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path: root/drivers/block/cciss_scsi.c
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Diffstat (limited to 'drivers/block/cciss_scsi.c')
-rw-r--r--drivers/block/cciss_scsi.c145
1 files changed, 89 insertions, 56 deletions
diff --git a/drivers/block/cciss_scsi.c b/drivers/block/cciss_scsi.c
index 5d0e46dc3632..e1d0e2cfec72 100644
--- a/drivers/block/cciss_scsi.c
+++ b/drivers/block/cciss_scsi.c
@@ -84,7 +84,6 @@ static struct scsi_host_template cciss_driver_template = {
.queuecommand = cciss_scsi_queue_command,
.can_queue = SCSI_CCISS_CAN_QUEUE,
.this_id = 7,
- .sg_tablesize = MAXSGENTRIES,
.cmd_per_lun = 1,
.use_clustering = DISABLE_CLUSTERING,
/* Can't have eh_bus_reset_handler or eh_host_reset_handler for cciss */
@@ -93,11 +92,16 @@ static struct scsi_host_template cciss_driver_template = {
};
#pragma pack(1)
+
+#define SCSI_PAD_32 0
+#define SCSI_PAD_64 0
+
struct cciss_scsi_cmd_stack_elem_t {
CommandList_struct cmd;
ErrorInfo_struct Err;
__u32 busaddr;
- __u32 pad;
+ int cmdindex;
+ u8 pad[IS_32_BIT * SCSI_PAD_32 + IS_64_BIT * SCSI_PAD_64];
};
#pragma pack()
@@ -118,16 +122,15 @@ struct cciss_scsi_cmd_stack_t {
struct cciss_scsi_adapter_data_t {
struct Scsi_Host *scsi_host;
struct cciss_scsi_cmd_stack_t cmd_stack;
+ SGDescriptor_struct **cmd_sg_list;
int registered;
spinlock_t lock; // to protect ccissscsi[ctlr];
};
#define CPQ_TAPE_LOCK(ctlr, flags) spin_lock_irqsave( \
- &(((struct cciss_scsi_adapter_data_t *) \
- hba[ctlr]->scsi_ctlr)->lock), flags);
+ &hba[ctlr]->scsi_ctlr->lock, flags);
#define CPQ_TAPE_UNLOCK(ctlr, flags) spin_unlock_irqrestore( \
- &(((struct cciss_scsi_adapter_data_t *) \
- hba[ctlr]->scsi_ctlr)->lock), flags);
+ &hba[ctlr]->scsi_ctlr->lock, flags);
static CommandList_struct *
scsi_cmd_alloc(ctlr_info_t *h)
@@ -143,7 +146,7 @@ scsi_cmd_alloc(ctlr_info_t *h)
struct cciss_scsi_cmd_stack_t *stk;
u64bit temp64;
- sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr;
+ sa = h->scsi_ctlr;
stk = &sa->cmd_stack;
if (stk->top < 0)
@@ -154,6 +157,7 @@ scsi_cmd_alloc(ctlr_info_t *h)
memset(&c->Err, 0, sizeof(c->Err));
/* set physical addr of cmd and addr of scsi parameters */
c->cmd.busaddr = c->busaddr;
+ c->cmd.cmdindex = c->cmdindex;
/* (__u32) (stk->cmd_pool_handle +
(sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top)); */
@@ -182,7 +186,7 @@ scsi_cmd_free(ctlr_info_t *h, CommandList_struct *cmd)
struct cciss_scsi_adapter_data_t *sa;
struct cciss_scsi_cmd_stack_t *stk;
- sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr;
+ sa = h->scsi_ctlr;
stk = &sa->cmd_stack;
if (stk->top >= CMD_STACK_SIZE) {
printk("cciss: scsi_cmd_free called too many times.\n");
@@ -199,24 +203,31 @@ scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa)
struct cciss_scsi_cmd_stack_t *stk;
size_t size;
+ sa->cmd_sg_list = cciss_allocate_sg_chain_blocks(hba[ctlr],
+ hba[ctlr]->chainsize, CMD_STACK_SIZE);
+ if (!sa->cmd_sg_list && hba[ctlr]->chainsize > 0)
+ return -ENOMEM;
+
stk = &sa->cmd_stack;
size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE;
- // pci_alloc_consistent guarantees 32-bit DMA address will
- // be used
-
+ /* Check alignment, see cciss_cmd.h near CommandList_struct def. */
+ BUILD_BUG_ON((sizeof(*stk->pool) % COMMANDLIST_ALIGNMENT) != 0);
+ /* pci_alloc_consistent guarantees 32-bit DMA address will be used */
stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
pci_alloc_consistent(hba[ctlr]->pdev, size, &stk->cmd_pool_handle);
if (stk->pool == NULL) {
- printk("stk->pool is null\n");
- return -1;
+ cciss_free_sg_chain_blocks(sa->cmd_sg_list, CMD_STACK_SIZE);
+ sa->cmd_sg_list = NULL;
+ return -ENOMEM;
}
for (i=0; i<CMD_STACK_SIZE; i++) {
stk->elem[i] = &stk->pool[i];
stk->elem[i]->busaddr = (__u32) (stk->cmd_pool_handle +
(sizeof(struct cciss_scsi_cmd_stack_elem_t) * i));
+ stk->elem[i]->cmdindex = i;
}
stk->top = CMD_STACK_SIZE-1;
return 0;
@@ -229,7 +240,7 @@ scsi_cmd_stack_free(int ctlr)
struct cciss_scsi_cmd_stack_t *stk;
size_t size;
- sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
+ sa = hba[ctlr]->scsi_ctlr;
stk = &sa->cmd_stack;
if (stk->top != CMD_STACK_SIZE-1) {
printk( "cciss: %d scsi commands are still outstanding.\n",
@@ -241,6 +252,7 @@ scsi_cmd_stack_free(int ctlr)
pci_free_consistent(hba[ctlr]->pdev, size, stk->pool, stk->cmd_pool_handle);
stk->pool = NULL;
+ cciss_free_sg_chain_blocks(sa->cmd_sg_list, CMD_STACK_SIZE);
}
#if 0
@@ -530,8 +542,7 @@ adjust_cciss_scsi_table(int ctlr, int hostno,
CPQ_TAPE_LOCK(ctlr, flags);
if (hostno != -1) /* if it's not the first time... */
- sh = ((struct cciss_scsi_adapter_data_t *)
- hba[ctlr]->scsi_ctlr)->scsi_host;
+ sh = hba[ctlr]->scsi_ctlr->scsi_host;
/* find any devices in ccissscsi[] that are not in
sd[] and remove them from ccissscsi[] */
@@ -702,7 +713,7 @@ cciss_scsi_setup(int cntl_num)
kfree(shba);
shba = NULL;
}
- hba[cntl_num]->scsi_ctlr = (void *) shba;
+ hba[cntl_num]->scsi_ctlr = shba;
return;
}
@@ -725,6 +736,8 @@ complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag)
ctlr = hba[cp->ctlr];
scsi_dma_unmap(cmd);
+ if (cp->Header.SGTotal > ctlr->max_cmd_sgentries)
+ cciss_unmap_sg_chain_block(ctlr, cp);
cmd->result = (DID_OK << 16); /* host byte */
cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */
@@ -847,9 +860,10 @@ cciss_scsi_detect(int ctlr)
sh->io_port = 0; // good enough? FIXME,
sh->n_io_port = 0; // I don't think we use these two...
sh->this_id = SELF_SCSI_ID;
+ sh->sg_tablesize = hba[ctlr]->maxsgentries;
((struct cciss_scsi_adapter_data_t *)
- hba[ctlr]->scsi_ctlr)->scsi_host = (void *) sh;
+ hba[ctlr]->scsi_ctlr)->scsi_host = sh;
sh->hostdata[0] = (unsigned long) hba[ctlr];
sh->irq = hba[ctlr]->intr[SIMPLE_MODE_INT];
sh->unique_id = sh->irq;
@@ -1364,34 +1378,54 @@ cciss_scsi_proc_info(struct Scsi_Host *sh,
dma mapping and fills in the scatter gather entries of the
cciss command, cp. */
-static void
-cciss_scatter_gather(struct pci_dev *pdev,
- CommandList_struct *cp,
- struct scsi_cmnd *cmd)
+static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *cp,
+ struct scsi_cmnd *cmd)
{
unsigned int len;
struct scatterlist *sg;
__u64 addr64;
- int use_sg, i;
-
- BUG_ON(scsi_sg_count(cmd) > MAXSGENTRIES);
-
- use_sg = scsi_dma_map(cmd);
- if (use_sg) { /* not too many addrs? */
- scsi_for_each_sg(cmd, sg, use_sg, i) {
+ int request_nsgs, i, chained, sg_index;
+ struct cciss_scsi_adapter_data_t *sa = h->scsi_ctlr;
+ SGDescriptor_struct *curr_sg;
+
+ BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);
+
+ chained = 0;
+ sg_index = 0;
+ curr_sg = cp->SG;
+ request_nsgs = scsi_dma_map(cmd);
+ if (request_nsgs) {
+ scsi_for_each_sg(cmd, sg, request_nsgs, i) {
+ if (sg_index + 1 == h->max_cmd_sgentries &&
+ !chained && request_nsgs - i > 1) {
+ chained = 1;
+ sg_index = 0;
+ curr_sg = sa->cmd_sg_list[cp->cmdindex];
+ }
addr64 = (__u64) sg_dma_address(sg);
len = sg_dma_len(sg);
- cp->SG[i].Addr.lower =
- (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
- cp->SG[i].Addr.upper =
- (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
- cp->SG[i].Len = len;
- cp->SG[i].Ext = 0; // we are not chaining
+ curr_sg[sg_index].Addr.lower =
+ (__u32) (addr64 & 0x0FFFFFFFFULL);
+ curr_sg[sg_index].Addr.upper =
+ (__u32) ((addr64 >> 32) & 0x0FFFFFFFFULL);
+ curr_sg[sg_index].Len = len;
+ curr_sg[sg_index].Ext = 0;
+ ++sg_index;
}
+ if (chained)
+ cciss_map_sg_chain_block(h, cp,
+ sa->cmd_sg_list[cp->cmdindex],
+ (request_nsgs - (h->max_cmd_sgentries - 1)) *
+ sizeof(SGDescriptor_struct));
}
-
- cp->Header.SGList = (__u8) use_sg; /* no. SGs contig in this cmd */
- cp->Header.SGTotal = (__u16) use_sg; /* total sgs in this cmd list */
+ /* track how many SG entries we are using */
+ if (request_nsgs > h->maxSG)
+ h->maxSG = request_nsgs;
+ cp->Header.SGTotal = (__u8) request_nsgs + chained;
+ if (request_nsgs > h->max_cmd_sgentries)
+ cp->Header.SGList = h->max_cmd_sgentries;
+ else
+ cp->Header.SGList = cp->Header.SGTotal;
return;
}
@@ -1399,7 +1433,7 @@ cciss_scatter_gather(struct pci_dev *pdev,
static int
cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
{
- ctlr_info_t **c;
+ ctlr_info_t *c;
int ctlr, rc;
unsigned char scsi3addr[8];
CommandList_struct *cp;
@@ -1407,8 +1441,8 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
// Get the ptr to our adapter structure (hba[i]) out of cmd->host.
// We violate cmd->host privacy here. (Is there another way?)
- c = (ctlr_info_t **) &cmd->device->host->hostdata[0];
- ctlr = (*c)->ctlr;
+ c = (ctlr_info_t *) cmd->device->host->hostdata[0];
+ ctlr = c->ctlr;
rc = lookup_scsi3addr(ctlr, cmd->device->channel, cmd->device->id,
cmd->device->lun, scsi3addr);
@@ -1431,7 +1465,7 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
see what the device thinks of it. */
spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
- cp = scsi_cmd_alloc(*c);
+ cp = scsi_cmd_alloc(c);
spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
if (cp == NULL) { /* trouble... */
printk("scsi_cmd_alloc returned NULL!\n");
@@ -1489,15 +1523,14 @@ cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd
BUG();
break;
}
-
- cciss_scatter_gather((*c)->pdev, cp, cmd); // Fill the SG list
+ cciss_scatter_gather(c, cp, cmd);
/* Put the request on the tail of the request queue */
spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
- addQ(&(*c)->reqQ, cp);
- (*c)->Qdepth++;
- start_io(*c);
+ addQ(&c->reqQ, cp);
+ c->Qdepth++;
+ start_io(c);
spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
/* the cmd'll come back via intr handler in complete_scsi_command() */
@@ -1514,7 +1547,7 @@ cciss_unregister_scsi(int ctlr)
/* we are being forcibly unloaded, and may not refuse. */
spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
- sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
+ sa = hba[ctlr]->scsi_ctlr;
stk = &sa->cmd_stack;
/* if we weren't ever actually registered, don't unregister */
@@ -1541,7 +1574,7 @@ cciss_engage_scsi(int ctlr)
unsigned long flags;
spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
- sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
+ sa = hba[ctlr]->scsi_ctlr;
stk = &sa->cmd_stack;
if (sa->registered) {
@@ -1654,14 +1687,14 @@ static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
int rc;
CommandList_struct *cmd_in_trouble;
unsigned char lunaddr[8];
- ctlr_info_t **c;
+ ctlr_info_t *c;
int ctlr;
/* find the controller to which the command to be aborted was sent */
- c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];
+ c = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
if (c == NULL) /* paranoia */
return FAILED;
- ctlr = (*c)->ctlr;
+ ctlr = c->ctlr;
printk(KERN_WARNING "cciss%d: resetting tape drive or medium changer.\n", ctlr);
/* find the command that's giving us trouble */
cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
@@ -1671,7 +1704,7 @@ static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
/* send a reset to the SCSI LUN which the command was sent to */
rc = sendcmd_withirq(CCISS_RESET_MSG, ctlr, NULL, 0, 0, lunaddr,
TYPE_MSG);
- if (rc == 0 && wait_for_device_to_become_ready(*c, lunaddr) == 0)
+ if (rc == 0 && wait_for_device_to_become_ready(c, lunaddr) == 0)
return SUCCESS;
printk(KERN_WARNING "cciss%d: resetting device failed.\n", ctlr);
return FAILED;
@@ -1682,14 +1715,14 @@ static int cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
int rc;
CommandList_struct *cmd_to_abort;
unsigned char lunaddr[8];
- ctlr_info_t **c;
+ ctlr_info_t *c;
int ctlr;
/* find the controller to which the command to be aborted was sent */
- c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];
+ c = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
if (c == NULL) /* paranoia */
return FAILED;
- ctlr = (*c)->ctlr;
+ ctlr = c->ctlr;
printk(KERN_WARNING "cciss%d: aborting tardy SCSI cmd\n", ctlr);
/* find the command to be aborted */
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-13 12:18:20 +0000