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powerpc: Add wrappers to enable/disable relocation on exceptions

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These wrappers hide the parameters that have to be passed to H_SET_MODE
to enable/disable relocation on during exceptions.

As noted in the comments, since these have partition wide scope, they
may take some time to complete and must be periodically retried until
H_SUCCESS is returned.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Ian Munsie
2012-11-08 15:57:04 +11:00
committed by Benjamin Herrenschmidt
parent d8f48ecc0e
commit 798042da4e
1 changed files with 25 additions and 0 deletions
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25
arch/powerpc/platforms/pseries/plpar_wrappers.h
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@@ -279,4 +279,29 @@ static inline long plpar_set_mode(unsigned long mflags, unsigned long resource,
{
return plpar_hcall_norets(H_SET_MODE, mflags, resource, value1, value2);
}
/*
* Enable relocation on exceptions on this partition
*
* Note: this call has a partition wide scope and can take a while to complete.
* If it returns H_LONG_BUSY_* it should be retried periodically until it
* returns H_SUCCESS.
*/
static inline long enable_reloc_on_exceptions(void)
{
/* mflags = 3: Exceptions at 0xC000000000004000 */
return plpar_set_mode(3, 3, 0, 0);
}
/*
* Disable relocation on exceptions on this partition
*
* Note: this call has a partition wide scope and can take a while to complete.
* If it returns H_LONG_BUSY_* it should be retried periodically until it
* returns H_SUCCESS.
*/
static inline long disable_reloc_on_exceptions(void) {
return plpar_set_mode(0, 3, 0, 0);
}
#endif /* _PSERIES_PLPAR_WRAPPERS_H */