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path: root/drivers/block/cciss.c
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Diffstat (limited to 'drivers/block/cciss.c')
-rw-r--r--drivers/block/cciss.c188
1 files changed, 162 insertions, 26 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index a97c80b5773..e239a6c2923 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -148,6 +148,7 @@ static struct board_type products[] = {
static ctlr_info_t *hba[MAX_CTLR];
static void do_cciss_request(request_queue_t *q);
+static irqreturn_t do_cciss_intr(int irq, void *dev_id, struct pt_regs *regs);
static int cciss_open(struct inode *inode, struct file *filep);
static int cciss_release(struct inode *inode, struct file *filep);
static int cciss_ioctl(struct inode *inode, struct file *filep,
@@ -1583,6 +1584,24 @@ static int fill_cmd(CommandList_struct *c, __u8 cmd, int ctlr, void *buff,
}
} else if (cmd_type == TYPE_MSG) {
switch (cmd) {
+ case 0: /* ABORT message */
+ c->Request.CDBLen = 12;
+ c->Request.Type.Attribute = ATTR_SIMPLE;
+ c->Request.Type.Direction = XFER_WRITE;
+ c->Request.Timeout = 0;
+ c->Request.CDB[0] = cmd; /* abort */
+ c->Request.CDB[1] = 0; /* abort a command */
+ /* buff contains the tag of the command to abort */
+ memcpy(&c->Request.CDB[4], buff, 8);
+ break;
+ case 1: /* RESET message */
+ c->Request.CDBLen = 12;
+ c->Request.Type.Attribute = ATTR_SIMPLE;
+ c->Request.Type.Direction = XFER_WRITE;
+ c->Request.Timeout = 0;
+ memset(&c->Request.CDB[0], 0, sizeof(c->Request.CDB));
+ c->Request.CDB[0] = cmd; /* reset */
+ c->Request.CDB[1] = 0x04; /* reset a LUN */
case 3: /* No-Op message */
c->Request.CDBLen = 1;
c->Request.Type.Attribute = ATTR_SIMPLE;
@@ -1869,6 +1888,52 @@ static unsigned long pollcomplete(int ctlr)
/* Invalid address to tell caller we ran out of time */
return 1;
}
+
+static int add_sendcmd_reject(__u8 cmd, int ctlr, unsigned long complete)
+{
+ /* We get in here if sendcmd() is polling for completions
+ and gets some command back that it wasn't expecting --
+ something other than that which it just sent down.
+ Ordinarily, that shouldn't happen, but it can happen when
+ the scsi tape stuff gets into error handling mode, and
+ starts using sendcmd() to try to abort commands and
+ reset tape drives. In that case, sendcmd may pick up
+ completions of commands that were sent to logical drives
+ through the block i/o system, or cciss ioctls completing, etc.
+ In that case, we need to save those completions for later
+ processing by the interrupt handler.
+ */
+
+#ifdef CONFIG_CISS_SCSI_TAPE
+ struct sendcmd_reject_list *srl = &hba[ctlr]->scsi_rejects;
+
+ /* If it's not the scsi tape stuff doing error handling, (abort */
+ /* or reset) then we don't expect anything weird. */
+ if (cmd != CCISS_RESET_MSG && cmd != CCISS_ABORT_MSG) {
+#endif
+ printk( KERN_WARNING "cciss cciss%d: SendCmd "
+ "Invalid command list address returned! (%lx)\n",
+ ctlr, complete);
+ /* not much we can do. */
+#ifdef CONFIG_CISS_SCSI_TAPE
+ return 1;
+ }
+
+ /* We've sent down an abort or reset, but something else
+ has completed */
+ if (srl->ncompletions >= (NR_CMDS + 2)) {
+ /* Uh oh. No room to save it for later... */
+ printk(KERN_WARNING "cciss%d: Sendcmd: Invalid command addr, "
+ "reject list overflow, command lost!\n", ctlr);
+ return 1;
+ }
+ /* Save it for later */
+ srl->complete[srl->ncompletions] = complete;
+ srl->ncompletions++;
+#endif
+ return 0;
+}
+
/*
* Send a command to the controller, and wait for it to complete.
* Only used at init time.
@@ -1891,7 +1956,7 @@ static int sendcmd(
unsigned long complete;
ctlr_info_t *info_p= hba[ctlr];
u64bit buff_dma_handle;
- int status;
+ int status, done = 0;
if ((c = cmd_alloc(info_p, 1)) == NULL) {
printk(KERN_WARNING "cciss: unable to get memory");
@@ -1913,7 +1978,9 @@ resend_cmd1:
info_p->access.set_intr_mask(info_p, CCISS_INTR_OFF);
/* Make sure there is room in the command FIFO */
- /* Actually it should be completely empty at this time. */
+ /* Actually it should be completely empty at this time */
+ /* unless we are in here doing error handling for the scsi */
+ /* tape side of the driver. */
for (i = 200000; i > 0; i--)
{
/* if fifo isn't full go */
@@ -1930,13 +1997,25 @@ resend_cmd1:
* Send the cmd
*/
info_p->access.submit_command(info_p, c);
- complete = pollcomplete(ctlr);
+ done = 0;
+ do {
+ complete = pollcomplete(ctlr);
#ifdef CCISS_DEBUG
- printk(KERN_DEBUG "cciss: command completed\n");
+ printk(KERN_DEBUG "cciss: command completed\n");
#endif /* CCISS_DEBUG */
- if (complete != 1) {
+ if (complete == 1) {
+ printk( KERN_WARNING
+ "cciss cciss%d: SendCmd Timeout out, "
+ "No command list address returned!\n",
+ ctlr);
+ status = IO_ERROR;
+ done = 1;
+ break;
+ }
+
+ /* This will need to change for direct lookup completions */
if ( (complete & CISS_ERROR_BIT)
&& (complete & ~CISS_ERROR_BIT) == c->busaddr)
{
@@ -1976,6 +2055,10 @@ resend_cmd1:
status = IO_ERROR;
goto cleanup1;
}
+ } else if (c->err_info->CommandStatus == CMD_UNABORTABLE) {
+ printk(KERN_WARNING "cciss%d: command could not be aborted.\n", ctlr);
+ status = IO_ERROR;
+ goto cleanup1;
}
printk(KERN_WARNING "ciss ciss%d: sendcmd"
" Error %x \n", ctlr,
@@ -1990,20 +2073,15 @@ resend_cmd1:
goto cleanup1;
}
}
+ /* This will need changing for direct lookup completions */
if (complete != c->busaddr) {
- printk( KERN_WARNING "cciss cciss%d: SendCmd "
- "Invalid command list address returned! (%lx)\n",
- ctlr, complete);
- status = IO_ERROR;
- goto cleanup1;
- }
- } else {
- printk( KERN_WARNING
- "cciss cciss%d: SendCmd Timeout out, "
- "No command list address returned!\n",
- ctlr);
- status = IO_ERROR;
- }
+ if (add_sendcmd_reject(cmd, ctlr, complete) != 0) {
+ BUG(); /* we are pretty much hosed if we get here. */
+ }
+ continue;
+ } else
+ done = 1;
+ } while (!done);
cleanup1:
/* unlock the data buffer from DMA */
@@ -2011,6 +2089,11 @@ cleanup1:
buff_dma_handle.val32.upper = c->SG[0].Addr.upper;
pci_unmap_single(info_p->pdev, (dma_addr_t) buff_dma_handle.val,
c->SG[0].Len, PCI_DMA_BIDIRECTIONAL);
+#ifdef CONFIG_CISS_SCSI_TAPE
+ /* if we saved some commands for later, process them now. */
+ if (info_p->scsi_rejects.ncompletions > 0)
+ do_cciss_intr(0, info_p, NULL);
+#endif
cmd_free(info_p, c, 1);
return (status);
}
@@ -2335,6 +2418,48 @@ startio:
start_io(h);
}
+static inline unsigned long get_next_completion(ctlr_info_t *h)
+{
+#ifdef CONFIG_CISS_SCSI_TAPE
+ /* Any rejects from sendcmd() lying around? Process them first */
+ if (h->scsi_rejects.ncompletions == 0)
+ return h->access.command_completed(h);
+ else {
+ struct sendcmd_reject_list *srl;
+ int n;
+ srl = &h->scsi_rejects;
+ n = --srl->ncompletions;
+ /* printk("cciss%d: processing saved reject\n", h->ctlr); */
+ printk("p");
+ return srl->complete[n];
+ }
+#else
+ return h->access.command_completed(h);
+#endif
+}
+
+static inline int interrupt_pending(ctlr_info_t *h)
+{
+#ifdef CONFIG_CISS_SCSI_TAPE
+ return ( h->access.intr_pending(h)
+ || (h->scsi_rejects.ncompletions > 0));
+#else
+ return h->access.intr_pending(h);
+#endif
+}
+
+static inline long interrupt_not_for_us(ctlr_info_t *h)
+{
+#ifdef CONFIG_CISS_SCSI_TAPE
+ return (((h->access.intr_pending(h) == 0) ||
+ (h->interrupts_enabled == 0))
+ && (h->scsi_rejects.ncompletions == 0));
+#else
+ return (((h->access.intr_pending(h) == 0) ||
+ (h->interrupts_enabled == 0)));
+#endif
+}
+
static irqreturn_t do_cciss_intr(int irq, void *dev_id, struct pt_regs *regs)
{
ctlr_info_t *h = dev_id;
@@ -2344,19 +2469,15 @@ static irqreturn_t do_cciss_intr(int irq, void *dev_id, struct pt_regs *regs)
int j;
int start_queue = h->next_to_run;
- /* Is this interrupt for us? */
- if (( h->access.intr_pending(h) == 0) || (h->interrupts_enabled == 0))
+ if (interrupt_not_for_us(h))
return IRQ_NONE;
-
/*
* If there are completed commands in the completion queue,
* we had better do something about it.
*/
spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
- while( h->access.intr_pending(h))
- {
- while((a = h->access.command_completed(h)) != FIFO_EMPTY)
- {
+ while (interrupt_pending(h)) {
+ while((a = get_next_completion(h)) != FIFO_EMPTY) {
a1 = a;
if ((a & 0x04)) {
a2 = (a >> 3);
@@ -2963,7 +3084,15 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
printk( KERN_ERR "cciss: out of memory");
goto clean4;
}
-
+#ifdef CONFIG_CISS_SCSI_TAPE
+ hba[i]->scsi_rejects.complete =
+ kmalloc(sizeof(hba[i]->scsi_rejects.complete[0]) *
+ (NR_CMDS + 5), GFP_KERNEL);
+ if (hba[i]->scsi_rejects.complete == NULL) {
+ printk( KERN_ERR "cciss: out of memory");
+ goto clean4;
+ }
+#endif
spin_lock_init(&hba[i]->lock);
/* Initialize the pdev driver private data.
@@ -3031,6 +3160,10 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
return(1);
clean4:
+#ifdef CONFIG_CISS_SCSI_TAPE
+ if(hba[i]->scsi_rejects.complete)
+ kfree(hba[i]->scsi_rejects.complete);
+#endif
kfree(hba[i]->cmd_pool_bits);
if(hba[i]->cmd_pool)
pci_free_consistent(hba[i]->pdev,
@@ -3103,6 +3236,9 @@ static void __devexit cciss_remove_one (struct pci_dev *pdev)
pci_free_consistent(hba[i]->pdev, NR_CMDS * sizeof( ErrorInfo_struct),
hba[i]->errinfo_pool, hba[i]->errinfo_pool_dhandle);
kfree(hba[i]->cmd_pool_bits);
+#ifdef CONFIG_CISS_SCSI_TAPE
+ kfree(hba[i]->scsi_rejects.complete);
+#endif
release_io_mem(hba[i]);
free_hba(i);
}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-25 03:47:21 +0000