aboutsummaryrefslogtreecommitdiff
path: root/lib/swiotlb.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/swiotlb.c')
-rw-r--r--lib/swiotlb.c97
1 files changed, 64 insertions, 33 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index bfe02b8fc55..4abda074ea4 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -38,6 +38,9 @@
#include <linux/bootmem.h>
#include <linux/iommu-helper.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/swiotlb.h>
+
#define OFFSET(val,align) ((unsigned long) \
( (val) & ( (align) - 1)))
@@ -83,6 +86,7 @@ static unsigned int io_tlb_index;
* We need to save away the original address corresponding to a mapped entry
* for the sync operations.
*/
+#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
static phys_addr_t *io_tlb_orig_addr;
/*
@@ -105,9 +109,9 @@ setup_io_tlb_npages(char *str)
if (!strcmp(str, "force"))
swiotlb_force = 1;
- return 1;
+ return 0;
}
-__setup("swiotlb=", setup_io_tlb_npages);
+early_param("swiotlb", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */
unsigned long swiotlb_nr_tbl(void)
@@ -115,6 +119,18 @@ unsigned long swiotlb_nr_tbl(void)
return io_tlb_nslabs;
}
EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
+
+/* default to 64MB */
+#define IO_TLB_DEFAULT_SIZE (64UL<<20)
+unsigned long swiotlb_size_or_default(void)
+{
+ unsigned long size;
+
+ size = io_tlb_nslabs << IO_TLB_SHIFT;
+
+ return size ? size : (IO_TLB_DEFAULT_SIZE);
+}
+
/* Note that this doesn't work with highmem page */
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
volatile void *address)
@@ -157,8 +173,9 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
/*
* Get the overflow emergency buffer
*/
- v_overflow_buffer = alloc_bootmem_low_pages_nopanic(
- PAGE_ALIGN(io_tlb_overflow));
+ v_overflow_buffer = memblock_virt_alloc_low_nopanic(
+ PAGE_ALIGN(io_tlb_overflow),
+ PAGE_SIZE);
if (!v_overflow_buffer)
return -ENOMEM;
@@ -169,11 +186,17 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
* to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
* between io_tlb_start and io_tlb_end.
*/
- io_tlb_list = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
- for (i = 0; i < io_tlb_nslabs; i++)
- io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ io_tlb_list = memblock_virt_alloc(
+ PAGE_ALIGN(io_tlb_nslabs * sizeof(int)),
+ PAGE_SIZE);
+ io_tlb_orig_addr = memblock_virt_alloc(
+ PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)),
+ PAGE_SIZE);
+ for (i = 0; i < io_tlb_nslabs; i++) {
+ io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
+ }
io_tlb_index = 0;
- io_tlb_orig_addr = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
if (verbose)
swiotlb_print_info();
@@ -188,8 +211,7 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
void __init
swiotlb_init(int verbose)
{
- /* default to 64MB */
- size_t default_size = 64UL<<20;
+ size_t default_size = IO_TLB_DEFAULT_SIZE;
unsigned char *vstart;
unsigned long bytes;
@@ -201,13 +223,13 @@ swiotlb_init(int verbose)
bytes = io_tlb_nslabs << IO_TLB_SHIFT;
/* Get IO TLB memory from the low pages */
- vstart = alloc_bootmem_low_pages_nopanic(PAGE_ALIGN(bytes));
+ vstart = memblock_virt_alloc_low_nopanic(PAGE_ALIGN(bytes), PAGE_SIZE);
if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose))
return;
if (io_tlb_start)
- free_bootmem(io_tlb_start,
- PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
+ memblock_free_early(io_tlb_start,
+ PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
pr_warn("Cannot allocate SWIOTLB buffer");
no_iotlb_memory = true;
}
@@ -294,10 +316,6 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
if (!io_tlb_list)
goto cleanup3;
- for (i = 0; i < io_tlb_nslabs; i++)
- io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
- io_tlb_index = 0;
-
io_tlb_orig_addr = (phys_addr_t *)
__get_free_pages(GFP_KERNEL,
get_order(io_tlb_nslabs *
@@ -305,7 +323,11 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
if (!io_tlb_orig_addr)
goto cleanup4;
- memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t));
+ for (i = 0; i < io_tlb_nslabs; i++) {
+ io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
+ }
+ io_tlb_index = 0;
swiotlb_print_info();
@@ -343,19 +365,19 @@ void __init swiotlb_free(void)
free_pages((unsigned long)phys_to_virt(io_tlb_start),
get_order(io_tlb_nslabs << IO_TLB_SHIFT));
} else {
- free_bootmem_late(io_tlb_overflow_buffer,
- PAGE_ALIGN(io_tlb_overflow));
- free_bootmem_late(__pa(io_tlb_orig_addr),
- PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
- free_bootmem_late(__pa(io_tlb_list),
- PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
- free_bootmem_late(io_tlb_start,
- PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
+ memblock_free_late(io_tlb_overflow_buffer,
+ PAGE_ALIGN(io_tlb_overflow));
+ memblock_free_late(__pa(io_tlb_orig_addr),
+ PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
+ memblock_free_late(__pa(io_tlb_list),
+ PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
+ memblock_free_late(io_tlb_start,
+ PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
}
io_tlb_nslabs = 0;
}
-static int is_swiotlb_buffer(phys_addr_t paddr)
+int is_swiotlb_buffer(phys_addr_t paddr)
{
return paddr >= io_tlb_start && paddr < io_tlb_end;
}
@@ -491,6 +513,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
not_found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
+ if (printk_ratelimit())
+ dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
return SWIOTLB_MAP_ERROR;
found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
@@ -535,7 +559,8 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
/*
* First, sync the memory before unmapping the entry
*/
- if (orig_addr && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
+ if (orig_addr != INVALID_PHYS_ADDR &&
+ ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE);
/*
@@ -552,8 +577,10 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* Step 1: return the slots to the free list, merging the
* slots with superceeding slots
*/
- for (i = index + nslots - 1; i >= index; i--)
+ for (i = index + nslots - 1; i >= index; i--) {
io_tlb_list[i] = ++count;
+ io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
+ }
/*
* Step 2: merge the returned slots with the preceding slots,
* if available (non zero)
@@ -572,6 +599,8 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
phys_addr_t orig_addr = io_tlb_orig_addr[index];
+ if (orig_addr == INVALID_PHYS_ADDR)
+ return;
orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
switch (target) {
@@ -715,6 +744,8 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
return dev_addr;
+ trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
+
/* Oh well, have to allocate and map a bounce buffer. */
map = map_single(dev, phys, size, dir);
if (map == SWIOTLB_MAP_ERROR) {
@@ -859,13 +890,13 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
swiotlb_full(hwdev, sg->length, dir, 0);
swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
attrs);
- sgl[0].dma_length = 0;
+ sg_dma_len(sgl) = 0;
return 0;
}
sg->dma_address = phys_to_dma(hwdev, map);
} else
sg->dma_address = dev_addr;
- sg->dma_length = sg->length;
+ sg_dma_len(sg) = sg->length;
}
return nelems;
}
@@ -893,7 +924,7 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
BUG_ON(dir == DMA_NONE);
for_each_sg(sgl, sg, nelems, i)
- unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
+ unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir);
}
EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
@@ -923,7 +954,7 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
for_each_sg(sgl, sg, nelems, i)
swiotlb_sync_single(hwdev, sg->dma_address,
- sg->dma_length, dir, target);
+ sg_dma_len(sg), dir, target);
}
void
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 11:49:31 +0000