diff options
| author | Chris Metcalf <cmetcalf@tilera.com> | 2011-02-28 15:48:39 -0500 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2011-03-01 16:21:06 -0500 |
| commit | 63b7ca6b04427aea9075d6f5f5f15b82e115bce4 (patch) | |
| tree | 97a72ec3d243a46475e880b2c5703a167165f961 /arch/tile/mm/homecache.c | |
| parent | 3cebbafd28e6f91677f3becffcdf9150b74a4e0c (diff) | |
arch/tile: enhance existing finv_buffer_remote() routine
It now takes an additional argument so it can be used to
flush-and-invalidate pages that are cached using hash-for-home
as well those that are cached with coherence point on a single cpu.
This allows it to be used more widely for changing the coherence
point of arbitrary pages when necessary.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/mm/homecache.c')
| -rw-r--r-- | arch/tile/mm/homecache.c | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/arch/tile/mm/homecache.c b/arch/tile/mm/homecache.c index d78df3a6ee15..f344f4fc7342 100644 --- a/arch/tile/mm/homecache.c +++ b/arch/tile/mm/homecache.c @@ -179,23 +179,46 @@ void flush_remote(unsigned long cache_pfn, unsigned long cache_control, panic("Unsafe to continue."); } +void flush_remote_page(struct page *page, int order) +{ + int i, pages = (1 << order); + for (i = 0; i < pages; ++i, ++page) { + void *p = kmap_atomic(page); + int hfh = 0; + int home = page_home(page); +#if CHIP_HAS_CBOX_HOME_MAP() + if (home == PAGE_HOME_HASH) + hfh = 1; + else +#endif + BUG_ON(home < 0 || home >= NR_CPUS); + finv_buffer_remote(p, PAGE_SIZE, hfh); + kunmap_atomic(p); + } +} + void homecache_evict(const struct cpumask *mask) { flush_remote(0, HV_FLUSH_EVICT_L2, mask, 0, 0, 0, NULL, NULL, 0); } -/* Return a mask of the cpus whose caches currently own these pages. */ -static void homecache_mask(struct page *page, int pages, - struct cpumask *home_mask) +/* + * Return a mask of the cpus whose caches currently own these pages. + * The return value is whether the pages are all coherently cached + * (i.e. none are immutable, incoherent, or uncached). + */ +static int homecache_mask(struct page *page, int pages, + struct cpumask *home_mask) { int i; + int cached_coherently = 1; cpumask_clear(home_mask); for (i = 0; i < pages; ++i) { int home = page_home(&page[i]); if (home == PAGE_HOME_IMMUTABLE || home == PAGE_HOME_INCOHERENT) { cpumask_copy(home_mask, cpu_possible_mask); - return; + return 0; } #if CHIP_HAS_CBOX_HOME_MAP() if (home == PAGE_HOME_HASH) { @@ -203,11 +226,14 @@ static void homecache_mask(struct page *page, int pages, continue; } #endif - if (home == PAGE_HOME_UNCACHED) + if (home == PAGE_HOME_UNCACHED) { + cached_coherently = 0; continue; + } BUG_ON(home < 0 || home >= NR_CPUS); cpumask_set_cpu(home, home_mask); } + return cached_coherently; } /* |