drivers/scsi/aacraid/dpcsup.c - maze/linux - Git at Google

 /*
  *	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) 2000-2007 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:
  *  dpcsup.c
  *
  * Abstract: All DPC processing routines for the cyclone board occur here.
  *
  *
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <linux/completion.h>
 #include <linux/blkdev.h>
 #include <asm/semaphore.h>

 #include "aacraid.h"

 /**
  *	aac_response_normal	-	Handle command replies
  *	@q: Queue to read from
  *
  *	This DPC routine will be run when the adapter interrupts us to let us
  *	know there is a response on our normal priority queue. We will pull off
  *	all QE there are and wake up all the waiters before exiting. We will
  *	take a spinlock out on the queue before operating on it.
  */

 unsigned int aac_response_normal(struct aac_queue * q)
 {
 	struct aac_dev * dev = q->dev;
 	struct aac_entry *entry;
 	struct hw_fib * hwfib;
 	struct fib * fib;
 	int consumed = 0;
 	unsigned long flags;

 	spin_lock_irqsave(q->lock, flags);
 	/*
 	 *	Keep pulling response QEs off the response queue and waking
 	 *	up the waiters until there are no more QEs. We then return
 	 *	back to the system. If no response was requesed we just
 	 *	deallocate the Fib here and continue.
 	 */
 	while(aac_consumer_get(dev, q, &entry))
 	{
 		int fast;
 		u32 index = le32_to_cpu(entry->addr);
 		fast = index & 0x01;
 		fib = &dev->fibs[index >> 2];
 		hwfib = fib->hw_fib_va;

 		aac_consumer_free(dev, q, HostNormRespQueue);
 		/*
 		 *	Remove this fib from the Outstanding I/O queue.
 		 *	But only if it has not already been timed out.
 		 *
 		 *	If the fib has been timed out already, then just
 		 *	continue. The caller has already been notified that
 		 *	the fib timed out.
 		 */
 		dev->queues->queue[AdapNormCmdQueue].numpending--;

 		if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
 			spin_unlock_irqrestore(q->lock, flags);
 			aac_fib_complete(fib);
 			aac_fib_free(fib);
 			spin_lock_irqsave(q->lock, flags);
 			continue;
 		}
 		spin_unlock_irqrestore(q->lock, flags);

 		if (fast) {
 			/*
 			 *	Doctor the fib
 			 */
 			*(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
 			hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 		}

 		FIB_COUNTER_INCREMENT(aac_config.FibRecved);

 		if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 		{
 			__le32 *pstatus = (__le32 *)hwfib->data;
 			if (*pstatus & cpu_to_le32(0xffff0000))
 				*pstatus = cpu_to_le32(ST_OK);
 		}
 		if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 		{
 	        	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 				FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 			else
 				FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 			/*
 			 *	NOTE:  we cannot touch the fib after this
 			 *	    call, because it may have been deallocated.
 			 */
 			fib->callback(fib->callback_data, fib);
 		} else {
 			unsigned long flagv;
 			spin_lock_irqsave(&fib->event_lock, flagv);
 			if (!fib->done)
 				fib->done = 1;
 			up(&fib->event_wait);
 			spin_unlock_irqrestore(&fib->event_lock, flagv);
 			FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 			if (fib->done == 2) {
 				aac_fib_complete(fib);
 				aac_fib_free(fib);
 			}
 		}
 		consumed++;
 		spin_lock_irqsave(q->lock, flags);
 	}

 	if (consumed > aac_config.peak_fibs)
 		aac_config.peak_fibs = consumed;
 	if (consumed == 0)
 		aac_config.zero_fibs++;

 	spin_unlock_irqrestore(q->lock, flags);
 	return 0;
 }


 /**
  *	aac_command_normal	-	handle commands
  *	@q: queue to process
  *
  *	This DPC routine will be queued when the adapter interrupts us to
  *	let us know there is a command on our normal priority queue. We will
  *	pull off all QE there are and wake up all the waiters before exiting.
  *	We will take a spinlock out on the queue before operating on it.
  */

 unsigned int aac_command_normal(struct aac_queue *q)
 {
 	struct aac_dev * dev = q->dev;
 	struct aac_entry *entry;
 	unsigned long flags;

 	spin_lock_irqsave(q->lock, flags);

 	/*
 	 *	Keep pulling response QEs off the response queue and waking
 	 *	up the waiters until there are no more QEs. We then return
 	 *	back to the system.
 	 */
 	while(aac_consumer_get(dev, q, &entry))
 	{
 		struct fib fibctx;
 		struct hw_fib * hw_fib;
 		u32 index;
 		struct fib *fib = &fibctx;

 		index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
 		hw_fib = &dev->aif_base_va[index];

 		/*
 		 *	Allocate a FIB at all costs. For non queued stuff
 		 *	we can just use the stack so we are happy. We need
 		 *	a fib object in order to manage the linked lists
 		 */
 		if (dev->aif_thread)
 			if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
 				fib = &fibctx;

 		memset(fib, 0, sizeof(struct fib));
 		INIT_LIST_HEAD(&fib->fiblink);
 		fib->type = FSAFS_NTC_FIB_CONTEXT;
 		fib->size = sizeof(struct fib);
 		fib->hw_fib_va = hw_fib;
 		fib->data = hw_fib->data;
 		fib->dev = dev;


 		if (dev->aif_thread && fib != &fibctx) {
 		        list_add_tail(&fib->fiblink, &q->cmdq);
 	 	        aac_consumer_free(dev, q, HostNormCmdQueue);
 		        wake_up_interruptible(&q->cmdready);
 		} else {
 	 	        aac_consumer_free(dev, q, HostNormCmdQueue);
 			spin_unlock_irqrestore(q->lock, flags);
 			/*
 			 *	Set the status of this FIB
 			 */
 			*(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
 			aac_fib_adapter_complete(fib, sizeof(u32));
 			spin_lock_irqsave(q->lock, flags);
 		}
 	}
 	spin_unlock_irqrestore(q->lock, flags);
 	return 0;
 }


 /**
  *	aac_intr_normal	-	Handle command replies
  *	@dev: Device
  *	@index: completion reference
  *
  *	This DPC routine will be run when the adapter interrupts us to let us
  *	know there is a response on our normal priority queue. We will pull off
  *	all QE there are and wake up all the waiters before exiting.
  */

 unsigned int aac_intr_normal(struct aac_dev *dev, u32 index)
 {
 	dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, index));
 	if ((index & 0x00000002L)) {
 		struct hw_fib * hw_fib;
 		struct fib * fib;
 		struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
 		unsigned long flags;

 		if (index == 0xFFFFFFFEL) /* Special Case */
 			return 0;	  /* Do nothing */
 		/*
 		 *	Allocate a FIB. For non queued stuff we can just use
 		 * the stack so we are happy. We need a fib object in order to
 		 * manage the linked lists.
 		 */
 		if ((!dev->aif_thread)
 		 || (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
 			return 1;
 		if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
 			kfree (fib);
 			return 1;
 		}
 		memcpy(hw_fib, (struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
 		  (index & ~0x00000002L)), sizeof(struct hw_fib));
 		INIT_LIST_HEAD(&fib->fiblink);
 		fib->type = FSAFS_NTC_FIB_CONTEXT;
 		fib->size = sizeof(struct fib);
 		fib->hw_fib_va = hw_fib;
 		fib->data = hw_fib->data;
 		fib->dev = dev;

 		spin_lock_irqsave(q->lock, flags);
 		list_add_tail(&fib->fiblink, &q->cmdq);
 	        wake_up_interruptible(&q->cmdready);
 		spin_unlock_irqrestore(q->lock, flags);
 		return 1;
 	} else {
 		int fast = index & 0x01;
 		struct fib * fib = &dev->fibs[index >> 2];
 		struct hw_fib * hwfib = fib->hw_fib_va;

 		/*
 		 *	Remove this fib from the Outstanding I/O queue.
 		 *	But only if it has not already been timed out.
 		 *
 		 *	If the fib has been timed out already, then just
 		 *	continue. The caller has already been notified that
 		 *	the fib timed out.
 		 */
 		dev->queues->queue[AdapNormCmdQueue].numpending--;

 		if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
 			aac_fib_complete(fib);
 			aac_fib_free(fib);
 			return 0;
 		}

 		if (fast) {
 			/*
 			 *	Doctor the fib
 			 */
 			*(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
 			hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 		}

 		FIB_COUNTER_INCREMENT(aac_config.FibRecved);

 		if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 		{
 			__le32 *pstatus = (__le32 *)hwfib->data;
 			if (*pstatus & cpu_to_le32(0xffff0000))
 				*pstatus = cpu_to_le32(ST_OK);
 		}
 		if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 		{
 	        	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 				FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 			else
 				FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 			/*
 			 *	NOTE:  we cannot touch the fib after this
 			 *	    call, because it may have been deallocated.
 			 */
 			fib->callback(fib->callback_data, fib);
 		} else {
 			unsigned long flagv;
 	  		dprintk((KERN_INFO "event_wait up\n"));
 			spin_lock_irqsave(&fib->event_lock, flagv);
 			if (!fib->done)
 				fib->done = 1;
 			up(&fib->event_wait);
 			spin_unlock_irqrestore(&fib->event_lock, flagv);
 			FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 		}
 		return 0;
 	}
 }
	/*
	* 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) 2000-2007 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:
	* dpcsup.c
	*
	* Abstract: All DPC processing routines for the cyclone board occur here.
	*
	*
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/spinlock.h>
	#include <linux/slab.h>
	#include <linux/completion.h>
	#include <linux/blkdev.h>
	#include <asm/semaphore.h>

	#include "aacraid.h"

	/**
	* aac_response_normal - Handle command replies
	* @q: Queue to read from
	*
	* This DPC routine will be run when the adapter interrupts us to let us
	* know there is a response on our normal priority queue. We will pull off
	* all QE there are and wake up all the waiters before exiting. We will
	* take a spinlock out on the queue before operating on it.
	*/

	unsigned int aac_response_normal(struct aac_queue * q)
	{
	struct aac_dev * dev = q->dev;
	struct aac_entry *entry;
	struct hw_fib * hwfib;
	struct fib * fib;
	int consumed = 0;
	unsigned long flags;

	spin_lock_irqsave(q->lock, flags);
	/*
	* Keep pulling response QEs off the response queue and waking
	* up the waiters until there are no more QEs. We then return
	* back to the system. If no response was requesed we just
	* deallocate the Fib here and continue.
	*/
	while(aac_consumer_get(dev, q, &entry))
	{
	int fast;
	u32 index = le32_to_cpu(entry->addr);
	fast = index & 0x01;
	fib = &dev->fibs[index >> 2];
	hwfib = fib->hw_fib_va;

	aac_consumer_free(dev, q, HostNormRespQueue);
	/*
	* Remove this fib from the Outstanding I/O queue.
	* But only if it has not already been timed out.
	*
	* If the fib has been timed out already, then just
	* continue. The caller has already been notified that
	* the fib timed out.
	*/
	dev->queues->queue[AdapNormCmdQueue].numpending--;

	if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
	spin_unlock_irqrestore(q->lock, flags);
	aac_fib_complete(fib);
	aac_fib_free(fib);
	spin_lock_irqsave(q->lock, flags);
	continue;
	}
	spin_unlock_irqrestore(q->lock, flags);

	if (fast) {
	/*
	* Doctor the fib
	*/
	(__le32 )hwfib->data = cpu_to_le32(ST_OK);
	hwfib->header.XferState \|= cpu_to_le32(AdapterProcessed);
	}

	FIB_COUNTER_INCREMENT(aac_config.FibRecved);

	if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
	{
	__le32 pstatus = (__le32 )hwfib->data;
	if (*pstatus & cpu_to_le32(0xffff0000))
	*pstatus = cpu_to_le32(ST_OK);
	}
	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected \| Async))
	{
	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
	FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
	else
	FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
	/*
	* NOTE: we cannot touch the fib after this
	* call, because it may have been deallocated.
	*/
	fib->callback(fib->callback_data, fib);
	} else {
	unsigned long flagv;
	spin_lock_irqsave(&fib->event_lock, flagv);
	if (!fib->done)
	fib->done = 1;
	up(&fib->event_wait);
	spin_unlock_irqrestore(&fib->event_lock, flagv);
	FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
	if (fib->done == 2) {
	aac_fib_complete(fib);
	aac_fib_free(fib);
	}
	}
	consumed++;
	spin_lock_irqsave(q->lock, flags);
	}

	if (consumed > aac_config.peak_fibs)
	aac_config.peak_fibs = consumed;
	if (consumed == 0)
	aac_config.zero_fibs++;

	spin_unlock_irqrestore(q->lock, flags);
	return 0;
	}


	/**
	* aac_command_normal - handle commands
	* @q: queue to process
	*
	* This DPC routine will be queued when the adapter interrupts us to
	* let us know there is a command on our normal priority queue. We will
	* pull off all QE there are and wake up all the waiters before exiting.
	* We will take a spinlock out on the queue before operating on it.
	*/

	unsigned int aac_command_normal(struct aac_queue *q)
	{
	struct aac_dev * dev = q->dev;
	struct aac_entry *entry;
	unsigned long flags;

	spin_lock_irqsave(q->lock, flags);

	/*
	* Keep pulling response QEs off the response queue and waking
	* up the waiters until there are no more QEs. We then return
	* back to the system.
	*/
	while(aac_consumer_get(dev, q, &entry))
	{
	struct fib fibctx;
	struct hw_fib * hw_fib;
	u32 index;
	struct fib *fib = &fibctx;

	index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
	hw_fib = &dev->aif_base_va[index];

	/*
	* Allocate a FIB at all costs. For non queued stuff
	* we can just use the stack so we are happy. We need
	* a fib object in order to manage the linked lists
	*/
	if (dev->aif_thread)
	if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
	fib = &fibctx;

	memset(fib, 0, sizeof(struct fib));
	INIT_LIST_HEAD(&fib->fiblink);
	fib->type = FSAFS_NTC_FIB_CONTEXT;
	fib->size = sizeof(struct fib);
	fib->hw_fib_va = hw_fib;
	fib->data = hw_fib->data;
	fib->dev = dev;


	if (dev->aif_thread && fib != &fibctx) {
	list_add_tail(&fib->fiblink, &q->cmdq);
	aac_consumer_free(dev, q, HostNormCmdQueue);
	wake_up_interruptible(&q->cmdready);
	} else {
	aac_consumer_free(dev, q, HostNormCmdQueue);
	spin_unlock_irqrestore(q->lock, flags);
	/*
	* Set the status of this FIB
	*/
	(__le32 )hw_fib->data = cpu_to_le32(ST_OK);
	aac_fib_adapter_complete(fib, sizeof(u32));
	spin_lock_irqsave(q->lock, flags);
	}
	}
	spin_unlock_irqrestore(q->lock, flags);
	return 0;
	}


	/**
	* aac_intr_normal - Handle command replies
	* @dev: Device
	* @index: completion reference
	*
	* This DPC routine will be run when the adapter interrupts us to let us
	* know there is a response on our normal priority queue. We will pull off
	* all QE there are and wake up all the waiters before exiting.
	*/

	unsigned int aac_intr_normal(struct aac_dev *dev, u32 index)
	{
	dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, index));
	if ((index & 0x00000002L)) {
	struct hw_fib * hw_fib;
	struct fib * fib;
	struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
	unsigned long flags;

	if (index == 0xFFFFFFFEL) /* Special Case */
	return 0; /* Do nothing */
	/*
	* Allocate a FIB. For non queued stuff we can just use
	* the stack so we are happy. We need a fib object in order to
	* manage the linked lists.
	*/
	if ((!dev->aif_thread)
	\|\| (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
	return 1;
	if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
	kfree (fib);
	return 1;
	}
	memcpy(hw_fib, (struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
	(index & ~0x00000002L)), sizeof(struct hw_fib));
	INIT_LIST_HEAD(&fib->fiblink);
	fib->type = FSAFS_NTC_FIB_CONTEXT;
	fib->size = sizeof(struct fib);
	fib->hw_fib_va = hw_fib;
	fib->data = hw_fib->data;
	fib->dev = dev;

	spin_lock_irqsave(q->lock, flags);
	list_add_tail(&fib->fiblink, &q->cmdq);
	wake_up_interruptible(&q->cmdready);
	spin_unlock_irqrestore(q->lock, flags);
	return 1;
	} else {
	int fast = index & 0x01;
	struct fib * fib = &dev->fibs[index >> 2];
	struct hw_fib * hwfib = fib->hw_fib_va;

	/*
	* Remove this fib from the Outstanding I/O queue.
	* But only if it has not already been timed out.
	*
	* If the fib has been timed out already, then just
	* continue. The caller has already been notified that
	* the fib timed out.
	*/
	dev->queues->queue[AdapNormCmdQueue].numpending--;

	if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
	aac_fib_complete(fib);
	aac_fib_free(fib);
	return 0;
	}

	if (fast) {
	/*
	* Doctor the fib
	*/
	(__le32 )hwfib->data = cpu_to_le32(ST_OK);
	hwfib->header.XferState \|= cpu_to_le32(AdapterProcessed);
	}

	FIB_COUNTER_INCREMENT(aac_config.FibRecved);

	if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
	{
	__le32 pstatus = (__le32 )hwfib->data;
	if (*pstatus & cpu_to_le32(0xffff0000))
	*pstatus = cpu_to_le32(ST_OK);
	}
	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected \| Async))
	{
	if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
	FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
	else
	FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
	/*
	* NOTE: we cannot touch the fib after this
	* call, because it may have been deallocated.
	*/
	fib->callback(fib->callback_data, fib);
	} else {
	unsigned long flagv;
	dprintk((KERN_INFO "event_wait up\n"));
	spin_lock_irqsave(&fib->event_lock, flagv);
	if (!fib->done)
	fib->done = 1;
	up(&fib->event_wait);
	spin_unlock_irqrestore(&fib->event_lock, flagv);
	FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
	}
	return 0;
	}
	}