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swiotlb: dynamically allocate io_tlb_default_mem

Browse source 
Instead of allocating ->list and ->orig_addr separately just do one
dynamic allocation for the actual io_tlb_mem structure.  This simplifies
a lot of the initialization code, and also allows to just check
io_tlb_default_mem to see if swiotlb is in use.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Christoph Hellwig 2021-03-18 17:14:23 +01:00 committed by Konrad Rzeszutek Wilk
parent 73f620951b
commit 2d29960af0
3 changed files with 116 additions and 228 deletions
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22
drivers/xen/swiotlb-xen.c
View file

@ -158,17 +158,14 @@ static const char *xen_swiotlb_error(enum xen_swiotlb_err err)
int __ref xen_swiotlb_init(void)
{
enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN;
unsigned long nslabs, bytes, order;
unsigned int repeat = 3;
unsigned long bytes = swiotlb_size_or_default();
unsigned long nslabs = bytes >> IO_TLB_SHIFT;
unsigned int order, repeat = 3;
int rc = -ENOMEM;
char *start;
nslabs = swiotlb_nr_tbl();
if (!nslabs)
nslabs = DEFAULT_NSLABS;
retry:
m_ret = XEN_SWIOTLB_ENOMEM;
bytes = nslabs << IO_TLB_SHIFT;
order = get_order(bytes);
/*
@ -221,19 +218,16 @@ int __ref xen_swiotlb_init(void)
#ifdef CONFIG_X86
void __init xen_swiotlb_init_early(void)
{
unsigned long nslabs, bytes;
unsigned long bytes = swiotlb_size_or_default();
unsigned long nslabs = bytes >> IO_TLB_SHIFT;
unsigned int repeat = 3;
char *start;
int rc;
nslabs = swiotlb_nr_tbl();
if (!nslabs)
nslabs = DEFAULT_NSLABS;
retry:
/*
* Get IO TLB memory from any location.
*/
bytes = nslabs << IO_TLB_SHIFT;
start = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE);
if (!start)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
@ -248,8 +242,8 @@ void __init xen_swiotlb_init_early(void)
if (repeat--) {
/* Min is 2MB */
nslabs = max(1024UL, (nslabs >> 1));
pr_info("Lowering to %luMB\n",
(nslabs << IO_TLB_SHIFT) >> 20);
bytes = nslabs << IO_TLB_SHIFT;
pr_info("Lowering to %luMB\n", bytes >> 20);
goto retry;
}
panic("%s (rc:%d)", xen_swiotlb_error(XEN_SWIOTLB_EFIXUP), rc);
@ -548,7 +542,7 @@ xen_swiotlb_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
static int
xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
return xen_phys_to_dma(hwdev, io_tlb_default_mem.end - 1) <= mask;
return xen_phys_to_dma(hwdev, io_tlb_default_mem->end - 1) <= mask;
}
const struct dma_map_ops xen_swiotlb_dma_ops = {

18
include/linux/swiotlb.h
View file

@ -90,28 +90,30 @@ struct io_tlb_mem {
phys_addr_t end;
unsigned long nslabs;
unsigned long used;
unsigned int *list;
unsigned int index;
phys_addr_t *orig_addr;
size_t *alloc_size;
spinlock_t lock;
struct dentry *debugfs;
bool late_alloc;
struct io_tlb_slot {
phys_addr_t orig_addr;
size_t alloc_size;
unsigned int list;
} slots[];
};
extern struct io_tlb_mem io_tlb_default_mem;
extern struct io_tlb_mem *io_tlb_default_mem;
static inline bool is_swiotlb_buffer(phys_addr_t paddr)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
struct io_tlb_mem *mem = io_tlb_default_mem;
return paddr >= mem->start && paddr < mem->end;
return mem && paddr >= mem->start && paddr < mem->end;
}
void __init swiotlb_exit(void);
unsigned int swiotlb_max_segment(void);
size_t swiotlb_max_mapping_size(struct device *dev);
bool is_swiotlb_active(void);
void __init swiotlb_adjust_size(unsigned long new_size);
void __init swiotlb_adjust_size(unsigned long size);
#else
#define swiotlb_force SWIOTLB_NO_FORCE
static inline bool is_swiotlb_buffer(phys_addr_t paddr)
@ -135,7 +137,7 @@ static inline bool is_swiotlb_active(void)
return false;
}
static inline void swiotlb_adjust_size(unsigned long new_size)
static inline void swiotlb_adjust_size(unsigned long size)
{
}
#endif /* CONFIG_SWIOTLB */

304
kernel/dma/swiotlb.c
View file

@ -63,7 +63,7 @@
enum swiotlb_force swiotlb_force;
struct io_tlb_mem io_tlb_default_mem;
struct io_tlb_mem *io_tlb_default_mem;
/*
* Max segment that we can provide which (if pages are contingous) will
@ -71,15 +71,15 @@ struct io_tlb_mem io_tlb_default_mem;
*/
static unsigned int max_segment;
static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
static int __init
setup_io_tlb_npages(char *str)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
if (isdigit(*str)) {
mem->nslabs = simple_strtoul(str, &str, 0);
/* avoid tail segment of size < IO_TLB_SEGSIZE */
mem->nslabs = ALIGN(mem->nslabs, IO_TLB_SEGSIZE);
default_nslabs =
ALIGN(simple_strtoul(str, &str, 0), IO_TLB_SEGSIZE);
}
if (*str == ',')
++str;
@ -87,24 +87,22 @@ setup_io_tlb_npages(char *str)
swiotlb_force = SWIOTLB_FORCE;
} else if (!strcmp(str, "noforce")) {
swiotlb_force = SWIOTLB_NO_FORCE;
mem->nslabs = 1;
default_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_default_mem.nslabs;
return io_tlb_default_mem ? io_tlb_default_mem->nslabs : 0;
}
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);
@ -118,44 +116,32 @@ void swiotlb_set_max_segment(unsigned int val)
unsigned long swiotlb_size_or_default(void)
{
unsigned long size;
size = io_tlb_default_mem.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)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
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 (!mem->nslabs) {
size = ALIGN(new_size, IO_TLB_SIZE);
mem->nslabs = size >> IO_TLB_SHIFT;
mem->nslabs = ALIGN(mem->nslabs, IO_TLB_SEGSIZE);
pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20);
}
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)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long bytes = mem->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", &mem->start, &mem->end,
bytes >> 20);
(mem->nslabs << IO_TLB_SHIFT) >> 20);
}
static inline unsigned long io_tlb_offset(unsigned long val)
@ -176,13 +162,12 @@ static inline unsigned long nr_slots(u64 val)
*/
void __init swiotlb_update_mem_attributes(void)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
struct io_tlb_mem *mem = io_tlb_default_mem;
void *vaddr;
unsigned long bytes;
if (no_iotlb_memory || mem->late_alloc)
if (!mem || mem->late_alloc)
return;
vaddr = phys_to_virt(mem->start);
bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
@ -191,55 +176,33 @@ void __init swiotlb_update_mem_attributes(void)
int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long i, bytes;
unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
struct io_tlb_mem *mem;
size_t alloc_size;
/* protect against double initialization */
if (WARN_ON_ONCE(mem->start))
if (WARN_ON_ONCE(io_tlb_default_mem))
return -ENOMEM;
bytes = nslabs << IO_TLB_SHIFT;
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);
mem->nslabs = nslabs;
mem->start = __pa(tlb);
mem->end = mem->start + bytes;
mem->index = 0;
spin_lock_init(&mem->lock);
/*
* 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 mem->start and mem->end.
*/
alloc_size = PAGE_ALIGN(mem->nslabs * sizeof(int));
mem->list = memblock_alloc(alloc_size, PAGE_SIZE);
if (!mem->list)
panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
__func__, alloc_size, PAGE_SIZE);
alloc_size = PAGE_ALIGN(mem->nslabs * sizeof(phys_addr_t));
mem->orig_addr = memblock_alloc(alloc_size, PAGE_SIZE);
if (!mem->orig_addr)
panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
__func__, alloc_size, PAGE_SIZE);
alloc_size = PAGE_ALIGN(mem->nslabs * sizeof(size_t));
mem->alloc_size = memblock_alloc(alloc_size, PAGE_SIZE);
if (mem->alloc_size)
panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
__func__, alloc_size, PAGE_SIZE);
for (i = 0; i < mem->nslabs; i++) {
mem->list[i] = IO_TLB_SEGSIZE - io_tlb_offset(i);
mem->orig_addr[i] = INVALID_PHYS_ADDR;
mem->alloc_size[i] = 0;
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;
}
no_iotlb_memory = false;
io_tlb_default_mem = mem;
if (verbose)
swiotlb_print_info();
swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
}
@ -251,30 +214,21 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
void __init
swiotlb_init(int verbose)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
size_t default_size = IO_TLB_DEFAULT_SIZE;
unsigned char *vstart;
unsigned long bytes;
if (!mem->nslabs) {
mem->nslabs = (default_size >> IO_TLB_SHIFT);
mem->nslabs = ALIGN(mem->nslabs, IO_TLB_SEGSIZE);
}
bytes = mem->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, mem->nslabs, verbose))
return;
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;
if (mem->start) {
memblock_free_early(mem->start,
PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT));
mem->start = 0;
}
fail_free_mem:
memblock_free_early(__pa(tlb), bytes);
fail:
pr_warn("Cannot allocate buffer");
no_iotlb_memory = true;
}
/*
@ -285,23 +239,19 @@ swiotlb_init(int verbose)
int
swiotlb_late_init_with_default_size(size_t default_size)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long bytes, req_nslabs = mem->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 (!mem->nslabs) {
mem->nslabs = (default_size >> IO_TLB_SHIFT);
mem->nslabs = ALIGN(mem->nslabs, IO_TLB_SEGSIZE);
}
/*
* Get IO TLB memory from the low pages
*/
order = get_order(mem->nslabs << IO_TLB_SHIFT);
mem->nslabs = SLABS_PER_PAGE << order;
bytes = mem->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,
@ -311,43 +261,35 @@ swiotlb_late_init_with_default_size(size_t default_size)
order--;
}
if (!vstart) {
mem->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);
mem->nslabs = SLABS_PER_PAGE << order;
nslabs = SLABS_PER_PAGE << order;
}
rc = swiotlb_late_init_with_tbl(vstart, mem->nslabs);
rc = swiotlb_late_init_with_tbl(vstart, nslabs);
if (rc)
free_pages((unsigned long)vstart, order);
return rc;
}
static void swiotlb_cleanup(void)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
mem->end = 0;
mem->start = 0;
mem->nslabs = 0;
max_segment = 0;
}
int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long i, bytes;
unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
struct io_tlb_mem *mem;
/* protect against double initialization */
if (WARN_ON_ONCE(mem->start))
if (WARN_ON_ONCE(io_tlb_default_mem))
return -ENOMEM;
bytes = nslabs << IO_TLB_SHIFT;
mem = (void *)__get_free_pages(GFP_KERNEL,
get_order(struct_size(mem, slots, nslabs)));
if (!mem)
return -ENOMEM;
mem->nslabs = nslabs;
mem->start = virt_to_phys(tlb);
@ -355,84 +297,35 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
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;
}
set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
memset(tlb, 0, 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 mem->start and mem->end.
*/
mem->list = (unsigned int *)__get_free_pages(GFP_KERNEL,
get_order(mem->nslabs * sizeof(int)));
if (!mem->list)
goto cleanup3;
mem->orig_addr = (phys_addr_t *)
__get_free_pages(GFP_KERNEL,
get_order(mem->nslabs *
sizeof(phys_addr_t)));
if (!mem->orig_addr)
goto cleanup4;
mem->alloc_size = (size_t *)
__get_free_pages(GFP_KERNEL,
get_order(mem->nslabs *
sizeof(size_t)));
if (!mem->alloc_size)
goto cleanup5;
for (i = 0; i < mem->nslabs; i++) {
mem->list[i] = IO_TLB_SEGSIZE - io_tlb_offset(i);
mem->orig_addr[i] = INVALID_PHYS_ADDR;
mem->alloc_size[i] = 0;
}
no_iotlb_memory = false;
io_tlb_default_mem = mem;
swiotlb_print_info();
swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
cleanup5:
free_pages((unsigned long)mem->orig_addr,
get_order(mem->nslabs * sizeof(phys_addr_t)));
cleanup4:
free_pages((unsigned long)mem->list,
get_order(mem->nslabs * sizeof(int)));
mem->list = NULL;
cleanup3:
swiotlb_cleanup();
return -ENOMEM;
}
void __init swiotlb_exit(void)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
struct io_tlb_mem *mem = io_tlb_default_mem;
size_t size;
if (!mem->orig_addr)
if (!mem)
return;
if (mem->late_alloc) {
free_pages((unsigned long)mem->alloc_size,
get_order(mem->nslabs * sizeof(size_t)));
free_pages((unsigned long)mem->orig_addr,
get_order(mem->nslabs * sizeof(phys_addr_t)));
free_pages((unsigned long)mem->list,
get_order(mem->nslabs * sizeof(int)));
free_pages((unsigned long)phys_to_virt(mem->start),
get_order(mem->nslabs << IO_TLB_SHIFT));
} else {
memblock_free_late(__pa(mem->alloc_size),
PAGE_ALIGN(mem->nslabs * sizeof(size_t)));
memblock_free_late(__pa(mem->orig_addr),
PAGE_ALIGN(mem->nslabs * sizeof(phys_addr_t)));
memblock_free_late(__pa(mem->list),
PAGE_ALIGN(mem->nslabs * sizeof(int)));
memblock_free_late(mem->start,
PAGE_ALIGN(mem->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;
}
/*
@ -441,10 +334,10 @@ void __init swiotlb_exit(void)
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;
struct io_tlb_mem *mem = io_tlb_default_mem;
int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
phys_addr_t orig_addr = mem->orig_addr[index];
size_t alloc_size = mem->alloc_size[index];
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);
@ -523,7 +416,7 @@ static unsigned int wrap_index(struct io_tlb_mem *mem, 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;
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, mem->start) & boundary_mask;
@ -565,7 +458,7 @@ 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 (mem->list[index] >= nslots)
if (mem->slots[index].list >= nslots)
goto found;
}
index = wrap_index(mem, index + stride);
@ -577,11 +470,11 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr,
found:
for (i = index; i < index + nslots; i++)
mem->list[i] = 0;
mem->slots[i].list = 0;
for (i = index - 1;
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
mem->list[i]; i--)
mem->list[i] = ++count;
mem->slots[i].list; i--)
mem->slots[i].list = ++count;
/*
* Update the indices to avoid searching in the next round.
@ -600,12 +493,12 @@ 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;
struct io_tlb_mem *mem = io_tlb_default_mem;
unsigned int offset = swiotlb_align_offset(dev, orig_addr);
unsigned int index, i;
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())
@ -632,8 +525,9 @@ 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++) {
mem->orig_addr[index + i] = slot_addr(orig_addr, i);
mem->alloc_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(mem->start, index) + offset;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
@ -649,11 +543,11 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
size_t mapping_size, enum dma_data_direction dir,
unsigned long attrs)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
struct io_tlb_mem *mem = io_tlb_default_mem;
unsigned long flags;
unsigned int offset = swiotlb_align_offset(hwdev, tlb_addr);
int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;
int nslots = nr_slots(mem->alloc_size[index] + offset);
int nslots = nr_slots(mem->slots[index].alloc_size + offset);
int count, i;
/*
@ -671,7 +565,7 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
*/
spin_lock_irqsave(&mem->lock, flags);
if (index + nslots < ALIGN(index + 1, IO_TLB_SEGSIZE))
count = mem->list[index + nslots];
count = mem->slots[index + nslots].list;
else
count = 0;
@ -680,9 +574,9 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* superceeding slots
*/
for (i = index + nslots - 1; i >= index; i--) {
mem->list[i] = ++count;
mem->orig_addr[i] = INVALID_PHYS_ADDR;
mem->alloc_size[i] = 0;
mem->slots[i].list = ++count;
mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
mem->slots[i].alloc_size = 0;
}
/*
@ -690,9 +584,9 @@ 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 && mem->list[i];
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 && mem->slots[i].list;
i--)
mem->list[i] = ++count;
mem->slots[i].list = ++count;
mem->used -= nslots;
spin_unlock_irqrestore(&mem->lock, flags);
}
@ -756,19 +650,17 @@ size_t swiotlb_max_mapping_size(struct device *dev)
bool is_swiotlb_active(void)
{
/*
* When SWIOTLB is initialized, even if mem->start points to physical
* address zero, mem->end surely doesn't.
*/
return io_tlb_default_mem.end != 0;
return io_tlb_default_mem != NULL;
}
#ifdef CONFIG_DEBUG_FS
static int __init swiotlb_create_debugfs(void)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
struct io_tlb_mem *mem = io_tlb_default_mem;
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);