671 lines
20 KiB
C
671 lines
20 KiB
C
/*
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* drm_irq.c IRQ and vblank support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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//#include "drm_trace.h"
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#include "drm_internal.h"
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//#include <linux/interrupt.h> /* For task queue support */
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#include <linux/slab.h>
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#include <linux/vgaarb.h>
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#include <linux/export.h>
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/* Access macro for slots in vblank timestamp ringbuffer. */
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#define vblanktimestamp(dev, crtc, count) \
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((dev)->vblank[crtc].time[(count) % DRM_VBLANKTIME_RBSIZE])
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/* Retry timestamp calculation up to 3 times to satisfy
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* drm_timestamp_precision before giving up.
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*/
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#define DRM_TIMESTAMP_MAXRETRIES 3
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/* Threshold in nanoseconds for detection of redundant
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* vblank irq in drm_handle_vblank(). 1 msec should be ok.
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*/
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#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
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static bool
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drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
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struct timeval *tvblank, unsigned flags);
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static unsigned int drm_timestamp_precision = 20; /* Default to 20 usecs. */
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/*
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* Clear vblank timestamp buffer for a crtc.
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*/
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#if 0
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/**
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* drm_vblank_init - initialize vblank support
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* @dev: drm_device
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* @num_crtcs: number of crtcs supported by @dev
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*
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* This function initializes vblank support for @num_crtcs display pipelines.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_vblank_init(struct drm_device *dev, int num_crtcs)
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{
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int i, ret = -ENOMEM;
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spin_lock_init(&dev->vbl_lock);
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spin_lock_init(&dev->vblank_time_lock);
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dev->num_crtcs = num_crtcs;
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dev->vblank = kcalloc(num_crtcs, sizeof(*dev->vblank), GFP_KERNEL);
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if (!dev->vblank)
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goto err;
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for (i = 0; i < num_crtcs; i++) {
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struct drm_vblank_crtc *vblank = &dev->vblank[i];
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vblank->dev = dev;
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vblank->crtc = i;
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init_waitqueue_head(&vblank->queue);
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setup_timer(&vblank->disable_timer, vblank_disable_fn,
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(unsigned long)vblank);
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}
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DRM_INFO("Supports vblank timestamp caching Rev 2 (21.10.2013).\n");
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/* Driver specific high-precision vblank timestamping supported? */
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if (dev->driver->get_vblank_timestamp)
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DRM_INFO("Driver supports precise vblank timestamp query.\n");
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else
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DRM_INFO("No driver support for vblank timestamp query.\n");
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dev->vblank_disable_allowed = false;
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return 0;
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err:
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dev->num_crtcs = 0;
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return ret;
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}
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EXPORT_SYMBOL(drm_vblank_init);
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#endif
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irqreturn_t device_irq_handler(struct drm_device *dev)
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{
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// printf("video irq\n");
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// printf("device %p driver %p handler %p\n", dev, dev->driver, dev->driver->irq_handler) ;
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return dev->driver->irq_handler(0, dev);
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}
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/**
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* drm_irq_install - install IRQ handler
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* @dev: DRM device
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* @irq: IRQ number to install the handler for
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*
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* Initializes the IRQ related data. Installs the handler, calling the driver
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* irq_preinstall() and irq_postinstall() functions before and after the
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* installation.
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*
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* This is the simplified helper interface provided for drivers with no special
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* needs. Drivers which need to install interrupt handlers for multiple
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* interrupts must instead set drm_device->irq_enabled to signal the DRM core
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* that vblank interrupts are available.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_irq_install(struct drm_device *dev, int irq)
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{
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int ret;
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unsigned long sh_flags = 0;
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EINVAL;
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if (irq == 0)
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return -EINVAL;
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/* Driver must have been initialized */
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if (!dev->dev_private)
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return -EINVAL;
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if (dev->irq_enabled)
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return -EBUSY;
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dev->irq_enabled = true;
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DRM_DEBUG("irq=%d\n", irq);
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/* Before installing handler */
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if (dev->driver->irq_preinstall)
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dev->driver->irq_preinstall(dev);
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ret = !AttachIntHandler(irq, device_irq_handler, (u32)dev);
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/* After installing handler */
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if (dev->driver->irq_postinstall)
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ret = dev->driver->irq_postinstall(dev);
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if (ret < 0) {
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dev->irq_enabled = false;
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DRM_ERROR(__FUNCTION__);
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} else {
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dev->irq = irq;
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}
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u16 cmd = PciRead16(dev->pdev->busnr, dev->pdev->devfn, 4);
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cmd&= ~(1<<10);
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PciWrite16(dev->pdev->busnr, dev->pdev->devfn, 4, cmd);
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return ret;
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}
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EXPORT_SYMBOL(drm_irq_install);
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u64 div64_u64(u64 dividend, u64 divisor)
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{
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u32 high, d;
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high = divisor >> 32;
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if (high) {
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unsigned int shift = fls(high);
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d = divisor >> shift;
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dividend >>= shift;
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} else
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d = divisor;
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return div_u64(dividend, d);
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}
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/**
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* drm_calc_timestamping_constants - calculate vblank timestamp constants
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* @crtc: drm_crtc whose timestamp constants should be updated.
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* @mode: display mode containing the scanout timings
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*
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* Calculate and store various constants which are later
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* needed by vblank and swap-completion timestamping, e.g,
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* by drm_calc_vbltimestamp_from_scanoutpos(). They are
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* derived from CRTC's true scanout timing, so they take
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* things like panel scaling or other adjustments into account.
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*/
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void drm_calc_timestamping_constants(struct drm_crtc *crtc,
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const struct drm_display_mode *mode)
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{
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int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;
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int dotclock = mode->crtc_clock;
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/* Valid dotclock? */
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if (dotclock > 0) {
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int frame_size = mode->crtc_htotal * mode->crtc_vtotal;
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/*
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* Convert scanline length in pixels and video
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* dot clock to line duration, frame duration
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* and pixel duration in nanoseconds:
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*/
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pixeldur_ns = 1000000 / dotclock;
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linedur_ns = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);
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framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);
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/*
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* Fields of interlaced scanout modes are only half a frame duration.
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*/
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if (mode->flags & DRM_MODE_FLAG_INTERLACE)
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framedur_ns /= 2;
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} else
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DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",
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crtc->base.id);
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crtc->pixeldur_ns = pixeldur_ns;
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crtc->linedur_ns = linedur_ns;
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crtc->framedur_ns = framedur_ns;
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DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",
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crtc->base.id, mode->crtc_htotal,
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mode->crtc_vtotal, mode->crtc_vdisplay);
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DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",
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crtc->base.id, dotclock, framedur_ns,
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linedur_ns, pixeldur_ns);
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}
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EXPORT_SYMBOL(drm_calc_timestamping_constants);
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/**
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* drm_calc_vbltimestamp_from_scanoutpos - precise vblank timestamp helper
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* @dev: DRM device
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* @crtc: Which CRTC's vblank timestamp to retrieve
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* @max_error: Desired maximum allowable error in timestamps (nanosecs)
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* On return contains true maximum error of timestamp
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* @vblank_time: Pointer to struct timeval which should receive the timestamp
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* @flags: Flags to pass to driver:
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* 0 = Default,
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* DRM_CALLED_FROM_VBLIRQ = If function is called from vbl IRQ handler
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* @refcrtc: CRTC which defines scanout timing
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* @mode: mode which defines the scanout timings
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*
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* Implements calculation of exact vblank timestamps from given drm_display_mode
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* timings and current video scanout position of a CRTC. This can be called from
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* within get_vblank_timestamp() implementation of a kms driver to implement the
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* actual timestamping.
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*
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* Should return timestamps conforming to the OML_sync_control OpenML
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* extension specification. The timestamp corresponds to the end of
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* the vblank interval, aka start of scanout of topmost-leftmost display
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* pixel in the following video frame.
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*
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* Requires support for optional dev->driver->get_scanout_position()
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* in kms driver, plus a bit of setup code to provide a drm_display_mode
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* that corresponds to the true scanout timing.
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*
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* The current implementation only handles standard video modes. It
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* returns as no operation if a doublescan or interlaced video mode is
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* active. Higher level code is expected to handle this.
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*
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* Returns:
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* Negative value on error, failure or if not supported in current
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* video mode:
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*
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* -EINVAL - Invalid CRTC.
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* -EAGAIN - Temporary unavailable, e.g., called before initial modeset.
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* -ENOTSUPP - Function not supported in current display mode.
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* -EIO - Failed, e.g., due to failed scanout position query.
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*
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* Returns or'ed positive status flags on success:
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*
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* DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.
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* DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.
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*
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*/
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int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
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int *max_error,
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struct timeval *vblank_time,
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unsigned flags,
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const struct drm_crtc *refcrtc,
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const struct drm_display_mode *mode)
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{
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struct timeval tv_etime;
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int vbl_status;
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int vpos, hpos, i;
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int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;
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bool invbl;
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if (crtc < 0 || crtc >= dev->num_crtcs) {
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DRM_ERROR("Invalid crtc %d\n", crtc);
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return -EINVAL;
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}
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/* Scanout position query not supported? Should not happen. */
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if (!dev->driver->get_scanout_position) {
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DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");
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return -EIO;
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}
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/* Durations of frames, lines, pixels in nanoseconds. */
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framedur_ns = refcrtc->framedur_ns;
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linedur_ns = refcrtc->linedur_ns;
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pixeldur_ns = refcrtc->pixeldur_ns;
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/* If mode timing undefined, just return as no-op:
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* Happens during initial modesetting of a crtc.
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*/
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if (framedur_ns == 0) {
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DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc);
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return -EAGAIN;
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}
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return -EIO;
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}
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EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);
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/**
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* drm_vblank_get - get a reference count on vblank events
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* @dev: DRM device
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* @crtc: which CRTC to own
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*
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* Acquire a reference count on vblank events to avoid having them disabled
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* while in use.
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*
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* This is the legacy version of drm_crtc_vblank_get().
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*
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* Returns:
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* Zero on success, nonzero on failure.
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*/
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int drm_vblank_get(struct drm_device *dev, int crtc)
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{
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struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
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unsigned long irqflags;
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int ret = 0;
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#if 0
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if (WARN_ON(crtc >= dev->num_crtcs))
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return -EINVAL;
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spin_lock_irqsave(&dev->vbl_lock, irqflags);
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/* Going from 0->1 means we have to enable interrupts again */
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if (atomic_add_return(1, &vblank->refcount) == 1) {
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ret = drm_vblank_enable(dev, crtc);
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} else {
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if (!vblank->enabled) {
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atomic_dec(&vblank->refcount);
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ret = -EINVAL;
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}
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}
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
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#endif
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return ret;
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}
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EXPORT_SYMBOL(drm_vblank_get);
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/**
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* drm_crtc_vblank_get - get a reference count on vblank events
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* @crtc: which CRTC to own
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*
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* Acquire a reference count on vblank events to avoid having them disabled
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* while in use.
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*
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* This is the native kms version of drm_vblank_off().
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*
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* Returns:
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* Zero on success, nonzero on failure.
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*/
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int drm_crtc_vblank_get(struct drm_crtc *crtc)
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{
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return drm_vblank_get(crtc->dev, drm_crtc_index(crtc));
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}
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EXPORT_SYMBOL(drm_crtc_vblank_get);
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/**
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* drm_vblank_put - give up ownership of vblank events
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* @dev: DRM device
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* @crtc: which counter to give up
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*
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* Release ownership of a given vblank counter, turning off interrupts
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* if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
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*
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* This is the legacy version of drm_crtc_vblank_put().
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*/
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void drm_vblank_put(struct drm_device *dev, int crtc)
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{
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#if 0
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struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
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if (WARN_ON(atomic_read(&vblank->refcount) == 0))
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return;
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if (WARN_ON(crtc >= dev->num_crtcs))
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return;
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/* Last user schedules interrupt disable */
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if (atomic_dec_and_test(&vblank->refcount)) {
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if (drm_vblank_offdelay == 0)
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return;
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else if (dev->vblank_disable_immediate || drm_vblank_offdelay < 0)
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vblank_disable_fn((unsigned long)vblank);
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else
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mod_timer(&vblank->disable_timer,
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jiffies + ((drm_vblank_offdelay * HZ)/1000));
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}
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#endif
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}
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EXPORT_SYMBOL(drm_vblank_put);
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/**
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* drm_crtc_vblank_put - give up ownership of vblank events
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* @crtc: which counter to give up
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*
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* Release ownership of a given vblank counter, turning off interrupts
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* if possible. Disable interrupts after drm_vblank_offdelay milliseconds.
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*
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* This is the native kms version of drm_vblank_put().
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*/
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void drm_crtc_vblank_put(struct drm_crtc *crtc)
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{
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drm_vblank_put(crtc->dev, drm_crtc_index(crtc));
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}
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EXPORT_SYMBOL(drm_crtc_vblank_put);
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/**
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* drm_wait_one_vblank - wait for one vblank
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* @dev: DRM device
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* @crtc: crtc index
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*
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* This waits for one vblank to pass on @crtc, using the irq driver interfaces.
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* It is a failure to call this when the vblank irq for @crtc is disabled, e.g.
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* due to lack of driver support or because the crtc is off.
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*/
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void drm_wait_one_vblank(struct drm_device *dev, int crtc)
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{
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#if 0
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int ret;
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u32 last;
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ret = drm_vblank_get(dev, crtc);
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if (WARN(ret, "vblank not available on crtc %i, ret=%i\n", crtc, ret))
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return;
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last = drm_vblank_count(dev, crtc);
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ret = wait_event_timeout(dev->vblank[crtc].queue,
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last != drm_vblank_count(dev, crtc),
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msecs_to_jiffies(100));
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WARN(ret == 0, "vblank wait timed out on crtc %i\n", crtc);
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drm_vblank_put(dev, crtc);
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#endif
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}
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EXPORT_SYMBOL(drm_wait_one_vblank);
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/**
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* drm_crtc_wait_one_vblank - wait for one vblank
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* @crtc: DRM crtc
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*
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* This waits for one vblank to pass on @crtc, using the irq driver interfaces.
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* It is a failure to call this when the vblank irq for @crtc is disabled, e.g.
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* due to lack of driver support or because the crtc is off.
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*/
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void drm_crtc_wait_one_vblank(struct drm_crtc *crtc)
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{
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drm_wait_one_vblank(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_wait_one_vblank);
|
|
|
|
/**
|
|
* drm_vblank_off - disable vblank events on a CRTC
|
|
* @dev: DRM device
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Drivers can use this function to shut down the vblank interrupt handling when
|
|
* disabling a crtc. This function ensures that the latest vblank frame count is
|
|
* stored so that drm_vblank_on() can restore it again.
|
|
*
|
|
* Drivers must use this function when the hardware vblank counter can get
|
|
* reset, e.g. when suspending.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_off().
|
|
*/
|
|
void drm_vblank_off(struct drm_device *dev, int crtc)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
|
|
struct drm_pending_vblank_event *e, *t;
|
|
struct timeval now;
|
|
unsigned long irqflags;
|
|
unsigned int seq;
|
|
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_off);
|
|
|
|
/**
|
|
* drm_crtc_vblank_off - disable vblank events on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Drivers can use this function to shut down the vblank interrupt handling when
|
|
* disabling a crtc. This function ensures that the latest vblank frame count is
|
|
* stored so that drm_vblank_on can restore it again.
|
|
*
|
|
* Drivers must use this function when the hardware vblank counter can get
|
|
* reset, e.g. when suspending.
|
|
*
|
|
* This is the native kms version of drm_vblank_off().
|
|
*/
|
|
void drm_crtc_vblank_off(struct drm_crtc *crtc)
|
|
{
|
|
drm_vblank_off(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_off);
|
|
|
|
/**
|
|
* drm_vblank_on - enable vblank events on a CRTC
|
|
* @dev: DRM device
|
|
* @crtc: CRTC in question
|
|
*
|
|
* This functions restores the vblank interrupt state captured with
|
|
* drm_vblank_off() again. Note that calls to drm_vblank_on() and
|
|
* drm_vblank_off() can be unbalanced and so can also be unconditionally called
|
|
* in driver load code to reflect the current hardware state of the crtc.
|
|
*
|
|
* This is the legacy version of drm_crtc_vblank_on().
|
|
*/
|
|
void drm_vblank_on(struct drm_device *dev, int crtc)
|
|
{
|
|
struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
|
|
unsigned long irqflags;
|
|
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_on);
|
|
|
|
/**
|
|
* drm_crtc_vblank_on - enable vblank events on a CRTC
|
|
* @crtc: CRTC in question
|
|
*
|
|
* This functions restores the vblank interrupt state captured with
|
|
* drm_vblank_off() again. Note that calls to drm_vblank_on() and
|
|
* drm_vblank_off() can be unbalanced and so can also be unconditionally called
|
|
* in driver load code to reflect the current hardware state of the crtc.
|
|
*
|
|
* This is the native kms version of drm_vblank_on().
|
|
*/
|
|
void drm_crtc_vblank_on(struct drm_crtc *crtc)
|
|
{
|
|
drm_vblank_on(crtc->dev, drm_crtc_index(crtc));
|
|
}
|
|
EXPORT_SYMBOL(drm_crtc_vblank_on);
|
|
|
|
/**
|
|
* drm_vblank_pre_modeset - account for vblanks across mode sets
|
|
* @dev: DRM device
|
|
* @crtc: CRTC in question
|
|
*
|
|
* Account for vblank events across mode setting events, which will likely
|
|
* reset the hardware frame counter.
|
|
*
|
|
* This is done by grabbing a temporary vblank reference to ensure that the
|
|
* vblank interrupt keeps running across the modeset sequence. With this the
|
|
* software-side vblank frame counting will ensure that there are no jumps or
|
|
* discontinuities.
|
|
*
|
|
* Unfortunately this approach is racy and also doesn't work when the vblank
|
|
* interrupt stops running, e.g. across system suspend resume. It is therefore
|
|
* highly recommended that drivers use the newer drm_vblank_off() and
|
|
* drm_vblank_on() instead. drm_vblank_pre_modeset() only works correctly when
|
|
* using "cooked" software vblank frame counters and not relying on any hardware
|
|
* counters.
|
|
*
|
|
* Drivers must call drm_vblank_post_modeset() when re-enabling the same crtc
|
|
* again.
|
|
*/
|
|
void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)
|
|
{
|
|
#if 0
|
|
/* vblank is not initialized (IRQ not installed ?) */
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (WARN_ON(crtc >= dev->num_crtcs))
|
|
return;
|
|
|
|
/*
|
|
* To avoid all the problems that might happen if interrupts
|
|
* were enabled/disabled around or between these calls, we just
|
|
* have the kernel take a reference on the CRTC (just once though
|
|
* to avoid corrupting the count if multiple, mismatch calls occur),
|
|
* so that interrupts remain enabled in the interim.
|
|
*/
|
|
if (!vblank->inmodeset) {
|
|
vblank->inmodeset = 0x1;
|
|
if (drm_vblank_get(dev, crtc) == 0)
|
|
vblank->inmodeset |= 0x2;
|
|
}
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_pre_modeset);
|
|
|
|
/**
|
|
* drm_vblank_post_modeset - undo drm_vblank_pre_modeset changes
|
|
* @dev: DRM device
|
|
* @crtc: CRTC in question
|
|
*
|
|
* This function again drops the temporary vblank reference acquired in
|
|
* drm_vblank_pre_modeset.
|
|
*/
|
|
void drm_vblank_post_modeset(struct drm_device *dev, int crtc)
|
|
{
|
|
#if 0
|
|
unsigned long irqflags;
|
|
|
|
/* vblank is not initialized (IRQ not installed ?), or has been freed */
|
|
if (!dev->num_crtcs)
|
|
return;
|
|
|
|
if (vblank->inmodeset) {
|
|
spin_lock_irqsave(&dev->vbl_lock, irqflags);
|
|
dev->vblank_disable_allowed = true;
|
|
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
|
|
|
|
if (vblank->inmodeset & 0x2)
|
|
drm_vblank_put(dev, crtc);
|
|
|
|
vblank->inmodeset = 0;
|
|
}
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(drm_vblank_post_modeset);
|
|
|
|
|