What about
dd if=/dev/cciss/c0d1p1 of=/dev/null bs=4096k
Should be similar, right? When I had tried that, I still got a max
of 64 SG's coming down. Tried lots of other block sizes too...
Maybe it's something to do with disk performance. A raid 1 volume of two
disks seems to give me 64 SGs, but a raid-0 set (1 disk) gets me
just 32. Maybe adding more disks in a stripe-set would get me more.
I haven't experimented enough to see if that behavior is consistent.
[...]
> Besides, if you put 8kb on the stack you are already seriously in
> trouble.
That is what I thought, but I could't remember where I learned it.
Anyway, here is a new cciss patch to work with your ll_rw_blk.c patch
to use more than 31 scatter gather entries.
-- steve
drivers/block/Config.help | 16 +++
drivers/block/Config.in | 3
drivers/block/cciss.c | 216 +++++++++++++++++++++++++++++++++++----------
drivers/block/cciss.h | 10 ++
drivers/block/cciss_cmd.h | 13 ++
drivers/block/cciss_scsi.c | 26 +++++
6 files changed, 237 insertions, 47 deletions
--- lx2544ac3/drivers/block/cciss.c~sgc3 Mon Oct 28 15:18:44 2002
+++ lx2544ac3-root/drivers/block/cciss.c Mon Oct 28 16:02:07 2002
@@ -37,6 +37,7 @@
#include <linux/init.h>
#include <linux/hdreg.h>
#include <linux/spinlock.h>
+#include <linux/completion.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -164,7 +165,7 @@ static int cciss_proc_get_info(char *buf
" Current Q depth: %d\n"
" Max Q depth since init: %d\n"
" Max # commands on controller since init: %d\n"
- " Max SG entries since init: %d\n\n",
+ " Max SG entries since init: %d/%d\n\n",
h->devname,
h->product_name,
(unsigned long)h->board_id,
@@ -173,7 +174,8 @@ static int cciss_proc_get_info(char *buf
(unsigned int)h->intr,
h->num_luns,
h->highest_lun,
- h->Qdepth, h->maxQsinceinit, h->max_outstanding, h->maxSG);
+ h->Qdepth, h->maxQsinceinit, h->max_outstanding, h->maxSG,
+ h->sg_limit);
pos += size; len += size;
cciss_proc_tape_report(ctlr, buffer, &pos, &len);
@@ -248,6 +250,44 @@ static void __init cciss_procinit(int i)
}
#endif /* CONFIG_PROC_FS */
+static int supports_sg_chaining(ctlr_info_t *h)
+{
+ int fw_ver = (h->firm_ver[0] - '0') * 100 + /* [1] == '.', skip */
+ (h->firm_ver[2] - '0') * 10 +
+ (h->firm_ver[3] - '0');
+ /* 1st generation controllers need >= 2.32 firmware */
+ if (h->pdev->device == PCI_DEVICE_ID_COMPAQ_CISS)
+ return (fw_ver >= 232);
+ /* 2nd generation controllers need >= 1.78 firmware */
+ if (h->pdev->device == PCI_DEVICE_ID_COMPAQ_CISSB)
+ return (fw_ver >= 178);
+ /* All controllers >= 3rd generation (will) support this. */
+ return 1;
+}
+
+static void cciss_allocate_extra_sg_pages(int ctlr)
+{
+ /* Allocate extra SG list pages if supported and requested */
+ if (supports_sg_chaining(hba[ctlr]) && CONFIG_CISS_MAX_SG_PAGES > 1) {
+ hba[ctlr]->sglist_pool = (SGDescriptor_struct *)
+ pci_alloc_consistent(hba[ctlr]->pdev,
+ (CONFIG_CISS_MAX_SG_PAGES-1) * MAXSGENTRIES *
+ NR_CMDS * sizeof(SGDescriptor_struct),
+ &(hba[ctlr]->sglist_pool_dhandle));
+ if (hba[ctlr]->sglist_pool == NULL)
+ printk(KERN_WARNING "cciss%d: Scatter-gather list "
+ "chaining not enabled.", ctlr);
+ }
+}
+
+static inline int figure_sg_limit(int i)
+{
+ /* figure out how many SGs we want to support for this board. */
+ if (supports_sg_chaining(hba[i]) && hba[i]->sglist_pool != NULL)
+ return CONFIG_CISS_MAX_SG_PAGES * (MAXSGENTRIES-1);
+ return MAXSGENTRIES; /* no SG list chaining. */
+}
+
/*
* For operations that cannot sleep, a command block is allocated at init,
* and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
@@ -258,7 +298,7 @@ static void __init cciss_procinit(int i)
static CommandList_struct * cmd_alloc(ctlr_info_t *h, int get_from_pool)
{
CommandList_struct *c;
- int i;
+ int i, j;
u64bit temp64;
dma_addr_t cmd_dma_handle, err_dma_handle;
@@ -273,14 +313,40 @@ static CommandList_struct * cmd_alloc(ct
c->err_info = (ErrorInfo_struct *)pci_alloc_consistent(
h->pdev, sizeof(ErrorInfo_struct),
&err_dma_handle);
-
- if (c->err_info == NULL)
- {
+
+ if (c->err_info == NULL) {
pci_free_consistent(h->pdev,
sizeof(CommandList_struct), c, cmd_dma_handle);
return NULL;
}
+ c->sgdlist[0].sgd = c->SG;
+ c->sgdlist[0].dma = cmd_dma_handle +
+ ((void *) c->SG - (void *) c);
memset(c->err_info, 0, sizeof(ErrorInfo_struct));
+
+ if (h->sglist_pool != NULL) {
+ c->sgdlist[1].sgd = (SGDescriptor_struct *)
+ pci_alloc_consistent(h->pdev, SGD_SIZE *
+ (CONFIG_CISS_MAX_SG_PAGES - 1),
+ &c->sgdlist[0].dma);
+
+ if (c->sgdlist[1].sgd == NULL) {
+ pci_free_consistent(h->pdev,
+ sizeof(ErrorInfo_struct), c->err_info,
+ err_dma_handle);
+ pci_free_consistent(h->pdev,
+ sizeof(CommandList_struct), c,
+ cmd_dma_handle);
+ return NULL;
+ }
+ memset(&c->sgdlist[0].sgd[0], 0, SGD_SIZE);
+ for (j=1;j<CONFIG_CISS_MAX_SG_PAGES-1; j++) {
+ c->sgdlist[j+1].sgd =
+ (void *)c->sgdlist[j].sgd+j*SGD_SIZE;
+ c->sgdlist[j+1].dma =
+ c->sgdlist[j].dma + j * SGD_SIZE;
+ }
+ }
} else /* get it out of the controllers pool */
{
do {
@@ -300,6 +366,20 @@ static CommandList_struct * cmd_alloc(ct
err_dma_handle = h->errinfo_pool_dhandle
+ i*sizeof(ErrorInfo_struct);
h->nr_allocs++;
+ c->sgdlist[0].sgd = c->SG;
+ c->sgdlist[0].dma = cmd_dma_handle +
+ ((void *) c->SG - (void *) c);
+ if (h->sglist_pool != NULL)
+ for (j=0; j < CONFIG_CISS_MAX_SG_PAGES-1 ; j++) {
+ c->sgdlist[j+1].sgd =
+ (void *) h->sglist_pool +
+ SGD_SIZE *
+ (i * (CONFIG_CISS_MAX_SG_PAGES - 1)+j);
+ c->sgdlist[j+1].dma =
+ h->sglist_pool_dhandle +
+ SGD_SIZE *
+ (i * (CONFIG_CISS_MAX_SG_PAGES - 1)+j);
+ }
}
c->busaddr = (__u32) cmd_dma_handle;
@@ -307,11 +387,8 @@ static CommandList_struct * cmd_alloc(ct
c->ErrDesc.Addr.lower = temp64.val32.lower;
c->ErrDesc.Addr.upper = temp64.val32.upper;
c->ErrDesc.Len = sizeof(ErrorInfo_struct);
-
c->ctlr = h->ctlr;
- return c;
-
-
+ return c;
}
/*
@@ -326,6 +403,9 @@ static void cmd_free(ctlr_info_t *h, Com
{
temp64.val32.lower = c->ErrDesc.Addr.lower;
temp64.val32.upper = c->ErrDesc.Addr.upper;
+ pci_free_consistent(h->pdev, SGD_SIZE *
+ CONFIG_CISS_MAX_SG_PAGES,
+ c->sgdlist[0].sgd, c->sgdlist[0].dma);
pci_free_consistent(h->pdev, sizeof(ErrorInfo_struct),
c->err_info, (dma_addr_t) temp64.val);
pci_free_consistent(h->pdev, sizeof(CommandList_struct),
@@ -1771,6 +1851,8 @@ static inline void complete_command( ctl
struct cciss_map_state {
CommandList_struct *command;
int data_dir;
+ int sgelem;
+ int sgpage;
};
static void cciss_map_sg(request_queue_t *q, struct scatterlist *sg, int nseg,
@@ -1778,16 +1860,32 @@ static void cciss_map_sg(request_queue_t
{
struct cciss_map_state *s = cookie;
CommandList_struct *c = s->command;
+ SGDescriptor_struct *sgd;
ctlr_info_t *h= q->queuedata;
u64bit temp64;
- c->SG[nseg].Len = sg->length;
- temp64.val = (__u64) pci_map_page(h->pdev, sg->page, sg->offset,
- sg->length, s->data_dir);
+ sgd = &c->sgdlist[s->sgpage].sgd[s->sgelem];
- c->SG[nseg].Addr.lower = temp64.val32.lower;
- c->SG[nseg].Addr.upper = temp64.val32.upper;
- c->SG[nseg].Ext = 0; // we are not chaining
+ /* if we hit end of SG page, then chain to new SG page, if we can */
+ if (s->sgelem == MAXSGENTRIES-1 && h->sglist_pool) {
+ s->sgpage++;
+ /* Set this SG elem to point to dma-able addr of next SG page */
+ temp64.val = (__u64) c->sgdlist[s->sgpage].dma;
+ sgd->Addr.lower = temp64.val32.lower;
+ sgd->Addr.upper = temp64.val32.upper;
+ sgd->Ext = CISS_SG_CHAIN;
+ sgd->Len = SGD_SIZE; /* total no. of bytes in a SG page. */
+ /* (wrong for last page.) */
+ sgd = &c->sgdlist[s->sgpage].sgd[0];
+ s->sgelem = 0; /* Start at SG zero on the new SG page */
+ }
+ temp64.val = (__u64) pci_map_page(h->pdev, sg->page, sg->offset,
+ sg->length, s->data_dir);
+ sgd->Addr.lower = temp64.val32.lower;
+ sgd->Addr.upper = temp64.val32.upper;
+ sgd->Len = sg->length;
+ sgd->Ext = 0;
+ s->sgelem++;
}
/*
@@ -1810,7 +1908,7 @@ queue:
goto startio;
creq = elv_next_request(q);
- if (creq->nr_phys_segments > MAXSGENTRIES)
+ if (creq->nr_phys_segments > h->sg_limit)
BUG();
if (( c = cmd_alloc(h, 1)) == NULL)
@@ -1849,8 +1947,11 @@ queue:
map_state.data_dir = PCI_DMA_TODEVICE;
map_state.command = c;
+ map_state.sgelem = 0;
+ map_state.sgpage = 0;
seg = blk_rq_map_consume(q, creq, cciss_map_sg, &map_state);
+ seg += map_state.sgpage;
/* track how many SG entries we are using */
if( seg > h->maxSG)
@@ -1860,7 +1961,16 @@ queue:
printk(KERN_DEBUG "cciss: Submitting %d sectors in %d segments\n", creq->nr_sectors, seg);
#endif /* CCISS_DEBUG */
- c->Header.SGList = c->Header.SGTotal = seg;
+ if (seg > MAXSGENTRIES) {
+ c->Header.SGList = MAXSGENTRIES;
+ /* fixup last chained sg page length, probably not SGD_SIZE. */
+ c->sgdlist[map_state.sgpage-1].sgd[MAXSGENTRIES-1].Len =
+ map_state.sgelem * sizeof(SGDescriptor_struct);
+ } else
+ c->Header.SGList = seg;
+
+ c->Header.SGTotal = seg;
+
c->Request.CDB[1]= 0;
c->Request.CDB[2]= (start_blk >> 24) & 0xff; //MSB
c->Request.CDB[3]= (start_blk >> 16) & 0xff;
@@ -2328,6 +2438,33 @@ static void free_hba(int i)
kfree(p);
}
+
+static void bail_out(int i)
+{
+ if(hba[i]->cmd_pool_bits)
+ kfree(hba[i]->cmd_pool_bits);
+ if(hba[i]->cmd_pool)
+ pci_free_consistent(hba[i]->pdev,
+ NR_CMDS * sizeof(CommandList_struct),
+ hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
+ if(hba[i]->errinfo_pool)
+ pci_free_consistent(hba[i]->pdev,
+ NR_CMDS * sizeof( ErrorInfo_struct),
+ hba[i]->errinfo_pool,
+ hba[i]->errinfo_pool_dhandle);
+ if (hba[i]->sglist_pool != NULL)
+ pci_free_consistent(hba[i]->pdev,
+ (CONFIG_CISS_MAX_SG_PAGES-1) * MAXSGENTRIES *
+ NR_CMDS * sizeof(SGDescriptor_struct),
+ hba[i]->sglist_pool,
+ hba[i]->sglist_pool_dhandle);
+ free_irq(hba[i]->intr, hba[i]);
+ unregister_blkdev(MAJOR_NR+i, hba[i]->devname);
+ release_io_mem(hba[i]);
+ free_hba(i);
+ printk( KERN_ERR "cciss: out of memory");
+}
+
/*
* This is it. Find all the controllers and register them. I really hate
* stealing all these major device numbers.
@@ -2376,6 +2513,11 @@ static int __init cciss_init_one(struct
free_hba(i);
return(-1);
}
+ /* Assume we can't do SG page chaining until we know otherwise */
+ hba[i]->sglist_pool = NULL;
+ hba[i]->sglist_pool_dhandle = (dma_addr_t) NULL;
+ hba[i]->sg_limit = MAXSGENTRIES;
+
/* make sure the board interrupts are off */
hba[i]->access.set_intr_mask(hba[i], CCISS_INTR_OFF);
if( request_irq(hba[i]->intr, do_cciss_intr,
@@ -2398,24 +2540,8 @@ static int __init cciss_init_one(struct
&(hba[i]->errinfo_pool_dhandle));
if((hba[i]->cmd_pool_bits == NULL)
|| (hba[i]->cmd_pool == NULL)
- || (hba[i]->errinfo_pool == NULL))
- {
- if(hba[i]->cmd_pool_bits)
- kfree(hba[i]->cmd_pool_bits);
- if(hba[i]->cmd_pool)
- pci_free_consistent(hba[i]->pdev,
- NR_CMDS * sizeof(CommandList_struct),
- hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
- if(hba[i]->errinfo_pool)
- pci_free_consistent(hba[i]->pdev,
- NR_CMDS * sizeof( ErrorInfo_struct),
- hba[i]->errinfo_pool,
- hba[i]->errinfo_pool_dhandle);
- free_irq(hba[i]->intr, hba[i]);
- unregister_blkdev(MAJOR_NR+i, hba[i]->devname);
- release_io_mem(hba[i]);
- free_hba(i);
- printk( KERN_ERR "cciss: out of memory");
+ || (hba[i]->errinfo_pool == NULL)) {
+ bail_out(i);
return(-1);
}
@@ -2431,7 +2557,7 @@ static int __init cciss_init_one(struct
#endif /* CCISS_DEBUG */
cciss_getgeometry(i);
-
+ cciss_allocate_extra_sg_pages(i);
cciss_scsi_setup(i);
/* Turn the interrupts on so we can service requests */
@@ -2439,21 +2565,16 @@ static int __init cciss_init_one(struct
cciss_procinit(i);
+ hba[i]->sg_limit = figure_sg_limit(i);
q = &hba[i]->queue;
q->queuedata = hba[i];
spin_lock_init(&hba[i]->lock);
blk_init_queue(q, do_cciss_request, &hba[i]->lock);
blk_queue_bounce_limit(q, hba[i]->pdev->dma_mask);
-
- /* This is a hardware imposed limit. */
- blk_queue_max_hw_segments(q, MAXSGENTRIES);
-
- /* This is a limit in the driver and could be eliminated. */
- blk_queue_max_phys_segments(q, MAXSGENTRIES);
-
+ blk_queue_max_hw_segments(q, hba[i]->sg_limit);
+ blk_queue_max_phys_segments(q, hba[i]->sg_limit);
blk_queue_max_sectors(q, 512);
-
for(j=0; j<NWD; j++) {
drive_info_struct *drv = &(hba[i]->drv[j]);
struct gendisk *disk = hba[i]->gendisk[j];
@@ -2521,6 +2642,11 @@ static void __devexit cciss_remove_one (
hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);
pci_free_consistent(hba[i]->pdev, NR_CMDS * sizeof( ErrorInfo_struct),
hba[i]->errinfo_pool, hba[i]->errinfo_pool_dhandle);
+ if (hba[i]->sglist_pool != NULL)
+ pci_free_consistent(hba[i]->pdev,
+ (CONFIG_CISS_MAX_SG_PAGES-1) * MAXSGENTRIES *
+ NR_CMDS * sizeof(SGDescriptor_struct),
+ hba[i]->sglist_pool, hba[i]->sglist_pool_dhandle);
kfree(hba[i]->cmd_pool_bits);
release_io_mem(hba[i]);
free_hba(i);
--- lx2544ac3/drivers/block/cciss_cmd.h~sgc3 Mon Oct 28 15:18:44 2002
+++ lx2544ac3-root/drivers/block/cciss_cmd.h Mon Oct 28 15:42:13 2002
@@ -7,6 +7,10 @@
//general boundary defintions
#define SENSEINFOBYTES 32//note that this value may vary between host implementations
+
+/* MAXSGENTRIES is the max scatter gather entries per SG page,
+ some adapters support chaining SG pages, using the last SG
+ entry to point to the next SG page. */
#define MAXSGENTRIES 31
#define MAXREPLYQS 256
@@ -195,8 +199,11 @@ typedef struct _SGDescriptor_struct {
QWORD Addr;
DWORD Len;
DWORD Ext;
+#define CISS_SG_CHAIN 0x80000000
} SGDescriptor_struct;
+#define SGD_SIZE (sizeof(SGDescriptor_struct) * MAXSGENTRIES)
+
typedef union _MoreErrInfo_struct{
struct {
BYTE Reserved[3];
@@ -226,6 +233,11 @@ typedef struct _ErrorInfo_struct {
#define CMD_MSG_DONE 0x04
#define CMD_MSG_TIMEOUT 0x05
+struct sgd_list_t {
+ SGDescriptor_struct *sgd;
+ dma_addr_t dma;
+};
+
typedef struct _CommandList_struct {
CommandListHeader_struct Header;
RequestBlock_struct Request;
@@ -241,6 +253,7 @@ typedef struct _CommandList_struct {
struct request * rq;
struct completion *waiting;
int retry_count;
+ struct sgd_list_t sgdlist[CONFIG_CISS_MAX_SG_PAGES];
#ifdef CONFIG_CISS_SCSI_TAPE
void * scsi_cmd;
#endif
--- lx2544ac3/drivers/block/cciss.h~sgc3 Mon Oct 28 15:18:44 2002
+++ lx2544ac3-root/drivers/block/cciss.h Mon Oct 28 15:18:44 2002
@@ -36,6 +36,13 @@ typedef struct _drive_info_struct
int cylinders;
} drive_info_struct;
+#if CONFIG_CISS_MAX_SG_PAGES < 1
+#error "CONFIG_CISS_MAX_SG_PAGES must be greater than 0 and less than 9"
+#elif CONFIG_CISS_MAX_SG_PAGES > 8
+/* eight is rather arbitrary...no real limit here. */
+#error "CONFIG_CISS_MAX_SG_PAGES must be greater than 0 and less than 9"
+#endif
+
struct ctlr_info
{
int ctlr;
@@ -77,9 +84,12 @@ struct ctlr_info
dma_addr_t cmd_pool_dhandle;
ErrorInfo_struct *errinfo_pool;
dma_addr_t errinfo_pool_dhandle;
+ SGDescriptor_struct *sglist_pool;
+ dma_addr_t sglist_pool_dhandle;
unsigned long *cmd_pool_bits;
int nr_allocs;
int nr_frees;
+ int sg_limit;
// Disk structures we need to pass back
struct gendisk *gendisk[NWD];
--- lx2544ac3/drivers/block/cciss_scsi.c~sgc3 Mon Oct 28 15:18:44 2002
+++ lx2544ac3-root/drivers/block/cciss_scsi.c Mon Oct 28 15:18:44 2002
@@ -257,7 +257,7 @@ scsi_cmd_stack_free(int ctlr)
"Unknown" : scsi_device_types[n]
#if 0
-static int xmargin=8;
+static int xmargin=24;
static int amargin=60;
static void
@@ -297,6 +297,10 @@ print_bytes (unsigned char *c, int len,
static void
print_cmd(CommandList_struct *cp)
{
+ int i;
+ int sg, sgp;
+ SGDescriptor_struct *sgd;
+
printk("queue:%d\n", cp->Header.ReplyQueue);
printk("sglist:%d\n", cp->Header.SGList);
printk("sgtot:%d\n", cp->Header.SGTotal);
@@ -329,7 +333,25 @@ print_cmd(CommandList_struct *cp)
printk("edesc.Addr: 0x%08x/0%08x, Len = %d\n",
cp->ErrDesc.Addr.upper, cp->ErrDesc.Addr.lower,
cp->ErrDesc.Len);
- printk("sgs..........Errorinfo:\n");
+ printk("SGS:\n");
+ sgp = 0; sg = 0;
+ sgd = cp->sgdlist[sgp].sgd;
+ for (i=0;i<cp->Header.SGTotal;i++) {
+ printk("0x%08x%08x : %d: %d %s\n", sgd[sg].Addr.upper,
+ sgd[sg].Addr.lower, sgd[sg].Len,
+ sgd[sg].Ext, sg >= MAXSGENTRIES-1 ? " chain" : "");
+
+ if (sg == MAXSGENTRIES-1 && ! sgd[sg].Ext &&
+ cp->Header.SGTotal != cp->Header.SGList)
+ printk("Extended SG bit expected, but not set!\n");
+ sg++;
+ if (sg >= MAXSGENTRIES) {
+ sg = 0;
+ sgp++;
+ sgd = cp->sgdlist[sgp].sgd;
+ }
+ }
+ printk("Errorinfo:\n");
printk("scsistatus:%d\n", cp->err_info->ScsiStatus);
printk("senselen:%d\n", cp->err_info->SenseLen);
printk("cmd status:%d\n", cp->err_info->CommandStatus);
--- lx2544ac3/drivers/block/Config.help~sgc3 Mon Oct 28 15:18:44 2002
+++ lx2544ac3-root/drivers/block/Config.help Mon Oct 28 15:18:44 2002
@@ -196,6 +196,22 @@ CONFIG_BLK_CPQ_CISS_DA
boards supported by this driver, and for further information
on the use of this driver.
+CONFIG_CISS_MAX_SG_PAGES
+ This is the number of scatter gather pages to pre-allocate
+ for each command block. Each page for each command can hold
+ up to 31 scatter gather elements. Values greater than 1 may
+ yield better performance at the cost of memory usage. The
+ minumum value is 1, which is also likely to be a reasonable
+ value. You may observe the values reported in
+ /proc/driver/cciss/cciss* for "Max SG entries since init X/Y".
+ There are two values, X/Y, where X is the maximum number of SG
+ elements used by any one command so far, and Y is the total
+ number of scatter gather elements available for each command.
+ If X == Y, then at least once, some command used up all its
+ available scatter gather elements. If X remains less than Y
+ after some period of running a typical load, then there is no
+ benefit in increasing this parameter.
+
CONFIG_CISS_SCSI_TAPE
When enabled (Y), this option allows SCSI tape drives and SCSI medium
changers (tape robots) to be accessed via a Compaq 5xxx array
--- lx2544ac3/drivers/block/Config.in~sgc3 Mon Oct 28 15:18:44 2002
+++ lx2544ac3-root/drivers/block/Config.in Mon Oct 28 15:18:44 2002
@@ -35,6 +35,9 @@ if [ "$CONFIG_PARIDE" = "y" -o "$CONFIG_
fi
dep_tristate 'Compaq SMART2 support' CONFIG_BLK_CPQ_DA $CONFIG_PCI
dep_tristate 'Compaq Smart Array 5xxx support' CONFIG_BLK_CPQ_CISS_DA $CONFIG_PCI
+if [ "$CONFIG_BLK_CPQ_CISS_DA" = "y" -o "$CONFIG_BLK_CPQ_CISS_DA" = "m" ]; then
+ int ' Maximum scatter gather pages per command' CONFIG_CISS_MAX_SG_PAGES 1
+fi
dep_mbool ' SCSI tape drive support for Smart Array 5xxx' CONFIG_CISS_SCSI_TAPE $CONFIG_BLK_CPQ_CISS_DA $CONFIG_SCSI
dep_tristate 'Mylex DAC960/DAC1100 PCI RAID Controller support' CONFIG_BLK_DEV_DAC960 $CONFIG_PCI
dep_tristate 'Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)' CONFIG_BLK_DEV_UMEM $CONFIG_PCI $CONFIG_EXPERIMENTAL
.
-
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