x86: cpa: move flush to cpa
The set_memory_* and set_pages_* family of API's currently requires the
callers to do a global tlb flush after the function call; forgetting this is
a very nasty deathtrap. This patch moves the global tlb flush into
each of the callers
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 8860c6e..4d5cc71 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -572,7 +572,6 @@
panic("Cannot allocate GATT table");
if (set_memory_uc((unsigned long)gatt, gatt_size >> PAGE_SHIFT))
panic("Could not set GART PTEs to uncacheable pages");
- global_flush_tlb();
memset(gatt, 0, gatt_size);
agp_gatt_table = gatt;
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index f7b941c..0d3369b 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -752,15 +752,11 @@
printk("Write protecting the kernel text: %luk\n", size >> 10);
#ifdef CONFIG_CPA_DEBUG
- global_flush_tlb();
-
printk("Testing CPA: Reverting %lx-%lx\n", start, start+size);
set_pages_rw(virt_to_page(start), size>>PAGE_SHIFT);
- global_flush_tlb();
printk("Testing CPA: write protecting again\n");
set_pages_ro(virt_to_page(start), size>>PAGE_SHIFT);
- global_flush_tlb();
#endif
}
#endif
@@ -770,22 +766,12 @@
printk("Write protecting the kernel read-only data: %luk\n",
size >> 10);
- /*
- * set_pages_*() requires a global_flush_tlb() call after it.
- * We do this after the printk so that if something went wrong in the
- * change, the printk gets out at least to give a better debug hint
- * of who is the culprit.
- */
- global_flush_tlb();
-
#ifdef CONFIG_CPA_DEBUG
printk("Testing CPA: undo %lx-%lx\n", start, start + size);
set_pages_rw(virt_to_page(start), size >> PAGE_SHIFT);
- global_flush_tlb();
printk("Testing CPA: write protecting again\n");
set_pages_ro(virt_to_page(start), size >> PAGE_SHIFT);
- global_flush_tlb();
#endif
}
#endif
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 4757be7..9b69fa5 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -610,22 +610,12 @@
printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(end - start) >> 10);
- /*
- * set_memory_*() requires a global_flush_tlb() call after it.
- * We do this after the printk so that if something went wrong in the
- * change, the printk gets out at least to give a better debug hint
- * of who is the culprit.
- */
- global_flush_tlb();
-
#ifdef CONFIG_CPA_DEBUG
printk("Testing CPA: undo %lx-%lx\n", start, end);
set_memory_rw(start, (end-start) >> PAGE_SHIFT);
- global_flush_tlb();
printk("Testing CPA: again\n");
set_memory_ro(start, (end-start) >> PAGE_SHIFT);
- global_flush_tlb();
#endif
}
#endif
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index b86f66f..6a9a141 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -96,8 +96,6 @@
err = set_memory_wb(vaddr, nrpages);
break;
}
- if (!err)
- global_flush_tlb();
return err;
}
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index e4d2b69..a2d747c 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -23,6 +23,36 @@
}
/*
+ * Flushing functions
+ */
+void clflush_cache_range(void *addr, int size)
+{
+ int i;
+
+ for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
+ clflush(addr+i);
+}
+
+static void flush_kernel_map(void *arg)
+{
+ /*
+ * Flush all to work around Errata in early athlons regarding
+ * large page flushing.
+ */
+ __flush_tlb_all();
+
+ if (boot_cpu_data.x86_model >= 4)
+ wbinvd();
+}
+
+static void global_flush_tlb(void)
+{
+ BUG_ON(irqs_disabled());
+
+ on_each_cpu(flush_kernel_map, NULL, 1, 1);
+}
+
+/*
* Certain areas of memory on x86 require very specific protection flags,
* for example the BIOS area or kernel text. Callers don't always get this
* right (again, ioremap() on BIOS memory is not uncommon) so this function
@@ -328,149 +358,124 @@
int set_memory_uc(unsigned long addr, int numpages)
{
- pgprot_t uncached;
+ int err;
- pgprot_val(uncached) = _PAGE_PCD | _PAGE_PWT;
- return change_page_attr_set(addr, numpages, uncached);
+ err = change_page_attr_set(addr, numpages,
+ __pgprot(_PAGE_PCD | _PAGE_PWT));
+ global_flush_tlb();
+ return err;
}
EXPORT_SYMBOL(set_memory_uc);
int set_memory_wb(unsigned long addr, int numpages)
{
- pgprot_t uncached;
+ int err;
- pgprot_val(uncached) = _PAGE_PCD | _PAGE_PWT;
- return change_page_attr_clear(addr, numpages, uncached);
+ err = change_page_attr_clear(addr, numpages,
+ __pgprot(_PAGE_PCD | _PAGE_PWT));
+ global_flush_tlb();
+ return err;
}
EXPORT_SYMBOL(set_memory_wb);
int set_memory_x(unsigned long addr, int numpages)
{
- pgprot_t nx;
+ int err;
- pgprot_val(nx) = _PAGE_NX;
- return change_page_attr_clear(addr, numpages, nx);
+ err = change_page_attr_clear(addr, numpages,
+ __pgprot(_PAGE_NX));
+ global_flush_tlb();
+ return err;
}
EXPORT_SYMBOL(set_memory_x);
int set_memory_nx(unsigned long addr, int numpages)
{
- pgprot_t nx;
+ int err;
- pgprot_val(nx) = _PAGE_NX;
- return change_page_attr_set(addr, numpages, nx);
+ err = change_page_attr_set(addr, numpages,
+ __pgprot(_PAGE_NX));
+ global_flush_tlb();
+ return err;
}
EXPORT_SYMBOL(set_memory_nx);
int set_memory_ro(unsigned long addr, int numpages)
{
- pgprot_t rw;
+ int err;
- pgprot_val(rw) = _PAGE_RW;
- return change_page_attr_clear(addr, numpages, rw);
+ err = change_page_attr_clear(addr, numpages,
+ __pgprot(_PAGE_RW));
+ global_flush_tlb();
+ return err;
}
int set_memory_rw(unsigned long addr, int numpages)
{
- pgprot_t rw;
+ int err;
- pgprot_val(rw) = _PAGE_RW;
- return change_page_attr_set(addr, numpages, rw);
+ err = change_page_attr_set(addr, numpages,
+ __pgprot(_PAGE_RW));
+ global_flush_tlb();
+ return err;
}
int set_memory_np(unsigned long addr, int numpages)
{
- pgprot_t present;
+ int err;
- pgprot_val(present) = _PAGE_PRESENT;
- return change_page_attr_clear(addr, numpages, present);
+ err = change_page_attr_clear(addr, numpages,
+ __pgprot(_PAGE_PRESENT));
+ global_flush_tlb();
+ return err;
}
int set_pages_uc(struct page *page, int numpages)
{
unsigned long addr = (unsigned long)page_address(page);
- pgprot_t uncached;
- pgprot_val(uncached) = _PAGE_PCD | _PAGE_PWT;
- return change_page_attr_set(addr, numpages, uncached);
+ return set_memory_uc(addr, numpages);
}
EXPORT_SYMBOL(set_pages_uc);
int set_pages_wb(struct page *page, int numpages)
{
unsigned long addr = (unsigned long)page_address(page);
- pgprot_t uncached;
- pgprot_val(uncached) = _PAGE_PCD | _PAGE_PWT;
- return change_page_attr_clear(addr, numpages, uncached);
+ return set_memory_wb(addr, numpages);
}
EXPORT_SYMBOL(set_pages_wb);
int set_pages_x(struct page *page, int numpages)
{
unsigned long addr = (unsigned long)page_address(page);
- pgprot_t nx;
- pgprot_val(nx) = _PAGE_NX;
- return change_page_attr_clear(addr, numpages, nx);
+ return set_memory_x(addr, numpages);
}
EXPORT_SYMBOL(set_pages_x);
int set_pages_nx(struct page *page, int numpages)
{
unsigned long addr = (unsigned long)page_address(page);
- pgprot_t nx;
- pgprot_val(nx) = _PAGE_NX;
- return change_page_attr_set(addr, numpages, nx);
+ return set_memory_nx(addr, numpages);
}
EXPORT_SYMBOL(set_pages_nx);
int set_pages_ro(struct page *page, int numpages)
{
unsigned long addr = (unsigned long)page_address(page);
- pgprot_t rw;
- pgprot_val(rw) = _PAGE_RW;
- return change_page_attr_clear(addr, numpages, rw);
+ return set_memory_ro(addr, numpages);
}
int set_pages_rw(struct page *page, int numpages)
{
unsigned long addr = (unsigned long)page_address(page);
- pgprot_t rw;
- pgprot_val(rw) = _PAGE_RW;
- return change_page_attr_set(addr, numpages, rw);
+ return set_memory_rw(addr, numpages);
}
-void clflush_cache_range(void *addr, int size)
-{
- int i;
-
- for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
- clflush(addr+i);
-}
-
-static void flush_kernel_map(void *arg)
-{
- /*
- * Flush all to work around Errata in early athlons regarding
- * large page flushing.
- */
- __flush_tlb_all();
-
- if (boot_cpu_data.x86_model >= 4)
- wbinvd();
-}
-
-void global_flush_tlb(void)
-{
- BUG_ON(irqs_disabled());
-
- on_each_cpu(flush_kernel_map, NULL, 1, 1);
-}
-EXPORT_SYMBOL(global_flush_tlb);
#ifdef CONFIG_DEBUG_PAGEALLOC
diff --git a/drivers/char/agp/ali-agp.c b/drivers/char/agp/ali-agp.c
index aa5ddb7..1ffb381 100644
--- a/drivers/char/agp/ali-agp.c
+++ b/drivers/char/agp/ali-agp.c
@@ -145,7 +145,6 @@
void *addr = agp_generic_alloc_page(agp_bridge);
u32 temp;
- global_flush_tlb();
if (!addr)
return NULL;
@@ -162,7 +161,6 @@
if (flags & AGP_PAGE_DESTROY_UNMAP) {
global_cache_flush(); /* is this really needed? --hch */
agp_generic_destroy_page(addr, flags);
- global_flush_tlb();
} else
agp_generic_destroy_page(addr, flags);
}
diff --git a/drivers/char/agp/i460-agp.c b/drivers/char/agp/i460-agp.c
index e72a83e..76f581c 100644
--- a/drivers/char/agp/i460-agp.c
+++ b/drivers/char/agp/i460-agp.c
@@ -527,7 +527,6 @@
if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
page = agp_generic_alloc_page(agp_bridge);
- global_flush_tlb();
} else
/* Returning NULL would cause problems */
/* AK: really dubious code. */
@@ -539,7 +538,6 @@
{
if (I460_IO_PAGE_SHIFT <= PAGE_SHIFT) {
agp_generic_destroy_page(page, flags);
- global_flush_tlb();
}
}
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index c03a714..189efb6 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -212,11 +212,9 @@
if (set_pages_uc(page, 4) < 0) {
set_pages_wb(page, 4);
- global_flush_tlb();
__free_pages(page, 2);
return NULL;
}
- global_flush_tlb();
get_page(page);
atomic_inc(&agp_bridge->current_memory_agp);
return page_address(page);
@@ -231,7 +229,6 @@
page = virt_to_page(addr);
set_pages_wb(page, 4);
- global_flush_tlb();
put_page(page);
__free_pages(page, 2);
atomic_dec(&agp_bridge->current_memory_agp);
@@ -341,7 +338,6 @@
switch (pg_count) {
case 1: addr = agp_bridge->driver->agp_alloc_page(agp_bridge);
- global_flush_tlb();
break;
case 4:
/* kludge to get 4 physical pages for ARGB cursor */
@@ -404,7 +400,6 @@
else {
agp_bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[0]),
AGP_PAGE_DESTROY_UNMAP);
- global_flush_tlb();
agp_bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[0]),
AGP_PAGE_DESTROY_FREE);
}
diff --git a/drivers/video/vermilion/vermilion.c b/drivers/video/vermilion/vermilion.c
index fb72778..1c65666 100644
--- a/drivers/video/vermilion/vermilion.c
+++ b/drivers/video/vermilion/vermilion.c
@@ -124,13 +124,8 @@
/*
* Change caching policy of the linear kernel map to avoid
* mapping type conflicts with user-space mappings.
- * The first global_flush_tlb() is really only there to do a global
- * wbinvd().
*/
-
- global_flush_tlb();
set_pages_uc(virt_to_page(va->logical), va->size >> PAGE_SHIFT);
- global_flush_tlb();
printk(KERN_DEBUG MODULE_NAME
": Allocated %ld bytes vram area at 0x%08lx\n",
@@ -156,7 +151,6 @@
set_pages_wb(virt_to_page(va->logical),
va->size >> PAGE_SHIFT);
- global_flush_tlb();
/*
* Decrease the usage count on the pages we've used
diff --git a/include/asm-x86/agp.h b/include/asm-x86/agp.h
index f6df725..0c309b9 100644
--- a/include/asm-x86/agp.h
+++ b/include/asm-x86/agp.h
@@ -12,13 +12,9 @@
* page. This avoids data corruption on some CPUs.
*/
-/*
- * Caller's responsibility to call global_flush_tlb() for performance
- * reasons
- */
#define map_page_into_agp(page) set_pages_uc(page, 1)
#define unmap_page_from_agp(page) set_pages_wb(page, 1)
-#define flush_agp_mappings() global_flush_tlb()
+#define flush_agp_mappings() do { } while (0)
/*
* Could use CLFLUSH here if the cpu supports it. But then it would
diff --git a/include/asm-x86/cacheflush.h b/include/asm-x86/cacheflush.h
index d15ff35..157da02 100644
--- a/include/asm-x86/cacheflush.h
+++ b/include/asm-x86/cacheflush.h
@@ -24,7 +24,6 @@
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
memcpy(dst, src, len)
-void global_flush_tlb(void);
int __deprecated_for_modules change_page_attr(struct page *page, int numpages,
pgprot_t prot);
diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index e565090..4bb9764 100644
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -715,7 +715,6 @@
set_pages_uc(virt_to_page(buf), size);
else
set_pages_wb(virt_to_page(buf), size);
- global_flush_tlb();
}
#else
#define fill_nocache(buf, size, nocache) do { ; } while (0)