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2016-12-13Merge tag 'pm-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafa...Linus Torvalds
2016-12-13Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/l...Linus Torvalds
2016-12-12Merge branch 'x86-idle-for-linus' of git://git.kernel.org/pub/scm/linux/kerne...Linus Torvalds
2016-12-12Merge powerclamp driver updates (that depend on cpuidle material) for v4.10.Rafael J. Wysocki
2016-12-09x86: Remove empty idle.h headerThomas Gleixner
2016-11-30Merge branches 'thermal-core', 'thermal-intel', 'thermal-soc-fixes' and 'ther...Zhang Rui
2016-11-30thermal/x86 pkg temp: Convert to hotplug state machineSebastian Andrzej Siewior
2016-11-30thermal/x86_pkg_temp: Sanitize package managementThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Move work into package structThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Move work scheduled flag into package structThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Sanitize lockingThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Cleanup code some moreThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Cleanup namespaceThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Get rid of ref countingThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Sanitize callback (de)initializationThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Replace open coded cpu searchThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Remove redundant package searchThomas Gleixner
2016-11-30thermal/x86_pkg_temp: Cleanup thermal interrupt handlingThomas Gleixner
2016-11-30thermal: hwmon: Properly report critical temperature in sysfsKrzysztof Kozlowski
2016-11-29thermal/intel_powerclamp: stop sched tick in forced idleJacob Pan
2016-11-29thermal/intel_powerclamp: Convert to CPU hotplug stateSebastian Andrzej Siewior
2016-11-29thermal/intel_powerclamp: Convert the kthread to kthread worker APIPetr Mladek
2016-11-29thermal/intel_powerclamp: Remove duplicated code that starts the kthreadPetr Mladek
2016-11-26Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2016-11-23devfreq_cooling: pass a pointer to devfreq in the power model callbacksJavi Merino
2016-11-23thermal: rockchip: improve the warning logShawn Lin
2016-11-23thermal: db8500: Fix module autoloadJavier Martinez Canillas
2016-11-23thermal: tango: Fix module autoloadJavier Martinez Canillas
2016-11-23thermal: max77620: Fix module autoloadJavier Martinez Canillas
2016-11-23thermal: qcom-spmi: Treat reg property as a single cellStephen Boyd
2016-11-23thermal: hisilicon: fix for dependencyLeo Yan
2016-11-23thermal: ti-soc-thermal: add missing clk_put()Luis Henriques
2016-11-23thermal: core: move slop and offset helpers to thermal_helpers.cEduardo Valentin
2016-11-23thermal: sysfs: use kcalloc() instead of kzalloc()Eduardo Valentin
2016-11-23thermal: core: use kzalloc(sizeof(*ptr),...)Eduardo Valentin
2016-11-23thermal: core: improve kerneldoc entry of thermal_cooling_device_unregisterEduardo Valentin
2016-11-23thermal: core: remove style warnings and checksEduardo Valentin
2016-11-23thermal: core: remove void function return statementsEduardo Valentin
2016-11-23thermal: core: standardize line breaking alignmentEduardo Valentin
2016-11-23thermal: core: small style fix when checking for __find_governor()Eduardo Valentin
2016-11-23thermal: core: remove FSF address in the GPL noticeEduardo Valentin
2016-11-23thermal: sysfs: remove symbols of emul_temp when config is disabledEduardo Valentin
2016-11-23thermal: core: add a comment describing the device management sectionEduardo Valentin
2016-11-23thermal: core: add a comment describing the power actor sectionEduardo Valentin
2016-11-23thermal: core: add a comment describing the main update loopEduardo Valentin
2016-11-23thermal: core: move notify to the zone update sectionEduardo Valentin
2016-11-23thermal: core: add inline to print_bind_err_msg()Eduardo Valentin
2016-11-23thermal: core: move __bind() to where it is usedEduardo Valentin
2016-11-23thermal: core: fix couple of style issues on __bind() helperEduardo Valentin
2016-11-23thermal: core: move bind_tz() to where it is usedEduardo Valentin
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright © 2017 Keith Packard <keithp@keithp.com>
 */
#include <linux/file.h>
#include <linux/uaccess.h>

#include <drm/drm_auth.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_lease.h>
#include <drm/drm_print.h>

#include "drm_crtc_internal.h"
#include "drm_internal.h"
#include "drm_legacy.h"

#define drm_for_each_lessee(lessee, lessor) \
	list_for_each_entry((lessee), &(lessor)->lessees, lessee_list)

static uint64_t drm_lease_idr_object;

/**
 * drm_lease_owner - return ancestor owner drm_master
 * @master: drm_master somewhere within tree of lessees and lessors
 *
 * RETURN:
 *
 * drm_master at the top of the tree (i.e, with lessor NULL
 */
struct drm_master *drm_lease_owner(struct drm_master *master)
{
	while (master->lessor != NULL)
		master = master->lessor;
	return master;
}

/**
 * _drm_find_lessee - find lessee by id (idr_mutex held)
 * @master: drm_master of lessor
 * @lessee_id: id
 *
 * RETURN:
 *
 * drm_master of the lessee if valid, NULL otherwise
 */

static struct drm_master*
_drm_find_lessee(struct drm_master *master, int lessee_id)
{
	lockdep_assert_held(&master->dev->mode_config.idr_mutex);
	return idr_find(&drm_lease_owner(master)->lessee_idr, lessee_id);
}

/**
 * _drm_lease_held_master - check to see if an object is leased (or owned) by master (idr_mutex held)
 * @master: the master to check the lease status of
 * @id: the id to check
 *
 * Checks if the specified master holds a lease on the object. Return
 * value:
 *
 *	true		'master' holds a lease on (or owns) the object
 *	false		'master' does not hold a lease.
 */
static int _drm_lease_held_master(struct drm_master *master, int id)
{
	lockdep_assert_held(&master->dev->mode_config.idr_mutex);
	if (master->lessor)
		return idr_find(&master->leases, id) != NULL;
	return true;
}

/**
 * _drm_has_leased - check to see if an object has been leased (idr_mutex held)
 * @master: the master to check the lease status of
 * @id: the id to check
 *
 * Checks if any lessee of 'master' holds a lease on 'id'. Return
 * value:
 *
 *	true		Some lessee holds a lease on the object.
 *	false		No lessee has a lease on the object.
 */
static bool _drm_has_leased(struct drm_master *master, int id)
{
	struct drm_master *lessee;

	lockdep_assert_held(&master->dev->mode_config.idr_mutex);
	drm_for_each_lessee(lessee, master)
		if (_drm_lease_held_master(lessee, id))
			return true;
	return false;
}

/**
 * _drm_lease_held - check drm_mode_object lease status (idr_mutex held)
 * @file_priv: the master drm_file
 * @id: the object id
 *
 * Checks if the specified master holds a lease on the object. Return
 * value:
 *
 *	true		'master' holds a lease on (or owns) the object
 *	false		'master' does not hold a lease.
 */
bool _drm_lease_held(struct drm_file *file_priv, int id)
{
	if (!file_priv || !file_priv->master)
		return true;

	return _drm_lease_held_master(file_priv->master, id);
}

/**
 * drm_lease_held - check drm_mode_object lease status (idr_mutex not held)
 * @file_priv: the master drm_file
 * @id: the object id
 *
 * Checks if the specified master holds a lease on the object. Return
 * value:
 *
 *	true		'master' holds a lease on (or owns) the object
 *	false		'master' does not hold a lease.
 */
bool drm_lease_held(struct drm_file *file_priv, int id)
{
	struct drm_master *master;
	bool ret;

	if (!file_priv || !file_priv->master || !file_priv->master->lessor)
		return true;

	master = file_priv->master;
	mutex_lock(&master->dev->mode_config.idr_mutex);
	ret = _drm_lease_held_master(master, id);
	mutex_unlock(&master->dev->mode_config.idr_mutex);
	return ret;
}

/**
 * drm_lease_filter_crtcs - restricted crtc set to leased values (idr_mutex not held)
 * @file_priv: requestor file
 * @crtcs_in: bitmask of crtcs to check
 *
 * Reconstructs a crtc mask based on the crtcs which are visible
 * through the specified file.
 */
uint32_t drm_lease_filter_crtcs(struct drm_file *file_priv, uint32_t crtcs_in)
{
	struct drm_master *master;
	struct drm_device *dev;
	struct drm_crtc *crtc;
	int count_in, count_out;
	uint32_t crtcs_out = 0;

	if (!file_priv || !file_priv->master || !file_priv->master->lessor)
		return crtcs_in;

	master = file_priv->master;
	dev = master->dev;

	count_in = count_out = 0;
	mutex_lock(&master->dev->mode_config.idr_mutex);
	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
		if (_drm_lease_held_master(master, crtc->base.id)) {
			uint32_t mask_in = 1ul << count_in;

			if ((crtcs_in & mask_in) != 0) {
				uint32_t mask_out = 1ul << count_out;

				crtcs_out |= mask_out;
			}
			count_out++;
		}
		count_in++;
	}
	mutex_unlock(&master->dev->mode_config.idr_mutex);
	return crtcs_out;
}

/*
 * drm_lease_create - create a new drm_master with leased objects (idr_mutex not held)
 * @lessor: lease holder (or owner) of objects
 * @leases: objects to lease to the new drm_master
 *
 * Uses drm_master_create to allocate a new drm_master, then checks to
 * make sure all of the desired objects can be leased, atomically
 * leasing them to the new drmmaster.
 *
 * 	ERR_PTR(-EACCES)	some other master holds the title to any object
 * 	ERR_PTR(-ENOENT)	some object is not a valid DRM object for this device
 * 	ERR_PTR(-EBUSY)		some other lessee holds title to this object
 *	ERR_PTR(-EEXIST)	same object specified more than once in the provided list
 *	ERR_PTR(-ENOMEM)	allocation failed
 */
static struct drm_master *drm_lease_create(struct drm_master *lessor, struct idr *leases)
{
	struct drm_device *dev = lessor->dev;
	int error;
	struct drm_master *lessee;
	int object;
	int id;
	void *entry;

	DRM_DEBUG_LEASE("lessor %d\n", lessor->lessee_id);

	lessee = drm_master_create(lessor->dev);
	if (!lessee) {
		DRM_DEBUG_LEASE("drm_master_create failed\n");
		return ERR_PTR(-ENOMEM);
	}

	mutex_lock(&dev->mode_config.idr_mutex);

	idr_for_each_entry(leases, entry, object) {
		error = 0;
		if (!idr_find(&dev->mode_config.object_idr, object))
			error = -ENOENT;
		else if (_drm_has_leased(lessor, object))
			error = -EBUSY;

		if (error != 0) {
			DRM_DEBUG_LEASE("object %d failed %d\n", object, error);
			goto out_lessee;
		}
	}

	/* Insert the new lessee into the tree */
	id = idr_alloc(&(drm_lease_owner(lessor)->lessee_idr), lessee, 1, 0, GFP_KERNEL);
	if (id < 0) {
		error = id;
		goto out_lessee;
	}

	lessee->lessee_id = id;
	lessee->lessor =