diff options
author | Paul Mundt <lethal@linux-sh.org> | 2010-12-01 01:39:51 -0500 |
---|---|---|
committer | Paul Mundt <lethal@linux-sh.org> | 2010-12-01 01:39:51 -0500 |
commit | 55661fc1f105ed75852e937bf8ea408270eb0cca (patch) | |
tree | aa96c0c6dd0a8230f9373cab32cd069564d27d23 /arch/sh/mm/cache.c | |
parent | 22a5b566c8c442b0b35b3b106795e2f2b3578096 (diff) |
sh: Assume new page cache pages have dirty dcache lines.
This follows the ARM change c01778001a4f5ad9c62d882776235f3f31922fdd
("ARM: 6379/1: Assume new page cache pages have dirty D-cache") for the
same rationale:
There are places in Linux where writes to newly allocated page
cache pages happen without a subsequent call to flush_dcache_page()
(several PIO drivers including USB HCD). This patch changes the
meaning of PG_arch_1 to be PG_dcache_clean and always flush the
D-cache for a newly mapped page in update_mmu_cache().
This addresses issues seen with executing binaries from MMC, in
addition to some of the other HCDs that don't explicitly do cache
management for their pipe-in buffers.
Requested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm/cache.c')
-rw-r--r-- | arch/sh/mm/cache.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c index ba401d137bb9..88d3dc3d30d5 100644 --- a/arch/sh/mm/cache.c +++ b/arch/sh/mm/cache.c | |||
@@ -60,14 +60,14 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page, | |||
60 | unsigned long len) | 60 | unsigned long len) |
61 | { | 61 | { |
62 | if (boot_cpu_data.dcache.n_aliases && page_mapped(page) && | 62 | if (boot_cpu_data.dcache.n_aliases && page_mapped(page) && |
63 | !test_bit(PG_dcache_dirty, &page->flags)) { | 63 | test_bit(PG_dcache_clean, &page->flags)) { |
64 | void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); | 64 | void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
65 | memcpy(vto, src, len); | 65 | memcpy(vto, src, len); |
66 | kunmap_coherent(vto); | 66 | kunmap_coherent(vto); |
67 | } else { | 67 | } else { |
68 | memcpy(dst, src, len); | 68 | memcpy(dst, src, len); |
69 | if (boot_cpu_data.dcache.n_aliases) | 69 | if (boot_cpu_data.dcache.n_aliases) |
70 | set_bit(PG_dcache_dirty, &page->flags); | 70 | clear_bit(PG_dcache_clean, &page->flags); |
71 | } | 71 | } |
72 | 72 | ||
73 | if (vma->vm_flags & VM_EXEC) | 73 | if (vma->vm_flags & VM_EXEC) |
@@ -79,14 +79,14 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page, | |||
79 | unsigned long len) | 79 | unsigned long len) |
80 | { | 80 | { |
81 | if (boot_cpu_data.dcache.n_aliases && page_mapped(page) && | 81 | if (boot_cpu_data.dcache.n_aliases && page_mapped(page) && |
82 | !test_bit(PG_dcache_dirty, &page->flags)) { | 82 | test_bit(PG_dcache_clean, &page->flags)) { |
83 | void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); | 83 | void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
84 | memcpy(dst, vfrom, len); | 84 | memcpy(dst, vfrom, len); |
85 | kunmap_coherent(vfrom); | 85 | kunmap_coherent(vfrom); |
86 | } else { | 86 | } else { |
87 | memcpy(dst, src, len); | 87 | memcpy(dst, src, len); |
88 | if (boot_cpu_data.dcache.n_aliases) | 88 | if (boot_cpu_data.dcache.n_aliases) |
89 | set_bit(PG_dcache_dirty, &page->flags); | 89 | clear_bit(PG_dcache_clean, &page->flags); |
90 | } | 90 | } |
91 | } | 91 | } |
92 | 92 | ||
@@ -98,7 +98,7 @@ void copy_user_highpage(struct page *to, struct page *from, | |||
98 | vto = kmap_atomic(to, KM_USER1); | 98 | vto = kmap_atomic(to, KM_USER1); |
99 | 99 | ||
100 | if (boot_cpu_data.dcache.n_aliases && page_mapped(from) && | 100 | if (boot_cpu_data.dcache.n_aliases && page_mapped(from) && |
101 | !test_bit(PG_dcache_dirty, &from->flags)) { | 101 | test_bit(PG_dcache_clean, &from->flags)) { |
102 | vfrom = kmap_coherent(from, vaddr); | 102 | vfrom = kmap_coherent(from, vaddr); |
103 | copy_page(vto, vfrom); | 103 | copy_page(vto, vfrom); |
104 | kunmap_coherent(vfrom); | 104 | kunmap_coherent(vfrom); |
@@ -141,7 +141,7 @@ void __update_cache(struct vm_area_struct *vma, | |||
141 | 141 | ||
142 | page = pfn_to_page(pfn); | 142 | page = pfn_to_page(pfn); |
143 | if (pfn_valid(pfn)) { | 143 | if (pfn_valid(pfn)) { |
144 | int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags); | 144 | int dirty = !test_and_set_bit(PG_dcache_clean, &page->flags); |
145 | if (dirty) | 145 | if (dirty) |
146 | __flush_purge_region(page_address(page), PAGE_SIZE); | 146 | __flush_purge_region(page_address(page), PAGE_SIZE); |
147 | } | 147 | } |
@@ -153,7 +153,7 @@ void __flush_anon_page(struct page *page, unsigned long vmaddr) | |||
153 | 153 | ||
154 | if (pages_do_alias(addr, vmaddr)) { | 154 | if (pages_do_alias(addr, vmaddr)) { |
155 | if (boot_cpu_data.dcache.n_aliases && page_mapped(page) && | 155 | if (boot_cpu_data.dcache.n_aliases && page_mapped(page) && |
156 | !test_bit(PG_dcache_dirty, &page->flags)) { | 156 | test_bit(PG_dcache_clean, &page->flags)) { |
157 | void *kaddr; | 157 | void *kaddr; |
158 | 158 | ||
159 | kaddr = kmap_coherent(page, vmaddr); | 159 | kaddr = kmap_coherent(page, vmaddr); |