Skip to contentSkip to conversation

powerpc: export data from new hcall H_EM_GET_PARMS

PATCH New Vaidyanathan Srinivasan 1 participant 1 message Apr 1, 2010 PowerPC

lore
Share & tools
lore

Vaidyanathan Srinivasan

author
#0 lore raw

PATCH v2 1/1 powerpc: export data from new hcall H_EM_GET_PARMS

Hi Ben,

Previous post: http://patchwork.ozlabs.org/patch/47249/

I have cleaned up the code from the v1:
http://lists.ozlabs.org/pipermail/linuxppc-dev/2010-February/080630.html

Changes from v1:
* Removed redundant return statements and rearranged code

Description:

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 -next tree.

Thanks,
Vaidy

---
powerpc: export data from new hcall H_EM_GET_PARMS

Add support for H_EM_GET_PARMS 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 <[email protected]>
---
 arch/powerpc/include/asm/hvcall.h |    1 +
 arch/powerpc/kernel/lparcfg.c     |   12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletions(-)
arch/powerpc/include/asm/hvcall.h +1 -0
index f027581..ebe7493 100644
@@ -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
arch/powerpc/kernel/lparcfg.c +11 -1
index d09d1c6..ff698fb 100644
@@ -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 +486,14 @@ 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)
+{
+	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
+
+	if (plpar_hcall(H_GET_EM_PARMS, retbuf) == H_SUCCESS)
+		seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
+}
+
 static int pseries_lparcfg_data(struct seq_file *m, void *v)
 {
 	int partition_potential_processors;

@@ -540,6 +548,8 @@ 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;
 }