken care of by common code */ + regs->uregs[auprobe->pcreg] = autask->backup; +} + +static void uprobe_aluwrite_pc(struct arch_uprobe *auprobe, + struct arch_uprobe_task *autask, + struct pt_regs *regs) +{ + u32 pcreg = auprobe->pcreg; + + alu_write_pc(regs->uregs[pcreg], regs); + regs->uregs[pcreg] = autask->backup; +} + +static void uprobe_write_pc(struct arch_uprobe *auprobe, + struct arch_uprobe_task *autask, + struct pt_regs *regs) +{ + u32 pcreg = auprobe->pcreg; + + load_write_pc(regs->uregs[pcreg], regs); + regs->uregs[pcreg] = autask->backup; +} + +enum kprobe_insn +decode_pc_ro(kprobe_opcode_t insn, struct arch_specific_insn *asi, void *d) +{ + struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe, + asi); + struct decode_emulate *decode = d; + u32 regs = decode->header.type_regs.bits >> DECODE_TYPE_BITS; + int reg; + + reg = uprobes_substitute_pc(&auprobe->modinsn, regs); + if (reg == 15) + return INSN_GOOD; + + if (reg == -1) + return INSN_REJECTED; + + auprobe->pcreg = reg; + auprobe->prehandler = uprobe_set_pc; + auprobe->posthandler = uprobe_unset_pc; + + return INSN_GOOD; +} + +enum kprobe_insn +decode_wb_pc(kprobe_opcode_t insn, struct arch_specific_insn *asi, + void *d, bool alu) +{ + struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe, + asi); + enum kprobe_insn ret = decode_pc_ro(insn, asi, d); + + if (((insn >> 12) & 0xf) == 15) + auprobe->posthandler = alu ? uprobe_aluwrite_pc + : uprobe_write_pc; + + return ret; +} + +enum kprobe_insn +decode_rd12rn16rm0rs8_rwflags(kprobe_opcode_t insn, + struct arch_specific_insn *asi, void *d) +{ + return decode_wb_pc(insn, asi, d, true); +} + +enum kprobe_insn +decode_ldr(kprobe_opcode_t insn, struct arch_specific_insn *asi, void *d) +{ + return decode_wb_pc(insn, asi, d, false); +} + +enum kprobe_insn +uprobe_decode_ldmstm(kprobe_opcode_t insn, + struct arch_specific_insn *asi, void *d) +{ + struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe, + asi); + unsigned reglist = insn & 0xffff; + int rn = (insn >> 16) & 0xf; + int lbit = insn & (1 << 20); + unsigned used = reglist | (1 << rn); + + if (rn == 15) + return INSN_REJECTED; + + if (!(used & (1 << 15))) + return INSN_GOOD; + + if (used & (1 << 14)) + return INSN_REJECTED; + + /* Use LR instead of PC */ + insn ^= 0xc000; + + auprobe->pcreg = 14; + auprobe->modinsn = insn; + + auprobe->prehandler = uprobe_set_pc; + if (lbit) + auprobe->posthandler = uprobe_write_pc; + else + auprobe->posthandler = uprobe_unset_pc; + + return INSN_GOOD; +} + +const union decode_item uprobes_probes_actions[] = { + [PROBES_EMULATE_NONE] {.handler = kprobe_simulate_nop}, + [PROBES_SIMULATE_NOP] = {.handler = kprobe_simulate_nop}, + [PROBES_PRELOAD_IMM] = {.handler = kprobe_simulate_nop}, + [PROBES_PRELOAD_REG] = {.handler = kprobe_simulate_nop}, + [PROBES_BRANCH_IMM] = {.handler = simulate_blx1}, + [PROBES_MRS] = {.handler = simulate_mrs}, + [PROBES_BRANCH_REG] = {.handler = simulate_blx2bx}, + [PROBES_CLZ] = {.handler = kprobe_simulate_nop}, + [PROBES_SATURATING_ARITHMETIC] = {.handler = kprobe_simulate_nop}, + [PROBES_MUL1] = {.handler = kprobe_simulate_nop}, + [PROBES_MUL2] = {.handler = kprobe_simulate_nop}, + [PROBES_SWP] = {.handler = kprobe_simulate_nop}, + [PROBES_LDRSTRD] = {.decoder = decode_pc_ro}, + [PROBES_LOAD_EXTRA] = {.decoder = decode_pc_ro}, + [PROBES_LOAD] = {.decoder = decode_ldr}, + [PROBES_STORE_EXTRA] = {.decoder = decode_pc_ro}, + [PROBES_STORE] = {.decoder = decode_pc_ro}, + [PROBES_MOV_IP_SP] = {.handler = simulate_mov_ipsp}, + [PROBES_DATA_PROCESSING_REG] = { + .decoder = decode_rd12rn16rm0rs8_rwflags}, + [PROBES_DATA_PROCESSING_IMM] = { + .decoder = decode_rd12rn16rm0rs8_rwflags}, + [PROBES_MOV_HALFWORD] = {.handler = kprobe_simulate_nop}, + [PROBES_SEV] = {.handler = kprobe_simulate_nop}, + [PROBES_WFE] = {.handler = kprobe_simulate_nop}, + [PROBES_SATURATE] = {.handler = kprobe_simulate_nop}, + [PROBES_REV] = {.handler = kprobe_simulate_nop}, + [PROBES_MMI] = {.handler = kprobe_simulate_nop}, + [PROBES_PACK] = {.handler = kprobe_simulate_nop}, + [PROBES_EXTEND] = {.handler = kprobe_simulate_nop}, + [PROBES_EXTEND_ADD] = {.handler = kprobe_simulate_nop}, + [PROBES_MUL_ADD_LONG] = {.handler = kprobe_simulate_nop}, + [PROBES_MUL_ADD] = {.handler = kprobe_simulate_nop}, + [PROBES_BITFIELD] = {.handler = kprobe_simulate_nop}, + [PROBES_BRANCH] = {.handler = simulate_bbl}, + [PROBES_LDMSTM] = {.decoder = uprobe_decode_ldmstm} +}; diff --git a/arch/arm/kernel/uprobes.c b/arch/arm/kernel/uprobes.c new file mode 100644 index 0000000..2fdc668 --- /dev/null +++ b/arch/arm/kernel/uprobes.c @@ -0,0 +1,203 @@ +/* + * Copyright (C) 2012 Rabin Vincent <rabin at rab.in> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/uprobes.h> +#include <linux/notifier.h> +#include <linux/kprobes.h> + +#include <asm/opcodes.h> +#include <asm/traps.h> + +#include "kprobes.h" +#include "uprobes.h" +#include "probes-arm.h" +#include "kprobes.h" + +bool is_swbp_insn(uprobe_opcode_t *insn) +{ + return (__mem_to_opcode_arm(*insn) & 0x0fffffff) == UPROBE_SWBP_INSN; +} + +bool arch_uprobe_ignore(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + if (!auprobe->asi.insn_check_cc(regs->ARM_cpsr)) { + regs->ARM_pc += 4; + return true; + } + + return false; +} + +bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct kprobe kp; + + if (!auprobe->simulate) + return false; + + kp.addr = (void *) regs->ARM_pc; + kp.opcode = __mem_to_opcode_arm(*(unsigned int *) auprobe->insn); + kp.ainsn.insn_handler = auprobe->asi.insn_handler; + + auprobe->asi.insn_singlestep(&kp, regs); + + return true; +} + +unsigned long +arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, + struct pt_regs *regs) +{ + regs->ARM_pc = trampoline_vaddr; + return trampoline_vaddr; +} + +int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, + unsigned long addr) +{ + unsigned int insn; + unsigned int bpinsn; + enum kprobe_insn ret; + + /* Thumb not yet support */ + if (addr & 0x3) + return -EINVAL; + + insn = __mem_to_opcode_arm(*(unsigned int *)auprobe->insn); + auprobe->modinsn = insn; + + ret = arm_probes_decode_insn(insn, &auprobe->asi, true, + uprobes_probes_actions); + switch (ret) { + case INSN_REJECTED: + return -EINVAL; + + case INSN_GOOD_NO_SLOT: + auprobe->simulate = true; + break; + + case INSN_GOOD: + default: + break; + } + + bpinsn = UPROBE_SWBP_INSN; + if (insn >= 0xe0000000) + bpinsn |= 0xe0000000; /* Unconditional instruction */ + else + bpinsn |= insn & 0xf0000000; /* Copy condition from insn */ + + auprobe->bpinsn = bpinsn; + + return 0; +} + +void arch_uprobe_write_opcode(struct arch_uprobe *auprobe, void *vaddr, + uprobe_opcode_t opcode) +{ + unsigned long *addr = vaddr; + + if (opcode == UPROBE_SWBP_INSN) + opcode = __opcode_to_mem_arm(auprobe->bpinsn); + + *addr = opcode; +} + +void arch_uprobe_xol_copy(struct arch_uprobe *auprobe, void *vaddr) +{ + unsigned long *addr = vaddr; + + addr[0] = __opcode_to_mem_arm(auprobe->modinsn); + addr[1] = __opcode_to_mem_arm(0xe0000000 | UPROBE_SS_INSN); +} + +int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct uprobe_task *utask = current->utask; + + if (auprobe->prehandler) + auprobe->prehandler(auprobe, &utask->autask, regs); + + regs->ARM_pc = utask->xol_vaddr; + + return 0; +} + +int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + struct uprobe_task *utask = current->utask; + + regs->ARM_pc = utask->vaddr + 4; + + if (auprobe->posthandler) + auprobe->posthandler(auprobe, &utask->autask, regs); + + return 0; +} + +bool arch_uprobe_xol_was_trapped(struct task_struct *t) +{ + /* TODO: implement */ + return false; +} + +void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs) +{ + /* TODO: implement */ +} + +int arch_uprobe_exception_notify(struct notifier_block *self, + unsigned long val, void *data) +{ + return NOTIFY_DONE; +} + +static int uprobe_trap_handler(struct pt_regs *regs, unsigned int instr) +{ + unsigned long flags; + + local_irq_save(flags); + if ((instr & 0x0fffffff) == UPROBE_SWBP_INSN) + uprobe_pre_sstep_notifier(regs); + else + uprobe_post_sstep_notifier(regs); + local_irq_restore(flags); + + return 0; +} + +unsigned long uprobe_get_swbp_addr(struct pt_regs *regs) +{ + return instruction_pointer(regs); +} + +static struct undef_hook uprobes_arm_break_hook = { + .instr_mask = 0x0fffffff, + .instr_val = UPROBE_SWBP_INSN, + .cpsr_mask = MODE_MASK, + .cpsr_val = USR_MODE, + .fn = uprobe_trap_handler, +}; + +static struct undef_hook uprobes_arm_ss_hook = { + .instr_mask = 0x0fffffff, + .instr_val = UPROBE_SS_INSN, + .cpsr_mask = MODE_MASK, + .cpsr_val = USR_MODE, + .fn = uprobe_trap_handler, +}; + +int arch_uprobes_init(void) +{ + register_undef_hook(&uprobes_arm_break_hook); + register_undef_hook(&uprobes_arm_ss_hook); + + return 0; +} diff --git a/arch/arm/kernel/uprobes.h b/arch/arm/kernel/uprobes.h new file mode 100644 index 0000000..3887c19 --- /dev/null +++ b/arch/arm/kernel/uprobes.h @@ -0,0 +1,25 @@ +#ifndef __ARM_KERNEL_UPROBES_H +#define __ARM_KERNEL_UPROBES_H + +enum kprobe_insn uprobe_decode_ldmstm(kprobe_opcode_t insn, + struct arch_specific_insn *asi, + void *d); + +enum kprobe_insn decode_ldr(kprobe_opcode_t insn, + struct arch_specific_insn *asi, + void *d); + +enum kprobe_insn +decode_rd12rn16rm0rs8_rwflags(kprobe_opcode_t insn, + struct arch_specific_insn *asi, void *d); + +enum kprobe_insn +decode_wb_pc(kprobe_opcode_t insn, struct arch_specific_insn *asi, + void *d, bool alu); + +enum kprobe_insn +decode_pc_ro(kprobe_opcode_t insn, struct arch_specific_insn *asi, void *d); + +extern const union decode_item uprobes_probes_actions[]; + +#endif diff --git a/arch/powerpc/include/asm/uprobes.h b/arch/powerpc/include/asm/uprobes.h index 2301602..b532060 100644 --- a/arch/powerpc/include/asm/uprobes.h +++ b/arch/powerpc/include/asm/uprobes.h @@ -51,5 +51,4 @@ extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs); extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk); extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data); extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs); -extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs); #endif /* _ASM_UPROBES_H */ diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index 5eef2f0..6b292c3 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -139,6 +139,9 @@ extern int __weak arch_uprobes_init(void); extern void __weak arch_uprobe_write_opcode(struct arch_uprobe *auprobe, void *vaddr, uprobe_opcode_t opcode); +extern +unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, + struct pt_regs *regs); #else /* !CONFIG_UPROBES */ struct uprobes_state { }; diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 3b2f764..6c523ed 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -271,6 +271,7 @@ static int write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, unsig { struct page *old_page, *new_page; struct vm_area_struct *vma; + void *vaddr_new; int ret; retry: -- 1.8.1.2

10 years, 10 months

[PATCH] watchdog: delete mpcore_wdt driver

by Viresh Kumar

The only way this is usable is if a watchdog user binds to a particular CPU before opening this device, and remains bound to that user. But this doesn't fit the current watchdog model in linux. Interrupt request doesn't use the right API: The TWD watchdog uses a per-cpu interrupt (usually interrupt #30), and the GIC configuration should flag it as such. With this setup, request_irq() should fail, and the right API is request_percpu_irq(), together with enable_percpu_irq()/disable_percpu_irq(). Nothing ensures the userspace ioctl() will end-up kicking the watchdog on the right CPU. There are no users of this driver since a long time and it makes more sense to get rid of it as nobody is looking to fix it. In case somebody wakes up after this has been removed and needs it, please revert this driver and pick these updates (These were never pushed to mainline): http://comments.gmane.org/gmane.linux.ports.arm.kernel/245998 Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- Documentation/watchdog/watchdog-parameters.txt | 8 - arch/arm/configs/spear13xx_defconfig | 1 - drivers/watchdog/Kconfig | 9 - drivers/watchdog/Makefile | 1 - drivers/watchdog/mpcore_wdt.c | 456 ------------------------- 5 files changed, 475 deletions(-) delete mode 100644 drivers/watchdog/mpcore_wdt.c diff --git a/Documentation/watchdog/watchdog-parameters.txt b/Documentation/watchdog/watchdog-parameters.txt index 04fddbac..f9492fe 100644 --- a/Documentation/watchdog/watchdog-parameters.txt +++ b/Documentation/watchdog/watchdog-parameters.txt @@ -194,14 +194,6 @@ reset: Watchdog Interrupt/Reset Mode. 0 = interrupt, 1 = reset nowayout: Watchdog cannot be stopped once started (default=kernel config parameter) ------------------------------------------------- -mpcore_wdt: -mpcore_margin: MPcore timer margin in seconds. - (0 < mpcore_margin < 65536, default=60) -nowayout: Watchdog cannot be stopped once started - (default=kernel config parameter) -mpcore_noboot: MPcore watchdog action, set to 1 to ignore reboots, - 0 to reboot (default=0 -------------------------------------------------- mv64x60_wdt: nowayout: Watchdog cannot be stopped once started (default=kernel config parameter) diff --git a/arch/arm/configs/spear13xx_defconfig b/arch/arm/configs/spear13xx_defconfig index 1fdb826..82eaa55 100644 --- a/arch/arm/configs/spear13xx_defconfig +++ b/arch/arm/configs/spear13xx_defconfig @@ -61,7 +61,6 @@ CONFIG_GPIO_SYSFS=y CONFIG_GPIO_PL061=y # CONFIG_HWMON is not set CONFIG_WATCHDOG=y -CONFIG_MPCORE_WATCHDOG=y # CONFIG_HID_SUPPORT is not set CONFIG_USB=y # CONFIG_USB_DEVICE_CLASS is not set diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index e89fc31..0b05ee0 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -221,15 +221,6 @@ config DW_WATCHDOG To compile this driver as a module, choose M here: the module will be called dw_wdt. -config MPCORE_WATCHDOG - tristate "MPcore watchdog" - depends on HAVE_ARM_TWD - help - Watchdog timer embedded into the MPcore system. - - To compile this driver as a module, choose M here: the - module will be called mpcore_wdt. - config EP93XX_WATCHDOG tristate "EP93xx Watchdog" depends on ARCH_EP93XX diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile index a300b94..ef1e3e5 100644 --- a/drivers/watchdog/Makefile +++ b/drivers/watchdog/Makefile @@ -41,7 +41,6 @@ obj-$(CONFIG_KS8695_WATCHDOG) += ks8695_wdt.o obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o obj-$(CONFIG_DW_WATCHDOG) += dw_wdt.o -obj-$(CONFIG_MPCORE_WATCHDOG) += mpcore_wdt.o obj-$(CONFIG_EP93XX_WATCHDOG) += ep93xx_wdt.o obj-$(CONFIG_PNX4008_WATCHDOG) += pnx4008_wdt.o obj-$(CONFIG_IOP_WATCHDOG) += iop_wdt.o diff --git a/drivers/watchdog/mpcore_wdt.c b/drivers/watchdog/mpcore_wdt.c deleted file mode 100644 index 233cfad..0000000 --- a/drivers/watchdog/mpcore_wdt.c +++ /dev/null @@ -1,456 +0,0 @@ -/* - * Watchdog driver for the mpcore watchdog timer - * - * (c) Copyright 2004 ARM Limited - * - * Based on the SoftDog driver: - * (c) Copyright 1996 Alan Cox <alan(a)lxorguk.ukuu.org.uk>, - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - * - * (c) Copyright 1995 Alan Cox <alan(a)lxorguk.ukuu.org.uk> - * - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/fs.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/uaccess.h> -#include <linux/slab.h> -#include <linux/io.h> - -#include <asm/smp_twd.h> - -struct mpcore_wdt { - unsigned long timer_alive; - struct device *dev; - void __iomem *base; - int irq; - unsigned int perturb; - char expect_close; -}; - -static struct platform_device *mpcore_wdt_pdev; -static DEFINE_SPINLOCK(wdt_lock); - -#define TIMER_MARGIN 60 -static int mpcore_margin = TIMER_MARGIN; -module_param(mpcore_margin, int, 0); -MODULE_PARM_DESC(mpcore_margin, - "MPcore timer margin in seconds. (0 < mpcore_margin < 65536, default=" - __MODULE_STRING(TIMER_MARGIN) ")"); - -static bool nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, - "Watchdog cannot be stopped once started (default=" - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -#define ONLY_TESTING 0 -static int mpcore_noboot = ONLY_TESTING; -module_param(mpcore_noboot, int, 0); -MODULE_PARM_DESC(mpcore_noboot, "MPcore watchdog action, " - "set to 1 to ignore reboots, 0 to reboot (default=" - __MODULE_STRING(ONLY_TESTING) ")"); - -/* - * This is the interrupt handler. Note that we only use this - * in testing mode, so don't actually do a reboot here. - */ -static irqreturn_t mpcore_wdt_fire(int irq, void *arg) -{ - struct mpcore_wdt *wdt = arg; - - /* Check it really was our interrupt */ - if (readl(wdt->base + TWD_WDOG_INTSTAT)) { - dev_crit(wdt->dev, "Triggered - Reboot ignored\n"); - /* Clear the interrupt on the watchdog */ - writel(1, wdt->base + TWD_WDOG_INTSTAT); - return IRQ_HANDLED; - } - return IRQ_NONE; -} - -/* - * mpcore_wdt_keepalive - reload the timer - * - * Note that the spec says a DIFFERENT value must be written to the reload - * register each time. The "perturb" variable deals with this by adding 1 - * to the count every other time the function is called. - */ -static void mpcore_wdt_keepalive(struct mpcore_wdt *wdt) -{ - unsigned long count; - - spin_lock(&wdt_lock); - /* Assume prescale is set to 256 */ - count = __raw_readl(wdt->base + TWD_WDOG_COUNTER); - count = (0xFFFFFFFFU - count) * (HZ / 5); - count = (count / 256) * mpcore_margin; - - /* Reload the counter */ - writel(count + wdt->perturb, wdt->base + TWD_WDOG_LOAD); - wdt->perturb = wdt->perturb ? 0 : 1; - spin_unlock(&wdt_lock); -} - -static void mpcore_wdt_stop(struct mpcore_wdt *wdt) -{ - spin_lock(&wdt_lock); - writel(0x12345678, wdt->base + TWD_WDOG_DISABLE); - writel(0x87654321, wdt->base + TWD_WDOG_DISABLE); - writel(0x0, wdt->base + TWD_WDOG_CONTROL); - spin_unlock(&wdt_lock); -} - -static void mpcore_wdt_start(struct mpcore_wdt *wdt) -{ - dev_info(wdt->dev, "enabling watchdog\n"); - - /* This loads the count register but does NOT start the count yet */ - mpcore_wdt_keepalive(wdt); - - if (mpcore_noboot) { - /* Enable watchdog - prescale=256, watchdog mode=0, enable=1 */ - writel(0x0000FF01, wdt->base + TWD_WDOG_CONTROL); - } else { - /* Enable watchdog - prescale=256, watchdog mode=1, enable=1 */ - writel(0x0000FF09, wdt->base + TWD_WDOG_CONTROL); - } -} - -static int mpcore_wdt_set_heartbeat(int t) -{ - if (t < 0x0001 || t > 0xFFFF) - return -EINVAL; - - mpcore_margin = t; - return 0; -} - -/* - * /dev/watchdog handling - */ -static int mpcore_wdt_open(struct inode *inode, struct file *file) -{ - struct mpcore_wdt *wdt = platform_get_drvdata(mpcore_wdt_pdev); - - if (test_and_set_bit(0, &wdt->timer_alive)) - return -EBUSY; - - if (nowayout) - __module_get(THIS_MODULE); - - file->private_data = wdt; - - /* - * Activate timer - */ - mpcore_wdt_start(wdt); - - return nonseekable_open(inode, file); -} - -static int mpcore_wdt_release(struct inode *inode, struct file *file) -{ - struct mpcore_wdt *wdt = file->private_data; - - /* - * Shut off the timer. - * Lock it in if it's a module and we set nowayout - */ - if (wdt->expect_close == 42) - mpcore_wdt_stop(wdt); - else { - dev_crit(wdt->dev, - "unexpected close, not stopping watchdog!\n"); - mpcore_wdt_keepalive(wdt); - } - clear_bit(0, &wdt->timer_alive); - wdt->expect_close = 0; - return 0; -} - -static ssize_t mpcore_wdt_write(struct file *file, const char *data, - size_t len, loff_t *ppos) -{ - struct mpcore_wdt *wdt = file->private_data; - - /* - * Refresh the timer. - */ - if (len) { - if (!nowayout) { - size_t i; - - /* In case it was set long ago */ - wdt->expect_close = 0; - - for (i = 0; i != len; i++) { - char c; - - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - wdt->expect_close = 42; - } - } - mpcore_wdt_keepalive(wdt); - } - return len; -} - -static const struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | - WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE, - .identity = "MPcore Watchdog", -}; - -static long mpcore_wdt_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - struct mpcore_wdt *wdt = file->private_data; - int ret; - union { - struct watchdog_info ident; - int i; - } uarg; - - if (_IOC_DIR(cmd) && _IOC_SIZE(cmd) > sizeof(uarg)) - return -ENOTTY; - - if (_IOC_DIR(cmd) & _IOC_WRITE) { - ret = copy_from_user(&uarg, (void __user *)arg, _IOC_SIZE(cmd)); - if (ret) - return -EFAULT; - } - - switch (cmd) { - case WDIOC_GETSUPPORT: - uarg.ident = ident; - ret = 0; - break; - - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - uarg.i = 0; - ret = 0; - break; - - case WDIOC_SETOPTIONS: - ret = -EINVAL; - if (uarg.i & WDIOS_DISABLECARD) { - mpcore_wdt_stop(wdt); - ret = 0; - } - if (uarg.i & WDIOS_ENABLECARD) { - mpcore_wdt_start(wdt); - ret = 0; - } - break; - - case WDIOC_KEEPALIVE: - mpcore_wdt_keepalive(wdt); - ret = 0; - break; - - case WDIOC_SETTIMEOUT: - ret = mpcore_wdt_set_heartbeat(uarg.i); - if (ret) - break; - - mpcore_wdt_keepalive(wdt); - /* Fall */ - case WDIOC_GETTIMEOUT: - uarg.i = mpcore_margin; - ret = 0; - break; - - default: - return -ENOTTY; - } - - if (ret == 0 && _IOC_DIR(cmd) & _IOC_READ) { - ret = copy_to_user((void __user *)arg, &uarg, _IOC_SIZE(cmd)); - if (ret) - ret = -EFAULT; - } - return ret; -} - -/* - * System shutdown handler. Turn off the watchdog if we're - * restarting or halting the system. - */ -static void mpcore_wdt_shutdown(struct platform_device *pdev) -{ - struct mpcore_wdt *wdt = platform_get_drvdata(pdev); - - if (system_state == SYSTEM_RESTART || system_state == SYSTEM_HALT) - mpcore_wdt_stop(wdt); -} - -/* - * Kernel Interfaces - */ -static const struct file_operations mpcore_wdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = mpcore_wdt_write, - .unlocked_ioctl = mpcore_wdt_ioctl, - .open = mpcore_wdt_open, - .release = mpcore_wdt_release, -}; - -static struct miscdevice mpcore_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &mpcore_wdt_fops, -}; - -static int mpcore_wdt_probe(struct platform_device *pdev) -{ - struct mpcore_wdt *wdt; - struct resource *res; - int ret; - - /* We only accept one device, and it must have an id of -1 */ - if (pdev->id != -1) - return -ENODEV; - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) - return -ENODEV; - - wdt = devm_kzalloc(&pdev->dev, sizeof(struct mpcore_wdt), GFP_KERNEL); - if (!wdt) - return -ENOMEM; - - wdt->dev = &pdev->dev; - wdt->irq = platform_get_irq(pdev, 0); - if (wdt->irq >= 0) { - ret = devm_request_irq(wdt->dev, wdt->irq, mpcore_wdt_fire, 0, - "mpcore_wdt", wdt); - if (ret) { - dev_err(wdt->dev, - "cannot register IRQ%d for watchdog\n", - wdt->irq); - return ret; - } - } - - wdt->base = devm_ioremap(wdt->dev, res->start, resource_size(res)); - if (!wdt->base) - return -ENOMEM; - - mpcore_wdt_miscdev.parent = &pdev->dev; - ret = misc_register(&mpcore_wdt_miscdev); - if (ret) { - dev_err(wdt->dev, - "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - return ret; - } - - mpcore_wdt_stop(wdt); - platform_set_drvdata(pdev, wdt); - mpcore_wdt_pdev = pdev; - - return 0; -} - -static int mpcore_wdt_remove(struct platform_device *pdev) -{ - platform_set_drvdata(pdev, NULL); - - misc_deregister(&mpcore_wdt_miscdev); - - mpcore_wdt_pdev = NULL; - - return 0; -} - -#ifdef CONFIG_PM -static int mpcore_wdt_suspend(struct platform_device *pdev, pm_message_t msg) -{ - struct mpcore_wdt *wdt = platform_get_drvdata(pdev); - mpcore_wdt_stop(wdt); /* Turn the WDT off */ - return 0; -} - -static int mpcore_wdt_resume(struct platform_device *pdev) -{ - struct mpcore_wdt *wdt = platform_get_drvdata(pdev); - /* re-activate timer */ - if (test_bit(0, &wdt->timer_alive)) - mpcore_wdt_start(wdt); - return 0; -} -#else -#define mpcore_wdt_suspend NULL -#define mpcore_wdt_resume NULL -#endif - -/* work with hotplug and coldplug */ -MODULE_ALIAS("platform:mpcore_wdt"); - -static struct platform_driver mpcore_wdt_driver = { - .probe = mpcore_wdt_probe, - .remove = mpcore_wdt_remove, - .suspend = mpcore_wdt_suspend, - .resume = mpcore_wdt_resume, - .shutdown = mpcore_wdt_shutdown, - .driver = { - .owner = THIS_MODULE, - .name = "mpcore_wdt", - }, -}; - -static int __init mpcore_wdt_init(void) -{ - /* - * Check that the margin value is within it's range; - * if not reset to the default - */ - if (mpcore_wdt_set_heartbeat(mpcore_margin)) { - mpcore_wdt_set_heartbeat(TIMER_MARGIN); - pr_info("mpcore_margin value must be 0 < mpcore_margin < 65536, using %d\n", - TIMER_MARGIN); - } - - pr_info("MPcore Watchdog Timer: 0.1. mpcore_noboot=%d mpcore_margin=%d sec (nowayout= %d)\n", - mpcore_noboot, mpcore_margin, nowayout); - - return platform_driver_register(&mpcore_wdt_driver); -} - -static void __exit mpcore_wdt_exit(void) -{ - platform_driver_unregister(&mpcore_wdt_driver); -} - -module_init(mpcore_wdt_init); -module_exit(mpcore_wdt_exit); - -MODULE_AUTHOR("ARM Limited"); -MODULE_DESCRIPTION("MPcore Watchdog Device Driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); -- 1.7.12.rc2.18.g61b472e

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linaro-kernel June 2013