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authorShreyas B. Prabhu <shreyas@linux.vnet.ibm.com>2014-12-10 00:26:51 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2014-12-15 10:46:40 +1100
commit8eb8ac89a364305d05ad16be983b7890eb462cc3 (patch)
tree4661793e77c8b83bc5c805f3502a8fb5a037aa32 /arch/powerpc/include
parent8117ac6a6c2fa0f847ff6a21a1f32c8d2c8501d0 (diff)
downloadop-kernel-dev-8eb8ac89a364305d05ad16be983b7890eb462cc3.zip
op-kernel-dev-8eb8ac89a364305d05ad16be983b7890eb462cc3.tar.gz
powerpc/powernv: Enable Offline CPUs to enter deep idle states
The secondary threads should enter deep idle states so as to gain maximum powersavings when the entire core is offline. To do so the offline path must be made aware of the available deepest idle state. Hence probe the device tree for the possible idle states in powernv core code and expose the deepest idle state through flags. Since the device tree is probed by the cpuidle driver as well, move the parameters required to discover the idle states into an appropriate common place to both the driver and the powernv core code. Another point is that fastsleep idle state may require workarounds in the kernel to function properly. This workaround is introduced in the subsequent patches. However neither the cpuidle driver or the hotplug path need be bothered about this workaround. They will be taken care of by the core powernv code. Originally-by: Srivatsa S. Bhat <srivatsa@mit.edu> Signed-off-by: Preeti U. Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com> Reviewed-by: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: linux-pm@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/opal.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 4095749..6dedf9b 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -168,6 +168,14 @@ struct opal_sg_list {
#define OPAL_IPMI_RECV 108
#define OPAL_I2C_REQUEST 109
+/* Device tree flags */
+
+/* Flags set in power-mgmt nodes in device tree if
+ * respective idle states are supported in the platform.
+ */
+#define OPAL_PM_NAP_ENABLED 0x00010000
+#define OPAL_PM_SLEEP_ENABLED 0x00020000
+
#ifndef __ASSEMBLY__
#include <linux/notifier.h>
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