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powerpc/pseries: Add kernel parameter to disable batched hcalls

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This introduces a pair of kernel parameters that can be used to disable
the MULTITCE and BULK_REMOVE h-calls.

By default, those hcalls are enabled, active, and good for throughput
and performance.  The ability to disable them will be useful for some of
the PREEMPT_RT related investigation and work occurring on Power.

Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
cc: Olof Johansson <olof@lixom.net>
cc: Anton Blanchard <anton@samba.org>
cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Will Schmidt
2010-09-28 15:33:12 +00:00
committed by Benjamin Herrenschmidt
parent 475fc7c011
commit 4e89a2d8e2
3 changed files with 34 additions and 0 deletions
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12
arch/powerpc/platforms/pseries/lpar.c
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@@ -627,6 +627,18 @@ static void pSeries_lpar_flush_hash_range(unsigned long number, int local)
spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
}
static int __init disable_bulk_remove(char *str)
{
if (strcmp(str, "off") == 0 &&
firmware_has_feature(FW_FEATURE_BULK_REMOVE)) {
printk(KERN_INFO "Disabling BULK_REMOVE firmware feature");
powerpc_firmware_features &= ~FW_FEATURE_BULK_REMOVE;
}
return 1;
}
__setup("bulk_remove=", disable_bulk_remove);
void __init hpte_init_lpar(void)
{
ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate;