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iommu sg: powerpc: remove DMA 4GB boundary protection 

Previously, during initialization of the IOMMU tables, the last entry
at each 4GB boundary is marked as used since there are many adapters
which cannot handle DMAing across any 4GB boundary.

The IOMMU doesn't allocate a memory area spanning LLD's segment
boundary anymore. The segment boundary of devices are set to 4GB by
default. So we can remove 4GB boundary protection now.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2008-02-04 22:28:09 -08:00 committed by Linus Torvalds
parent fb3475e9b6
commit 383af9525b
1 changed files with 1 additions and 20 deletions
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21
arch/powerpc/kernel/iommu.c
View File

@ -453,9 +453,6 @@ void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
{
unsigned long sz;
unsigned long start_index, end_index;
unsigned long entries_per_4g;
unsigned long index;
static int welcomed = 0;
struct page *page;
@ -477,6 +474,7 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
#ifdef CONFIG_CRASH_DUMP
if (ppc_md.tce_get) {
unsigned long index;
unsigned long tceval;
unsigned long tcecount = 0;
@ -507,23 +505,6 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid)
ppc_md.tce_free(tbl, tbl->it_offset, tbl->it_size);
#endif
/*
* DMA cannot cross 4 GB boundary. Mark last entry of each 4
* GB chunk as reserved.
*/
if (protect4gb) {
entries_per_4g = 0x100000000l >> IOMMU_PAGE_SHIFT;
/* Mark the last bit before a 4GB boundary as used */
start_index = tbl->it_offset | (entries_per_4g - 1);
start_index -= tbl->it_offset;
end_index = tbl->it_size;
for (index = start_index; index < end_index - 1; index += entries_per_4g)
__set_bit(index, tbl->it_map);
}
if (!welcomed) {
printk(KERN_INFO "IOMMU table initialized, virtual merging %s\n",
novmerge ? "disabled" : "enabled");