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authorLinus Torvalds <torvalds@linux-foundation.org>2021-05-04 10:58:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-05-04 10:58:49 -0700
commit74d6790cdaaf3825afe53e668b32e662ad5e2e12 (patch)
tree1838c987f3f8e3e794ecb97a12da2c779beeaf47 /kernel/dma
parent954b7207059cc4004f2e18f49c335304b1c6d64a (diff)
parentdfc06b389a4f54e78c03abecd5b42ab6ea8d492a (diff)
Merge branch 'stable/for-linus-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb
Pull swiotlb updates from Konrad Rzeszutek Wilk: "Christoph Hellwig has taken a cleaver and trimmed off the not-needed code and nicely folded duplicate code in the generic framework. This lays the groundwork for more work to add extra DMA-backend-ish in the future. Along with that some bug-fixes to make this a nice working package" * 'stable/for-linus-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb: swiotlb: don't override user specified size in swiotlb_adjust_size swiotlb: Fix the type of index swiotlb: Make SWIOTLB_NO_FORCE perform no allocation ARM: Qualify enabling of swiotlb_init() swiotlb: remove swiotlb_nr_tbl swiotlb: dynamically allocate io_tlb_default_mem swiotlb: move global variables into a new io_tlb_mem structure xen-swiotlb: remove the unused size argument from xen_swiotlb_fixup xen-swiotlb: split xen_swiotlb_init swiotlb: lift the double initialization protection from xen-swiotlb xen-swiotlb: remove xen_io_tlb_start and xen_io_tlb_nslabs xen-swiotlb: remove xen_set_nslabs xen-swiotlb: use io_tlb_end in xen_swiotlb_dma_supported xen-swiotlb: use is_swiotlb_buffer in is_xen_swiotlb_buffer swiotlb: split swiotlb_tbl_sync_single swiotlb: move orig addr and size validation into swiotlb_bounce swiotlb: remove the alloc_size parameter to swiotlb_tbl_unmap_single powerpc/svm: stop using io_tlb_start
Diffstat (limited to 'kernel/dma')
-rw-r--r--kernel/dma/direct.c8
-rw-r--r--kernel/dma/direct.h6
-rw-r--r--kernel/dma/swiotlb.c520
3 files changed, 200 insertions, 334 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 002268262c9a..f737e3347059 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -344,8 +344,8 @@ void dma_direct_sync_sg_for_device(struct device *dev,
phys_addr_t paddr = dma_to_phys(dev, sg_dma_address(sg));
if (unlikely(is_swiotlb_buffer(paddr)))
- swiotlb_tbl_sync_single(dev, paddr, sg->length,
- dir, SYNC_FOR_DEVICE);
+ swiotlb_sync_single_for_device(dev, paddr, sg->length,
+ dir);
if (!dev_is_dma_coherent(dev))
arch_sync_dma_for_device(paddr, sg->length,
@@ -370,8 +370,8 @@ void dma_direct_sync_sg_for_cpu(struct device *dev,
arch_sync_dma_for_cpu(paddr, sg->length, dir);
if (unlikely(is_swiotlb_buffer(paddr)))
- swiotlb_tbl_sync_single(dev, paddr, sg->length, dir,
- SYNC_FOR_CPU);
+ swiotlb_sync_single_for_cpu(dev, paddr, sg->length,
+ dir);
if (dir == DMA_FROM_DEVICE)
arch_dma_mark_clean(paddr, sg->length);
diff --git a/kernel/dma/direct.h b/kernel/dma/direct.h
index b98615578737..50afc05b6f1d 100644
--- a/kernel/dma/direct.h
+++ b/kernel/dma/direct.h
@@ -57,7 +57,7 @@ static inline void dma_direct_sync_single_for_device(struct device *dev,
phys_addr_t paddr = dma_to_phys(dev, addr);
if (unlikely(is_swiotlb_buffer(paddr)))
- swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE);
+ swiotlb_sync_single_for_device(dev, paddr, size, dir);
if (!dev_is_dma_coherent(dev))
arch_sync_dma_for_device(paddr, size, dir);
@@ -74,7 +74,7 @@ static inline void dma_direct_sync_single_for_cpu(struct device *dev,
}
if (unlikely(is_swiotlb_buffer(paddr)))
- swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU);
+ swiotlb_sync_single_for_cpu(dev, paddr, size, dir);
if (dir == DMA_FROM_DEVICE)
arch_dma_mark_clean(paddr, size);
@@ -114,6 +114,6 @@ static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
dma_direct_sync_single_for_cpu(dev, addr, size, dir);
if (unlikely(is_swiotlb_buffer(phys)))
- swiotlb_tbl_unmap_single(dev, phys, size, size, dir, attrs);
+ swiotlb_tbl_unmap_single(dev, phys, size, dir, attrs);
}
#endif /* _KERNEL_DMA_DIRECT_H */
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index c10e855a03bc..8ca7d505d61c 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -59,32 +59,11 @@
*/
#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
-enum swiotlb_force swiotlb_force;
-
-/*
- * Used to do a quick range check in swiotlb_tbl_unmap_single and
- * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
- * API.
- */
-phys_addr_t io_tlb_start, io_tlb_end;
-
-/*
- * The number of IO TLB blocks (in groups of 64) between io_tlb_start and
- * io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
- */
-static unsigned long io_tlb_nslabs;
+#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
-/*
- * The number of used IO TLB block
- */
-static unsigned long io_tlb_used;
+enum swiotlb_force swiotlb_force;
-/*
- * This is a free list describing the number of free entries available from
- * each index
- */
-static unsigned int *io_tlb_list;
-static unsigned int io_tlb_index;
+struct io_tlb_mem *io_tlb_default_mem;
/*
* Max segment that we can provide which (if pages are contingous) will
@@ -92,57 +71,30 @@ static unsigned int io_tlb_index;
*/
static unsigned int max_segment;
-/*
- * 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;
-
-/*
- * The mapped buffer's size should be validated during a sync operation.
- */
-static size_t *io_tlb_orig_size;
-
-/*
- * Protect the above data structures in the map and unmap calls
- */
-static DEFINE_SPINLOCK(io_tlb_lock);
-
-static int late_alloc;
+static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
static int __init
setup_io_tlb_npages(char *str)
{
if (isdigit(*str)) {
- io_tlb_nslabs = simple_strtoul(str, &str, 0);
/* avoid tail segment of size < IO_TLB_SEGSIZE */
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ default_nslabs =
+ ALIGN(simple_strtoul(str, &str, 0), IO_TLB_SEGSIZE);
}
if (*str == ',')
++str;
- if (!strcmp(str, "force")) {
+ if (!strcmp(str, "force"))
swiotlb_force = SWIOTLB_FORCE;
- } else if (!strcmp(str, "noforce")) {
+ else if (!strcmp(str, "noforce"))
swiotlb_force = SWIOTLB_NO_FORCE;
- io_tlb_nslabs = 1;
- }
return 0;
}
early_param("swiotlb", setup_io_tlb_npages);
-static bool no_iotlb_memory;
-
-unsigned long swiotlb_nr_tbl(void)
-{
- return unlikely(no_iotlb_memory) ? 0 : io_tlb_nslabs;
-}
-EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
-
unsigned int swiotlb_max_segment(void)
{
- return unlikely(no_iotlb_memory) ? 0 : max_segment;
+ return io_tlb_default_mem ? max_segment : 0;
}
EXPORT_SYMBOL_GPL(swiotlb_max_segment);
@@ -156,42 +108,34 @@ void swiotlb_set_max_segment(unsigned int val)
unsigned long swiotlb_size_or_default(void)
{
- unsigned long size;
-
- size = io_tlb_nslabs << IO_TLB_SHIFT;
-
- return size ? size : (IO_TLB_DEFAULT_SIZE);
+ return default_nslabs << IO_TLB_SHIFT;
}
-void __init swiotlb_adjust_size(unsigned long new_size)
+void __init swiotlb_adjust_size(unsigned long size)
{
- unsigned long size;
-
/*
* If swiotlb parameter has not been specified, give a chance to
* architectures such as those supporting memory encryption to
* adjust/expand SWIOTLB size for their use.
*/
- if (!io_tlb_nslabs) {
- size = ALIGN(new_size, IO_TLB_SIZE);
- io_tlb_nslabs = size >> IO_TLB_SHIFT;
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
-
- pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20);
- }
+ if (default_nslabs != IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT)
+ return;
+ size = ALIGN(size, IO_TLB_SIZE);
+ default_nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
+ pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20);
}
void swiotlb_print_info(void)
{
- unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+ struct io_tlb_mem *mem = io_tlb_default_mem;
- if (no_iotlb_memory) {
+ if (!mem) {
pr_warn("No low mem\n");
return;
}
- pr_info("mapped [mem %pa-%pa] (%luMB)\n", &io_tlb_start, &io_tlb_end,
- bytes >> 20);
+ pr_info("mapped [mem %pa-%pa] (%luMB)\n", &mem->start, &mem->end,
+ (mem->nslabs << IO_TLB_SHIFT) >> 20);
}
static inline unsigned long io_tlb_offset(unsigned long val)
@@ -212,64 +156,51 @@ static inline unsigned long nr_slots(u64 val)
*/
void __init swiotlb_update_mem_attributes(void)
{
+ struct io_tlb_mem *mem = io_tlb_default_mem;
void *vaddr;
unsigned long bytes;
- if (no_iotlb_memory || late_alloc)
+ if (!mem || mem->late_alloc)
return;
-
- vaddr = phys_to_virt(io_tlb_start);
- bytes = PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT);
+ vaddr = phys_to_virt(mem->start);
+ bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
memset(vaddr, 0, bytes);
}
int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
{
- unsigned long i, bytes;
+ unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
+ struct io_tlb_mem *mem;
size_t alloc_size;
- bytes = nslabs << IO_TLB_SHIFT;
-
- io_tlb_nslabs = nslabs;
- io_tlb_start = __pa(tlb);
- io_tlb_end = io_tlb_start + bytes;
-
- /*
- * Allocate and initialize the free list array. This array is used
- * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
- * between io_tlb_start and io_tlb_end.
- */
- alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(int));
- io_tlb_list = memblock_alloc(alloc_size, PAGE_SIZE);
- if (!io_tlb_list)
- panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
- __func__, alloc_size, PAGE_SIZE);
+ if (swiotlb_force == SWIOTLB_NO_FORCE)
+ return 0;
- alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t));
- io_tlb_orig_addr = memblock_alloc(alloc_size, PAGE_SIZE);
- if (!io_tlb_orig_addr)
- panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
- __func__, alloc_size, PAGE_SIZE);
+ /* protect against double initialization */
+ if (WARN_ON_ONCE(io_tlb_default_mem))
+ return -ENOMEM;
- alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(size_t));
- io_tlb_orig_size = memblock_alloc(alloc_size, PAGE_SIZE);
- if (!io_tlb_orig_size)
+ alloc_size = PAGE_ALIGN(struct_size(mem, slots, nslabs));
+ mem = memblock_alloc(alloc_size, PAGE_SIZE);
+ if (!mem)
panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
__func__, alloc_size, PAGE_SIZE);
-
- for (i = 0; i < io_tlb_nslabs; i++) {
- io_tlb_list[i] = IO_TLB_SEGSIZE - io_tlb_offset(i);
- io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
- io_tlb_orig_size[i] = 0;
+ mem->nslabs = nslabs;
+ mem->start = __pa(tlb);
+ mem->end = mem->start + bytes;
+ mem->index = 0;
+ spin_lock_init(&mem->lock);
+ for (i = 0; i < mem->nslabs; i++) {
+ mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
+ mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
+ mem->slots[i].alloc_size = 0;
}
- io_tlb_index = 0;
- no_iotlb_memory = false;
+ io_tlb_default_mem = mem;
if (verbose)
swiotlb_print_info();
-
- swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
+ swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
}
@@ -280,29 +211,24 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
void __init
swiotlb_init(int verbose)
{
- size_t default_size = IO_TLB_DEFAULT_SIZE;
- unsigned char *vstart;
- unsigned long bytes;
-
- if (!io_tlb_nslabs) {
- io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
- }
-
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+ size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
+ void *tlb;
- /* Get IO TLB memory from the low pages */
- vstart = memblock_alloc_low(PAGE_ALIGN(bytes), PAGE_SIZE);
- if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose))
+ if (swiotlb_force == SWIOTLB_NO_FORCE)
return;
- if (io_tlb_start) {
- memblock_free_early(io_tlb_start,
- PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
- io_tlb_start = 0;
- }
+ /* Get IO TLB memory from the low pages */
+ tlb = memblock_alloc_low(bytes, PAGE_SIZE);
+ if (!tlb)
+ goto fail;
+ if (swiotlb_init_with_tbl(tlb, default_nslabs, verbose))
+ goto fail_free_mem;
+ return;
+
+fail_free_mem:
+ memblock_free_early(__pa(tlb), bytes);
+fail:
pr_warn("Cannot allocate buffer");
- no_iotlb_memory = true;
}
/*
@@ -313,22 +239,22 @@ swiotlb_init(int verbose)
int
swiotlb_late_init_with_default_size(size_t default_size)
{
- unsigned long bytes, req_nslabs = io_tlb_nslabs;
+ unsigned long nslabs =
+ ALIGN(default_size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
+ unsigned long bytes;
unsigned char *vstart = NULL;
unsigned int order;
int rc = 0;
- if (!io_tlb_nslabs) {
- io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
- }
+ if (swiotlb_force == SWIOTLB_NO_FORCE)
+ return 0;
/*
* Get IO TLB memory from the low pages
*/
- order = get_order(io_tlb_nslabs << IO_TLB_SHIFT);
- io_tlb_nslabs = SLABS_PER_PAGE << order;
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+ order = get_order(nslabs << IO_TLB_SHIFT);
+ nslabs = SLABS_PER_PAGE << order;
+ bytes = nslabs << IO_TLB_SHIFT;
while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
@@ -338,134 +264,99 @@ swiotlb_late_init_with_default_size(size_t default_size)
order--;
}
- if (!vstart) {
- io_tlb_nslabs = req_nslabs;
+ if (!vstart)
return -ENOMEM;
- }
+
if (order != get_order(bytes)) {
pr_warn("only able to allocate %ld MB\n",
(PAGE_SIZE << order) >> 20);
- io_tlb_nslabs = SLABS_PER_PAGE << order;
+ nslabs = SLABS_PER_PAGE << order;
}
- rc = swiotlb_late_init_with_tbl(vstart, io_tlb_nslabs);
+ rc = swiotlb_late_init_with_tbl(vstart, nslabs);
if (rc)
free_pages((unsigned long)vstart, order);
return rc;
}
-static void swiotlb_cleanup(void)
-{
- io_tlb_end = 0;
- io_tlb_start = 0;
- io_tlb_nslabs = 0;
- max_segment = 0;
-}
-
int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
- unsigned long i, bytes;
+ unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
+ struct io_tlb_mem *mem;
- bytes = nslabs << IO_TLB_SHIFT;
+ if (swiotlb_force == SWIOTLB_NO_FORCE)
+ return 0;
- io_tlb_nslabs = nslabs;
- io_tlb_start = virt_to_phys(tlb);
- io_tlb_end = io_tlb_start + bytes;
+ /* protect against double initialization */
+ if (WARN_ON_ONCE(io_tlb_default_mem))
+ return -ENOMEM;
- set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
- memset(tlb, 0, bytes);
+ mem = (void *)__get_free_pages(GFP_KERNEL,
+ get_order(struct_size(mem, slots, nslabs)));
+ if (!mem)
+ return -ENOMEM;
- /*
- * Allocate and initialize the free list array. This array is used
- * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
- * between io_tlb_start and io_tlb_end.
- */
- io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs * sizeof(int)));
- if (!io_tlb_list)
- goto cleanup3;
-
- io_tlb_orig_addr = (phys_addr_t *)
- __get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs *
- sizeof(phys_addr_t)));
- if (!io_tlb_orig_addr)
- goto cleanup4;
-
- io_tlb_orig_size = (size_t *)
- __get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs *
- sizeof(size_t)));
- if (!io_tlb_orig_size)
- goto cleanup5;
-
-
- for (i = 0; i < io_tlb_nslabs; i++) {
- io_tlb_list[i] = IO_TLB_SEGSIZE - io_tlb_offset(i);
- io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
- io_tlb_orig_size[i] = 0;
+ mem->nslabs = nslabs;
+ mem->start = virt_to_phys(tlb);
+ mem->end = mem->start + bytes;
+ mem->index = 0;
+ mem->late_alloc = 1;
+ spin_lock_init(&mem->lock);
+ for (i = 0; i < mem->nslabs; i++) {
+ mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
+ mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
+ mem->slots[i].alloc_size = 0;
}
- io_tlb_index = 0;
- no_iotlb_memory = false;
-
- swiotlb_print_info();
- late_alloc = 1;
-
- swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
+ set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
+ memset(tlb, 0, bytes);
+ io_tlb_default_mem = mem;
+ swiotlb_print_info();
+ swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
-
-cleanup5:
- free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs *
- sizeof(phys_addr_t)));
-
-cleanup4:
- free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
- sizeof(int)));
- io_tlb_list = NULL;
-cleanup3:
- swiotlb_cleanup();
- return -ENOMEM;
}
void __init swiotlb_exit(void)
{
- if (!io_tlb_orig_addr)
+ struct io_tlb_mem *mem = io_tlb_default_mem;
+ size_t size;
+
+ if (!mem)
return;
- if (late_alloc) {
- free_pages((unsigned long)io_tlb_orig_size,
- get_order(io_tlb_nslabs * sizeof(size_t)));
- free_pages((unsigned long)io_tlb_orig_addr,
- get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
- free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
- sizeof(int)));
- free_pages((unsigned long)phys_to_virt(io_tlb_start),
- get_order(io_tlb_nslabs << IO_TLB_SHIFT));
- } else {
- memblock_free_late(__pa(io_tlb_orig_addr),
- PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
- memblock_free_late(__pa(io_tlb_orig_size),
- PAGE_ALIGN(io_tlb_nslabs * sizeof(size_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));
- }
- swiotlb_cleanup();
+ size = struct_size(mem, slots, mem->nslabs);
+ if (mem->late_alloc)
+ free_pages((unsigned long)mem, get_order(size));
+ else
+ memblock_free_late(__pa(mem), PAGE_ALIGN(size));
+ io_tlb_default_mem = NULL;
}
/*
* Bounce: copy the swiotlb buffer from or back to the original dma location
*/
-static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
- size_t size, enum dma_data_direction dir)
+static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size,
+ enum dma_data_direction dir)
{
+ struct io_tlb_mem *mem = io_tlb_default_mem;
+ int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
+ phys_addr_t orig_addr = mem->slots[index].orig_addr;
+ size_t alloc_size = mem->slots[index].alloc_size;
unsigned long pfn = PFN_DOWN(orig_addr);
unsigned char *vaddr = phys_to_virt(tlb_addr);
+ if (orig_addr == INVALID_PHYS_ADDR)
+ return;
+
+ if (size > alloc_size) {
+ dev_WARN_ONCE(dev, 1,
+ "Buffer overflow detected. Allocation size: %zu. Mapping size: %zu.\n",
+ alloc_size, size);
+ size = alloc_size;
+ }
+
if (PageHighMem(pfn_to_page(pfn))) {
/* The buffer does not have a mapping. Map it in and copy */
unsigned int offset = orig_addr & ~PAGE_MASK;
@@ -517,9 +408,9 @@ static inline unsigned long get_max_slots(unsigned long boundary_mask)
return nr_slots(boundary_mask + 1);
}
-static unsigned int wrap_index(unsigned int index)
+static unsigned int wrap_index(struct io_tlb_mem *mem, unsigned int index)
{
- if (index >= io_tlb_nslabs)
+ if (index >= mem->nslabs)
return 0;
return index;
}
@@ -531,9 +422,10 @@ static unsigned int wrap_index(unsigned int index)
static int find_slots(struct device *dev, phys_addr_t orig_addr,
size_t alloc_size)
{
+ struct io_tlb_mem *mem = io_tlb_default_mem;
unsigned long boundary_mask = dma_get_seg_boundary(dev);
dma_addr_t tbl_dma_addr =
- phys_to_dma_unencrypted(dev, io_tlb_start) & boundary_mask;
+ phys_to_dma_unencrypted(dev, mem->start) & boundary_mask;
unsigned long max_slots = get_max_slots(boundary_mask);
unsigned int iotlb_align_mask =
dma_get_min_align_mask(dev) & ~(IO_TLB_SIZE - 1);
@@ -552,15 +444,15 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr,
if (alloc_size >= PAGE_SIZE)
stride = max(stride, stride << (PAGE_SHIFT - IO_TLB_SHIFT));
- spin_lock_irqsave(&io_tlb_lock, flags);
- if (unlikely(nslots > io_tlb_nslabs - io_tlb_used))
+ spin_lock_irqsave(&mem->lock, flags);
+ if (unlikely(nslots > mem->nslabs - mem->used))
goto not_found;
- index = wrap = wrap_index(ALIGN(io_tlb_index, stride));
+ index = wrap = wrap_index(mem, ALIGN(mem->index, stride));
do {
if ((slot_addr(tbl_dma_addr, index) & iotlb_align_mask) !=
(orig_addr & iotlb_align_mask)) {
- index = wrap_index(index + 1);
+ index = wrap_index(mem, index + 1);
continue;
}
@@ -572,34 +464,34 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr,
if (!iommu_is_span_boundary(index, nslots,
nr_slots(tbl_dma_addr),
max_slots)) {
- if (io_tlb_list[index] >= nslots)
+ if (mem->slots[index].list >= nslots)
goto found;
}
- index = wrap_index(index + stride);
+ index = wrap_index(mem, index + stride);
} while (index != wrap);
not_found:
- spin_unlock_irqrestore(&io_tlb_lock, flags);
+ spin_unlock_irqrestore(&mem->lock, flags);
return -1;
found:
for (i = index; i < index + nslots; i++)
- io_tlb_list[i] = 0;
+ mem->slots[i].list = 0;
for (i = index - 1;
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
- io_tlb_list[i]; i--)
- io_tlb_list[i] = ++count;
+ mem->slots[i].list; i--)
+ mem->slots[i].list = ++count;
/*
* Update the indices to avoid searching in the next round.
*/
- if (index + nslots < io_tlb_nslabs)
- io_tlb_index = index + nslots;
+ if (index + nslots < mem->nslabs)
+ mem->index = index + nslots;
else
- io_tlb_index = 0;
- io_tlb_used += nslots;
+ mem->index = 0;
+ mem->used += nslots;
- spin_unlock_irqrestore(&io_tlb_lock, flags);
+ spin_unlock_irqrestore(&mem->lock, flags);
return index;
}
@@ -607,11 +499,13 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
size_t mapping_size, size_t alloc_size,
enum dma_data_direction dir, unsigned long attrs)
{
+ struct io_tlb_mem *mem = io_tlb_default_mem;
unsigned int offset = swiotlb_align_offset(dev, orig_addr);
- unsigned int index, i;
+ unsigned int i;
+ int index;
phys_addr_t tlb_addr;
- if (no_iotlb_memory)
+ if (!mem)
panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
if (mem_encrypt_active())
@@ -628,7 +522,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
if (!(attrs & DMA_ATTR_NO_WARN))
dev_warn_ratelimited(dev,
"swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n",
- alloc_size, io_tlb_nslabs, io_tlb_used);
+ alloc_size, mem->nslabs, mem->used);
return (phys_addr_t)DMA_MAPPING_ERROR;
}
@@ -638,49 +532,37 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
* needed.
*/
for (i = 0; i < nr_slots(alloc_size + offset); i++) {
- io_tlb_orig_addr[index + i] = slot_addr(orig_addr, i);
- io_tlb_orig_size[index+i] = alloc_size - (i << IO_TLB_SHIFT);
+ mem->slots[index + i].orig_addr = slot_addr(orig_addr, i);
+ mem->slots[index + i].alloc_size =
+ alloc_size - (i << IO_TLB_SHIFT);
}
- tlb_addr = slot_addr(io_tlb_start, index) + offset;
+ tlb_addr = slot_addr(mem->start, index) + offset;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(orig_addr, tlb_addr, mapping_size, DMA_TO_DEVICE);
+ swiotlb_bounce(dev, tlb_addr, mapping_size, DMA_TO_DEVICE);
return tlb_addr;
}
-static void validate_sync_size_and_truncate(struct device *hwdev, size_t orig_size, size_t *size)
-{
- if (*size > orig_size) {
- /* Warn and truncate mapping_size */
- dev_WARN_ONCE(hwdev, 1,
- "Attempt for buffer overflow. Original size: %zu. Mapping size: %zu.\n",
- orig_size, *size);
- *size = orig_size;
- }
-}
-
/*
* tlb_addr is the physical address of the bounce buffer to unmap.
*/
void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
- size_t mapping_size, size_t alloc_size,
- enum dma_data_direction dir, unsigned long attrs)
+ size_t mapping_size, enum dma_data_direction dir,
+ unsigned long attrs)
{
+ struct io_tlb_mem *mem = io_tlb_default_mem;
unsigned long flags;
unsigned int offset = swiotlb_align_offset(hwdev, tlb_addr);
- int i, count, nslots = nr_slots(alloc_size + offset);
- int index = (tlb_addr - offset - io_tlb_start) >> IO_TLB_SHIFT;
- phys_addr_t orig_addr = io_tlb_orig_addr[index];
-
- validate_sync_size_and_truncate(hwdev, io_tlb_orig_size[index], &mapping_size);
+ int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;
+ int nslots = nr_slots(mem->slots[index].alloc_size + offset);
+ int count, i;
/*
* First, sync the memory before unmapping the entry
*/
- if (orig_addr != INVALID_PHYS_ADDR &&
- !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
- ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
- swiotlb_bounce(orig_addr, tlb_addr, mapping_size, DMA_FROM_DEVICE);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
+ (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
+ swiotlb_bounce(hwdev, tlb_addr, mapping_size, DMA_FROM_DEVICE);
/*
* Return the buffer to the free list by setting the corresponding
@@ -688,9 +570,9 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* While returning the entries to the free list, we merge the entries
* with slots below and above the pool being returned.
*/
- spin_lock_irqsave(&io_tlb_lock, flags);
+ spin_lock_irqsave(&mem->lock, flags);
if (index + nslots < ALIGN(index + 1, IO_TLB_SEGSIZE))
- count = io_tlb_list[index + nslots];
+ count = mem->slots[index + nslots].list;
else
count = 0;
@@ -699,9 +581,9 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* superceeding slots
*/
for (i = index + nslots - 1; i >= index; i--) {
- io_tlb_list[i] = ++count;
- io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
- io_tlb_orig_size[i] = 0;
+ mem->slots[i].list = ++count;
+ mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
+ mem->slots[i].alloc_size = 0;
}
/*
@@ -709,44 +591,29 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* available (non zero)
*/
for (i = index - 1;
- io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 && io_tlb_list[i];
+ io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 && mem->slots[i].list;
i--)
- io_tlb_list[i] = ++count;
- io_tlb_used -= nslots;
- spin_unlock_irqrestore(&io_tlb_lock, flags);
+ mem->slots[i].list = ++count;
+ mem->used -= nslots;
+ spin_unlock_irqrestore(&mem->lock, flags);
}
-void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
- size_t size, enum dma_data_direction dir,
- enum dma_sync_target target)
+void swiotlb_sync_single_for_device(struct device *dev, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir)
{
- int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
- size_t orig_size = io_tlb_orig_size[index];
- phys_addr_t orig_addr = io_tlb_orig_addr[index];
-
- if (orig_addr == INVALID_PHYS_ADDR)
- return;
+ if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
+ swiotlb_bounce(dev, tlb_addr, size, DMA_TO_DEVICE);
+ else
+ BUG_ON(dir != DMA_FROM_DEVICE);
+}
- validate_sync_size_and_truncate(hwdev, orig_size, &size);
-
- switch (target) {
- case SYNC_FOR_CPU:
- if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(orig_addr, tlb_addr,
- size, DMA_FROM_DEVICE);
- else
- BUG_ON(dir != DMA_TO_DEVICE);
- break;
- case SYNC_FOR_DEVICE:
- if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(orig_addr, tlb_addr,
- size, DMA_TO_DEVICE);
- else
- BUG_ON(dir != DMA_FROM_DEVICE);
- break;
- default:
- BUG();
- }
+void swiotlb_sync_single_for_cpu(struct device *dev, phys_addr_t tlb_addr,
+ size_t size, enum dma_data_direction dir)
+{
+ if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
+ swiotlb_bounce(dev, tlb_addr, size, DMA_FROM_DEVICE);
+ else
+ BUG_ON(dir != DMA_TO_DEVICE);
}
/*
@@ -770,7 +637,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
/* Ensure that the address returned is DMA'ble */
dma_addr = phys_to_dma_unencrypted(dev, swiotlb_addr);
if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
- swiotlb_tbl_unmap_single(dev, swiotlb_addr, size, size, dir,
+ swiotlb_tbl_unmap_single(dev, swiotlb_addr, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
dev_WARN_ONCE(dev, 1,
"swiotlb addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
@@ -790,22 +657,21 @@ size_t swiotlb_max_mapping_size(struct device *dev)
bool is_swiotlb_active(void)
{
- /*
- * When SWIOTLB is initialized, even if io_tlb_start points to physical
- * address zero, io_tlb_end surely doesn't.
- */
- return io_tlb_end != 0;
+ return io_tlb_default_mem != NULL;
}
+EXPORT_SYMBOL_GPL(is_swiotlb_active);
#ifdef CONFIG_DEBUG_FS
static int __init swiotlb_create_debugfs(void)
{
- struct dentry *root;
+ struct io_tlb_mem *mem = io_tlb_default_mem;
- root = debugfs_create_dir("swiotlb", NULL);
- debugfs_create_ulong("io_tlb_nslabs", 0400, root, &io_tlb_nslabs);
- debugfs_create_ulong("io_tlb_used", 0400, root, &io_tlb_used);
+ if (!mem)
+ return 0;
+ mem->debugfs = debugfs_create_dir("swiotlb", NULL);
+ debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
+ debugfs_create_ulong("io_tlb_used", 0400, mem->debugfs, &mem->used);
return 0;
}