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[SCSI] hpsa: hpsa factor out hpsa_find_board_params

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Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Stephen M. Cameron 2010-05-27 15:13:27 -05:00 committed by James Bottomley
parent 204892e971
commit b93d7536ea
1 changed files with 25 additions and 21 deletions
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46
drivers/scsi/hpsa.c
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@ -3348,6 +3348,30 @@ static int __devinit hpsa_find_cfgtables(struct ctlr_info *h)
return 0; return 0;
} }
/* Interrogate the hardware for some limits:
* max commands, max SG elements without chaining, and with chaining,
* SG chain block size, etc.
*/
static void __devinit hpsa_find_board_params(struct ctlr_info *h)
{
h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
h->nr_cmds = h->max_commands - 4; /* Allow room for some ioctls */
h->maxsgentries = readl(&(h->cfgtable->MaxScatterGatherElements));
/*
* Limit in-command s/g elements to 32 save dma'able memory.
* Howvever spec says if 0, use 31
*/
h->max_cmd_sg_entries = 31;
if (h->maxsgentries > 512) {
h->max_cmd_sg_entries = 32;
h->chainsize = h->maxsgentries - h->max_cmd_sg_entries + 1;
h->maxsgentries--; /* save one for chain pointer */
} else {
h->maxsgentries = 31; /* default to traditional values */
h->chainsize = 0;
}
}
static int __devinit hpsa_pci_init(struct ctlr_info *h) static int __devinit hpsa_pci_init(struct ctlr_info *h)
{ {
int i, prod_index, err; int i, prod_index, err;
@ -3389,27 +3413,7 @@ static int __devinit hpsa_pci_init(struct ctlr_info *h)
err = hpsa_find_cfgtables(h); err = hpsa_find_cfgtables(h);
if (err) if (err)
goto err_out_free_res; goto err_out_free_res;
hpsa_find_board_params(h);
h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
h->maxsgentries = readl(&(h->cfgtable->MaxScatterGatherElements));
/*
* Limit in-command s/g elements to 32 save dma'able memory.
* Howvever spec says if 0, use 31
*/
h->max_cmd_sg_entries = 31;
if (h->maxsgentries > 512) {
h->max_cmd_sg_entries = 32;
h->chainsize = h->maxsgentries - h->max_cmd_sg_entries + 1;
h->maxsgentries--; /* save one for chain pointer */
} else {
h->maxsgentries = 31; /* default to traditional values */
h->chainsize = 0;
}
/* Allow room for some ioctls */
h->nr_cmds = h->max_commands - 4;
if ((readb(&h->cfgtable->Signature[0]) != 'C') || if ((readb(&h->cfgtable->Signature[0]) != 'C') ||
(readb(&h->cfgtable->Signature[1]) != 'I') || (readb(&h->cfgtable->Signature[1]) != 'I') ||