cxgb3i: suppot of different kernel page sizes
Karen Xie [Mon, 15 Jun 2009 18:15:16 +0000 (11:15 -0700)]
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>

drivers/scsi/cxgb3i/cxgb3i_ddp.c

index 8eb2848..344fd53 100644 (file)
@@ -206,6 +206,31 @@ int cxgb3i_ddp_find_page_index(unsigned long pgsz)
        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,
                                struct cxgb3i_gather_list *gl)
 {
@@ -727,6 +752,17 @@ void cxgb3i_ddp_init(struct t3cdev *tdev)
 {
        if (page_idx == DDP_PGIDX_MAX) {
                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",
                                PAGE_SIZE, page_idx);
        }