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authorRalf Baechle <ralf@linux-mips.org>2006-05-12 13:20:06 +0100
committerRalf Baechle <ralf@linux-mips.org>2006-06-01 00:28:33 +0100
commit7f3f1d01a9020cff2cb2390aaee3f8df0d70e203 (patch)
tree222c7f054eccce1b98fac8ceafa8dde2afd6b63f /arch
parent78665aaa96fe62b4cee6c226680801c4480aa407 (diff)
downloadop-kernel-dev-7f3f1d01a9020cff2cb2390aaee3f8df0d70e203.zip
op-kernel-dev-7f3f1d01a9020cff2cb2390aaee3f8df0d70e203.tar.gz
[MIPS] Fix deadlock on MP with cache aliases.
A proper fix would involve introducing the notion of shared caches but at this stage of 2.6.17 that's going to be too intrusive and not needed for current hardware; aside I think some discussion will be needed. So for now on the affected SMP configurations which happen to suffer from cache aliases we make use of the fact that a single cache will be shared by all processors. This solves the deadlock issue and will improve performance by getting rid of the smp_call_function overhead. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/mm/c-r4k.c39
1 files changed, 30 insertions, 9 deletions
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 4420191..570bc4e 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -29,6 +29,27 @@
#include <asm/war.h>
#include <asm/cacheflush.h> /* for run_uncached() */
+
+/*
+ * Special Variant of smp_call_function for use by cache functions:
+ *
+ * o No return value
+ * o collapses to normal function call on UP kernels
+ * o collapses to normal function call on systems with a single shared
+ * primary cache.
+ */
+static inline void r4k_on_each_cpu(void (*func) (void *info), void *info,
+ int retry, int wait)
+{
+ preempt_disable();
+
+#if !defined(CONFIG_MIPS_MT_SMP) && !defined(CONFIG_MIPS_MT_SMTC)
+ smp_call_function(func, info, retry, wait);
+#endif
+ func(info);
+ preempt_enable();
+}
+
/*
* Must die.
*/
@@ -299,7 +320,7 @@ static void r4k_flush_cache_all(void)
if (!cpu_has_dc_aliases)
return;
- on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_cache_all, NULL, 1, 1);
}
static inline void local_r4k___flush_cache_all(void * args)
@@ -320,7 +341,7 @@ static inline void local_r4k___flush_cache_all(void * args)
static void r4k___flush_cache_all(void)
{
- on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
+ r4k_on_each_cpu(local_r4k___flush_cache_all, NULL, 1, 1);
}
static inline void local_r4k_flush_cache_range(void * args)
@@ -341,7 +362,7 @@ static inline void local_r4k_flush_cache_range(void * args)
static void r4k_flush_cache_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
- on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_cache_range, vma, 1, 1);
}
static inline void local_r4k_flush_cache_mm(void * args)
@@ -370,7 +391,7 @@ static void r4k_flush_cache_mm(struct mm_struct *mm)
if (!cpu_has_dc_aliases)
return;
- on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_cache_mm, mm, 1, 1);
}
struct flush_cache_page_args {
@@ -461,7 +482,7 @@ static void r4k_flush_cache_page(struct vm_area_struct *vma,
args.addr = addr;
args.pfn = pfn;
- on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_cache_page, &args, 1, 1);
}
static inline void local_r4k_flush_data_cache_page(void * addr)
@@ -471,7 +492,7 @@ static inline void local_r4k_flush_data_cache_page(void * addr)
static void r4k_flush_data_cache_page(unsigned long addr)
{
- on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_data_cache_page, (void *) addr, 1, 1);
}
struct flush_icache_range_args {
@@ -514,7 +535,7 @@ static void r4k_flush_icache_range(unsigned long start, unsigned long end)
args.start = start;
args.end = end;
- on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_icache_range, &args, 1, 1);
instruction_hazard();
}
@@ -590,7 +611,7 @@ static void r4k_flush_icache_page(struct vm_area_struct *vma,
args.vma = vma;
args.page = page;
- on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_icache_page, &args, 1, 1);
}
@@ -689,7 +710,7 @@ static void local_r4k_flush_cache_sigtramp(void * arg)
static void r4k_flush_cache_sigtramp(unsigned long addr)
{
- on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
+ r4k_on_each_cpu(local_r4k_flush_cache_sigtramp, (void *) addr, 1, 1);
}
static void r4k_flush_icache_all(void)
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