stv0g/metalsvm
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

use RCCE's method to flush the write combining buffers

Browse source
This commit is contained in:
Stefan Lankes 2011-08-22 13:16:54 -07:00
parent b0b9b0996e
commit a4a4c5b9f0
3 changed files with 12 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
arch/x86/include/asm/svm.h
View file

@ -21,6 +21,10 @@
#define __ARCH_SVM_H__
#include <metalsvm/stddef.h>
#include <asm/processor.h>
#ifdef CONFIG_ROCKCREEK
#include <asm/RCCE_lib.h>
#endif
#ifdef __cplusplus
extern "C" {
@ -72,11 +76,13 @@ static inline void svm_invalidate(void)
static inline void svm_flush(void)
{
mb();
#ifndef SVM_WT
#ifdef CONFIG_ROCKCREEK
// need to write to another line to make sure the write combine buffer gets flushed
*(int *)RCCE_fool_write_combine_buffer = 1;
#endif
#ifdef SVM_WB
flush_cache();
#endif
//asm volatile ( ".byte 0x0f; .byte 0x0a;\n" ); // CL1FLUSHMB
}
#endif

2
arch/x86/mm/page.c
View file

@ -356,7 +356,7 @@ size_t map_region(size_t viraddr, size_t phyaddr, uint32_t npages, uint32_t flag
pgt->entries[index] |= PG_MPE;
#endif
if (flags & MAP_SVM)
#ifdef SVM_WT
#ifndef SVM_WB
pgt->entries[index] |= PG_SVM|PG_PWT;
#else
pgt->entries[index] |= PG_SVM;

3
arch/x86/mm/svm.c
View file

@ -228,7 +228,8 @@ int svm_emit_page(size_t phyaddr, int ue)
change_page_permissions(viraddr, viraddr+PAGE_SIZE, VMA_NOACCESS|VMA_READ|VMA_CACHEABLE);
page_owner[pageid] = ue;
mb();
// need to write to another line to make sure the write combine buffer gets flushed
*(int *)RCCE_fool_write_combine_buffer = 1;
}
return 0;