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powerpc/pseries: Use H_CLEAR_HPT to clear MMU hash table during kexec 

An hcall was recently added that does exactly what we need during kexec
- it clears the entire MMU hash table, ignoring any VRMA mappings.

Try it and fall back to the old method if we get a failure.

On a POWER8 box with 5TB of memory, this reduces the time it takes to
kexec a new kernel from from 4 minutes to 1 minute.

Signed-off-by: Anton Blanchard <anton@samba.org>
Tested-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
[mpe: Split into separate functions and tweak function naming]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2016-10-01 20:41:56 +10:00 committed by Michael Ellerman
parent 9e607f7274
commit 5246adec59
2 changed files with 24 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/include/asm/hvcall.h
View File

@ -275,7 +275,8 @@
#define H_COP 0x304
#define H_GET_MPP_X 0x314
#define H_SET_MODE 0x31C
#define MAX_HCALL_OPCODE H_SET_MODE
#define H_CLEAR_HPT 0x358
#define MAX_HCALL_OPCODE H_CLEAR_HPT
/* H_VIOCTL functions */
#define H_GET_VIOA_DUMP_SIZE 0x01

24
arch/powerpc/platforms/pseries/lpar.c
View File

@ -221,7 +221,7 @@ static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
return -1;
}
static void pSeries_lpar_hptab_clear(void)
static void manual_hpte_clear_all(void)
{
unsigned long size_bytes = 1UL << ppc64_pft_size;
unsigned long hpte_count = size_bytes >> 4;
@ -249,6 +249,26 @@ static void pSeries_lpar_hptab_clear(void)
&(ptes[j].pteh), &(ptes[j].ptel));
}
}
}
static int hcall_hpte_clear_all(void)
{
int rc;
do {
rc = plpar_hcall_norets(H_CLEAR_HPT);
} while (rc == H_CONTINUE);
return rc;
}
static void pseries_hpte_clear_all(void)
{
int rc;
rc = hcall_hpte_clear_all();
if (rc != H_SUCCESS)
manual_hpte_clear_all();
#ifdef __LITTLE_ENDIAN__
/*
@ -598,7 +618,7 @@ void __init hpte_init_pseries(void)
mmu_hash_ops.hpte_remove = pSeries_lpar_hpte_remove;
mmu_hash_ops.hpte_removebolted = pSeries_lpar_hpte_removebolted;
mmu_hash_ops.flush_hash_range = pSeries_lpar_flush_hash_range;
mmu_hash_ops.hpte_clear_all = pSeries_lpar_hptab_clear;
mmu_hash_ops.hpte_clear_all = pseries_hpte_clear_all;
mmu_hash_ops.hugepage_invalidate = pSeries_lpar_hugepage_invalidate;
}