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iommu sg: x86: convert gart IOMMU to use the IOMMU helper 

This patch converts gart IOMMU to use the IOMMU helper functions. The
IOMMU doesn't allocate a memory area spanning LLD's segment boundary
anymore.

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: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Muli Ben-Yehuda <mulix@mulix.org>
Cc: Andi Kleen <ak@suse.de>
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 22:28:11 -08:00 committed by Linus Torvalds
parent 1b39b07778
commit fde9a1094d
2 changed files with 26 additions and 17 deletions
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2
arch/x86/Kconfig
View File

@ -466,7 +466,7 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
If unsure, say Y.
config IOMMU_HELPER
def_bool CALGARY_IOMMU
def_bool (CALGARY_IOMMU || GART_IOMMU)
# need this always selected by IOMMU for the VIA workaround
config SWIOTLB

41
arch/x86/kernel/pci-gart_64.c
View File

@ -25,6 +25,7 @@
#include <linux/bitops.h>
#include <linux/kdebug.h>
#include <linux/scatterlist.h>
#include <linux/iommu-helper.h>
#include <asm/atomic.h>
#include <asm/io.h>
#include <asm/mtrr.h>
@ -82,17 +83,24 @@ AGPEXTERN __u32 *agp_gatt_table;
static unsigned long next_bit; /* protected by iommu_bitmap_lock */
static int need_flush; /* global flush state. set for each gart wrap */
static unsigned long alloc_iommu(int size)
static unsigned long alloc_iommu(struct device *dev, int size)
{
unsigned long offset, flags;
unsigned long boundary_size;
unsigned long base_index;
base_index = ALIGN(iommu_bus_base & dma_get_seg_boundary(dev),
PAGE_SIZE) >> PAGE_SHIFT;
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
PAGE_SIZE) >> PAGE_SHIFT;
spin_lock_irqsave(&iommu_bitmap_lock, flags);
offset = find_next_zero_string(iommu_gart_bitmap, next_bit,
iommu_pages, size);
offset = iommu_area_alloc(iommu_gart_bitmap, iommu_pages, next_bit,
size, base_index, boundary_size, 0);
if (offset == -1) {
need_flush = 1;
offset = find_next_zero_string(iommu_gart_bitmap, 0,
iommu_pages, size);
offset = iommu_area_alloc(iommu_gart_bitmap, iommu_pages, 0,
size, base_index, boundary_size, 0);
}
if (offset != -1) {
set_bit_string(iommu_gart_bitmap, offset, size);
@ -114,7 +122,7 @@ static void free_iommu(unsigned long offset, int size)
unsigned long flags;
spin_lock_irqsave(&iommu_bitmap_lock, flags);
__clear_bit_string(iommu_gart_bitmap, offset, size);
iommu_area_free(iommu_gart_bitmap, offset, size);
spin_unlock_irqrestore(&iommu_bitmap_lock, flags);
}
@ -235,7 +243,7 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem,
size_t size, int dir)
{
unsigned long npages = to_pages(phys_mem, size);
unsigned long iommu_page = alloc_iommu(npages);
unsigned long iommu_page = alloc_iommu(dev, npages);
int i;
if (iommu_page == -1) {
@ -355,10 +363,11 @@ static int dma_map_sg_nonforce(struct device *dev, struct scatterlist *sg,
}
/* Map multiple scatterlist entries continuous into the first. */
static int __dma_map_cont(struct scatterlist *start, int nelems,
struct scatterlist *sout, unsigned long pages)
static int __dma_map_cont(struct device *dev, struct scatterlist *start,
int nelems, struct scatterlist *sout,
unsigned long pages)
{
unsigned long iommu_start = alloc_iommu(pages);
unsigned long iommu_start = alloc_iommu(dev, pages);
unsigned long iommu_page = iommu_start;
struct scatterlist *s;
int i;
@ -394,8 +403,8 @@ static int __dma_map_cont(struct scatterlist *start, int nelems,
}
static inline int
dma_map_cont(struct scatterlist *start, int nelems, struct scatterlist *sout,
unsigned long pages, int need)
dma_map_cont(struct device *dev, struct scatterlist *start, int nelems,
struct scatterlist *sout, unsigned long pages, int need)
{
if (!need) {
BUG_ON(nelems != 1);
@ -403,7 +412,7 @@ dma_map_cont(struct scatterlist *start, int nelems, struct scatterlist *sout,
sout->dma_length = start->length;
return 0;
}
return __dma_map_cont(start, nelems, sout, pages);
return __dma_map_cont(dev, start, nelems, sout, pages);
}
/*
@ -449,8 +458,8 @@ gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
if (!iommu_merge || !nextneed || !need || s->offset ||
(s->length + seg_size > max_seg_size) ||
(ps->offset + ps->length) % PAGE_SIZE) {
if (dma_map_cont(start_sg, i - start, sgmap,
pages, need) < 0)
if (dma_map_cont(dev, start_sg, i - start,
sgmap, pages, need) < 0)
goto error;
out++;
seg_size = 0;
@ -466,7 +475,7 @@ gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
pages += to_pages(s->offset, s->length);
ps = s;
}
if (dma_map_cont(start_sg, i - start, sgmap, pages, need) < 0)
if (dma_map_cont(dev, start_sg, i - start, sgmap, pages, need) < 0)
goto error;
out++;
flush_gart();