[RFC PATCH v0 1/5] powerpc: Define Expropriation interrupt bit to VPA byte offset 0xB9

[Bharata B Rao]

VPA byte offset 0xB9 was named as donate_dedicated_cpu as that
was the only used bit. The Expropriation/Subvention support defines
a bit in byte offset 0xB9. Define this bit and rename the field
in VPA to a generic name.

Signed-off-by: Bharata B Rao <bhar...@linux.ibm.com>
---
 arch/powerpc/include/asm/lppaca.h | 8 +++++++-
 drivers/cpuidle/cpuidle-pseries.c | 4 ++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/include/asm/lppaca.h 
b/arch/powerpc/include/asm/lppaca.h
index c390ec377bae..57e432766f3e 100644
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -80,7 +80,7 @@ struct lppaca {
        u8      ebb_regs_in_use;
        u8      reserved7[6];
        u8      dtl_enable_mask;        /* Dispatch Trace Log mask */
-       u8      donate_dedicated_cpu;   /* Donate dedicated CPU cycles */
+       u8      byte_b9; /* Donate dedicated CPU cycles & Expropriation int */
        u8      fpregs_in_use;
        u8      pmcregs_in_use;
        u8      reserved8[28];
@@ -116,6 +116,12 @@ struct lppaca {
 
 #define lppaca_of(cpu) (*paca_ptrs[cpu]->lppaca_ptr)
 
+/*
+ * Flags for Byte offset 0xB9
+ */
+#define LPPACA_DONATE_DED_CPU_CYCLES   0x1
+#define LPPACA_EXP_INT_ENABLED         0x2
+
 /*
  * We are using a non architected field to determine if a partition is
  * shared or dedicated. This currently works on both KVM and PHYP, but
diff --git a/drivers/cpuidle/cpuidle-pseries.c 
b/drivers/cpuidle/cpuidle-pseries.c
index a2b5c6f60cf0..b9d0f41c3f19 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -221,7 +221,7 @@ static int dedicated_cede_loop(struct cpuidle_device *dev,
        u8 old_latency_hint;
 
        pseries_idle_prolog();
-       get_lppaca()->donate_dedicated_cpu = 1;
+       get_lppaca()->byte_b9 |= LPPACA_DONATE_DED_CPU_CYCLES;
        old_latency_hint = get_lppaca()->cede_latency_hint;
        get_lppaca()->cede_latency_hint = cede_latency_hint[index];
 
@@ -229,7 +229,7 @@ static int dedicated_cede_loop(struct cpuidle_device *dev,
        check_and_cede_processor();
 
        local_irq_disable();
-       get_lppaca()->donate_dedicated_cpu = 0;
+       get_lppaca()->byte_b9 &= ~LPPACA_DONATE_DED_CPU_CYCLES;
        get_lppaca()->cede_latency_hint = old_latency_hint;
 
        pseries_idle_epilog();
-- 
2.31.1