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7ca63cb470
For certain LLDs the sg driver can cause on oops
when the transfer length is large and not a
multiple of PAGE_SIZE.
ChangeLog:
- correct the length of the last scatter gather
list element.
- fix some printk()s that have the wrong function
name.
Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2975 lines
79 KiB
C
2975 lines
79 KiB
C
/*
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* History:
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* Started: Aug 9 by Lawrence Foard (entropy@world.std.com),
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* to allow user process control of SCSI devices.
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* Development Sponsored by Killy Corp. NY NY
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*
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* Original driver (sg.c):
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* Copyright (C) 1992 Lawrence Foard
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* Version 2 and 3 extensions to driver:
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* Copyright (C) 1998 - 2005 Douglas Gilbert
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*
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* Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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*/
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static int sg_version_num = 30534; /* 2 digits for each component */
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#define SG_VERSION_STR "3.5.34"
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/*
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* D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
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* - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
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* the kernel/module needs to be built with CONFIG_SCSI_LOGGING
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* (otherwise the macros compile to empty statements).
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/mtio.h>
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#include <linux/ioctl.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/smp_lock.h>
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#include <linux/moduleparam.h>
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#include <linux/cdev.h>
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#include <linux/seq_file.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/scatterlist.h>
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#include "scsi.h"
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/sg.h>
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#include "scsi_logging.h"
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#ifdef CONFIG_SCSI_PROC_FS
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#include <linux/proc_fs.h>
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static char *sg_version_date = "20061027";
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static int sg_proc_init(void);
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static void sg_proc_cleanup(void);
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#endif
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#define SG_ALLOW_DIO_DEF 0
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#define SG_ALLOW_DIO_CODE /* compile out by commenting this define */
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#define SG_MAX_DEVS 32768
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/*
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* Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d)
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* Then when using 32 bit integers x * m may overflow during the calculation.
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* Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m
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* calculates the same, but prevents the overflow when both m and d
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* are "small" numbers (like HZ and USER_HZ).
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* Of course an overflow is inavoidable if the result of muldiv doesn't fit
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* in 32 bits.
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*/
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#define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL))
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#define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ)
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int sg_big_buff = SG_DEF_RESERVED_SIZE;
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/* N.B. This variable is readable and writeable via
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/proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer
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of this size (or less if there is not enough memory) will be reserved
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for use by this file descriptor. [Deprecated usage: this variable is also
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readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into
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the kernel (i.e. it is not a module).] */
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static int def_reserved_size = -1; /* picks up init parameter */
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static int sg_allow_dio = SG_ALLOW_DIO_DEF;
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static int scatter_elem_sz = SG_SCATTER_SZ;
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static int scatter_elem_sz_prev = SG_SCATTER_SZ;
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#define SG_SECTOR_SZ 512
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#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
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#define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
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static int sg_add(struct class_device *, struct class_interface *);
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static void sg_remove(struct class_device *, struct class_interface *);
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static DEFINE_RWLOCK(sg_dev_arr_lock); /* Also used to lock
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file descriptor list for device */
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static struct class_interface sg_interface = {
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.add = sg_add,
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.remove = sg_remove,
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};
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typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
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unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
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unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
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unsigned bufflen; /* Size of (aggregate) data buffer */
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unsigned b_malloc_len; /* actual len malloc'ed in buffer */
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struct scatterlist *buffer;/* scatter list */
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char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */
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unsigned char cmd_opcode; /* first byte of command */
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} Sg_scatter_hold;
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struct sg_device; /* forward declarations */
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struct sg_fd;
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typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */
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struct sg_request *nextrp; /* NULL -> tail request (slist) */
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struct sg_fd *parentfp; /* NULL -> not in use */
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Sg_scatter_hold data; /* hold buffer, perhaps scatter list */
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sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */
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unsigned char sense_b[SCSI_SENSE_BUFFERSIZE];
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char res_used; /* 1 -> using reserve buffer, 0 -> not ... */
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char orphan; /* 1 -> drop on sight, 0 -> normal */
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char sg_io_owned; /* 1 -> packet belongs to SG_IO */
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volatile char done; /* 0->before bh, 1->before read, 2->read */
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} Sg_request;
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typedef struct sg_fd { /* holds the state of a file descriptor */
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struct sg_fd *nextfp; /* NULL when last opened fd on this device */
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struct sg_device *parentdp; /* owning device */
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wait_queue_head_t read_wait; /* queue read until command done */
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rwlock_t rq_list_lock; /* protect access to list in req_arr */
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int timeout; /* defaults to SG_DEFAULT_TIMEOUT */
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int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */
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Sg_scatter_hold reserve; /* buffer held for this file descriptor */
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unsigned save_scat_len; /* original length of trunc. scat. element */
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Sg_request *headrp; /* head of request slist, NULL->empty */
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struct fasync_struct *async_qp; /* used by asynchronous notification */
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Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */
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char low_dma; /* as in parent but possibly overridden to 1 */
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char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */
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volatile char closed; /* 1 -> fd closed but request(s) outstanding */
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char cmd_q; /* 1 -> allow command queuing, 0 -> don't */
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char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */
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char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */
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char mmap_called; /* 0 -> mmap() never called on this fd */
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} Sg_fd;
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typedef struct sg_device { /* holds the state of each scsi generic device */
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struct scsi_device *device;
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wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */
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int sg_tablesize; /* adapter's max scatter-gather table size */
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Sg_fd *headfp; /* first open fd belonging to this device */
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volatile char detached; /* 0->attached, 1->detached pending removal */
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volatile char exclude; /* opened for exclusive access */
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char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */
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struct gendisk *disk;
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struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */
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} Sg_device;
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static int sg_fasync(int fd, struct file *filp, int mode);
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/* tasklet or soft irq callback */
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static void sg_cmd_done(void *data, char *sense, int result, int resid);
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static int sg_start_req(Sg_request * srp);
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static void sg_finish_rem_req(Sg_request * srp);
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static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
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static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
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int tablesize);
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static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
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Sg_request * srp);
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static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
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int blocking, int read_only, Sg_request ** o_srp);
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static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
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unsigned char *cmnd, int timeout, int blocking);
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static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
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int wr_xf, int *countp, unsigned char __user **up);
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static int sg_write_xfer(Sg_request * srp);
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static int sg_read_xfer(Sg_request * srp);
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static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
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static void sg_remove_scat(Sg_scatter_hold * schp);
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static void sg_build_reserve(Sg_fd * sfp, int req_size);
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static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
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static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
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static struct page *sg_page_malloc(int rqSz, int lowDma, int *retSzp);
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static void sg_page_free(struct page *page, int size);
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static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
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static int sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
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static void __sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp);
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static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
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static Sg_request *sg_add_request(Sg_fd * sfp);
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static int sg_remove_request(Sg_fd * sfp, Sg_request * srp);
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static int sg_res_in_use(Sg_fd * sfp);
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static int sg_allow_access(unsigned char opcode, char dev_type);
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static int sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len);
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static Sg_device *sg_get_dev(int dev);
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#ifdef CONFIG_SCSI_PROC_FS
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static int sg_last_dev(void);
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#endif
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static Sg_device **sg_dev_arr = NULL;
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static int sg_dev_max;
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static int sg_nr_dev;
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#define SZ_SG_HEADER sizeof(struct sg_header)
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#define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
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#define SZ_SG_IOVEC sizeof(sg_iovec_t)
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#define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
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static int
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sg_open(struct inode *inode, struct file *filp)
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{
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int dev = iminor(inode);
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int flags = filp->f_flags;
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struct request_queue *q;
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Sg_device *sdp;
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Sg_fd *sfp;
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int res;
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int retval;
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nonseekable_open(inode, filp);
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SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
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sdp = sg_get_dev(dev);
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if ((!sdp) || (!sdp->device))
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return -ENXIO;
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if (sdp->detached)
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return -ENODEV;
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/* This driver's module count bumped by fops_get in <linux/fs.h> */
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/* Prevent the device driver from vanishing while we sleep */
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retval = scsi_device_get(sdp->device);
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if (retval)
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return retval;
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if (!((flags & O_NONBLOCK) ||
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scsi_block_when_processing_errors(sdp->device))) {
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retval = -ENXIO;
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/* we are in error recovery for this device */
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goto error_out;
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}
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if (flags & O_EXCL) {
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if (O_RDONLY == (flags & O_ACCMODE)) {
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retval = -EPERM; /* Can't lock it with read only access */
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goto error_out;
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}
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if (sdp->headfp && (flags & O_NONBLOCK)) {
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retval = -EBUSY;
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goto error_out;
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}
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res = 0;
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__wait_event_interruptible(sdp->o_excl_wait,
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((sdp->headfp || sdp->exclude) ? 0 : (sdp->exclude = 1)), res);
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if (res) {
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retval = res; /* -ERESTARTSYS because signal hit process */
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goto error_out;
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}
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} else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */
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if (flags & O_NONBLOCK) {
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retval = -EBUSY;
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goto error_out;
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}
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res = 0;
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__wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude),
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res);
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if (res) {
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retval = res; /* -ERESTARTSYS because signal hit process */
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goto error_out;
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}
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}
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if (sdp->detached) {
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retval = -ENODEV;
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goto error_out;
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}
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if (!sdp->headfp) { /* no existing opens on this device */
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sdp->sgdebug = 0;
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q = sdp->device->request_queue;
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sdp->sg_tablesize = min(q->max_hw_segments,
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q->max_phys_segments);
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}
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if ((sfp = sg_add_sfp(sdp, dev)))
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filp->private_data = sfp;
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else {
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if (flags & O_EXCL)
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sdp->exclude = 0; /* undo if error */
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retval = -ENOMEM;
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goto error_out;
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}
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return 0;
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error_out:
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scsi_device_put(sdp->device);
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return retval;
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}
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/* Following function was formerly called 'sg_close' */
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static int
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sg_release(struct inode *inode, struct file *filp)
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{
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Sg_device *sdp;
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Sg_fd *sfp;
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if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
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return -ENXIO;
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SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
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sg_fasync(-1, filp, 0); /* remove filp from async notification list */
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if (0 == sg_remove_sfp(sdp, sfp)) { /* Returns 1 when sdp gone */
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if (!sdp->detached) {
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scsi_device_put(sdp->device);
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}
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sdp->exclude = 0;
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wake_up_interruptible(&sdp->o_excl_wait);
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}
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return 0;
|
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}
|
|
|
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static ssize_t
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sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
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{
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Sg_device *sdp;
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Sg_fd *sfp;
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Sg_request *srp;
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int req_pack_id = -1;
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sg_io_hdr_t *hp;
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struct sg_header *old_hdr = NULL;
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int retval = 0;
|
|
|
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if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
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return -ENXIO;
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SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
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sdp->disk->disk_name, (int) count));
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|
|
|
if (!access_ok(VERIFY_WRITE, buf, count))
|
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return -EFAULT;
|
|
if (sfp->force_packid && (count >= SZ_SG_HEADER)) {
|
|
old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
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|
if (!old_hdr)
|
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return -ENOMEM;
|
|
if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) {
|
|
retval = -EFAULT;
|
|
goto free_old_hdr;
|
|
}
|
|
if (old_hdr->reply_len < 0) {
|
|
if (count >= SZ_SG_IO_HDR) {
|
|
sg_io_hdr_t *new_hdr;
|
|
new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL);
|
|
if (!new_hdr) {
|
|
retval = -ENOMEM;
|
|
goto free_old_hdr;
|
|
}
|
|
retval =__copy_from_user
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|
(new_hdr, buf, SZ_SG_IO_HDR);
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|
req_pack_id = new_hdr->pack_id;
|
|
kfree(new_hdr);
|
|
if (retval) {
|
|
retval = -EFAULT;
|
|
goto free_old_hdr;
|
|
}
|
|
}
|
|
} else
|
|
req_pack_id = old_hdr->pack_id;
|
|
}
|
|
srp = sg_get_rq_mark(sfp, req_pack_id);
|
|
if (!srp) { /* now wait on packet to arrive */
|
|
if (sdp->detached) {
|
|
retval = -ENODEV;
|
|
goto free_old_hdr;
|
|
}
|
|
if (filp->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
goto free_old_hdr;
|
|
}
|
|
while (1) {
|
|
retval = 0; /* following macro beats race condition */
|
|
__wait_event_interruptible(sfp->read_wait,
|
|
(sdp->detached ||
|
|
(srp = sg_get_rq_mark(sfp, req_pack_id))),
|
|
retval);
|
|
if (sdp->detached) {
|
|
retval = -ENODEV;
|
|
goto free_old_hdr;
|
|
}
|
|
if (0 == retval)
|
|
break;
|
|
|
|
/* -ERESTARTSYS as signal hit process */
|
|
goto free_old_hdr;
|
|
}
|
|
}
|
|
if (srp->header.interface_id != '\0') {
|
|
retval = sg_new_read(sfp, buf, count, srp);
|
|
goto free_old_hdr;
|
|
}
|
|
|
|
hp = &srp->header;
|
|
if (old_hdr == NULL) {
|
|
old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL);
|
|
if (! old_hdr) {
|
|
retval = -ENOMEM;
|
|
goto free_old_hdr;
|
|
}
|
|
}
|
|
memset(old_hdr, 0, SZ_SG_HEADER);
|
|
old_hdr->reply_len = (int) hp->timeout;
|
|
old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */
|
|
old_hdr->pack_id = hp->pack_id;
|
|
old_hdr->twelve_byte =
|
|
((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0;
|
|
old_hdr->target_status = hp->masked_status;
|
|
old_hdr->host_status = hp->host_status;
|
|
old_hdr->driver_status = hp->driver_status;
|
|
if ((CHECK_CONDITION & hp->masked_status) ||
|
|
(DRIVER_SENSE & hp->driver_status))
|
|
memcpy(old_hdr->sense_buffer, srp->sense_b,
|
|
sizeof (old_hdr->sense_buffer));
|
|
switch (hp->host_status) {
|
|
/* This setup of 'result' is for backward compatibility and is best
|
|
ignored by the user who should use target, host + driver status */
|
|
case DID_OK:
|
|
case DID_PASSTHROUGH:
|
|
case DID_SOFT_ERROR:
|
|
old_hdr->result = 0;
|
|
break;
|
|
case DID_NO_CONNECT:
|
|
case DID_BUS_BUSY:
|
|
case DID_TIME_OUT:
|
|
old_hdr->result = EBUSY;
|
|
break;
|
|
case DID_BAD_TARGET:
|
|
case DID_ABORT:
|
|
case DID_PARITY:
|
|
case DID_RESET:
|
|
case DID_BAD_INTR:
|
|
old_hdr->result = EIO;
|
|
break;
|
|
case DID_ERROR:
|
|
old_hdr->result = (srp->sense_b[0] == 0 &&
|
|
hp->masked_status == GOOD) ? 0 : EIO;
|
|
break;
|
|
default:
|
|
old_hdr->result = EIO;
|
|
break;
|
|
}
|
|
|
|
/* Now copy the result back to the user buffer. */
|
|
if (count >= SZ_SG_HEADER) {
|
|
if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) {
|
|
retval = -EFAULT;
|
|
goto free_old_hdr;
|
|
}
|
|
buf += SZ_SG_HEADER;
|
|
if (count > old_hdr->reply_len)
|
|
count = old_hdr->reply_len;
|
|
if (count > SZ_SG_HEADER) {
|
|
if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) {
|
|
retval = -EFAULT;
|
|
goto free_old_hdr;
|
|
}
|
|
}
|
|
} else
|
|
count = (old_hdr->result == 0) ? 0 : -EIO;
|
|
sg_finish_rem_req(srp);
|
|
retval = count;
|
|
free_old_hdr:
|
|
kfree(old_hdr);
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t
|
|
sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
|
|
{
|
|
sg_io_hdr_t *hp = &srp->header;
|
|
int err = 0;
|
|
int len;
|
|
|
|
if (count < SZ_SG_IO_HDR) {
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
hp->sb_len_wr = 0;
|
|
if ((hp->mx_sb_len > 0) && hp->sbp) {
|
|
if ((CHECK_CONDITION & hp->masked_status) ||
|
|
(DRIVER_SENSE & hp->driver_status)) {
|
|
int sb_len = SCSI_SENSE_BUFFERSIZE;
|
|
sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len;
|
|
len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */
|
|
len = (len > sb_len) ? sb_len : len;
|
|
if (copy_to_user(hp->sbp, srp->sense_b, len)) {
|
|
err = -EFAULT;
|
|
goto err_out;
|
|
}
|
|
hp->sb_len_wr = len;
|
|
}
|
|
}
|
|
if (hp->masked_status || hp->host_status || hp->driver_status)
|
|
hp->info |= SG_INFO_CHECK;
|
|
if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) {
|
|
err = -EFAULT;
|
|
goto err_out;
|
|
}
|
|
err = sg_read_xfer(srp);
|
|
err_out:
|
|
sg_finish_rem_req(srp);
|
|
return (0 == err) ? count : err;
|
|
}
|
|
|
|
static ssize_t
|
|
sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
|
|
{
|
|
int mxsize, cmd_size, k;
|
|
int input_size, blocking;
|
|
unsigned char opcode;
|
|
Sg_device *sdp;
|
|
Sg_fd *sfp;
|
|
Sg_request *srp;
|
|
struct sg_header old_hdr;
|
|
sg_io_hdr_t *hp;
|
|
unsigned char cmnd[MAX_COMMAND_SIZE];
|
|
|
|
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
|
|
return -ENXIO;
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
|
|
sdp->disk->disk_name, (int) count));
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
if (!((filp->f_flags & O_NONBLOCK) ||
|
|
scsi_block_when_processing_errors(sdp->device)))
|
|
return -ENXIO;
|
|
|
|
if (!access_ok(VERIFY_READ, buf, count))
|
|
return -EFAULT; /* protects following copy_from_user()s + get_user()s */
|
|
if (count < SZ_SG_HEADER)
|
|
return -EIO;
|
|
if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER))
|
|
return -EFAULT;
|
|
blocking = !(filp->f_flags & O_NONBLOCK);
|
|
if (old_hdr.reply_len < 0)
|
|
return sg_new_write(sfp, buf, count, blocking, 0, NULL);
|
|
if (count < (SZ_SG_HEADER + 6))
|
|
return -EIO; /* The minimum scsi command length is 6 bytes. */
|
|
|
|
if (!(srp = sg_add_request(sfp))) {
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
|
|
return -EDOM;
|
|
}
|
|
buf += SZ_SG_HEADER;
|
|
__get_user(opcode, buf);
|
|
if (sfp->next_cmd_len > 0) {
|
|
if (sfp->next_cmd_len > MAX_COMMAND_SIZE) {
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n"));
|
|
sfp->next_cmd_len = 0;
|
|
sg_remove_request(sfp, srp);
|
|
return -EIO;
|
|
}
|
|
cmd_size = sfp->next_cmd_len;
|
|
sfp->next_cmd_len = 0; /* reset so only this write() effected */
|
|
} else {
|
|
cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */
|
|
if ((opcode >= 0xc0) && old_hdr.twelve_byte)
|
|
cmd_size = 12;
|
|
}
|
|
SCSI_LOG_TIMEOUT(4, printk(
|
|
"sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
|
|
/* Determine buffer size. */
|
|
input_size = count - cmd_size;
|
|
mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len;
|
|
mxsize -= SZ_SG_HEADER;
|
|
input_size -= SZ_SG_HEADER;
|
|
if (input_size < 0) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EIO; /* User did not pass enough bytes for this command. */
|
|
}
|
|
hp = &srp->header;
|
|
hp->interface_id = '\0'; /* indicator of old interface tunnelled */
|
|
hp->cmd_len = (unsigned char) cmd_size;
|
|
hp->iovec_count = 0;
|
|
hp->mx_sb_len = 0;
|
|
if (input_size > 0)
|
|
hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ?
|
|
SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV;
|
|
else
|
|
hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
|
|
hp->dxfer_len = mxsize;
|
|
hp->dxferp = (char __user *)buf + cmd_size;
|
|
hp->sbp = NULL;
|
|
hp->timeout = old_hdr.reply_len; /* structure abuse ... */
|
|
hp->flags = input_size; /* structure abuse ... */
|
|
hp->pack_id = old_hdr.pack_id;
|
|
hp->usr_ptr = NULL;
|
|
if (__copy_from_user(cmnd, buf, cmd_size))
|
|
return -EFAULT;
|
|
/*
|
|
* SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV,
|
|
* but is is possible that the app intended SG_DXFER_TO_DEV, because there
|
|
* is a non-zero input_size, so emit a warning.
|
|
*/
|
|
if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV)
|
|
if (printk_ratelimit())
|
|
printk(KERN_WARNING
|
|
"sg_write: data in/out %d/%d bytes for SCSI command 0x%x--"
|
|
"guessing data in;\n" KERN_WARNING " "
|
|
"program %s not setting count and/or reply_len properly\n",
|
|
old_hdr.reply_len - (int)SZ_SG_HEADER,
|
|
input_size, (unsigned int) cmnd[0],
|
|
current->comm);
|
|
k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking);
|
|
return (k < 0) ? k : count;
|
|
}
|
|
|
|
static ssize_t
|
|
sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
|
|
int blocking, int read_only, Sg_request ** o_srp)
|
|
{
|
|
int k;
|
|
Sg_request *srp;
|
|
sg_io_hdr_t *hp;
|
|
unsigned char cmnd[MAX_COMMAND_SIZE];
|
|
int timeout;
|
|
unsigned long ul_timeout;
|
|
|
|
if (count < SZ_SG_IO_HDR)
|
|
return -EINVAL;
|
|
if (!access_ok(VERIFY_READ, buf, count))
|
|
return -EFAULT; /* protects following copy_from_user()s + get_user()s */
|
|
|
|
sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */
|
|
if (!(srp = sg_add_request(sfp))) {
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
|
|
return -EDOM;
|
|
}
|
|
hp = &srp->header;
|
|
if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EFAULT;
|
|
}
|
|
if (hp->interface_id != 'S') {
|
|
sg_remove_request(sfp, srp);
|
|
return -ENOSYS;
|
|
}
|
|
if (hp->flags & SG_FLAG_MMAP_IO) {
|
|
if (hp->dxfer_len > sfp->reserve.bufflen) {
|
|
sg_remove_request(sfp, srp);
|
|
return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */
|
|
}
|
|
if (hp->flags & SG_FLAG_DIRECT_IO) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */
|
|
}
|
|
if (sg_res_in_use(sfp)) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EBUSY; /* reserve buffer already being used */
|
|
}
|
|
}
|
|
ul_timeout = msecs_to_jiffies(srp->header.timeout);
|
|
timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX;
|
|
if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EMSGSIZE;
|
|
}
|
|
if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EFAULT; /* protects following copy_from_user()s + get_user()s */
|
|
}
|
|
if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EFAULT;
|
|
}
|
|
if (read_only &&
|
|
(!sg_allow_access(cmnd[0], sfp->parentdp->device->type))) {
|
|
sg_remove_request(sfp, srp);
|
|
return -EPERM;
|
|
}
|
|
k = sg_common_write(sfp, srp, cmnd, timeout, blocking);
|
|
if (k < 0)
|
|
return k;
|
|
if (o_srp)
|
|
*o_srp = srp;
|
|
return count;
|
|
}
|
|
|
|
static int
|
|
sg_common_write(Sg_fd * sfp, Sg_request * srp,
|
|
unsigned char *cmnd, int timeout, int blocking)
|
|
{
|
|
int k, data_dir;
|
|
Sg_device *sdp = sfp->parentdp;
|
|
sg_io_hdr_t *hp = &srp->header;
|
|
|
|
srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */
|
|
hp->status = 0;
|
|
hp->masked_status = 0;
|
|
hp->msg_status = 0;
|
|
hp->info = 0;
|
|
hp->host_status = 0;
|
|
hp->driver_status = 0;
|
|
hp->resid = 0;
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n",
|
|
(int) cmnd[0], (int) hp->cmd_len));
|
|
|
|
if ((k = sg_start_req(srp))) {
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
|
|
sg_finish_rem_req(srp);
|
|
return k; /* probably out of space --> ENOMEM */
|
|
}
|
|
if ((k = sg_write_xfer(srp))) {
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_common_write: write_xfer, bad address\n"));
|
|
sg_finish_rem_req(srp);
|
|
return k;
|
|
}
|
|
if (sdp->detached) {
|
|
sg_finish_rem_req(srp);
|
|
return -ENODEV;
|
|
}
|
|
|
|
switch (hp->dxfer_direction) {
|
|
case SG_DXFER_TO_FROM_DEV:
|
|
case SG_DXFER_FROM_DEV:
|
|
data_dir = DMA_FROM_DEVICE;
|
|
break;
|
|
case SG_DXFER_TO_DEV:
|
|
data_dir = DMA_TO_DEVICE;
|
|
break;
|
|
case SG_DXFER_UNKNOWN:
|
|
data_dir = DMA_BIDIRECTIONAL;
|
|
break;
|
|
default:
|
|
data_dir = DMA_NONE;
|
|
break;
|
|
}
|
|
hp->duration = jiffies_to_msecs(jiffies);
|
|
/* Now send everything of to mid-level. The next time we hear about this
|
|
packet is when sg_cmd_done() is called (i.e. a callback). */
|
|
if (scsi_execute_async(sdp->device, cmnd, hp->cmd_len, data_dir, srp->data.buffer,
|
|
hp->dxfer_len, srp->data.k_use_sg, timeout,
|
|
SG_DEFAULT_RETRIES, srp, sg_cmd_done,
|
|
GFP_ATOMIC)) {
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_common_write: scsi_execute_async failed\n"));
|
|
/*
|
|
* most likely out of mem, but could also be a bad map
|
|
*/
|
|
sg_finish_rem_req(srp);
|
|
return -ENOMEM;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sg_srp_done(Sg_request *srp, Sg_fd *sfp)
|
|
{
|
|
unsigned long iflags;
|
|
int done;
|
|
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
done = srp->done;
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return done;
|
|
}
|
|
|
|
static int
|
|
sg_ioctl(struct inode *inode, struct file *filp,
|
|
unsigned int cmd_in, unsigned long arg)
|
|
{
|
|
void __user *p = (void __user *)arg;
|
|
int __user *ip = p;
|
|
int result, val, read_only;
|
|
Sg_device *sdp;
|
|
Sg_fd *sfp;
|
|
Sg_request *srp;
|
|
unsigned long iflags;
|
|
|
|
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
|
|
return -ENXIO;
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
|
|
sdp->disk->disk_name, (int) cmd_in));
|
|
read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
|
|
|
|
switch (cmd_in) {
|
|
case SG_IO:
|
|
{
|
|
int blocking = 1; /* ignore O_NONBLOCK flag */
|
|
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
if (!scsi_block_when_processing_errors(sdp->device))
|
|
return -ENXIO;
|
|
if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR))
|
|
return -EFAULT;
|
|
result =
|
|
sg_new_write(sfp, p, SZ_SG_IO_HDR,
|
|
blocking, read_only, &srp);
|
|
if (result < 0)
|
|
return result;
|
|
srp->sg_io_owned = 1;
|
|
while (1) {
|
|
result = 0; /* following macro to beat race condition */
|
|
__wait_event_interruptible(sfp->read_wait,
|
|
(sdp->detached || sfp->closed || sg_srp_done(srp, sfp)),
|
|
result);
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
if (sfp->closed)
|
|
return 0; /* request packet dropped already */
|
|
if (0 == result)
|
|
break;
|
|
srp->orphan = 1;
|
|
return result; /* -ERESTARTSYS because signal hit process */
|
|
}
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
srp->done = 2;
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
|
|
return (result < 0) ? result : 0;
|
|
}
|
|
case SG_SET_TIMEOUT:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
if (val < 0)
|
|
return -EIO;
|
|
if (val >= MULDIV (INT_MAX, USER_HZ, HZ))
|
|
val = MULDIV (INT_MAX, USER_HZ, HZ);
|
|
sfp->timeout_user = val;
|
|
sfp->timeout = MULDIV (val, HZ, USER_HZ);
|
|
|
|
return 0;
|
|
case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */
|
|
/* strange ..., for backward compatibility */
|
|
return sfp->timeout_user;
|
|
case SG_SET_FORCE_LOW_DMA:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
if (val) {
|
|
sfp->low_dma = 1;
|
|
if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
|
|
val = (int) sfp->reserve.bufflen;
|
|
sg_remove_scat(&sfp->reserve);
|
|
sg_build_reserve(sfp, val);
|
|
}
|
|
} else {
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
sfp->low_dma = sdp->device->host->unchecked_isa_dma;
|
|
}
|
|
return 0;
|
|
case SG_GET_LOW_DMA:
|
|
return put_user((int) sfp->low_dma, ip);
|
|
case SG_GET_SCSI_ID:
|
|
if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t)))
|
|
return -EFAULT;
|
|
else {
|
|
sg_scsi_id_t __user *sg_idp = p;
|
|
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
__put_user((int) sdp->device->host->host_no,
|
|
&sg_idp->host_no);
|
|
__put_user((int) sdp->device->channel,
|
|
&sg_idp->channel);
|
|
__put_user((int) sdp->device->id, &sg_idp->scsi_id);
|
|
__put_user((int) sdp->device->lun, &sg_idp->lun);
|
|
__put_user((int) sdp->device->type, &sg_idp->scsi_type);
|
|
__put_user((short) sdp->device->host->cmd_per_lun,
|
|
&sg_idp->h_cmd_per_lun);
|
|
__put_user((short) sdp->device->queue_depth,
|
|
&sg_idp->d_queue_depth);
|
|
__put_user(0, &sg_idp->unused[0]);
|
|
__put_user(0, &sg_idp->unused[1]);
|
|
return 0;
|
|
}
|
|
case SG_SET_FORCE_PACK_ID:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
sfp->force_packid = val ? 1 : 0;
|
|
return 0;
|
|
case SG_GET_PACK_ID:
|
|
if (!access_ok(VERIFY_WRITE, ip, sizeof (int)))
|
|
return -EFAULT;
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
for (srp = sfp->headrp; srp; srp = srp->nextrp) {
|
|
if ((1 == srp->done) && (!srp->sg_io_owned)) {
|
|
read_unlock_irqrestore(&sfp->rq_list_lock,
|
|
iflags);
|
|
__put_user(srp->header.pack_id, ip);
|
|
return 0;
|
|
}
|
|
}
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
__put_user(-1, ip);
|
|
return 0;
|
|
case SG_GET_NUM_WAITING:
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) {
|
|
if ((1 == srp->done) && (!srp->sg_io_owned))
|
|
++val;
|
|
}
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return put_user(val, ip);
|
|
case SG_GET_SG_TABLESIZE:
|
|
return put_user(sdp->sg_tablesize, ip);
|
|
case SG_SET_RESERVED_SIZE:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
if (val < 0)
|
|
return -EINVAL;
|
|
if (val != sfp->reserve.bufflen) {
|
|
if (sg_res_in_use(sfp) || sfp->mmap_called)
|
|
return -EBUSY;
|
|
sg_remove_scat(&sfp->reserve);
|
|
sg_build_reserve(sfp, val);
|
|
}
|
|
return 0;
|
|
case SG_GET_RESERVED_SIZE:
|
|
val = (int) sfp->reserve.bufflen;
|
|
return put_user(val, ip);
|
|
case SG_SET_COMMAND_Q:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
sfp->cmd_q = val ? 1 : 0;
|
|
return 0;
|
|
case SG_GET_COMMAND_Q:
|
|
return put_user((int) sfp->cmd_q, ip);
|
|
case SG_SET_KEEP_ORPHAN:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
sfp->keep_orphan = val;
|
|
return 0;
|
|
case SG_GET_KEEP_ORPHAN:
|
|
return put_user((int) sfp->keep_orphan, ip);
|
|
case SG_NEXT_CMD_LEN:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
sfp->next_cmd_len = (val > 0) ? val : 0;
|
|
return 0;
|
|
case SG_GET_VERSION_NUM:
|
|
return put_user(sg_version_num, ip);
|
|
case SG_GET_ACCESS_COUNT:
|
|
/* faked - we don't have a real access count anymore */
|
|
val = (sdp->device ? 1 : 0);
|
|
return put_user(val, ip);
|
|
case SG_GET_REQUEST_TABLE:
|
|
if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE))
|
|
return -EFAULT;
|
|
else {
|
|
sg_req_info_t *rinfo;
|
|
unsigned int ms;
|
|
|
|
rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE,
|
|
GFP_KERNEL);
|
|
if (!rinfo)
|
|
return -ENOMEM;
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE;
|
|
++val, srp = srp ? srp->nextrp : srp) {
|
|
memset(&rinfo[val], 0, SZ_SG_REQ_INFO);
|
|
if (srp) {
|
|
rinfo[val].req_state = srp->done + 1;
|
|
rinfo[val].problem =
|
|
srp->header.masked_status &
|
|
srp->header.host_status &
|
|
srp->header.driver_status;
|
|
if (srp->done)
|
|
rinfo[val].duration =
|
|
srp->header.duration;
|
|
else {
|
|
ms = jiffies_to_msecs(jiffies);
|
|
rinfo[val].duration =
|
|
(ms > srp->header.duration) ?
|
|
(ms - srp->header.duration) : 0;
|
|
}
|
|
rinfo[val].orphan = srp->orphan;
|
|
rinfo[val].sg_io_owned =
|
|
srp->sg_io_owned;
|
|
rinfo[val].pack_id =
|
|
srp->header.pack_id;
|
|
rinfo[val].usr_ptr =
|
|
srp->header.usr_ptr;
|
|
}
|
|
}
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
result = __copy_to_user(p, rinfo,
|
|
SZ_SG_REQ_INFO * SG_MAX_QUEUE);
|
|
result = result ? -EFAULT : 0;
|
|
kfree(rinfo);
|
|
return result;
|
|
}
|
|
case SG_EMULATED_HOST:
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
return put_user(sdp->device->host->hostt->emulated, ip);
|
|
case SG_SCSI_RESET:
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
if (filp->f_flags & O_NONBLOCK) {
|
|
if (scsi_host_in_recovery(sdp->device->host))
|
|
return -EBUSY;
|
|
} else if (!scsi_block_when_processing_errors(sdp->device))
|
|
return -EBUSY;
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
if (SG_SCSI_RESET_NOTHING == val)
|
|
return 0;
|
|
switch (val) {
|
|
case SG_SCSI_RESET_DEVICE:
|
|
val = SCSI_TRY_RESET_DEVICE;
|
|
break;
|
|
case SG_SCSI_RESET_BUS:
|
|
val = SCSI_TRY_RESET_BUS;
|
|
break;
|
|
case SG_SCSI_RESET_HOST:
|
|
val = SCSI_TRY_RESET_HOST;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
|
|
return -EACCES;
|
|
return (scsi_reset_provider(sdp->device, val) ==
|
|
SUCCESS) ? 0 : -EIO;
|
|
case SCSI_IOCTL_SEND_COMMAND:
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
if (read_only) {
|
|
unsigned char opcode = WRITE_6;
|
|
Scsi_Ioctl_Command __user *siocp = p;
|
|
|
|
if (copy_from_user(&opcode, siocp->data, 1))
|
|
return -EFAULT;
|
|
if (!sg_allow_access(opcode, sdp->device->type))
|
|
return -EPERM;
|
|
}
|
|
return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
|
|
case SG_SET_DEBUG:
|
|
result = get_user(val, ip);
|
|
if (result)
|
|
return result;
|
|
sdp->sgdebug = (char) val;
|
|
return 0;
|
|
case SCSI_IOCTL_GET_IDLUN:
|
|
case SCSI_IOCTL_GET_BUS_NUMBER:
|
|
case SCSI_IOCTL_PROBE_HOST:
|
|
case SG_GET_TRANSFORM:
|
|
if (sdp->detached)
|
|
return -ENODEV;
|
|
return scsi_ioctl(sdp->device, cmd_in, p);
|
|
default:
|
|
if (read_only)
|
|
return -EPERM; /* don't know so take safe approach */
|
|
return scsi_ioctl(sdp->device, cmd_in, p);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
|
|
{
|
|
Sg_device *sdp;
|
|
Sg_fd *sfp;
|
|
struct scsi_device *sdev;
|
|
|
|
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
|
|
return -ENXIO;
|
|
|
|
sdev = sdp->device;
|
|
if (sdev->host->hostt->compat_ioctl) {
|
|
int ret;
|
|
|
|
ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
#endif
|
|
|
|
static unsigned int
|
|
sg_poll(struct file *filp, poll_table * wait)
|
|
{
|
|
unsigned int res = 0;
|
|
Sg_device *sdp;
|
|
Sg_fd *sfp;
|
|
Sg_request *srp;
|
|
int count = 0;
|
|
unsigned long iflags;
|
|
|
|
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))
|
|
|| sfp->closed)
|
|
return POLLERR;
|
|
poll_wait(filp, &sfp->read_wait, wait);
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
for (srp = sfp->headrp; srp; srp = srp->nextrp) {
|
|
/* if any read waiting, flag it */
|
|
if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned))
|
|
res = POLLIN | POLLRDNORM;
|
|
++count;
|
|
}
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
|
|
if (sdp->detached)
|
|
res |= POLLHUP;
|
|
else if (!sfp->cmd_q) {
|
|
if (0 == count)
|
|
res |= POLLOUT | POLLWRNORM;
|
|
} else if (count < SG_MAX_QUEUE)
|
|
res |= POLLOUT | POLLWRNORM;
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
|
|
sdp->disk->disk_name, (int) res));
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
sg_fasync(int fd, struct file *filp, int mode)
|
|
{
|
|
int retval;
|
|
Sg_device *sdp;
|
|
Sg_fd *sfp;
|
|
|
|
if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
|
|
return -ENXIO;
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
|
|
sdp->disk->disk_name, mode));
|
|
|
|
retval = fasync_helper(fd, filp, mode, &sfp->async_qp);
|
|
return (retval < 0) ? retval : 0;
|
|
}
|
|
|
|
static struct page *
|
|
sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
|
|
{
|
|
Sg_fd *sfp;
|
|
struct page *page = NOPAGE_SIGBUS;
|
|
unsigned long offset, len, sa;
|
|
Sg_scatter_hold *rsv_schp;
|
|
struct scatterlist *sg;
|
|
int k;
|
|
|
|
if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data)))
|
|
return page;
|
|
rsv_schp = &sfp->reserve;
|
|
offset = addr - vma->vm_start;
|
|
if (offset >= rsv_schp->bufflen)
|
|
return page;
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_vma_nopage: offset=%lu, scatg=%d\n",
|
|
offset, rsv_schp->k_use_sg));
|
|
sg = rsv_schp->buffer;
|
|
sa = vma->vm_start;
|
|
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
|
|
++k, ++sg) {
|
|
len = vma->vm_end - sa;
|
|
len = (len < sg->length) ? len : sg->length;
|
|
if (offset < len) {
|
|
page = virt_to_page(page_address(sg->page) + offset);
|
|
get_page(page); /* increment page count */
|
|
break;
|
|
}
|
|
sa += len;
|
|
offset -= len;
|
|
}
|
|
|
|
if (type)
|
|
*type = VM_FAULT_MINOR;
|
|
return page;
|
|
}
|
|
|
|
static struct vm_operations_struct sg_mmap_vm_ops = {
|
|
.nopage = sg_vma_nopage,
|
|
};
|
|
|
|
static int
|
|
sg_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
Sg_fd *sfp;
|
|
unsigned long req_sz, len, sa;
|
|
Sg_scatter_hold *rsv_schp;
|
|
int k;
|
|
struct scatterlist *sg;
|
|
|
|
if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
|
|
return -ENXIO;
|
|
req_sz = vma->vm_end - vma->vm_start;
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
|
|
(void *) vma->vm_start, (int) req_sz));
|
|
if (vma->vm_pgoff)
|
|
return -EINVAL; /* want no offset */
|
|
rsv_schp = &sfp->reserve;
|
|
if (req_sz > rsv_schp->bufflen)
|
|
return -ENOMEM; /* cannot map more than reserved buffer */
|
|
|
|
sa = vma->vm_start;
|
|
sg = rsv_schp->buffer;
|
|
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
|
|
++k, ++sg) {
|
|
len = vma->vm_end - sa;
|
|
len = (len < sg->length) ? len : sg->length;
|
|
sa += len;
|
|
}
|
|
|
|
sfp->mmap_called = 1;
|
|
vma->vm_flags |= VM_RESERVED;
|
|
vma->vm_private_data = sfp;
|
|
vma->vm_ops = &sg_mmap_vm_ops;
|
|
return 0;
|
|
}
|
|
|
|
/* This function is a "bottom half" handler that is called by the
|
|
* mid level when a command is completed (or has failed). */
|
|
static void
|
|
sg_cmd_done(void *data, char *sense, int result, int resid)
|
|
{
|
|
Sg_request *srp = data;
|
|
Sg_device *sdp = NULL;
|
|
Sg_fd *sfp;
|
|
unsigned long iflags;
|
|
unsigned int ms;
|
|
|
|
if (NULL == srp) {
|
|
printk(KERN_ERR "sg_cmd_done: NULL request\n");
|
|
return;
|
|
}
|
|
sfp = srp->parentfp;
|
|
if (sfp)
|
|
sdp = sfp->parentdp;
|
|
if ((NULL == sdp) || sdp->detached) {
|
|
printk(KERN_INFO "sg_cmd_done: device detached\n");
|
|
return;
|
|
}
|
|
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
|
|
sdp->disk->disk_name, srp->header.pack_id, result));
|
|
srp->header.resid = resid;
|
|
ms = jiffies_to_msecs(jiffies);
|
|
srp->header.duration = (ms > srp->header.duration) ?
|
|
(ms - srp->header.duration) : 0;
|
|
if (0 != result) {
|
|
struct scsi_sense_hdr sshdr;
|
|
|
|
memcpy(srp->sense_b, sense, sizeof (srp->sense_b));
|
|
srp->header.status = 0xff & result;
|
|
srp->header.masked_status = status_byte(result);
|
|
srp->header.msg_status = msg_byte(result);
|
|
srp->header.host_status = host_byte(result);
|
|
srp->header.driver_status = driver_byte(result);
|
|
if ((sdp->sgdebug > 0) &&
|
|
((CHECK_CONDITION == srp->header.masked_status) ||
|
|
(COMMAND_TERMINATED == srp->header.masked_status)))
|
|
__scsi_print_sense("sg_cmd_done", sense,
|
|
SCSI_SENSE_BUFFERSIZE);
|
|
|
|
/* Following if statement is a patch supplied by Eric Youngdale */
|
|
if (driver_byte(result) != 0
|
|
&& scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr)
|
|
&& !scsi_sense_is_deferred(&sshdr)
|
|
&& sshdr.sense_key == UNIT_ATTENTION
|
|
&& sdp->device->removable) {
|
|
/* Detected possible disc change. Set the bit - this */
|
|
/* may be used if there are filesystems using this device */
|
|
sdp->device->changed = 1;
|
|
}
|
|
}
|
|
/* Rely on write phase to clean out srp status values, so no "else" */
|
|
|
|
if (sfp->closed) { /* whoops this fd already released, cleanup */
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, freeing ...\n"));
|
|
sg_finish_rem_req(srp);
|
|
srp = NULL;
|
|
if (NULL == sfp->headrp) {
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_cmd_done: already closed, final cleanup\n"));
|
|
if (0 == sg_remove_sfp(sdp, sfp)) { /* device still present */
|
|
scsi_device_put(sdp->device);
|
|
}
|
|
sfp = NULL;
|
|
}
|
|
} else if (srp && srp->orphan) {
|
|
if (sfp->keep_orphan)
|
|
srp->sg_io_owned = 0;
|
|
else {
|
|
sg_finish_rem_req(srp);
|
|
srp = NULL;
|
|
}
|
|
}
|
|
if (sfp && srp) {
|
|
/* Now wake up any sg_read() that is waiting for this packet. */
|
|
kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN);
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
srp->done = 1;
|
|
wake_up_interruptible(&sfp->read_wait);
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
}
|
|
}
|
|
|
|
static struct file_operations sg_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = sg_read,
|
|
.write = sg_write,
|
|
.poll = sg_poll,
|
|
.ioctl = sg_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = sg_compat_ioctl,
|
|
#endif
|
|
.open = sg_open,
|
|
.mmap = sg_mmap,
|
|
.release = sg_release,
|
|
.fasync = sg_fasync,
|
|
};
|
|
|
|
static struct class *sg_sysfs_class;
|
|
|
|
static int sg_sysfs_valid = 0;
|
|
|
|
static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
|
|
{
|
|
struct request_queue *q = scsidp->request_queue;
|
|
Sg_device *sdp;
|
|
unsigned long iflags;
|
|
void *old_sg_dev_arr = NULL;
|
|
int k, error;
|
|
|
|
sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL);
|
|
if (!sdp) {
|
|
printk(KERN_WARNING "kmalloc Sg_device failure\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
write_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
|
|
Sg_device **tmp_da;
|
|
int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
|
|
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
|
|
tmp_da = kzalloc(tmp_dev_max * sizeof(Sg_device *), GFP_KERNEL);
|
|
if (unlikely(!tmp_da))
|
|
goto expand_failed;
|
|
|
|
write_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
|
|
old_sg_dev_arr = sg_dev_arr;
|
|
sg_dev_arr = tmp_da;
|
|
sg_dev_max = tmp_dev_max;
|
|
}
|
|
|
|
for (k = 0; k < sg_dev_max; k++)
|
|
if (!sg_dev_arr[k])
|
|
break;
|
|
if (unlikely(k >= SG_MAX_DEVS))
|
|
goto overflow;
|
|
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
|
|
sprintf(disk->disk_name, "sg%d", k);
|
|
disk->first_minor = k;
|
|
sdp->disk = disk;
|
|
sdp->device = scsidp;
|
|
init_waitqueue_head(&sdp->o_excl_wait);
|
|
sdp->sg_tablesize = min(q->max_hw_segments, q->max_phys_segments);
|
|
|
|
sg_nr_dev++;
|
|
sg_dev_arr[k] = sdp;
|
|
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
error = k;
|
|
|
|
out:
|
|
if (error < 0)
|
|
kfree(sdp);
|
|
kfree(old_sg_dev_arr);
|
|
return error;
|
|
|
|
expand_failed:
|
|
printk(KERN_WARNING "sg_alloc: device array cannot be resized\n");
|
|
error = -ENOMEM;
|
|
goto out;
|
|
|
|
overflow:
|
|
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
sdev_printk(KERN_WARNING, scsidp,
|
|
"Unable to attach sg device type=%d, minor "
|
|
"number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
|
|
error = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
static int
|
|
sg_add(struct class_device *cl_dev, struct class_interface *cl_intf)
|
|
{
|
|
struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
|
|
struct gendisk *disk;
|
|
Sg_device *sdp = NULL;
|
|
struct cdev * cdev = NULL;
|
|
int error, k;
|
|
unsigned long iflags;
|
|
|
|
disk = alloc_disk(1);
|
|
if (!disk) {
|
|
printk(KERN_WARNING "alloc_disk failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
disk->major = SCSI_GENERIC_MAJOR;
|
|
|
|
error = -ENOMEM;
|
|
cdev = cdev_alloc();
|
|
if (!cdev) {
|
|
printk(KERN_WARNING "cdev_alloc failed\n");
|
|
goto out;
|
|
}
|
|
cdev->owner = THIS_MODULE;
|
|
cdev->ops = &sg_fops;
|
|
|
|
error = sg_alloc(disk, scsidp);
|
|
if (error < 0) {
|
|
printk(KERN_WARNING "sg_alloc failed\n");
|
|
goto out;
|
|
}
|
|
k = error;
|
|
sdp = sg_dev_arr[k];
|
|
|
|
error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, k), 1);
|
|
if (error)
|
|
goto cdev_add_err;
|
|
|
|
sdp->cdev = cdev;
|
|
if (sg_sysfs_valid) {
|
|
struct class_device * sg_class_member;
|
|
|
|
sg_class_member = class_device_create(sg_sysfs_class, NULL,
|
|
MKDEV(SCSI_GENERIC_MAJOR, k),
|
|
cl_dev->dev, "%s",
|
|
disk->disk_name);
|
|
if (IS_ERR(sg_class_member))
|
|
printk(KERN_WARNING "sg_add: "
|
|
"class_device_create failed\n");
|
|
class_set_devdata(sg_class_member, sdp);
|
|
error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
|
|
&sg_class_member->kobj, "generic");
|
|
if (error)
|
|
printk(KERN_ERR "sg_add: unable to make symlink "
|
|
"'generic' back to sg%d\n", k);
|
|
} else
|
|
printk(KERN_WARNING "sg_add: sg_sys INvalid\n");
|
|
|
|
sdev_printk(KERN_NOTICE, scsidp,
|
|
"Attached scsi generic sg%d type %d\n", k,scsidp->type);
|
|
|
|
return 0;
|
|
|
|
cdev_add_err:
|
|
write_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
kfree(sg_dev_arr[k]);
|
|
sg_dev_arr[k] = NULL;
|
|
sg_nr_dev--;
|
|
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
|
|
out:
|
|
put_disk(disk);
|
|
if (cdev)
|
|
cdev_del(cdev);
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
sg_remove(struct class_device *cl_dev, struct class_interface *cl_intf)
|
|
{
|
|
struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
|
|
Sg_device *sdp = NULL;
|
|
unsigned long iflags;
|
|
Sg_fd *sfp;
|
|
Sg_fd *tsfp;
|
|
Sg_request *srp;
|
|
Sg_request *tsrp;
|
|
int k, delay;
|
|
|
|
if (NULL == sg_dev_arr)
|
|
return;
|
|
delay = 0;
|
|
write_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
for (k = 0; k < sg_dev_max; k++) {
|
|
sdp = sg_dev_arr[k];
|
|
if ((NULL == sdp) || (sdp->device != scsidp))
|
|
continue; /* dirty but lowers nesting */
|
|
if (sdp->headfp) {
|
|
sdp->detached = 1;
|
|
for (sfp = sdp->headfp; sfp; sfp = tsfp) {
|
|
tsfp = sfp->nextfp;
|
|
for (srp = sfp->headrp; srp; srp = tsrp) {
|
|
tsrp = srp->nextrp;
|
|
if (sfp->closed || (0 == sg_srp_done(srp, sfp)))
|
|
sg_finish_rem_req(srp);
|
|
}
|
|
if (sfp->closed) {
|
|
scsi_device_put(sdp->device);
|
|
__sg_remove_sfp(sdp, sfp);
|
|
} else {
|
|
delay = 1;
|
|
wake_up_interruptible(&sfp->read_wait);
|
|
kill_fasync(&sfp->async_qp, SIGPOLL,
|
|
POLL_HUP);
|
|
}
|
|
}
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d, dirty\n", k));
|
|
if (NULL == sdp->headfp) {
|
|
sg_dev_arr[k] = NULL;
|
|
}
|
|
} else { /* nothing active, simple case */
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_remove: dev=%d\n", k));
|
|
sg_dev_arr[k] = NULL;
|
|
}
|
|
sg_nr_dev--;
|
|
break;
|
|
}
|
|
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
|
|
if (sdp) {
|
|
sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
|
|
class_device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, k));
|
|
cdev_del(sdp->cdev);
|
|
sdp->cdev = NULL;
|
|
put_disk(sdp->disk);
|
|
sdp->disk = NULL;
|
|
if (NULL == sdp->headfp)
|
|
kfree((char *) sdp);
|
|
}
|
|
|
|
if (delay)
|
|
msleep(10); /* dirty detach so delay device destruction */
|
|
}
|
|
|
|
module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR);
|
|
module_param_named(def_reserved_size, def_reserved_size, int,
|
|
S_IRUGO | S_IWUSR);
|
|
module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR);
|
|
|
|
MODULE_AUTHOR("Douglas Gilbert");
|
|
MODULE_DESCRIPTION("SCSI generic (sg) driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(SG_VERSION_STR);
|
|
MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR);
|
|
|
|
MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element "
|
|
"size (default: max(SG_SCATTER_SZ, PAGE_SIZE))");
|
|
MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
|
|
MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
|
|
|
|
static int __init
|
|
init_sg(void)
|
|
{
|
|
int rc;
|
|
|
|
if (scatter_elem_sz < PAGE_SIZE) {
|
|
scatter_elem_sz = PAGE_SIZE;
|
|
scatter_elem_sz_prev = scatter_elem_sz;
|
|
}
|
|
if (def_reserved_size >= 0)
|
|
sg_big_buff = def_reserved_size;
|
|
else
|
|
def_reserved_size = sg_big_buff;
|
|
|
|
rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
|
|
SG_MAX_DEVS, "sg");
|
|
if (rc)
|
|
return rc;
|
|
sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic");
|
|
if ( IS_ERR(sg_sysfs_class) ) {
|
|
rc = PTR_ERR(sg_sysfs_class);
|
|
goto err_out;
|
|
}
|
|
sg_sysfs_valid = 1;
|
|
rc = scsi_register_interface(&sg_interface);
|
|
if (0 == rc) {
|
|
#ifdef CONFIG_SCSI_PROC_FS
|
|
sg_proc_init();
|
|
#endif /* CONFIG_SCSI_PROC_FS */
|
|
return 0;
|
|
}
|
|
class_destroy(sg_sysfs_class);
|
|
err_out:
|
|
unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS);
|
|
return rc;
|
|
}
|
|
|
|
static void __exit
|
|
exit_sg(void)
|
|
{
|
|
#ifdef CONFIG_SCSI_PROC_FS
|
|
sg_proc_cleanup();
|
|
#endif /* CONFIG_SCSI_PROC_FS */
|
|
scsi_unregister_interface(&sg_interface);
|
|
class_destroy(sg_sysfs_class);
|
|
sg_sysfs_valid = 0;
|
|
unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0),
|
|
SG_MAX_DEVS);
|
|
kfree((char *)sg_dev_arr);
|
|
sg_dev_arr = NULL;
|
|
sg_dev_max = 0;
|
|
}
|
|
|
|
static int
|
|
sg_start_req(Sg_request * srp)
|
|
{
|
|
int res;
|
|
Sg_fd *sfp = srp->parentfp;
|
|
sg_io_hdr_t *hp = &srp->header;
|
|
int dxfer_len = (int) hp->dxfer_len;
|
|
int dxfer_dir = hp->dxfer_direction;
|
|
Sg_scatter_hold *req_schp = &srp->data;
|
|
Sg_scatter_hold *rsv_schp = &sfp->reserve;
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_start_req: dxfer_len=%d\n", dxfer_len));
|
|
if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE))
|
|
return 0;
|
|
if (sg_allow_dio && (hp->flags & SG_FLAG_DIRECT_IO) &&
|
|
(dxfer_dir != SG_DXFER_UNKNOWN) && (0 == hp->iovec_count) &&
|
|
(!sfp->parentdp->device->host->unchecked_isa_dma)) {
|
|
res = sg_build_direct(srp, sfp, dxfer_len);
|
|
if (res <= 0) /* -ve -> error, 0 -> done, 1 -> try indirect */
|
|
return res;
|
|
}
|
|
if ((!sg_res_in_use(sfp)) && (dxfer_len <= rsv_schp->bufflen))
|
|
sg_link_reserve(sfp, srp, dxfer_len);
|
|
else {
|
|
res = sg_build_indirect(req_schp, sfp, dxfer_len);
|
|
if (res) {
|
|
sg_remove_scat(req_schp);
|
|
return res;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
sg_finish_rem_req(Sg_request * srp)
|
|
{
|
|
Sg_fd *sfp = srp->parentfp;
|
|
Sg_scatter_hold *req_schp = &srp->data;
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
|
|
if (srp->res_used)
|
|
sg_unlink_reserve(sfp, srp);
|
|
else
|
|
sg_remove_scat(req_schp);
|
|
sg_remove_request(sfp, srp);
|
|
}
|
|
|
|
static int
|
|
sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize)
|
|
{
|
|
int sg_bufflen = tablesize * sizeof(struct scatterlist);
|
|
gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
|
|
|
|
/*
|
|
* TODO: test without low_dma, we should not need it since
|
|
* the block layer will bounce the buffer for us
|
|
*
|
|
* XXX(hch): we shouldn't need GFP_DMA for the actual S/G list.
|
|
*/
|
|
if (sfp->low_dma)
|
|
gfp_flags |= GFP_DMA;
|
|
schp->buffer = kzalloc(sg_bufflen, gfp_flags);
|
|
if (!schp->buffer)
|
|
return -ENOMEM;
|
|
schp->sglist_len = sg_bufflen;
|
|
return tablesize; /* number of scat_gath elements allocated */
|
|
}
|
|
|
|
#ifdef SG_ALLOW_DIO_CODE
|
|
/* vvvvvvvv following code borrowed from st driver's direct IO vvvvvvvvv */
|
|
/* TODO: hopefully we can use the generic block layer code */
|
|
|
|
/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
|
|
- mapping of all pages not successful
|
|
(i.e., either completely successful or fails)
|
|
*/
|
|
static int
|
|
st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
|
|
unsigned long uaddr, size_t count, int rw)
|
|
{
|
|
unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
|
unsigned long start = uaddr >> PAGE_SHIFT;
|
|
const int nr_pages = end - start;
|
|
int res, i, j;
|
|
struct page **pages;
|
|
|
|
/* User attempted Overflow! */
|
|
if ((uaddr + count) < uaddr)
|
|
return -EINVAL;
|
|
|
|
/* Too big */
|
|
if (nr_pages > max_pages)
|
|
return -ENOMEM;
|
|
|
|
/* Hmm? */
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
if ((pages = kmalloc(max_pages * sizeof(*pages), GFP_ATOMIC)) == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Try to fault in all of the necessary pages */
|
|
down_read(¤t->mm->mmap_sem);
|
|
/* rw==READ means read from drive, write into memory area */
|
|
res = get_user_pages(
|
|
current,
|
|
current->mm,
|
|
uaddr,
|
|
nr_pages,
|
|
rw == READ,
|
|
0, /* don't force */
|
|
pages,
|
|
NULL);
|
|
up_read(¤t->mm->mmap_sem);
|
|
|
|
/* Errors and no page mapped should return here */
|
|
if (res < nr_pages)
|
|
goto out_unmap;
|
|
|
|
for (i=0; i < nr_pages; i++) {
|
|
/* FIXME: flush superflous for rw==READ,
|
|
* probably wrong function for rw==WRITE
|
|
*/
|
|
flush_dcache_page(pages[i]);
|
|
/* ?? Is locking needed? I don't think so */
|
|
/* if (TestSetPageLocked(pages[i]))
|
|
goto out_unlock; */
|
|
}
|
|
|
|
sgl[0].page = pages[0];
|
|
sgl[0].offset = uaddr & ~PAGE_MASK;
|
|
if (nr_pages > 1) {
|
|
sgl[0].length = PAGE_SIZE - sgl[0].offset;
|
|
count -= sgl[0].length;
|
|
for (i=1; i < nr_pages ; i++) {
|
|
sgl[i].page = pages[i];
|
|
sgl[i].length = count < PAGE_SIZE ? count : PAGE_SIZE;
|
|
count -= PAGE_SIZE;
|
|
}
|
|
}
|
|
else {
|
|
sgl[0].length = count;
|
|
}
|
|
|
|
kfree(pages);
|
|
return nr_pages;
|
|
|
|
out_unmap:
|
|
if (res > 0) {
|
|
for (j=0; j < res; j++)
|
|
page_cache_release(pages[j]);
|
|
res = 0;
|
|
}
|
|
kfree(pages);
|
|
return res;
|
|
}
|
|
|
|
|
|
/* And unmap them... */
|
|
static int
|
|
st_unmap_user_pages(struct scatterlist *sgl, const unsigned int nr_pages,
|
|
int dirtied)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < nr_pages; i++) {
|
|
struct page *page = sgl[i].page;
|
|
|
|
if (dirtied)
|
|
SetPageDirty(page);
|
|
/* unlock_page(page); */
|
|
/* FIXME: cache flush missing for rw==READ
|
|
* FIXME: call the correct reference counting function
|
|
*/
|
|
page_cache_release(page);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ^^^^^^^^ above code borrowed from st driver's direct IO ^^^^^^^^^ */
|
|
#endif
|
|
|
|
|
|
/* Returns: -ve -> error, 0 -> done, 1 -> try indirect */
|
|
static int
|
|
sg_build_direct(Sg_request * srp, Sg_fd * sfp, int dxfer_len)
|
|
{
|
|
#ifdef SG_ALLOW_DIO_CODE
|
|
sg_io_hdr_t *hp = &srp->header;
|
|
Sg_scatter_hold *schp = &srp->data;
|
|
int sg_tablesize = sfp->parentdp->sg_tablesize;
|
|
int mx_sc_elems, res;
|
|
struct scsi_device *sdev = sfp->parentdp->device;
|
|
|
|
if (((unsigned long)hp->dxferp &
|
|
queue_dma_alignment(sdev->request_queue)) != 0)
|
|
return 1;
|
|
|
|
mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
|
|
if (mx_sc_elems <= 0) {
|
|
return 1;
|
|
}
|
|
res = st_map_user_pages(schp->buffer, mx_sc_elems,
|
|
(unsigned long)hp->dxferp, dxfer_len,
|
|
(SG_DXFER_TO_DEV == hp->dxfer_direction) ? 1 : 0);
|
|
if (res <= 0) {
|
|
sg_remove_scat(schp);
|
|
return 1;
|
|
}
|
|
schp->k_use_sg = res;
|
|
schp->dio_in_use = 1;
|
|
hp->info |= SG_INFO_DIRECT_IO;
|
|
return 0;
|
|
#else
|
|
return 1;
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
|
|
{
|
|
struct scatterlist *sg;
|
|
int ret_sz = 0, k, rem_sz, num, mx_sc_elems;
|
|
int sg_tablesize = sfp->parentdp->sg_tablesize;
|
|
int blk_size = buff_size;
|
|
struct page *p = NULL;
|
|
|
|
if ((blk_size < 0) || (!sfp))
|
|
return -EFAULT;
|
|
if (0 == blk_size)
|
|
++blk_size; /* don't know why */
|
|
/* round request up to next highest SG_SECTOR_SZ byte boundary */
|
|
blk_size = (blk_size + SG_SECTOR_MSK) & (~SG_SECTOR_MSK);
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
|
|
buff_size, blk_size));
|
|
|
|
/* N.B. ret_sz carried into this block ... */
|
|
mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
|
|
if (mx_sc_elems < 0)
|
|
return mx_sc_elems; /* most likely -ENOMEM */
|
|
|
|
num = scatter_elem_sz;
|
|
if (unlikely(num != scatter_elem_sz_prev)) {
|
|
if (num < PAGE_SIZE) {
|
|
scatter_elem_sz = PAGE_SIZE;
|
|
scatter_elem_sz_prev = PAGE_SIZE;
|
|
} else
|
|
scatter_elem_sz_prev = num;
|
|
}
|
|
for (k = 0, sg = schp->buffer, rem_sz = blk_size;
|
|
(rem_sz > 0) && (k < mx_sc_elems);
|
|
++k, rem_sz -= ret_sz, ++sg) {
|
|
|
|
num = (rem_sz > scatter_elem_sz_prev) ?
|
|
scatter_elem_sz_prev : rem_sz;
|
|
p = sg_page_malloc(num, sfp->low_dma, &ret_sz);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
if (num == scatter_elem_sz_prev) {
|
|
if (unlikely(ret_sz > scatter_elem_sz_prev)) {
|
|
scatter_elem_sz = ret_sz;
|
|
scatter_elem_sz_prev = ret_sz;
|
|
}
|
|
}
|
|
sg->page = p;
|
|
sg->length = (ret_sz > num) ? num : ret_sz;
|
|
|
|
SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
|
|
"ret_sz=%d\n", k, num, ret_sz));
|
|
} /* end of for loop */
|
|
|
|
schp->k_use_sg = k;
|
|
SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
|
|
"rem_sz=%d\n", k, rem_sz));
|
|
|
|
schp->bufflen = blk_size;
|
|
if (rem_sz > 0) /* must have failed */
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sg_write_xfer(Sg_request * srp)
|
|
{
|
|
sg_io_hdr_t *hp = &srp->header;
|
|
Sg_scatter_hold *schp = &srp->data;
|
|
struct scatterlist *sg = schp->buffer;
|
|
int num_xfer = 0;
|
|
int j, k, onum, usglen, ksglen, res;
|
|
int iovec_count = (int) hp->iovec_count;
|
|
int dxfer_dir = hp->dxfer_direction;
|
|
unsigned char *p;
|
|
unsigned char __user *up;
|
|
int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
|
|
|
|
if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
|
|
(SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
|
|
num_xfer = (int) (new_interface ? hp->dxfer_len : hp->flags);
|
|
if (schp->bufflen < num_xfer)
|
|
num_xfer = schp->bufflen;
|
|
}
|
|
if ((num_xfer <= 0) || (schp->dio_in_use) ||
|
|
(new_interface
|
|
&& ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
|
|
return 0;
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_write_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
|
|
num_xfer, iovec_count, schp->k_use_sg));
|
|
if (iovec_count) {
|
|
onum = iovec_count;
|
|
if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
|
|
return -EFAULT;
|
|
} else
|
|
onum = 1;
|
|
|
|
ksglen = sg->length;
|
|
p = page_address(sg->page);
|
|
for (j = 0, k = 0; j < onum; ++j) {
|
|
res = sg_u_iovec(hp, iovec_count, j, 1, &usglen, &up);
|
|
if (res)
|
|
return res;
|
|
|
|
for (; p; ++sg, ksglen = sg->length,
|
|
p = page_address(sg->page)) {
|
|
if (usglen <= 0)
|
|
break;
|
|
if (ksglen > usglen) {
|
|
if (usglen >= num_xfer) {
|
|
if (__copy_from_user(p, up, num_xfer))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
if (__copy_from_user(p, up, usglen))
|
|
return -EFAULT;
|
|
p += usglen;
|
|
ksglen -= usglen;
|
|
break;
|
|
} else {
|
|
if (ksglen >= num_xfer) {
|
|
if (__copy_from_user(p, up, num_xfer))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
if (__copy_from_user(p, up, ksglen))
|
|
return -EFAULT;
|
|
up += ksglen;
|
|
usglen -= ksglen;
|
|
}
|
|
++k;
|
|
if (k >= schp->k_use_sg)
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
|
|
int wr_xf, int *countp, unsigned char __user **up)
|
|
{
|
|
int num_xfer = (int) hp->dxfer_len;
|
|
unsigned char __user *p = hp->dxferp;
|
|
int count;
|
|
|
|
if (0 == sg_num) {
|
|
if (wr_xf && ('\0' == hp->interface_id))
|
|
count = (int) hp->flags; /* holds "old" input_size */
|
|
else
|
|
count = num_xfer;
|
|
} else {
|
|
sg_iovec_t iovec;
|
|
if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
|
|
return -EFAULT;
|
|
p = iovec.iov_base;
|
|
count = (int) iovec.iov_len;
|
|
}
|
|
if (!access_ok(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count))
|
|
return -EFAULT;
|
|
if (up)
|
|
*up = p;
|
|
if (countp)
|
|
*countp = count;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
sg_remove_scat(Sg_scatter_hold * schp)
|
|
{
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
|
|
if (schp->buffer && (schp->sglist_len > 0)) {
|
|
struct scatterlist *sg = schp->buffer;
|
|
|
|
if (schp->dio_in_use) {
|
|
#ifdef SG_ALLOW_DIO_CODE
|
|
st_unmap_user_pages(sg, schp->k_use_sg, TRUE);
|
|
#endif
|
|
} else {
|
|
int k;
|
|
|
|
for (k = 0; (k < schp->k_use_sg) && sg->page;
|
|
++k, ++sg) {
|
|
SCSI_LOG_TIMEOUT(5, printk(
|
|
"sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
|
|
k, sg->page, sg->length));
|
|
sg_page_free(sg->page, sg->length);
|
|
}
|
|
}
|
|
kfree(schp->buffer);
|
|
}
|
|
memset(schp, 0, sizeof (*schp));
|
|
}
|
|
|
|
static int
|
|
sg_read_xfer(Sg_request * srp)
|
|
{
|
|
sg_io_hdr_t *hp = &srp->header;
|
|
Sg_scatter_hold *schp = &srp->data;
|
|
struct scatterlist *sg = schp->buffer;
|
|
int num_xfer = 0;
|
|
int j, k, onum, usglen, ksglen, res;
|
|
int iovec_count = (int) hp->iovec_count;
|
|
int dxfer_dir = hp->dxfer_direction;
|
|
unsigned char *p;
|
|
unsigned char __user *up;
|
|
int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
|
|
|
|
if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
|
|
|| (SG_DXFER_TO_FROM_DEV == dxfer_dir)) {
|
|
num_xfer = hp->dxfer_len;
|
|
if (schp->bufflen < num_xfer)
|
|
num_xfer = schp->bufflen;
|
|
}
|
|
if ((num_xfer <= 0) || (schp->dio_in_use) ||
|
|
(new_interface
|
|
&& ((SG_FLAG_NO_DXFER | SG_FLAG_MMAP_IO) & hp->flags)))
|
|
return 0;
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_read_xfer: num_xfer=%d, iovec_count=%d, k_use_sg=%d\n",
|
|
num_xfer, iovec_count, schp->k_use_sg));
|
|
if (iovec_count) {
|
|
onum = iovec_count;
|
|
if (!access_ok(VERIFY_READ, hp->dxferp, SZ_SG_IOVEC * onum))
|
|
return -EFAULT;
|
|
} else
|
|
onum = 1;
|
|
|
|
p = page_address(sg->page);
|
|
ksglen = sg->length;
|
|
for (j = 0, k = 0; j < onum; ++j) {
|
|
res = sg_u_iovec(hp, iovec_count, j, 0, &usglen, &up);
|
|
if (res)
|
|
return res;
|
|
|
|
for (; p; ++sg, ksglen = sg->length,
|
|
p = page_address(sg->page)) {
|
|
if (usglen <= 0)
|
|
break;
|
|
if (ksglen > usglen) {
|
|
if (usglen >= num_xfer) {
|
|
if (__copy_to_user(up, p, num_xfer))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
if (__copy_to_user(up, p, usglen))
|
|
return -EFAULT;
|
|
p += usglen;
|
|
ksglen -= usglen;
|
|
break;
|
|
} else {
|
|
if (ksglen >= num_xfer) {
|
|
if (__copy_to_user(up, p, num_xfer))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
if (__copy_to_user(up, p, ksglen))
|
|
return -EFAULT;
|
|
up += ksglen;
|
|
usglen -= ksglen;
|
|
}
|
|
++k;
|
|
if (k >= schp->k_use_sg)
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
|
|
{
|
|
Sg_scatter_hold *schp = &srp->data;
|
|
struct scatterlist *sg = schp->buffer;
|
|
int k, num;
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
|
|
num_read_xfer));
|
|
if ((!outp) || (num_read_xfer <= 0))
|
|
return 0;
|
|
|
|
for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) {
|
|
num = sg->length;
|
|
if (num > num_read_xfer) {
|
|
if (__copy_to_user(outp, page_address(sg->page),
|
|
num_read_xfer))
|
|
return -EFAULT;
|
|
break;
|
|
} else {
|
|
if (__copy_to_user(outp, page_address(sg->page),
|
|
num))
|
|
return -EFAULT;
|
|
num_read_xfer -= num;
|
|
if (num_read_xfer <= 0)
|
|
break;
|
|
outp += num;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
sg_build_reserve(Sg_fd * sfp, int req_size)
|
|
{
|
|
Sg_scatter_hold *schp = &sfp->reserve;
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
|
|
do {
|
|
if (req_size < PAGE_SIZE)
|
|
req_size = PAGE_SIZE;
|
|
if (0 == sg_build_indirect(schp, sfp, req_size))
|
|
return;
|
|
else
|
|
sg_remove_scat(schp);
|
|
req_size >>= 1; /* divide by 2 */
|
|
} while (req_size > (PAGE_SIZE / 2));
|
|
}
|
|
|
|
static void
|
|
sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
|
|
{
|
|
Sg_scatter_hold *req_schp = &srp->data;
|
|
Sg_scatter_hold *rsv_schp = &sfp->reserve;
|
|
struct scatterlist *sg = rsv_schp->buffer;
|
|
int k, num, rem;
|
|
|
|
srp->res_used = 1;
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
|
|
rem = size;
|
|
|
|
for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) {
|
|
num = sg->length;
|
|
if (rem <= num) {
|
|
sfp->save_scat_len = num;
|
|
sg->length = rem;
|
|
req_schp->k_use_sg = k + 1;
|
|
req_schp->sglist_len = rsv_schp->sglist_len;
|
|
req_schp->buffer = rsv_schp->buffer;
|
|
|
|
req_schp->bufflen = size;
|
|
req_schp->b_malloc_len = rsv_schp->b_malloc_len;
|
|
break;
|
|
} else
|
|
rem -= num;
|
|
}
|
|
|
|
if (k >= rsv_schp->k_use_sg)
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
|
|
}
|
|
|
|
static void
|
|
sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp)
|
|
{
|
|
Sg_scatter_hold *req_schp = &srp->data;
|
|
Sg_scatter_hold *rsv_schp = &sfp->reserve;
|
|
|
|
SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
|
|
(int) req_schp->k_use_sg));
|
|
if ((rsv_schp->k_use_sg > 0) && (req_schp->k_use_sg > 0)) {
|
|
struct scatterlist *sg = rsv_schp->buffer;
|
|
|
|
if (sfp->save_scat_len > 0)
|
|
(sg + (req_schp->k_use_sg - 1))->length =
|
|
(unsigned) sfp->save_scat_len;
|
|
else
|
|
SCSI_LOG_TIMEOUT(1, printk ("sg_unlink_reserve: BAD save_scat_len\n"));
|
|
}
|
|
req_schp->k_use_sg = 0;
|
|
req_schp->bufflen = 0;
|
|
req_schp->buffer = NULL;
|
|
req_schp->sglist_len = 0;
|
|
sfp->save_scat_len = 0;
|
|
srp->res_used = 0;
|
|
}
|
|
|
|
static Sg_request *
|
|
sg_get_rq_mark(Sg_fd * sfp, int pack_id)
|
|
{
|
|
Sg_request *resp;
|
|
unsigned long iflags;
|
|
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
for (resp = sfp->headrp; resp; resp = resp->nextrp) {
|
|
/* look for requests that are ready + not SG_IO owned */
|
|
if ((1 == resp->done) && (!resp->sg_io_owned) &&
|
|
((-1 == pack_id) || (resp->header.pack_id == pack_id))) {
|
|
resp->done = 2; /* guard against other readers */
|
|
break;
|
|
}
|
|
}
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return resp;
|
|
}
|
|
|
|
#ifdef CONFIG_SCSI_PROC_FS
|
|
static Sg_request *
|
|
sg_get_nth_request(Sg_fd * sfp, int nth)
|
|
{
|
|
Sg_request *resp;
|
|
unsigned long iflags;
|
|
int k;
|
|
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
for (k = 0, resp = sfp->headrp; resp && (k < nth);
|
|
++k, resp = resp->nextrp) ;
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return resp;
|
|
}
|
|
#endif
|
|
|
|
/* always adds to end of list */
|
|
static Sg_request *
|
|
sg_add_request(Sg_fd * sfp)
|
|
{
|
|
int k;
|
|
unsigned long iflags;
|
|
Sg_request *resp;
|
|
Sg_request *rp = sfp->req_arr;
|
|
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
resp = sfp->headrp;
|
|
if (!resp) {
|
|
memset(rp, 0, sizeof (Sg_request));
|
|
rp->parentfp = sfp;
|
|
resp = rp;
|
|
sfp->headrp = resp;
|
|
} else {
|
|
if (0 == sfp->cmd_q)
|
|
resp = NULL; /* command queuing disallowed */
|
|
else {
|
|
for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) {
|
|
if (!rp->parentfp)
|
|
break;
|
|
}
|
|
if (k < SG_MAX_QUEUE) {
|
|
memset(rp, 0, sizeof (Sg_request));
|
|
rp->parentfp = sfp;
|
|
while (resp->nextrp)
|
|
resp = resp->nextrp;
|
|
resp->nextrp = rp;
|
|
resp = rp;
|
|
} else
|
|
resp = NULL;
|
|
}
|
|
}
|
|
if (resp) {
|
|
resp->nextrp = NULL;
|
|
resp->header.duration = jiffies_to_msecs(jiffies);
|
|
}
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return resp;
|
|
}
|
|
|
|
/* Return of 1 for found; 0 for not found */
|
|
static int
|
|
sg_remove_request(Sg_fd * sfp, Sg_request * srp)
|
|
{
|
|
Sg_request *prev_rp;
|
|
Sg_request *rp;
|
|
unsigned long iflags;
|
|
int res = 0;
|
|
|
|
if ((!sfp) || (!srp) || (!sfp->headrp))
|
|
return res;
|
|
write_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
prev_rp = sfp->headrp;
|
|
if (srp == prev_rp) {
|
|
sfp->headrp = prev_rp->nextrp;
|
|
prev_rp->parentfp = NULL;
|
|
res = 1;
|
|
} else {
|
|
while ((rp = prev_rp->nextrp)) {
|
|
if (srp == rp) {
|
|
prev_rp->nextrp = rp->nextrp;
|
|
rp->parentfp = NULL;
|
|
res = 1;
|
|
break;
|
|
}
|
|
prev_rp = rp;
|
|
}
|
|
}
|
|
write_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return res;
|
|
}
|
|
|
|
#ifdef CONFIG_SCSI_PROC_FS
|
|
static Sg_fd *
|
|
sg_get_nth_sfp(Sg_device * sdp, int nth)
|
|
{
|
|
Sg_fd *resp;
|
|
unsigned long iflags;
|
|
int k;
|
|
|
|
read_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
for (k = 0, resp = sdp->headfp; resp && (k < nth);
|
|
++k, resp = resp->nextfp) ;
|
|
read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
return resp;
|
|
}
|
|
#endif
|
|
|
|
static Sg_fd *
|
|
sg_add_sfp(Sg_device * sdp, int dev)
|
|
{
|
|
Sg_fd *sfp;
|
|
unsigned long iflags;
|
|
|
|
sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN);
|
|
if (!sfp)
|
|
return NULL;
|
|
|
|
init_waitqueue_head(&sfp->read_wait);
|
|
rwlock_init(&sfp->rq_list_lock);
|
|
|
|
sfp->timeout = SG_DEFAULT_TIMEOUT;
|
|
sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER;
|
|
sfp->force_packid = SG_DEF_FORCE_PACK_ID;
|
|
sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ?
|
|
sdp->device->host->unchecked_isa_dma : 1;
|
|
sfp->cmd_q = SG_DEF_COMMAND_Q;
|
|
sfp->keep_orphan = SG_DEF_KEEP_ORPHAN;
|
|
sfp->parentdp = sdp;
|
|
write_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
if (!sdp->headfp)
|
|
sdp->headfp = sfp;
|
|
else { /* add to tail of existing list */
|
|
Sg_fd *pfp = sdp->headfp;
|
|
while (pfp->nextfp)
|
|
pfp = pfp->nextfp;
|
|
pfp->nextfp = sfp;
|
|
}
|
|
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
|
|
if (unlikely(sg_big_buff != def_reserved_size))
|
|
sg_big_buff = def_reserved_size;
|
|
|
|
sg_build_reserve(sfp, sg_big_buff);
|
|
SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
|
|
sfp->reserve.bufflen, sfp->reserve.k_use_sg));
|
|
return sfp;
|
|
}
|
|
|
|
static void
|
|
__sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
|
|
{
|
|
Sg_fd *fp;
|
|
Sg_fd *prev_fp;
|
|
|
|
prev_fp = sdp->headfp;
|
|
if (sfp == prev_fp)
|
|
sdp->headfp = prev_fp->nextfp;
|
|
else {
|
|
while ((fp = prev_fp->nextfp)) {
|
|
if (sfp == fp) {
|
|
prev_fp->nextfp = fp->nextfp;
|
|
break;
|
|
}
|
|
prev_fp = fp;
|
|
}
|
|
}
|
|
if (sfp->reserve.bufflen > 0) {
|
|
SCSI_LOG_TIMEOUT(6,
|
|
printk("__sg_remove_sfp: bufflen=%d, k_use_sg=%d\n",
|
|
(int) sfp->reserve.bufflen, (int) sfp->reserve.k_use_sg));
|
|
sg_remove_scat(&sfp->reserve);
|
|
}
|
|
sfp->parentdp = NULL;
|
|
SCSI_LOG_TIMEOUT(6, printk("__sg_remove_sfp: sfp=0x%p\n", sfp));
|
|
kfree(sfp);
|
|
}
|
|
|
|
/* Returns 0 in normal case, 1 when detached and sdp object removed */
|
|
static int
|
|
sg_remove_sfp(Sg_device * sdp, Sg_fd * sfp)
|
|
{
|
|
Sg_request *srp;
|
|
Sg_request *tsrp;
|
|
int dirty = 0;
|
|
int res = 0;
|
|
|
|
for (srp = sfp->headrp; srp; srp = tsrp) {
|
|
tsrp = srp->nextrp;
|
|
if (sg_srp_done(srp, sfp))
|
|
sg_finish_rem_req(srp);
|
|
else
|
|
++dirty;
|
|
}
|
|
if (0 == dirty) {
|
|
unsigned long iflags;
|
|
|
|
write_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
__sg_remove_sfp(sdp, sfp);
|
|
if (sdp->detached && (NULL == sdp->headfp)) {
|
|
int k, maxd;
|
|
|
|
maxd = sg_dev_max;
|
|
for (k = 0; k < maxd; ++k) {
|
|
if (sdp == sg_dev_arr[k])
|
|
break;
|
|
}
|
|
if (k < maxd)
|
|
sg_dev_arr[k] = NULL;
|
|
kfree((char *) sdp);
|
|
res = 1;
|
|
}
|
|
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
} else {
|
|
/* MOD_INC's to inhibit unloading sg and associated adapter driver */
|
|
/* only bump the access_count if we actually succeeded in
|
|
* throwing another counter on the host module */
|
|
scsi_device_get(sdp->device); /* XXX: retval ignored? */
|
|
sfp->closed = 1; /* flag dirty state on this fd */
|
|
SCSI_LOG_TIMEOUT(1, printk("sg_remove_sfp: worrisome, %d writes pending\n",
|
|
dirty));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
sg_res_in_use(Sg_fd * sfp)
|
|
{
|
|
const Sg_request *srp;
|
|
unsigned long iflags;
|
|
|
|
read_lock_irqsave(&sfp->rq_list_lock, iflags);
|
|
for (srp = sfp->headrp; srp; srp = srp->nextrp)
|
|
if (srp->res_used)
|
|
break;
|
|
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
|
|
return srp ? 1 : 0;
|
|
}
|
|
|
|
/* The size fetched (value output via retSzp) set when non-NULL return */
|
|
static struct page *
|
|
sg_page_malloc(int rqSz, int lowDma, int *retSzp)
|
|
{
|
|
struct page *resp = NULL;
|
|
gfp_t page_mask;
|
|
int order, a_size;
|
|
int resSz;
|
|
|
|
if ((rqSz <= 0) || (NULL == retSzp))
|
|
return resp;
|
|
|
|
if (lowDma)
|
|
page_mask = GFP_ATOMIC | GFP_DMA | __GFP_COMP | __GFP_NOWARN;
|
|
else
|
|
page_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
|
|
|
|
for (order = 0, a_size = PAGE_SIZE; a_size < rqSz;
|
|
order++, a_size <<= 1) ;
|
|
resSz = a_size; /* rounded up if necessary */
|
|
resp = alloc_pages(page_mask, order);
|
|
while ((!resp) && order) {
|
|
--order;
|
|
a_size >>= 1; /* divide by 2, until PAGE_SIZE */
|
|
resp = alloc_pages(page_mask, order); /* try half */
|
|
resSz = a_size;
|
|
}
|
|
if (resp) {
|
|
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
|
|
memset(page_address(resp), 0, resSz);
|
|
*retSzp = resSz;
|
|
}
|
|
return resp;
|
|
}
|
|
|
|
static void
|
|
sg_page_free(struct page *page, int size)
|
|
{
|
|
int order, a_size;
|
|
|
|
if (!page)
|
|
return;
|
|
for (order = 0, a_size = PAGE_SIZE; a_size < size;
|
|
order++, a_size <<= 1) ;
|
|
__free_pages(page, order);
|
|
}
|
|
|
|
#ifndef MAINTENANCE_IN_CMD
|
|
#define MAINTENANCE_IN_CMD 0xa3
|
|
#endif
|
|
|
|
static unsigned char allow_ops[] = { TEST_UNIT_READY, REQUEST_SENSE,
|
|
INQUIRY, READ_CAPACITY, READ_BUFFER, READ_6, READ_10, READ_12,
|
|
READ_16, MODE_SENSE, MODE_SENSE_10, LOG_SENSE, REPORT_LUNS,
|
|
SERVICE_ACTION_IN, RECEIVE_DIAGNOSTIC, READ_LONG, MAINTENANCE_IN_CMD
|
|
};
|
|
|
|
static int
|
|
sg_allow_access(unsigned char opcode, char dev_type)
|
|
{
|
|
int k;
|
|
|
|
if (TYPE_SCANNER == dev_type) /* TYPE_ROM maybe burner */
|
|
return 1;
|
|
for (k = 0; k < sizeof (allow_ops); ++k) {
|
|
if (opcode == allow_ops[k])
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SCSI_PROC_FS
|
|
static int
|
|
sg_last_dev(void)
|
|
{
|
|
int k;
|
|
unsigned long iflags;
|
|
|
|
read_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
for (k = sg_dev_max - 1; k >= 0; --k)
|
|
if (sg_dev_arr[k] && sg_dev_arr[k]->device)
|
|
break;
|
|
read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
return k + 1; /* origin 1 */
|
|
}
|
|
#endif
|
|
|
|
static Sg_device *
|
|
sg_get_dev(int dev)
|
|
{
|
|
Sg_device *sdp = NULL;
|
|
unsigned long iflags;
|
|
|
|
if (sg_dev_arr && (dev >= 0)) {
|
|
read_lock_irqsave(&sg_dev_arr_lock, iflags);
|
|
if (dev < sg_dev_max)
|
|
sdp = sg_dev_arr[dev];
|
|
read_unlock_irqrestore(&sg_dev_arr_lock, iflags);
|
|
}
|
|
return sdp;
|
|
}
|
|
|
|
#ifdef CONFIG_SCSI_PROC_FS
|
|
|
|
static struct proc_dir_entry *sg_proc_sgp = NULL;
|
|
|
|
static char sg_proc_sg_dirname[] = "scsi/sg";
|
|
|
|
static int sg_proc_seq_show_int(struct seq_file *s, void *v);
|
|
|
|
static int sg_proc_single_open_adio(struct inode *inode, struct file *file);
|
|
static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer,
|
|
size_t count, loff_t *off);
|
|
static struct file_operations adio_fops = {
|
|
/* .owner, .read and .llseek added in sg_proc_init() */
|
|
.open = sg_proc_single_open_adio,
|
|
.write = sg_proc_write_adio,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int sg_proc_single_open_dressz(struct inode *inode, struct file *file);
|
|
static ssize_t sg_proc_write_dressz(struct file *filp,
|
|
const char __user *buffer, size_t count, loff_t *off);
|
|
static struct file_operations dressz_fops = {
|
|
.open = sg_proc_single_open_dressz,
|
|
.write = sg_proc_write_dressz,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int sg_proc_seq_show_version(struct seq_file *s, void *v);
|
|
static int sg_proc_single_open_version(struct inode *inode, struct file *file);
|
|
static struct file_operations version_fops = {
|
|
.open = sg_proc_single_open_version,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v);
|
|
static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file);
|
|
static struct file_operations devhdr_fops = {
|
|
.open = sg_proc_single_open_devhdr,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int sg_proc_seq_show_dev(struct seq_file *s, void *v);
|
|
static int sg_proc_open_dev(struct inode *inode, struct file *file);
|
|
static void * dev_seq_start(struct seq_file *s, loff_t *pos);
|
|
static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos);
|
|
static void dev_seq_stop(struct seq_file *s, void *v);
|
|
static struct file_operations dev_fops = {
|
|
.open = sg_proc_open_dev,
|
|
.release = seq_release,
|
|
};
|
|
static struct seq_operations dev_seq_ops = {
|
|
.start = dev_seq_start,
|
|
.next = dev_seq_next,
|
|
.stop = dev_seq_stop,
|
|
.show = sg_proc_seq_show_dev,
|
|
};
|
|
|
|
static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v);
|
|
static int sg_proc_open_devstrs(struct inode *inode, struct file *file);
|
|
static struct file_operations devstrs_fops = {
|
|
.open = sg_proc_open_devstrs,
|
|
.release = seq_release,
|
|
};
|
|
static struct seq_operations devstrs_seq_ops = {
|
|
.start = dev_seq_start,
|
|
.next = dev_seq_next,
|
|
.stop = dev_seq_stop,
|
|
.show = sg_proc_seq_show_devstrs,
|
|
};
|
|
|
|
static int sg_proc_seq_show_debug(struct seq_file *s, void *v);
|
|
static int sg_proc_open_debug(struct inode *inode, struct file *file);
|
|
static struct file_operations debug_fops = {
|
|
.open = sg_proc_open_debug,
|
|
.release = seq_release,
|
|
};
|
|
static struct seq_operations debug_seq_ops = {
|
|
.start = dev_seq_start,
|
|
.next = dev_seq_next,
|
|
.stop = dev_seq_stop,
|
|
.show = sg_proc_seq_show_debug,
|
|
};
|
|
|
|
|
|
struct sg_proc_leaf {
|
|
const char * name;
|
|
struct file_operations * fops;
|
|
};
|
|
|
|
static struct sg_proc_leaf sg_proc_leaf_arr[] = {
|
|
{"allow_dio", &adio_fops},
|
|
{"debug", &debug_fops},
|
|
{"def_reserved_size", &dressz_fops},
|
|
{"device_hdr", &devhdr_fops},
|
|
{"devices", &dev_fops},
|
|
{"device_strs", &devstrs_fops},
|
|
{"version", &version_fops}
|
|
};
|
|
|
|
static int
|
|
sg_proc_init(void)
|
|
{
|
|
int k, mask;
|
|
int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
|
|
struct proc_dir_entry *pdep;
|
|
struct sg_proc_leaf * leaf;
|
|
|
|
sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL);
|
|
if (!sg_proc_sgp)
|
|
return 1;
|
|
for (k = 0; k < num_leaves; ++k) {
|
|
leaf = &sg_proc_leaf_arr[k];
|
|
mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO;
|
|
pdep = create_proc_entry(leaf->name, mask, sg_proc_sgp);
|
|
if (pdep) {
|
|
leaf->fops->owner = THIS_MODULE,
|
|
leaf->fops->read = seq_read,
|
|
leaf->fops->llseek = seq_lseek,
|
|
pdep->proc_fops = leaf->fops;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
sg_proc_cleanup(void)
|
|
{
|
|
int k;
|
|
int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr);
|
|
|
|
if (!sg_proc_sgp)
|
|
return;
|
|
for (k = 0; k < num_leaves; ++k)
|
|
remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp);
|
|
remove_proc_entry(sg_proc_sg_dirname, NULL);
|
|
}
|
|
|
|
|
|
static int sg_proc_seq_show_int(struct seq_file *s, void *v)
|
|
{
|
|
seq_printf(s, "%d\n", *((int *)s->private));
|
|
return 0;
|
|
}
|
|
|
|
static int sg_proc_single_open_adio(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, sg_proc_seq_show_int, &sg_allow_dio);
|
|
}
|
|
|
|
static ssize_t
|
|
sg_proc_write_adio(struct file *filp, const char __user *buffer,
|
|
size_t count, loff_t *off)
|
|
{
|
|
int num;
|
|
char buff[11];
|
|
|
|
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
|
|
return -EACCES;
|
|
num = (count < 10) ? count : 10;
|
|
if (copy_from_user(buff, buffer, num))
|
|
return -EFAULT;
|
|
buff[num] = '\0';
|
|
sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
|
|
return count;
|
|
}
|
|
|
|
static int sg_proc_single_open_dressz(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, sg_proc_seq_show_int, &sg_big_buff);
|
|
}
|
|
|
|
static ssize_t
|
|
sg_proc_write_dressz(struct file *filp, const char __user *buffer,
|
|
size_t count, loff_t *off)
|
|
{
|
|
int num;
|
|
unsigned long k = ULONG_MAX;
|
|
char buff[11];
|
|
|
|
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
|
|
return -EACCES;
|
|
num = (count < 10) ? count : 10;
|
|
if (copy_from_user(buff, buffer, num))
|
|
return -EFAULT;
|
|
buff[num] = '\0';
|
|
k = simple_strtoul(buff, NULL, 10);
|
|
if (k <= 1048576) { /* limit "big buff" to 1 MB */
|
|
sg_big_buff = k;
|
|
return count;
|
|
}
|
|
return -ERANGE;
|
|
}
|
|
|
|
static int sg_proc_seq_show_version(struct seq_file *s, void *v)
|
|
{
|
|
seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
|
|
sg_version_date);
|
|
return 0;
|
|
}
|
|
|
|
static int sg_proc_single_open_version(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, sg_proc_seq_show_version, NULL);
|
|
}
|
|
|
|
static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v)
|
|
{
|
|
seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t"
|
|
"online\n");
|
|
return 0;
|
|
}
|
|
|
|
static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, sg_proc_seq_show_devhdr, NULL);
|
|
}
|
|
|
|
struct sg_proc_deviter {
|
|
loff_t index;
|
|
size_t max;
|
|
};
|
|
|
|
static void * dev_seq_start(struct seq_file *s, loff_t *pos)
|
|
{
|
|
struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL);
|
|
|
|
s->private = it;
|
|
if (! it)
|
|
return NULL;
|
|
|
|
if (NULL == sg_dev_arr)
|
|
return NULL;
|
|
it->index = *pos;
|
|
it->max = sg_last_dev();
|
|
if (it->index >= it->max)
|
|
return NULL;
|
|
return it;
|
|
}
|
|
|
|
static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos)
|
|
{
|
|
struct sg_proc_deviter * it = s->private;
|
|
|
|
*pos = ++it->index;
|
|
return (it->index < it->max) ? it : NULL;
|
|
}
|
|
|
|
static void dev_seq_stop(struct seq_file *s, void *v)
|
|
{
|
|
kfree(s->private);
|
|
}
|
|
|
|
static int sg_proc_open_dev(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &dev_seq_ops);
|
|
}
|
|
|
|
static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
|
|
{
|
|
struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
|
|
Sg_device *sdp;
|
|
struct scsi_device *scsidp;
|
|
|
|
sdp = it ? sg_get_dev(it->index) : NULL;
|
|
if (sdp && (scsidp = sdp->device) && (!sdp->detached))
|
|
seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n",
|
|
scsidp->host->host_no, scsidp->channel,
|
|
scsidp->id, scsidp->lun, (int) scsidp->type,
|
|
1,
|
|
(int) scsidp->queue_depth,
|
|
(int) scsidp->device_busy,
|
|
(int) scsi_device_online(scsidp));
|
|
else
|
|
seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n");
|
|
return 0;
|
|
}
|
|
|
|
static int sg_proc_open_devstrs(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &devstrs_seq_ops);
|
|
}
|
|
|
|
static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v)
|
|
{
|
|
struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
|
|
Sg_device *sdp;
|
|
struct scsi_device *scsidp;
|
|
|
|
sdp = it ? sg_get_dev(it->index) : NULL;
|
|
if (sdp && (scsidp = sdp->device) && (!sdp->detached))
|
|
seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n",
|
|
scsidp->vendor, scsidp->model, scsidp->rev);
|
|
else
|
|
seq_printf(s, "<no active device>\n");
|
|
return 0;
|
|
}
|
|
|
|
static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp)
|
|
{
|
|
int k, m, new_interface, blen, usg;
|
|
Sg_request *srp;
|
|
Sg_fd *fp;
|
|
const sg_io_hdr_t *hp;
|
|
const char * cp;
|
|
unsigned int ms;
|
|
|
|
for (k = 0; (fp = sg_get_nth_sfp(sdp, k)); ++k) {
|
|
seq_printf(s, " FD(%d): timeout=%dms bufflen=%d "
|
|
"(res)sgat=%d low_dma=%d\n", k + 1,
|
|
jiffies_to_msecs(fp->timeout),
|
|
fp->reserve.bufflen,
|
|
(int) fp->reserve.k_use_sg,
|
|
(int) fp->low_dma);
|
|
seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n",
|
|
(int) fp->cmd_q, (int) fp->force_packid,
|
|
(int) fp->keep_orphan, (int) fp->closed);
|
|
for (m = 0; (srp = sg_get_nth_request(fp, m)); ++m) {
|
|
hp = &srp->header;
|
|
new_interface = (hp->interface_id == '\0') ? 0 : 1;
|
|
if (srp->res_used) {
|
|
if (new_interface &&
|
|
(SG_FLAG_MMAP_IO & hp->flags))
|
|
cp = " mmap>> ";
|
|
else
|
|
cp = " rb>> ";
|
|
} else {
|
|
if (SG_INFO_DIRECT_IO_MASK & hp->info)
|
|
cp = " dio>> ";
|
|
else
|
|
cp = " ";
|
|
}
|
|
seq_printf(s, cp);
|
|
blen = srp->data.bufflen;
|
|
usg = srp->data.k_use_sg;
|
|
seq_printf(s, srp->done ?
|
|
((1 == srp->done) ? "rcv:" : "fin:")
|
|
: "act:");
|
|
seq_printf(s, " id=%d blen=%d",
|
|
srp->header.pack_id, blen);
|
|
if (srp->done)
|
|
seq_printf(s, " dur=%d", hp->duration);
|
|
else {
|
|
ms = jiffies_to_msecs(jiffies);
|
|
seq_printf(s, " t_o/elap=%d/%d",
|
|
(new_interface ? hp->timeout :
|
|
jiffies_to_msecs(fp->timeout)),
|
|
(ms > hp->duration ? ms - hp->duration : 0));
|
|
}
|
|
seq_printf(s, "ms sgat=%d op=0x%02x\n", usg,
|
|
(int) srp->data.cmd_opcode);
|
|
}
|
|
if (0 == m)
|
|
seq_printf(s, " No requests active\n");
|
|
}
|
|
}
|
|
|
|
static int sg_proc_open_debug(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &debug_seq_ops);
|
|
}
|
|
|
|
static int sg_proc_seq_show_debug(struct seq_file *s, void *v)
|
|
{
|
|
struct sg_proc_deviter * it = (struct sg_proc_deviter *) v;
|
|
Sg_device *sdp;
|
|
|
|
if (it && (0 == it->index)) {
|
|
seq_printf(s, "dev_max(currently)=%d max_active_device=%d "
|
|
"(origin 1)\n", sg_dev_max, (int)it->max);
|
|
seq_printf(s, " def_reserved_size=%d\n", sg_big_buff);
|
|
}
|
|
sdp = it ? sg_get_dev(it->index) : NULL;
|
|
if (sdp) {
|
|
struct scsi_device *scsidp = sdp->device;
|
|
|
|
if (NULL == scsidp) {
|
|
seq_printf(s, "device %d detached ??\n",
|
|
(int)it->index);
|
|
return 0;
|
|
}
|
|
|
|
if (sg_get_nth_sfp(sdp, 0)) {
|
|
seq_printf(s, " >>> device=%s ",
|
|
sdp->disk->disk_name);
|
|
if (sdp->detached)
|
|
seq_printf(s, "detached pending close ");
|
|
else
|
|
seq_printf
|
|
(s, "scsi%d chan=%d id=%d lun=%d em=%d",
|
|
scsidp->host->host_no,
|
|
scsidp->channel, scsidp->id,
|
|
scsidp->lun,
|
|
scsidp->host->hostt->emulated);
|
|
seq_printf(s, " sg_tablesize=%d excl=%d\n",
|
|
sdp->sg_tablesize, sdp->exclude);
|
|
}
|
|
sg_proc_debug_helper(s, sdp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_SCSI_PROC_FS */
|
|
|
|
module_init(init_sg);
|
|
module_exit(exit_sg);
|