sparc64: Add a new hypercall CPU_POKE - kernel/git/torvalds/linux.git - Linux kernel source tree
- ️Fri Jul 21 2017
| author | Vijay Kumar <vijay.ac.kumar@oracle.com> | 2017-07-21 10:23:56 -0600 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-09 22:15:10 -0700 |
| commit | 28d43de741cc67a9d8748de7dcb6c5f54cfa669c (patch) | |
| tree | 5a45e75d3d4b7a392a6b68d9ae69c27dd9071159 | |
| parent | 99274b818a5dc7c3226866970a0cec0d40ed5f0f (diff) | |
| download | linux-28d43de741cc67a9d8748de7dcb6c5f54cfa669c.tar.gz |
sparc64: Add a new hypercall CPU_POKE
This adds a new hypercall CPU_POKE for quickly waking up an idle CPU. CPU_POKE should only be sent to valid non-local CPUs. Signed-off-by: Rob Gardner <rob.gardner@oracle.com> Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | arch/sparc/include/asm/hypervisor.h | 18 | ||||
| -rw-r--r-- | arch/sparc/kernel/hvcalls.S | 11 |
2 files changed, 29 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/hypervisor.h b/arch/sparc/include/asm/hypervisor.h
index 73cb8978df58c9..3dc9215d0357e0 100644
--- a/arch/sparc/include/asm/hypervisor.h
+++ b/arch/sparc/include/asm/hypervisor.h
@@ -298,6 +298,24 @@ unsigned long sun4v_cpu_stop(unsigned long cpuid);
unsigned long sun4v_cpu_yield(void);
#endif
+/* cpu_poke()
+ * TRAP: HV_FAST_TRAP
+ * FUNCTION: HV_FAST_CPU_POKE
+ * RET0: status
+ * ERRORS: ENOCPU cpuid refers to a CPU that does not exist
+ * EINVAL cpuid is current CPU
+ *
+ * Poke CPU cpuid. If the target CPU is currently suspended having
+ * invoked the cpu-yield service, that vCPU will be resumed.
+ * Poke interrupts may only be sent to valid, non-local CPUs.
+ * It is not legal to poke the current vCPU.
+ */
+#define HV_FAST_CPU_POKE 0x13
+
+#ifndef __ASSEMBLY__
+unsigned long sun4v_cpu_poke(unsigned long cpuid);
+#endif
+
/* cpu_qconf()
* TRAP: HV_FAST_TRAP
* FUNCTION: HV_FAST_CPU_QCONF
diff --git a/arch/sparc/kernel/hvcalls.S b/arch/sparc/kernel/hvcalls.S
index 4116ee5c779132..e57007ff7f8f94 100644
--- a/arch/sparc/kernel/hvcalls.S
+++ b/arch/sparc/kernel/hvcalls.S
@@ -106,6 +106,17 @@ ENTRY(sun4v_cpu_yield)
nop
ENDPROC(sun4v_cpu_yield)
+ /* %o0: cpuid
+ *
+ * returns %o0: status
+ */
+ENTRY(sun4v_cpu_poke)
+ mov HV_FAST_CPU_POKE, %o5
+ ta HV_FAST_TRAP
+ retl
+ nop
+ENDPROC(sun4v_cpu_poke)
+
/* %o0: type
* %o1: queue paddr
* %o2: num queue entries