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stm class/intel_th: Updates for 4.8

Browse source 
These are:
  * runtime power management implementation for both intel_th and stm class
  * semi-random kerneldoc fixes
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Merge tag 'stm-for-greg-20160701' of git://git.kernel.org/pub/scm/linux/kernel/git/ash/stm into char-misc-testing

Alexander writes:

stm class/intel_th: Updates for 4.8

These are:
 * runtime power management implementation for both intel_th and stm class
 * semi-random kerneldoc fixes
This commit is contained in:
Greg Kroah-Hartman 2016-07-14 12:02:35 +09:00
parent 7f96a82fde bd581f239f
commit b25948afcc
4 changed files with 116 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

54
drivers/hwtracing/intel_th/core.c
View file

@ -23,6 +23,7 @@
#include <linux/debugfs.h>
#include <linux/idr.h>
#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <linux/dma-mapping.h>
#include "intel_th.h"
@ -67,23 +68,33 @@ static int intel_th_probe(struct device *dev)
hubdrv = to_intel_th_driver(hub->dev.driver);
pm_runtime_set_active(dev);
pm_runtime_no_callbacks(dev);
pm_runtime_enable(dev);
ret = thdrv->probe(to_intel_th_device(dev));
if (ret)
return ret;
goto out_pm;
if (thdrv->attr_group) {
ret = sysfs_create_group(&thdev->dev.kobj, thdrv->attr_group);
if (ret) {
thdrv->remove(thdev);
return ret;
}
if (ret)
goto out;
}
if (thdev->type == INTEL_TH_OUTPUT &&
!intel_th_output_assigned(thdev))
/* does not talk to hardware */
ret = hubdrv->assign(hub, thdev);
out:
if (ret)
thdrv->remove(thdev);
out_pm:
if (ret)
pm_runtime_disable(dev);
return ret;
}
@ -103,6 +114,8 @@ static int intel_th_remove(struct device *dev)
if (thdrv->attr_group)
sysfs_remove_group(&thdev->dev.kobj, thdrv->attr_group);
pm_runtime_get_sync(dev);
thdrv->remove(thdev);
if (intel_th_output_assigned(thdev)) {
@ -110,9 +123,14 @@ static int intel_th_remove(struct device *dev)
to_intel_th_driver(dev->parent->driver);
if (hub->dev.driver)
/* does not talk to hardware */
hubdrv->unassign(hub, thdev);
}
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
}
@ -185,6 +203,7 @@ static int intel_th_output_activate(struct intel_th_device *thdev)
{
struct intel_th_driver *thdrv =
to_intel_th_driver_or_null(thdev->dev.driver);
int ret = 0;
if (!thdrv)
return -ENODEV;
@ -192,12 +211,17 @@ static int intel_th_output_activate(struct intel_th_device *thdev)
if (!try_module_get(thdrv->driver.owner))
return -ENODEV;
pm_runtime_get_sync(&thdev->dev);
if (thdrv->activate)
return thdrv->activate(thdev);
ret = thdrv->activate(thdev);
else
intel_th_trace_enable(thdev);
intel_th_trace_enable(thdev);
if (ret)
pm_runtime_put(&thdev->dev);
return 0;
return ret;
}
static void intel_th_output_deactivate(struct intel_th_device *thdev)
@ -213,6 +237,7 @@ static void intel_th_output_deactivate(struct intel_th_device *thdev)
else
intel_th_trace_disable(thdev);
pm_runtime_put(&thdev->dev);
module_put(thdrv->driver.owner);
}
@ -628,6 +653,10 @@ intel_th_alloc(struct device *dev, struct resource *devres,
dev_set_drvdata(dev, th);
pm_runtime_no_callbacks(dev);
pm_runtime_put(dev);
pm_runtime_allow(dev);
err = intel_th_populate(th, devres, ndevres, irq);
if (err)
goto err_chrdev;
@ -635,6 +664,8 @@ intel_th_alloc(struct device *dev, struct resource *devres,
return th;
err_chrdev:
pm_runtime_forbid(dev);
__unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
"intel_th/output");
@ -658,6 +689,9 @@ void intel_th_free(struct intel_th *th)
intel_th_device_remove(th->hub);
pm_runtime_get_sync(th->dev);
pm_runtime_forbid(th->dev);
__unregister_chrdev(th->major, 0, TH_POSSIBLE_OUTPUTS,
"intel_th/output");
@ -682,6 +716,7 @@ int intel_th_trace_enable(struct intel_th_device *thdev)
if (WARN_ON_ONCE(thdev->type != INTEL_TH_OUTPUT))
return -EINVAL;
pm_runtime_get_sync(&thdev->dev);
hubdrv->enable(hub, &thdev->output);
return 0;
@ -702,6 +737,7 @@ int intel_th_trace_disable(struct intel_th_device *thdev)
return -EINVAL;
hubdrv->disable(hub, &thdev->output);
pm_runtime_put(&thdev->dev);
return 0;
}

18
drivers/hwtracing/intel_th/gth.c
View file

@ -22,6 +22,7 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/bitmap.h>
#include <linux/pm_runtime.h>
#include "intel_th.h"
#include "gth.h"
@ -190,6 +191,11 @@ static ssize_t master_attr_store(struct device *dev,
if (old_port >= 0) {
gth->master[ma->master] = -1;
clear_bit(ma->master, gth->output[old_port].master);
/*
* if the port is active, program this setting,
* implies that runtime PM is on
*/
if (gth->output[old_port].output->active)
gth_master_set(gth, ma->master, -1);
}
@ -204,7 +210,7 @@ static ssize_t master_attr_store(struct device *dev,
set_bit(ma->master, gth->output[port].master);
/* if the port is active, program this setting */
/* if the port is active, program this setting, see above */
if (gth->output[port].output->active)
gth_master_set(gth, ma->master, port);
}
@ -326,11 +332,15 @@ static ssize_t output_attr_show(struct device *dev,
struct gth_device *gth = oa->gth;
size_t count;
pm_runtime_get_sync(dev);
spin_lock(&gth->gth_lock);
count = snprintf(buf, PAGE_SIZE, "%x\n",
gth_output_parm_get(gth, oa->port, oa->parm));
spin_unlock(&gth->gth_lock);
pm_runtime_put(dev);
return count;
}
@ -346,10 +356,14 @@ static ssize_t output_attr_store(struct device *dev,
if (kstrtouint(buf, 16, &config) < 0)
return -EINVAL;
pm_runtime_get_sync(dev);
spin_lock(&gth->gth_lock);
gth_output_parm_set(gth, oa->port, oa->parm, config);
spin_unlock(&gth->gth_lock);
pm_runtime_put(dev);
return count;
}
@ -451,7 +465,7 @@ static int intel_th_output_attributes(struct gth_device *gth)
}
/**
* intel_th_gth_disable() - enable tracing to an output device
* intel_th_gth_disable() - disable tracing to an output device
* @thdev: GTH device
* @output: output device's descriptor
*

3
drivers/hwtracing/intel_th/intel_th.h
View file

@ -114,6 +114,9 @@ intel_th_output_assigned(struct intel_th_device *thdev)
* @unassign: deassociate an output type device from an output port
* @enable: enable tracing for a given output device
* @disable: disable tracing for a given output device
* @irq: interrupt callback
* @activate: enable tracing on the output's side
* @deactivate: disable tracing on the output's side
* @fops: file operations for device nodes
* @attr_group: attributes provided by the driver
*

52
drivers/hwtracing/stm/core.c
View file

@ -15,6 +15,7 @@
* as defined in MIPI STPv2 specification.
*/
#include <linux/pm_runtime.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -482,14 +483,40 @@ static ssize_t stm_char_write(struct file *file, const char __user *buf,
return -EFAULT;
}
pm_runtime_get_sync(&stm->dev);
count = stm_write(stm->data, stmf->output.master, stmf->output.channel,
kbuf, count);
pm_runtime_mark_last_busy(&stm->dev);
pm_runtime_put_autosuspend(&stm->dev);
kfree(kbuf);
return count;
}
static void stm_mmap_open(struct vm_area_struct *vma)
{
struct stm_file *stmf = vma->vm_file->private_data;
struct stm_device *stm = stmf->stm;
pm_runtime_get(&stm->dev);
}
static void stm_mmap_close(struct vm_area_struct *vma)
{
struct stm_file *stmf = vma->vm_file->private_data;
struct stm_device *stm = stmf->stm;
pm_runtime_mark_last_busy(&stm->dev);
pm_runtime_put_autosuspend(&stm->dev);
}
static const struct vm_operations_struct stm_mmap_vmops = {
.open = stm_mmap_open,
.close = stm_mmap_close,
};
static int stm_char_mmap(struct file *file, struct vm_area_struct *vma)
{
struct stm_file *stmf = file->private_data;
@ -514,8 +541,11 @@ static int stm_char_mmap(struct file *file, struct vm_area_struct *vma)
if (!phys)
return -EINVAL;
pm_runtime_get_sync(&stm->dev);
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_ops = &stm_mmap_vmops;
vm_iomap_memory(vma, phys, size);
return 0;
@ -701,6 +731,17 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
if (err)
goto err_device;
/*
* Use delayed autosuspend to avoid bouncing back and forth
* on recurring character device writes, with the initial
* delay time of 2 seconds.
*/
pm_runtime_no_callbacks(&stm->dev);
pm_runtime_use_autosuspend(&stm->dev);
pm_runtime_set_autosuspend_delay(&stm->dev, 2000);
pm_runtime_set_suspended(&stm->dev);
pm_runtime_enable(&stm->dev);
return 0;
err_device:
@ -724,6 +765,9 @@ void stm_unregister_device(struct stm_data *stm_data)
struct stm_source_device *src, *iter;
int i, ret;
pm_runtime_dont_use_autosuspend(&stm->dev);
pm_runtime_disable(&stm->dev);
mutex_lock(&stm->link_mutex);
list_for_each_entry_safe(src, iter, &stm->link_list, link_entry) {
ret = __stm_source_link_drop(src, stm);
@ -878,6 +922,8 @@ static int __stm_source_link_drop(struct stm_source_device *src,
stm_output_free(link, &src->output);
list_del_init(&src->link_entry);
pm_runtime_mark_last_busy(&link->dev);
pm_runtime_put_autosuspend(&link->dev);
/* matches stm_find_device() from stm_source_link_store() */
stm_put_device(link);
rcu_assign_pointer(src->link, NULL);
@ -971,8 +1017,11 @@ static ssize_t stm_source_link_store(struct device *dev,
if (!link)
return -EINVAL;
pm_runtime_get(&link->dev);
err = stm_source_link_add(src, link);
if (err) {
pm_runtime_put_autosuspend(&link->dev);
/* matches the stm_find_device() above */
stm_put_device(link);
}
@ -1033,6 +1082,9 @@ int stm_source_register_device(struct device *parent,
if (err)
goto err;
pm_runtime_no_callbacks(&src->dev);
pm_runtime_forbid(&src->dev);
err = device_add(&src->dev);
if (err)
goto err;