d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Don't assume pmap_mapdev() gets called only for memory mapped I/O

Browse Source 
addresses (i.e. uncacheable). ACPI in particular uses pmap_mapdev()
rather excessively (number of calls) just to get a valid KVA. To
that end, have pmap_mapdev():
1.  cache the last result so that we don't waste time for multiple
    consecutive invocations with the same PA/SZ.
2.  find the memory descriptor that covers the PA and return NULL
    if none was found or when the PA is for a common DRAM address.
3.  Use either a region 6 or region 7 KVA, in accordance with the
    memory attribute.
This commit is contained in:
Marcel Moolenaar 2011-07-16 20:34:02 +00:00
parent ae78a2ad86
commit 08f72ab5dc
1 changed files with 29 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
sys/ia64/ia64/pmap.c
View File

@ -66,6 +66,7 @@ __FBSDID("$FreeBSD$");
#include <vm/uma.h>
#include <machine/bootinfo.h>
#include <machine/efi.h>
#include <machine/md_var.h>
#include <machine/pal.h>
@ -2235,12 +2236,37 @@ pmap_remove_write(vm_page_t m)
* NOT real memory.
*/
void *
pmap_mapdev(vm_paddr_t pa, vm_size_t size)
pmap_mapdev(vm_paddr_t pa, vm_size_t sz)
{
static void *last_va = NULL;
static vm_paddr_t last_pa = 0;
static vm_size_t last_sz = 0;
struct efi_md *md;
vm_offset_t va;
va = pa | IA64_RR_BASE(6);
return ((void *)va);
if (pa == last_pa && sz == last_sz)
return (last_va);
md = efi_md_find(pa);
if (md == NULL) {
printf("%s: [%#lx..%#lx] not covered by memory descriptor\n",
__func__, pa, pa + sz - 1);
return (NULL);
}
if (md->md_type == EFI_MD_TYPE_FREE) {
printf("%s: [%#lx..%#lx] is in DRAM\n", __func__, pa,
pa + sz - 1);
return (NULL);
}
va = (md->md_attr & EFI_MD_ATTR_WB) ? IA64_PHYS_TO_RR7(pa) :
IA64_PHYS_TO_RR6(pa);
last_va = (void *)va;
last_pa = pa;
last_sz = sz;
return (last_va);
}
/*