Re: [PATCH v3] powerpc/kernel/sysfs: Export ldbar spr to sysfs

[Anju T Sudhakar]

Hi,

Kindly ignore this patch, I send a wrong version. Will send out the 
right one.


Thanks,

Anju


On Thursday 09 November 2017 05:43 PM, Anju T Sudhakar wrote:
Add ldbar spr to sysfs. The spr holds thread level In-Memory Collection (IMC)
counter configuration data. Exposing this will help to understand the current
configuration of thread-level counters in the system.
Primarily, Bit 0 of ldbar says whether the counters are enabled or not.
And bit 1 indicates the mode (if 0-Accumulation Mode/if 1-Trace Mode).

Signed-off-by: Anju T Sudhakar <a...@linux.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 4437c70..f8caee0 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -485,6 +485,7 @@ SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
  SYSFS_SPRSETUP(purr, SPRN_PURR);
  SYSFS_SPRSETUP(spurr, SPRN_SPURR);
  SYSFS_SPRSETUP(pir, SPRN_PIR);
+SYSFS_SPRSETUP(ldbar, SPRN_LDBAR);

  /*
    Lets only enable read for phyp resources and
@@ -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, 0400, 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);