path: root/drivers/scsi/aacraid/commctrl.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Adaptec AAC series RAID controller driver
 *	(c) Copyright 2001 Red Hat Inc.
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000-2010 Adaptec, Inc.
 *               2010-2015 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
 *		 2016-2017 Microsemi Corp. (aacraid@microsemi.com)
 *
 * 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/pci.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/dma-mapping.h>
#include <linux/blkdev.h>
#include <linux/compat.h>
#include <linux/delay.h> /* ssleep prototype */
#include <linux/kthread.h>
#include <linux/uaccess.h>
#include <scsi/scsi_host.h>

#include "aacraid.h"

# define AAC_DEBUG_PREAMBLE	KERN_INFO
# define AAC_DEBUG_POSTAMBLE
/**
 *	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;
	struct hw_fib * hw_fib = (struct hw_fib *)0;
	dma_addr_t hw_fib_pa = (dma_addr_t)0LL;
	unsigned int size, osize;
	int retval;

	if (dev->in_reset) {
		return -EBUSY;
	}
	fibptr = aac_fib_alloc(dev);
	if(fibptr == NULL) {
		return -ENOMEM;
	}

	kfib = fibptr->hw_fib_va;
	/*
	 *	First copy in the header so that we can check the size field.
	 */
	if (copy_from_user((void *)kfib, arg, sizeof(struct aac_fibhdr))) {
		aac_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.
	 */
	osize = 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) {
		dma_addr_t daddr;

		if (size > 2048) {
			retval = -EINVAL;
			goto cleanup;
		}

		kfib = dma_alloc_coherent(&dev->pdev->dev, size, &daddr,
					  GFP_KERNEL);
		if (!kfib) {
			retval = -ENOMEM;
			goto cleanup;
		}

		/* Highjack the hw_fib */
		hw_fib = fibptr->hw_fib_va;
		hw_fib_pa = fibptr->hw_fib_pa;
		fibptr->hw_fib_va = kfib;
		fibptr->hw_fib_pa = daddr;
		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;
	}

	/* Sanity check the second copy */
	if ((osize != le16_to_cpu(kfib->header.Size) +
		sizeof(struct aac_fibhdr))
		|| (size < le16_to_cpu(kfib->header.SenderSize))) {
		retval = -EINVAL;
		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 = aac_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 (aac_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) {
		dma_free_coherent(&dev->pdev->dev, size, kfib,
				  fibptr->hw_fib_pa);
		fibptr->hw_fib_pa = hw_fib_pa;
		fibptr->hw_fib_va = hw_fib;
	}
	if (retval != -ERESTARTSYS)
		aac_fib_free(fibptr);
	return retval;
}

/**
 *	open_getadapter_fib	-	Get the next fib
 *	@dev:	adapter is being processed
 *	@arg:	arguments to the open call
 *
 *	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