mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
543af5861f
We are hitting a regression with the following commit:
commit a93e7b3315
Author: Hamish Martin <hamish.martin@alliedtelesis.co.nz>
Date: Mon May 14 13:32:23 2018 +1200
uio: Prevent device destruction while fds are open
The problem is the addition of spin_lock_irqsave in uio_write. This
leads to hitting uio_write -> copy_from_user -> _copy_from_user ->
might_fault and the logs filling up with sleeping warnings.
I also noticed some uio drivers allocate memory, sleep, grab mutexes
from callouts like open() and release and uio is now doing
spin_lock_irqsave while calling them.
Reported-by: Mike Christie <mchristi@redhat.com>
CC: Hamish Martin <hamish.martin@alliedtelesis.co.nz>
Reviewed-by: Hamish Martin <hamish.martin@alliedtelesis.co.nz>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
144 lines
4.1 KiB
C
144 lines
4.1 KiB
C
/*
|
|
* include/linux/uio_driver.h
|
|
*
|
|
* Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de>
|
|
* Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
|
|
* Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de>
|
|
* Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com>
|
|
*
|
|
* Userspace IO driver.
|
|
*
|
|
* Licensed under the GPLv2 only.
|
|
*/
|
|
|
|
#ifndef _UIO_DRIVER_H_
|
|
#define _UIO_DRIVER_H_
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
struct module;
|
|
struct uio_map;
|
|
|
|
/**
|
|
* struct uio_mem - description of a UIO memory region
|
|
* @name: name of the memory region for identification
|
|
* @addr: address of the device's memory rounded to page
|
|
* size (phys_addr is used since addr can be
|
|
* logical, virtual, or physical & phys_addr_t
|
|
* should always be large enough to handle any of
|
|
* the address types)
|
|
* @offs: offset of device memory within the page
|
|
* @size: size of IO (multiple of page size)
|
|
* @memtype: type of memory addr points to
|
|
* @internal_addr: ioremap-ped version of addr, for driver internal use
|
|
* @map: for use by the UIO core only.
|
|
*/
|
|
struct uio_mem {
|
|
const char *name;
|
|
phys_addr_t addr;
|
|
unsigned long offs;
|
|
resource_size_t size;
|
|
int memtype;
|
|
void __iomem *internal_addr;
|
|
struct uio_map *map;
|
|
};
|
|
|
|
#define MAX_UIO_MAPS 5
|
|
|
|
struct uio_portio;
|
|
|
|
/**
|
|
* struct uio_port - description of a UIO port region
|
|
* @name: name of the port region for identification
|
|
* @start: start of port region
|
|
* @size: size of port region
|
|
* @porttype: type of port (see UIO_PORT_* below)
|
|
* @portio: for use by the UIO core only.
|
|
*/
|
|
struct uio_port {
|
|
const char *name;
|
|
unsigned long start;
|
|
unsigned long size;
|
|
int porttype;
|
|
struct uio_portio *portio;
|
|
};
|
|
|
|
#define MAX_UIO_PORT_REGIONS 5
|
|
|
|
struct uio_device {
|
|
struct module *owner;
|
|
struct device dev;
|
|
int minor;
|
|
atomic_t event;
|
|
struct fasync_struct *async_queue;
|
|
wait_queue_head_t wait;
|
|
struct uio_info *info;
|
|
struct mutex info_lock;
|
|
struct kobject *map_dir;
|
|
struct kobject *portio_dir;
|
|
};
|
|
|
|
/**
|
|
* struct uio_info - UIO device capabilities
|
|
* @uio_dev: the UIO device this info belongs to
|
|
* @name: device name
|
|
* @version: device driver version
|
|
* @mem: list of mappable memory regions, size==0 for end of list
|
|
* @port: list of port regions, size==0 for end of list
|
|
* @irq: interrupt number or UIO_IRQ_CUSTOM
|
|
* @irq_flags: flags for request_irq()
|
|
* @priv: optional private data
|
|
* @handler: the device's irq handler
|
|
* @mmap: mmap operation for this uio device
|
|
* @open: open operation for this uio device
|
|
* @release: release operation for this uio device
|
|
* @irqcontrol: disable/enable irqs when 0/1 is written to /dev/uioX
|
|
*/
|
|
struct uio_info {
|
|
struct uio_device *uio_dev;
|
|
const char *name;
|
|
const char *version;
|
|
struct uio_mem mem[MAX_UIO_MAPS];
|
|
struct uio_port port[MAX_UIO_PORT_REGIONS];
|
|
long irq;
|
|
unsigned long irq_flags;
|
|
void *priv;
|
|
irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
|
|
int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
|
|
int (*open)(struct uio_info *info, struct inode *inode);
|
|
int (*release)(struct uio_info *info, struct inode *inode);
|
|
int (*irqcontrol)(struct uio_info *info, s32 irq_on);
|
|
};
|
|
|
|
extern int __must_check
|
|
__uio_register_device(struct module *owner,
|
|
struct device *parent,
|
|
struct uio_info *info);
|
|
|
|
/* use a define to avoid include chaining to get THIS_MODULE */
|
|
#define uio_register_device(parent, info) \
|
|
__uio_register_device(THIS_MODULE, parent, info)
|
|
|
|
extern void uio_unregister_device(struct uio_info *info);
|
|
extern void uio_event_notify(struct uio_info *info);
|
|
|
|
/* defines for uio_info->irq */
|
|
#define UIO_IRQ_CUSTOM -1
|
|
#define UIO_IRQ_NONE 0
|
|
|
|
/* defines for uio_mem->memtype */
|
|
#define UIO_MEM_NONE 0
|
|
#define UIO_MEM_PHYS 1
|
|
#define UIO_MEM_LOGICAL 2
|
|
#define UIO_MEM_VIRTUAL 3
|
|
|
|
/* defines for uio_port->porttype */
|
|
#define UIO_PORT_NONE 0
|
|
#define UIO_PORT_X86 1
|
|
#define UIO_PORT_GPIO 2
|
|
#define UIO_PORT_OTHER 3
|
|
|
|
#endif /* _LINUX_UIO_DRIVER_H_ */
|