text: /*
   *
   * (C) COPYRIGHT 2010-2015 ARM Limited. All rights reserved.
   *
   * This program is free software and is provided to you under the terms of the
   * GNU General Public License version 2 as published by the Free Software
   * Foundation, and any use by you of this program is subject to the terms
   * of such GNU licence.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, you can access it online at
   * http://www.gnu.org/licenses/gpl-2.0.html.
   *
   * SPDX-License-Identifier: GPL-2.0
   *
   */
  
  /*
   * Power policy API definitions
   */
  
  #ifndef _KBASE_PM_POLICY_H_
  #define _KBASE_PM_POLICY_H_
  
  /**
   * kbase_pm_policy_init - Initialize power policy framework
   *
   * @kbdev: The kbase device structure for the device (must be a valid pointer)
   *
   * Must be called before calling any other policy function
   *
   * Return: 0 if the power policy framework was successfully
   *         initialized, -errno otherwise.
   */
  int kbase_pm_policy_init(struct kbase_device *kbdev);
  
  /**
   * kbase_pm_policy_term - Terminate power policy framework
   *
   * @kbdev: The kbase device structure for the device (must be a valid pointer)
   */
  void kbase_pm_policy_term(struct kbase_device *kbdev);
  
  /**
   * kbase_pm_update_active - Update the active power state of the GPU
   *
   * @kbdev: The kbase device structure for the device (must be a valid pointer)
   *
   * Calls into the current power policy
   */
  void kbase_pm_update_active(struct kbase_device *kbdev);
  
  /**
   * kbase_pm_update_cores - Update the desired core state of the GPU
   *
   * @kbdev: The kbase device structure for the device (must be a valid pointer)
   *
   * Calls into the current power policy
   */
  void kbase_pm_update_cores(struct kbase_device *kbdev);
  
  
  enum kbase_pm_cores_ready {
  	KBASE_CORES_NOT_READY = 0,
  	KBASE_NEW_AFFINITY = 1,
  	KBASE_CORES_READY = 2
  };
  
  
  /**
   * kbase_pm_request_cores_sync - Synchronous variant of kbase_pm_request_cores()
   *
   * @kbdev:          The kbase device structure for the device
   * @tiler_required: true if the tiler is required, false otherwise
   * @shader_cores:   A bitmask of shader cores which are necessary for the job
   *
   * When this function returns, the @shader_cores will be in the READY state.
   *
   * This is safe variant of kbase_pm_check_transitions_sync(): it handles the
   * work of ensuring the requested cores will remain powered until a matching
   * call to kbase_pm_unrequest_cores()/kbase_pm_release_cores() (as appropriate)
   * is made.
   */
  void kbase_pm_request_cores_sync(struct kbase_device *kbdev,
  				bool tiler_required, u64 shader_cores);
  
  /**
   * kbase_pm_request_cores - Mark one or more cores as being required
   *                          for jobs to be submitted
   *
   * @kbdev:          The kbase device structure for the device
   * @tiler_required: true if the tiler is required, false otherwise
   * @shader_cores:   A bitmask of shader cores which are necessary for the job
   *
   * This function is called by the job scheduler to mark one or more cores as
   * being required to submit jobs that are ready to run.
   *
   * The cores requested are reference counted and a subsequent call to
   * kbase_pm_register_inuse_cores() or kbase_pm_unrequest_cores() should be
   * made to dereference the cores as being 'needed'.
   *
   * The active power policy will meet or exceed the requirements of the
   * requested cores in the system. Any core transitions needed will be begun
   * immediately, but they might not complete/the cores might not be available
   * until a Power Management IRQ.
   *
   * Return: 0 if the cores were successfully requested, or -errno otherwise.
   */
  void kbase_pm_request_cores(struct kbase_device *kbdev,
  				bool tiler_required, u64 shader_cores);
  
  /**
   * kbase_pm_unrequest_cores - Unmark one or more cores as being required for
   *                            jobs to be submitted.
   *
   * @kbdev:          The kbase device structure for the device
   * @tiler_required: true if the tiler is required, false otherwise
   * @shader_cores:   A bitmask of shader cores (as given to
   *                  kbase_pm_request_cores() )
   *
   * This function undoes the effect of kbase_pm_request_cores(). It should be
   * used when a job is not going to be submitted to the hardware (e.g. the job is
   * cancelled before it is enqueued).
   *
   * The active power policy will meet or exceed the requirements of the
   * requested cores in the system. Any core transitions needed will be begun
   * immediately, but they might not complete until a Power Management IRQ.
   *
   * The policy may use this as an indication that it can power down cores.
   */
  void kbase_pm_unrequest_cores(struct kbase_device *kbdev,
  				bool tiler_required, u64 shader_cores);
  
  /**
   * kbase_pm_register_inuse_cores - Register a set of cores as in use by a job
   *
   * @kbdev:          The kbase device structure for the device
   * @tiler_required: true if the tiler is required, false otherwise
   * @shader_cores:   A bitmask of shader cores (as given to
   *                  kbase_pm_request_cores() )
   *
   * This function should be called after kbase_pm_request_cores() when the job
   * is about to be submitted to the hardware. It will check that the necessary
   * cores are available and if so update the 'needed' and 'inuse' bitmasks to
   * reflect that the job is now committed to being run.
   *
   * If the necessary cores are not currently available then the function will
   * return %KBASE_CORES_NOT_READY and have no effect.
   *
   * Return: %KBASE_CORES_NOT_READY if the cores are not immediately ready,
   *
   *         %KBASE_NEW_AFFINITY if the affinity requested is not allowed,
   *
   *         %KBASE_CORES_READY if the cores requested are already available
   */
  enum kbase_pm_cores_ready kbase_pm_register_inuse_cores(
  						struct kbase_device *kbdev,
  						bool tiler_required,
  						u64 shader_cores);
  
  /**
   * kbase_pm_release_cores - Release cores after a job has run
   *
   * @kbdev:          The kbase device structure for the device
   * @tiler_required: true if the tiler is required, false otherwise
   * @shader_cores:   A bitmask of shader cores (as given to
   *                  kbase_pm_register_inuse_cores() )
   *
   * This function should be called when a job has finished running on the
   * hardware. A call to kbase_pm_register_inuse_cores() must have previously
   * occurred. The reference counts of the specified cores will be decremented
   * which may cause the bitmask of 'inuse' cores to be reduced. The power policy
   * may then turn off any cores which are no longer 'inuse'.
   */
  void kbase_pm_release_cores(struct kbase_device *kbdev,
  				bool tiler_required, u64 shader_cores);
  
  /**
   * kbase_pm_request_l2_caches - Request l2 caches
   *
   * @kbdev: The kbase device structure for the device (must be a valid pointer)
   *
   * Request the use of l2 caches for all core groups, power up, wait and prevent
   * the power manager from powering down the l2 caches.
   *
   * This tells the power management that the caches should be powered up, and
   * they should remain powered, irrespective of the usage of shader cores. This
   * does not return until the l2 caches are powered up.
   *
   * The caller must call kbase_pm_release_l2_caches() when they are finished
   * to allow normal power management of the l2 caches to resume.
   *
   * This should only be used when power management is active.
   */
  void kbase_pm_request_l2_caches(struct kbase_device *kbdev);
  
  /**
   * kbase_pm_request_l2_caches_l2_is_on - Request l2 caches but don't power on
   *
   * @kbdev: The kbase device structure for the device (must be a valid pointer)
   *
   * Increment the count of l2 users but do not attempt to power on the l2
   *
   * It is the callers responsibility to ensure that the l2 is already powered up
   * and to eventually call kbase_pm_release_l2_caches()
   */
  void kbase_pm_request_l2_caches_l2_is_on(struct kbase_device *kbdev);
  
  /**
   * kbase_pm_request_l2_caches - Release l2 caches
   *
   * @kbdev: The kbase device structure for the device (must be a valid pointer)
   *
   * Release the use of l2 caches for all core groups and allow the power manager
   * to power them down when necessary.
   *
   * This tells the power management that the caches can be powered down if
   * necessary, with respect to the usage of shader cores.
   *
   * The caller must have called kbase_pm_request_l2_caches() prior to a call
   * to this.
   *
   * This should only be used when power management is active.
   */
  void kbase_pm_release_l2_caches(struct kbase_device *kbdev);
  
  #endif /* _KBASE_PM_POLICY_H_ */
  