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[IA64] Multiple outstanding ptc.g instruction support

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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 <[email protected]>
Signed-off-by: Tony Luck <[email protected]>
This commit is contained in:
Fenghua Yu 2008-04-04 11:05:59 -07:00 • committed by Tony Luck
commit 2046b94e7c
5 changed files with 178 additions and 17 deletions
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17
include/asm-ia64/sal.h
View file

@ -296,6 +296,9 @@ enum {
EFI_GUID(0xe429faf8, 0x3cb7, 0x11d4, 0xbc, 0xa7, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81)
#define SAL_PLAT_BUS_ERR_SECT_GUID \
EFI_GUID(0xe429faf9, 0x3cb7, 0x11d4, 0xbc, 0xa7, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81)
#define PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID \
EFI_GUID(0x6cb0a200, 0x893a, 0x11da, 0x96, 0xd2, 0x0, 0x10, 0x83, 0xff, \
0xca, 0x4d)
#define MAX_CACHE_ERRORS 6
#define MAX_TLB_ERRORS 6
@ -879,6 +882,20 @@ extern void ia64_jump_to_sal(struct sal_to_os_boot *);
extern void ia64_sal_handler_init(void *entry_point, void *gpval);
#define PALO_MAX_TLB_PURGES 0xFFFF
#define PALO_SIG "PALO"
struct palo_table {
u8 signature[4]; /* Should be "PALO" */
u32 length;
u8 minor_revision;
u8 major_revision;
u8 checksum;
u8 reserved1[5];
u16 max_tlb_purges;
u8 reserved2[6];
};
#endif /* __ASSEMBLY__ */
#endif /* _ASM_IA64_SAL_H */

1
include/asm-ia64/tlbflush.h
View file

@ -17,6 +17,7 @@
* Now for some TLB flushing routines. This is the kind of stuff that
* can be very expensive, so try to avoid them whenever possible.
*/
extern void setup_ptcg_sem(int max_purges, int from_palo);
/*
* Flush everything (kernel mapping may also have changed due to