commsup.c
上传用户:lgb322
上传日期:2013-02-24
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文件大小:26k
- /*
- * 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:
- * commsup.c
- *
- * Abstract: Contain all routines that are required for FSA host/adapter
- * commuication.
- *
- *
- */
- #include <linux/config.h>
- #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 <asm/semaphore.h>
- #include <linux/blk.h>
- #include "scsi.h"
- #include "hosts.h"
- #include "aacraid.h"
- /**
- * fib_map_alloc - allocate the fib objects
- * @dev: Adapter to allocate for
- *
- * Allocate and map the shared PCI space for the FIB blocks used to
- * talk to the Adaptec firmware.
- */
-
- static int fib_map_alloc(struct aac_dev *dev)
- {
- if((dev->hw_fib_va = pci_alloc_consistent(dev->pdev, sizeof(struct hw_fib) * AAC_NUM_FIB, &dev->hw_fib_pa))==NULL)
- return -ENOMEM;
- return 0;
- }
- /**
- * fib_map_free - free the fib objects
- * @dev: Adapter to free
- *
- * Free the PCI mappings and the memory allocated for FIB blocks
- * on this adapter.
- */
- void fib_map_free(struct aac_dev *dev)
- {
- pci_free_consistent(dev->pdev, sizeof(struct hw_fib) * AAC_NUM_FIB, dev->hw_fib_va, dev->hw_fib_pa);
- }
- /**
- * fib_setup - setup the fibs
- * @dev: Adapter to set up
- *
- * Allocate the PCI space for the fibs, map it and then intialise the
- * fib area, the unmapped fib data and also the free list
- */
- int fib_setup(struct aac_dev * dev)
- {
- struct fib *fibptr;
- struct hw_fib *fib;
- dma_addr_t fibpa;
- int i;
-
- if(fib_map_alloc(dev)<0)
- return -ENOMEM;
-
- fib = dev->hw_fib_va;
- fibpa = dev->hw_fib_pa;
- memset(fib, 0, sizeof(struct hw_fib) * AAC_NUM_FIB);
- /*
- * Initialise the fibs
- */
- for (i = 0, fibptr = &dev->fibs[i]; i < AAC_NUM_FIB; i++, fibptr++)
- {
- fibptr->dev = dev;
- fibptr->fib = fib;
- fibptr->data = (void *) fibptr->fib->data;
- fibptr->next = fibptr+1; /* Forward chain the fibs */
- init_MUTEX_LOCKED(&fibptr->event_wait);
- spin_lock_init(&fibptr->event_lock);
- fib->header.XferState = cpu_to_le32(0xffffffff);
- fib->header.SenderSize = cpu_to_le16(sizeof(struct hw_fib));
- fibptr->logicaladdr = (unsigned long) fibpa;
- fib = (struct hw_fib *)((unsigned char *)fib + sizeof(struct hw_fib));
- fibpa = fibpa + sizeof(struct hw_fib);
- }
- /*
- * Add the fib chain to the free list
- */
- dev->fibs[AAC_NUM_FIB-1].next = NULL;
- /*
- * Enable this to debug out of queue space
- */
- dev->free_fib = &dev->fibs[0];
- return 0;
- }
- /**
- * fib_alloc - allocate a fib
- * @dev: Adapter to allocate the fib for
- *
- * Allocate a fib from the adapter fib pool. If the pool is empty we
- * wait for fibs to become free.
- */
-
- struct fib * fib_alloc(struct aac_dev *dev)
- {
- struct fib * fibptr;
- unsigned long flags;
-
- spin_lock_irqsave(&dev->fib_lock, flags);
- fibptr = dev->free_fib;
- if(!fibptr)
- BUG();
- dev->free_fib = fibptr->next;
- spin_unlock_irqrestore(&dev->fib_lock, flags);
- /*
- * Set the proper node type code and node byte size
- */
- fibptr->type = FSAFS_NTC_FIB_CONTEXT;
- fibptr->size = sizeof(struct fib);
- /*
- * Null out fields that depend on being zero at the start of
- * each I/O
- */
- fibptr->fib->header.XferState = cpu_to_le32(0);
- fibptr->callback = NULL;
- fibptr->callback_data = NULL;
- return fibptr;
- }
- /**
- * fib_free - free a fib
- * @fibptr: fib to free up
- *
- * Frees up a fib and places it on the appropriate queue
- * (either free or timed out)
- */
-
- void fib_free(struct fib * fibptr)
- {
- unsigned long flags;
- spin_lock_irqsave(&fibptr->dev->fib_lock, flags);
- if (fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT) {
- aac_config.fib_timeouts++;
- fibptr->next = fibptr->dev->timeout_fib;
- fibptr->dev->timeout_fib = fibptr;
- } else {
- if (fibptr->fib->header.XferState != 0) {
- printk(KERN_WARNING "fib_free, XferState != 0, fibptr = 0x%p, XferState = 0x%xn",
- fibptr, fibptr->fib->header.XferState);
- }
- fibptr->next = fibptr->dev->free_fib;
- fibptr->dev->free_fib = fibptr;
- }
- spin_unlock_irqrestore(&fibptr->dev->fib_lock, flags);
- }
- /**
- * fib_init - initialise a fib
- * @fibptr: The fib to initialize
- *
- * Set up the generic fib fields ready for use
- */
-
- void fib_init(struct fib *fibptr)
- {
- struct hw_fib *fib = fibptr->fib;
- fib->header.StructType = FIB_MAGIC;
- fib->header.Size = cpu_to_le16(sizeof(struct hw_fib));
- fib->header.XferState = cpu_to_le32(HostOwned | FibInitialized | FibEmpty | FastResponseCapable);
- fib->header.SenderFibAddress = cpu_to_le32(0);
- fib->header.ReceiverFibAddress = cpu_to_le32(0);
- fib->header.SenderSize = cpu_to_le16(sizeof(struct hw_fib));
- }
- /**
- * fib_deallocate - deallocate a fib
- * @fibptr: fib to deallocate
- *
- * Will deallocate and return to the free pool the FIB pointed to by the
- * caller.
- */
-
- void fib_dealloc(struct fib * fibptr)
- {
- struct hw_fib *fib = fibptr->fib;
- if(fib->header.StructType != FIB_MAGIC)
- BUG();
- fib->header.XferState = cpu_to_le32(0);
- }
- /*
- * Commuication primitives define and support the queuing method we use to
- * support host to adapter commuication. All queue accesses happen through
- * these routines and are the only routines which have a knowledge of the
- * how these queues are implemented.
- */
-
- /**
- * aac_get_entry - get a queue entry
- * @dev: Adapter
- * @qid: Queue Number
- * @entry: Entry return
- * @index: Index return
- * @nonotify: notification control
- *
- * With a priority the routine returns a queue entry if the queue has free entries. If the queue
- * is full(no free entries) than no entry is returned and the function returns 0 otherwise 1 is
- * returned.
- */
-
- static int aac_get_entry (struct aac_dev * dev, u32 qid, struct aac_entry **entry, u32 * index, unsigned long *nonotify)
- {
- struct aac_queue * q;
- /*
- * All of the queues wrap when they reach the end, so we check
- * to see if they have reached the end and if they have we just
- * set the index back to zero. This is a wrap. You could or off
- * the high bits in all updates but this is a bit faster I think.
- */
- q = &dev->queues->queue[qid];
-
- *index = le32_to_cpu(*(q->headers.producer));
- if (*index - 2 == le32_to_cpu(*(q->headers.consumer)))
- *nonotify = 1;
- if (qid == AdapHighCmdQueue) {
- if (*index >= ADAP_HIGH_CMD_ENTRIES)
- *index = 0;
- } else if (qid == AdapNormCmdQueue) {
- if (*index >= ADAP_NORM_CMD_ENTRIES)
- *index = 0; /* Wrap to front of the Producer Queue. */
- }
- else if (qid == AdapHighRespQueue)
- {
- if (*index >= ADAP_HIGH_RESP_ENTRIES)
- *index = 0;
- }
- else if (qid == AdapNormRespQueue)
- {
- if (*index >= ADAP_NORM_RESP_ENTRIES)
- *index = 0; /* Wrap to front of the Producer Queue. */
- }
- else BUG();
- if (*index + 1 == le32_to_cpu(*(q->headers.consumer))) { /* Queue is full */
- printk(KERN_WARNING "Queue %d full, %ld outstanding.n",
- qid, q->numpending);
- return 0;
- } else {
- *entry = q->base + *index;
- return 1;
- }
- }
- /**
- * aac_queue_get - get the next free QE
- * @dev: Adapter
- * @index: Returned index
- * @priority: Priority of fib
- * @fib: Fib to associate with the queue entry
- * @wait: Wait if queue full
- * @fibptr: Driver fib object to go with fib
- * @nonotify: Don't notify the adapter
- *
- * Gets the next free QE off the requested priorty adapter command
- * queue and associates the Fib with the QE. The QE represented by
- * index is ready to insert on the queue when this routine returns
- * success.
- */
- static int aac_queue_get(struct aac_dev * dev, u32 * index, u32 qid, struct hw_fib * fib, int wait, struct fib * fibptr, unsigned long *nonotify)
- {
- struct aac_entry * entry = NULL;
- int map = 0;
- struct aac_queue * q = &dev->queues->queue[qid];
-
- spin_lock_irqsave(q->lock, q->SavedIrql);
-
- if (qid == AdapHighCmdQueue || qid == AdapNormCmdQueue)
- {
- /* if no entries wait for some if caller wants to */
- while (!aac_get_entry(dev, qid, &entry, index, nonotify))
- {
- printk(KERN_ERR "GetEntries failedn");
- }
- /*
- * Setup queue entry with a command, status and fib mapped
- */
- entry->size = cpu_to_le32(le16_to_cpu(fib->header.Size));
- map = 1;
- }
- else if (qid == AdapHighRespQueue || qid == AdapNormRespQueue)
- {
- while(!aac_get_entry(dev, qid, &entry, index, nonotify))
- {
- /* if no entries wait for some if caller wants to */
- }
- /*
- * Setup queue entry with command, status and fib mapped
- */
- entry->size = cpu_to_le32(le16_to_cpu(fib->header.Size));
- entry->addr = cpu_to_le32(fib->header.SenderFibAddress); /* Restore adapters pointer to the FIB */
- fib->header.ReceiverFibAddress = fib->header.SenderFibAddress; /* Let the adapter now where to find its data */
- map = 0;
- }
- /*
- * If MapFib is true than we need to map the Fib and put pointers
- * in the queue entry.
- */
- if (map)
- entry->addr = cpu_to_le32((unsigned long)(fibptr->logicaladdr));
- return 0;
- }
- /**
- * aac_insert_entry - insert a queue entry
- * @dev: Adapter
- * @index: Index of entry to insert
- * @qid: Queue number
- * @nonotify: Suppress adapter notification
- *
- * Gets the next free QE off the requested priorty adapter command
- * queue and associates the Fib with the QE. The QE represented by
- * index is ready to insert on the queue when this routine returns
- * success.
- */
-
- static int aac_insert_entry(struct aac_dev * dev, u32 index, u32 qid, unsigned long nonotify)
- {
- struct aac_queue * q = &dev->queues->queue[qid];
- if(q == NULL)
- BUG();
- *(q->headers.producer) = cpu_to_le32(index + 1);
- spin_unlock_irqrestore(q->lock, q->SavedIrql);
- if (qid == AdapHighCmdQueue ||
- qid == AdapNormCmdQueue ||
- qid == AdapHighRespQueue ||
- qid == AdapNormRespQueue)
- {
- if (!nonotify)
- aac_adapter_notify(dev, qid);
- }
- else
- printk("Suprise insert!n");
- return 0;
- }
- /*
- * Define the highest level of host to adapter communication routines.
- * These routines will support host to adapter FS commuication. These
- * routines have no knowledge of the commuication method used. This level
- * sends and receives FIBs. This level has no knowledge of how these FIBs
- * get passed back and forth.
- */
- /**
- * fib_send - send a fib to the adapter
- * @command: Command to send
- * @fibptr: The fib
- * @size: Size of fib data area
- * @priority: Priority of Fib
- * @wait: Async/sync select
- * @reply: True if a reply is wanted
- * @callback: Called with reply
- * @callback_data: Passed to callback
- *
- * Sends the requested FIB to the adapter and optionally will wait for a
- * response FIB. If the caller does not wish to wait for a response than
- * an event to wait on must be supplied. This event will be set when a
- * response FIB is received from the adapter.
- */
-
- int fib_send(u16 command, struct fib * fibptr, unsigned long size, int priority, int wait, int reply, fib_callback callback, void * callback_data)
- {
- u32 index;
- u32 qid;
- struct aac_dev * dev = fibptr->dev;
- unsigned long nointr = 0;
- struct hw_fib * fib = fibptr->fib;
- struct aac_queue * q;
- unsigned long flags = 0;
- if (!(le32_to_cpu(fib->header.XferState) & HostOwned))
- return -EBUSY;
- /*
- * There are 5 cases with the wait and reponse requested flags.
- * The only invalid cases are if the caller requests to wait and
- * does not request a response and if the caller does not want a
- * response and the Fibis not allocated from pool. If a response
- * is not requesed the Fib will just be deallocaed by the DPC
- * routine when the response comes back from the adapter. No
- * further processing will be done besides deleting the Fib. We
- * will have a debug mode where the adapter can notify the host
- * it had a problem and the host can log that fact.
- */
- if (wait && !reply) {
- return -EINVAL;
- } else if (!wait && reply) {
- fib->header.XferState |= cpu_to_le32(Async | ResponseExpected);
- FIB_COUNTER_INCREMENT(aac_config.AsyncSent);
- } else if (!wait && !reply) {
- fib->header.XferState |= cpu_to_le32(NoResponseExpected);
- FIB_COUNTER_INCREMENT(aac_config.NoResponseSent);
- } else if (wait && reply) {
- fib->header.XferState |= cpu_to_le32(ResponseExpected);
- FIB_COUNTER_INCREMENT(aac_config.NormalSent);
- }
- fib->header.SenderData = (unsigned long)fibptr; /* for callback */
- /*
- * Set FIB state to indicate where it came from and if we want a
- * response from the adapter. Also load the command from the
- * caller.
- */
- fib->header.SenderFibAddress = cpu_to_le32((u32)fib);
- fib->header.Command = cpu_to_le16(command);
- fib->header.XferState |= cpu_to_le32(SentFromHost);
- fibptr->fib->header.Flags = 0; /* Zero the flags field - its internal only... */
- /*
- * Set the size of the Fib we want to send to the adapter
- */
- fib->header.Size = cpu_to_le16(sizeof(struct aac_fibhdr) + size);
- if (le16_to_cpu(fib->header.Size) > le16_to_cpu(fib->header.SenderSize)) {
- return -EMSGSIZE;
- }
- /*
- * Get a queue entry connect the FIB to it and send an notify
- * the adapter a command is ready.
- */
- if (priority == FsaHigh) {
- fib->header.XferState |= cpu_to_le32(HighPriority);
- qid = AdapHighCmdQueue;
- } else {
- fib->header.XferState |= cpu_to_le32(NormalPriority);
- qid = AdapNormCmdQueue;
- }
- q = &dev->queues->queue[qid];
- if(wait)
- spin_lock_irqsave(&fibptr->event_lock, flags);
- if(aac_queue_get( dev, &index, qid, fib, 1, fibptr, &nointr)<0)
- return -EWOULDBLOCK;
- dprintk((KERN_DEBUG "fib_send: inserting a queue entry at index %d.n",index));
- dprintk((KERN_DEBUG "Fib contents:.n"));
- dprintk((KERN_DEBUG " Command = %d.n", fib->header.Command));
- dprintk((KERN_DEBUG " XferState = %x.n", fib->header.XferState));
- /*
- * Fill in the Callback and CallbackContext if we are not
- * going to wait.
- */
- if (!wait) {
- fibptr->callback = callback;
- fibptr->callback_data = callback_data;
- }
- FIB_COUNTER_INCREMENT(aac_config.FibsSent);
- list_add_tail(&fibptr->queue, &q->pendingq);
- q->numpending++;
- fibptr->done = 0;
- if(aac_insert_entry(dev, index, qid, (nointr & aac_config.irq_mod)) < 0)
- return -EWOULDBLOCK;
- /*
- * If the caller wanted us to wait for response wait now.
- */
-
- if (wait) {
- spin_unlock_irqrestore(&fibptr->event_lock, flags);
- down(&fibptr->event_wait);
- if(fibptr->done == 0)
- BUG();
-
- if((fibptr->flags & FIB_CONTEXT_FLAG_TIMED_OUT))
- return -ETIMEDOUT;
- else
- return 0;
- }
- /*
- * If the user does not want a response than return success otherwise
- * return pending
- */
- if (reply)
- return -EINPROGRESS;
- else
- return 0;
- }
- /**
- * aac_consumer_get - get the top of the queue
- * @dev: Adapter
- * @q: Queue
- * @entry: Return entry
- *
- * Will return a pointer to the entry on the top of the queue requested that
- * we are a consumer of, and return the address of the queue entry. It does
- * not change the state of the queue.
- */
- int aac_consumer_get(struct aac_dev * dev, struct aac_queue * q, struct aac_entry **entry)
- {
- u32 index;
- int status;
- if (*q->headers.producer == *q->headers.consumer) {
- status = 0;
- } else {
- /*
- * The consumer index must be wrapped if we have reached
- * the end of the queue, else we just use the entry
- * pointed to by the header index
- */
- if (le32_to_cpu(*q->headers.consumer) >= q->entries)
- index = 0;
- else
- index = le32_to_cpu(*q->headers.consumer);
- *entry = q->base + index;
- status = 1;
- }
- return(status);
- }
- int aac_consumer_avail(struct aac_dev *dev, struct aac_queue * q)
- {
- return (*q->headers.producer != *q->headers.consumer);
- }
- /**
- * aac_consumer_free - free consumer entry
- * @dev: Adapter
- * @q: Queue
- * @qid: Queue ident
- *
- * Frees up the current top of the queue we are a consumer of. If the
- * queue was full notify the producer that the queue is no longer full.
- */
- void aac_consumer_free(struct aac_dev * dev, struct aac_queue *q, u32 qid)
- {
- int wasfull = 0;
- u32 notify;
- if (*q->headers.producer+1 == *q->headers.consumer)
- wasfull = 1;
-
- if (le32_to_cpu(*q->headers.consumer) >= q->entries)
- *q->headers.consumer = cpu_to_le32(1);
- else
- *q->headers.consumer = cpu_to_le32(le32_to_cpu(*q->headers.consumer)+1);
-
- if (wasfull) {
- switch (qid) {
- case HostNormCmdQueue:
- notify = HostNormCmdNotFull;
- break;
- case HostHighCmdQueue:
- notify = HostHighCmdNotFull;
- break;
- case HostNormRespQueue:
- notify = HostNormRespNotFull;
- break;
- case HostHighRespQueue:
- notify = HostHighRespNotFull;
- break;
- default:
- BUG();
- return;
- }
- aac_adapter_notify(dev, notify);
- }
- }
- /**
- * fib_adapter_complete - complete adapter issued fib
- * @fibptr: fib to complete
- * @size: size of fib
- *
- * Will do all necessary work to complete a FIB that was sent from
- * the adapter.
- */
- int fib_adapter_complete(struct fib * fibptr, unsigned short size)
- {
- struct hw_fib * fib = fibptr->fib;
- struct aac_dev * dev = fibptr->dev;
- unsigned long nointr = 0;
- if (le32_to_cpu(fib->header.XferState) == 0)
- return 0;
- /*
- * If we plan to do anything check the structure type first.
- */
- if ( fib->header.StructType != FIB_MAGIC ) {
- return -EINVAL;
- }
- /*
- * This block handles the case where the adapter had sent us a
- * command and we have finished processing the command. We
- * call completeFib when we are done processing the command
- * and want to send a response back to the adapter. This will
- * send the completed cdb to the adapter.
- */
- if (fib->header.XferState & cpu_to_le32(SentFromAdapter)) {
- fib->header.XferState |= cpu_to_le32(HostProcessed);
- if (fib->header.XferState & cpu_to_le32(HighPriority)) {
- u32 index;
- if (size)
- {
- size += sizeof(struct aac_fibhdr);
- if (size > le16_to_cpu(fib->header.SenderSize))
- return -EMSGSIZE;
- fib->header.Size = cpu_to_le16(size);
- }
- if(aac_queue_get(dev, &index, AdapHighRespQueue, fib, 1, NULL, &nointr) < 0) {
- return -EWOULDBLOCK;
- }
- if (aac_insert_entry(dev, index, AdapHighRespQueue, (nointr & (int)aac_config.irq_mod)) != 0) {
- }
- }
- else if (fib->header.XferState & NormalPriority)
- {
- u32 index;
- if (size) {
- size += sizeof(struct aac_fibhdr);
- if (size > le16_to_cpu(fib->header.SenderSize))
- return -EMSGSIZE;
- fib->header.Size = cpu_to_le16(size);
- }
- if (aac_queue_get(dev, &index, AdapNormRespQueue, fib, 1, NULL, &nointr) < 0)
- return -EWOULDBLOCK;
- if (aac_insert_entry(dev, index, AdapNormRespQueue,
- (nointr & (int)aac_config.irq_mod)) != 0)
- {
- }
- }
- }
- else
- {
- printk(KERN_WARNING "fib_complete: Unknown xferstate detected.n");
- BUG();
- }
- return 0;
- }
- /**
- * fib_complete - fib completion handler
- * @fib: FIB to complete
- *
- * Will do all necessary work to complete a FIB.
- */
-
- int fib_complete(struct fib * fibptr)
- {
- struct hw_fib * fib = fibptr->fib;
- /*
- * Check for a fib which has already been completed
- */
- if (fib->header.XferState == cpu_to_le32(0))
- return 0;
- /*
- * If we plan to do anything check the structure type first.
- */
- if (fib->header.StructType != FIB_MAGIC)
- return -EINVAL;
- /*
- * This block completes a cdb which orginated on the host and we
- * just need to deallocate the cdb or reinit it. At this point the
- * command is complete that we had sent to the adapter and this
- * cdb could be reused.
- */
- if((fib->header.XferState & cpu_to_le32(SentFromHost)) &&
- (fib->header.XferState & cpu_to_le32(AdapterProcessed)))
- {
- fib_dealloc(fibptr);
- }
- else if(fib->header.XferState & cpu_to_le32(SentFromHost))
- {
- /*
- * This handles the case when the host has aborted the I/O
- * to the adapter because the adapter is not responding
- */
- fib_dealloc(fibptr);
- } else if(fib->header.XferState & cpu_to_le32(HostOwned)) {
- fib_dealloc(fibptr);
- } else {
- BUG();
- }
- return 0;
- }
- /**
- * aac_printf - handle printf from firmware
- * @dev: Adapter
- * @val: Message info
- *
- * Print a message passed to us by the controller firmware on the
- * Adaptec board
- */
- void aac_printf(struct aac_dev *dev, u32 val)
- {
- int length = val & 0xffff;
- int level = (val >> 16) & 0xffff;
- char *cp = dev->printfbuf;
-
- /*
- * The size of the printfbuf is set in port.c
- * There is no variable or define for it
- */
- if (length > 255)
- length = 255;
- if (cp[length] != 0)
- cp[length] = 0;
- if (level == LOG_HIGH_ERROR)
- printk(KERN_WARNING "aacraid:%s.n", cp);
- else
- printk(KERN_INFO "aacraid:%s.n", cp);
- memset(cp, 0, 256);
- }
- /**
- * aac_handle_aif - Handle a message from the firmware
- * @dev: Which adapter this fib is from
- * @fibptr: Pointer to fibptr from adapter
- *
- * This routine handles a driver notify fib from the adapter and
- * dispatches it to the appropriate routine for handling.
- */
- static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
- {
- struct hw_fib * fib = fibptr->fib;
- /*
- * Set the status of this FIB to be Invalid parameter.
- *
- * *(u32 *)fib->data = ST_INVAL;
- */
- *(u32 *)fib->data = cpu_to_le32(ST_OK);
- fib_adapter_complete(fibptr, sizeof(u32));
- }
- /**
- * aac_command_thread - command processing thread
- * @dev: Adapter to monitor
- *
- * Waits on the commandready event in it's queue. When the event gets set
- * it will pull FIBs off it's queue. It will continue to pull FIBs off
- * until the queue is empty. When the queue is empty it will wait for
- * more FIBs.
- */
-
- int aac_command_thread(struct aac_dev * dev)
- {
- struct hw_fib *fib, *newfib;
- struct fib fibptr; /* for error logging */
- struct aac_queue_block *queues = dev->queues;
- struct aac_fib_context *fibctx;
- unsigned long flags;
- DECLARE_WAITQUEUE(wait, current);
- /*
- * We can only have one thread per adapter for AIF's.
- */
- if (dev->aif_thread)
- return -EINVAL;
- /*
- * Set up the name that will appear in 'ps'
- * stored in task_struct.comm[16].
- */
- sprintf(current->comm, "aacraid");
- daemonize();
- /*
- * Let the DPC know it has a place to send the AIF's to.
- */
- dev->aif_thread = 1;
- memset(&fibptr, 0, sizeof(struct fib));
- add_wait_queue(&queues->queue[HostNormCmdQueue].cmdready, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
- while(1)
- {
- spin_lock_irqsave(queues->queue[HostNormCmdQueue].lock, flags);
- while(!list_empty(&(queues->queue[HostNormCmdQueue].cmdq))) {
- struct list_head *entry;
- struct aac_aifcmd * aifcmd;
- set_current_state(TASK_RUNNING);
-
- entry = queues->queue[HostNormCmdQueue].cmdq.next;
- list_del(entry);
-
- spin_unlock_irqrestore(queues->queue[HostNormCmdQueue].lock, flags);
- fib = list_entry(entry, struct hw_fib, header.FibLinks);
- /*
- * We will process the FIB here or pass it to a
- * worker thread that is TBD. We Really can't
- * do anything at this point since we don't have
- * anything defined for this thread to do.
- */
- memset(&fibptr, 0, sizeof(struct fib));
- fibptr.type = FSAFS_NTC_FIB_CONTEXT;
- fibptr.size = sizeof( struct fib );
- fibptr.fib = fib;
- fibptr.data = fib->data;
- fibptr.dev = dev;
- /*
- * We only handle AifRequest fibs from the adapter.
- */
- aifcmd = (struct aac_aifcmd *) fib->data;
- if (aifcmd->command == le16_to_cpu(AifCmdDriverNotify)) {
- aac_handle_aif(dev, &fibptr);
- } else {
- /* The u32 here is important and intended. We are using
- 32bit wrapping time to fit the adapter field */
-
- u32 time_now, time_last;
- unsigned long flagv;
-
- time_now = jiffies/HZ;
- spin_lock_irqsave(&dev->fib_lock, flagv);
- entry = dev->fib_list.next;
- /*
- * For each Context that is on the
- * fibctxList, make a copy of the
- * fib, and then set the event to wake up the
- * thread that is waiting for it.
- */
- while (entry != &dev->fib_list) {
- /*
- * Extract the fibctx
- */
- fibctx = list_entry(entry, struct aac_fib_context, next);
- /*
- * Check if the queue is getting
- * backlogged
- */
- if (fibctx->count > 20)
- {
- time_last = fibctx->jiffies;
- /*
- * Has it been > 2 minutes
- * since the last read off
- * the queue?
- */
- if ((time_now - time_last) > 120) {
- entry = entry->next;
- aac_close_fib_context(dev, fibctx);
- continue;
- }
- }
- /*
- * Warning: no sleep allowed while
- * holding spinlock
- */
- newfib = kmalloc(sizeof(struct hw_fib), GFP_ATOMIC);
- if (newfib) {
- /*
- * Make the copy of the FIB
- */
- memcpy(newfib, fib, sizeof(struct hw_fib));
- /*
- * Put the FIB onto the
- * fibctx's fibs
- */
- list_add_tail(&newfib->header.FibLinks, &fibctx->fibs);
- fibctx->count++;
- /*
- * Set the event to wake up the
- * thread that will waiting.
- */
- up(&fibctx->wait_sem);
- } else {
- printk(KERN_WARNING "aifd: didn't allocate NewFib.n");
- }
- entry = entry->next;
- }
- /*
- * Set the status of this FIB
- */
- *(u32 *)fib->data = cpu_to_le32(ST_OK);
- fib_adapter_complete(&fibptr, sizeof(u32));
- spin_unlock_irqrestore(&dev->fib_lock, flagv);
- }
- spin_lock_irqsave(queues->queue[HostNormCmdQueue].lock, flags);
- }
- /*
- * There are no more AIF's
- */
- spin_unlock_irqrestore(queues->queue[HostNormCmdQueue].lock, flags);
- schedule();
- if(signal_pending(current))
- break;
- set_current_state(TASK_INTERRUPTIBLE);
- }
- remove_wait_queue(&queues->queue[HostNormCmdQueue].cmdready, &wait);
- dev->aif_thread = 0;
- complete_and_exit(&dev->aif_completion, 0);
- }