diff options
Diffstat (limited to 'drivers/scsi/hpsa.c')
| -rw-r--r-- | drivers/scsi/hpsa.c | 46 |
1 files changed, 25 insertions, 21 deletions
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index 4983f3452dc4..dcbe54b1dfba 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -3348,6 +3348,30 @@ static int __devinit hpsa_find_cfgtables(struct ctlr_info *h) 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) { int i, prod_index, err; @@ -3389,27 +3413,7 @@ static int __devinit hpsa_pci_init(struct ctlr_info *h) err = hpsa_find_cfgtables(h); if (err) goto err_out_free_res; - - 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; + hpsa_find_board_params(h); if ((readb(&h->cfgtable->Signature[0]) != 'C') || (readb(&h->cfgtable->Signature[1]) != 'I') || |