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Introduction of write-combined memory type mappings.

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Introduction of VR_WRITE_COMBINED, PTATTR_WRITE_COMBINED and modification
to the memobj's get_page() interface so that Linux communicates back mapping
flags (such as write-combined).
This commit is contained in:
Balazs Gerofi
2015-03-05 15:43:43 +09:00
parent ea5681232e
commit bf12a5c45e
10 changed files with 46 additions and 12 deletions
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12
kernel/devobj.c
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@@ -32,6 +32,8 @@
#include <pager.h>
#include <string.h>
#include <syscall.h>
#include <process.h>
#define dkprintf(...) do { if (0) kprintf(__VA_ARGS__); } while (0)
#define ekprintf(...) kprintf(__VA_ARGS__)
@@ -192,7 +194,7 @@ static void devobj_release(struct memobj *memobj)
return;
}
static int devobj_get_page(struct memobj *memobj, off_t off, int p2align, uintptr_t *physp)
static int devobj_get_page(struct memobj *memobj, off_t off, int p2align, uintptr_t *physp, unsigned long *flag)
{
const off_t pgoff = off >> PAGE_SHIFT;
struct devobj *obj = to_devobj(memobj);
@@ -232,6 +234,14 @@ kprintf("ix: %ld\n", ix);
/* convert remote physical into local physical */
kprintf("devobj_get_page(%p %lx,%lx,%d):PFN_PRESENT before %#lx\n", memobj, obj->handle, off, p2align, pfn);
attr = pfn & ~PFN_PFN;
/* TODO: do an arch dependent PTE to mapping flag conversion
* instead of this inline check, also, we rely on having the
* same PAT config as Linux here.. */
if ((pfn & PFL1_PWT) && !(pfn & PFL1_PCD)) {
*flag |= VR_WRITE_COMBINED;
}
pfn = ihk_mc_map_memory(NULL, (pfn & PFN_PFN), PAGE_SIZE);
pfn &= PFN_PFN;
pfn |= attr;