[PATCH] powerpc/kernel/sysfs: disable writing to purr in non-powernv

[Madhavan Srinivasan <maddy@linux.vnet.ibm.com>]

powerpc/kernel/sysfs.c exports purr with write permission.
This may be valid for powernv kernel since purr is Hyp resource.
But writing to the file in PowerVM lpar causes crash.

# echo 0 > purr
cpu 0x0: Vector: 700 (Program Check) at [c000000000d072b0]
    pc: c00000000001770c: .write_purr+0x1c/0x40
    lr: c000000000017708: .write_purr+0x18/0x40
    sp: c000000000d07530
   msr: 8000000000049032
  current = 0xc000000000c53de0
  paca    = 0xc00000000ec70000	 softe: 0	 irq_happened: 0x01
    pid   = 0, comm = swapper/0
enter ? for help
[c000000000d075b0] c0000000000fba64
.generic_smp_call_function_single_interrupt+0x104/0x190
[c000000000d07650] c000000000037748 .smp_ipi_demux+0xa8/0xf0
[c000000000d076e0] c000000000035314 .doorbell_exception+0x74/0xb0
[c000000000d07760] c000000000002950 doorbell_super_common+0x150/0x180
--- Exception: a01 (Doorbell) at c000000000060904
.plpar_hcall_norets+0x84/0xd4
[link register   ] c00000000006dbd4 .check_and_cede_processor+0x24/0x40
[c000000000d07a50] c000000001002558 (unreliable)
[c000000000d07ac0] c00000000006dd0c .shared_cede_loop+0x2c/0x70
[c000000000d07b40] c0000000006ae954 .cpuidle_enter_state+0x64/0x150
[c000000000d07c00] c0000000006aeb30 .cpuidle_idle_call+0xf0/0x300
[c000000000d07cb0] c000000000062fa0 .pseries_lpar_idle+0x10/0x50
[c000000000d07d20] c000000000016d14 .arch_cpu_idle+0x64/0x150
[c000000000d07da0] c0000000000e0060 .cpu_startup_entry+0x1a0/0x2c0
[c000000000d07e80] c00000000000bca4 .rest_init+0x94/0xb0
[c000000000d07ef0] c000000000b54530 .start_kernel+0x478/0x494
[c000000000d07f90] c000000000009be0 .start_here_common+0x20/0x40
0:mon>

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/sysfs.c |   19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 27a90b9..d7097c2 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -179,15 +179,27 @@ SYSFS_PMCSETUP(spurr, SPRN_SPURR);
 SYSFS_PMCSETUP(dscr, SPRN_DSCR);
 SYSFS_PMCSETUP(pir, SPRN_PIR);
 
+/*
+  Lets only enable Read for Hyp resources and
+  enable Write when needed with a separate function.
+  Lets be conservative and default to pseries.
+*/
 static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
 static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
 static DEVICE_ATTR(dscr, 0600, show_dscr, store_dscr);
-static DEVICE_ATTR(purr, 0600, show_purr, store_purr);
+static DEVICE_ATTR(purr, 0400, show_purr, store_purr);
 static DEVICE_ATTR(pir, 0400, show_pir, NULL);
 
 unsigned long dscr_default = 0;
 EXPORT_SYMBOL(dscr_default);
 
+static void add_write_permission_dev_attr(void *ptr)
+{
+	struct device_attribute *attr = (struct device_attribute *)ptr;
+
+	attr->attr.mode |= (unsigned short) 0200;
+}
+
 static ssize_t show_dscr_default(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -394,8 +406,11 @@ static void register_cpu_online(unsigned int cpu)
 	if (cpu_has_feature(CPU_FTR_MMCRA))
 		device_create_file(s, &dev_attr_mmcra);
 
-	if (cpu_has_feature(CPU_FTR_PURR))
+	if (cpu_has_feature(CPU_FTR_PURR)) {
+		if (machine_is(powernv))
+			add_write_permission_dev_attr((void *)&dev_attr_purr);
 		device_create_file(s, &dev_attr_purr);
+	}
 
 	if (cpu_has_feature(CPU_FTR_SPURR))
 		device_create_file(s, &dev_attr_spurr);
-- 
1.7.10.4