commctrl.c

linux-2.6.15.6

/*
 *	Adaptec AAC series RAID controller driver
 *	(c) Copyright 2001 Red Hat Inc.	<[e-mail]>
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000 Adaptec, Inc. ([e-mail])
 *
 * 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.
 */
# define AAC_DEBUG_PREAMBLE	KERN_INFO
# define AAC_DEBUG_POSTAMBLE
 
static int ioctl_send_fib(struct aac_dev * dev, void __user *arg)
{
	struct hw_fib * kfib;
	struct fib *fibptr;
	struct hw_fib * hw_fib = (struct hw_fib *)0;
	dma_addr_t hw_fib_pa = (dma_addr_t)0LL;
	unsigned size;
	int retval;

	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.
	 */
	size = le16_to_cpu(kfib->header.Size) + sizeof(struct aac_fibhdr);
	if (size < le16_to_cpu(kfib->header.SenderSize))
		size = le16_to_cpu(kfib->header.SenderSize);
	if (size > dev->max_fib_size) {
		/* Highjack the hw_fib */
		hw_fib = fibptr->hw_fib;
		hw_fib_pa = fibptr->hw_fib_pa;
		fibptr->hw_fib = kfib = pci_alloc_consistent(dev->pdev, size, &fibptr->hw_fib_pa);
		memset(((char *)kfib) + dev->max_fib_size, 0, size - dev->max_fib_size);
		memcpy(kfib, hw_fib, dev->max_fib_size);
	}

	if (copy_from_user(kfib, arg, size)) {
		retval = -EFAULT;
		goto cleanup;
	}

	if (kfib->header.Command == cpu_to_le16(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 {
		retval = fib_send(le16_to_cpu(kfib->header.Command), fibptr,
				le16_to_cpu(kfib->header.Size) , FsaNormal,
				1, 1, NULL, NULL);
		if (retval) {
			goto cleanup;
		}
		if (fib_complete(fibptr) != 0) {
			retval = -EINVAL;
			goto cleanup;
		}
	}
	/*
	 *	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.)
	 */

	retval = 0;
	if (copy_to_user(arg, (void *)kfib, size))
		retval = -EFAULT;
cleanup:
	if (hw_fib) {
		pci_free_consistent(dev->pdev, size, kfib, fibptr->hw_fib_pa);
		fibptr->hw_fib_pa = hw_fib_pa;
		fibptr->hw_fib = hw_fib;
	}
	fib_free(fibptr);
	return retval;
}

/**
 *	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;
	} 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;
		}	
	}
	fibctx->jiffies = jiffies/HZ;
	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 */