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MIPS: SGI-IP27: fix exception handler replication

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Commit 775b089aef ("MIPS: tlbex: Remove cpu_has_local_ebase") removed
generating tlb refill handlers for every CPU, which was needed for
generating per node exception handlers on IP27. Instead of resurrecting
(and fixing) refill handler generation, we simply copy all exception
vectors from the boot node to the other nodes. Also remove the config
option since the memory tradeoff for expection handler replication
is just 8k per node.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Thomas Bogendoerfer 2019-10-31 10:46:04 +01:00 committed by Paul Burton
parent d6d5df1db6
commit 6373467482
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
3 changed files with 6 additions and 26 deletions
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7
arch/mips/sgi-ip27/Kconfig
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@ -38,10 +38,3 @@ config REPLICATE_KTEXT
Say Y here to enable replicating the kernel text across multiple
nodes in a NUMA cluster. This trades memory for speed.
config REPLICATE_EXHANDLERS
bool "Exception handler replication support"
depends on SGI_IP27
help
Say Y here to enable replicating the kernel exception handlers
across multiple nodes in a NUMA cluster. This trades memory for
speed.

21
arch/mips/sgi-ip27/ip27-init.c
View File

@ -69,23 +69,14 @@ static void per_hub_init(cnodeid_t cnode)
hub_rtc_init(cnode);
#ifdef CONFIG_REPLICATE_EXHANDLERS
/*
* If this is not a headless node initialization,
* copy over the caliased exception handlers.
*/
if (get_compact_nodeid() == cnode) {
extern char except_vec2_generic, except_vec3_generic;
extern void build_tlb_refill_handler(void);
memcpy((void *)(CKSEG0 + 0x100), &except_vec2_generic, 0x80);
memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x80);
build_tlb_refill_handler();
memcpy((void *)(CKSEG0 + 0x100), (void *) CKSEG0, 0x80);
memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x100);
if (nasid) {
/* copy exception handlers from first node to current node */
memcpy((void *)NODE_OFFSET_TO_K0(nasid, 0),
(void *)CKSEG0, 0x200);
__flush_cache_all();
/* switch to node local exception handlers */
REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
}
#endif
}
void per_cpu_init(void)

4
arch/mips/sgi-ip27/ip27-memory.c
View File

@ -332,11 +332,7 @@ static void __init mlreset(void)
* thinks it is a node 0 address.
*/
REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
#ifdef CONFIG_REPLICATE_EXHANDLERS
REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
#else
REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
#endif
#ifdef LATER
/*