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authorKristoffer Glembo <kristoffer@gaisler.com>2011-04-28 22:17:00 +0000
committerDavid S. Miller <davem@davemloft.net>2011-05-16 13:41:40 -0700
commitd81f087f1f1c1aacdb4f17224a554237285ddd11 (patch)
tree8be22ee127abee5e493a3ed427f0d94fb5bb7f6e /arch/sparc/kernel
parentfb1fece5da027d3c7e69cf44ca8e58aaf0faf520 (diff)
downloadlinux-d81f087f1f1c1aacdb4f17224a554237285ddd11.tar.bz2
sparc32,leon: Remove unnecessary page_address calls in LEON DMA API.
The function mmu_inval_dma_area takes a virtual address as a parameter which is problematic in case the buffer is located in highmem and the mapping currently is unavailable. Since the function was only implemented for LEON this patch removes calls to it in non LEON code paths and renames it to dma_make_coherent which instead takes a physical address (which for now is unused since we flush the whole cache). This way it is possible to remove several unnecessary calls to page_address which will fail if the virtual mapping is unavailable. Signed-off-by: Kristoffer Glembo <kristoffer@gaisler.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel')
-rw-r--r--arch/sparc/kernel/ioport.c42
1 files changed, 16 insertions, 26 deletions
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index c6ce9a6a4790..1c9c80a1a86a 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -50,10 +50,15 @@
#include <asm/io-unit.h>
#include <asm/leon.h>
+/* This function must make sure that caches and memory are coherent after DMA
+ * On LEON systems without cache snooping it flushes the entire D-CACHE.
+ */
#ifndef CONFIG_SPARC_LEON
-#define mmu_inval_dma_area(p, l) /* Anton pulled it out for 2.4.0-xx */
+static inline void dma_make_coherent(unsigned long pa, unsigned long len)
+{
+}
#else
-static inline void mmu_inval_dma_area(void *va, unsigned long len)
+static inline void dma_make_coherent(unsigned long pa, unsigned long len)
{
if (!sparc_leon3_snooping_enabled())
leon_flush_dcache_all();
@@ -284,7 +289,6 @@ static void *sbus_alloc_coherent(struct device *dev, size_t len,
printk("sbus_alloc_consistent: cannot occupy 0x%lx", len_total);
goto err_nova;
}
- mmu_inval_dma_area((void *)va, len_total);
// XXX The mmu_map_dma_area does this for us below, see comments.
// sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
@@ -336,7 +340,6 @@ static void sbus_free_coherent(struct device *dev, size_t n, void *p,
release_resource(res);
kfree(res);
- /* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */
pgv = virt_to_page(p);
mmu_unmap_dma_area(dev, ba, n);
@@ -463,7 +466,6 @@ static void *pci32_alloc_coherent(struct device *dev, size_t len,
printk("pci_alloc_consistent: cannot occupy 0x%lx", len_total);
goto err_nova;
}
- mmu_inval_dma_area(va, len_total);
sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
*pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
@@ -489,7 +491,6 @@ static void pci32_free_coherent(struct device *dev, size_t n, void *p,
dma_addr_t ba)
{
struct resource *res;
- void *pgp;
if ((res = _sparc_find_resource(&_sparc_dvma,
(unsigned long)p)) == NULL) {
@@ -509,14 +510,12 @@ static void pci32_free_coherent(struct device *dev, size_t n, void *p,
return;
}
- pgp = phys_to_virt(ba); /* bus_to_virt actually */
- mmu_inval_dma_area(pgp, n);
+ dma_make_coherent(ba, n);
sparc_unmapiorange((unsigned long)p, n);
release_resource(res);
kfree(res);
-
- free_pages((unsigned long)pgp, get_order(n));
+ free_pages((unsigned long)phys_to_virt(ba), get_order(n));
}
/*
@@ -535,7 +534,7 @@ static void pci32_unmap_page(struct device *dev, dma_addr_t ba, size_t size,
enum dma_data_direction dir, struct dma_attrs *attrs)
{
if (dir != PCI_DMA_TODEVICE)
- mmu_inval_dma_area(phys_to_virt(ba), PAGE_ALIGN(size));
+ dma_make_coherent(ba, PAGE_ALIGN(size));
}
/* Map a set of buffers described by scatterlist in streaming
@@ -562,8 +561,7 @@ static int pci32_map_sg(struct device *device, struct scatterlist *sgl,
/* IIep is write-through, not flushing. */
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- sg->dma_address = virt_to_phys(sg_virt(sg));
+ sg->dma_address = sg_phys(sg);
sg->dma_length = sg->length;
}
return nents;
@@ -582,9 +580,7 @@ static void pci32_unmap_sg(struct device *dev, struct scatterlist *sgl,
if (dir != PCI_DMA_TODEVICE) {
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- mmu_inval_dma_area(page_address(sg_page(sg)),
- PAGE_ALIGN(sg->length));
+ dma_make_coherent(sg_phys(sg), PAGE_ALIGN(sg->length));
}
}
}
@@ -603,8 +599,7 @@ static void pci32_sync_single_for_cpu(struct device *dev, dma_addr_t ba,
size_t size, enum dma_data_direction dir)
{
if (dir != PCI_DMA_TODEVICE) {
- mmu_inval_dma_area(phys_to_virt(ba),
- PAGE_ALIGN(size));
+ dma_make_coherent(ba, PAGE_ALIGN(size));
}
}
@@ -612,8 +607,7 @@ static void pci32_sync_single_for_device(struct device *dev, dma_addr_t ba,
size_t size, enum dma_data_direction dir)
{
if (dir != PCI_DMA_TODEVICE) {
- mmu_inval_dma_area(phys_to_virt(ba),
- PAGE_ALIGN(size));
+ dma_make_coherent(ba, PAGE_ALIGN(size));
}
}
@@ -631,9 +625,7 @@ static void pci32_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
if (dir != PCI_DMA_TODEVICE) {
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- mmu_inval_dma_area(page_address(sg_page(sg)),
- PAGE_ALIGN(sg->length));
+ dma_make_coherent(sg_phys(sg), PAGE_ALIGN(sg->length));
}
}
}
@@ -646,9 +638,7 @@ static void pci32_sync_sg_for_device(struct device *device, struct scatterlist *
if (dir != PCI_DMA_TODEVICE) {
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- mmu_inval_dma_area(page_address(sg_page(sg)),
- PAGE_ALIGN(sg->length));
+ dma_make_coherent(sg_phys(sg), PAGE_ALIGN(sg->length));
}
}
}