linux-kernel - [PATCH] powerpc/kernel/sysfs: Export ldbar spr to sysfs

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Date:   Fri, 27 Oct 2017 15:04:50 +0530
From:   Anju T Sudhakar <anju@...ux.vnet.ibm.com>
To:     mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        maddy@...ux.vnet.ibm.com, anju@...ux.vnet.ibm.com
Subject: [PATCH] powerpc/kernel/sysfs: Export ldbar spr to sysfs

Add ldbar spr to sysfs. The spr will hold thread level In-Memory Collection (IMC)
counter configuration data.

Signed-off-by: Anju T Sudhakar <anju@...ux.vnet.ibm.com>
Acked-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/sysfs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 4437c70c7c2b..8efcaece4796 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -466,6 +466,7 @@ static ssize_t __used \
 #ifdef HAS_PPC_PMC_CLASSIC
 SYSFS_PMCSETUP(mmcr0, SPRN_MMCR0);
 SYSFS_PMCSETUP(mmcr1, SPRN_MMCR1);
+SYSFS_PMCSETUP(ldbar, SPRN_LDBAR);
 SYSFS_PMCSETUP(pmc1, SPRN_PMC1);
 SYSFS_PMCSETUP(pmc2, SPRN_PMC2);
 SYSFS_PMCSETUP(pmc3, SPRN_PMC3);
@@ -492,6 +493,7 @@ SYSFS_SPRSETUP(pir, SPRN_PIR);
   Lets be conservative and default to pseries.
 */
 static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
+static DEVICE_ATTR(ldbar, 0600, show_ldbar, store_ldbar);
 static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
 static DEVICE_ATTR(purr, 0400, show_purr, store_purr);
 static DEVICE_ATTR(pir, 0400, show_pir, NULL);
@@ -757,6 +759,9 @@ static int register_cpu_online(unsigned int cpu)
 			device_create_file(s, &pmc_attrs[i]);
 
 #ifdef CONFIG_PPC64
+	if (cpu_has_feature(CPU_FTR_ARCH_300))
+		device_create_file(s, &dev_attr_ldbar);
+
 	if (cpu_has_feature(CPU_FTR_MMCRA))
 		device_create_file(s, &dev_attr_mmcra);
 
@@ -842,6 +847,9 @@ static int unregister_cpu_online(unsigned int cpu)
 			device_remove_file(s, &pmc_attrs[i]);
 
 #ifdef CONFIG_PPC64
+	if (cpu_has_feature(CPU_FTR_ARCH_300))
+		device_remove_file(s, &dev_attr_ldbar);
+
 	if (cpu_has_feature(CPU_FTR_MMCRA))
 		device_remove_file(s, &dev_attr_mmcra);
 
-- 
2.14.1