mirror of
https://github.com/torvalds/linux.git
synced 2024-11-26 22:21:42 +00:00
Merge branch 'stable/for-linus-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb
Pull swiotlb updates from Konrad Rzeszutek Wilk: "Cleanups in the swiotlb code and extra debugfs knobs to help with the field diagnostics" * 'stable/for-linus-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb: swiotlb-xen: ensure we have a single callsite for xen_dma_map_page swiotlb-xen: simplify the DMA sync method implementations swiotlb-xen: use ->map_page to implement ->map_sg swiotlb-xen: make instances match their method names swiotlb: save io_tlb_used to local variable before leaving critical section swiotlb: dump used and total slots when swiotlb buffer is full
This commit is contained in:
Linus Torvalds
commit
498e8631f2
@ -391,13 +391,8 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
|
||||
if (dma_capable(dev, dev_addr, size) &&
|
||||
!range_straddles_page_boundary(phys, size) &&
|
||||
!xen_arch_need_swiotlb(dev, phys, dev_addr) &&
|
||||
(swiotlb_force != SWIOTLB_FORCE)) {
|
||||
/* we are not interested in the dma_addr returned by
|
||||
* xen_dma_map_page, only in the potential cache flushes executed
|
||||
* by the function. */
|
||||
xen_dma_map_page(dev, page, dev_addr, offset, size, dir, attrs);
|
||||
return dev_addr;
|
||||
}
|
||||
swiotlb_force != SWIOTLB_FORCE)
|
||||
goto done;
|
||||
|
||||
/*
|
||||
* Oh well, have to allocate and map a bounce buffer.
|
||||
@ -410,19 +405,25 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
|
||||
return DMA_MAPPING_ERROR;
|
||||
|
||||
dev_addr = xen_phys_to_bus(map);
|
||||
xen_dma_map_page(dev, pfn_to_page(map >> PAGE_SHIFT),
|
||||
dev_addr, map & ~PAGE_MASK, size, dir, attrs);
|
||||
|
||||
/*
|
||||
* Ensure that the address returned is DMA'ble
|
||||
*/
|
||||
if (dma_capable(dev, dev_addr, size))
|
||||
return dev_addr;
|
||||
if (unlikely(!dma_capable(dev, dev_addr, size))) {
|
||||
swiotlb_tbl_unmap_single(dev, map, size, dir,
|
||||
attrs | DMA_ATTR_SKIP_CPU_SYNC);
|
||||
return DMA_MAPPING_ERROR;
|
||||
}
|
||||
|
||||
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
|
||||
swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
|
||||
|
||||
return DMA_MAPPING_ERROR;
|
||||
page = pfn_to_page(map >> PAGE_SHIFT);
|
||||
offset = map & ~PAGE_MASK;
|
||||
done:
|
||||
/*
|
||||
* we are not interested in the dma_addr returned by xen_dma_map_page,
|
||||
* only in the potential cache flushes executed by the function.
|
||||
*/
|
||||
xen_dma_map_page(dev, page, dev_addr, offset, size, dir, attrs);
|
||||
return dev_addr;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -455,48 +456,28 @@ static void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
|
||||
xen_unmap_single(hwdev, dev_addr, size, dir, attrs);
|
||||
}
|
||||
|
||||
/*
|
||||
* Make physical memory consistent for a single streaming mode DMA translation
|
||||
* after a transfer.
|
||||
*
|
||||
* If you perform a xen_swiotlb_map_page() but wish to interrogate the buffer
|
||||
* using the cpu, yet do not wish to teardown the dma mapping, you must
|
||||
* call this function before doing so. At the next point you give the dma
|
||||
* address back to the card, you must first perform a
|
||||
* xen_swiotlb_dma_sync_for_device, and then the device again owns the buffer
|
||||
*/
|
||||
static void
|
||||
xen_swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
|
||||
size_t size, enum dma_data_direction dir,
|
||||
enum dma_sync_target target)
|
||||
xen_swiotlb_sync_single_for_cpu(struct device *dev, dma_addr_t dma_addr,
|
||||
size_t size, enum dma_data_direction dir)
|
||||
{
|
||||
phys_addr_t paddr = xen_bus_to_phys(dev_addr);
|
||||
phys_addr_t paddr = xen_bus_to_phys(dma_addr);
|
||||
|
||||
BUG_ON(dir == DMA_NONE);
|
||||
xen_dma_sync_single_for_cpu(dev, dma_addr, size, dir);
|
||||
|
||||
if (target == SYNC_FOR_CPU)
|
||||
xen_dma_sync_single_for_cpu(hwdev, dev_addr, size, dir);
|
||||
|
||||
/* NOTE: We use dev_addr here, not paddr! */
|
||||
if (is_xen_swiotlb_buffer(dev_addr))
|
||||
swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
|
||||
|
||||
if (target == SYNC_FOR_DEVICE)
|
||||
xen_dma_sync_single_for_device(hwdev, dev_addr, size, dir);
|
||||
if (is_xen_swiotlb_buffer(dma_addr))
|
||||
swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU);
|
||||
}
|
||||
|
||||
void
|
||||
xen_swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
|
||||
size_t size, enum dma_data_direction dir)
|
||||
static void
|
||||
xen_swiotlb_sync_single_for_device(struct device *dev, dma_addr_t dma_addr,
|
||||
size_t size, enum dma_data_direction dir)
|
||||
{
|
||||
xen_swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
|
||||
}
|
||||
phys_addr_t paddr = xen_bus_to_phys(dma_addr);
|
||||
|
||||
void
|
||||
xen_swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
|
||||
size_t size, enum dma_data_direction dir)
|
||||
{
|
||||
xen_swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
|
||||
if (is_xen_swiotlb_buffer(dma_addr))
|
||||
swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE);
|
||||
|
||||
xen_dma_sync_single_for_device(dev, dma_addr, size, dir);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -504,9 +485,8 @@ xen_swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
|
||||
* concerning calls here are the same as for swiotlb_unmap_page() above.
|
||||
*/
|
||||
static void
|
||||
xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
|
||||
int nelems, enum dma_data_direction dir,
|
||||
unsigned long attrs)
|
||||
xen_swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
|
||||
enum dma_data_direction dir, unsigned long attrs)
|
||||
{
|
||||
struct scatterlist *sg;
|
||||
int i;
|
||||
@ -518,26 +498,9 @@ xen_swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* Map a set of buffers described by scatterlist in streaming mode for DMA.
|
||||
* This is the scatter-gather version of the above xen_swiotlb_map_page
|
||||
* interface. Here the scatter gather list elements are each tagged with the
|
||||
* appropriate dma address and length. They are obtained via
|
||||
* sg_dma_{address,length}(SG).
|
||||
*
|
||||
* NOTE: An implementation may be able to use a smaller number of
|
||||
* DMA address/length pairs than there are SG table elements.
|
||||
* (for example via virtual mapping capabilities)
|
||||
* The routine returns the number of addr/length pairs actually
|
||||
* used, at most nents.
|
||||
*
|
||||
* Device ownership issues as mentioned above for xen_swiotlb_map_page are the
|
||||
* same here.
|
||||
*/
|
||||
static int
|
||||
xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
|
||||
int nelems, enum dma_data_direction dir,
|
||||
unsigned long attrs)
|
||||
xen_swiotlb_map_sg(struct device *dev, struct scatterlist *sgl, int nelems,
|
||||
enum dma_data_direction dir, unsigned long attrs)
|
||||
{
|
||||
struct scatterlist *sg;
|
||||
int i;
|
||||
@ -545,85 +508,44 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
|
||||
BUG_ON(dir == DMA_NONE);
|
||||
|
||||
for_each_sg(sgl, sg, nelems, i) {
|
||||
phys_addr_t paddr = sg_phys(sg);
|
||||
dma_addr_t dev_addr = xen_phys_to_bus(paddr);
|
||||
|
||||
if (swiotlb_force == SWIOTLB_FORCE ||
|
||||
xen_arch_need_swiotlb(hwdev, paddr, dev_addr) ||
|
||||
!dma_capable(hwdev, dev_addr, sg->length) ||
|
||||
range_straddles_page_boundary(paddr, sg->length)) {
|
||||
phys_addr_t map = swiotlb_tbl_map_single(hwdev,
|
||||
start_dma_addr,
|
||||
sg_phys(sg),
|
||||
sg->length,
|
||||
dir, attrs);
|
||||
if (map == DMA_MAPPING_ERROR) {
|
||||
dev_warn(hwdev, "swiotlb buffer is full\n");
|
||||
/* Don't panic here, we expect map_sg users
|
||||
to do proper error handling. */
|
||||
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
|
||||
xen_swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
|
||||
attrs);
|
||||
sg_dma_len(sgl) = 0;
|
||||
return 0;
|
||||
}
|
||||
dev_addr = xen_phys_to_bus(map);
|
||||
xen_dma_map_page(hwdev, pfn_to_page(map >> PAGE_SHIFT),
|
||||
dev_addr,
|
||||
map & ~PAGE_MASK,
|
||||
sg->length,
|
||||
dir,
|
||||
attrs);
|
||||
sg->dma_address = dev_addr;
|
||||
} else {
|
||||
/* we are not interested in the dma_addr returned by
|
||||
* xen_dma_map_page, only in the potential cache flushes executed
|
||||
* by the function. */
|
||||
xen_dma_map_page(hwdev, pfn_to_page(paddr >> PAGE_SHIFT),
|
||||
dev_addr,
|
||||
paddr & ~PAGE_MASK,
|
||||
sg->length,
|
||||
dir,
|
||||
attrs);
|
||||
sg->dma_address = dev_addr;
|
||||
}
|
||||
sg->dma_address = xen_swiotlb_map_page(dev, sg_page(sg),
|
||||
sg->offset, sg->length, dir, attrs);
|
||||
if (sg->dma_address == DMA_MAPPING_ERROR)
|
||||
goto out_unmap;
|
||||
sg_dma_len(sg) = sg->length;
|
||||
}
|
||||
|
||||
return nelems;
|
||||
out_unmap:
|
||||
xen_swiotlb_unmap_sg(dev, sgl, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC);
|
||||
sg_dma_len(sgl) = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Make physical memory consistent for a set of streaming mode DMA translations
|
||||
* after a transfer.
|
||||
*
|
||||
* The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
|
||||
* and usage.
|
||||
*/
|
||||
static void
|
||||
xen_swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
|
||||
int nelems, enum dma_data_direction dir,
|
||||
enum dma_sync_target target)
|
||||
xen_swiotlb_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl,
|
||||
int nelems, enum dma_data_direction dir)
|
||||
{
|
||||
struct scatterlist *sg;
|
||||
int i;
|
||||
|
||||
for_each_sg(sgl, sg, nelems, i)
|
||||
xen_swiotlb_sync_single(hwdev, sg->dma_address,
|
||||
sg_dma_len(sg), dir, target);
|
||||
for_each_sg(sgl, sg, nelems, i) {
|
||||
xen_swiotlb_sync_single_for_cpu(dev, sg->dma_address,
|
||||
sg->length, dir);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
xen_swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
|
||||
int nelems, enum dma_data_direction dir)
|
||||
{
|
||||
xen_swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
|
||||
}
|
||||
|
||||
static void
|
||||
xen_swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
|
||||
xen_swiotlb_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
|
||||
int nelems, enum dma_data_direction dir)
|
||||
{
|
||||
xen_swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
|
||||
struct scatterlist *sg;
|
||||
int i;
|
||||
|
||||
for_each_sg(sgl, sg, nelems, i) {
|
||||
xen_swiotlb_sync_single_for_device(dev, sg->dma_address,
|
||||
sg->length, dir);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
@ -690,8 +612,8 @@ const struct dma_map_ops xen_swiotlb_dma_ops = {
|
||||
.sync_single_for_device = xen_swiotlb_sync_single_for_device,
|
||||
.sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
|
||||
.sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
|
||||
.map_sg = xen_swiotlb_map_sg_attrs,
|
||||
.unmap_sg = xen_swiotlb_unmap_sg_attrs,
|
||||
.map_sg = xen_swiotlb_map_sg,
|
||||
.unmap_sg = xen_swiotlb_unmap_sg,
|
||||
.map_page = xen_swiotlb_map_page,
|
||||
.unmap_page = xen_swiotlb_unmap_page,
|
||||
.dma_supported = xen_swiotlb_dma_supported,
|
||||
|
||||
@ -452,6 +452,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
|
||||
unsigned long mask;
|
||||
unsigned long offset_slots;
|
||||
unsigned long max_slots;
|
||||
unsigned long tmp_io_tlb_used;
|
||||
|
||||
if (no_iotlb_memory)
|
||||
panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
|
||||
@ -538,9 +539,12 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
|
||||
} while (index != wrap);
|
||||
|
||||
not_found:
|
||||
tmp_io_tlb_used = io_tlb_used;
|
||||
|
||||
spin_unlock_irqrestore(&io_tlb_lock, flags);
|
||||
if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
|
||||
dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
|
||||
dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n",
|
||||
size, io_tlb_nslabs, tmp_io_tlb_used);
|
||||
return DMA_MAPPING_ERROR;
|
||||
found:
|
||||
io_tlb_used += nslots;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user