/*
- * Copyright 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
+ * Copyright 2007-2010 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
#include <linux/miscdevice.h>
-/* Backport work for QoS dependencies (kernel/pm_qos_params.c)
+/*
+ * Backport work for QoS dependencies (kernel/pm_qos_params.c)
+ * pm-qos stuff written by mark gross mgross@linux.intel.com.
+ *
* ipw2100 now makes use of
* pm_qos_add_requirement(),
* pm_qos_update_requirement() and
* pm_qos_remove_requirement() from it
*
- * */
+ * mac80211 uses the network latency to determine if to enable or not
+ * dynamic PS. mac80211 also and registers a notifier for when
+ * the latency changes. Since older kernels do no thave pm-qos stuff
+ * we just implement it completley here and register it upon cfg80211
+ * init. I haven't tested ipw2100 on 2.6.24 though.
+ *
+ * This is copied from the kernel written by mark gross mgross@linux.intel.com
+ */
/*
* locking rule: all changes to target_value or requirements or notifiers lists
static DEFINE_SPINLOCK(pm_qos_lock);
+static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
+ size_t count, loff_t *f_pos);
+static int pm_qos_power_open(struct inode *inode, struct file *filp);
+static int pm_qos_power_release(struct inode *inode, struct file *filp);
+
+static const struct file_operations pm_qos_power_fops = {
+ .write = pm_qos_power_write,
+ .open = pm_qos_power_open,
+ .release = pm_qos_power_release,
+};
+
/* static helper functions */
static s32 max_compare(s32 v1, s32 v2)
{
(unsigned long) extreme_value, NULL);
}
+static int register_pm_qos_misc(struct pm_qos_object *qos)
+{
+ qos->pm_qos_power_miscdev.minor = MISC_DYNAMIC_MINOR;
+ qos->pm_qos_power_miscdev.name = qos->name;
+ qos->pm_qos_power_miscdev.fops = &pm_qos_power_fops;
+
+ return misc_register(&qos->pm_qos_power_miscdev);
+}
+
+static int find_pm_qos_object_by_minor(int minor)
+{
+ int pm_qos_class;
+
+ for (pm_qos_class = 0;
+ pm_qos_class < PM_QOS_NUM_CLASSES; pm_qos_class++) {
+ if (minor ==
+ pm_qos_array[pm_qos_class]->pm_qos_power_miscdev.minor)
+ return pm_qos_class;
+ }
+ return -1;
+}
+
+/**
+ * pm_qos_requirement - returns current system wide qos expectation
+ * @pm_qos_class: identification of which qos value is requested
+ *
+ * This function returns the current target value in an atomic manner.
+ */
+int pm_qos_requirement(int pm_qos_class)
+{
+ int ret_val;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pm_qos_lock, flags);
+ ret_val = pm_qos_array[pm_qos_class]->target_value;
+ spin_unlock_irqrestore(&pm_qos_lock, flags);
+
+ return ret_val;
+}
+EXPORT_SYMBOL_GPL(pm_qos_requirement);
/**
* pm_qos_add_requirement - inserts new qos request into the list
}
EXPORT_SYMBOL_GPL(pm_qos_remove_requirement);
+/**
+ * pm_qos_add_notifier - sets notification entry for changes to target value
+ * @pm_qos_class: identifies which qos target changes should be notified.
+ * @notifier: notifier block managed by caller.
+ *
+ * will register the notifier into a notification chain that gets called
+ * uppon changes to the pm_qos_class target value.
+ */
+ int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
+{
+ int retval;
+
+ retval = blocking_notifier_chain_register(
+ pm_qos_array[pm_qos_class]->notifiers, notifier);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_qos_add_notifier);
+
+/**
+ * pm_qos_remove_notifier - deletes notification entry from chain.
+ * @pm_qos_class: identifies which qos target changes are notified.
+ * @notifier: notifier block to be removed.
+ *
+ * will remove the notifier from the notification chain that gets called
+ * uppon changes to the pm_qos_class target value.
+ */
+int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
+{
+ int retval;
+
+ retval = blocking_notifier_chain_unregister(
+ pm_qos_array[pm_qos_class]->notifiers, notifier);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
+
+#define PID_NAME_LEN sizeof("process_1234567890")
+static char name[PID_NAME_LEN];
+
+static int pm_qos_power_open(struct inode *inode, struct file *filp)
+{
+ int ret;
+ long pm_qos_class;
+
+ pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
+ if (pm_qos_class >= 0) {
+ filp->private_data = (void *)pm_qos_class;
+ sprintf(name, "process_%d", current->pid);
+ ret = pm_qos_add_requirement(pm_qos_class, name,
+ PM_QOS_DEFAULT_VALUE);
+ if (ret >= 0)
+ return 0;
+ }
+
+ return -EPERM;
+}
+
+static int pm_qos_power_release(struct inode *inode, struct file *filp)
+{
+ int pm_qos_class;
+
+ pm_qos_class = (long)filp->private_data;
+ sprintf(name, "process_%d", current->pid);
+ pm_qos_remove_requirement(pm_qos_class, name);
+
+ return 0;
+}
+
+static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
+ size_t count, loff_t *f_pos)
+{
+ s32 value;
+ int pm_qos_class;
+
+ pm_qos_class = (long)filp->private_data;
+ if (count != sizeof(s32))
+ return -EINVAL;
+ if (copy_from_user(&value, buf, sizeof(s32)))
+ return -EFAULT;
+ sprintf(name, "process_%d", current->pid);
+ pm_qos_update_requirement(pm_qos_class, name, value);
+
+ return sizeof(s32);
+}
+
+/*
+ * This initializes pm-qos for older kernels.
+ */
+int compat_pm_qos_power_init(void)
+{
+ int ret = 0;
+
+ ret = register_pm_qos_misc(&cpu_dma_pm_qos);
+ if (ret < 0) {
+ printk(KERN_ERR "pm_qos_param: cpu_dma_latency setup failed\n");
+ return ret;
+ }
+ ret = register_pm_qos_misc(&network_lat_pm_qos);
+ if (ret < 0) {
+ printk(KERN_ERR "pm_qos_param: network_latency setup failed\n");
+ return ret;
+ }
+ ret = register_pm_qos_misc(&network_throughput_pm_qos);
+ if (ret < 0)
+ printk(KERN_ERR
+ "pm_qos_param: network_throughput setup failed\n");
+
+ return ret;
+}
/**
* The following things are out of ./lib/vsprintf.c
projects / ~emulex / tmp / compat / .git / commitdiff