[PATCH] powerpc: export data from new hcall H_EM_GET_PARMS

[PATCH] powerpc: export data from new hcall H_EM_GET_PARMS

[Vaidyanathan Srinivasan]

Hi,

A new hcall H_EM_GET_PARMS as been added to obtain power mode data
from the platform.  This data can be used by user space administrative
tools for better power management.

The following patch add data from this new hcall into the lparcfg
driver and exports to user space along with other existing lpar data
in /proc/powerpc/lparcfg

Please review and include in powerpc tree.

Thanks,
Vaidy

---
    	powerpc: export data from new hcall H_EM_GET_PARMS
    
        Add support for H_EM_GET_PARM hcall that will return data
        related to power modes from the platform.  Export the data
        directly to user space for administrative tools to interpret
        and use.
    
    	cat /proc/powerpc/lparcfg will export power mode data
    
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/hvcall.h |    1 +
 arch/powerpc/kernel/lparcfg.c     |   19 ++++++++++++++++++-
 2 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/include/asm/hvcall.h b/arch/powerpc/include/asm/hvcall.h
index f027581..ebe7493 100644
--- a/arch/powerpc/include/asm/hvcall.h
+++ b/arch/powerpc/include/asm/hvcall.h
@@ -228,6 +228,7 @@
 #define H_JOIN			0x298
 #define H_VASI_STATE            0x2A4
 #define H_ENABLE_CRQ		0x2B0
+#define H_GET_EM_PARMS		0x2B8
 #define H_SET_MPP		0x2D0
 #define H_GET_MPP		0x2D4
 #define MAX_HCALL_OPCODE	H_GET_MPP
diff --git a/arch/powerpc/kernel/lparcfg.c b/arch/powerpc/kernel/lparcfg.c
index 79a00bb..2e7dd7e 100644
--- a/arch/powerpc/kernel/lparcfg.c
+++ b/arch/powerpc/kernel/lparcfg.c
@@ -37,7 +37,7 @@
 #include <asm/vio.h>
 #include <asm/mmu.h>
 
-#define MODULE_VERS "1.8"
+#define MODULE_VERS "1.9"
 #define MODULE_NAME "lparcfg"
 
 /* #define LPARCFG_DEBUG */
@@ -486,6 +486,21 @@ static void splpar_dispatch_data(struct seq_file *m)
 	seq_printf(m, "dispatch_dispersions=%lu\n", dispatch_dispersions);
 }
 
+
+static void parse_em_data(struct seq_file *m)
+{
+	int rc;
+	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+
+	rc = plpar_hcall(H_GET_EM_PARMS, retbuf);
+
+	if (rc != H_SUCCESS)
+		return;
+
+	seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
+	return;
+
+}
 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 {
 	int partition_potential_processors;
@@ -540,6 +555,8 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v)
 
 	seq_printf(m, "slb_size=%d\n", mmu_slb_size);
 
+	parse_em_data(m);
+
 	return 0;
 }