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Subject[PPC64] Bolted SLB entry for iSeries
Andrew, please apply.

Tested, at least basically, on Power4 iSeries with shared processors,
on Power4 pSeries and RS64 (non-SLB) iSeries machines.

On pSeries SLB machines we "bolt" an SLB entry for the first segment
of the vmalloc() area into the SLB, to reduce the SLB miss rate. This
caused problems, so was disabled, on iSeries because the bolted entry
was not restored properly on shared processor switch. This patch adds
information about the bolted vmalloc segment to the lpar map, which
should be restored on shared processor switch.

Index: working-2.6/arch/ppc64/mm/slb.c
===================================================================
--- working-2.6.orig/arch/ppc64/mm/slb.c 2004-08-09 09:51:38.000000000 +1000
+++ working-2.6/arch/ppc64/mm/slb.c 2004-08-19 11:15:01.303548888 +1000
@@ -36,7 +36,6 @@

static void slb_add_bolted(void)
{
-#ifndef CONFIG_PPC_ISERIES
WARN_ON(!irqs_disabled());

/* If you change this make sure you change SLB_NUM_BOLTED
@@ -49,7 +48,6 @@
SLB_VSID_KERNEL, 1);

asm volatile("isync":::"memory");
-#endif
}

/* Flush all user entries from the segment table of the current processor. */
Index: working-2.6/arch/ppc64/kernel/head.S
===================================================================
--- working-2.6.orig/arch/ppc64/kernel/head.S 2004-08-09 09:51:38.000000000 +1000
+++ working-2.6/arch/ppc64/kernel/head.S 2004-08-19 11:15:01.310547824 +1000
@@ -580,7 +580,7 @@
* VSID generation algorithm. See include/asm/mmu_context.h.
*/

- .llong 1 /* # ESIDs to be mapped by hypervisor */
+ .llong 2 /* # ESIDs to be mapped by hypervisor */
.llong 1 /* # memory ranges to be mapped by hypervisor */
.llong STAB0_PAGE /* Page # of segment table within load area */
.llong 0 /* Reserved */
@@ -588,8 +588,12 @@
.llong 0 /* Reserved */
.llong 0 /* Reserved */
.llong 0 /* Reserved */
- .llong 0x0c00000000 /* ESID to map (Kernel at EA = 0xC000000000000000) */
- .llong 0x06a99b4b14 /* VSID to map (Kernel at VA = 0x6a99b4b140000000) */
+ .llong 0xc00000000 /* KERNELBASE ESID */
+ .llong 0x6a99b4b14 /* KERNELBASE VSID */
+ /* We have to list the bolted VMALLOC segment here, too, so that it
+ * will be restored on shared processor switch */
+ .llong 0xd00000000 /* VMALLOCBASE ESID */
+ .llong 0x08d12e6ab /* VMALLOCBASE VSID */
.llong 8192 /* # pages to map (32 MB) */
.llong 0 /* Offset from start of loadarea to start of map */
.llong 0x0006a99b4b140000 /* VPN of first page to map */

--
David Gibson | For every complex problem there is a
david AT gibson.dropbear.id.au | solution which is simple, neat and
| wrong.
http://www.ozlabs.org/people/dgibson
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