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Fix a braino in r236469; the number of DMA tags required for handling

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MAXPHYS should be based on PAGE_SIZE rather than SYM_CONF_DMA_BOUNDARY.
While at it, reuse the SYM_CONF_MAX_SG macro for specifying the maximum
number of DMA tags so sym(4) itself doesn't size memory beyond what's
required for handling MAXPHYS.

PR:		168928
MFC after:	3 days
This commit is contained in:
Marius Strobl 2012-06-14 20:49:22 +00:00
parent d2a3fae7ec
commit 4bc42357a9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=237101
2 changed files with 6 additions and 8 deletions
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7
sys/dev/sym/sym_conf.h
View File

@ -90,11 +90,12 @@
#define SYM_CONF_DMA_BOUNDARY (1UL << 24)
/*
* Max number of scatter/gather entries for en IO.
* Max number of scatter/gather entries for an I/O.
* Each entry costs 8 bytes in the internal CCB data structure.
* For now 65 should suffice given the BSD O/Ses capabilities.
* We use at most 33 segments but also no more than required for handling
* MAXPHYS.
*/
#define SYM_CONF_MAX_SG (33)
#define SYM_CONF_MAX_SG (MIN(33, (MAXPHYS / PAGE_SIZE) + 1))
/*
* Max number of targets.

7
sys/dev/sym/sym_hipd.c
View File

@ -1609,7 +1609,6 @@ struct sym_hcb {
u_int features; /* Chip features map */
u_char myaddr; /* SCSI id of the adapter */
u_char maxburst; /* log base 2 of dwords burst */
u_char maxsegcnt; /* Max DMA S/G segments */
u_char maxwide; /* Maximum transfer width */
u_char minsync; /* Min sync period factor (ST) */
u_char maxsync; /* Max sync period factor (ST) */
@ -8135,7 +8134,7 @@ static void sym_action2(struct cam_sim *sim, union ccb *ccb)
cpi->xport_specific.spi.ppr_options =
SID_SPI_CLOCK_DT_ST;
}
cpi->maxio = np->maxsegcnt * SYM_CONF_DMA_BOUNDARY;
cpi->maxio = SYM_CONF_MAX_SG * PAGE_SIZE;
sym_xpt_done2(np, ccb, CAM_REQ_CMP);
break;
case XPT_ABORT:
@ -8536,11 +8535,9 @@ sym_pci_attach(device_t dev)
/*
* Allocate a tag for the DMA of user data.
*/
np->maxsegcnt = MIN(SYM_CONF_MAX_SG,
(MAXPHYS / SYM_CONF_DMA_BOUNDARY) + 1);
if (bus_dma_tag_create(np->bus_dmat, 1, SYM_CONF_DMA_BOUNDARY,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
BUS_SPACE_MAXSIZE, np->maxsegcnt, SYM_CONF_DMA_BOUNDARY,
BUS_SPACE_MAXSIZE, SYM_CONF_MAX_SG, SYM_CONF_DMA_BOUNDARY,
BUS_DMA_ALLOCNOW, busdma_lock_mutex, &np->mtx, &np->data_dmat)) {
device_printf(dev, "failed to create DMA tag.\n");
goto attach_failed;