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authorFenghua Yu <fenghua.yu@intel.com>2008-04-04 14:05:59 -0400
committerTony Luck <tony.luck@intel.com>2008-04-04 14:05:59 -0400
commit2046b94e7c4fce92eb8165c2c36c6478f4927178 (patch)
tree0dbbdf17d64b521f2debcc8677368ceec8805d8c /arch/ia64/kernel/efi.c
parente315c121a858499d84dc88c499046b9f10bb61ec (diff)
[IA64] Multiple outstanding ptc.g instruction support
According to SDM2.2, Itanium supports multiple outstanding ptc.g instructions. But current kernel function ia64_global_tlb_purge() uses a spinlock to serialize ptc.g instructions issued by multiple processors. This serialization might have scalability issue on a big SMP machine where many processors could purge TLB in parallel. The patch fixes this problem by issuing multiple ptc.g instructions in ia64_global_tlb_purge(). It also adds support for the "PALO" table to get a platform view of the max number of outstanding ptc.g instructions (which may be different from the processor view found from PAL_VM_SUMMARY). PALO specification can be found at: http://www.dig64.org/home/DIG64_PALO_R1_0.pdf spinaphore implementation by Matthew Wilcox. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/efi.c')
-rw-r--r--arch/ia64/kernel/efi.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index 728d7247a1a..003cd09b073 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -37,6 +37,7 @@
37#include <asm/pgtable.h> 37#include <asm/pgtable.h>
38#include <asm/processor.h> 38#include <asm/processor.h>
39#include <asm/mca.h> 39#include <asm/mca.h>
40#include <asm/tlbflush.h>
40 41
41#define EFI_DEBUG 0 42#define EFI_DEBUG 0
42 43
@@ -403,6 +404,41 @@ efi_get_pal_addr (void)
403 return NULL; 404 return NULL;
404} 405}
405 406
407
408static u8 __init palo_checksum(u8 *buffer, u32 length)
409{
410 u8 sum = 0;
411 u8 *end = buffer + length;
412
413 while (buffer < end)
414 sum = (u8) (sum + *(buffer++));
415
416 return sum;
417}
418
419/*
420 * Parse and handle PALO table which is published at:
421 * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
422 */
423static void __init handle_palo(unsigned long palo_phys)
424{
425 struct palo_table *palo = __va(palo_phys);
426 u8 checksum;
427
428 if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
429 printk(KERN_INFO "PALO signature incorrect.\n");
430 return;
431 }
432
433 checksum = palo_checksum((u8 *)palo, palo->length);
434 if (checksum) {
435 printk(KERN_INFO "PALO checksum incorrect.\n");
436 return;
437 }
438
439 setup_ptcg_sem(palo->max_tlb_purges, 1);
440}
441
406void 442void
407efi_map_pal_code (void) 443efi_map_pal_code (void)
408{ 444{
@@ -432,6 +468,7 @@ efi_init (void)
432 u64 efi_desc_size; 468 u64 efi_desc_size;
433 char *cp, vendor[100] = "unknown"; 469 char *cp, vendor[100] = "unknown";
434 int i; 470 int i;
471 unsigned long palo_phys;
435 472
436 /* 473 /*
437 * It's too early to be able to use the standard kernel command line 474 * It's too early to be able to use the standard kernel command line
@@ -496,6 +533,8 @@ efi_init (void)
496 efi.hcdp = EFI_INVALID_TABLE_ADDR; 533 efi.hcdp = EFI_INVALID_TABLE_ADDR;
497 efi.uga = EFI_INVALID_TABLE_ADDR; 534 efi.uga = EFI_INVALID_TABLE_ADDR;
498 535
536 palo_phys = EFI_INVALID_TABLE_ADDR;
537
499 for (i = 0; i < (int) efi.systab->nr_tables; i++) { 538 for (i = 0; i < (int) efi.systab->nr_tables; i++) {
500 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) { 539 if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
501 efi.mps = config_tables[i].table; 540 efi.mps = config_tables[i].table;
@@ -515,10 +554,17 @@ efi_init (void)
515 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) { 554 } else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
516 efi.hcdp = config_tables[i].table; 555 efi.hcdp = config_tables[i].table;
517 printk(" HCDP=0x%lx", config_tables[i].table); 556 printk(" HCDP=0x%lx", config_tables[i].table);
557 } else if (efi_guidcmp(config_tables[i].guid,
558 PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID) == 0) {
559 palo_phys = config_tables[i].table;
560 printk(" PALO=0x%lx", config_tables[i].table);
518 } 561 }
519 } 562 }
520 printk("\n"); 563 printk("\n");
521 564
565 if (palo_phys != EFI_INVALID_TABLE_ADDR)
566 handle_palo(palo_phys);
567
522 runtime = __va(efi.systab->runtime); 568 runtime = __va(efi.systab->runtime);
523 efi.get_time = phys_get_time; 569 efi.get_time = phys_get_time;
524 efi.set_time = phys_set_time; 570 efi.set_time = phys_set_time;