megaraid_mm.rar_V2

/* * * Linux MegaRAID device driver * * Copyright (c) 2003-2004 LSI Logic Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * FILE : megaraid_mm.c * Version : v2.20.2.7 (Jul 16 2006) * * Common management module */ #include <linux/sched.h> #include <linux/slab.h> #include <linux/mutex.h> #include "megaraid_mm.h" // Entry points for char node driver static DEFINE_MUTEX(mraid_mm_mutex); static int mraid_mm_open(struct inode *, struct file *); static long mraid_mm_unlocked_ioctl(struct file *, uint, unsigned long); // routines to convert to and from the old the format static int mimd_to_kioc(mimd_t __user *, mraid_mmadp_t *, uioc_t *); static int kioc_to_mimd(uioc_t *, mimd_t __user *); // Helper functions static int handle_drvrcmd(void __user *, uint8_t, int *); static int lld_ioctl(mraid_mmadp_t *, uioc_t *); static void ioctl_done(uioc_t *); static void lld_timedout(unsigned long); static void hinfo_to_cinfo(mraid_hba_info_t *, mcontroller_t *); static mraid_mmadp_t *mraid_mm_get_adapter(mimd_t __user *, int *); static uioc_t *mraid_mm_alloc_kioc(mraid_mmadp_t *); static void mraid_mm_dealloc_kioc(mraid_mmadp_t *, uioc_t *); static int mraid_mm_attach_buf(mraid_mmadp_t *, uioc_t *, int); static int mraid_mm_setup_dma_pools(mraid_mmadp_t *); static void mraid_mm_free_adp_resources(mraid_mmadp_t *); static void mraid_mm_teardown_dma_pools(mraid_mmadp_t *); #ifdef CONFIG_COMPAT static long mraid_mm_compat_ioctl(struct file *, unsigned int, unsigned long); #endif MODULE_AUTHOR("LSI Logic Corporation"); MODULE_DESCRIPTION("LSI Logic Management Module"); MODULE_LICENSE("GPL"); MODULE_VERSION(LSI_COMMON_MOD_VERSION); static int dbglevel = CL_ANN; module_param_named(dlevel, dbglevel, int, 0); MODULE_PARM_DESC(dlevel, "Debug level (default=0)"); EXPORT_SYMBOL(mraid_mm_register_adp); EXPORT_SYMBOL(mraid_mm_unregister_adp); EXPORT_SYMBOL(mraid_mm_adapter_app_handle); static uint32_t drvr_ver = 0x02200207; static int adapters_count_g; static struct list_head adapters_list_g; static wait_queue_head_t wait_q; static const struct file_operations lsi_fops = { .open = mraid_mm_open, .unlocked_ioctl = mraid_mm_unlocked_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = mraid_mm_compat_ioctl, #endif .owner = THIS_MODULE, .llseek = noop_llseek, }; static struct miscdevice megaraid_mm_dev = { .minor = MISC_DYNAMIC_MINOR, .name = "megadev0", .fops = &lsi_fops, }; /** * mraid_mm_open - open routine for char node interface * @inode : unused * @filep : unused * * Allow ioctl operations by apps only if they have superuser privilege. */ static int mraid_mm_open(struct inode *inode, struct file *filep) { /* * Only allow superuser to access private ioctl interface */ if (!capable(CAP_SYS_ADMIN)) return (-EACCES); return 0; } /** * mraid_mm_ioctl - module entry-point for ioctls * @inode : inode (ignored) * @filep : file operations pointer (ignored) * @cmd : ioctl command * @arg : user ioctl packet */ static int mraid_mm_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) { uioc_t *kioc; char signature[EXT_IOCTL_SIGN_SZ] = {0}; int rval; mraid_mmadp_t *adp; uint8_t old_ioctl; int drvrcmd_rval; void __user *argp = (void __user *)arg; /* * Make sure only USCSICMD are issued through this interface. * MIMD application would still fire different command. */ if ((_IOC_TYPE(cmd) != MEGAIOC_MAGIC) && (cmd != USCSICMD)) { return (-EINVAL); } /* * Look for signature to see if this is the new or old ioctl format. */ if (copy_from_user(signature, argp, EXT_IOCTL_SIGN_SZ)) { con_log(CL_ANN, (KERN_WARNING "megaraid cmm: copy from usr addr failed\n")); return (-EFAULT); } if (memcmp(signature, EXT_IOCTL_SIGN, EXT_IOCTL_SIGN_SZ) == 0) old_ioctl = 0; else old_ioctl = 1; /* * At present, we don't support the new ioctl packet */ if (!old_ioctl ) return (-EINVAL); /* * If it is a driver ioctl (as opposed to fw ioctls), then we can * handle the command locally. rval > 0 means it is not a drvr cmd */ rval = handle_drvrcmd(argp, old_ioctl, &drvrcmd_rval); if (rval < 0) return rval; else if (rval == 0) return drvrcmd_rval; rval = 0; if ((adp = mraid_mm_get_adapter(argp, &rval)) == NULL) { return rval; } /* * Check if adapter can accept ioctl. We may have marked it offline * if any previous kioc had timedout on this controller. */ if (!adp->quiescent) { con_log(CL_ANN, (KERN_WARNING "megaraid cmm: controller cannot accept cmds due to " "earlier errors\n" )); return -EFAULT; } /* * The following call will block till a kioc is available */ kioc = mraid_mm_alloc_kioc(adp); /* * User sent the old mimd_t ioctl packet. Convert it to uioc_t. */ if ((rval = mimd_to_kioc(argp, adp, kioc))) { mraid_mm_dealloc_kioc(adp, kioc); return rval; } kioc->done = ioctl_done; /* * Issue the IOCTL to the low level driver. After the IOCTL completes * release the kioc if and only if it was _not_ timedout. If it was * timedout, that means that resources are still with low level driver. */ if ((rval = lld_ioctl(adp, kioc))) { if (!kioc->timedout) mraid_mm_dealloc_kioc(adp, kioc); return rval; } /* * Convert the kioc back to user space */ rval = kioc_to_mimd(kioc, argp); /* * Return the kioc to free pool */ mraid_mm_dealloc_kioc(adp, kioc); return rval; } static long mraid_mm_unlocked_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) { int err; /* inconsistent: mraid_mm_compat_ioctl doesn't take the BKL */ mutex_lock(&mraid_mm_mutex); err = mraid_mm_ioctl(filep, cmd, arg); mutex_unlock(&mraid_mm_mutex); return err; } /** * mraid_mm_get_adapter - Returns corresponding adapters for the mimd packet * @umimd : User space mimd_t ioctl packet * @rval : returned success/error status * * The function return value is a pointer to the located @adapter. */ static mraid_mmadp_t * mraid_mm_get_adapter(mimd_t __user *umimd, int *rval) { mraid_mmadp_t *adapter; mimd_t mimd; uint32_t adapno; int iterator; if (copy_from_user(&mimd, umimd, sizeof(mimd_t))) { *rval = -EFAULT; return NULL; } adapno = GETADAP(mimd.ui.fcs.adapno); if (adapno >= adapters_count_g) { *rval = -ENODEV; return NULL; } adapter = NULL; iterator = 0; list_for_each_entry(adapter, &adapters_list_g, list) { if (iterator++ == adapno) break; } if (!adapter) { *rval = -ENODEV; return NULL; } return adapter; } /** * handle_drvrcmd - Checks if the opcode is a driver cmd and if it is, handles it. * @arg : packet sent by the user app * @old_ioctl : mimd if 1; uioc otherwise * @rval : pointer for command's returned value (not function status) */ static int handle_drvrcmd(void __user *arg, uint8_t old_ioctl, int *rval) { mimd_t __user *umimd; mimd_t kmimd; uint8_t opcode; uint8_t subopcode; if (old_ioctl) goto old_packet; else goto new_packet; new_packet: return (-ENOTSUPP); old_packet: *rval = 0; umimd = arg; if (copy_from_user(&kmimd, umimd, sizeof(mimd_t))) return (-EFAULT); opcode = kmimd.ui.fcs.opcode; subopcode = kmimd.ui.fcs.subopcode; /* * If the opcode is 0x82 and the subopcode is either GET_DRVRVER or * GET_NUMADP, then we can handle. Otherwise we should return 1 to * indicate that we cannot handle this. */ if (opcode != 0x82) return 1; switch (subopcode) { case MEGAIOC_QDRVRVER: if (copy_to_user(kmimd.data, &drvr_ver, sizeof(uint32_t))) return (-EFAULT); return 0; case MEGAIOC_QNADAP: *rval = adapters_count_g; if (copy_to_user(kmimd.data, &adapters_count_g, sizeof(uint32_t))) return (-EFAULT); return 0; default: /* cannot handle */ return 1; } return 0; } /** * mi