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Message-Id: <472ba94d2e2313c8bda5.1226603403@abulafia.goop.org>
Date: Thu, 13 Nov 2008 11:10:03 -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>
Subject: [PATCH 05 of 38] swiotlb: allow architectures to override
virt<->bus<->virt conversions
From: Ian Campbell <ian.campbell@...rix.com>
Architectures may need to override these conversions. Implement a
__weak hook point containing the default implementation.
Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
include/linux/swiotlb.h | 3 +++
lib/swiotlb.c | 42 ++++++++++++++++++++++++++----------------
2 files changed, 29 insertions(+), 16 deletions(-)
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -27,6 +27,9 @@
extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs);
extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
+extern unsigned long __weak swiotlb_virt_to_bus(volatile void *address);
+extern void * __weak swiotlb_bus_to_virt(unsigned long address);
+
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
@@ -125,6 +125,16 @@
return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
}
+unsigned long __weak swiotlb_virt_to_bus(volatile void *address)
+{
+ return virt_to_bus(address);
+}
+
+void * __weak swiotlb_bus_to_virt(unsigned long address)
+{
+ return bus_to_virt(address);
+}
+
/*
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
@@ -168,7 +178,7 @@
panic("Cannot allocate SWIOTLB overflow buffer!\n");
printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n",
- virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end));
+ swiotlb_virt_to_bus(io_tlb_start), swiotlb_virt_to_bus(io_tlb_end));
}
void __init
@@ -250,7 +260,7 @@
printk(KERN_INFO "Placing %luMB software IO TLB between 0x%lx - "
"0x%lx\n", bytes >> 20,
- virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end));
+ swiotlb_virt_to_bus(io_tlb_start), swiotlb_virt_to_bus(io_tlb_end));
return 0;
@@ -298,7 +308,7 @@
unsigned long max_slots;
mask = dma_get_seg_boundary(hwdev);
- start_dma_addr = virt_to_bus(io_tlb_start) & mask;
+ start_dma_addr = swiotlb_virt_to_bus(io_tlb_start) & mask;
offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
max_slots = mask + 1
@@ -467,7 +477,7 @@
int order = get_order(size);
ret = (void *)__get_free_pages(flags, order);
- if (ret && address_needs_mapping(hwdev, virt_to_bus(ret), size)) {
+ if (ret && address_needs_mapping(hwdev, swiotlb_virt_to_bus(ret), size)) {
/*
* The allocated memory isn't reachable by the device.
* Fall back on swiotlb_map_single().
@@ -488,7 +498,7 @@
}
memset(ret, 0, size);
- dev_addr = virt_to_bus(ret);
+ dev_addr = swiotlb_virt_to_bus(ret);
/* Confirm address can be DMA'd by device */
if (address_needs_mapping(hwdev, dev_addr, size)) {
@@ -548,7 +558,7 @@
swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size,
int dir, struct dma_attrs *attrs)
{
- dma_addr_t dev_addr = virt_to_bus(ptr);
+ dma_addr_t dev_addr = swiotlb_virt_to_bus(ptr);
void *map;
BUG_ON(dir == DMA_NONE);
@@ -569,7 +579,7 @@
map = io_tlb_overflow_buffer;
}
- dev_addr = virt_to_bus(map);
+ dev_addr = swiotlb_virt_to_bus(map);
/*
* Ensure that the address returned is DMA'ble
@@ -599,7 +609,7 @@
swiotlb_unmap_single_attrs(struct device *hwdev, dma_addr_t dev_addr,
size_t size, int dir, struct dma_attrs *attrs)
{
- char *dma_addr = bus_to_virt(dev_addr);
+ char *dma_addr = swiotlb_bus_to_virt(dev_addr);
BUG_ON(dir == DMA_NONE);
if (is_swiotlb_buffer(dma_addr))
@@ -629,7 +639,7 @@
swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
size_t size, int dir, int target)
{
- char *dma_addr = bus_to_virt(dev_addr);
+ char *dma_addr = swiotlb_bus_to_virt(dev_addr);
BUG_ON(dir == DMA_NONE);
if (is_swiotlb_buffer(dma_addr))
@@ -660,7 +670,7 @@
unsigned long offset, size_t size,
int dir, int target)
{
- char *dma_addr = bus_to_virt(dev_addr) + offset;
+ char *dma_addr = swiotlb_bus_to_virt(dev_addr) + offset;
BUG_ON(dir == DMA_NONE);
if (is_swiotlb_buffer(dma_addr))
@@ -716,7 +726,7 @@
for_each_sg(sgl, sg, nelems, i) {
addr = SG_ENT_VIRT_ADDRESS(sg);
- dev_addr = virt_to_bus(addr);
+ dev_addr = swiotlb_virt_to_bus(addr);
if (swiotlb_force ||
address_needs_mapping(hwdev, dev_addr, sg->length)) {
void *map = map_single(hwdev, addr, sg->length, dir);
@@ -729,7 +739,7 @@
sgl[0].dma_length = 0;
return 0;
}
- sg->dma_address = virt_to_bus(map);
+ sg->dma_address = swiotlb_virt_to_bus(map);
} else
sg->dma_address = dev_addr;
sg->dma_length = sg->length;
@@ -760,7 +770,7 @@
for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
- unmap_single(hwdev, bus_to_virt(sg->dma_address),
+ unmap_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
sg->dma_length, dir);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
@@ -793,7 +803,7 @@
for_each_sg(sgl, sg, nelems, i) {
if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg))
- sync_single(hwdev, bus_to_virt(sg->dma_address),
+ sync_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
sg->dma_length, dir, target);
else if (dir == DMA_FROM_DEVICE)
dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length);
@@ -817,7 +827,7 @@
int
swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
{
- return (dma_addr == virt_to_bus(io_tlb_overflow_buffer));
+ return (dma_addr == swiotlb_virt_to_bus(io_tlb_overflow_buffer));
}
/*
@@ -829,7 +839,7 @@
int
swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
- return virt_to_bus(io_tlb_end - 1) <= mask;
+ return swiotlb_virt_to_bus(io_tlb_end - 1) <= mask;
}
EXPORT_SYMBOL(swiotlb_map_single);
--
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