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authorGautham R Shenoy <ego@in.ibm.com>2009-10-29 19:22:48 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-11-24 03:33:03 (GMT)
commit69ddb57cbea0b3dd851ea5f1edd1e609ad4da04e (patch)
treeb6947912b2e4528d5874809af6dae7aa8405ba56
parentd95cacc599a79d87052b3975f60cae62c04dc01f (diff)
downloadlinux-69ddb57cbea0b3dd851ea5f1edd1e609ad4da04e.tar.xz
powerpc/pseries: Add extended_cede_processor() helper function.
This patch provides an extended_cede_processor() helper function which takes the cede latency hint as an argument. This hint is to be passed on to the hypervisor to cede to the corresponding state on platforms which support it. Signed-off-by: Gautham R Shenoy <ego@in.ibm.com> Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/include/asm/lppaca.h9
-rw-r--r--arch/powerpc/platforms/pseries/plpar_wrappers.h22
-rw-r--r--arch/powerpc/xmon/xmon.c3
3 files changed, 32 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h
index f78f65c..14b592d 100644
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -100,7 +100,14 @@ struct lppaca {
// Used to pass parms from the OS to PLIC for SetAsrAndRfid
u64 saved_gpr3; // Saved GPR3 x20-x27
u64 saved_gpr4; // Saved GPR4 x28-x2F
- u64 saved_gpr5; // Saved GPR5 x30-x37
+ union {
+ u64 saved_gpr5; /* Saved GPR5 x30-x37 */
+ struct {
+ u8 cede_latency_hint; /* x30 */
+ u8 reserved[7]; /* x31-x36 */
+ } fields;
+ } gpr5_dword;
+
u8 dtl_enable_mask; // Dispatch Trace Log mask x38-x38
u8 donate_dedicated_cpu; // Donate dedicated CPU cycles x39-x39
diff --git a/arch/powerpc/platforms/pseries/plpar_wrappers.h b/arch/powerpc/platforms/pseries/plpar_wrappers.h
index a24a6b23..0603c91 100644
--- a/arch/powerpc/platforms/pseries/plpar_wrappers.h
+++ b/arch/powerpc/platforms/pseries/plpar_wrappers.h
@@ -9,11 +9,33 @@ static inline long poll_pending(void)
return plpar_hcall_norets(H_POLL_PENDING);
}
+static inline u8 get_cede_latency_hint(void)
+{
+ return get_lppaca()->gpr5_dword.fields.cede_latency_hint;
+}
+
+static inline void set_cede_latency_hint(u8 latency_hint)
+{
+ get_lppaca()->gpr5_dword.fields.cede_latency_hint = latency_hint;
+}
+
static inline long cede_processor(void)
{
return plpar_hcall_norets(H_CEDE);
}
+static inline long extended_cede_processor(unsigned long latency_hint)
+{
+ long rc;
+ u8 old_latency_hint = get_cede_latency_hint();
+
+ set_cede_latency_hint(latency_hint);
+ rc = cede_processor();
+ set_cede_latency_hint(old_latency_hint);
+
+ return rc;
+}
+
static inline long vpa_call(unsigned long flags, unsigned long cpu,
unsigned long vpa)
{
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index bdbe96c..4e6152c 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -1641,7 +1641,8 @@ static void super_regs(void)
ptrLpPaca->saved_srr0, ptrLpPaca->saved_srr1);
printf(" Saved Gpr3=%.16lx Saved Gpr4=%.16lx \n",
ptrLpPaca->saved_gpr3, ptrLpPaca->saved_gpr4);
- printf(" Saved Gpr5=%.16lx \n", ptrLpPaca->saved_gpr5);
+ printf(" Saved Gpr5=%.16lx \n",
+ ptrLpPaca->gpr5_dword.saved_gpr5);
}
#endif