[PATCH] fix semaphore handling in __unregister_chrdev_region

[linux/fpc-iii.git] / drivers / scsi / aacraid / commctrl.c

/*
 *      Adaptec AAC series RAID controller driver
 *      (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
 *
 * 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Module Name:
 *  commctrl.c
 *
 * Abstract: Contains all routines for control of the AFA comm layer
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/dma-mapping.h>
#include <linux/blkdev.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>

#include "aacraid.h"

/**
 *      ioctl_send_fib  -       send a FIB from userspace
 *      @dev:   adapter is being processed
 *      @arg:   arguments to the ioctl call
 *      
 *      This routine sends a fib to the adapter on behalf of a user level
 *      program.
 */
 
static int ioctl_send_fib(struct aac_dev * dev, void __user *arg)
{
        struct hw_fib * kfib;
        struct fib *fibptr;

        fibptr = fib_alloc(dev);
        if(fibptr == NULL)
                return -ENOMEM;
                
        kfib = fibptr->hw_fib;
        /*
         *      First copy in the header so that we can check the size field.
         */
        if (copy_from_user((void *)kfib, arg, sizeof(struct aac_fibhdr))) {
                fib_free(fibptr);
                return -EFAULT;
        }
        /*
         *      Since we copy based on the fib header size, make sure that we
         *      will not overrun the buffer when we copy the memory. Return
         *      an error if we would.
         */
        if (le16_to_cpu(kfib->header.Size) > 
                        sizeof(struct hw_fib) - sizeof(struct aac_fibhdr)) {
                fib_free(fibptr);
                return -EINVAL;
        }

        if (copy_from_user(kfib, arg, le16_to_cpu(kfib->header.Size) +
                                sizeof(struct aac_fibhdr))) {
                fib_free(fibptr);
                return -EFAULT;
        }

        if (kfib->header.Command == cpu_to_le32(TakeABreakPt)) {
                aac_adapter_interrupt(dev);
                /*
                 * Since we didn't really send a fib, zero out the state to allow 
                 * cleanup code not to assert.
                 */
                kfib->header.XferState = 0;
        } else {
                int retval = fib_send(kfib->header.Command, fibptr,
                                le16_to_cpu(kfib->header.Size) , FsaNormal,
                                1, 1, NULL, NULL);
                if (retval) {
                        fib_free(fibptr);
                        return retval;
                }
                if (fib_complete(fibptr) != 0) {
                        fib_free(fibptr);
                        return -EINVAL;
                }
        }
        /*
         *      Make sure that the size returned by the adapter (which includes
         *      the header) is less than or equal to the size of a fib, so we
         *      don't corrupt application data. Then copy that size to the user
         *      buffer. (Don't try to add the header information again, since it
         *      was already included by the adapter.)
         */

        if (copy_to_user(arg, (void *)kfib, kfib->header.Size)) {
                fib_free(fibptr);
                return -EFAULT;
        }
        fib_free(fibptr);
        return 0;
}

/**
 *      open_getadapter_fib     -       Get the next fib
 *
 *      This routine will get the next Fib, if available, from the AdapterFibContext
 *      passed in from the user.
 */

static int open_getadapter_fib(struct aac_dev * dev, void __user *arg)
{
        struct aac_fib_context * fibctx;
        int status;

        fibctx = kmalloc(sizeof(struct aac_fib_context), GFP_KERNEL);
        if (fibctx == NULL) {
                status = -ENOMEM;
        } else {
                unsigned long flags;
                struct list_head * entry;
                struct aac_fib_context * context;

                fibctx->type = FSAFS_NTC_GET_ADAPTER_FIB_CONTEXT;
                fibctx->size = sizeof(struct aac_fib_context);
                /*
                 *      Yes yes, I know this could be an index, but we have a
                 * better guarantee of uniqueness for the locked loop below.
                 * Without the aid of a persistent history, this also helps
                 * reduce the chance that the opaque context would be reused.
                 */
                fibctx->unique = (u32)((ulong)fibctx & 0xFFFFFFFF);
                /*
                 *      Initialize the mutex used to wait for the next AIF.
                 */
                init_MUTEX_LOCKED(&fibctx->wait_sem);
                fibctx->wait = 0;
                /*
                 *      Initialize the fibs and set the count of fibs on
                 *      the list to 0.
                 */
                fibctx->count = 0;
                INIT_LIST_HEAD(&fibctx->fib_list);
                fibctx->jiffies = jiffies/HZ;
                /*
                 *      Now add this context onto the adapter's 
                 *      AdapterFibContext list.
                 */
                spin_lock_irqsave(&dev->fib_lock, flags);
                /* Ensure that we have a unique identifier */
                entry = dev->fib_list.next;
                while (entry != &dev->fib_list) {
                        context = list_entry(entry, struct aac_fib_context, next);
                        if (context->unique == fibctx->unique) {
                                /* Not unique (32 bits) */
                                fibctx->unique++;
                                entry = dev->fib_list.next;
                        } else {
                                entry = entry->next;
                        }
                }
                list_add_tail(&fibctx->next, &dev->fib_list);
                spin_unlock_irqrestore(&dev->fib_lock, flags);
                if (copy_to_user(arg,  &fibctx->unique, 
                                                sizeof(fibctx->unique))) {
                        status = -EFAULT;
                } else {
                        status = 0;
                }       
        }
        return status;
}

/**
 *      next_getadapter_fib     -       get the next fib
 *      @dev: adapter to use
 *      @arg: ioctl argument
 *      
 *      This routine will get the next Fib, if available, from the AdapterFibContext
 *      passed in from the user.
 */

static int next_getadapter_fib(struct aac_dev * dev, void __user *arg)
{
        struct fib_ioctl f;
        struct fib *fib;
        struct aac_fib_context *fibctx;
        int status;
        struct list_head * entry;
        unsigned long flags;
        
        if(copy_from_user((void *)&f, arg, sizeof(struct fib_ioctl)))
                return -EFAULT;
        /*
         *      Verify that the HANDLE passed in was a valid AdapterFibContext
         *
         *      Search the list of AdapterFibContext addresses on the adapter
         *      to be sure this is a valid address
         */
        entry = dev->fib_list.next;
        fibctx = NULL;

        while (entry != &dev->fib_list) {
                fibctx = list_entry(entry, struct aac_fib_context, next);
                /*
                 *      Extract the AdapterFibContext from the Input parameters.
                 */
                if (fibctx->unique == f.fibctx) {   /* We found a winner */
                        break;
                }
                entry = entry->next;
                fibctx = NULL;
        }
        if (!fibctx) {
                dprintk ((KERN_INFO "Fib Context not found\n"));
                return -EINVAL;
        }

        if((fibctx->type != FSAFS_NTC_GET_ADAPTER_FIB_CONTEXT) ||
                 (fibctx->size != sizeof(struct aac_fib_context))) {
                dprintk ((KERN_INFO "Fib Context corrupt?\n"));
                return -EINVAL;
        }
        status = 0;
        spin_lock_irqsave(&dev->fib_lock, flags);
        /*
         *      If there are no fibs to send back, then either wait or return
         *      -EAGAIN
         */
return_fib:
        if (!list_empty(&fibctx->fib_list)) {
                struct list_head * entry;
                /*
                 *      Pull the next fib from the fibs
                 */
                entry = fibctx->fib_list.next;
                list_del(entry);
                
                fib = list_entry(entry, struct fib, fiblink);
                fibctx->count--;
                spin_unlock_irqrestore(&dev->fib_lock, flags);
                if (copy_to_user(f.fib, fib->hw_fib, sizeof(struct hw_fib))) {
                        kfree(fib->hw_fib);
                        kfree(fib);
                        return -EFAULT;
                }       
                /*
                 *      Free the space occupied by this copy of the fib.
                 */
                kfree(fib->hw_fib);
                kfree(fib);
                status = 0;
                fibctx->jiffies = jiffies/HZ;
        } else {
                spin_unlock_irqrestore(&dev->fib_lock, flags);
                if (f.wait) {
                        if(down_interruptible(&fibctx->wait_sem) < 0) {
                                status = -EINTR;
                        } else {
                                /* Lock again and retry */
                                spin_lock_irqsave(&dev->fib_lock, flags);
                                goto return_fib;
                        }
                } else {
                        status = -EAGAIN;
                }       
        }
        return status;
}

int aac_close_fib_context(struct aac_dev * dev, struct aac_fib_context * fibctx)
{
        struct fib *fib;

        /*
         *      First free any FIBs that have not been consumed.
         */
        while (!list_empty(&fibctx->fib_list)) {
                struct list_head * entry;
                /*
                 *      Pull the next fib from the fibs
                 */
                entry = fibctx->fib_list.next;
                list_del(entry);
                fib = list_entry(entry, struct fib, fiblink);
                fibctx->count--;
                /*
                 *      Free the space occupied by this copy of the fib.
                 */
                kfree(fib->hw_fib);
                kfree(fib);
        }
        /*
         *      Remove the Context from the AdapterFibContext List
         */
        list_del(&fibctx->next);
        /*
         *      Invalidate context
         */
        fibctx->type = 0;
        /*
         *      Free the space occupied by the Context
         */
        kfree(fibctx);
        return 0;
}

/**
 *      close_getadapter_fib    -       close down user fib context
 *      @dev: adapter
 *      @arg: ioctl arguments
 *
 *      This routine will close down the fibctx passed in from the user.
 */
 
static int close_getadapter_fib(struct aac_dev * dev, void __user *arg)
{
        struct aac_fib_context *fibctx;
        int status;
        unsigned long flags;
        struct list_head * entry;

        /*
         *      Verify that the HANDLE passed in was a valid AdapterFibContext
         *
         *      Search the list of AdapterFibContext addresses on the adapter
         *      to be sure this is a valid address
         */

        entry = dev->fib_list.next;
        fibctx = NULL;

        while(entry != &dev->fib_list) {
                fibctx = list_entry(entry, struct aac_fib_context, next);
                /*
                 *      Extract the fibctx from the input parameters
                 */
                if (fibctx->unique == (u32)(unsigned long)arg) {   
                        /* We found a winner */
                        break;
                }
                entry = entry->next;
                fibctx = NULL;
        }

        if (!fibctx)
                return 0; /* Already gone */

        if((fibctx->type != FSAFS_NTC_GET_ADAPTER_FIB_CONTEXT) ||
                 (fibctx->size != sizeof(struct aac_fib_context)))
                return -EINVAL;
        spin_lock_irqsave(&dev->fib_lock, flags);
        status = aac_close_fib_context(dev, fibctx);
        spin_unlock_irqrestore(&dev->fib_lock, flags);
        return status;
}

/**
 *      check_revision  -       close down user fib context
 *      @dev: adapter
 *      @arg: ioctl arguments
 *
 *      This routine returns the driver version.
 *      Under Linux, there have been no version incompatibilities, so this is 
 *      simple!
 */

static int check_revision(struct aac_dev *dev, void __user *arg)
{
        struct revision response;

        response.compat = 1;
        response.version = dev->adapter_info.kernelrev;
        response.build = dev->adapter_info.kernelbuild;

        if (copy_to_user(arg, &response, sizeof(response)))
                return -EFAULT;
        return 0;
}

/**
 *
 * aac_send_raw_scb
 *
 */

int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
{
        struct fib* srbfib;
        int status;
        struct aac_srb *srbcmd;
        struct aac_srb __user *user_srb = arg;
        struct aac_srb_reply __user *user_reply;
        struct aac_srb_reply* reply;
        u32 fibsize = 0;
        u32 flags = 0;
        s32 rcode = 0;
        u32 data_dir;
        void __user *sg_user[32];
        void *sg_list[32];
        u32   sg_indx = 0;
        u32 byte_count = 0;
        u32 actual_fibsize = 0;
        int i;


        if (!capable(CAP_SYS_ADMIN)){
                printk(KERN_DEBUG"aacraid: No permission to send raw srb\n"); 
                return -EPERM;
        }
        /*
         *      Allocate and initialize a Fib then setup a BlockWrite command
         */
        if (!(srbfib = fib_alloc(dev))) {
                return -1;
        }
        fib_init(srbfib);

        srbcmd = (struct aac_srb*) fib_data(srbfib);

        if(copy_from_user(&fibsize, &user_srb->count,sizeof(u32))){
                printk(KERN_DEBUG"aacraid: Could not copy data size from user\n"); 
                rcode = -EFAULT;
                goto cleanup;
        }

        if (fibsize > FIB_DATA_SIZE_IN_BYTES) {
                rcode = -EINVAL;
                goto cleanup;
        }

        if(copy_from_user(srbcmd, user_srb,fibsize)){
                printk(KERN_DEBUG"aacraid: Could not copy srb from user\n"); 
                rcode = -EFAULT;
                goto cleanup;
        }

        user_reply = arg+fibsize;

        flags = srbcmd->flags;
        // Fix up srb for endian and force some values
        srbcmd->function = cpu_to_le32(SRBF_ExecuteScsi);       // Force this
        srbcmd->channel  = cpu_to_le32(srbcmd->channel);
        srbcmd->id       = cpu_to_le32(srbcmd->id);
        srbcmd->lun      = cpu_to_le32(srbcmd->lun);
        srbcmd->flags    = cpu_to_le32(srbcmd->flags);
        srbcmd->timeout  = cpu_to_le32(srbcmd->timeout);
        srbcmd->retry_limit =cpu_to_le32(0); // Obsolete parameter
        srbcmd->cdb_size = cpu_to_le32(srbcmd->cdb_size);
        
        switch (srbcmd->flags & (SRB_DataIn | SRB_DataOut)) {
        case SRB_DataOut:
                data_dir = DMA_TO_DEVICE;
                break;
        case (SRB_DataIn | SRB_DataOut):
                data_dir = DMA_BIDIRECTIONAL;
                break;
        case SRB_DataIn:
                data_dir = DMA_FROM_DEVICE;
                break;
        default:
                data_dir = DMA_NONE;
        }
        if (dev->dac_support == 1) {
                struct sgmap64* psg = (struct sgmap64*)&srbcmd->sg;
                byte_count = 0;

                /*
                 * This should also catch if user used the 32 bit sgmap
                 */
                actual_fibsize = sizeof(struct aac_srb) - 
                        sizeof(struct sgentry) + ((srbcmd->sg.count & 0xff) * 
                                sizeof(struct sgentry64));
                if(actual_fibsize != fibsize){ // User made a mistake - should not continue
                        printk(KERN_DEBUG"aacraid: Bad Size specified in Raw SRB command\n");
                        rcode = -EINVAL;
                        goto cleanup;
                }
                if ((data_dir == DMA_NONE) && psg->count) { 
                        printk(KERN_DEBUG"aacraid: SG with no direction specified in Raw SRB command\n");
                        rcode = -EINVAL;
                        goto cleanup;
                }

                for (i = 0; i < psg->count; i++) {
                        dma_addr_t addr; 
                        u64 le_addr;
                        void* p;
                        p = kmalloc(psg->sg[i].count,GFP_KERNEL|__GFP_DMA);
                        if(p == 0) {
                                printk(KERN_DEBUG"aacraid: Could not allocate SG buffer - size = %d buffer number %d of %d\n",
                                psg->sg[i].count,i,psg->count);
                                rcode = -ENOMEM;
                                goto cleanup;
                        }
                        sg_user[i] = (void __user *)psg->sg[i].addr;
                        sg_list[i] = p; // save so we can clean up later
                        sg_indx = i;

                        if( flags & SRB_DataOut ){
                                if(copy_from_user(p,sg_user[i],psg->sg[i].count)){
                                        printk(KERN_DEBUG"aacraid: Could not copy sg data from user\n"); 
                                        rcode = -EFAULT;
                                        goto cleanup;
                                }
                        }
                        addr = pci_map_single(dev->pdev, p, psg->sg[i].count, data_dir);

                        le_addr = cpu_to_le64(addr);
                        psg->sg[i].addr[1] = (u32)(le_addr>>32);
                        psg->sg[i].addr[0] = (u32)(le_addr & 0xffffffff);
                        psg->sg[i].count = cpu_to_le32(psg->sg[i].count);  
                        byte_count += psg->sg[i].count;
                }

                srbcmd->count = cpu_to_le32(byte_count);
                status = fib_send(ScsiPortCommand64, srbfib, actual_fibsize, FsaNormal, 1, 1,NULL,NULL);
        } else {
                struct sgmap* psg = &srbcmd->sg;
                byte_count = 0;

                actual_fibsize = sizeof (struct aac_srb) + 
                        (((le32_to_cpu(srbcmd->sg.count) & 0xff) - 1) * 
                         sizeof (struct sgentry));
                if(actual_fibsize != fibsize){ // User made a mistake - should not continue
                        printk(KERN_DEBUG"aacraid: Bad Size specified in Raw SRB command\n");
                        rcode = -EINVAL;
                        goto cleanup;
                }
                if ((data_dir == DMA_NONE) && psg->count) {
                        printk(KERN_DEBUG"aacraid: SG with no direction specified in Raw SRB command\n");
                        rcode = -EINVAL;
                        goto cleanup;
                }
                for (i = 0; i < psg->count; i++) {
                        dma_addr_t addr; 
                        void* p;
                        p = kmalloc(psg->sg[i].count,GFP_KERNEL);
                        if(p == 0) {
                                printk(KERN_DEBUG"aacraid: Could not allocate SG buffer - size = %d buffer number %d of %d\n",
                                psg->sg[i].count,i,psg->count);
                                rcode = -ENOMEM;
                                goto cleanup;
                        }
                        sg_user[i] = (void __user *)(psg->sg[i].addr);
                        sg_list[i] = p; // save so we can clean up later
                        sg_indx = i;

                        if( flags & SRB_DataOut ){
                                if(copy_from_user(p,sg_user[i],psg->sg[i].count)){
                                        printk(KERN_DEBUG"aacraid: Could not copy sg data from user\n"); 
                                        rcode = -EFAULT;
                                        goto cleanup;
                                }
                        }
                        addr = pci_map_single(dev->pdev, p, psg->sg[i].count, data_dir);

                        psg->sg[i].addr = cpu_to_le32(addr);
                        psg->sg[i].count = cpu_to_le32(psg->sg[i].count);  
                        byte_count += psg->sg[i].count;
                }
                srbcmd->count = cpu_to_le32(byte_count);
                status = fib_send(ScsiPortCommand, srbfib, actual_fibsize, FsaNormal, 1, 1, NULL, NULL);
        }

        if (status != 0){
                printk(KERN_DEBUG"aacraid: Could not send raw srb fib to hba\n"); 
                rcode = -1;
                goto cleanup;
        }

        if( flags & SRB_DataIn ) {
                for(i = 0 ; i <= sg_indx; i++){
                        if(copy_to_user(sg_user[i],sg_list[i],le32_to_cpu(srbcmd->sg.sg[i].count))){
                                printk(KERN_DEBUG"aacraid: Could not copy sg data to user\n"); 
                                rcode = -EFAULT;
                                goto cleanup;

                        }
                }
        }

        reply = (struct aac_srb_reply *) fib_data(srbfib);
        if(copy_to_user(user_reply,reply,sizeof(struct aac_srb_reply))){
                printk(KERN_DEBUG"aacraid: Could not copy reply to user\n"); 
                rcode = -EFAULT;
                goto cleanup;
        }

cleanup:
        for(i=0; i <= sg_indx; i++){
                kfree(sg_list[i]);
        }
        fib_complete(srbfib);
        fib_free(srbfib);

        return rcode;
}


struct aac_pci_info {
        u32 bus;
        u32 slot;
};


int aac_get_pci_info(struct aac_dev* dev, void __user *arg)
{
        struct aac_pci_info pci_info;

        pci_info.bus = dev->pdev->bus->number;
        pci_info.slot = PCI_SLOT(dev->pdev->devfn);

       if (copy_to_user(arg, &pci_info, sizeof(struct aac_pci_info))) {
                printk(KERN_DEBUG "aacraid: Could not copy pci info\n");
               return -EFAULT;
        }
        return 0;
 }
 

int aac_do_ioctl(struct aac_dev * dev, int cmd, void __user *arg)
{
        int status;
        
        /*
         *      HBA gets first crack
         */
         
        status = aac_dev_ioctl(dev, cmd, arg);
        if(status != -ENOTTY)
                return status;

        switch (cmd) {
        case FSACTL_MINIPORT_REV_CHECK:
                status = check_revision(dev, arg);
                break;
        case FSACTL_SENDFIB:
                status = ioctl_send_fib(dev, arg);
                break;
        case FSACTL_OPEN_GET_ADAPTER_FIB:
                status = open_getadapter_fib(dev, arg);
                break;
        case FSACTL_GET_NEXT_ADAPTER_FIB:
                status = next_getadapter_fib(dev, arg);
                break;
        case FSACTL_CLOSE_GET_ADAPTER_FIB:
                status = close_getadapter_fib(dev, arg);
                break;
        case FSACTL_SEND_RAW_SRB:
                status = aac_send_raw_srb(dev,arg);
                break;
        case FSACTL_GET_PCI_INFO:
                status = aac_get_pci_info(dev,arg);
                break;
        default:
                status = -ENOTTY;
                break;  
        }
        return status;
}