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[SCSI] hpsa: removed unneeded structure member max_sg_entries and fix badly named constant MAXSGENTRIES

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We had both h->max_sg_entries and h->maxsgentries in the per controller
structure which is terribly confusing.  max_sg_entries was really
just a constant, 32, which defines how big the "block fetch table"
is, which is as large as the max number of SG elements embedded
within a command (excluding SG elements in chain blocks).

MAXSGENTRIES was the constant used to denote the max number of SG
elements embedded within a command, also a poor name.

So renamed MAXSGENTREIS to SG_ENTRIES_IN_CMD, and removed
h->max_sg_entries and replaced it with SG_ENTRIES_IN_CMD.

h->maxsgentries is unchanged, and is the maximum number of sg
elements the controller will support in a command, including
those in chain blocks, minus 1 for the chain block pointer..

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Stephen M. Cameron 2012-01-19 14:00:48 -06:00 committed by James Bottomley
parent 55e14e764d
commit d66ae08bad
3 changed files with 12 additions and 13 deletions
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20
drivers/scsi/hpsa.c
View file

@ -2700,16 +2700,16 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
status = -EINVAL;
goto cleanup1;
}
if (ioc->buf_size > ioc->malloc_size * MAXSGENTRIES) {
if (ioc->buf_size > ioc->malloc_size * SG_ENTRIES_IN_CMD) {
status = -EINVAL;
goto cleanup1;
}
buff = kzalloc(MAXSGENTRIES * sizeof(char *), GFP_KERNEL);
buff = kzalloc(SG_ENTRIES_IN_CMD * sizeof(char *), GFP_KERNEL);
if (!buff) {
status = -ENOMEM;
goto cleanup1;
}
buff_size = kmalloc(MAXSGENTRIES * sizeof(int), GFP_KERNEL);
buff_size = kmalloc(SG_ENTRIES_IN_CMD * sizeof(int), GFP_KERNEL);
if (!buff_size) {
status = -ENOMEM;
goto cleanup1;
@ -4601,15 +4601,15 @@ static __devinit void hpsa_enter_performant_mode(struct ctlr_info *h,
* 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
* the largest command possible requires SG_ENTRIES_IN_CMD + 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.
*/
int bft[8] = {5, 6, 8, 10, 12, 20, 28, MAXSGENTRIES + 4};
BUILD_BUG_ON(28 > MAXSGENTRIES + 4);
int bft[8] = {5, 6, 8, 10, 12, 20, 28, SG_ENTRIES_IN_CMD + 4};
BUILD_BUG_ON(28 > SG_ENTRIES_IN_CMD + 4);
/* 5 = 1 s/g entry or 4k
* 6 = 2 s/g entry or 8k
* 8 = 4 s/g entry or 16k
@ -4622,8 +4622,9 @@ static __devinit void hpsa_enter_performant_mode(struct ctlr_info *h,
memset(h->reply_pool, 0, h->reply_pool_size);
h->reply_pool_head = h->reply_pool;
bft[7] = h->max_sg_entries + 4;
calc_bucket_map(bft, ARRAY_SIZE(bft), 32, h->blockFetchTable);
bft[7] = SG_ENTRIES_IN_CMD + 4;
calc_bucket_map(bft, ARRAY_SIZE(bft),
SG_ENTRIES_IN_CMD, h->blockFetchTable);
for (i = 0; i < 8; i++)
writel(bft[i], &h->transtable->BlockFetch[i]);
@ -4661,14 +4662,13 @@ static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
return;
hpsa_get_max_perf_mode_cmds(h);
h->max_sg_entries = 32;
/* Performant mode ring buffer and supporting data structures */
h->reply_pool_size = h->max_commands * sizeof(u64);
h->reply_pool = pci_alloc_consistent(h->pdev, h->reply_pool_size,
&(h->reply_pool_dhandle));
/* Need a block fetch table for performant mode */
h->blockFetchTable = kmalloc(((h->max_sg_entries+1) *
h->blockFetchTable = kmalloc(((SG_ENTRIES_IN_CMD + 1) *
sizeof(u32)), GFP_KERNEL);
if ((h->reply_pool == NULL)

1
drivers/scsi/hpsa.h
View file

@ -58,7 +58,6 @@ struct ctlr_info {
unsigned long paddr;
int nr_cmds; /* Number of commands allowed on this controller */
struct CfgTable __iomem *cfgtable;
int max_sg_entries;
int interrupts_enabled;
int major;
int max_commands;

4
drivers/scsi/hpsa_cmd.h
View file

@ -23,7 +23,7 @@
/* general boundary defintions */
#define SENSEINFOBYTES 32 /* may vary between hbas */
#define MAXSGENTRIES 32
#define SG_ENTRIES_IN_CMD 32 /* Max SG entries excluding chain blocks */
#define HPSA_SG_CHAIN 0x80000000
#define MAXREPLYQS 256
@ -282,7 +282,7 @@ struct CommandList {
struct CommandListHeader Header;
struct RequestBlock Request;
struct ErrDescriptor ErrDesc;
struct SGDescriptor SG[MAXSGENTRIES];
struct SGDescriptor SG[SG_ENTRIES_IN_CMD];
/* information associated with the command */
u32 busaddr; /* physical addr of this record */
struct ErrorInfo *err_info; /* pointer to the allocated mem */