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hpsa: refactor hpsa_find_board_params() to encapsulate legacy test 

Encapsulate the conditional predicate which tests for legacy controllers
in a separate function and rework the code comments.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Webb Scales <webbnh@hp.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Webb Scales 2015-01-23 16:42:17 -06:00 committed by James Bottomley
parent 1ba66c9cc3
commit c7ee65b384
1 changed files with 21 additions and 9 deletions
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30
drivers/scsi/hpsa.c
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@ -3107,7 +3107,8 @@ static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno)
kfree(logdev_list);
}
/* hpsa_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci
/*
* hpsa_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci
* dma mapping and fills in the scatter gather entries of the
* hpsa command, cp.
*/
@ -3165,7 +3166,7 @@ static int hpsa_scatter_gather(struct ctlr_info *h,
sglist_finished:
cp->Header.SGList = (u8) use_sg; /* no. SGs contig in this cmd */
cp->Header.SGTotal = cpu_to_le16(use_sg); /* total sgs in this cmd list */
cp->Header.SGTotal = cpu_to_le16(use_sg); /* total sgs in cmd list */
return 0;
}
@ -6162,6 +6163,15 @@ static void hpsa_get_max_perf_mode_cmds(struct ctlr_info *h)
}
}
/* If the controller reports that the total max sg entries is greater than 512,
* then we know that chained SG blocks work. (Original smart arrays did not
* support chained SG blocks and would return zero for max sg entries.)
*/
static int hpsa_supports_chained_sg_blocks(struct ctlr_info *h)
{
return h->maxsgentries > 512;
}
/* Interrogate the hardware for some limits:
* max commands, max SG elements without chaining, and with chaining,
* SG chain block size, etc.
@ -6172,18 +6182,20 @@ static void hpsa_find_board_params(struct ctlr_info *h)
h->nr_cmds = h->max_commands - 4; /* Allow room for some ioctls */
h->maxsgentries = readl(&(h->cfgtable->MaxScatterGatherElements));
h->fw_support = readl(&(h->cfgtable->misc_fw_support));
/*
* 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) {
if (hpsa_supports_chained_sg_blocks(h)) {
/* Limit in-command s/g elements to 32 save dma'able memory. */
h->max_cmd_sg_entries = 32;
h->chainsize = h->maxsgentries - h->max_cmd_sg_entries;
h->maxsgentries--; /* save one for chain pointer */
} else {
h->chainsize = 0;
/*
* Original smart arrays supported at most 31 s/g entries
* embedded inline in the command (trying to use more
* would lock up the controller)
*/
h->max_cmd_sg_entries = 31;
h->maxsgentries = 31; /* default to traditional values */
h->chainsize = 0;
}
/* Find out what task management functions are supported and cache */