mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 01:41:39 +00:00
![Petr Tesarik](/assets/img/avatar_default.png)
Limit the free list length to the size of the IO TLB. Transient pool can be
smaller than IO_TLB_SEGSIZE, but the free list is initialized with the
assumption that the total number of slots is a multiple of IO_TLB_SEGSIZE.
As a result, swiotlb_area_find_slots() may allocate slots past the end of
a transient IO TLB buffer.
Reported-by: Niklas Schnelle <schnelle@linux.ibm.com>
Closes: https://lore.kernel.org/linux-iommu/104a8c8fedffd1ff8a2890983e2ec1c26bff6810.camel@linux.ibm.com/
Fixes: 79636caad3
("swiotlb: if swiotlb is full, fall back to a transient memory pool")
Cc: stable@vger.kernel.org
Signed-off-by: Petr Tesarik <petr.tesarik1@huawei-partners.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
1727 lines
47 KiB
C
1727 lines
47 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Dynamic DMA mapping support.
|
|
*
|
|
* This implementation is a fallback for platforms that do not support
|
|
* I/O TLBs (aka DMA address translation hardware).
|
|
* Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com>
|
|
* Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com>
|
|
* Copyright (C) 2000, 2003 Hewlett-Packard Co
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
*
|
|
* 03/05/07 davidm Switch from PCI-DMA to generic device DMA API.
|
|
* 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid
|
|
* unnecessary i-cache flushing.
|
|
* 04/07/.. ak Better overflow handling. Assorted fixes.
|
|
* 05/09/10 linville Add support for syncing ranges, support syncing for
|
|
* DMA_BIDIRECTIONAL mappings, miscellaneous cleanup.
|
|
* 08/12/11 beckyb Add highmem support
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "software IO TLB: " fmt
|
|
|
|
#include <linux/cache.h>
|
|
#include <linux/cc_platform.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/dma-direct.h>
|
|
#include <linux/dma-map-ops.h>
|
|
#include <linux/export.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/io.h>
|
|
#include <linux/iommu-helper.h>
|
|
#include <linux/init.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/rculist.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/set_memory.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/string.h>
|
|
#include <linux/swiotlb.h>
|
|
#include <linux/types.h>
|
|
#ifdef CONFIG_DMA_RESTRICTED_POOL
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_reserved_mem.h>
|
|
#include <linux/slab.h>
|
|
#endif
|
|
|
|
#define CREATE_TRACE_POINTS
|
|
#include <trace/events/swiotlb.h>
|
|
|
|
#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
|
|
|
|
/*
|
|
* Minimum IO TLB size to bother booting with. Systems with mainly
|
|
* 64bit capable cards will only lightly use the swiotlb. If we can't
|
|
* 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)
|
|
|
|
/**
|
|
* struct io_tlb_slot - IO TLB slot descriptor
|
|
* @orig_addr: The original address corresponding to a mapped entry.
|
|
* @alloc_size: Size of the allocated buffer.
|
|
* @list: The free list describing the number of free entries available
|
|
* from each index.
|
|
*/
|
|
struct io_tlb_slot {
|
|
phys_addr_t orig_addr;
|
|
size_t alloc_size;
|
|
unsigned int list;
|
|
};
|
|
|
|
static bool swiotlb_force_bounce;
|
|
static bool swiotlb_force_disable;
|
|
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
|
|
static void swiotlb_dyn_alloc(struct work_struct *work);
|
|
|
|
static struct io_tlb_mem io_tlb_default_mem = {
|
|
.lock = __SPIN_LOCK_UNLOCKED(io_tlb_default_mem.lock),
|
|
.pools = LIST_HEAD_INIT(io_tlb_default_mem.pools),
|
|
.dyn_alloc = __WORK_INITIALIZER(io_tlb_default_mem.dyn_alloc,
|
|
swiotlb_dyn_alloc),
|
|
};
|
|
|
|
#else /* !CONFIG_SWIOTLB_DYNAMIC */
|
|
|
|
static struct io_tlb_mem io_tlb_default_mem;
|
|
|
|
#endif /* CONFIG_SWIOTLB_DYNAMIC */
|
|
|
|
static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
|
|
static unsigned long default_nareas;
|
|
|
|
/**
|
|
* struct io_tlb_area - IO TLB memory area descriptor
|
|
*
|
|
* This is a single area with a single lock.
|
|
*
|
|
* @used: The number of used IO TLB block.
|
|
* @index: The slot index to start searching in this area for next round.
|
|
* @lock: The lock to protect the above data structures in the map and
|
|
* unmap calls.
|
|
*/
|
|
struct io_tlb_area {
|
|
unsigned long used;
|
|
unsigned int index;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
/*
|
|
* Round up number of slabs to the next power of 2. The last area is going
|
|
* be smaller than the rest if default_nslabs is not power of two.
|
|
* The number of slot in an area should be a multiple of IO_TLB_SEGSIZE,
|
|
* otherwise a segment may span two or more areas. It conflicts with free
|
|
* contiguous slots tracking: free slots are treated contiguous no matter
|
|
* whether they cross an area boundary.
|
|
*
|
|
* Return true if default_nslabs is rounded up.
|
|
*/
|
|
static bool round_up_default_nslabs(void)
|
|
{
|
|
if (!default_nareas)
|
|
return false;
|
|
|
|
if (default_nslabs < IO_TLB_SEGSIZE * default_nareas)
|
|
default_nslabs = IO_TLB_SEGSIZE * default_nareas;
|
|
else if (is_power_of_2(default_nslabs))
|
|
return false;
|
|
default_nslabs = roundup_pow_of_two(default_nslabs);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* swiotlb_adjust_nareas() - adjust the number of areas and slots
|
|
* @nareas: Desired number of areas. Zero is treated as 1.
|
|
*
|
|
* Adjust the default number of areas in a memory pool.
|
|
* The default size of the memory pool may also change to meet minimum area
|
|
* size requirements.
|
|
*/
|
|
static void swiotlb_adjust_nareas(unsigned int nareas)
|
|
{
|
|
if (!nareas)
|
|
nareas = 1;
|
|
else if (!is_power_of_2(nareas))
|
|
nareas = roundup_pow_of_two(nareas);
|
|
|
|
default_nareas = nareas;
|
|
|
|
pr_info("area num %d.\n", nareas);
|
|
if (round_up_default_nslabs())
|
|
pr_info("SWIOTLB bounce buffer size roundup to %luMB",
|
|
(default_nslabs << IO_TLB_SHIFT) >> 20);
|
|
}
|
|
|
|
/**
|
|
* limit_nareas() - get the maximum number of areas for a given memory pool size
|
|
* @nareas: Desired number of areas.
|
|
* @nslots: Total number of slots in the memory pool.
|
|
*
|
|
* Limit the number of areas to the maximum possible number of areas in
|
|
* a memory pool of the given size.
|
|
*
|
|
* Return: Maximum possible number of areas.
|
|
*/
|
|
static unsigned int limit_nareas(unsigned int nareas, unsigned long nslots)
|
|
{
|
|
if (nslots < nareas * IO_TLB_SEGSIZE)
|
|
return nslots / IO_TLB_SEGSIZE;
|
|
return nareas;
|
|
}
|
|
|
|
static int __init
|
|
setup_io_tlb_npages(char *str)
|
|
{
|
|
if (isdigit(*str)) {
|
|
/* avoid tail segment of size < IO_TLB_SEGSIZE */
|
|
default_nslabs =
|
|
ALIGN(simple_strtoul(str, &str, 0), IO_TLB_SEGSIZE);
|
|
}
|
|
if (*str == ',')
|
|
++str;
|
|
if (isdigit(*str))
|
|
swiotlb_adjust_nareas(simple_strtoul(str, &str, 0));
|
|
if (*str == ',')
|
|
++str;
|
|
if (!strcmp(str, "force"))
|
|
swiotlb_force_bounce = true;
|
|
else if (!strcmp(str, "noforce"))
|
|
swiotlb_force_disable = true;
|
|
|
|
return 0;
|
|
}
|
|
early_param("swiotlb", setup_io_tlb_npages);
|
|
|
|
unsigned long swiotlb_size_or_default(void)
|
|
{
|
|
return default_nslabs << IO_TLB_SHIFT;
|
|
}
|
|
|
|
void __init swiotlb_adjust_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 (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);
|
|
if (round_up_default_nslabs())
|
|
size = default_nslabs << IO_TLB_SHIFT;
|
|
pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20);
|
|
}
|
|
|
|
void swiotlb_print_info(void)
|
|
{
|
|
struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
|
|
|
|
if (!mem->nslabs) {
|
|
pr_warn("No low mem\n");
|
|
return;
|
|
}
|
|
|
|
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)
|
|
{
|
|
return val & (IO_TLB_SEGSIZE - 1);
|
|
}
|
|
|
|
static inline unsigned long nr_slots(u64 val)
|
|
{
|
|
return DIV_ROUND_UP(val, IO_TLB_SIZE);
|
|
}
|
|
|
|
/*
|
|
* Early SWIOTLB allocation may be too early to allow an architecture to
|
|
* perform the desired operations. This function allows the architecture to
|
|
* call SWIOTLB when the operations are possible. It needs to be called
|
|
* before the SWIOTLB memory is used.
|
|
*/
|
|
void __init swiotlb_update_mem_attributes(void)
|
|
{
|
|
struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
|
|
unsigned long bytes;
|
|
|
|
if (!mem->nslabs || mem->late_alloc)
|
|
return;
|
|
bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
|
|
set_memory_decrypted((unsigned long)mem->vaddr, bytes >> PAGE_SHIFT);
|
|
}
|
|
|
|
static void swiotlb_init_io_tlb_pool(struct io_tlb_pool *mem, phys_addr_t start,
|
|
unsigned long nslabs, bool late_alloc, unsigned int nareas)
|
|
{
|
|
void *vaddr = phys_to_virt(start);
|
|
unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
|
|
|
|
mem->nslabs = nslabs;
|
|
mem->start = start;
|
|
mem->end = mem->start + bytes;
|
|
mem->late_alloc = late_alloc;
|
|
mem->nareas = nareas;
|
|
mem->area_nslabs = nslabs / mem->nareas;
|
|
|
|
for (i = 0; i < mem->nareas; i++) {
|
|
spin_lock_init(&mem->areas[i].lock);
|
|
mem->areas[i].index = 0;
|
|
mem->areas[i].used = 0;
|
|
}
|
|
|
|
for (i = 0; i < mem->nslabs; i++) {
|
|
mem->slots[i].list = min(IO_TLB_SEGSIZE - io_tlb_offset(i),
|
|
mem->nslabs - i);
|
|
mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
|
|
mem->slots[i].alloc_size = 0;
|
|
}
|
|
|
|
memset(vaddr, 0, bytes);
|
|
mem->vaddr = vaddr;
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* add_mem_pool() - add a memory pool to the allocator
|
|
* @mem: Software IO TLB allocator.
|
|
* @pool: Memory pool to be added.
|
|
*/
|
|
static void add_mem_pool(struct io_tlb_mem *mem, struct io_tlb_pool *pool)
|
|
{
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
spin_lock(&mem->lock);
|
|
list_add_rcu(&pool->node, &mem->pools);
|
|
mem->nslabs += pool->nslabs;
|
|
spin_unlock(&mem->lock);
|
|
#else
|
|
mem->nslabs = pool->nslabs;
|
|
#endif
|
|
}
|
|
|
|
static void __init *swiotlb_memblock_alloc(unsigned long nslabs,
|
|
unsigned int flags,
|
|
int (*remap)(void *tlb, unsigned long nslabs))
|
|
{
|
|
size_t bytes = PAGE_ALIGN(nslabs << IO_TLB_SHIFT);
|
|
void *tlb;
|
|
|
|
/*
|
|
* By default allocate the bounce buffer memory from low memory, but
|
|
* allow to pick a location everywhere for hypervisors with guest
|
|
* memory encryption.
|
|
*/
|
|
if (flags & SWIOTLB_ANY)
|
|
tlb = memblock_alloc(bytes, PAGE_SIZE);
|
|
else
|
|
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
|
|
|
|
if (!tlb) {
|
|
pr_warn("%s: Failed to allocate %zu bytes tlb structure\n",
|
|
__func__, bytes);
|
|
return NULL;
|
|
}
|
|
|
|
if (remap && remap(tlb, nslabs) < 0) {
|
|
memblock_free(tlb, PAGE_ALIGN(bytes));
|
|
pr_warn("%s: Failed to remap %zu bytes\n", __func__, bytes);
|
|
return NULL;
|
|
}
|
|
|
|
return tlb;
|
|
}
|
|
|
|
/*
|
|
* Statically reserve bounce buffer space and initialize bounce buffer data
|
|
* structures for the software IO TLB used to implement the DMA API.
|
|
*/
|
|
void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
|
|
int (*remap)(void *tlb, unsigned long nslabs))
|
|
{
|
|
struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
|
|
unsigned long nslabs;
|
|
unsigned int nareas;
|
|
size_t alloc_size;
|
|
void *tlb;
|
|
|
|
if (!addressing_limit && !swiotlb_force_bounce)
|
|
return;
|
|
if (swiotlb_force_disable)
|
|
return;
|
|
|
|
io_tlb_default_mem.force_bounce =
|
|
swiotlb_force_bounce || (flags & SWIOTLB_FORCE);
|
|
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
if (!remap)
|
|
io_tlb_default_mem.can_grow = true;
|
|
if (flags & SWIOTLB_ANY)
|
|
io_tlb_default_mem.phys_limit = virt_to_phys(high_memory - 1);
|
|
else
|
|
io_tlb_default_mem.phys_limit = ARCH_LOW_ADDRESS_LIMIT;
|
|
#endif
|
|
|
|
if (!default_nareas)
|
|
swiotlb_adjust_nareas(num_possible_cpus());
|
|
|
|
nslabs = default_nslabs;
|
|
nareas = limit_nareas(default_nareas, nslabs);
|
|
while ((tlb = swiotlb_memblock_alloc(nslabs, flags, remap)) == NULL) {
|
|
if (nslabs <= IO_TLB_MIN_SLABS)
|
|
return;
|
|
nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
|
|
nareas = limit_nareas(nareas, nslabs);
|
|
}
|
|
|
|
if (default_nslabs != nslabs) {
|
|
pr_info("SWIOTLB bounce buffer size adjusted %lu -> %lu slabs",
|
|
default_nslabs, nslabs);
|
|
default_nslabs = nslabs;
|
|
}
|
|
|
|
alloc_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), nslabs));
|
|
mem->slots = memblock_alloc(alloc_size, PAGE_SIZE);
|
|
if (!mem->slots) {
|
|
pr_warn("%s: Failed to allocate %zu bytes align=0x%lx\n",
|
|
__func__, alloc_size, PAGE_SIZE);
|
|
return;
|
|
}
|
|
|
|
mem->areas = memblock_alloc(array_size(sizeof(struct io_tlb_area),
|
|
nareas), SMP_CACHE_BYTES);
|
|
if (!mem->areas) {
|
|
pr_warn("%s: Failed to allocate mem->areas.\n", __func__);
|
|
return;
|
|
}
|
|
|
|
swiotlb_init_io_tlb_pool(mem, __pa(tlb), nslabs, false, nareas);
|
|
add_mem_pool(&io_tlb_default_mem, mem);
|
|
|
|
if (flags & SWIOTLB_VERBOSE)
|
|
swiotlb_print_info();
|
|
}
|
|
|
|
void __init swiotlb_init(bool addressing_limit, unsigned int flags)
|
|
{
|
|
swiotlb_init_remap(addressing_limit, flags, NULL);
|
|
}
|
|
|
|
/*
|
|
* Systems with larger DMA zones (those that don't support ISA) can
|
|
* initialize the swiotlb later using the slab allocator if needed.
|
|
* This should be just like above, but with some error catching.
|
|
*/
|
|
int swiotlb_init_late(size_t size, gfp_t gfp_mask,
|
|
int (*remap)(void *tlb, unsigned long nslabs))
|
|
{
|
|
struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
|
|
unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
|
|
unsigned int nareas;
|
|
unsigned char *vstart = NULL;
|
|
unsigned int order, area_order;
|
|
bool retried = false;
|
|
int rc = 0;
|
|
|
|
if (io_tlb_default_mem.nslabs)
|
|
return 0;
|
|
|
|
if (swiotlb_force_disable)
|
|
return 0;
|
|
|
|
io_tlb_default_mem.force_bounce = swiotlb_force_bounce;
|
|
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
if (!remap)
|
|
io_tlb_default_mem.can_grow = true;
|
|
if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp_mask & __GFP_DMA))
|
|
io_tlb_default_mem.phys_limit = DMA_BIT_MASK(zone_dma_bits);
|
|
else if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp_mask & __GFP_DMA32))
|
|
io_tlb_default_mem.phys_limit = DMA_BIT_MASK(32);
|
|
else
|
|
io_tlb_default_mem.phys_limit = virt_to_phys(high_memory - 1);
|
|
#endif
|
|
|
|
if (!default_nareas)
|
|
swiotlb_adjust_nareas(num_possible_cpus());
|
|
|
|
retry:
|
|
order = get_order(nslabs << IO_TLB_SHIFT);
|
|
nslabs = SLABS_PER_PAGE << order;
|
|
|
|
while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
|
|
vstart = (void *)__get_free_pages(gfp_mask | __GFP_NOWARN,
|
|
order);
|
|
if (vstart)
|
|
break;
|
|
order--;
|
|
nslabs = SLABS_PER_PAGE << order;
|
|
retried = true;
|
|
}
|
|
|
|
if (!vstart)
|
|
return -ENOMEM;
|
|
|
|
if (remap)
|
|
rc = remap(vstart, nslabs);
|
|
if (rc) {
|
|
free_pages((unsigned long)vstart, order);
|
|
|
|
nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
|
|
if (nslabs < IO_TLB_MIN_SLABS)
|
|
return rc;
|
|
retried = true;
|
|
goto retry;
|
|
}
|
|
|
|
if (retried) {
|
|
pr_warn("only able to allocate %ld MB\n",
|
|
(PAGE_SIZE << order) >> 20);
|
|
}
|
|
|
|
nareas = limit_nareas(default_nareas, nslabs);
|
|
area_order = get_order(array_size(sizeof(*mem->areas), nareas));
|
|
mem->areas = (struct io_tlb_area *)
|
|
__get_free_pages(GFP_KERNEL | __GFP_ZERO, area_order);
|
|
if (!mem->areas)
|
|
goto error_area;
|
|
|
|
mem->slots = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
|
get_order(array_size(sizeof(*mem->slots), nslabs)));
|
|
if (!mem->slots)
|
|
goto error_slots;
|
|
|
|
set_memory_decrypted((unsigned long)vstart,
|
|
(nslabs << IO_TLB_SHIFT) >> PAGE_SHIFT);
|
|
swiotlb_init_io_tlb_pool(mem, virt_to_phys(vstart), nslabs, true,
|
|
nareas);
|
|
add_mem_pool(&io_tlb_default_mem, mem);
|
|
|
|
swiotlb_print_info();
|
|
return 0;
|
|
|
|
error_slots:
|
|
free_pages((unsigned long)mem->areas, area_order);
|
|
error_area:
|
|
free_pages((unsigned long)vstart, order);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void __init swiotlb_exit(void)
|
|
{
|
|
struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
|
|
unsigned long tbl_vaddr;
|
|
size_t tbl_size, slots_size;
|
|
unsigned int area_order;
|
|
|
|
if (swiotlb_force_bounce)
|
|
return;
|
|
|
|
if (!mem->nslabs)
|
|
return;
|
|
|
|
pr_info("tearing down default memory pool\n");
|
|
tbl_vaddr = (unsigned long)phys_to_virt(mem->start);
|
|
tbl_size = PAGE_ALIGN(mem->end - mem->start);
|
|
slots_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), mem->nslabs));
|
|
|
|
set_memory_encrypted(tbl_vaddr, tbl_size >> PAGE_SHIFT);
|
|
if (mem->late_alloc) {
|
|
area_order = get_order(array_size(sizeof(*mem->areas),
|
|
mem->nareas));
|
|
free_pages((unsigned long)mem->areas, area_order);
|
|
free_pages(tbl_vaddr, get_order(tbl_size));
|
|
free_pages((unsigned long)mem->slots, get_order(slots_size));
|
|
} else {
|
|
memblock_free_late(__pa(mem->areas),
|
|
array_size(sizeof(*mem->areas), mem->nareas));
|
|
memblock_free_late(mem->start, tbl_size);
|
|
memblock_free_late(__pa(mem->slots), slots_size);
|
|
}
|
|
|
|
memset(mem, 0, sizeof(*mem));
|
|
}
|
|
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
|
|
/**
|
|
* alloc_dma_pages() - allocate pages to be used for DMA
|
|
* @gfp: GFP flags for the allocation.
|
|
* @bytes: Size of the buffer.
|
|
* @phys_limit: Maximum allowed physical address of the buffer.
|
|
*
|
|
* Allocate pages from the buddy allocator. If successful, make the allocated
|
|
* pages decrypted that they can be used for DMA.
|
|
*
|
|
* Return: Decrypted pages, %NULL on allocation failure, or ERR_PTR(-EAGAIN)
|
|
* if the allocated physical address was above @phys_limit.
|
|
*/
|
|
static struct page *alloc_dma_pages(gfp_t gfp, size_t bytes, u64 phys_limit)
|
|
{
|
|
unsigned int order = get_order(bytes);
|
|
struct page *page;
|
|
phys_addr_t paddr;
|
|
void *vaddr;
|
|
|
|
page = alloc_pages(gfp, order);
|
|
if (!page)
|
|
return NULL;
|
|
|
|
paddr = page_to_phys(page);
|
|
if (paddr + bytes - 1 > phys_limit) {
|
|
__free_pages(page, order);
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
|
|
vaddr = phys_to_virt(paddr);
|
|
if (set_memory_decrypted((unsigned long)vaddr, PFN_UP(bytes)))
|
|
goto error;
|
|
return page;
|
|
|
|
error:
|
|
/* Intentional leak if pages cannot be encrypted again. */
|
|
if (!set_memory_encrypted((unsigned long)vaddr, PFN_UP(bytes)))
|
|
__free_pages(page, order);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* swiotlb_alloc_tlb() - allocate a dynamic IO TLB buffer
|
|
* @dev: Device for which a memory pool is allocated.
|
|
* @bytes: Size of the buffer.
|
|
* @phys_limit: Maximum allowed physical address of the buffer.
|
|
* @gfp: GFP flags for the allocation.
|
|
*
|
|
* Return: Allocated pages, or %NULL on allocation failure.
|
|
*/
|
|
static struct page *swiotlb_alloc_tlb(struct device *dev, size_t bytes,
|
|
u64 phys_limit, gfp_t gfp)
|
|
{
|
|
struct page *page;
|
|
|
|
/*
|
|
* Allocate from the atomic pools if memory is encrypted and
|
|
* the allocation is atomic, because decrypting may block.
|
|
*/
|
|
if (!gfpflags_allow_blocking(gfp) && dev && force_dma_unencrypted(dev)) {
|
|
void *vaddr;
|
|
|
|
if (!IS_ENABLED(CONFIG_DMA_COHERENT_POOL))
|
|
return NULL;
|
|
|
|
return dma_alloc_from_pool(dev, bytes, &vaddr, gfp,
|
|
dma_coherent_ok);
|
|
}
|
|
|
|
gfp &= ~GFP_ZONEMASK;
|
|
if (phys_limit <= DMA_BIT_MASK(zone_dma_bits))
|
|
gfp |= __GFP_DMA;
|
|
else if (phys_limit <= DMA_BIT_MASK(32))
|
|
gfp |= __GFP_DMA32;
|
|
|
|
while (IS_ERR(page = alloc_dma_pages(gfp, bytes, phys_limit))) {
|
|
if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
|
|
phys_limit < DMA_BIT_MASK(64) &&
|
|
!(gfp & (__GFP_DMA32 | __GFP_DMA)))
|
|
gfp |= __GFP_DMA32;
|
|
else if (IS_ENABLED(CONFIG_ZONE_DMA) &&
|
|
!(gfp & __GFP_DMA))
|
|
gfp = (gfp & ~__GFP_DMA32) | __GFP_DMA;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
return page;
|
|
}
|
|
|
|
/**
|
|
* swiotlb_free_tlb() - free a dynamically allocated IO TLB buffer
|
|
* @vaddr: Virtual address of the buffer.
|
|
* @bytes: Size of the buffer.
|
|
*/
|
|
static void swiotlb_free_tlb(void *vaddr, size_t bytes)
|
|
{
|
|
if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) &&
|
|
dma_free_from_pool(NULL, vaddr, bytes))
|
|
return;
|
|
|
|
/* Intentional leak if pages cannot be encrypted again. */
|
|
if (!set_memory_encrypted((unsigned long)vaddr, PFN_UP(bytes)))
|
|
__free_pages(virt_to_page(vaddr), get_order(bytes));
|
|
}
|
|
|
|
/**
|
|
* swiotlb_alloc_pool() - allocate a new IO TLB memory pool
|
|
* @dev: Device for which a memory pool is allocated.
|
|
* @minslabs: Minimum number of slabs.
|
|
* @nslabs: Desired (maximum) number of slabs.
|
|
* @nareas: Number of areas.
|
|
* @phys_limit: Maximum DMA buffer physical address.
|
|
* @gfp: GFP flags for the allocations.
|
|
*
|
|
* Allocate and initialize a new IO TLB memory pool. The actual number of
|
|
* slabs may be reduced if allocation of @nslabs fails. If even
|
|
* @minslabs cannot be allocated, this function fails.
|
|
*
|
|
* Return: New memory pool, or %NULL on allocation failure.
|
|
*/
|
|
static struct io_tlb_pool *swiotlb_alloc_pool(struct device *dev,
|
|
unsigned long minslabs, unsigned long nslabs,
|
|
unsigned int nareas, u64 phys_limit, gfp_t gfp)
|
|
{
|
|
struct io_tlb_pool *pool;
|
|
unsigned int slot_order;
|
|
struct page *tlb;
|
|
size_t pool_size;
|
|
size_t tlb_size;
|
|
|
|
if (nslabs > SLABS_PER_PAGE << MAX_ORDER) {
|
|
nslabs = SLABS_PER_PAGE << MAX_ORDER;
|
|
nareas = limit_nareas(nareas, nslabs);
|
|
}
|
|
|
|
pool_size = sizeof(*pool) + array_size(sizeof(*pool->areas), nareas);
|
|
pool = kzalloc(pool_size, gfp);
|
|
if (!pool)
|
|
goto error;
|
|
pool->areas = (void *)pool + sizeof(*pool);
|
|
|
|
tlb_size = nslabs << IO_TLB_SHIFT;
|
|
while (!(tlb = swiotlb_alloc_tlb(dev, tlb_size, phys_limit, gfp))) {
|
|
if (nslabs <= minslabs)
|
|
goto error_tlb;
|
|
nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
|
|
nareas = limit_nareas(nareas, nslabs);
|
|
tlb_size = nslabs << IO_TLB_SHIFT;
|
|
}
|
|
|
|
slot_order = get_order(array_size(sizeof(*pool->slots), nslabs));
|
|
pool->slots = (struct io_tlb_slot *)
|
|
__get_free_pages(gfp, slot_order);
|
|
if (!pool->slots)
|
|
goto error_slots;
|
|
|
|
swiotlb_init_io_tlb_pool(pool, page_to_phys(tlb), nslabs, true, nareas);
|
|
return pool;
|
|
|
|
error_slots:
|
|
swiotlb_free_tlb(page_address(tlb), tlb_size);
|
|
error_tlb:
|
|
kfree(pool);
|
|
error:
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* swiotlb_dyn_alloc() - dynamic memory pool allocation worker
|
|
* @work: Pointer to dyn_alloc in struct io_tlb_mem.
|
|
*/
|
|
static void swiotlb_dyn_alloc(struct work_struct *work)
|
|
{
|
|
struct io_tlb_mem *mem =
|
|
container_of(work, struct io_tlb_mem, dyn_alloc);
|
|
struct io_tlb_pool *pool;
|
|
|
|
pool = swiotlb_alloc_pool(NULL, IO_TLB_MIN_SLABS, default_nslabs,
|
|
default_nareas, mem->phys_limit, GFP_KERNEL);
|
|
if (!pool) {
|
|
pr_warn_ratelimited("Failed to allocate new pool");
|
|
return;
|
|
}
|
|
|
|
add_mem_pool(mem, pool);
|
|
}
|
|
|
|
/**
|
|
* swiotlb_dyn_free() - RCU callback to free a memory pool
|
|
* @rcu: RCU head in the corresponding struct io_tlb_pool.
|
|
*/
|
|
static void swiotlb_dyn_free(struct rcu_head *rcu)
|
|
{
|
|
struct io_tlb_pool *pool = container_of(rcu, struct io_tlb_pool, rcu);
|
|
size_t slots_size = array_size(sizeof(*pool->slots), pool->nslabs);
|
|
size_t tlb_size = pool->end - pool->start;
|
|
|
|
free_pages((unsigned long)pool->slots, get_order(slots_size));
|
|
swiotlb_free_tlb(pool->vaddr, tlb_size);
|
|
kfree(pool);
|
|
}
|
|
|
|
/**
|
|
* swiotlb_find_pool() - find the IO TLB pool for a physical address
|
|
* @dev: Device which has mapped the DMA buffer.
|
|
* @paddr: Physical address within the DMA buffer.
|
|
*
|
|
* Find the IO TLB memory pool descriptor which contains the given physical
|
|
* address, if any.
|
|
*
|
|
* Return: Memory pool which contains @paddr, or %NULL if none.
|
|
*/
|
|
struct io_tlb_pool *swiotlb_find_pool(struct device *dev, phys_addr_t paddr)
|
|
{
|
|
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
|
|
struct io_tlb_pool *pool;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(pool, &mem->pools, node) {
|
|
if (paddr >= pool->start && paddr < pool->end)
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry_rcu(pool, &dev->dma_io_tlb_pools, node) {
|
|
if (paddr >= pool->start && paddr < pool->end)
|
|
goto out;
|
|
}
|
|
pool = NULL;
|
|
out:
|
|
rcu_read_unlock();
|
|
return pool;
|
|
}
|
|
|
|
/**
|
|
* swiotlb_del_pool() - remove an IO TLB pool from a device
|
|
* @dev: Owning device.
|
|
* @pool: Memory pool to be removed.
|
|
*/
|
|
static void swiotlb_del_pool(struct device *dev, struct io_tlb_pool *pool)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&dev->dma_io_tlb_lock, flags);
|
|
list_del_rcu(&pool->node);
|
|
spin_unlock_irqrestore(&dev->dma_io_tlb_lock, flags);
|
|
|
|
call_rcu(&pool->rcu, swiotlb_dyn_free);
|
|
}
|
|
|
|
#endif /* CONFIG_SWIOTLB_DYNAMIC */
|
|
|
|
/**
|
|
* swiotlb_dev_init() - initialize swiotlb fields in &struct device
|
|
* @dev: Device to be initialized.
|
|
*/
|
|
void swiotlb_dev_init(struct device *dev)
|
|
{
|
|
dev->dma_io_tlb_mem = &io_tlb_default_mem;
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
INIT_LIST_HEAD(&dev->dma_io_tlb_pools);
|
|
spin_lock_init(&dev->dma_io_tlb_lock);
|
|
dev->dma_uses_io_tlb = false;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Return the offset into a iotlb slot required to keep the device happy.
|
|
*/
|
|
static unsigned int swiotlb_align_offset(struct device *dev, u64 addr)
|
|
{
|
|
return addr & dma_get_min_align_mask(dev) & (IO_TLB_SIZE - 1);
|
|
}
|
|
|
|
/*
|
|
* Bounce: copy the swiotlb buffer from or back to the original dma location
|
|
*/
|
|
static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
struct io_tlb_pool *mem = swiotlb_find_pool(dev, tlb_addr);
|
|
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 = mem->vaddr + tlb_addr - mem->start;
|
|
unsigned int tlb_offset, orig_addr_offset;
|
|
|
|
if (orig_addr == INVALID_PHYS_ADDR)
|
|
return;
|
|
|
|
tlb_offset = tlb_addr & (IO_TLB_SIZE - 1);
|
|
orig_addr_offset = swiotlb_align_offset(dev, orig_addr);
|
|
if (tlb_offset < orig_addr_offset) {
|
|
dev_WARN_ONCE(dev, 1,
|
|
"Access before mapping start detected. orig offset %u, requested offset %u.\n",
|
|
orig_addr_offset, tlb_offset);
|
|
return;
|
|
}
|
|
|
|
tlb_offset -= orig_addr_offset;
|
|
if (tlb_offset > alloc_size) {
|
|
dev_WARN_ONCE(dev, 1,
|
|
"Buffer overflow detected. Allocation size: %zu. Mapping size: %zu+%u.\n",
|
|
alloc_size, size, tlb_offset);
|
|
return;
|
|
}
|
|
|
|
orig_addr += tlb_offset;
|
|
alloc_size -= tlb_offset;
|
|
|
|
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))) {
|
|
unsigned int offset = orig_addr & ~PAGE_MASK;
|
|
struct page *page;
|
|
unsigned int sz = 0;
|
|
unsigned long flags;
|
|
|
|
while (size) {
|
|
sz = min_t(size_t, PAGE_SIZE - offset, size);
|
|
|
|
local_irq_save(flags);
|
|
page = pfn_to_page(pfn);
|
|
if (dir == DMA_TO_DEVICE)
|
|
memcpy_from_page(vaddr, page, offset, sz);
|
|
else
|
|
memcpy_to_page(page, offset, vaddr, sz);
|
|
local_irq_restore(flags);
|
|
|
|
size -= sz;
|
|
pfn++;
|
|
vaddr += sz;
|
|
offset = 0;
|
|
}
|
|
} else if (dir == DMA_TO_DEVICE) {
|
|
memcpy(vaddr, phys_to_virt(orig_addr), size);
|
|
} else {
|
|
memcpy(phys_to_virt(orig_addr), vaddr, size);
|
|
}
|
|
}
|
|
|
|
static inline phys_addr_t slot_addr(phys_addr_t start, phys_addr_t idx)
|
|
{
|
|
return start + (idx << IO_TLB_SHIFT);
|
|
}
|
|
|
|
/*
|
|
* Carefully handle integer overflow which can occur when boundary_mask == ~0UL.
|
|
*/
|
|
static inline unsigned long get_max_slots(unsigned long boundary_mask)
|
|
{
|
|
return (boundary_mask >> IO_TLB_SHIFT) + 1;
|
|
}
|
|
|
|
static unsigned int wrap_area_index(struct io_tlb_pool *mem, unsigned int index)
|
|
{
|
|
if (index >= mem->area_nslabs)
|
|
return 0;
|
|
return index;
|
|
}
|
|
|
|
/*
|
|
* Track the total used slots with a global atomic value in order to have
|
|
* correct information to determine the high water mark. The mem_used()
|
|
* function gives imprecise results because there's no locking across
|
|
* multiple areas.
|
|
*/
|
|
#ifdef CONFIG_DEBUG_FS
|
|
static void inc_used_and_hiwater(struct io_tlb_mem *mem, unsigned int nslots)
|
|
{
|
|
unsigned long old_hiwater, new_used;
|
|
|
|
new_used = atomic_long_add_return(nslots, &mem->total_used);
|
|
old_hiwater = atomic_long_read(&mem->used_hiwater);
|
|
do {
|
|
if (new_used <= old_hiwater)
|
|
break;
|
|
} while (!atomic_long_try_cmpxchg(&mem->used_hiwater,
|
|
&old_hiwater, new_used));
|
|
}
|
|
|
|
static void dec_used(struct io_tlb_mem *mem, unsigned int nslots)
|
|
{
|
|
atomic_long_sub(nslots, &mem->total_used);
|
|
}
|
|
|
|
#else /* !CONFIG_DEBUG_FS */
|
|
static void inc_used_and_hiwater(struct io_tlb_mem *mem, unsigned int nslots)
|
|
{
|
|
}
|
|
static void dec_used(struct io_tlb_mem *mem, unsigned int nslots)
|
|
{
|
|
}
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
/**
|
|
* swiotlb_area_find_slots() - search for slots in one IO TLB memory area
|
|
* @dev: Device which maps the buffer.
|
|
* @pool: Memory pool to be searched.
|
|
* @area_index: Index of the IO TLB memory area to be searched.
|
|
* @orig_addr: Original (non-bounced) IO buffer address.
|
|
* @alloc_size: Total requested size of the bounce buffer,
|
|
* including initial alignment padding.
|
|
* @alloc_align_mask: Required alignment of the allocated buffer.
|
|
*
|
|
* Find a suitable sequence of IO TLB entries for the request and allocate
|
|
* a buffer from the given IO TLB memory area.
|
|
* This function takes care of locking.
|
|
*
|
|
* Return: Index of the first allocated slot, or -1 on error.
|
|
*/
|
|
static int swiotlb_area_find_slots(struct device *dev, struct io_tlb_pool *pool,
|
|
int area_index, phys_addr_t orig_addr, size_t alloc_size,
|
|
unsigned int alloc_align_mask)
|
|
{
|
|
struct io_tlb_area *area = pool->areas + area_index;
|
|
unsigned long boundary_mask = dma_get_seg_boundary(dev);
|
|
dma_addr_t tbl_dma_addr =
|
|
phys_to_dma_unencrypted(dev, pool->start) & boundary_mask;
|
|
unsigned long max_slots = get_max_slots(boundary_mask);
|
|
unsigned int iotlb_align_mask =
|
|
dma_get_min_align_mask(dev) | alloc_align_mask;
|
|
unsigned int nslots = nr_slots(alloc_size), stride;
|
|
unsigned int offset = swiotlb_align_offset(dev, orig_addr);
|
|
unsigned int index, slots_checked, count = 0, i;
|
|
unsigned long flags;
|
|
unsigned int slot_base;
|
|
unsigned int slot_index;
|
|
|
|
BUG_ON(!nslots);
|
|
BUG_ON(area_index >= pool->nareas);
|
|
|
|
/*
|
|
* For allocations of PAGE_SIZE or larger only look for page aligned
|
|
* allocations.
|
|
*/
|
|
if (alloc_size >= PAGE_SIZE)
|
|
iotlb_align_mask |= ~PAGE_MASK;
|
|
iotlb_align_mask &= ~(IO_TLB_SIZE - 1);
|
|
|
|
/*
|
|
* For mappings with an alignment requirement don't bother looping to
|
|
* unaligned slots once we found an aligned one.
|
|
*/
|
|
stride = (iotlb_align_mask >> IO_TLB_SHIFT) + 1;
|
|
|
|
spin_lock_irqsave(&area->lock, flags);
|
|
if (unlikely(nslots > pool->area_nslabs - area->used))
|
|
goto not_found;
|
|
|
|
slot_base = area_index * pool->area_nslabs;
|
|
index = area->index;
|
|
|
|
for (slots_checked = 0; slots_checked < pool->area_nslabs; ) {
|
|
slot_index = slot_base + index;
|
|
|
|
if (orig_addr &&
|
|
(slot_addr(tbl_dma_addr, slot_index) &
|
|
iotlb_align_mask) != (orig_addr & iotlb_align_mask)) {
|
|
index = wrap_area_index(pool, index + 1);
|
|
slots_checked++;
|
|
continue;
|
|
}
|
|
|
|
if (!iommu_is_span_boundary(slot_index, nslots,
|
|
nr_slots(tbl_dma_addr),
|
|
max_slots)) {
|
|
if (pool->slots[slot_index].list >= nslots)
|
|
goto found;
|
|
}
|
|
index = wrap_area_index(pool, index + stride);
|
|
slots_checked += stride;
|
|
}
|
|
|
|
not_found:
|
|
spin_unlock_irqrestore(&area->lock, flags);
|
|
return -1;
|
|
|
|
found:
|
|
/*
|
|
* If we find a slot that indicates we have 'nslots' number of
|
|
* contiguous buffers, we allocate the buffers from that slot onwards
|
|
* and set the list of free entries to '0' indicating unavailable.
|
|
*/
|
|
for (i = slot_index; i < slot_index + nslots; i++) {
|
|
pool->slots[i].list = 0;
|
|
pool->slots[i].alloc_size = alloc_size - (offset +
|
|
((i - slot_index) << IO_TLB_SHIFT));
|
|
}
|
|
for (i = slot_index - 1;
|
|
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
|
|
pool->slots[i].list; i--)
|
|
pool->slots[i].list = ++count;
|
|
|
|
/*
|
|
* Update the indices to avoid searching in the next round.
|
|
*/
|
|
area->index = wrap_area_index(pool, index + nslots);
|
|
area->used += nslots;
|
|
spin_unlock_irqrestore(&area->lock, flags);
|
|
|
|
inc_used_and_hiwater(dev->dma_io_tlb_mem, nslots);
|
|
return slot_index;
|
|
}
|
|
|
|
/**
|
|
* swiotlb_pool_find_slots() - search for slots in one memory pool
|
|
* @dev: Device which maps the buffer.
|
|
* @pool: Memory pool to be searched.
|
|
* @orig_addr: Original (non-bounced) IO buffer address.
|
|
* @alloc_size: Total requested size of the bounce buffer,
|
|
* including initial alignment padding.
|
|
* @alloc_align_mask: Required alignment of the allocated buffer.
|
|
*
|
|
* Search through one memory pool to find a sequence of slots that match the
|
|
* allocation constraints.
|
|
*
|
|
* Return: Index of the first allocated slot, or -1 on error.
|
|
*/
|
|
static int swiotlb_pool_find_slots(struct device *dev, struct io_tlb_pool *pool,
|
|
phys_addr_t orig_addr, size_t alloc_size,
|
|
unsigned int alloc_align_mask)
|
|
{
|
|
int start = raw_smp_processor_id() & (pool->nareas - 1);
|
|
int i = start, index;
|
|
|
|
do {
|
|
index = swiotlb_area_find_slots(dev, pool, i, orig_addr,
|
|
alloc_size, alloc_align_mask);
|
|
if (index >= 0)
|
|
return index;
|
|
if (++i >= pool->nareas)
|
|
i = 0;
|
|
} while (i != start);
|
|
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
|
|
/**
|
|
* swiotlb_find_slots() - search for slots in the whole swiotlb
|
|
* @dev: Device which maps the buffer.
|
|
* @orig_addr: Original (non-bounced) IO buffer address.
|
|
* @alloc_size: Total requested size of the bounce buffer,
|
|
* including initial alignment padding.
|
|
* @alloc_align_mask: Required alignment of the allocated buffer.
|
|
* @retpool: Used memory pool, updated on return.
|
|
*
|
|
* Search through the whole software IO TLB to find a sequence of slots that
|
|
* match the allocation constraints.
|
|
*
|
|
* Return: Index of the first allocated slot, or -1 on error.
|
|
*/
|
|
static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
|
|
size_t alloc_size, unsigned int alloc_align_mask,
|
|
struct io_tlb_pool **retpool)
|
|
{
|
|
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
|
|
struct io_tlb_pool *pool;
|
|
unsigned long nslabs;
|
|
unsigned long flags;
|
|
u64 phys_limit;
|
|
int index;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(pool, &mem->pools, node) {
|
|
index = swiotlb_pool_find_slots(dev, pool, orig_addr,
|
|
alloc_size, alloc_align_mask);
|
|
if (index >= 0) {
|
|
rcu_read_unlock();
|
|
goto found;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
if (!mem->can_grow)
|
|
return -1;
|
|
|
|
schedule_work(&mem->dyn_alloc);
|
|
|
|
nslabs = nr_slots(alloc_size);
|
|
phys_limit = min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
|
|
pool = swiotlb_alloc_pool(dev, nslabs, nslabs, 1, phys_limit,
|
|
GFP_NOWAIT | __GFP_NOWARN);
|
|
if (!pool)
|
|
return -1;
|
|
|
|
index = swiotlb_pool_find_slots(dev, pool, orig_addr,
|
|
alloc_size, alloc_align_mask);
|
|
if (index < 0) {
|
|
swiotlb_dyn_free(&pool->rcu);
|
|
return -1;
|
|
}
|
|
|
|
pool->transient = true;
|
|
spin_lock_irqsave(&dev->dma_io_tlb_lock, flags);
|
|
list_add_rcu(&pool->node, &dev->dma_io_tlb_pools);
|
|
spin_unlock_irqrestore(&dev->dma_io_tlb_lock, flags);
|
|
|
|
found:
|
|
WRITE_ONCE(dev->dma_uses_io_tlb, true);
|
|
|
|
/*
|
|
* The general barrier orders reads and writes against a presumed store
|
|
* of the SWIOTLB buffer address by a device driver (to a driver private
|
|
* data structure). It serves two purposes.
|
|
*
|
|
* First, the store to dev->dma_uses_io_tlb must be ordered before the
|
|
* presumed store. This guarantees that the returned buffer address
|
|
* cannot be passed to another CPU before updating dev->dma_uses_io_tlb.
|
|
*
|
|
* Second, the load from mem->pools must be ordered before the same
|
|
* presumed store. This guarantees that the returned buffer address
|
|
* cannot be observed by another CPU before an update of the RCU list
|
|
* that was made by swiotlb_dyn_alloc() on a third CPU (cf. multicopy
|
|
* atomicity).
|
|
*
|
|
* See also the comment in is_swiotlb_buffer().
|
|
*/
|
|
smp_mb();
|
|
|
|
*retpool = pool;
|
|
return index;
|
|
}
|
|
|
|
#else /* !CONFIG_SWIOTLB_DYNAMIC */
|
|
|
|
static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
|
|
size_t alloc_size, unsigned int alloc_align_mask,
|
|
struct io_tlb_pool **retpool)
|
|
{
|
|
*retpool = &dev->dma_io_tlb_mem->defpool;
|
|
return swiotlb_pool_find_slots(dev, *retpool,
|
|
orig_addr, alloc_size, alloc_align_mask);
|
|
}
|
|
|
|
#endif /* CONFIG_SWIOTLB_DYNAMIC */
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
/**
|
|
* mem_used() - get number of used slots in an allocator
|
|
* @mem: Software IO TLB allocator.
|
|
*
|
|
* The result is accurate in this version of the function, because an atomic
|
|
* counter is available if CONFIG_DEBUG_FS is set.
|
|
*
|
|
* Return: Number of used slots.
|
|
*/
|
|
static unsigned long mem_used(struct io_tlb_mem *mem)
|
|
{
|
|
return atomic_long_read(&mem->total_used);
|
|
}
|
|
|
|
#else /* !CONFIG_DEBUG_FS */
|
|
|
|
/**
|
|
* mem_pool_used() - get number of used slots in a memory pool
|
|
* @pool: Software IO TLB memory pool.
|
|
*
|
|
* The result is not accurate, see mem_used().
|
|
*
|
|
* Return: Approximate number of used slots.
|
|
*/
|
|
static unsigned long mem_pool_used(struct io_tlb_pool *pool)
|
|
{
|
|
int i;
|
|
unsigned long used = 0;
|
|
|
|
for (i = 0; i < pool->nareas; i++)
|
|
used += pool->areas[i].used;
|
|
return used;
|
|
}
|
|
|
|
/**
|
|
* mem_used() - get number of used slots in an allocator
|
|
* @mem: Software IO TLB allocator.
|
|
*
|
|
* The result is not accurate, because there is no locking of individual
|
|
* areas.
|
|
*
|
|
* Return: Approximate number of used slots.
|
|
*/
|
|
static unsigned long mem_used(struct io_tlb_mem *mem)
|
|
{
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
struct io_tlb_pool *pool;
|
|
unsigned long used = 0;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(pool, &mem->pools, node)
|
|
used += mem_pool_used(pool);
|
|
rcu_read_unlock();
|
|
|
|
return used;
|
|
#else
|
|
return mem_pool_used(&mem->defpool);
|
|
#endif
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
|
|
size_t mapping_size, size_t alloc_size,
|
|
unsigned int alloc_align_mask, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
|
|
unsigned int offset = swiotlb_align_offset(dev, orig_addr);
|
|
struct io_tlb_pool *pool;
|
|
unsigned int i;
|
|
int index;
|
|
phys_addr_t tlb_addr;
|
|
|
|
if (!mem || !mem->nslabs) {
|
|
dev_warn_ratelimited(dev,
|
|
"Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
|
|
return (phys_addr_t)DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
if (cc_platform_has(CC_ATTR_MEM_ENCRYPT))
|
|
pr_warn_once("Memory encryption is active and system is using DMA bounce buffers\n");
|
|
|
|
if (mapping_size > alloc_size) {
|
|
dev_warn_once(dev, "Invalid sizes (mapping: %zd bytes, alloc: %zd bytes)",
|
|
mapping_size, alloc_size);
|
|
return (phys_addr_t)DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
index = swiotlb_find_slots(dev, orig_addr,
|
|
alloc_size + offset, alloc_align_mask, &pool);
|
|
if (index == -1) {
|
|
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, mem->nslabs, mem_used(mem));
|
|
return (phys_addr_t)DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
/*
|
|
* Save away the mapping from the original address to the DMA address.
|
|
* This is needed when we sync the memory. Then we sync the buffer if
|
|
* needed.
|
|
*/
|
|
for (i = 0; i < nr_slots(alloc_size + offset); i++)
|
|
pool->slots[index + i].orig_addr = slot_addr(orig_addr, i);
|
|
tlb_addr = slot_addr(pool->start, index) + offset;
|
|
/*
|
|
* When the device is writing memory, i.e. dir == DMA_FROM_DEVICE, copy
|
|
* the original buffer to the TLB buffer before initiating DMA in order
|
|
* to preserve the original's data if the device does a partial write,
|
|
* i.e. if the device doesn't overwrite the entire buffer. Preserving
|
|
* the original data, even if it's garbage, is necessary to match
|
|
* hardware behavior. Use of swiotlb is supposed to be transparent,
|
|
* i.e. swiotlb must not corrupt memory by clobbering unwritten bytes.
|
|
*/
|
|
swiotlb_bounce(dev, tlb_addr, mapping_size, DMA_TO_DEVICE);
|
|
return tlb_addr;
|
|
}
|
|
|
|
static void swiotlb_release_slots(struct device *dev, phys_addr_t tlb_addr)
|
|
{
|
|
struct io_tlb_pool *mem = swiotlb_find_pool(dev, tlb_addr);
|
|
unsigned long flags;
|
|
unsigned int offset = swiotlb_align_offset(dev, tlb_addr);
|
|
int index = (tlb_addr - offset - mem->start) >> IO_TLB_SHIFT;
|
|
int nslots = nr_slots(mem->slots[index].alloc_size + offset);
|
|
int aindex = index / mem->area_nslabs;
|
|
struct io_tlb_area *area = &mem->areas[aindex];
|
|
int count, i;
|
|
|
|
/*
|
|
* Return the buffer to the free list by setting the corresponding
|
|
* entries to indicate the number of contiguous entries available.
|
|
* While returning the entries to the free list, we merge the entries
|
|
* with slots below and above the pool being returned.
|
|
*/
|
|
BUG_ON(aindex >= mem->nareas);
|
|
|
|
spin_lock_irqsave(&area->lock, flags);
|
|
if (index + nslots < ALIGN(index + 1, IO_TLB_SEGSIZE))
|
|
count = mem->slots[index + nslots].list;
|
|
else
|
|
count = 0;
|
|
|
|
/*
|
|
* Step 1: return the slots to the free list, merging the slots with
|
|
* superceeding slots
|
|
*/
|
|
for (i = index + nslots - 1; i >= index; i--) {
|
|
mem->slots[i].list = ++count;
|
|
mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
|
|
mem->slots[i].alloc_size = 0;
|
|
}
|
|
|
|
/*
|
|
* Step 2: merge the returned slots with the preceding slots, if
|
|
* available (non zero)
|
|
*/
|
|
for (i = index - 1;
|
|
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 && mem->slots[i].list;
|
|
i--)
|
|
mem->slots[i].list = ++count;
|
|
area->used -= nslots;
|
|
spin_unlock_irqrestore(&area->lock, flags);
|
|
|
|
dec_used(dev->dma_io_tlb_mem, nslots);
|
|
}
|
|
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
|
|
/**
|
|
* swiotlb_del_transient() - delete a transient memory pool
|
|
* @dev: Device which mapped the buffer.
|
|
* @tlb_addr: Physical address within a bounce buffer.
|
|
*
|
|
* Check whether the address belongs to a transient SWIOTLB memory pool.
|
|
* If yes, then delete the pool.
|
|
*
|
|
* Return: %true if @tlb_addr belonged to a transient pool that was released.
|
|
*/
|
|
static bool swiotlb_del_transient(struct device *dev, phys_addr_t tlb_addr)
|
|
{
|
|
struct io_tlb_pool *pool;
|
|
|
|
pool = swiotlb_find_pool(dev, tlb_addr);
|
|
if (!pool->transient)
|
|
return false;
|
|
|
|
dec_used(dev->dma_io_tlb_mem, pool->nslabs);
|
|
swiotlb_del_pool(dev, pool);
|
|
return true;
|
|
}
|
|
|
|
#else /* !CONFIG_SWIOTLB_DYNAMIC */
|
|
|
|
static inline bool swiotlb_del_transient(struct device *dev,
|
|
phys_addr_t tlb_addr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* CONFIG_SWIOTLB_DYNAMIC */
|
|
|
|
/*
|
|
* tlb_addr is the physical address of the bounce buffer to unmap.
|
|
*/
|
|
void swiotlb_tbl_unmap_single(struct device *dev, phys_addr_t tlb_addr,
|
|
size_t mapping_size, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
/*
|
|
* First, sync the memory before unmapping the entry
|
|
*/
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
|
|
(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
|
|
swiotlb_bounce(dev, tlb_addr, mapping_size, DMA_FROM_DEVICE);
|
|
|
|
if (swiotlb_del_transient(dev, tlb_addr))
|
|
return;
|
|
swiotlb_release_slots(dev, tlb_addr);
|
|
}
|
|
|
|
void swiotlb_sync_single_for_device(struct device *dev, phys_addr_t tlb_addr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
|
|
swiotlb_bounce(dev, tlb_addr, size, DMA_TO_DEVICE);
|
|
else
|
|
BUG_ON(dir != DMA_FROM_DEVICE);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Create a swiotlb mapping for the buffer at @paddr, and in case of DMAing
|
|
* to the device copy the data into it as well.
|
|
*/
|
|
dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir, unsigned long attrs)
|
|
{
|
|
phys_addr_t swiotlb_addr;
|
|
dma_addr_t dma_addr;
|
|
|
|
trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size);
|
|
|
|
swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, size, 0, dir,
|
|
attrs);
|
|
if (swiotlb_addr == (phys_addr_t)DMA_MAPPING_ERROR)
|
|
return DMA_MAPPING_ERROR;
|
|
|
|
/* 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, dir,
|
|
attrs | DMA_ATTR_SKIP_CPU_SYNC);
|
|
dev_WARN_ONCE(dev, 1,
|
|
"swiotlb addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
|
|
&dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
|
|
return DMA_MAPPING_ERROR;
|
|
}
|
|
|
|
if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
arch_sync_dma_for_device(swiotlb_addr, size, dir);
|
|
return dma_addr;
|
|
}
|
|
|
|
size_t swiotlb_max_mapping_size(struct device *dev)
|
|
{
|
|
int min_align_mask = dma_get_min_align_mask(dev);
|
|
int min_align = 0;
|
|
|
|
/*
|
|
* swiotlb_find_slots() skips slots according to
|
|
* min align mask. This affects max mapping size.
|
|
* Take it into acount here.
|
|
*/
|
|
if (min_align_mask)
|
|
min_align = roundup(min_align_mask, IO_TLB_SIZE);
|
|
|
|
return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE - min_align;
|
|
}
|
|
|
|
/**
|
|
* is_swiotlb_allocated() - check if the default software IO TLB is initialized
|
|
*/
|
|
bool is_swiotlb_allocated(void)
|
|
{
|
|
return io_tlb_default_mem.nslabs;
|
|
}
|
|
|
|
bool is_swiotlb_active(struct device *dev)
|
|
{
|
|
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
|
|
|
|
return mem && mem->nslabs;
|
|
}
|
|
|
|
/**
|
|
* default_swiotlb_base() - get the base address of the default SWIOTLB
|
|
*
|
|
* Get the lowest physical address used by the default software IO TLB pool.
|
|
*/
|
|
phys_addr_t default_swiotlb_base(void)
|
|
{
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
io_tlb_default_mem.can_grow = false;
|
|
#endif
|
|
return io_tlb_default_mem.defpool.start;
|
|
}
|
|
|
|
/**
|
|
* default_swiotlb_limit() - get the address limit of the default SWIOTLB
|
|
*
|
|
* Get the highest physical address used by the default software IO TLB pool.
|
|
*/
|
|
phys_addr_t default_swiotlb_limit(void)
|
|
{
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
return io_tlb_default_mem.phys_limit;
|
|
#else
|
|
return io_tlb_default_mem.defpool.end - 1;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
static int io_tlb_used_get(void *data, u64 *val)
|
|
{
|
|
struct io_tlb_mem *mem = data;
|
|
|
|
*val = mem_used(mem);
|
|
return 0;
|
|
}
|
|
|
|
static int io_tlb_hiwater_get(void *data, u64 *val)
|
|
{
|
|
struct io_tlb_mem *mem = data;
|
|
|
|
*val = atomic_long_read(&mem->used_hiwater);
|
|
return 0;
|
|
}
|
|
|
|
static int io_tlb_hiwater_set(void *data, u64 val)
|
|
{
|
|
struct io_tlb_mem *mem = data;
|
|
|
|
/* Only allow setting to zero */
|
|
if (val != 0)
|
|
return -EINVAL;
|
|
|
|
atomic_long_set(&mem->used_hiwater, val);
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_io_tlb_used, io_tlb_used_get, NULL, "%llu\n");
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_io_tlb_hiwater, io_tlb_hiwater_get,
|
|
io_tlb_hiwater_set, "%llu\n");
|
|
|
|
static void swiotlb_create_debugfs_files(struct io_tlb_mem *mem,
|
|
const char *dirname)
|
|
{
|
|
atomic_long_set(&mem->total_used, 0);
|
|
atomic_long_set(&mem->used_hiwater, 0);
|
|
|
|
mem->debugfs = debugfs_create_dir(dirname, io_tlb_default_mem.debugfs);
|
|
if (!mem->nslabs)
|
|
return;
|
|
|
|
debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
|
|
debugfs_create_file("io_tlb_used", 0400, mem->debugfs, mem,
|
|
&fops_io_tlb_used);
|
|
debugfs_create_file("io_tlb_used_hiwater", 0600, mem->debugfs, mem,
|
|
&fops_io_tlb_hiwater);
|
|
}
|
|
|
|
static int __init swiotlb_create_default_debugfs(void)
|
|
{
|
|
swiotlb_create_debugfs_files(&io_tlb_default_mem, "swiotlb");
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(swiotlb_create_default_debugfs);
|
|
|
|
#else /* !CONFIG_DEBUG_FS */
|
|
|
|
static inline void swiotlb_create_debugfs_files(struct io_tlb_mem *mem,
|
|
const char *dirname)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
#ifdef CONFIG_DMA_RESTRICTED_POOL
|
|
|
|
struct page *swiotlb_alloc(struct device *dev, size_t size)
|
|
{
|
|
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
|
|
struct io_tlb_pool *pool;
|
|
phys_addr_t tlb_addr;
|
|
int index;
|
|
|
|
if (!mem)
|
|
return NULL;
|
|
|
|
index = swiotlb_find_slots(dev, 0, size, 0, &pool);
|
|
if (index == -1)
|
|
return NULL;
|
|
|
|
tlb_addr = slot_addr(pool->start, index);
|
|
|
|
return pfn_to_page(PFN_DOWN(tlb_addr));
|
|
}
|
|
|
|
bool swiotlb_free(struct device *dev, struct page *page, size_t size)
|
|
{
|
|
phys_addr_t tlb_addr = page_to_phys(page);
|
|
|
|
if (!is_swiotlb_buffer(dev, tlb_addr))
|
|
return false;
|
|
|
|
swiotlb_release_slots(dev, tlb_addr);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int rmem_swiotlb_device_init(struct reserved_mem *rmem,
|
|
struct device *dev)
|
|
{
|
|
struct io_tlb_mem *mem = rmem->priv;
|
|
unsigned long nslabs = rmem->size >> IO_TLB_SHIFT;
|
|
|
|
/* Set Per-device io tlb area to one */
|
|
unsigned int nareas = 1;
|
|
|
|
if (PageHighMem(pfn_to_page(PHYS_PFN(rmem->base)))) {
|
|
dev_err(dev, "Restricted DMA pool must be accessible within the linear mapping.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Since multiple devices can share the same pool, the private data,
|
|
* io_tlb_mem struct, will be initialized by the first device attached
|
|
* to it.
|
|
*/
|
|
if (!mem) {
|
|
struct io_tlb_pool *pool;
|
|
|
|
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
|
|
if (!mem)
|
|
return -ENOMEM;
|
|
pool = &mem->defpool;
|
|
|
|
pool->slots = kcalloc(nslabs, sizeof(*pool->slots), GFP_KERNEL);
|
|
if (!pool->slots) {
|
|
kfree(mem);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pool->areas = kcalloc(nareas, sizeof(*pool->areas),
|
|
GFP_KERNEL);
|
|
if (!pool->areas) {
|
|
kfree(pool->slots);
|
|
kfree(mem);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
set_memory_decrypted((unsigned long)phys_to_virt(rmem->base),
|
|
rmem->size >> PAGE_SHIFT);
|
|
swiotlb_init_io_tlb_pool(pool, rmem->base, nslabs,
|
|
false, nareas);
|
|
mem->force_bounce = true;
|
|
mem->for_alloc = true;
|
|
#ifdef CONFIG_SWIOTLB_DYNAMIC
|
|
spin_lock_init(&mem->lock);
|
|
#endif
|
|
add_mem_pool(mem, pool);
|
|
|
|
rmem->priv = mem;
|
|
|
|
swiotlb_create_debugfs_files(mem, rmem->name);
|
|
}
|
|
|
|
dev->dma_io_tlb_mem = mem;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rmem_swiotlb_device_release(struct reserved_mem *rmem,
|
|
struct device *dev)
|
|
{
|
|
dev->dma_io_tlb_mem = &io_tlb_default_mem;
|
|
}
|
|
|
|
static const struct reserved_mem_ops rmem_swiotlb_ops = {
|
|
.device_init = rmem_swiotlb_device_init,
|
|
.device_release = rmem_swiotlb_device_release,
|
|
};
|
|
|
|
static int __init rmem_swiotlb_setup(struct reserved_mem *rmem)
|
|
{
|
|
unsigned long node = rmem->fdt_node;
|
|
|
|
if (of_get_flat_dt_prop(node, "reusable", NULL) ||
|
|
of_get_flat_dt_prop(node, "linux,cma-default", NULL) ||
|
|
of_get_flat_dt_prop(node, "linux,dma-default", NULL) ||
|
|
of_get_flat_dt_prop(node, "no-map", NULL))
|
|
return -EINVAL;
|
|
|
|
rmem->ops = &rmem_swiotlb_ops;
|
|
pr_info("Reserved memory: created restricted DMA pool at %pa, size %ld MiB\n",
|
|
&rmem->base, (unsigned long)rmem->size / SZ_1M);
|
|
return 0;
|
|
}
|
|
|
|
RESERVEDMEM_OF_DECLARE(dma, "restricted-dma-pool", rmem_swiotlb_setup);
|
|
#endif /* CONFIG_DMA_RESTRICTED_POOL */
|