#ifndef _ASM_GENERIC_GPIO_H #define _ASM_GENERIC_GPIO_H #include #include #include #include #ifdef CONFIG_GPIOLIB #include #include #include /* Platforms may implement their GPIO interface with library code, * at a small performance cost for non-inlined operations and some * extra memory (for code and for per-GPIO table entries). * * While the GPIO programming interface defines valid GPIO numbers * to be in the range 0..MAX_INT, this library restricts them to the * smaller range 0..ARCH_NR_GPIOS-1. * * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is * actually an estimate of a board-specific value. */ #ifndef ARCH_NR_GPIOS #if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0 #define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO #else #define ARCH_NR_GPIOS 512 #endif #endif /* * "valid" GPIO numbers are nonnegative and may be passed to * setup routines like gpio_request(). only some valid numbers * can successfully be requested and used. * * Invalid GPIO numbers are useful for indicating no-such-GPIO in * platform data and other tables. */ static inline bool gpio_is_valid(int number) { return number >= 0 && number < ARCH_NR_GPIOS; } struct device; struct gpio; struct seq_file; struct module; struct device_node; struct gpio_desc; /* caller holds gpio_lock *OR* gpio is marked as requested */ static inline struct gpio_chip *gpio_to_chip(unsigned gpio) { return gpiod_to_chip(gpio_to_desc(gpio)); } /* Always use the library code for GPIO management calls, * or when sleeping may be involved. */ extern int gpio_request(unsigned gpio, const char *label); extern void gpio_free(unsigned gpio); static inline int gpio_direction_input(unsigned gpio) { return gpiod_direction_input(gpio_to_desc(gpio)); } static inline int gpio_direction_output(unsigned gpio, int value) { return gpiod_direction_output_raw(gpio_to_desc(gpio), value); } static inline int gpio_set_debounce(unsigned gpio, unsigned debounce) { return gpiod_set_debounce(gpio_to_desc(gpio), debounce); } static inline int gpio_get_value_cansleep(unsigned gpio) { return gpiod_get_raw_value_cansleep(gpio_to_desc(gpio)); } static inline void gpio_set_value_cansleep(unsigned gpio, int value) { return gpiod_set_raw_value_cansleep(gpio_to_desc(gpio), value); } /* A platform's code may want to inline the I/O calls when * the GPIO is constant and refers to some always-present controller, * giving direct access to chip registers and tight bitbanging loops. */ static inline int __gpio_get_value(unsigned gpio) { return gpiod_get_raw_value(gpio_to_desc(gpio)); } static inline void __gpio_set_value(unsigned gpio, int value) { return gpiod_set_raw_value(gpio_to_desc(gpio), value); } static inline int __gpio_cansleep(unsigned gpio) { return gpiod_cansleep(gpio_to_desc(gpio)); } static inline int __gpio_to_irq(unsigned gpio) { return gpiod_to_irq(gpio_to_desc(gpio)); } extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *label); extern int gpio_request_array(const struct gpio *array, size_t num); extern void gpio_free_array(const struct gpio *array, size_t num); /* * A sysfs interface can be exported by individual drivers if they want, * but more typically is configured entirely from userspace. */ static inline int gpio_export(unsigned gpio, bool direction_may_change) { return gpiod_export(gpio_to_desc(gpio), direction_may_change); } static inline int gpio_export_link(struct device *dev, const char *name, unsigned gpio) { return gpiod_export_link(dev, name, gpio_to_desc(gpio)); } static inline void gpio_unexport(unsigned gpio) { gpiod_unexport(gpio_to_desc(gpio)); } #else /* !CONFIG_GPIOLIB */ static inline bool gpio_is_valid(int number) { /* only non-negative numbers are valid */ return number >= 0; } /* platforms that don't directly support access to GPIOs through I2C, SPI, * or other blocking infrastructure can use these wrappers. */ static inline int gpio_cansleep(unsigned gpio) { return 0; } static inline int gpio_get_value_cansleep(unsigned gpio) { might_sleep(); return __gpio_get_value(gpio); } static inline void gpio_set_value_cansleep(unsigned gpio, int value) { might_sleep(); __gpio_set_value(gpio, value); } #endif /* !CONFIG_GPIOLIB */ #endif /* _ASM_GENERIC_GPIO_H */ lue='reload'/>
authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /include/dt-bindings/pinctrl
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'include/dt-bindings/pinctrl')