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Message-Id: <de816a2fdde6a5f940cd.1229458651@abulafia.goop.org>
Date: Tue, 16 Dec 2008 12:17:31 -0800
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org,
Xen-devel <xen-devel@...ts.xensource.com>,
the arch/x86 maintainers <x86@...nel.org>,
Ian Campbell <ian.campbell@...rix.com>,
Jan Beulich <jbeulich@...ell.com>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: [PATCH 07 of 14] swiotlb: add arch hook to force mapping
From: Ian Campbell <ian.campbell@...rix.com>
Some architectures require special rules to determine whether a range
needs mapping or not. This adds a weak function for architectures to
override.
Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
include/linux/swiotlb.h | 2 ++
lib/swiotlb.c | 15 +++++++++++++--
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -30,6 +30,8 @@
extern dma_addr_t swiotlb_phys_to_bus(phys_addr_t address);
extern phys_addr_t swiotlb_bus_to_phys(dma_addr_t address);
+extern int swiotlb_arch_range_needs_mapping(void *ptr, size_t size);
+
extern void
*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags);
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -145,6 +145,11 @@
return phys_to_virt(swiotlb_bus_to_phys(address));
}
+int __weak swiotlb_arch_range_needs_mapping(void *ptr, size_t size)
+{
+ return 0;
+}
+
/*
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
@@ -297,6 +302,11 @@
return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size);
}
+static inline int range_needs_mapping(void *ptr, size_t size)
+{
+ return swiotlb_force || swiotlb_arch_range_needs_mapping(ptr, size);
+}
+
static int is_swiotlb_buffer(char *addr)
{
return addr >= io_tlb_start && addr < io_tlb_end;
@@ -581,7 +591,8 @@
* we can safely return the device addr and not worry about bounce
* buffering it.
*/
- if (!address_needs_mapping(hwdev, dev_addr, size) && !swiotlb_force)
+ if (!address_needs_mapping(hwdev, dev_addr, size) &&
+ !range_needs_mapping(ptr, size))
return dev_addr;
/*
@@ -741,7 +752,7 @@
for_each_sg(sgl, sg, nelems, i) {
addr = SG_ENT_VIRT_ADDRESS(sg);
dev_addr = swiotlb_virt_to_bus(addr);
- if (swiotlb_force ||
+ if (range_needs_mapping(sg_virt(sg), sg->length) ||
address_needs_mapping(hwdev, dev_addr, sg->length)) {
void *map = map_single(hwdev, addr, sg->length, dir);
if (!map) {
--
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