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cciss: factor out cciss_enter_performant_mode

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cciss: factor out cciss_enter_performant_mode

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Stephen M. Cameron 2010-07-19 13:46:07 -05:00 committed by Jens Axboe
parent 0f8a6a1e7b
commit b993313540
1 changed files with 61 additions and 41 deletions
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102
drivers/block/cciss.c
View file

@ -3830,21 +3830,76 @@ static void __devinit cciss_wait_for_mode_change_ack(ctlr_info_t *h)
}
}
static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
static __devinit void cciss_enter_performant_mode(ctlr_info_t *h)
{
__u32 trans_support;
/* This is a bit complicated. There are 8 registers on
* the controller which we write to to tell it 8 different
* sizes of commands which there may be. It's a way of
* reducing the DMA done to fetch each command. Encoded into
* each command's tag are 3 bits which communicate to the controller
* which of the eight sizes that command fits within. The size of
* each command depends on how many scatter gather entries there are.
* Each SG entry requires 16 bytes. The eight registers are programmed
* with the number of 16-byte blocks a command of that size requires.
* The smallest command possible requires 5 such 16 byte blocks.
* the largest command possible requires MAXSGENTRIES + 4 16-byte
* blocks. Note, this only extends to the SG entries contained
* within the command block, and does not extend to chained blocks
* of SG elements. bft[] contains the eight values we write to
* the registers. They are not evenly distributed, but have more
* sizes for small commands, and fewer sizes for larger commands.
*/
__u32 trans_offset;
int bft[8] = { 5, 6, 8, 10, 12, 20, 28, MAXSGENTRIES + 4};
/*
* 5 = 1 s/g entry or 4k
* 6 = 2 s/g entry or 8k
* 8 = 4 s/g entry or 16k
* 10 = 6 s/g entry or 24k
*/
int bft[8] = { 5, 6, 8, 10, 12, 20, 28, MAXSGENTRIES + 4};
unsigned long register_value;
BUILD_BUG_ON(28 > MAXSGENTRIES + 4);
h->reply_pool_wraparound = 1; /* spec: init to 1 */
/* Controller spec: zero out this buffer. */
memset(h->reply_pool, 0, h->max_commands * sizeof(__u64));
h->reply_pool_head = h->reply_pool;
trans_offset = readl(&(h->cfgtable->TransMethodOffset));
calc_bucket_map(bft, ARRAY_SIZE(bft), h->maxsgentries,
h->blockFetchTable);
writel(bft[0], &h->transtable->BlockFetch0);
writel(bft[1], &h->transtable->BlockFetch1);
writel(bft[2], &h->transtable->BlockFetch2);
writel(bft[3], &h->transtable->BlockFetch3);
writel(bft[4], &h->transtable->BlockFetch4);
writel(bft[5], &h->transtable->BlockFetch5);
writel(bft[6], &h->transtable->BlockFetch6);
writel(bft[7], &h->transtable->BlockFetch7);
/* size of controller ring buffer */
writel(h->max_commands, &h->transtable->RepQSize);
writel(1, &h->transtable->RepQCount);
writel(0, &h->transtable->RepQCtrAddrLow32);
writel(0, &h->transtable->RepQCtrAddrHigh32);
writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
writel(0, &h->transtable->RepQAddr0High32);
writel(CFGTBL_Trans_Performant,
&(h->cfgtable->HostWrite.TransportRequest));
writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
cciss_wait_for_mode_change_ack(h);
register_value = readl(&(h->cfgtable->TransportActive));
if (!(register_value & CFGTBL_Trans_Performant))
printk(KERN_WARNING "cciss: unable to get board into"
" performant mode\n");
}
static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
{
__u32 trans_support;
dev_dbg(&h->pdev->dev, "Trying to put board into Performant mode\n");
/* Attempt to put controller into performant mode if supported */
/* Does board support performant mode? */
@ -3878,46 +3933,11 @@ static void __devinit cciss_put_controller_into_performant_mode(ctlr_info_t *h)
if ((h->reply_pool == NULL) || (h->blockFetchTable == NULL))
goto clean_up;
h->reply_pool_wraparound = 1; /* spec: init to 1 */
/* Controller spec: zero out this buffer. */
memset(h->reply_pool, 0, h->max_commands * sizeof(__u64));
h->reply_pool_head = h->reply_pool;
trans_offset = readl(&(h->cfgtable->TransMethodOffset));
calc_bucket_map(bft, ARRAY_SIZE(bft), h->maxsgentries,
h->blockFetchTable);
writel(bft[0], &h->transtable->BlockFetch0);
writel(bft[1], &h->transtable->BlockFetch1);
writel(bft[2], &h->transtable->BlockFetch2);
writel(bft[3], &h->transtable->BlockFetch3);
writel(bft[4], &h->transtable->BlockFetch4);
writel(bft[5], &h->transtable->BlockFetch5);
writel(bft[6], &h->transtable->BlockFetch6);
writel(bft[7], &h->transtable->BlockFetch7);
/* size of controller ring buffer */
writel(h->max_commands, &h->transtable->RepQSize);
writel(1, &h->transtable->RepQCount);
writel(0, &h->transtable->RepQCtrAddrLow32);
writel(0, &h->transtable->RepQCtrAddrHigh32);
writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
writel(0, &h->transtable->RepQAddr0High32);
writel(CFGTBL_Trans_Performant,
&(h->cfgtable->HostWrite.TransportRequest));
h->transMethod = CFGTBL_Trans_Performant;
writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
cciss_wait_for_mode_change_ack(h);
register_value = readl(&(h->cfgtable->TransportActive));
if (!(register_value & CFGTBL_Trans_Performant)) {
printk(KERN_WARNING "cciss: unable to get board into"
" performant mode\n");
return;
}
cciss_enter_performant_mode(h);
/* Change the access methods to the performant access methods */
h->access = SA5_performant_access;
h->transMethod = CFGTBL_Trans_Performant;
return;
clean_up: