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Merge remote-tracking branch 'sstabellini/xen-2013-04-03' into staging 

# By Hanweidong (1) and Stefano Stabellini (1)
# Via Stefano Stabellini
* sstabellini/xen-2013-04-03:
  xen-mapcache: pass the right size argument to test_bits
  xen-mapcache: replace last_address_index with a last_entry pointer
This commit is contained in:
Anthony Liguori 2013-04-03 15:05:52 -05:00
parent 162cbbd173 044d4e1aae
commit eabb21aac9
1 changed files with 37 additions and 21 deletions
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58
xen-mapcache.c
View File

@ -74,8 +74,7 @@ typedef struct MapCache {
QTAILQ_HEAD(map_cache_head, MapCacheRev) locked_entries;
/* For most cases (>99.9%), the page address is the same. */
hwaddr last_address_index;
uint8_t *last_address_vaddr;
MapCacheEntry *last_entry;
unsigned long max_mcache_size;
unsigned int mcache_bucket_shift;
@ -105,7 +104,6 @@ void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
mapcache->opaque = opaque;
QTAILQ_INIT(&mapcache->locked_entries);
mapcache->last_address_index = -1;
if (geteuid() == 0) {
rlimit_as.rlim_cur = RLIM_INFINITY;
@ -202,6 +200,7 @@ uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
hwaddr address_index;
hwaddr address_offset;
hwaddr __size = size;
hwaddr __test_bit_size = size;
bool translated = false;
tryagain:
@ -210,9 +209,25 @@ tryagain:
trace_xen_map_cache(phys_addr);
if (address_index == mapcache->last_address_index && !lock && !__size) {
trace_xen_map_cache_return(mapcache->last_address_vaddr + address_offset);
return mapcache->last_address_vaddr + address_offset;
/* __test_bit_size is always a multiple of XC_PAGE_SIZE */
if (size) {
__test_bit_size = size + (phys_addr & (XC_PAGE_SIZE - 1));
if (__test_bit_size % XC_PAGE_SIZE) {
__test_bit_size += XC_PAGE_SIZE - (__test_bit_size % XC_PAGE_SIZE);
}
} else {
__test_bit_size = XC_PAGE_SIZE;
}
if (mapcache->last_entry != NULL &&
mapcache->last_entry->paddr_index == address_index &&
!lock && !__size &&
test_bits(address_offset >> XC_PAGE_SHIFT,
__test_bit_size >> XC_PAGE_SHIFT,
mapcache->last_entry->valid_mapping)) {
trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
return mapcache->last_entry->vaddr_base + address_offset;
}
/* size is always a multiple of MCACHE_BUCKET_SIZE */
@ -229,7 +244,8 @@ tryagain:
while (entry && entry->lock && entry->vaddr_base &&
(entry->paddr_index != address_index || entry->size != __size ||
!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT,
!test_bits(address_offset >> XC_PAGE_SHIFT,
__test_bit_size >> XC_PAGE_SHIFT,
entry->valid_mapping))) {
pentry = entry;
entry = entry->next;
@ -241,15 +257,17 @@ tryagain:
} else if (!entry->lock) {
if (!entry->vaddr_base || entry->paddr_index != address_index ||
entry->size != __size ||
!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT,
!test_bits(address_offset >> XC_PAGE_SHIFT,
__test_bit_size >> XC_PAGE_SHIFT,
entry->valid_mapping)) {
xen_remap_bucket(entry, __size, address_index);
}
}
if(!test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT,
if(!test_bits(address_offset >> XC_PAGE_SHIFT,
__test_bit_size >> XC_PAGE_SHIFT,
entry->valid_mapping)) {
mapcache->last_address_index = -1;
mapcache->last_entry = NULL;
if (!translated && mapcache->phys_offset_to_gaddr) {
phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque);
translated = true;
@ -259,19 +277,18 @@ tryagain:
return NULL;
}
mapcache->last_address_index = address_index;
mapcache->last_address_vaddr = entry->vaddr_base;
mapcache->last_entry = entry;
if (lock) {
MapCacheRev *reventry = g_malloc0(sizeof(MapCacheRev));
entry->lock++;
reventry->vaddr_req = mapcache->last_address_vaddr + address_offset;
reventry->paddr_index = mapcache->last_address_index;
reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset;
reventry->paddr_index = mapcache->last_entry->paddr_index;
reventry->size = entry->size;
QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
}
trace_xen_map_cache_return(mapcache->last_address_vaddr + address_offset);
return mapcache->last_address_vaddr + address_offset;
trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
return mapcache->last_entry->vaddr_base + address_offset;
}
ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
@ -338,9 +355,9 @@ void xen_invalidate_map_cache_entry(uint8_t *buffer)
QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next);
g_free(reventry);
if (mapcache->last_address_index == paddr_index) {
mapcache->last_address_index = -1;
mapcache->last_address_vaddr = NULL;
if (mapcache->last_entry != NULL &&
mapcache->last_entry->paddr_index == paddr_index) {
mapcache->last_entry = NULL;
}
entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
@ -404,8 +421,7 @@ void xen_invalidate_map_cache(void)
entry->valid_mapping = NULL;
}
mapcache->last_address_index = -1;
mapcache->last_address_vaddr = NULL;
mapcache->last_entry = NULL;
mapcache_unlock();
}