drm: Extract&Document drm_irq.h (34a67dd7) · Commits · 戴 / test

Documentation/gpu/drm-kms.rst

+2 −2

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		@@ -649,5 +649,5 @@ Vertical Blanking and Interrupt Handling Functions Reference
		.. kernel-doc:: drivers/gpu/drm/drm_irq.c
		:export:

		.. kernel-doc:: include/drm/drmP.h
		:functions: drm_crtc_vblank_waitqueue
		.. kernel-doc:: include/drm/drm_irq.h
		:internal:

drivers/gpu/drm/drm_irq.c

+0 −1

Original line number	Diff line number	Diff line
		@@ -1695,7 +1695,6 @@ int drm_wait_vblank(struct drm_device dev, void data,

		DRM_DEBUG("waiting on vblank count %d, crtc %u\n",
		vblwait->request.sequence, pipe);
		vblank->last_wait = vblwait->request.sequence;
		DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
		(((drm_vblank_count(dev, pipe) -
		vblwait->request.sequence) <= (1 << 23)) \|\|

include/drm/drmP.h

+3 −80

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		@@ -52,7 +52,6 @@
		#include <linux/poll.h>
		#include <linux/ratelimit.h>
		#include <linux/sched.h>
		#include <linux/seqlock.h>
		#include <linux/slab.h>
		#include <linux/types.h>
		#include <linux/vmalloc.h>
		@@ -87,6 +86,7 @@ struct drm_device_dma;
		struct drm_dma_handle;
		struct drm_gem_object;
		struct drm_master;
		struct drm_vblank_crtc;

		struct device_node;
		struct videomode;
		@@ -684,35 +684,6 @@ struct drm_minor {
		struct mutex debugfs_lock; /* Protects debugfs_list. */
		};


		struct drm_pending_vblank_event {
		struct drm_pending_event base;
		unsigned int pipe;
		struct drm_event_vblank event;
		};

		struct drm_vblank_crtc {
		struct drm_device dev; / pointer to the drm_device */
		wait_queue_head_t queue; /*< VBLANK wait queue /
		struct timer_list disable_timer; /* delayed disable timer */

		seqlock_t seqlock; /* protects vblank count and time */

		u32 count; /* vblank counter */
		struct timeval time; /* vblank timestamp */

		atomic_t refcount; /* number of users of vblank interruptsper crtc */
		u32 last; /* protected by dev->vbl_lock, used */
		/* for wraparound handling */
		u32 last_wait; /* Last vblank seqno waited per CRTC */
		unsigned int inmodeset; /* Display driver is setting mode */
		unsigned int pipe; /* crtc index */
		int framedur_ns; /* frame/field duration in ns */
		int linedur_ns; /* line duration in ns */
		bool enabled; /* so we don't call enable more than
		once per disable */
		};

		/**
		* DRM device structure. This structure represent a complete card that
		* may contain multiple heads.
		@@ -847,6 +818,8 @@ struct drm_device {
		int switch_power_state;
		};

		#include <drm/drm_irq.h>

		#define DRM_SWITCH_POWER_ON 0
		#define DRM_SWITCH_POWER_OFF 1
		#define DRM_SWITCH_POWER_CHANGING 2
		@@ -933,56 +906,6 @@ void drm_clflush_virt_range(void *addr, unsigned long length);
		* DMA quiscent + idle. DMA quiescent usually requires the hardware lock.
		*/

		/* IRQ support (drm_irq.h) */
		extern int drm_irq_install(struct drm_device *dev, int irq);
		extern int drm_irq_uninstall(struct drm_device *dev);

		extern int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
		extern int drm_wait_vblank(struct drm_device dev, void data,
		struct drm_file *filp);
		extern u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe);
		extern u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
		extern u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
		struct timeval *vblanktime);
		extern void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
		struct drm_pending_vblank_event *e);
		extern void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
		struct drm_pending_vblank_event *e);
		extern bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
		extern bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
		extern int drm_crtc_vblank_get(struct drm_crtc *crtc);
		extern void drm_crtc_vblank_put(struct drm_crtc *crtc);
		extern void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
		extern void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
		extern void drm_vblank_off(struct drm_device *dev, unsigned int pipe);
		extern void drm_vblank_on(struct drm_device *dev, unsigned int pipe);
		extern void drm_crtc_vblank_off(struct drm_crtc *crtc);
		extern void drm_crtc_vblank_reset(struct drm_crtc *crtc);
		extern void drm_crtc_vblank_on(struct drm_crtc *crtc);
		extern void drm_vblank_cleanup(struct drm_device *dev);
		extern u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
		extern u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe);

		extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
		unsigned int pipe, int *max_error,
		struct timeval *vblank_time,
		unsigned flags,
		const struct drm_display_mode *mode);
		extern void drm_calc_timestamping_constants(struct drm_crtc *crtc,
		const struct drm_display_mode *mode);

		/**
		* drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
		* @crtc: which CRTC's vblank waitqueue to retrieve
		*
		* This function returns a pointer to the vblank waitqueue for the CRTC.
		* Drivers can use this to implement vblank waits using wait_event() & co.
		*/
		static inline wait_queue_head_t drm_crtc_vblank_waitqueue(struct drm_crtc crtc)
		{
		return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
		}

		/* Modesetting support */
		extern void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe);
		extern void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe);

include/drm/drm_irq.h

0 → 100644

+183 −0

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		/*
		* Copyright 2016 Intel Corp.
		*
		* Permission is hereby granted, free of charge, to any person obtaining a
		* copy of this software and associated documentation files (the "Software"),
		* to deal in the Software without restriction, including without limitation
		* the rights to use, copy, modify, merge, publish, distribute, sublicense,
		* and/or sell copies of the Software, and to permit persons to whom the
		* Software is furnished to do so, subject to the following conditions:
		*
		* The above copyright notice and this permission notice (including the next
		* paragraph) shall be included in all copies or substantial portions of the
		* Software.
		*
		* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
		* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
		* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
		* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
		* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
		* OTHER DEALINGS IN THE SOFTWARE.
		*/

		#ifndef _DRM_IRQ_H_
		#define _DRM_IRQ_H_

		#include <linux/seqlock.h>

		/**
		* struct drm_pending_vblank_event - pending vblank event tracking
		*/
		struct drm_pending_vblank_event {
		/**
		* @base: Base structure for tracking pending DRM events.
		*/
		struct drm_pending_event base;
		/**
		* @pipe: drm_crtc_index() of the &drm_crtc this event is for.
		*/
		unsigned int pipe;
		/**
		* @event: Actual event which will be sent to userspace.
		*/
		struct drm_event_vblank event;
		};

		/**
		* struct drm_vblank_crtc - vblank tracking for a CRTC
		*
		* This structure tracks the vblank state for one CRTC.
		*
		* Note that for historical reasons - the vblank handling code is still shared
		* with legacy/non-kms drivers - this is a free-standing structure not directly
		* connected to struct &drm_crtc. But all public interface functions are taking
		* a struct &drm_crtc to hide this implementation detail.
		*/
		struct drm_vblank_crtc {
		/**
		* @dev: Pointer to the &drm_device.
		*/
		struct drm_device *dev;
		/**
		* @queue: Wait queue for vblank waiters.
		*/
		wait_queue_head_t queue; /*< VBLANK wait queue /
		/**
		* @disable_timer: Disable timer for the delayed vblank disabling
		* hysteresis logic. Vblank disabling is controlled through the
		* drm_vblank_offdelay module option and the setting of the
		* max_vblank_count value in the &drm_device structure.
		*/
		struct timer_list disable_timer;

		/**
		* @seqlock: Protect vblank count and time.
		*/
		seqlock_t seqlock; /* protects vblank count and time */

		/**
		* @count: Current software vblank counter.
		*/
		u32 count;
		/**
		* @time: Vblank timestamp corresponding to @count.
		*/
		struct timeval time;

		/**
		* @refcount: Number of users/waiters of the vblank interrupt. Only when
		* this refcount reaches 0 can the hardware interrupt be disabled using
		* @disable_timer.
		*/
		atomic_t refcount; /* number of users of vblank interruptsper crtc */
		/**
		* @last: Protected by dev->vbl_lock, used for wraparound handling.
		*/
		u32 last;
		/**
		* @inmodeset: Tracks whether the vblank is disabled due to a modeset.
		* For legacy driver bit 2 additionally tracks whether an additional
		* temporary vblank reference has been acquired to paper over the
		* hardware counter resetting/jumping. KMS drivers should instead just
		* call drm_crtc_vblank_off() and drm_crtc_vblank_on(), which explicitly
		* save and restore the vblank count.
		*/
		unsigned int inmodeset; /* Display driver is setting mode */
		/**
		* @pipe: drm_crtc_index() of the &drm_crtc corresponding to this
		* structure.
		*/
		unsigned int pipe;
		/**
		* @framedur_ns: Frame/Field duration in ns, used by
		* drm_calc_vbltimestamp_from_scanoutpos() and computed by
		* drm_calc_timestamping_constants().
		*/
		int framedur_ns;
		/**
		* @linedur_ns: Line duration in ns, used by
		* drm_calc_vbltimestamp_from_scanoutpos() and computed by
		* drm_calc_timestamping_constants().
		*/
		int linedur_ns;
		/**
		* @enabled: Tracks the enabling state of the corresponding &drm_crtc to
		* avoid double-disabling and hence corrupting saved state. Needed by
		* drivers not using atomic KMS, since those might go through their CRTC
		* disabling functions multiple times.
		*/
		bool enabled;
		};

		extern int drm_irq_install(struct drm_device *dev, int irq);
		extern int drm_irq_uninstall(struct drm_device *dev);

		extern int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
		extern int drm_wait_vblank(struct drm_device dev, void data,
		struct drm_file *filp);
		extern u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe);
		extern u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
		extern u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
		struct timeval *vblanktime);
		extern void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
		struct drm_pending_vblank_event *e);
		extern void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
		struct drm_pending_vblank_event *e);
		extern bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
		extern bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
		extern int drm_crtc_vblank_get(struct drm_crtc *crtc);
		extern void drm_crtc_vblank_put(struct drm_crtc *crtc);
		extern void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
		extern void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
		extern void drm_vblank_off(struct drm_device *dev, unsigned int pipe);
		extern void drm_vblank_on(struct drm_device *dev, unsigned int pipe);
		extern void drm_crtc_vblank_off(struct drm_crtc *crtc);
		extern void drm_crtc_vblank_reset(struct drm_crtc *crtc);
		extern void drm_crtc_vblank_on(struct drm_crtc *crtc);
		extern void drm_vblank_cleanup(struct drm_device *dev);
		extern u32 drm_accurate_vblank_count(struct drm_crtc *crtc);
		extern u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe);

		extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
		unsigned int pipe, int *max_error,
		struct timeval *vblank_time,
		unsigned flags,
		const struct drm_display_mode *mode);
		extern void drm_calc_timestamping_constants(struct drm_crtc *crtc,
		const struct drm_display_mode *mode);

		/**
		* drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
		* @crtc: which CRTC's vblank waitqueue to retrieve
		*
		* This function returns a pointer to the vblank waitqueue for the CRTC.
		* Drivers can use this to implement vblank waits using wait_event() and related
		* functions.
		*/
		static inline wait_queue_head_t drm_crtc_vblank_waitqueue(struct drm_crtc crtc)
		{
		return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
		}

		#endif

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