path: root/drivers/gpu/arm/midgard/backend/gpu/mali_kbase_pm_internal.h

/*
 *
 * (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.
 *
 * A copy of the licence is included with the program, and can also be obtained
 * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 *
 */





/**
 * @file mali_kbase_pm_hwaccess_internal.h
 * Power management API definitions used internally by GPU backend
 */

#ifndef _KBASE_BACKEND_PM_INTERNAL_H_
#define _KBASE_BACKEND_PM_INTERNAL_H_

#include <mali_kbase_hwaccess_pm.h>

#include "mali_kbase_pm_ca.h"
#include "mali_kbase_pm_policy.h"


/**
 * The GPU is idle.
 *
 * The OS may choose to turn off idle devices
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_dev_idle(struct kbase_device *kbdev);

/**
 * The GPU is active.
 *
 * The OS should avoid opportunistically turning off the GPU while it is active
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_dev_activate(struct kbase_device *kbdev);

/**
 * Get details of the cores that are present in the device.
 *
 * This function can be called by the active power policy to return a bitmask of
 * the cores (of a specified type) present in the GPU device and also a count of
 * the number of cores.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @param type  The type of core (see the @ref enum kbase_pm_core_type
 *              enumeration)
 *
 * @return The bit mask of cores present
 */
u64 kbase_pm_get_present_cores(struct kbase_device *kbdev,
						enum kbase_pm_core_type type);

/**
 * Get details of the cores that are currently active in the device.
 *
 * This function can be called by the active power policy to return a bitmask of
 * the cores (of a specified type) that are actively processing work (i.e.
 * turned on *and* busy).
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @param type  The type of core (see the @ref enum kbase_pm_core_type
 *              enumeration)
 *
 * @return The bit mask of active cores
 */
u64 kbase_pm_get_active_cores(struct kbase_device *kbdev,
						enum kbase_pm_core_type type);

/**
 * Get details of the cores that are currently transitioning between power
 * states.
 *
 * This function can be called by the active power policy to return a bitmask of
 * the cores (of a specified type) that are currently transitioning between
 * power states.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @param type  The type of core (see the @ref enum kbase_pm_core_type
 *              enumeration)
 *
 * @return The bit mask of transitioning cores
 */
u64 kbase_pm_get_trans_cores(struct kbase_device *kbdev,
						enum kbase_pm_core_type type);

/**
 * Get details of the cores that are currently powered and ready for jobs.
 *
 * This function can be called by the active power policy to return a bitmask of
 * the cores (of a specified type) that are powered and ready for jobs (they may
 * or may not be currently executing jobs).
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @param type  The type of core (see the @ref enum kbase_pm_core_type
 *              enumeration)
 *
 * @return The bit mask of ready cores
 */
u64 kbase_pm_get_ready_cores(struct kbase_device *kbdev,
						enum kbase_pm_core_type type);

/**
 * Turn the clock for the device on, and enable device interrupts.
 *
 * This function can be used by a power policy to turn the clock for the GPU on.
 * It should be modified during integration to perform the necessary actions to
 * ensure that the GPU is fully powered and clocked.
 *
 * @param kbdev     The kbase device structure for the device (must be a valid
 *                  pointer)
 * @param is_resume true if clock on due to resume after suspend,
 *                  false otherwise
 */
void kbase_pm_clock_on(struct kbase_device *kbdev, bool is_resume);

/**
 * Disable device interrupts, and turn the clock for the device off.
 *
 * This function can be used by a power policy to turn the clock for the GPU
 * off. It should be modified during integration to perform the necessary
 * actions to turn the clock off (if this is possible in the integration).
 *
 * @param kbdev      The kbase device structure for the device (must be a valid
 *                   pointer)
 * @param is_suspend true if clock off due to suspend, false otherwise
 *
 * @return true  if clock was turned off
 *         false if clock can not be turned off due to pending page/bus fault
 *               workers. Caller must flush MMU workqueues and retry
 */
bool kbase_pm_clock_off(struct kbase_device *kbdev, bool is_suspend);

/**
 * Enable interrupts on the device.
 *
 * Interrupts are also enabled after a call to kbase_pm_clock_on().
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_enable_interrupts(struct kbase_device *kbdev);

/**
 * Enable interrupts on the device, using the provided mask to set MMU_IRQ_MASK.
 *
 * Interrupts are also enabled after a call to kbase_pm_clock_on().
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @param mask  The mask to use for MMU_IRQ_MASK
 */
void kbase_pm_enable_interrupts_mmu_mask(struct kbase_device *kbdev, u32 mask);

/**
 * Disable interrupts on the device.
 *
 * This prevents delivery of Power Management interrupts to the CPU so that
 * kbase_pm_check_transitions_nolock() will not be called from the IRQ handler
 * until @ref kbase_pm_enable_interrupts or kbase_pm_clock_on() is called.
 *
 * Interrupts are also disabled after a call to kbase_pm_clock_off().
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_disable_interrupts(struct kbase_device *kbdev);

/**
 * kbase_pm_init_hw - Initialize the hardware.
 * @kbdev: The kbase device structure for the device (must be a valid pointer)
 * @flags: Flags specifying the type of PM init
 *
 * This function checks the GPU ID register to ensure that the GPU is supported
 * by the driver and performs a reset on the device so that it is in a known
 * state before the device is used.
 *
 * Return: 0 if the device is supported and successfully reset.
 */
int kbase_pm_init_hw(struct kbase_device *kbdev, unsigned int flags);

/**
 * The GPU has been reset successfully.
 *
 * This function must be called by the GPU interrupt handler when the
 * RESET_COMPLETED bit is set. It signals to the power management initialization
 * code that the GPU has been successfully reset.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_reset_done(struct kbase_device *kbdev);


/**
 * Check if there are any power transitions to make, and if so start them.
 *
 * This function will check the desired_xx_state members of
 * struct kbase_pm_device_data and the actual status of the hardware to see if
 * any power transitions can be made at this time to make the hardware state
 * closer to the state desired by the power policy.
 *
 * The return value can be used to check whether all the desired cores are
 * available, and so whether it's worth submitting a job (e.g. from a Power
 * Management IRQ).
 *
 * Note that this still returns true when desired_xx_state has no
 * cores. That is: of the no cores desired, none were <em>un</em>available. In
 * this case, the caller may still need to try submitting jobs. This is because
 * the Core Availability Policy might have taken us to an intermediate state
 * where no cores are powered, before powering on more cores (e.g. for core
 * rotation)
 *
 * The caller must hold kbase_device::pm::power_change_lock
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @return      non-zero when all desired cores are available. That is,
 *              it's worthwhile for the caller to submit a job.
 * @return      false otherwise
 */
bool kbase_pm_check_transitions_nolock(struct kbase_device *kbdev);

/**
 * Synchronous and locking variant of kbase_pm_check_transitions_nolock()
 *
 * On returning, the desired state at the time of the call will have been met.
 *
 * @note There is nothing to stop the core being switched off by calls to
 * kbase_pm_release_cores() or kbase_pm_unrequest_cores(). Therefore, the
 * caller must have already made a call to
 * kbase_pm_request_cores()/kbase_pm_request_cores_sync() previously.
 *
 * The usual use-case for this is to ensure cores are 'READY' after performing
 * a GPU Reset.
 *
 * Unlike kbase_pm_check_transitions_nolock(), the caller must not hold
 * kbase_device::pm::power_change_lock, because this function will take that
 * lock itself.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_check_transitions_sync(struct kbase_device *kbdev);

/**
 * Variant of kbase_pm_update_cores_state() where the caller must hold
 * kbase_device::pm::power_change_lock
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_update_cores_state_nolock(struct kbase_device *kbdev);

/**
 * Update the desired state of shader cores from the Power Policy, and begin
 * any power transitions.
 *
 * This function will update the desired_xx_state members of
 * struct kbase_pm_device_data by calling into the current Power Policy. It will
 * then begin power transitions to make the hardware acheive the desired shader
 * core state.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_update_cores_state(struct kbase_device *kbdev);

/**
 * Cancel any pending requests to power off the GPU and/or shader cores.
 *
 * This should be called by any functions which directly power off the GPU.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_cancel_deferred_poweroff(struct kbase_device *kbdev);

/**
 * Read the bitmasks of present cores.
 *
 * This information is cached to avoid having to perform register reads whenever
 * the information is required.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbasep_pm_read_present_cores(struct kbase_device *kbdev);

/**
 * Initialize the metrics gathering framework.
 *
 * This must be called before other metric gathering APIs are called.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 *
 * @return 0 on success, error code on error
 */
int kbasep_pm_metrics_init(struct kbase_device *kbdev);

/**
 * Terminate the metrics gathering framework.
 *
 * This must be called when metric gathering is no longer required. It is an
 * error to call any metrics gathering function (other than
 * kbasep_pm_metrics_init) after calling this function.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbasep_pm_metrics_term(struct kbase_device *kbdev);

/**
 * Function to be called by the frame buffer driver to update the vsync metric.
 *
 * This function should be called by the frame buffer driver to update whether
 * the system is hitting the vsync target or not. buffer_updated should be true
 * if the vsync corresponded with a new frame being displayed, otherwise it
 * should be false. This function does not need to be called every vsync, but
 * only when the value of buffer_updated differs from a previous call.
 *
 * @param kbdev          The kbase device structure for the device (must be a
 *                       valid pointer)
 * @param buffer_updated True if the buffer has been updated on this VSync,
 *                       false otherwise
 */
void kbase_pm_report_vsync(struct kbase_device *kbdev, int buffer_updated);

/**
 * Configure the frame buffer device to set the vsync callback.
 *
 * This function should do whatever is necessary for this integration to ensure
 * that kbase_pm_report_vsync is called appropriately.
 *
 * This function will need porting as part of the integration for a device.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_register_vsync_callback(struct kbase_device *kbdev);

/**
 * Free any resources that kbase_pm_register_vsync_callback allocated.
 *
 * This function should perform any cleanup required from the call to
 * kbase_pm_register_vsync_callback. No call backs should occur after this
 * function has returned.
 *
 * This function will need porting as part of the integration for a device.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_unregister_vsync_callback(struct kbase_device *kbdev);

/**
 * Determine whether the DVFS system should change the clock speed of the GPU.
 *
 * This function should be called regularly by the DVFS system to check whether
 * the clock speed of the GPU needs updating. It will return one of three
 * enumerated values of kbase_pm_dvfs_action:
 *
 * @param kbdev                     The kbase device structure for the device
 *                                  (must be a valid pointer)
 * @retval KBASE_PM_DVFS_NOP        The clock does not need changing
 * @retval KBASE_PM_DVFS_CLOCK_UP   The clock frequency should be increased if
 *                                  possible.
 * @retval KBASE_PM_DVFS_CLOCK_DOWN The clock frequency should be decreased if
 *                                  possible.
 */
enum kbase_pm_dvfs_action kbase_pm_get_dvfs_action(struct kbase_device *kbdev);

/**
 * Mark that the GPU cycle counter is needed, if the caller is the first caller
 * then the GPU cycle counters will be enabled along with the l2 cache
 *
 * The GPU must be powered when calling this function (i.e.
 * @ref kbase_pm_context_active must have been called).
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_request_gpu_cycle_counter(struct kbase_device *kbdev);

/**
 * This is a version of the above function
 * (@ref kbase_pm_request_gpu_cycle_counter) suitable for being called when the
 * l2 cache is known to be on and assured to be on until the subsequent call of
 * kbase_pm_release_gpu_cycle_counter such as when a job is submitted. It does
 * not sleep and can be called from atomic functions.
 *
 * The GPU must be powered when calling this function (i.e.
 * @ref kbase_pm_context_active must have been called) and the l2 cache must be
 * powered on.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_request_gpu_cycle_counter_l2_is_on(struct kbase_device *kbdev);

/**
 * Mark that the GPU cycle counter is no longer in use, if the caller is the
 * last caller then the GPU cycle counters will be disabled. A request must have
 * been made before a call to this.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_release_gpu_cycle_counter(struct kbase_device *kbdev);

/**
 * Enables access to the GPU registers before power management has powered up
 * the GPU with kbase_pm_powerup().
 *
 * Access to registers should be done using kbase_os_reg_read/write() at this
 * stage, not kbase_reg_read/write().
 *
 * This results in the power management callbacks provided in the driver
 * configuration to get called to turn on power and/or clocks to the GPU. See
 * @ref kbase_pm_callback_conf.
 *
 * This should only be used before power management is powered up with
 * kbase_pm_powerup()
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_register_access_enable(struct kbase_device *kbdev);

/**
 * Disables access to the GPU registers enabled earlier by a call to
 * kbase_pm_register_access_enable().
 *
 * This results in the power management callbacks provided in the driver
 * configuration to get called to turn off power and/or clocks to the GPU. See
 * @ref kbase_pm_callback_conf
 *
 * This should only be used before power management is powered up with
 * kbase_pm_powerup()
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 */
void kbase_pm_register_access_disable(struct kbase_device *kbdev);

/* NOTE: kbase_pm_is_suspending is in mali_kbase.h, because it is an inline
 * function */

/**
 * Check if the power management metrics collection is active.
 *
 * Note that this returns if the power management metrics collection was
 * active at the time of calling, it is possible that after the call the metrics
 * collection enable may have changed state.
 *
 * The caller must handle the consequence that the state may have changed.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @return      true if metrics collection was active else false.
 */
bool kbase_pm_metrics_is_active(struct kbase_device *kbdev);

/**
 * Power on the GPU, and any cores that are requested.
 *
 * @param kbdev     The kbase device structure for the device (must be a valid
 *                  pointer)
 * @param is_resume true if power on due to resume after suspend,
 *                  false otherwise
 */
void kbase_pm_do_poweron(struct kbase_device *kbdev, bool is_resume);

/**
 * Power off the GPU, and any cores that have been requested.
 *
 * @param kbdev      The kbase device structure for the device (must be a valid
 *                   pointer)
 * @param is_suspend true if power off due to suspend,
 *                   false otherwise
 * @return true      if power was turned off
 *         false     if power can not be turned off due to pending page/bus
 *                   fault workers. Caller must flush MMU workqueues and retry
 */
bool kbase_pm_do_poweroff(struct kbase_device *kbdev, bool is_suspend);

#ifdef CONFIG_PM_DEVFREQ
void kbase_pm_get_dvfs_utilisation(struct kbase_device *kbdev,
		unsigned long *total, unsigned long *busy);
void kbase_pm_reset_dvfs_utilisation(struct kbase_device *kbdev);
#endif

#ifdef CONFIG_MALI_MIDGARD_DVFS

/**
 * Function provided by platform specific code when DVFS is enabled to allow
 * the power management metrics system to report utilisation.
 *
 * @param kbdev         The kbase device structure for the device (must be a
 *                      valid pointer)
 * @param utilisation   The current calculated utilisation by the metrics
 *                      system.
 * @param util_gl_share The current calculated gl share of utilisation.
 * @param util_cl_share The current calculated cl share of utilisation per core
 *                      group.
 * @return              Returns 0 on failure and non zero on success.
 */

int kbase_platform_dvfs_event(struct kbase_device *kbdev, u32 utilisation,
	u32 util_gl_share, u32 util_cl_share[2]);
#endif

void kbase_pm_power_changed(struct kbase_device *kbdev);

/**
 * Inform the metrics system that an atom is about to be run.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @param katom The atom that is about to be run
 */
void kbase_pm_metrics_run_atom(struct kbase_device *kbdev,
				struct kbase_jd_atom *katom);

/**
 * Inform the metrics system that an atom has been run and is being released.
 *
 * @param kbdev The kbase device structure for the device (must be a valid
 *              pointer)
 * @param katom The atom that is about to be released
 */
void kbase_pm_metrics_release_atom(struct kbase_device *kbdev,
				struct kbase_jd_atom *katom);


#endif /* _KBASE_BACKEND_PM_INTERNAL_H_ */