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cxgb3i: suppot of different kernel page sizes

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The default kernel pages supported are 4K, 8K, 16K, and 64K. Re-calculate
entries if PAGE_SIZE is not one of the defaults.

Signed-off-by: Karen Xie <kxie@chelsio.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Karen Xie 2009-06-15 11:15:16 -07:00 committed by James Bottomley
parent 295ab1b543
commit 9194c62640
1 changed files with 36 additions and 0 deletions
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36
drivers/scsi/cxgb3i/cxgb3i_ddp.c
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@ -206,6 +206,31 @@ int cxgb3i_ddp_find_page_index(unsigned long pgsz)
return DDP_PGIDX_MAX; return DDP_PGIDX_MAX;
} }
/**
* cxgb3i_ddp_adjust_page_table - adjust page table with PAGE_SIZE
* return the ddp page index, if no match is found return DDP_PGIDX_MAX.
*/
int cxgb3i_ddp_adjust_page_table(void)
{
int i;
unsigned int base_order, order;
if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
ddp_log_info("PAGE_SIZE 0x%lx too small, min. 0x%lx.\n",
PAGE_SIZE, 1UL << ddp_page_shift[0]);
return -EINVAL;
}
base_order = get_order(1UL << ddp_page_shift[0]);
order = get_order(1 << PAGE_SHIFT);
for (i = 0; i < DDP_PGIDX_MAX; i++) {
/* first is the kernel page size, then just doubling the size */
ddp_page_order[i] = order - base_order + i;
ddp_page_shift[i] = PAGE_SHIFT + i;
}
return 0;
}
static inline void ddp_gl_unmap(struct pci_dev *pdev, static inline void ddp_gl_unmap(struct pci_dev *pdev,
struct cxgb3i_gather_list *gl) struct cxgb3i_gather_list *gl)
{ {
@ -727,6 +752,17 @@ void cxgb3i_ddp_init(struct t3cdev *tdev)
{ {
if (page_idx == DDP_PGIDX_MAX) { if (page_idx == DDP_PGIDX_MAX) {
page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE); page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
if (page_idx == DDP_PGIDX_MAX) {
ddp_log_info("system PAGE_SIZE %lu, update hw.\n",
PAGE_SIZE);
if (cxgb3i_ddp_adjust_page_table() < 0) {
ddp_log_info("PAGE_SIZE %lu, ddp disabled.\n",
PAGE_SIZE);
return;
}
page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
}
ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n", ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
PAGE_SIZE, page_idx); PAGE_SIZE, page_idx);
} }