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authorIan Munsie <imunsie@au1.ibm.com>2012-11-08 05:57:04 +0100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-11-15 05:08:07 +0100
commit798042da4e039ef551ff6e1b1ead50a763181daa (patch)
treeeff3a8e36256b98610c009c2fed9347b9ff531b3 /arch/powerpc
parentpowerpc: Add set_mode hcall (diff)
downloadlinux-798042da4e039ef551ff6e1b1ead50a763181daa.tar.xz
linux-798042da4e039ef551ff6e1b1ead50a763181daa.zip
powerpc: Add wrappers to enable/disable relocation on exceptions
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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/pseries/plpar_wrappers.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/plpar_wrappers.h b/arch/powerpc/platforms/pseries/plpar_wrappers.h
index 44ad21403452..e6cc34a67053 100644
--- a/arch/powerpc/platforms/pseries/plpar_wrappers.h
+++ b/arch/powerpc/platforms/pseries/plpar_wrappers.h
@@ -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 */