[RFC PATCH v3 1/6] swiotlb: Add io_tlb_mem struct
From: Claire Chang
Date: Tue Jan 05 2021 - 22:42:37 EST
Added a new struct, io_tlb_mem, as the IO TLB memory pool descriptor and
moved relevant global variables into that struct.
This will be useful later to allow for restricted DMA pool.
Signed-off-by: Claire Chang <tientzu@xxxxxxxxxxxx>
---
arch/powerpc/platforms/pseries/svm.c | 4 +-
drivers/xen/swiotlb-xen.c | 4 +-
include/linux/swiotlb.h | 39 +++-
kernel/dma/swiotlb.c | 292 +++++++++++++--------------
4 files changed, 178 insertions(+), 161 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
index 7b739cc7a8a9..2b767f1ca5fd 100644
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c
@@ -55,8 +55,8 @@ void __init svm_swiotlb_init(void)
if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false))
return;
- if (io_tlb_start)
- memblock_free_early(io_tlb_start,
+ if (io_tlb_default_mem.start)
+ memblock_free_early(io_tlb_default_mem.start,
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
panic("SVM: Cannot allocate SWIOTLB buffer");
}
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 2b385c1b4a99..4d17dff7ffd2 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -192,8 +192,8 @@ int __ref xen_swiotlb_init(int verbose, bool early)
/*
* IO TLB memory already allocated. Just use it.
*/
- if (io_tlb_start != 0) {
- xen_io_tlb_start = phys_to_virt(io_tlb_start);
+ if (io_tlb_default_mem.start != 0) {
+ xen_io_tlb_start = phys_to_virt(io_tlb_default_mem.start);
goto end;
}
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index d9c9fc9ca5d2..dd8eb57cbb8f 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -70,11 +70,46 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
#ifdef CONFIG_SWIOTLB
extern enum swiotlb_force swiotlb_force;
-extern phys_addr_t io_tlb_start, io_tlb_end;
+
+/**
+ * struct io_tlb_mem - IO TLB Memory Pool Descriptor
+ *
+ * @start: The start address of the swiotlb memory pool. Used to do a quick
+ * range check to see if the memory was in fact allocated by this
+ * API.
+ * @end: The end address of the swiotlb memory pool. Used to do a quick
+ * range check to see if the memory was in fact allocated by this
+ * API.
+ * @nslabs: The number of IO TLB blocks (in groups of 64) between @start and
+ * @end. This is command line adjustable via setup_io_tlb_npages.
+ * @used: The number of used IO TLB block.
+ * @list: The free list describing the number of free entries available
+ * from each index.
+ * @index: The index to start searching in the next round.
+ * @orig_addr: The original address corresponding to a mapped entry for the
+ * sync operations.
+ * @lock: The lock to protect the above data structures in the map and
+ * unmap calls.
+ * @debugfs: The dentry to debugfs.
+ */
+struct io_tlb_mem {
+ phys_addr_t start;
+ phys_addr_t end;
+ unsigned long nslabs;
+ unsigned long used;
+ unsigned int *list;
+ unsigned int index;
+ phys_addr_t *orig_addr;
+ spinlock_t lock;
+ struct dentry *debugfs;
+};
+extern struct io_tlb_mem io_tlb_default_mem;
static inline bool is_swiotlb_buffer(phys_addr_t paddr)
{
- return paddr >= io_tlb_start && paddr < io_tlb_end;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+
+ return paddr >= mem->start && paddr < mem->end;
}
void __init swiotlb_exit(void);
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 7c42df6e6100..e4368159f88a 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -61,33 +61,11 @@
* allocate a contiguous 1MB, we're probably in trouble anyway.
*/
#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
+#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
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;
-
-/*
- * The number of used IO TLB block
- */
-static unsigned long io_tlb_used;
-
-/*
- * 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
@@ -95,27 +73,17 @@ 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;
-
-/*
- * Protect the above data structures in the map and unmap calls
- */
-static DEFINE_SPINLOCK(io_tlb_lock);
-
static int late_alloc;
static int __init
setup_io_tlb_npages(char *str)
{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+
if (isdigit(*str)) {
- io_tlb_nslabs = simple_strtoul(str, &str, 0);
+ mem->nslabs = simple_strtoul(str, &str, 0);
/* avoid tail segment of size < IO_TLB_SEGSIZE */
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ mem->nslabs = ALIGN(mem->nslabs, IO_TLB_SEGSIZE);
}
if (*str == ',')
++str;
@@ -123,7 +91,7 @@ setup_io_tlb_npages(char *str)
swiotlb_force = SWIOTLB_FORCE;
} else if (!strcmp(str, "noforce")) {
swiotlb_force = SWIOTLB_NO_FORCE;
- io_tlb_nslabs = 1;
+ mem->nslabs = 1;
}
return 0;
@@ -134,7 +102,7 @@ static bool no_iotlb_memory;
unsigned long swiotlb_nr_tbl(void)
{
- return unlikely(no_iotlb_memory) ? 0 : io_tlb_nslabs;
+ return unlikely(no_iotlb_memory) ? 0 : io_tlb_default_mem.nslabs;
}
EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
@@ -156,13 +124,14 @@ unsigned long swiotlb_size_or_default(void)
{
unsigned long size;
- size = io_tlb_nslabs << IO_TLB_SHIFT;
+ size = io_tlb_default_mem.nslabs << IO_TLB_SHIFT;
return size ? size : (IO_TLB_DEFAULT_SIZE);
}
void __init swiotlb_adjust_size(unsigned long new_size)
{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long size;
/*
@@ -170,10 +139,10 @@ void __init swiotlb_adjust_size(unsigned long new_size)
* architectures such as those supporting memory encryption to
* adjust/expand SWIOTLB size for their use.
*/
- if (!io_tlb_nslabs) {
+ if (!mem->nslabs) {
size = ALIGN(new_size, 1 << IO_TLB_SHIFT);
- io_tlb_nslabs = size >> IO_TLB_SHIFT;
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ 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);
}
@@ -181,14 +150,15 @@ void __init swiotlb_adjust_size(unsigned long new_size)
void swiotlb_print_info(void)
{
- unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+ unsigned long bytes = mem->nslabs << IO_TLB_SHIFT;
if (no_iotlb_memory) {
pr_warn("No low mem\n");
return;
}
- pr_info("mapped [mem %pa-%pa] (%luMB)\n", &io_tlb_start, &io_tlb_end,
+ pr_info("mapped [mem %pa-%pa] (%luMB)\n", &mem->start, &mem->end,
bytes >> 20);
}
@@ -200,57 +170,59 @@ void swiotlb_print_info(void)
*/
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)
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)
{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long i, bytes;
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;
+ mem->nslabs = nslabs;
+ mem->start = __pa(tlb);
+ mem->end = mem->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.
+ * between mem->start and mem->end.
*/
- alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(int));
- io_tlb_list = memblock_alloc(alloc_size, PAGE_SIZE);
- if (!io_tlb_list)
+ 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(io_tlb_nslabs * sizeof(phys_addr_t));
- io_tlb_orig_addr = memblock_alloc(alloc_size, PAGE_SIZE);
- if (!io_tlb_orig_addr)
+ 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);
- 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;
+ for (i = 0; i < mem->nslabs; i++) {
+ mem->list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ mem->orig_addr[i] = INVALID_PHYS_ADDR;
}
- io_tlb_index = 0;
+ mem->index = 0;
no_iotlb_memory = false;
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;
}
@@ -261,26 +233,27 @@ 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 (!io_tlb_nslabs) {
- io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
+ if (!mem->nslabs) {
+ mem->nslabs = (default_size >> IO_TLB_SHIFT);
+ mem->nslabs = ALIGN(mem->nslabs, IO_TLB_SEGSIZE);
}
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+ bytes = mem->nslabs << IO_TLB_SHIFT;
/* 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 (vstart && !swiotlb_init_with_tbl(vstart, mem->nslabs, verbose))
return;
- if (io_tlb_start) {
- memblock_free_early(io_tlb_start,
- PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
- io_tlb_start = 0;
+ if (mem->start) {
+ memblock_free_early(mem->start,
+ PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT));
+ mem->start = 0;
}
pr_warn("Cannot allocate buffer");
no_iotlb_memory = true;
@@ -294,22 +267,23 @@ swiotlb_init(int verbose)
int
swiotlb_late_init_with_default_size(size_t default_size)
{
- unsigned long bytes, req_nslabs = io_tlb_nslabs;
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+ unsigned long bytes, req_nslabs = mem->nslabs;
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 (!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(io_tlb_nslabs << IO_TLB_SHIFT);
- io_tlb_nslabs = SLABS_PER_PAGE << order;
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
+ order = get_order(mem->nslabs << IO_TLB_SHIFT);
+ mem->nslabs = SLABS_PER_PAGE << order;
+ bytes = mem->nslabs << IO_TLB_SHIFT;
while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
@@ -320,15 +294,15 @@ swiotlb_late_init_with_default_size(size_t default_size)
}
if (!vstart) {
- io_tlb_nslabs = req_nslabs;
+ mem->nslabs = req_nslabs;
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;
+ mem->nslabs = SLABS_PER_PAGE << order;
}
- rc = swiotlb_late_init_with_tbl(vstart, io_tlb_nslabs);
+ rc = swiotlb_late_init_with_tbl(vstart, mem->nslabs);
if (rc)
free_pages((unsigned long)vstart, order);
@@ -337,22 +311,25 @@ swiotlb_late_init_with_default_size(size_t default_size)
static void swiotlb_cleanup(void)
{
- io_tlb_end = 0;
- io_tlb_start = 0;
- io_tlb_nslabs = 0;
+ 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;
bytes = nslabs << IO_TLB_SHIFT;
- io_tlb_nslabs = nslabs;
- io_tlb_start = virt_to_phys(tlb);
- io_tlb_end = io_tlb_start + bytes;
+ mem->nslabs = nslabs;
+ mem->start = virt_to_phys(tlb);
+ mem->end = mem->start + bytes;
set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
memset(tlb, 0, bytes);
@@ -360,39 +337,39 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
/*
* 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.
+ * between mem->start and mem->end.
*/
- io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs * sizeof(int)));
- if (!io_tlb_list)
+ mem->list = (unsigned int *)__get_free_pages(GFP_KERNEL,
+ get_order(mem->nslabs * sizeof(int)));
+ if (!mem->list)
goto cleanup3;
- io_tlb_orig_addr = (phys_addr_t *)
+ mem->orig_addr = (phys_addr_t *)
__get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs *
+ get_order(mem->nslabs *
sizeof(phys_addr_t)));
- if (!io_tlb_orig_addr)
+ if (!mem->orig_addr)
goto cleanup4;
- 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;
+ for (i = 0; i < mem->nslabs; i++) {
+ mem->list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
+ mem->orig_addr[i] = INVALID_PHYS_ADDR;
}
- io_tlb_index = 0;
+ mem->index = 0;
no_iotlb_memory = false;
swiotlb_print_info();
late_alloc = 1;
- swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
+ swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
cleanup4:
- free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
- sizeof(int)));
- io_tlb_list = NULL;
+ free_pages((unsigned long)mem->list,
+ get_order(mem->nslabs * sizeof(int)));
+ mem->list = NULL;
cleanup3:
swiotlb_cleanup();
return -ENOMEM;
@@ -400,23 +377,25 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
void __init swiotlb_exit(void)
{
- if (!io_tlb_orig_addr)
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+
+ if (!mem->orig_addr)
return;
if (late_alloc) {
- 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));
+ 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(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));
+ 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();
}
@@ -465,7 +444,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t orig_addr,
size_t mapping_size, size_t alloc_size,
enum dma_data_direction dir, unsigned long attrs)
{
- dma_addr_t tbl_dma_addr = phys_to_dma_unencrypted(hwdev, io_tlb_start);
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
+ dma_addr_t tbl_dma_addr = phys_to_dma_unencrypted(hwdev, mem->start);
unsigned long flags;
phys_addr_t tlb_addr;
unsigned int nslots, stride, index, wrap;
@@ -516,13 +496,13 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t orig_addr,
* Find suitable number of IO TLB entries size that will fit this
* request and allocate a buffer from that IO TLB pool.
*/
- spin_lock_irqsave(&io_tlb_lock, flags);
+ spin_lock_irqsave(&mem->lock, flags);
- if (unlikely(nslots > io_tlb_nslabs - io_tlb_used))
+ if (unlikely(nslots > mem->nslabs - mem->used))
goto not_found;
- index = ALIGN(io_tlb_index, stride);
- if (index >= io_tlb_nslabs)
+ index = ALIGN(mem->index, stride);
+ if (index >= mem->nslabs)
index = 0;
wrap = index;
@@ -530,7 +510,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t orig_addr,
while (iommu_is_span_boundary(index, nslots, offset_slots,
max_slots)) {
index += stride;
- if (index >= io_tlb_nslabs)
+ if (index >= mem->nslabs)
index = 0;
if (index == wrap)
goto not_found;
@@ -541,40 +521,40 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t orig_addr,
* contiguous buffers, we allocate the buffers from that slot
* and mark the entries as '0' indicating unavailable.
*/
- if (io_tlb_list[index] >= nslots) {
+ if (mem->list[index] >= nslots) {
int count = 0;
for (i = index; i < (int) (index + nslots); i++)
- io_tlb_list[i] = 0;
- for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--)
- io_tlb_list[i] = ++count;
- tlb_addr = io_tlb_start + (index << IO_TLB_SHIFT);
+ mem->list[i] = 0;
+ for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && mem->list[i]; i--)
+ mem->list[i] = ++count;
+ tlb_addr = mem->start + (index << IO_TLB_SHIFT);
/*
* Update the indices to avoid searching in the next
* round.
*/
- io_tlb_index = ((index + nslots) < io_tlb_nslabs
- ? (index + nslots) : 0);
+ mem->index = ((index + nslots) < mem->nslabs
+ ? (index + nslots) : 0);
goto found;
}
index += stride;
- if (index >= io_tlb_nslabs)
+ if (index >= mem->nslabs)
index = 0;
} while (index != wrap);
not_found:
- tmp_io_tlb_used = io_tlb_used;
+ tmp_io_tlb_used = mem->used;
- spin_unlock_irqrestore(&io_tlb_lock, flags);
+ spin_unlock_irqrestore(&mem->lock, flags);
if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n",
- alloc_size, io_tlb_nslabs, tmp_io_tlb_used);
+ alloc_size, mem->nslabs, tmp_io_tlb_used);
return (phys_addr_t)DMA_MAPPING_ERROR;
found:
- io_tlb_used += nslots;
- spin_unlock_irqrestore(&io_tlb_lock, flags);
+ mem->used += nslots;
+ spin_unlock_irqrestore(&mem->lock, flags);
/*
* Save away the mapping from the original address to the DMA address.
@@ -582,7 +562,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t orig_addr,
* needed.
*/
for (i = 0; i < nslots; i++)
- io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
+ mem->orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
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);
@@ -597,10 +577,11 @@ 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)
{
+ struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long flags;
int i, count, nslots = ALIGN(alloc_size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
- int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
- phys_addr_t orig_addr = io_tlb_orig_addr[index];
+ int index = (tlb_addr - mem->start) >> IO_TLB_SHIFT;
+ phys_addr_t orig_addr = mem->orig_addr[index];
/*
* First, sync the memory before unmapping the entry
@@ -616,36 +597,37 @@ 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);
{
count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
- io_tlb_list[index + nslots] : 0);
+ mem->list[index + nslots] : 0);
/*
* Step 1: return the slots to the free list, merging the
* slots with superceeding slots
*/
for (i = index + nslots - 1; i >= index; i--) {
- io_tlb_list[i] = ++count;
- io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
+ mem->list[i] = ++count;
+ mem->orig_addr[i] = INVALID_PHYS_ADDR;
}
/*
* Step 2: merge the returned slots with the preceding slots,
* if available (non zero)
*/
- for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
- io_tlb_list[i] = ++count;
+ for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && mem->list[i]; i--)
+ mem->list[i] = ++count;
- io_tlb_used -= nslots;
+ mem->used -= nslots;
}
- spin_unlock_irqrestore(&io_tlb_lock, flags);
+ 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)
{
- int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
- phys_addr_t orig_addr = io_tlb_orig_addr[index];
+ 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];
if (orig_addr == INVALID_PHYS_ADDR)
return;
@@ -713,21 +695,21 @@ 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.
+ * When SWIOTLB is initialized, even if mem->start points to physical
+ * address zero, mem->end surely doesn't.
*/
- return io_tlb_end != 0;
+ return io_tlb_default_mem.end != 0;
}
#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);
+ 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;
}
--
2.29.2.729.g45daf8777d-goog
To make this change as mechanical as possible, I didn't fix any
checkpatch.pl ERROR/WARNING.