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[IA64] make uncached allocator more node aware 

The uncached allocator has a function, uncached_get_new_chunk(), that needs
to be serialized on a per node basis. It also has a global variable,
allocated_granules, which should be defined on a per node basis and protected
by that serialization. Additionally, all error returns from functions called
(like ia64_pal_mc_drain()) should be handled appropriately.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Acked-by: Jes Sorenson <jes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Dean Nelson 2006-06-28 13:50:09 -05:00 committed by Tony Luck
parent efe78cda35
commit eca7994f60
1 changed files with 57 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
arch/ia64/kernel/uncached.c
View File

@ -32,32 +32,38 @@
extern void __init efi_memmap_walk_uc(efi_freemem_callback_t, void *);
#define MAX_UNCACHED_GRANULES 5
static int allocated_granules;
struct uncached_pool {
struct gen_pool *pool;
struct mutex add_chunk_mutex; /* serialize adding a converted chunk */
int nchunks_added; /* #of converted chunks added to pool */
atomic_t status; /* smp called function's return status*/
};
struct gen_pool *uncached_pool[MAX_NUMNODES];
#define MAX_CONVERTED_CHUNKS_PER_NODE 2
struct uncached_pool uncached_pools[MAX_NUMNODES];
static void uncached_ipi_visibility(void *data)
{
int status;
struct uncached_pool *uc_pool = (struct uncached_pool *)data;
status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL);
if ((status != PAL_VISIBILITY_OK) &&
(status != PAL_VISIBILITY_OK_REMOTE_NEEDED))
printk(KERN_DEBUG "pal_prefetch_visibility() returns %i on "
"CPU %i\n", status, raw_smp_processor_id());
atomic_inc(&uc_pool->status);
}
static void uncached_ipi_mc_drain(void *data)
{
int status;
struct uncached_pool *uc_pool = (struct uncached_pool *)data;
status = ia64_pal_mc_drain();
if (status)
printk(KERN_WARNING "ia64_pal_mc_drain() failed with %i on "
"CPU %i\n", status, raw_smp_processor_id());
if (status != PAL_STATUS_SUCCESS)
atomic_inc(&uc_pool->status);
}
@ -70,21 +76,34 @@ static void uncached_ipi_mc_drain(void *data)
* This is accomplished by first allocating a granule of cached memory pages
* and then converting them to uncached memory pages.
*/
static int uncached_add_chunk(struct gen_pool *pool, int nid)
static int uncached_add_chunk(struct uncached_pool *uc_pool, int nid)
{
struct page *page;
int status, i;
int status, i, nchunks_added = uc_pool->nchunks_added;
unsigned long c_addr, uc_addr;
if (allocated_granules >= MAX_UNCACHED_GRANULES)
if (mutex_lock_interruptible(&uc_pool->add_chunk_mutex) != 0)
return -1; /* interrupted by a signal */
if (uc_pool->nchunks_added > nchunks_added) {
/* someone added a new chunk while we were waiting */
mutex_unlock(&uc_pool->add_chunk_mutex);
return 0;
}
if (uc_pool->nchunks_added >= MAX_CONVERTED_CHUNKS_PER_NODE) {
mutex_unlock(&uc_pool->add_chunk_mutex);
return -1;
}
/* attempt to allocate a granule's worth of cached memory pages */
page = alloc_pages_node(nid, GFP_KERNEL | __GFP_ZERO,
IA64_GRANULE_SHIFT-PAGE_SHIFT);
if (!page)
if (!page) {
mutex_unlock(&uc_pool->add_chunk_mutex);
return -1;
}
/* convert the memory pages from cached to uncached */
@ -102,11 +121,14 @@ static int uncached_add_chunk(struct gen_pool *pool, int nid)
flush_tlb_kernel_range(uc_addr, uc_adddr + IA64_GRANULE_SIZE);
status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL);
if (!status) {
status = smp_call_function(uncached_ipi_visibility, NULL, 0, 1);
if (status)
if (status == PAL_VISIBILITY_OK_REMOTE_NEEDED) {
atomic_set(&uc_pool->status, 0);
status = smp_call_function(uncached_ipi_visibility, uc_pool,
0, 1);
if (status || atomic_read(&uc_pool->status))
goto failed;
}
} else if (status != PAL_VISIBILITY_OK)
goto failed;
preempt_disable();
@ -120,20 +142,24 @@ static int uncached_add_chunk(struct gen_pool *pool, int nid)
preempt_enable();
ia64_pal_mc_drain();
status = smp_call_function(uncached_ipi_mc_drain, NULL, 0, 1);
if (status)
status = ia64_pal_mc_drain();
if (status != PAL_STATUS_SUCCESS)
goto failed;
atomic_set(&uc_pool->status, 0);
status = smp_call_function(uncached_ipi_mc_drain, uc_pool, 0, 1);
if (status || atomic_read(&uc_pool->status))
goto failed;
/*
* The chunk of memory pages has been converted to uncached so now we
* can add it to the pool.
*/
status = gen_pool_add(pool, uc_addr, IA64_GRANULE_SIZE, nid);
status = gen_pool_add(uc_pool->pool, uc_addr, IA64_GRANULE_SIZE, nid);
if (status)
goto failed;
allocated_granules++;
uc_pool->nchunks_added++;
mutex_unlock(&uc_pool->add_chunk_mutex);
return 0;
/* failed to convert or add the chunk so give it back to the kernel */
@ -142,6 +168,7 @@ failed:
ClearPageUncached(&page[i]);
free_pages(c_addr, IA64_GRANULE_SHIFT-PAGE_SHIFT);
mutex_unlock(&uc_pool->add_chunk_mutex);
return -1;
}
@ -158,7 +185,7 @@ failed:
unsigned long uncached_alloc_page(int starting_nid)
{
unsigned long uc_addr;
struct gen_pool *pool;
struct uncached_pool *uc_pool;
int nid;
if (unlikely(starting_nid >= MAX_NUMNODES))
@ -171,14 +198,14 @@ unsigned long uncached_alloc_page(int starting_nid)
do {
if (!node_online(nid))
continue;
pool = uncached_pool[nid];
if (pool == NULL)
uc_pool = &uncached_pools[nid];
if (uc_pool->pool == NULL)
continue;
do {
uc_addr = gen_pool_alloc(pool, PAGE_SIZE);
uc_addr = gen_pool_alloc(uc_pool->pool, PAGE_SIZE);
if (uc_addr != 0)
return uc_addr;
} while (uncached_add_chunk(pool, nid) == 0);
} while (uncached_add_chunk(uc_pool, nid) == 0);
} while ((nid = (nid + 1) % MAX_NUMNODES) != starting_nid);
@ -197,7 +224,7 @@ EXPORT_SYMBOL(uncached_alloc_page);
void uncached_free_page(unsigned long uc_addr)
{
int nid = paddr_to_nid(uc_addr - __IA64_UNCACHED_OFFSET);
struct gen_pool *pool = uncached_pool[nid];
struct gen_pool *pool = uncached_pools[nid].pool;
if (unlikely(pool == NULL))
return;
@ -224,7 +251,7 @@ static int __init uncached_build_memmap(unsigned long uc_start,
unsigned long uc_end, void *arg)
{
int nid = paddr_to_nid(uc_start - __IA64_UNCACHED_OFFSET);
struct gen_pool *pool = uncached_pool[nid];
struct gen_pool *pool = uncached_pools[nid].pool;
size_t size = uc_end - uc_start;
touch_softlockup_watchdog();
@ -242,7 +269,8 @@ static int __init uncached_init(void)
int nid;
for_each_online_node(nid) {
uncached_pool[nid] = gen_pool_create(PAGE_SHIFT, nid);
uncached_pools[nid].pool = gen_pool_create(PAGE_SHIFT, nid);
mutex_init(&uncached_pools[nid].add_chunk_mutex);
}
efi_memmap_walk_uc(uncached_build_memmap, NULL);