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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-12 11:50:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-12 11:50:33 -0800
commitbe23c9d20b341a58ad7107f9e9aa5735cea3da13 (patch)
treeda5e5ede73ccba5e3464821fb0cfb67c027f796a /drivers/base/power
parent5d50ac70fe98518dbf620bfba8184254663125eb (diff)
parentf57ab32a843690fe7431ebb3a2f461e689a2e3c7 (diff)
downloadblackbird-op-linux-be23c9d20b341a58ad7107f9e9aa5735cea3da13.tar.gz
blackbird-op-linux-be23c9d20b341a58ad7107f9e9aa5735cea3da13.zip
Merge tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more power management and ACPI updates from Rafael Wysocki: "The only new feature in this batch is support for the ACPI _CCA device configuration object, which it a pre-requisite for future ACPI PCI support on ARM64, but should not affect the other architectures. The rest is fixes and cleanups, mostly in cpufreq (including intel_pstate), the Operating Performace Points (OPP) framework and tools (cpupower and turbostat). Specifics: - Support for the ACPI _CCA configuration object intended to tell the OS whether or not a bus master device supports hardware managed cache coherency and a new set of functions to allow drivers to check the cache coherency support for devices in a platform firmware interface agnostic way (Suravee Suthikulpanit, Jeremy Linton). - ACPI backlight quirks for ESPRIMO Mobile M9410 and Dell XPS L421X (Aaron Lu, Hans de Goede). - Fixes for the arm_big_little and s5pv210-cpufreq cpufreq drivers (Jon Medhurst, Nicolas Pitre). - kfree()-related fixup for the recently introduced CPPC cpufreq frontend (Markus Elfring). - intel_pstate fix reducing kernel log noise on systems where P-states are managed by hardware (Prarit Bhargava). - intel_pstate maintainers information update (Srinivas Pandruvada). - cpufreq core optimization related to the handling of delayed work items used by governors (Viresh Kumar). - Locking fixes and cleanups of the Operating Performance Points (OPP) framework (Viresh Kumar). - Generic power domains framework cleanups (Lina Iyer). - cpupower tool updates (Jacob Tanenbaum, Sriram Raghunathan, Thomas Renninger). - turbostat tool updates (Len Brown)" * tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits) PCI: ACPI: Add support for PCI device DMA coherency PCI: OF: Move of_pci_dma_configure() to pci_dma_configure() of/pci: Fix pci_get_host_bridge_device leak device property: ACPI: Remove unused DMA APIs device property: ACPI: Make use of the new DMA Attribute APIs device property: Adding DMA Attribute APIs for Generic Devices ACPI: Adding DMA Attribute APIs for ACPI Device device property: Introducing enum dev_dma_attr ACPI: Honor ACPI _CCA attribute setting cpufreq: CPPC: Delete an unnecessary check before the function call kfree() PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp() PM / OPP: Hold dev_opp_list_lock for writers PM / OPP: Protect updates to list_dev with mutex PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus() cpufreq: s5pv210-cpufreq: fix wrong do_div() usage MAINTAINERS: update for intel P-state driver Creating a common structure initialization pattern for struct option cpupower: Enable disabled Cstates if they are below max latency cpupower: Remove debug message when using cpupower idle-set -D switch cpupower: cpupower monitor reports uninitialized values for offline cpus ...
Diffstat (limited to 'drivers/base/power')
-rw-r--r--drivers/base/power/domain.c21
-rw-r--r--drivers/base/power/opp/core.c44
-rw-r--r--drivers/base/power/opp/cpu.c13
-rw-r--r--drivers/base/power/opp/opp.h3
4 files changed, 51 insertions, 30 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 80e298870388..e03b1ad25a90 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -321,8 +321,7 @@ static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
if (stat > PM_QOS_FLAGS_NONE)
return -EBUSY;
- if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
- || pdd->dev->power.irq_safe))
+ if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe)
not_suspended++;
}
@@ -1312,13 +1311,17 @@ int pm_genpd_remove_device(struct generic_pm_domain *genpd,
int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
struct generic_pm_domain *subdomain)
{
- struct gpd_link *link;
+ struct gpd_link *link, *itr;
int ret = 0;
if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
|| genpd == subdomain)
return -EINVAL;
+ link = kzalloc(sizeof(*link), GFP_KERNEL);
+ if (!link)
+ return -ENOMEM;
+
mutex_lock(&genpd->lock);
mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
@@ -1328,18 +1331,13 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
goto out;
}
- list_for_each_entry(link, &genpd->master_links, master_node) {
- if (link->slave == subdomain && link->master == genpd) {
+ list_for_each_entry(itr, &genpd->master_links, master_node) {
+ if (itr->slave == subdomain && itr->master == genpd) {
ret = -EINVAL;
goto out;
}
}
- link = kzalloc(sizeof(*link), GFP_KERNEL);
- if (!link) {
- ret = -ENOMEM;
- goto out;
- }
link->master = genpd;
list_add_tail(&link->master_node, &genpd->master_links);
link->slave = subdomain;
@@ -1350,7 +1348,8 @@ int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
out:
mutex_unlock(&subdomain->lock);
mutex_unlock(&genpd->lock);
-
+ if (ret)
+ kfree(link);
return ret;
}
EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 270902007055..b8e76f75073b 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -11,6 +11,8 @@
* published by the Free Software Foundation.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
@@ -27,7 +29,7 @@
*/
static LIST_HEAD(dev_opp_list);
/* Lock to allow exclusive modification to the device and opp lists */
-static DEFINE_MUTEX(dev_opp_list_lock);
+DEFINE_MUTEX(dev_opp_list_lock);
#define opp_rcu_lockdep_assert() \
do { \
@@ -79,14 +81,18 @@ static struct device_opp *_managed_opp(const struct device_node *np)
* Return: pointer to 'struct device_opp' if found, otherwise -ENODEV or
* -EINVAL based on type of error.
*
- * Locking: This function must be called under rcu_read_lock(). device_opp
- * is a RCU protected pointer. This means that device_opp is valid as long
- * as we are under RCU lock.
+ * Locking: For readers, this function must be called under rcu_read_lock().
+ * device_opp is a RCU protected pointer, which means that device_opp is valid
+ * as long as we are under RCU lock.
+ *
+ * For Writers, this function must be called with dev_opp_list_lock held.
*/
struct device_opp *_find_device_opp(struct device *dev)
{
struct device_opp *dev_opp;
+ opp_rcu_lockdep_assert();
+
if (IS_ERR_OR_NULL(dev)) {
pr_err("%s: Invalid parameters\n", __func__);
return ERR_PTR(-EINVAL);
@@ -701,7 +707,7 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
}
/**
- * _opp_add_dynamic() - Allocate a dynamic OPP.
+ * _opp_add_v1() - Allocate a OPP based on v1 bindings.
* @dev: device for which we do this operation
* @freq: Frequency in Hz for this OPP
* @u_volt: Voltage in uVolts for this OPP
@@ -727,8 +733,8 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
* Duplicate OPPs (both freq and volt are same) and !opp->available
* -ENOMEM Memory allocation failure
*/
-static int _opp_add_dynamic(struct device *dev, unsigned long freq,
- long u_volt, bool dynamic)
+static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
+ bool dynamic)
{
struct device_opp *dev_opp;
struct dev_pm_opp *new_opp;
@@ -770,9 +776,10 @@ unlock:
}
/* TODO: Support multiple regulators */
-static int opp_get_microvolt(struct dev_pm_opp *opp, struct device *dev)
+static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev)
{
u32 microvolt[3] = {0};
+ u32 val;
int count, ret;
/* Missing property isn't a problem, but an invalid entry is */
@@ -805,6 +812,9 @@ static int opp_get_microvolt(struct dev_pm_opp *opp, struct device *dev)
opp->u_volt_min = microvolt[1];
opp->u_volt_max = microvolt[2];
+ if (!of_property_read_u32(opp->np, "opp-microamp", &val))
+ opp->u_amp = val;
+
return 0;
}
@@ -869,13 +879,10 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
if (!of_property_read_u32(np, "clock-latency-ns", &val))
new_opp->clock_latency_ns = val;
- ret = opp_get_microvolt(new_opp, dev);
+ ret = opp_parse_supplies(new_opp, dev);
if (ret)
goto free_opp;
- if (!of_property_read_u32(new_opp->np, "opp-microamp", &val))
- new_opp->u_amp = val;
-
ret = _opp_add(dev, new_opp, dev_opp);
if (ret)
goto free_opp;
@@ -939,7 +946,7 @@ unlock:
*/
int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt)
{
- return _opp_add_dynamic(dev, freq, u_volt, true);
+ return _opp_add_v1(dev, freq, u_volt, true);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_add);
@@ -1172,13 +1179,17 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
struct device_opp *dev_opp;
int ret = 0, count = 0;
+ mutex_lock(&dev_opp_list_lock);
+
dev_opp = _managed_opp(opp_np);
if (dev_opp) {
/* OPPs are already managed */
if (!_add_list_dev(dev, dev_opp))
ret = -ENOMEM;
+ mutex_unlock(&dev_opp_list_lock);
return ret;
}
+ mutex_unlock(&dev_opp_list_lock);
/* We have opp-list node now, iterate over it and add OPPs */
for_each_available_child_of_node(opp_np, np) {
@@ -1196,15 +1207,20 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
if (WARN_ON(!count))
return -ENOENT;
+ mutex_lock(&dev_opp_list_lock);
+
dev_opp = _find_device_opp(dev);
if (WARN_ON(IS_ERR(dev_opp))) {
ret = PTR_ERR(dev_opp);
+ mutex_unlock(&dev_opp_list_lock);
goto free_table;
}
dev_opp->np = opp_np;
dev_opp->shared_opp = of_property_read_bool(opp_np, "opp-shared");
+ mutex_unlock(&dev_opp_list_lock);
+
return 0;
free_table:
@@ -1241,7 +1257,7 @@ static int _of_add_opp_table_v1(struct device *dev)
unsigned long freq = be32_to_cpup(val++) * 1000;
unsigned long volt = be32_to_cpup(val++);
- if (_opp_add_dynamic(dev, freq, volt, false))
+ if (_opp_add_v1(dev, freq, volt, false))
dev_warn(dev, "%s: Failed to add OPP %ld\n",
__func__, freq);
nr -= 2;
diff --git a/drivers/base/power/opp/cpu.c b/drivers/base/power/opp/cpu.c
index 7654c5606307..7b445e88a0d5 100644
--- a/drivers/base/power/opp/cpu.c
+++ b/drivers/base/power/opp/cpu.c
@@ -10,6 +10,9 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/err.h>
@@ -124,12 +127,12 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
struct device *dev;
int cpu, ret = 0;
- rcu_read_lock();
+ mutex_lock(&dev_opp_list_lock);
dev_opp = _find_device_opp(cpu_dev);
if (IS_ERR(dev_opp)) {
ret = -EINVAL;
- goto out_rcu_read_unlock;
+ goto unlock;
}
for_each_cpu(cpu, cpumask) {
@@ -150,10 +153,10 @@ int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
continue;
}
}
-out_rcu_read_unlock:
- rcu_read_unlock();
+unlock:
+ mutex_unlock(&dev_opp_list_lock);
- return 0;
+ return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h
index dcb38f78dae4..7366b2aa8997 100644
--- a/drivers/base/power/opp/opp.h
+++ b/drivers/base/power/opp/opp.h
@@ -21,6 +21,9 @@
#include <linux/rculist.h>
#include <linux/rcupdate.h>
+/* Lock to allow exclusive modification to the device and opp lists */
+extern struct mutex dev_opp_list_lock;
+
/*
* Internal data structure organization with the OPP layer library is as
* follows:
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