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Commit ccb30186 authored by David S. Miller's avatar David S. Miller
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Merge branch 'iommu-generic-allocator' 

Sowmini Varadhan says:

====================
Generic IOMMU pooled allocator

Investigation of network performance on Sparc shows a high
degree of locking contention in the IOMMU allocator, and it
was noticed that the PowerPC code has a better locking model.

This patch series tries to extract the generic parts of the
PowerPC code so that it can be shared across multiple PCI
devices and architectures.

v10: resend patchv9 without RFC tag, and a new mail Message-Id,
(previous non-RFC attempt did not show up on the patchwork queue?)

Full revision history below:
v2 changes:
  - incorporate David Miller editorial comments: sparc specific
    fields moved from iommu-common into sparc's iommu_64.h
  - make the npools value an input parameter, for the case when
    the iommu map size is not very large
  - cookie_to_index mapping, and optimizations for span-boundary
    check, for use case such as LDC.

v3: eliminate iommu_sparc, rearrange the ->demap indirection to
    be invoked under the pool lock.

v4: David Miller review changes:
  - s/IOMMU_ERROR_CODE/DMA_ERROR_CODE
  - page_table_map_base and page_table_shift are unsigned long, not u32.

v5: removed ->cookie_to_index and ->demap indirection from the
    iommu_tbl_ops The caller needs to call these functions as needed,
    before invoking the generic arena allocator functions.
    Added the "skip_span_boundary" argument to iommu_tbl_pool_init() for
    those callers like LDC which do no care about span boundary checks.

v6: removed iommu_tbl_ops, and instead pass the ->flush_all as
    an indirection to iommu_tbl_pool_init(); only invoke ->flush_all
    when there is no large_pool, based on the assumption that large-pool
    usage is infrequently encountered

v7: moved pool_hash initialization to lib/iommu-common.c and cleaned up
    code duplication from sun4v/sun4u/ldc.

v8: Addresses BenH comments with one exception: I've left the
    IOMMU_POOL_HASH as is, so that powerpc can tailor it to their
    convenience.  Discard trylock for simple spin_lock to acquire pool

v9: Addresses latest BenH comments: need_flush checks, add support
    for dma mask and align_order.

v10: resend without RFC tag, and new mail Message-Id.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents c12f048f 2f0c0fdc
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Inline Side-by-side
Showing with 515 additions and 331 deletions
arch/sparc/include/asm/iommu_64.h
View file @ ccb30186
......@@ -16,6 +16,7 @@
#define IOPTE_WRITE 0x0000000000000002UL
#define IOMMU_NUM_CTXS 4096
#include <linux/iommu-common.h>
struct iommu_arena {
unsigned long *map;
......@@ -24,11 +25,10 @@ struct iommu_arena {
};
struct iommu {
struct iommu_map_table tbl;
spinlock_t lock;
struct iommu_arena arena;
void (*flush_all)(struct iommu *);
u32 dma_addr_mask;
iopte_t *page_table;
u32 page_table_map_base;
unsigned long iommu_control;
unsigned long iommu_tsbbase;
unsigned long iommu_flush;
......@@ -40,7 +40,6 @@ struct iommu {
unsigned long dummy_page_pa;
unsigned long ctx_lowest_free;
DECLARE_BITMAP(ctx_bitmap, IOMMU_NUM_CTXS);
u32 dma_addr_mask;
};
struct strbuf {
......
arch/sparc/kernel/iommu.c
View file @ ccb30186
......@@ -13,6 +13,7 @@
#include <linux/errno.h>
#include <linux/iommu-helper.h>
#include <linux/bitmap.h>
#include <linux/iommu-common.h>
#ifdef CONFIG_PCI
#include <linux/pci.h>
......@@ -45,8 +46,9 @@
"i" (ASI_PHYS_BYPASS_EC_E))
/* Must be invoked under the IOMMU lock. */
static void iommu_flushall(struct iommu *iommu)
static void iommu_flushall(struct iommu_map_table *iommu_map_table)
{
struct iommu *iommu = container_of(iommu_map_table, struct iommu, tbl);
if (iommu->iommu_flushinv) {
iommu_write(iommu->iommu_flushinv, ~(u64)0);
} else {
......@@ -87,94 +89,6 @@ static inline void iopte_make_dummy(struct iommu *iommu, iopte_t *iopte)
iopte_val(*iopte) = val;
}
/* Based almost entirely upon the ppc64 iommu allocator. If you use the 'handle'
* facility it must all be done in one pass while under the iommu lock.
*
* On sun4u platforms, we only flush the IOMMU once every time we've passed
* over the entire page table doing allocations. Therefore we only ever advance
* the hint and cannot backtrack it.
*/
unsigned long iommu_range_alloc(struct device *dev,
struct iommu *iommu,
unsigned long npages,
unsigned long *handle)
{
unsigned long n, end, start, limit, boundary_size;
struct iommu_arena *arena = &iommu->arena;
int pass = 0;
/* This allocator was derived from x86_64's bit string search */
/* Sanity check */
if (unlikely(npages == 0)) {
if (printk_ratelimit())
WARN_ON(1);
return DMA_ERROR_CODE;
}
if (handle && *handle)
start = *handle;
else
start = arena->hint;
limit = arena->limit;
/* The case below can happen if we have a small segment appended
* to a large, or when the previous alloc was at the very end of
* the available space. If so, go back to the beginning and flush.
*/
if (start >= limit) {
start = 0;
if (iommu->flush_all)
iommu->flush_all(iommu);
}
again:
if (dev)
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
1 << IO_PAGE_SHIFT);
else
boundary_size = ALIGN(1UL << 32, 1 << IO_PAGE_SHIFT);
n = iommu_area_alloc(arena->map, limit, start, npages,
iommu->page_table_map_base >> IO_PAGE_SHIFT,
boundary_size >> IO_PAGE_SHIFT, 0);
if (n == -1) {
if (likely(pass < 1)) {
/* First failure, rescan from the beginning. */
start = 0;
if (iommu->flush_all)
iommu->flush_all(iommu);
pass++;
goto again;
} else {
/* Second failure, give up */
return DMA_ERROR_CODE;
}
}
end = n + npages;
arena->hint = end;
/* Update handle for SG allocations */
if (handle)
*handle = end;
return n;
}
void iommu_range_free(struct iommu *iommu, dma_addr_t dma_addr, unsigned long npages)
{
struct iommu_arena *arena = &iommu->arena;
unsigned long entry;
entry = (dma_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
bitmap_clear(arena->map, entry, npages);
}
int iommu_table_init(struct iommu *iommu, int tsbsize,
u32 dma_offset, u32 dma_addr_mask,
int numa_node)
......@@ -187,22 +101,20 @@ int iommu_table_init(struct iommu *iommu, int tsbsize,
/* Setup initial software IOMMU state. */
spin_lock_init(&iommu->lock);
iommu->ctx_lowest_free = 1;
iommu->page_table_map_base = dma_offset;
iommu->tbl.table_map_base = dma_offset;
iommu->dma_addr_mask = dma_addr_mask;
/* Allocate and initialize the free area map. */
sz = num_tsb_entries / 8;
sz = (sz + 7UL) & ~7UL;
iommu->arena.map = kmalloc_node(sz, GFP_KERNEL, numa_node);
if (!iommu->arena.map) {
printk(KERN_ERR "IOMMU: Error, kmalloc(arena.map) failed.\n");
iommu->tbl.map = kmalloc_node(sz, GFP_KERNEL, numa_node);
if (!iommu->tbl.map)
return -ENOMEM;
}
memset(iommu->arena.map, 0, sz);
iommu->arena.limit = num_tsb_entries;
memset(iommu->tbl.map, 0, sz);
if (tlb_type != hypervisor)
iommu->flush_all = iommu_flushall;
iommu_tbl_pool_init(&iommu->tbl, num_tsb_entries, IO_PAGE_SHIFT,
(tlb_type != hypervisor ? iommu_flushall : NULL),
false, 1, false);
/* Allocate and initialize the dummy page which we
* set inactive IO PTEs to point to.
......@@ -235,18 +147,20 @@ int iommu_table_init(struct iommu *iommu, int tsbsize,
iommu->dummy_page = 0UL;
out_free_map:
kfree(iommu->arena.map);
iommu->arena.map = NULL;
kfree(iommu->tbl.map);
iommu->tbl.map = NULL;
return -ENOMEM;
}
static inline iopte_t *alloc_npages(struct device *dev, struct iommu *iommu,
static inline iopte_t *alloc_npages(struct device *dev,
struct iommu *iommu,
unsigned long npages)
{
unsigned long entry;
entry = iommu_range_alloc(dev, iommu, npages, NULL);
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages, NULL,
(unsigned long)(-1), 0);
if (unlikely(entry == DMA_ERROR_CODE))
return NULL;
......@@ -284,7 +198,7 @@ static void *dma_4u_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_addrp, gfp_t gfp,
struct dma_attrs *attrs)
{
unsigned long flags, order, first_page;
unsigned long order, first_page;
struct iommu *iommu;
struct page *page;
int npages, nid;
......@@ -306,16 +220,14 @@ static void *dma_4u_alloc_coherent(struct device *dev, size_t size,
iommu = dev->archdata.iommu;
spin_lock_irqsave(&iommu->lock, flags);
iopte = alloc_npages(dev, iommu, size >> IO_PAGE_SHIFT);
spin_unlock_irqrestore(&iommu->lock, flags);
if (unlikely(iopte == NULL)) {
free_pages(first_page, order);
return NULL;
}
*dma_addrp = (iommu->page_table_map_base +
*dma_addrp = (iommu->tbl.table_map_base +
((iopte - iommu->page_table) << IO_PAGE_SHIFT));
ret = (void *) first_page;
npages = size >> IO_PAGE_SHIFT;
......@@ -336,16 +248,12 @@ static void dma_4u_free_coherent(struct device *dev, size_t size,
struct dma_attrs *attrs)
{
struct iommu *iommu;
unsigned long flags, order, npages;
unsigned long order, npages;
npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
iommu = dev->archdata.iommu;
spin_lock_irqsave(&iommu->lock, flags);
iommu_range_free(iommu, dvma, npages);
spin_unlock_irqrestore(&iommu->lock, flags);
iommu_tbl_range_free(&iommu->tbl, dvma, npages, DMA_ERROR_CODE);
order = get_order(size);
if (order < 10)
......@@ -375,8 +283,8 @@ static dma_addr_t dma_4u_map_page(struct device *dev, struct page *page,
npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
npages >>= IO_PAGE_SHIFT;
spin_lock_irqsave(&iommu->lock, flags);
base = alloc_npages(dev, iommu, npages);
spin_lock_irqsave(&iommu->lock, flags);
ctx = 0;
if (iommu->iommu_ctxflush)
ctx = iommu_alloc_ctx(iommu);
......@@ -385,7 +293,7 @@ static dma_addr_t dma_4u_map_page(struct device *dev, struct page *page,
if (unlikely(!base))
goto bad;
bus_addr = (iommu->page_table_map_base +
bus_addr = (iommu->tbl.table_map_base +
((base - iommu->page_table) << IO_PAGE_SHIFT));
ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
base_paddr = __pa(oaddr & IO_PAGE_MASK);
......@@ -496,7 +404,7 @@ static void dma_4u_unmap_page(struct device *dev, dma_addr_t bus_addr,
npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
npages >>= IO_PAGE_SHIFT;
base = iommu->page_table +
((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
((bus_addr - iommu->tbl.table_map_base) >> IO_PAGE_SHIFT);
bus_addr &= IO_PAGE_MASK;
spin_lock_irqsave(&iommu->lock, flags);
......@@ -515,11 +423,10 @@ static void dma_4u_unmap_page(struct device *dev, dma_addr_t bus_addr,
for (i = 0; i < npages; i++)
iopte_make_dummy(iommu, base + i);
iommu_range_free(iommu, bus_addr, npages);
iommu_free_ctx(iommu, ctx);
spin_unlock_irqrestore(&iommu->lock, flags);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, DMA_ERROR_CODE);
}
static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
......@@ -567,7 +474,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
max_seg_size = dma_get_max_seg_size(dev);
seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
base_shift = iommu->tbl.table_map_base >> IO_PAGE_SHIFT;
for_each_sg(sglist, s, nelems, i) {
unsigned long paddr, npages, entry, out_entry = 0, slen;
iopte_t *base;
......@@ -581,7 +488,8 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
/* Allocate iommu entries for that segment */
paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE);
entry = iommu_range_alloc(dev, iommu, npages, &handle);
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages,
&handle, (unsigned long)(-1), 0);
/* Handle failure */
if (unlikely(entry == DMA_ERROR_CODE)) {
......@@ -594,7 +502,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
base = iommu->page_table + entry;
/* Convert entry to a dma_addr_t */
dma_addr = iommu->page_table_map_base +
dma_addr = iommu->tbl.table_map_base +
(entry << IO_PAGE_SHIFT);
dma_addr |= (s->offset & ~IO_PAGE_MASK);
......@@ -654,15 +562,17 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
vaddr = s->dma_address & IO_PAGE_MASK;
npages = iommu_num_pages(s->dma_address, s->dma_length,
IO_PAGE_SIZE);
iommu_range_free(iommu, vaddr, npages);
entry = (vaddr - iommu->page_table_map_base)
entry = (vaddr - iommu->tbl.table_map_base)
>> IO_PAGE_SHIFT;
base = iommu->page_table + entry;
for (j = 0; j < npages; j++)
iopte_make_dummy(iommu, base + j);
iommu_tbl_range_free(&iommu->tbl, vaddr, npages,
DMA_ERROR_CODE);
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
}
......@@ -684,10 +594,11 @@ static unsigned long fetch_sg_ctx(struct iommu *iommu, struct scatterlist *sg)
if (iommu->iommu_ctxflush) {
iopte_t *base;
u32 bus_addr;
struct iommu_map_table *tbl = &iommu->tbl;
bus_addr = sg->dma_address & IO_PAGE_MASK;
base = iommu->page_table +
((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
((bus_addr - tbl->table_map_base) >> IO_PAGE_SHIFT);
ctx = (iopte_val(*base) & IOPTE_CONTEXT) >> 47UL;
}
......@@ -723,9 +634,8 @@ static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist,
if (!len)
break;
npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE);
iommu_range_free(iommu, dma_handle, npages);
entry = ((dma_handle - iommu->page_table_map_base)
entry = ((dma_handle - iommu->tbl.table_map_base)
>> IO_PAGE_SHIFT);
base = iommu->page_table + entry;
......@@ -737,6 +647,8 @@ static void dma_4u_unmap_sg(struct device *dev, struct scatterlist *sglist,
for (i = 0; i < npages; i++)
iopte_make_dummy(iommu, base + i);
iommu_tbl_range_free(&iommu->tbl, dma_handle, npages,
DMA_ERROR_CODE);
sg = sg_next(sg);
}
......@@ -770,9 +682,10 @@ static void dma_4u_sync_single_for_cpu(struct device *dev,
if (iommu->iommu_ctxflush &&
strbuf->strbuf_ctxflush) {
iopte_t *iopte;
struct iommu_map_table *tbl = &iommu->tbl;
iopte = iommu->page_table +
((bus_addr - iommu->page_table_map_base)>>IO_PAGE_SHIFT);
((bus_addr - tbl->table_map_base)>>IO_PAGE_SHIFT);
ctx = (iopte_val(*iopte) & IOPTE_CONTEXT) >> 47UL;
}
......@@ -805,9 +718,10 @@ static void dma_4u_sync_sg_for_cpu(struct device *dev,
if (iommu->iommu_ctxflush &&
strbuf->strbuf_ctxflush) {
iopte_t *iopte;
struct iommu_map_table *tbl = &iommu->tbl;
iopte = iommu->page_table +
((sglist[0].dma_address - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
iopte = iommu->page_table + ((sglist[0].dma_address -
tbl->table_map_base) >> IO_PAGE_SHIFT);
ctx = (iopte_val(*iopte) & IOPTE_CONTEXT) >> 47UL;
}
......
arch/sparc/kernel/iommu_common.h
View file @ ccb30186
......@@ -48,12 +48,4 @@ static inline int is_span_boundary(unsigned long entry,
return iommu_is_span_boundary(entry, nr, shift, boundary_size);
}
unsigned long iommu_range_alloc(struct device *dev,
struct iommu *iommu,
unsigned long npages,
unsigned long *handle);
void iommu_range_free(struct iommu *iommu,
dma_addr_t dma_addr,
unsigned long npages);
#endif /* _IOMMU_COMMON_H */
arch/sparc/kernel/ldc.c
View file @ ccb30186
......@@ -15,6 +15,7 @@
#include <linux/list.h>
#include <linux/init.h>
#include <linux/bitmap.h>
#include <linux/iommu-common.h>
#include <asm/hypervisor.h>
#include <asm/iommu.h>
......@@ -27,6 +28,10 @@
#define DRV_MODULE_VERSION "1.1"
#define DRV_MODULE_RELDATE "July 22, 2008"
#define COOKIE_PGSZ_CODE 0xf000000000000000ULL
#define COOKIE_PGSZ_CODE_SHIFT 60ULL
static char version[] =
DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
#define LDC_PACKET_SIZE 64
......@@ -98,10 +103,10 @@ static const struct ldc_mode_ops stream_ops;
int ldom_domaining_enabled;
struct ldc_iommu {
/* Protects arena alloc/free. */
/* Protects ldc_unmap. */
spinlock_t lock;
struct iommu_arena arena;
struct ldc_mtable_entry *page_table;
struct iommu_map_table iommu_map_table;
};
struct ldc_channel {
......@@ -998,31 +1003,59 @@ static void free_queue(unsigned long num_entries, struct ldc_packet *q)
free_pages((unsigned long)q, order);
}
static unsigned long ldc_cookie_to_index(u64 cookie, void *arg)
{
u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT;
/* struct ldc_iommu *ldc_iommu = (struct ldc_iommu *)arg; */
cookie &= ~COOKIE_PGSZ_CODE;
return (cookie >> (13ULL + (szcode * 3ULL)));
}
static void ldc_demap(struct ldc_iommu *iommu, unsigned long id, u64 cookie,
unsigned long entry, unsigned long npages)
{
struct ldc_mtable_entry *base;
unsigned long i, shift;
shift = (cookie >> COOKIE_PGSZ_CODE_SHIFT) * 3;
base = iommu->page_table + entry;
for (i = 0; i < npages; i++) {
if (base->cookie)
sun4v_ldc_revoke(id, cookie + (i << shift),
base->cookie);
base->mte = 0;
}
}
/* XXX Make this configurable... XXX */
#define LDC_IOTABLE_SIZE (8 * 1024)
static int ldc_iommu_init(struct ldc_channel *lp)
static int ldc_iommu_init(const char *name, struct ldc_channel *lp)
{
unsigned long sz, num_tsb_entries, tsbsize, order;
struct ldc_iommu *iommu = &lp->iommu;
struct ldc_iommu *ldc_iommu = &lp->iommu;
struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table;
struct ldc_mtable_entry *table;
unsigned long hv_err;
int err;
num_tsb_entries = LDC_IOTABLE_SIZE;
tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
spin_lock_init(&iommu->lock);
spin_lock_init(&ldc_iommu->lock);
sz = num_tsb_entries / 8;
sz = (sz + 7UL) & ~7UL;
iommu->arena.map = kzalloc(sz, GFP_KERNEL);
if (!iommu->arena.map) {
iommu->map = kzalloc(sz, GFP_KERNEL);
if (!iommu->map) {
printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz);
return -ENOMEM;
}
iommu->arena.limit = num_tsb_entries;
iommu_tbl_pool_init(iommu, num_tsb_entries, PAGE_SHIFT,
NULL, false /* no large pool */,
1 /* npools */,
true /* skip span boundary check */);
order = get_order(tsbsize);
......@@ -1037,7 +1070,7 @@ static int ldc_iommu_init(struct ldc_channel *lp)
memset(table, 0, PAGE_SIZE << order);
iommu->page_table = table;
ldc_iommu->page_table = table;
hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table),
num_tsb_entries);
......@@ -1049,31 +1082,32 @@ static int ldc_iommu_init(struct ldc_channel *lp)
out_free_table:
free_pages((unsigned long) table, order);
iommu->page_table = NULL;
ldc_iommu->page_table = NULL;
out_free_map:
kfree(iommu->arena.map);
iommu->arena.map = NULL;
kfree(iommu->map);
iommu->map = NULL;
return err;
}
static void ldc_iommu_release(struct ldc_channel *lp)
{
struct ldc_iommu *iommu = &lp->iommu;
struct ldc_iommu *ldc_iommu = &lp->iommu;
struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table;
unsigned long num_tsb_entries, tsbsize, order;
(void) sun4v_ldc_set_map_table(lp->id, 0, 0);
num_tsb_entries = iommu->arena.limit;
num_tsb_entries = iommu->poolsize * iommu->nr_pools;
tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
order = get_order(tsbsize);
free_pages((unsigned long) iommu->page_table, order);
iommu->page_table = NULL;
free_pages((unsigned long) ldc_iommu->page_table, order);
ldc_iommu->page_table = NULL;
kfree(iommu->arena.map);
iommu->arena.map = NULL;
kfree(iommu->map);
iommu->map = NULL;
}
struct ldc_channel *ldc_alloc(unsigned long id,
......@@ -1140,7 +1174,7 @@ struct ldc_channel *ldc_alloc(unsigned long id,
lp->id = id;
err = ldc_iommu_init(lp);
err = ldc_iommu_init(name, lp);
if (err)
goto out_free_ldc;
......@@ -1885,40 +1919,6 @@ int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size)
}
EXPORT_SYMBOL(ldc_read);
static long arena_alloc(struct ldc_iommu *iommu, unsigned long npages)
{
struct iommu_arena *arena = &iommu->arena;
unsigned long n, start, end, limit;
int pass;
limit = arena->limit;
start = arena->hint;
pass = 0;
again:
n = bitmap_find_next_zero_area(arena->map, limit, start, npages, 0);
end = n + npages;
if (unlikely(end >= limit)) {
if (likely(pass < 1)) {
limit = start;
start = 0;
pass++;
goto again;
} else {
/* Scanned the whole thing, give up. */
return -1;
}
}
bitmap_set(arena->map, n, npages);
arena->hint = end;
return n;
}
#define COOKIE_PGSZ_CODE 0xf000000000000000ULL
#define COOKIE_PGSZ_CODE_SHIFT 60ULL
static u64 pagesize_code(void)
{
switch (PAGE_SIZE) {
......@@ -1945,23 +1945,14 @@ static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset)
page_offset);
}
static u64 cookie_to_index(u64 cookie, unsigned long *shift)
{
u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT;
cookie &= ~COOKIE_PGSZ_CODE;
*shift = szcode * 3;
return (cookie >> (13ULL + (szcode * 3ULL)));
}
static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu,
unsigned long npages)
{
long entry;
entry = arena_alloc(iommu, npages);
entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table,
npages, NULL, (unsigned long)-1, 0);
if (unlikely(entry < 0))
return NULL;
......@@ -2090,7 +2081,7 @@ int ldc_map_sg(struct ldc_channel *lp,
struct ldc_trans_cookie *cookies, int ncookies,
unsigned int map_perm)
{
unsigned long i, npages, flags;
unsigned long i, npages;
struct ldc_mtable_entry *base;
struct cookie_state state;
struct ldc_iommu *iommu;
......@@ -2109,9 +2100,7 @@ int ldc_map_sg(struct ldc_channel *lp,
iommu = &lp->iommu;
spin_lock_irqsave(&iommu->lock, flags);
base = alloc_npages(iommu, npages);
spin_unlock_irqrestore(&iommu->lock, flags);
if (!base)
return -ENOMEM;
......@@ -2136,7 +2125,7 @@ int ldc_map_single(struct ldc_channel *lp,
struct ldc_trans_cookie *cookies, int ncookies,
unsigned int map_perm)
{
unsigned long npages, pa, flags;
unsigned long npages, pa;
struct ldc_mtable_entry *base;
struct cookie_state state;
struct ldc_iommu *iommu;
......@@ -2152,9 +2141,7 @@ int ldc_map_single(struct ldc_channel *lp,
iommu = &lp->iommu;
spin_lock_irqsave(&iommu->lock, flags);
base = alloc_npages(iommu, npages);
spin_unlock_irqrestore(&iommu->lock, flags);
if (!base)
return -ENOMEM;
......@@ -2172,35 +2159,25 @@ int ldc_map_single(struct ldc_channel *lp,
}
EXPORT_SYMBOL(ldc_map_single);
static void free_npages(unsigned long id, struct ldc_iommu *iommu,
u64 cookie, u64 size)
{
struct iommu_arena *arena = &iommu->arena;
unsigned long i, shift, index, npages;
struct ldc_mtable_entry *base;
unsigned long npages, entry;
npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT;
index = cookie_to_index(cookie, &shift);
base = iommu->page_table + index;
BUG_ON(index > arena->limit ||
(index + npages) > arena->limit);
for (i = 0; i < npages; i++) {
if (base->cookie)
sun4v_ldc_revoke(id, cookie + (i << shift),
base->cookie);
base->mte = 0;
__clear_bit(index + i, arena->map);
}
entry = ldc_cookie_to_index(cookie, iommu);
ldc_demap(iommu, id, cookie, entry, npages);
iommu_tbl_range_free(&iommu->iommu_map_table, cookie, npages, entry);
}
void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
int ncookies)
{
struct ldc_iommu *iommu = &lp->iommu;
unsigned long flags;
int i;
unsigned long flags;
spin_lock_irqsave(&iommu->lock, flags);
for (i = 0; i < ncookies; i++) {
......
arch/sparc/kernel/pci_sun4v.c
View file @ ccb30186
......@@ -15,6 +15,7 @@
#include <linux/export.h>
#include <linux/log2.h>
#include <linux/of_device.h>
#include <linux/iommu-common.h>
#include <asm/iommu.h>
#include <asm/irq.h>
......@@ -155,15 +156,13 @@ static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
iommu = dev->archdata.iommu;
spin_lock_irqsave(&iommu->lock, flags);
entry = iommu_range_alloc(dev, iommu, npages, NULL);
spin_unlock_irqrestore(&iommu->lock, flags);
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages, NULL,
(unsigned long)(-1), 0);
if (unlikely(entry == DMA_ERROR_CODE))
goto range_alloc_fail;
*dma_addrp = (iommu->page_table_map_base +
(entry << IO_PAGE_SHIFT));
*dma_addrp = (iommu->tbl.table_map_base + (entry << IO_PAGE_SHIFT));
ret = (void *) first_page;
first_page = __pa(first_page);
......@@ -188,45 +187,46 @@ static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
return ret;
iommu_map_fail:
/* Interrupts are disabled. */
spin_lock(&iommu->lock);
iommu_range_free(iommu, *dma_addrp, npages);
spin_unlock_irqrestore(&iommu->lock, flags);
iommu_tbl_range_free(&iommu->tbl, *dma_addrp, npages, DMA_ERROR_CODE);
range_alloc_fail:
free_pages(first_page, order);
return NULL;
}
static void dma_4v_iommu_demap(void *demap_arg, unsigned long entry,
unsigned long npages)
{
u32 devhandle = *(u32 *)demap_arg;
unsigned long num, flags;
local_irq_save(flags);
do {
num = pci_sun4v_iommu_demap(devhandle,
HV_PCI_TSBID(0, entry),
npages);
entry += num;
npages -= num;
} while (npages != 0);
local_irq_restore(flags);
}
static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu,
dma_addr_t dvma, struct dma_attrs *attrs)
{
struct pci_pbm_info *pbm;
struct iommu *iommu;
unsigned long flags, order, npages, entry;
unsigned long order, npages, entry;
u32 devhandle;
npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT;
iommu = dev->archdata.iommu;
pbm = dev->archdata.host_controller;
devhandle = pbm->devhandle;
entry = ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
spin_lock_irqsave(&iommu->lock, flags);
iommu_range_free(iommu, dvma, npages);
do {
unsigned long num;
num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
npages);
entry += num;
npages -= num;
} while (npages != 0);
spin_unlock_irqrestore(&iommu->lock, flags);
entry = ((dvma - iommu->tbl.table_map_base) >> IO_PAGE_SHIFT);
dma_4v_iommu_demap(&devhandle, entry, npages);
iommu_tbl_range_free(&iommu->tbl, dvma, npages, DMA_ERROR_CODE);
order = get_order(size);
if (order < 10)
free_pages((unsigned long)cpu, order);
......@@ -253,15 +253,13 @@ static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page,
npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK);
npages >>= IO_PAGE_SHIFT;
spin_lock_irqsave(&iommu->lock, flags);
entry = iommu_range_alloc(dev, iommu, npages, NULL);
spin_unlock_irqrestore(&iommu->lock, flags);
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages, NULL,
(unsigned long)(-1), 0);
if (unlikely(entry == DMA_ERROR_CODE))
goto bad;
bus_addr = (iommu->page_table_map_base +
(entry << IO_PAGE_SHIFT));
bus_addr = (iommu->tbl.table_map_base + (entry << IO_PAGE_SHIFT));
ret = bus_addr | (oaddr & ~IO_PAGE_MASK);
base_paddr = __pa(oaddr & IO_PAGE_MASK);
prot = HV_PCI_MAP_ATTR_READ;
......@@ -290,11 +288,7 @@ static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page,
return DMA_ERROR_CODE;
iommu_map_fail:
/* Interrupts are disabled. */
spin_lock(&iommu->lock);
iommu_range_free(iommu, bus_addr, npages);
spin_unlock_irqrestore(&iommu->lock, flags);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, DMA_ERROR_CODE);
return DMA_ERROR_CODE;
}
......@@ -304,7 +298,7 @@ static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
{
struct pci_pbm_info *pbm;
struct iommu *iommu;
unsigned long flags, npages;
unsigned long npages;
long entry;
u32 devhandle;
......@@ -321,22 +315,9 @@ static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr,
npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK);
npages >>= IO_PAGE_SHIFT;
bus_addr &= IO_PAGE_MASK;
spin_lock_irqsave(&iommu->lock, flags);
iommu_range_free(iommu, bus_addr, npages);
entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT;
do {
unsigned long num;
num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
npages);
entry += num;
npages -= num;
} while (npages != 0);
spin_unlock_irqrestore(&iommu->lock, flags);
entry = (bus_addr - iommu->tbl.table_map_base) >> IO_PAGE_SHIFT;
dma_4v_iommu_demap(&devhandle, entry, npages);
iommu_tbl_range_free(&iommu->tbl, bus_addr, npages, DMA_ERROR_CODE);
}
static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
......@@ -371,14 +352,14 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
/* Init first segment length for backout at failure */
outs->dma_length = 0;
spin_lock_irqsave(&iommu->lock, flags);
local_irq_save(flags);
iommu_batch_start(dev, prot, ~0UL);
max_seg_size = dma_get_max_seg_size(dev);
seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
IO_PAGE_SIZE) >> IO_PAGE_SHIFT;
base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT;
base_shift = iommu->tbl.table_map_base >> IO_PAGE_SHIFT;
for_each_sg(sglist, s, nelems, i) {
unsigned long paddr, npages, entry, out_entry = 0, slen;
......@@ -391,7 +372,8 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
/* Allocate iommu entries for that segment */
paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s);
npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE);
entry = iommu_range_alloc(dev, iommu, npages, &handle);
entry = iommu_tbl_range_alloc(dev, &iommu->tbl, npages,
&handle, (unsigned long)(-1), 0);
/* Handle failure */
if (unlikely(entry == DMA_ERROR_CODE)) {
......@@ -404,8 +386,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
iommu_batch_new_entry(entry);
/* Convert entry to a dma_addr_t */
dma_addr = iommu->page_table_map_base +
(entry << IO_PAGE_SHIFT);
dma_addr = iommu->tbl.table_map_base + (entry << IO_PAGE_SHIFT);
dma_addr |= (s->offset & ~IO_PAGE_MASK);
/* Insert into HW table */
......@@ -451,7 +432,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
if (unlikely(err < 0L))
goto iommu_map_failed;
spin_unlock_irqrestore(&iommu->lock, flags);
local_irq_restore(flags);
if (outcount < incount) {
outs = sg_next(outs);
......@@ -469,7 +450,8 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
vaddr = s->dma_address & IO_PAGE_MASK;
npages = iommu_num_pages(s->dma_address, s->dma_length,
IO_PAGE_SIZE);
iommu_range_free(iommu, vaddr, npages);
iommu_tbl_range_free(&iommu->tbl, vaddr, npages,
DMA_ERROR_CODE);
/* XXX demap? XXX */
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
......@@ -477,7 +459,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
if (s == outs)
break;
}
spin_unlock_irqrestore(&iommu->lock, flags);
local_irq_restore(flags);
return 0;
}
......@@ -489,7 +471,7 @@ static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
struct pci_pbm_info *pbm;
struct scatterlist *sg;
struct iommu *iommu;
unsigned long flags;
unsigned long flags, entry;
u32 devhandle;
BUG_ON(direction == DMA_NONE);
......@@ -498,33 +480,27 @@ static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
pbm = dev->archdata.host_controller;
devhandle = pbm->devhandle;
spin_lock_irqsave(&iommu->lock, flags);
local_irq_save(flags);
sg = sglist;
while (nelems--) {
dma_addr_t dma_handle = sg->dma_address;
unsigned int len = sg->dma_length;
unsigned long npages, entry;
unsigned long npages;
struct iommu_map_table *tbl = &iommu->tbl;
unsigned long shift = IO_PAGE_SHIFT;
if (!len)
break;
npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE);
iommu_range_free(iommu, dma_handle, npages);
entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT);
while (npages) {
unsigned long num;
num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry),
npages);
entry += num;
npages -= num;
}
entry = ((dma_handle - tbl->table_map_base) >> shift);
dma_4v_iommu_demap(&devhandle, entry, npages);
iommu_tbl_range_free(&iommu->tbl, dma_handle, npages,
DMA_ERROR_CODE);
sg = sg_next(sg);
}
spin_unlock_irqrestore(&iommu->lock, flags);
local_irq_restore(flags);
}
static struct dma_map_ops sun4v_dma_ops = {
......@@ -550,14 +526,16 @@ static void pci_sun4v_scan_bus(struct pci_pbm_info *pbm, struct device *parent)
}
static unsigned long probe_existing_entries(struct pci_pbm_info *pbm,
struct iommu *iommu)
struct iommu_map_table *iommu)
{
struct iommu_arena *arena = &iommu->arena;
unsigned long i, cnt = 0;
struct iommu_pool *pool;
unsigned long i, pool_nr, cnt = 0;
u32 devhandle;
devhandle = pbm->devhandle;
for (i = 0; i < arena->limit; i++) {
for (pool_nr = 0; pool_nr < iommu->nr_pools; pool_nr++) {
pool = &(iommu->pools[pool_nr]);
for (i = pool->start; i <= pool->end; i++) {
unsigned long ret, io_attrs, ra;
ret = pci_sun4v_iommu_getmap(devhandle,
......@@ -566,14 +544,15 @@ static unsigned long probe_existing_entries(struct pci_pbm_info *pbm,
if (ret == HV_EOK) {
if (page_in_phys_avail(ra)) {
pci_sun4v_iommu_demap(devhandle,
HV_PCI_TSBID(0, i), 1);
HV_PCI_TSBID(0,
i), 1);
} else {
cnt++;
__set_bit(i, arena->map);
__set_bit(i, iommu->map);
}
}
}
}
return cnt;
}
......@@ -603,20 +582,22 @@ static int pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
/* Setup initial software IOMMU state. */
spin_lock_init(&iommu->lock);
iommu->ctx_lowest_free = 1;
iommu->page_table_map_base = dma_offset;
iommu->tbl.table_map_base = dma_offset;
iommu->dma_addr_mask = dma_mask;
/* Allocate and initialize the free area map. */
sz = (num_tsb_entries + 7) / 8;
sz = (sz + 7UL) & ~7UL;
iommu->arena.map = kzalloc(sz, GFP_KERNEL);
if (!iommu->arena.map) {
iommu->tbl.map = kzalloc(sz, GFP_KERNEL);
if (!iommu->tbl.map) {
printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n");
return -ENOMEM;
}
iommu->arena.limit = num_tsb_entries;
sz = probe_existing_entries(pbm, iommu);
iommu_tbl_pool_init(&iommu->tbl, num_tsb_entries, IO_PAGE_SHIFT,
NULL, false /* no large_pool */,
0 /* default npools */,
false /* want span boundary checking */);
sz = probe_existing_entries(pbm, &iommu->tbl);
if (sz)
printk("%s: Imported %lu TSB entries from OBP\n",
pbm->name, sz);
......
include/linux/iommu-common.h 0 → 100644
View file @ ccb30186
#ifndef _LINUX_IOMMU_COMMON_H
#define _LINUX_IOMMU_COMMON_H
#include <linux/spinlock_types.h>
#include <linux/device.h>
#include <asm/page.h>
#define IOMMU_POOL_HASHBITS 4
#define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS)
struct iommu_pool {
unsigned long start;
unsigned long end;
unsigned long hint;
spinlock_t lock;
};
struct iommu_map_table {
unsigned long table_map_base;
unsigned long table_shift;
unsigned long nr_pools;
void (*lazy_flush)(struct iommu_map_table *);
unsigned long poolsize;
struct iommu_pool pools[IOMMU_NR_POOLS];
u32 flags;
#define IOMMU_HAS_LARGE_POOL 0x00000001
#define IOMMU_NO_SPAN_BOUND 0x00000002
#define IOMMU_NEED_FLUSH 0x00000004
struct iommu_pool large_pool;
unsigned long *map;
};
extern void iommu_tbl_pool_init(struct iommu_map_table *iommu,
unsigned long num_entries,
u32 table_shift,
void (*lazy_flush)(struct iommu_map_table *),
bool large_pool, u32 npools,
bool skip_span_boundary_check);
extern unsigned long iommu_tbl_range_alloc(struct device *dev,
struct iommu_map_table *iommu,
unsigned long npages,
unsigned long *handle,
unsigned long mask,
unsigned int align_order);
extern void iommu_tbl_range_free(struct iommu_map_table *iommu,
u64 dma_addr, unsigned long npages,
unsigned long entry);
#endif
lib/Makefile
View file @ ccb30186
......@@ -106,7 +106,7 @@ obj-$(CONFIG_AUDIT_GENERIC) += audit.o
obj-$(CONFIG_AUDIT_COMPAT_GENERIC) += compat_audit.o
obj-$(CONFIG_SWIOTLB) += swiotlb.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o iommu-common.o
obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o
......
lib/iommu-common.c 0 → 100644
View file @ ccb30186
/*
* IOMMU mmap management and range allocation functions.
* Based almost entirely upon the powerpc iommu allocator.
*/
#include <linux/export.h>
#include <linux/bitmap.h>
#include <linux/bug.h>
#include <linux/iommu-helper.h>
#include <linux/iommu-common.h>
#include <linux/dma-mapping.h>
#include <linux/hash.h>
#ifndef DMA_ERROR_CODE
#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
#endif
unsigned long iommu_large_alloc = 15;
static DEFINE_PER_CPU(unsigned int, iommu_pool_hash);
static inline bool need_flush(struct iommu_map_table *iommu)
{
return (iommu->lazy_flush != NULL &&
(iommu->flags & IOMMU_NEED_FLUSH) != 0);
}
static inline void set_flush(struct iommu_map_table *iommu)
{
iommu->flags |= IOMMU_NEED_FLUSH;
}
static inline void clear_flush(struct iommu_map_table *iommu)
{
iommu->flags &= ~IOMMU_NEED_FLUSH;
}
static void setup_iommu_pool_hash(void)
{
unsigned int i;
static bool do_once;
if (do_once)
return;
do_once = true;
for_each_possible_cpu(i)
per_cpu(iommu_pool_hash, i) = hash_32(i, IOMMU_POOL_HASHBITS);
}
/*
* Initialize iommu_pool entries for the iommu_map_table. `num_entries'
* is the number of table entries. If `large_pool' is set to true,
* the top 1/4 of the table will be set aside for pool allocations
* of more than iommu_large_alloc pages.
*/
extern void iommu_tbl_pool_init(struct iommu_map_table *iommu,
unsigned long num_entries,
u32 table_shift,
void (*lazy_flush)(struct iommu_map_table *),
bool large_pool, u32 npools,
bool skip_span_boundary_check)
{
unsigned int start, i;
struct iommu_pool *p = &(iommu->large_pool);
setup_iommu_pool_hash();
if (npools == 0)
iommu->nr_pools = IOMMU_NR_POOLS;
else
iommu->nr_pools = npools;
BUG_ON(npools > IOMMU_NR_POOLS);
iommu->table_shift = table_shift;
iommu->lazy_flush = lazy_flush;
start = 0;
if (skip_span_boundary_check)
iommu->flags |= IOMMU_NO_SPAN_BOUND;
if (large_pool)
iommu->flags |= IOMMU_HAS_LARGE_POOL;
if (!large_pool)
iommu->poolsize = num_entries/iommu->nr_pools;
else
iommu->poolsize = (num_entries * 3 / 4)/iommu->nr_pools;
for (i = 0; i < iommu->nr_pools; i++) {
spin_lock_init(&(iommu->pools[i].lock));
iommu->pools[i].start = start;
iommu->pools[i].hint = start;
start += iommu->poolsize; /* start for next pool */
iommu->pools[i].end = start - 1;
}
if (!large_pool)
return;
/* initialize large_pool */
spin_lock_init(&(p->lock));
p->start = start;
p->hint = p->start;
p->end = num_entries;
}
EXPORT_SYMBOL(iommu_tbl_pool_init);
unsigned long iommu_tbl_range_alloc(struct device *dev,
struct iommu_map_table *iommu,
unsigned long npages,
unsigned long *handle,
unsigned long mask,
unsigned int align_order)
{
unsigned int pool_hash = __this_cpu_read(iommu_pool_hash);
unsigned long n, end, start, limit, boundary_size;
struct iommu_pool *pool;
int pass = 0;
unsigned int pool_nr;
unsigned int npools = iommu->nr_pools;
unsigned long flags;
bool large_pool = ((iommu->flags & IOMMU_HAS_LARGE_POOL) != 0);
bool largealloc = (large_pool && npages > iommu_large_alloc);
unsigned long shift;
unsigned long align_mask = 0;
if (align_order > 0)
align_mask = 0xffffffffffffffffl >> (64 - align_order);
/* Sanity check */
if (unlikely(npages == 0)) {
WARN_ON_ONCE(1);
return DMA_ERROR_CODE;
}
if (largealloc) {
pool = &(iommu->large_pool);
pool_nr = 0; /* to keep compiler happy */
} else {
/* pick out pool_nr */
pool_nr = pool_hash & (npools - 1);
pool = &(iommu->pools[pool_nr]);
}
spin_lock_irqsave(&pool->lock, flags);
again:
if (pass == 0 && handle && *handle &&
(*handle >= pool->start) && (*handle < pool->end))
start = *handle;
else
start = pool->hint;
limit = pool->end;
/* The case below can happen if we have a small segment appended
* to a large, or when the previous alloc was at the very end of
* the available space. If so, go back to the beginning. If a
* flush is needed, it will get done based on the return value
* from iommu_area_alloc() below.
*/
if (start >= limit)
start = pool->start;
shift = iommu->table_map_base >> iommu->table_shift;
if (limit + shift > mask) {
limit = mask - shift + 1;
/* If we're constrained on address range, first try
* at the masked hint to avoid O(n) search complexity,
* but on second pass, start at 0 in pool 0.
*/
if ((start & mask) >= limit || pass > 0) {
spin_unlock(&(pool->lock));
pool = &(iommu->pools[0]);
spin_lock(&(pool->lock));
start = pool->start;
} else {
start &= mask;
}
}
if (dev)
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
1 << iommu->table_shift);
else
boundary_size = ALIGN(1ULL << 32, 1 << iommu->table_shift);
boundary_size = boundary_size >> iommu->table_shift;
/*
* if the skip_span_boundary_check had been set during init, we set
* things up so that iommu_is_span_boundary() merely checks if the
* (index + npages) < num_tsb_entries
*/
if ((iommu->flags & IOMMU_NO_SPAN_BOUND) != 0) {
shift = 0;
boundary_size = iommu->poolsize * iommu->nr_pools;
}
n = iommu_area_alloc(iommu->map, limit, start, npages, shift,
boundary_size, align_mask);
if (n == -1) {
if (likely(pass == 0)) {
/* First failure, rescan from the beginning. */
pool->hint = pool->start;
set_flush(iommu);
pass++;
goto again;
} else if (!largealloc && pass <= iommu->nr_pools) {
spin_unlock(&(pool->lock));
pool_nr = (pool_nr + 1) & (iommu->nr_pools - 1);
pool = &(iommu->pools[pool_nr]);
spin_lock(&(pool->lock));
pool->hint = pool->start;
set_flush(iommu);
pass++;
goto again;
} else {
/* give up */
n = DMA_ERROR_CODE;
goto bail;
}
}
if (n < pool->hint || need_flush(iommu)) {
clear_flush(iommu);
iommu->lazy_flush(iommu);
}
end = n + npages;
pool->hint = end;
/* Update handle for SG allocations */
if (handle)
*handle = end;
bail:
spin_unlock_irqrestore(&(pool->lock), flags);
return n;
}
EXPORT_SYMBOL(iommu_tbl_range_alloc);
static struct iommu_pool *get_pool(struct iommu_map_table *tbl,
unsigned long entry)
{
struct iommu_pool *p;
unsigned long largepool_start = tbl->large_pool.start;
bool large_pool = ((tbl->flags & IOMMU_HAS_LARGE_POOL) != 0);
/* The large pool is the last pool at the top of the table */
if (large_pool && entry >= largepool_start) {
p = &tbl->large_pool;
} else {
unsigned int pool_nr = entry / tbl->poolsize;
BUG_ON(pool_nr >= tbl->nr_pools);
p = &tbl->pools[pool_nr];
}
return p;
}
/* Caller supplies the index of the entry into the iommu map table
* itself when the mapping from dma_addr to the entry is not the
* default addr->entry mapping below.
*/
void iommu_tbl_range_free(struct iommu_map_table *iommu, u64 dma_addr,
unsigned long npages, unsigned long entry)
{
struct iommu_pool *pool;
unsigned long flags;
unsigned long shift = iommu->table_shift;
if (entry == DMA_ERROR_CODE) /* use default addr->entry mapping */
entry = (dma_addr - iommu->table_map_base) >> shift;
pool = get_pool(iommu, entry);
spin_lock_irqsave(&(pool->lock), flags);
bitmap_clear(iommu->map, entry, npages);
spin_unlock_irqrestore(&(pool->lock), flags);
}
EXPORT_SYMBOL(iommu_tbl_range_free);
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