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Merge branch 'stable/for-linus-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Browse Source 
Pull swiotlb updates from Konrad Rzeszutek Wilk:
 "Two memory encryption related patches (SWIOTLB is enabled by default
  for AMD-SEV):

   - Add support for alignment so that NVME can properly work

   - Keep track of requested DMA buffers length, as underlaying hardware
     devices can trip SWIOTLB to bounce too much and crash the kernel

  And a tiny fix to use proper APIs in drivers"

* 'stable/for-linus-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: Validate bounce size in the sync/unmap path
  nvme-pci: set min_align_mask
  swiotlb: respect min_align_mask
  swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single
  swiotlb: refactor swiotlb_tbl_map_single
  swiotlb: clean up swiotlb_tbl_unmap_single
  swiotlb: factor out a nr_slots helper
  swiotlb: factor out an io_tlb_offset helper
  swiotlb: add a IO_TLB_SIZE define
  driver core: add a min_align_mask field to struct device_dma_parameters
  sdhci: stop poking into swiotlb internals
This commit is contained in:
Linus Torvalds 2021-02-26 13:59:32 -08:00
commit ef9856a734
6 changed files with 229 additions and 137 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/mmc/host/sdhci.c
View File

@ -20,7 +20,6 @@
#include <linux/slab.h>
#include <linux/scatterlist.h>
#include <linux/sizes.h>
#include <linux/swiotlb.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
@ -4582,12 +4581,8 @@ int sdhci_setup_host(struct sdhci_host *host)
mmc->max_segs = SDHCI_MAX_SEGS;
} else if (host->flags & SDHCI_USE_SDMA) {
mmc->max_segs = 1;
if (swiotlb_max_segment()) {
unsigned int max_req_size = (1 << IO_TLB_SHIFT) *
IO_TLB_SEGSIZE;
mmc->max_req_size = min(mmc->max_req_size,
max_req_size);
}
mmc->max_req_size = min_t(size_t, mmc->max_req_size,
dma_max_mapping_size(mmc_dev(mmc)));
} else { /* PIO */
mmc->max_segs = SDHCI_MAX_SEGS;
}

1
drivers/nvme/host/pci.c
View File

@ -2632,6 +2632,7 @@ static void nvme_reset_work(struct work_struct *work)
* Don't limit the IOMMU merged segment size.
*/
dma_set_max_seg_size(dev->dev, 0xffffffff);
dma_set_min_align_mask(dev->dev, NVME_CTRL_PAGE_SIZE - 1);
mutex_unlock(&dev->shutdown_lock);

1
include/linux/device.h
View File

@ -291,6 +291,7 @@ struct device_dma_parameters {
* sg limitations.
*/
unsigned int max_segment_size;
unsigned int min_align_mask;
unsigned long segment_boundary_mask;
};

16
include/linux/dma-mapping.h
View File

@ -509,6 +509,22 @@ static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
return -EIO;
}
static inline unsigned int dma_get_min_align_mask(struct device *dev)
{
if (dev->dma_parms)
return dev->dma_parms->min_align_mask;
return 0;
}
static inline int dma_set_min_align_mask(struct device *dev,
unsigned int min_align_mask)
{
if (WARN_ON_ONCE(!dev->dma_parms))
return -EIO;
dev->dma_parms->min_align_mask = min_align_mask;
return 0;
}
static inline int dma_get_cache_alignment(void)
{
#ifdef ARCH_DMA_MINALIGN

1
include/linux/swiotlb.h
View File

@ -29,6 +29,7 @@ enum swiotlb_force {
* controllable.
*/
#define IO_TLB_SHIFT 11
#define IO_TLB_SIZE (1 << IO_TLB_SHIFT)
/* default to 64MB */
#define IO_TLB_DEFAULT_SIZE (64UL<<20)

338
kernel/dma/swiotlb.c
View File

@ -50,9 +50,6 @@
#define CREATE_TRACE_POINTS
#include <trace/events/swiotlb.h>
#define OFFSET(val,align) ((unsigned long) \
( (val) & ( (align) - 1)))
#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
/*
@ -102,6 +99,11 @@ static unsigned int max_segment;
#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
static phys_addr_t *io_tlb_orig_addr;
/*
* The mapped buffer's size should be validated during a sync operation.
*/
static size_t *io_tlb_orig_size;
/*
* Protect the above data structures in the map and unmap calls
*/
@ -171,7 +173,7 @@ void __init swiotlb_adjust_size(unsigned long new_size)
* adjust/expand SWIOTLB size for their use.
*/
if (!io_tlb_nslabs) {
size = ALIGN(new_size, 1 << IO_TLB_SHIFT);
size = ALIGN(new_size, IO_TLB_SIZE);
io_tlb_nslabs = size >> IO_TLB_SHIFT;
io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
@ -192,6 +194,16 @@ void swiotlb_print_info(void)
bytes >> 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
@ -240,9 +252,16 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
__func__, alloc_size, PAGE_SIZE);
alloc_size = PAGE_ALIGN(io_tlb_nslabs * sizeof(size_t));
io_tlb_orig_size = memblock_alloc(alloc_size, PAGE_SIZE);
if (!io_tlb_orig_size)
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_list[i] = IO_TLB_SEGSIZE - io_tlb_offset(i);
io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
io_tlb_orig_size[i] = 0;
}
io_tlb_index = 0;
no_iotlb_memory = false;
@ -363,7 +382,7 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
* between io_tlb_start and io_tlb_end.
*/
io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
get_order(io_tlb_nslabs * sizeof(int)));
get_order(io_tlb_nslabs * sizeof(int)));
if (!io_tlb_list)
goto cleanup3;
@ -374,9 +393,18 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
if (!io_tlb_orig_addr)
goto cleanup4;
io_tlb_orig_size = (size_t *)
__get_free_pages(GFP_KERNEL,
get_order(io_tlb_nslabs *
sizeof(size_t)));
if (!io_tlb_orig_size)
goto cleanup5;
for (i = 0; i < io_tlb_nslabs; i++) {
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
io_tlb_list[i] = IO_TLB_SEGSIZE - io_tlb_offset(i);
io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
io_tlb_orig_size[i] = 0;
}
io_tlb_index = 0;
no_iotlb_memory = false;
@ -389,6 +417,10 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
return 0;
cleanup5:
free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs *
sizeof(phys_addr_t)));
cleanup4:
free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
sizeof(int)));
@ -404,6 +436,8 @@ void __init swiotlb_exit(void)
return;
if (late_alloc) {
free_pages((unsigned long)io_tlb_orig_size,
get_order(io_tlb_nslabs * sizeof(size_t)));
free_pages((unsigned long)io_tlb_orig_addr,
get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
@ -413,6 +447,8 @@ void __init swiotlb_exit(void)
} else {
memblock_free_late(__pa(io_tlb_orig_addr),
PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
memblock_free_late(__pa(io_tlb_orig_size),
PAGE_ALIGN(io_tlb_nslabs * sizeof(size_t)));
memblock_free_late(__pa(io_tlb_list),
PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
memblock_free_late(io_tlb_start,
@ -461,19 +497,119 @@ static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
}
}
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t orig_addr,
#define slot_addr(start, idx) ((start) + ((idx) << IO_TLB_SHIFT))
/*
* 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);
}
/*
* Carefully handle integer overflow which can occur when boundary_mask == ~0UL.
*/
static inline unsigned long get_max_slots(unsigned long boundary_mask)
{
if (boundary_mask == ~0UL)
return 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
return nr_slots(boundary_mask + 1);
}
static unsigned int wrap_index(unsigned int index)
{
if (index >= io_tlb_nslabs)
return 0;
return index;
}
/*
* Find a suitable number of IO TLB entries size that will fit this request and
* allocate a buffer from that IO TLB pool.
*/
static int find_slots(struct device *dev, phys_addr_t orig_addr,
size_t alloc_size)
{
unsigned long boundary_mask = dma_get_seg_boundary(dev);
dma_addr_t tbl_dma_addr =
phys_to_dma_unencrypted(dev, io_tlb_start) & boundary_mask;
unsigned long max_slots = get_max_slots(boundary_mask);
unsigned int iotlb_align_mask =
dma_get_min_align_mask(dev) & ~(IO_TLB_SIZE - 1);
unsigned int nslots = nr_slots(alloc_size), stride;
unsigned int index, wrap, count = 0, i;
unsigned long flags;
BUG_ON(!nslots);
/*
* For mappings with an alignment requirement don't bother looping to
* unaligned slots once we found an aligned one. For allocations of
* PAGE_SIZE or larger only look for page aligned allocations.
*/
stride = (iotlb_align_mask >> IO_TLB_SHIFT) + 1;
if (alloc_size >= PAGE_SIZE)
stride = max(stride, stride << (PAGE_SHIFT - IO_TLB_SHIFT));
spin_lock_irqsave(&io_tlb_lock, flags);
if (unlikely(nslots > io_tlb_nslabs - io_tlb_used))
goto not_found;
index = wrap = wrap_index(ALIGN(io_tlb_index, stride));
do {
if ((slot_addr(tbl_dma_addr, index) & iotlb_align_mask) !=
(orig_addr & iotlb_align_mask)) {
index = wrap_index(index + 1);
continue;
}
/*
* If we find a slot that indicates we have 'nslots' number of
* contiguous buffers, we allocate the buffers from that slot
* and mark the entries as '0' indicating unavailable.
*/
if (!iommu_is_span_boundary(index, nslots,
nr_slots(tbl_dma_addr),
max_slots)) {
if (io_tlb_list[index] >= nslots)
goto found;
}
index = wrap_index(index + stride);
} while (index != wrap);
not_found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
return -1;
found:
for (i = index; i < index + nslots; i++)
io_tlb_list[i] = 0;
for (i = index - 1;
io_tlb_offset(i) != IO_TLB_SEGSIZE - 1 &&
io_tlb_list[i]; i--)
io_tlb_list[i] = ++count;
/*
* Update the indices to avoid searching in the next round.
*/
if (index + nslots < io_tlb_nslabs)
io_tlb_index = index + nslots;
else
io_tlb_index = 0;
io_tlb_used += nslots;
spin_unlock_irqrestore(&io_tlb_lock, flags);
return index;
}
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)
{
dma_addr_t tbl_dma_addr = phys_to_dma_unencrypted(hwdev, io_tlb_start);
unsigned long flags;
unsigned int offset = swiotlb_align_offset(dev, orig_addr);
unsigned int index, i;
phys_addr_t tlb_addr;
unsigned int nslots, stride, index, wrap;
int i;
unsigned long mask;
unsigned long offset_slots;
unsigned long max_slots;
unsigned long tmp_io_tlb_used;
if (no_iotlb_memory)
panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
@ -482,114 +618,47 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t orig_addr,
pr_warn_once("Memory encryption is active and system is using DMA bounce buffers\n");
if (mapping_size > alloc_size) {
dev_warn_once(hwdev, "Invalid sizes (mapping: %zd bytes, alloc: %zd bytes)",
dev_warn_once(dev, "Invalid sizes (mapping: %zd bytes, alloc: %zd bytes)",
mapping_size, alloc_size);
return (phys_addr_t)DMA_MAPPING_ERROR;
}
mask = dma_get_seg_boundary(hwdev);
tbl_dma_addr &= mask;
offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
/*
* Carefully handle integer overflow which can occur when mask == ~0UL.
*/
max_slots = mask + 1
? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
: 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
/*
* For mappings greater than or equal to a page, we limit the stride
* (and hence alignment) to a page size.
*/
nslots = ALIGN(alloc_size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
if (alloc_size >= PAGE_SIZE)
stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
else
stride = 1;
BUG_ON(!nslots);
/*
* 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);
if (unlikely(nslots > io_tlb_nslabs - io_tlb_used))
goto not_found;
index = ALIGN(io_tlb_index, stride);
if (index >= io_tlb_nslabs)
index = 0;
wrap = index;
do {
while (iommu_is_span_boundary(index, nslots, offset_slots,
max_slots)) {
index += stride;
if (index >= io_tlb_nslabs)
index = 0;
if (index == wrap)
goto not_found;
}
/*
* If we find a slot that indicates we have 'nslots' number of
* contiguous buffers, we allocate the buffers from that slot
* and mark the entries as '0' indicating unavailable.
*/
if (io_tlb_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);
/*
* Update the indices to avoid searching in the next
* round.
*/
io_tlb_index = ((index + nslots) < io_tlb_nslabs
? (index + nslots) : 0);
goto found;
}
index += stride;
if (index >= io_tlb_nslabs)
index = 0;
} while (index != wrap);
not_found:
tmp_io_tlb_used = io_tlb_used;
spin_unlock_irqrestore(&io_tlb_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);
return (phys_addr_t)DMA_MAPPING_ERROR;
found:
io_tlb_used += nslots;
spin_unlock_irqrestore(&io_tlb_lock, flags);
index = find_slots(dev, orig_addr, alloc_size + offset);
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, io_tlb_nslabs, io_tlb_used);
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 < nslots; i++)
io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
for (i = 0; i < nr_slots(alloc_size + offset); i++) {
io_tlb_orig_addr[index + i] = slot_addr(orig_addr, i);
io_tlb_orig_size[index+i] = alloc_size - (i << IO_TLB_SHIFT);
}
tlb_addr = slot_addr(io_tlb_start, index) + offset;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
swiotlb_bounce(orig_addr, tlb_addr, mapping_size, DMA_TO_DEVICE);
return tlb_addr;
}
static void validate_sync_size_and_truncate(struct device *hwdev, size_t orig_size, size_t *size)
{
if (*size > orig_size) {
/* Warn and truncate mapping_size */
dev_WARN_ONCE(hwdev, 1,
"Attempt for buffer overflow. Original size: %zu. Mapping size: %zu.\n",
orig_size, *size);
*size = orig_size;
}
}
/*
* tlb_addr is the physical address of the bounce buffer to unmap.
*/
@ -598,10 +667,13 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
enum dma_data_direction dir, unsigned long attrs)
{
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;
unsigned int offset = swiotlb_align_offset(hwdev, tlb_addr);
int i, count, nslots = nr_slots(alloc_size + offset);
int index = (tlb_addr - offset - io_tlb_start) >> IO_TLB_SHIFT;
phys_addr_t orig_addr = io_tlb_orig_addr[index];
validate_sync_size_and_truncate(hwdev, io_tlb_orig_size[index], &mapping_size);
/*
* First, sync the memory before unmapping the entry
*/
@ -617,26 +689,30 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* with slots below and above the pool being returned.
*/
spin_lock_irqsave(&io_tlb_lock, flags);
{
count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
io_tlb_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;
}
/*
* 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;
if (index + nslots < ALIGN(index + 1, IO_TLB_SEGSIZE))
count = io_tlb_list[index + nslots];
else
count = 0;
io_tlb_used -= nslots;
/*
* 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;
io_tlb_orig_size[i] = 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 && io_tlb_list[i];
i--)
io_tlb_list[i] = ++count;
io_tlb_used -= nslots;
spin_unlock_irqrestore(&io_tlb_lock, flags);
}
@ -645,11 +721,13 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
enum dma_sync_target target)
{
int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
size_t orig_size = io_tlb_orig_size[index];
phys_addr_t orig_addr = io_tlb_orig_addr[index];
if (orig_addr == INVALID_PHYS_ADDR)
return;
orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
validate_sync_size_and_truncate(hwdev, orig_size, &size);
switch (target) {
case SYNC_FOR_CPU:
@ -707,7 +785,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
size_t swiotlb_max_mapping_size(struct device *dev)
{
return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE;
return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE;
}
bool is_swiotlb_active(void)