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authorGautham R. Shenoy <ego@linux.vnet.ibm.com>2017-03-15 13:45:53 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-03-29 00:14:00 +0200
commitecad4502d090a8630f50a88cbe072b92f3a3229e (patch)
tree5033fedf49cd107350af516effdfec2aeb6908b4 /drivers
parentc02ed2e75ef4c74e41e421acb4ef1494671585e8 (diff)
downloadlinux-ecad4502d090a8630f50a88cbe072b92f3a3229e.tar.bz2
powernv-cpuidle: Validate DT property array size
The various properties associated with powernv idle states such as names, flags, residency-ns, latencies-ns, psscr, psscr-mask are exposed in the device-tree as property arrays such the pointwise entries in each of these arrays correspond to the properties of the same idle state. This patch validates that the lengths of the property arrays are the same. If there is a mismatch, the patch will ensure that we bail out and not expose the platform idle states via cpuidle. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Reviewed-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/cpuidle/cpuidle-powernv.c64
1 files changed, 61 insertions, 3 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 370593006f5f..a06df51a36c0 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -197,11 +197,25 @@ static inline void add_powernv_state(int index, const char *name,
stop_psscr_table[index].mask = psscr_mask;
}
+/*
+ * Returns 0 if prop1_len == prop2_len. Else returns -1
+ */
+static inline int validate_dt_prop_sizes(const char *prop1, int prop1_len,
+ const char *prop2, int prop2_len)
+{
+ if (prop1_len == prop2_len)
+ return 0;
+
+ pr_warn("cpuidle-powernv: array sizes don't match for %s and %s\n",
+ prop1, prop2);
+ return -1;
+}
+
static int powernv_add_idle_states(void)
{
struct device_node *power_mgt;
int nr_idle_states = 1; /* Snooze */
- int dt_idle_states;
+ int dt_idle_states, count;
u32 latency_ns[CPUIDLE_STATE_MAX];
u32 residency_ns[CPUIDLE_STATE_MAX];
u32 flags[CPUIDLE_STATE_MAX];
@@ -226,6 +240,21 @@ static int powernv_add_idle_states(void)
goto out;
}
+ count = of_property_count_u32_elems(power_mgt,
+ "ibm,cpu-idle-state-latencies-ns");
+
+ if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags", dt_idle_states,
+ "ibm,cpu-idle-state-latencies-ns",
+ count) != 0)
+ goto out;
+
+ count = of_property_count_strings(power_mgt,
+ "ibm,cpu-idle-state-names");
+ if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags", dt_idle_states,
+ "ibm,cpu-idle-state-names",
+ count) != 0)
+ goto out;
+
/*
* Since snooze is used as first idle state, max idle states allowed is
* CPUIDLE_STATE_MAX -1
@@ -260,6 +289,22 @@ static int powernv_add_idle_states(void)
has_stop_states = (flags[0] &
(OPAL_PM_STOP_INST_FAST | OPAL_PM_STOP_INST_DEEP));
if (has_stop_states) {
+ count = of_property_count_u64_elems(power_mgt,
+ "ibm,cpu-idle-state-psscr");
+ if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags",
+ dt_idle_states,
+ "ibm,cpu-idle-state-psscr",
+ count) != 0)
+ goto out;
+
+ count = of_property_count_u64_elems(power_mgt,
+ "ibm,cpu-idle-state-psscr-mask");
+ if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags",
+ dt_idle_states,
+ "ibm,cpu-idle-state-psscr-mask",
+ count) != 0)
+ goto out;
+
if (of_property_read_u64_array(power_mgt,
"ibm,cpu-idle-state-psscr", psscr_val, dt_idle_states)) {
pr_warn("cpuidle-powernv: missing ibm,cpu-idle-state-psscr in DT\n");
@@ -274,8 +319,21 @@ static int powernv_add_idle_states(void)
}
}
- rc = of_property_read_u32_array(power_mgt,
- "ibm,cpu-idle-state-residency-ns", residency_ns, dt_idle_states);
+ count = of_property_count_u32_elems(power_mgt,
+ "ibm,cpu-idle-state-residency-ns");
+
+ if (count < 0) {
+ rc = count;
+ } else if (validate_dt_prop_sizes("ibm,cpu-idle-state-flags",
+ dt_idle_states,
+ "ibm,cpu-idle-state-residency-ns",
+ count) != 0) {
+ goto out;
+ } else {
+ rc = of_property_read_u32_array(power_mgt,
+ "ibm,cpu-idle-state-residency-ns",
+ residency_ns, dt_idle_states);
+ }
for (i = 0; i < dt_idle_states; i++) {
unsigned int exit_latency, target_residency;