[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>
diff --git a/arch/ia64/kernel/uncached.c b/arch/ia64/kernel/uncached.c
index 5f03b9e..4c73a67 100644
--- a/arch/ia64/kernel/uncached.c
+++ b/arch/ia64/kernel/uncached.c
@@ -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 @@
* 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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);