xenocara/xserver/hw/xfree86/drivers/modesetting/vblank.c

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/*
* Copyright © 2013 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
/** @file vblank.c
*
* Support for tracking the DRM's vblank events.
*/
#ifdef HAVE_DIX_CONFIG_H
#include "dix-config.h"
#endif
#include <unistd.h>
#include <xf86.h>
#include <xf86Crtc.h>
#include <poll.h>
#include "driver.h"
#include "drmmode_display.h"
/**
* Tracking for outstanding events queued to the kernel.
*
* Each list entry is a struct ms_drm_queue, which has a uint32_t
* value generated from drm_seq that identifies the event and a
* reference back to the crtc/screen associated with the event. It's
* done this way rather than in the screen because we want to be able
* to drain the list of event handlers that should be called at server
* regen time, even though we don't close the drm fd and have no way
* to actually drain the kernel events.
*/
static struct xorg_list ms_drm_queue;
static uint32_t ms_drm_seq;
static void ms_box_intersect(BoxPtr dest, BoxPtr a, BoxPtr b)
{
dest->x1 = a->x1 > b->x1 ? a->x1 : b->x1;
dest->x2 = a->x2 < b->x2 ? a->x2 : b->x2;
if (dest->x1 >= dest->x2) {
dest->x1 = dest->x2 = dest->y1 = dest->y2 = 0;
return;
}
dest->y1 = a->y1 > b->y1 ? a->y1 : b->y1;
dest->y2 = a->y2 < b->y2 ? a->y2 : b->y2;
if (dest->y1 >= dest->y2)
dest->x1 = dest->x2 = dest->y1 = dest->y2 = 0;
}
static void ms_crtc_box(xf86CrtcPtr crtc, BoxPtr crtc_box)
{
if (crtc->enabled) {
crtc_box->x1 = crtc->x;
crtc_box->x2 =
crtc->x + xf86ModeWidth(&crtc->mode, crtc->rotation);
crtc_box->y1 = crtc->y;
crtc_box->y2 =
crtc->y + xf86ModeHeight(&crtc->mode, crtc->rotation);
} else
crtc_box->x1 = crtc_box->x2 = crtc_box->y1 = crtc_box->y2 = 0;
}
static int ms_box_area(BoxPtr box)
{
return (int)(box->x2 - box->x1) * (int)(box->y2 - box->y1);
}
Bool
ms_crtc_on(xf86CrtcPtr crtc)
{
drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
return crtc->enabled && drmmode_crtc->dpms_mode == DPMSModeOn;
}
/*
* Return the crtc covering 'box'. If two crtcs cover a portion of
* 'box', then prefer 'desired'. If 'desired' is NULL, then prefer the crtc
* with greater coverage
*/
xf86CrtcPtr
ms_covering_crtc(ScrnInfoPtr scrn,
BoxPtr box, xf86CrtcPtr desired, BoxPtr crtc_box_ret)
{
xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
xf86CrtcPtr crtc, best_crtc;
int coverage, best_coverage;
int c;
BoxRec crtc_box, cover_box;
best_crtc = NULL;
best_coverage = 0;
crtc_box_ret->x1 = 0;
crtc_box_ret->x2 = 0;
crtc_box_ret->y1 = 0;
crtc_box_ret->y2 = 0;
for (c = 0; c < xf86_config->num_crtc; c++) {
crtc = xf86_config->crtc[c];
/* If the CRTC is off, treat it as not covering */
if (!ms_crtc_on(crtc))
continue;
ms_crtc_box(crtc, &crtc_box);
ms_box_intersect(&cover_box, &crtc_box, box);
coverage = ms_box_area(&cover_box);
if (coverage && crtc == desired) {
*crtc_box_ret = crtc_box;
return crtc;
}
if (coverage > best_coverage) {
*crtc_box_ret = crtc_box;
best_crtc = crtc;
best_coverage = coverage;
}
}
return best_crtc;
}
xf86CrtcPtr
ms_dri2_crtc_covering_drawable(DrawablePtr pDraw)
{
ScreenPtr pScreen = pDraw->pScreen;
ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
BoxRec box, crtcbox;
box.x1 = pDraw->x;
box.y1 = pDraw->y;
box.x2 = box.x1 + pDraw->width;
box.y2 = box.y1 + pDraw->height;
return ms_covering_crtc(pScrn, &box, NULL, &crtcbox);
}
static Bool
ms_get_kernel_ust_msc(xf86CrtcPtr crtc,
uint32_t *msc, uint64_t *ust)
{
ScreenPtr screen = crtc->randr_crtc->pScreen;
ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
modesettingPtr ms = modesettingPTR(scrn);
drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
drmVBlank vbl;
int ret;
/* Get current count */
vbl.request.type = DRM_VBLANK_RELATIVE | drmmode_crtc->vblank_pipe;
vbl.request.sequence = 0;
vbl.request.signal = 0;
ret = drmWaitVBlank(ms->fd, &vbl);
if (ret) {
*msc = 0;
*ust = 0;
return FALSE;
} else {
*msc = vbl.reply.sequence;
*ust = (CARD64) vbl.reply.tval_sec * 1000000 + vbl.reply.tval_usec;
return TRUE;
}
}
/**
* Convert a 32-bit kernel MSC sequence number to a 64-bit local sequence
* number, adding in the vblank_offset and high 32 bits, and dealing
* with 64-bit wrapping
*/
uint64_t
ms_kernel_msc_to_crtc_msc(xf86CrtcPtr crtc, uint32_t sequence)
{
drmmode_crtc_private_rec *drmmode_crtc = crtc->driver_private;
sequence += drmmode_crtc->vblank_offset;
if ((int32_t) (sequence - drmmode_crtc->msc_prev) < -0x40000000)
drmmode_crtc->msc_high += 0x100000000L;
drmmode_crtc->msc_prev = sequence;
return drmmode_crtc->msc_high + sequence;
}
int
ms_get_crtc_ust_msc(xf86CrtcPtr crtc, CARD64 *ust, CARD64 *msc)
{
uint32_t kernel_msc;
if (!ms_get_kernel_ust_msc(crtc, &kernel_msc, ust))
return BadMatch;
*msc = ms_kernel_msc_to_crtc_msc(crtc, kernel_msc);
return Success;
}
#define MAX_VBLANK_OFFSET 1000
/**
* Convert a 64-bit adjusted MSC value into a 32-bit kernel sequence number,
* removing the high 32 bits and subtracting out the vblank_offset term.
*
* This also updates the vblank_offset when it notices that the value should
* change.
*/
uint32_t
ms_crtc_msc_to_kernel_msc(xf86CrtcPtr crtc, uint64_t expect)
{
drmmode_crtc_private_rec *drmmode_crtc = crtc->driver_private;
uint64_t msc;
uint64_t ust;
int64_t diff;
if (ms_get_crtc_ust_msc(crtc, &ust, &msc) == Success) {
diff = expect - msc;
/* We're way off here, assume that the kernel has lost its mind
* and smack the vblank back to something sensible
*/
if (diff < -MAX_VBLANK_OFFSET || MAX_VBLANK_OFFSET < diff) {
drmmode_crtc->vblank_offset += (int32_t) diff;
if (drmmode_crtc->vblank_offset > -MAX_VBLANK_OFFSET &&
drmmode_crtc->vblank_offset < MAX_VBLANK_OFFSET)
drmmode_crtc->vblank_offset = 0;
}
}
return (uint32_t) (expect - drmmode_crtc->vblank_offset);
}
/**
* Check for pending DRM events and process them.
*/
static void
ms_drm_wakeup_handler(void *data, int err, void *mask)
{
ScreenPtr screen = data;
ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
modesettingPtr ms = modesettingPTR(scrn);
fd_set *read_mask = mask;
if (data == NULL || err < 0)
return;
if (FD_ISSET(ms->fd, read_mask))
drmHandleEvent(ms->fd, &ms->event_context);
}
/*
* Enqueue a potential drm response; when the associated response
* appears, we've got data to pass to the handler from here
*/
uint32_t
ms_drm_queue_alloc(xf86CrtcPtr crtc,
void *data,
ms_drm_handler_proc handler,
ms_drm_abort_proc abort)
{
ScreenPtr screen = crtc->randr_crtc->pScreen;
ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
struct ms_drm_queue *q;
q = calloc(1, sizeof(struct ms_drm_queue));
if (!q)
return 0;
if (!ms_drm_seq)
++ms_drm_seq;
q->seq = ms_drm_seq++;
q->scrn = scrn;
q->crtc = crtc;
q->data = data;
q->handler = handler;
q->abort = abort;
xorg_list_add(&q->list, &ms_drm_queue);
return q->seq;
}
/**
* Abort one queued DRM entry, removing it
* from the list, calling the abort function and
* freeing the memory
*/
static void
ms_drm_abort_one(struct ms_drm_queue *q)
{
xorg_list_del(&q->list);
q->abort(q->data);
free(q);
}
/**
* Abort all queued entries on a specific scrn, used
* when resetting the X server
*/
static void
ms_drm_abort_scrn(ScrnInfoPtr scrn)
{
struct ms_drm_queue *q, *tmp;
xorg_list_for_each_entry_safe(q, tmp, &ms_drm_queue, list) {
if (q->scrn == scrn)
ms_drm_abort_one(q);
}
}
/**
* Abort by drm queue sequence number.
*/
void
ms_drm_abort_seq(ScrnInfoPtr scrn, uint32_t seq)
{
struct ms_drm_queue *q, *tmp;
xorg_list_for_each_entry_safe(q, tmp, &ms_drm_queue, list) {
if (q->seq == seq) {
ms_drm_abort_one(q);
break;
}
}
}
/*
* Externally usable abort function that uses a callback to match a single
* queued entry to abort
*/
void
ms_drm_abort(ScrnInfoPtr scrn, Bool (*match)(void *data, void *match_data),
void *match_data)
{
struct ms_drm_queue *q;
xorg_list_for_each_entry(q, &ms_drm_queue, list) {
if (match(q->data, match_data)) {
ms_drm_abort_one(q);
break;
}
}
}
/*
* General DRM kernel handler. Looks for the matching sequence number in the
* drm event queue and calls the handler for it.
*/
static void
ms_drm_handler(int fd, uint32_t frame, uint32_t sec, uint32_t usec,
void *user_ptr)
{
struct ms_drm_queue *q, *tmp;
uint32_t user_data = (uint32_t) (intptr_t) user_ptr;
xorg_list_for_each_entry_safe(q, tmp, &ms_drm_queue, list) {
if (q->seq == user_data) {
uint64_t msc;
msc = ms_kernel_msc_to_crtc_msc(q->crtc, frame);
xorg_list_del(&q->list);
q->handler(msc, (uint64_t) sec * 1000000 + usec, q->data);
free(q);
break;
}
}
}
Bool
ms_vblank_screen_init(ScreenPtr screen)
{
ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
modesettingPtr ms = modesettingPTR(scrn);
modesettingEntPtr ms_ent = ms_ent_priv(scrn);
xorg_list_init(&ms_drm_queue);
ms->event_context.version = DRM_EVENT_CONTEXT_VERSION;
ms->event_context.vblank_handler = ms_drm_handler;
ms->event_context.page_flip_handler = ms_drm_handler;
/* We need to re-register the DRM fd for the synchronisation
* feedback on every server generation, so perform the
* registration within ScreenInit and not PreInit.
*/
if (ms_ent->fd_wakeup_registered != serverGeneration) {
AddGeneralSocket(ms->fd);
RegisterBlockAndWakeupHandlers((BlockHandlerProcPtr)NoopDDA,
ms_drm_wakeup_handler, screen);
ms_ent->fd_wakeup_registered = serverGeneration;
ms_ent->fd_wakeup_ref = 1;
} else
ms_ent->fd_wakeup_ref++;
return TRUE;
}
void
ms_vblank_close_screen(ScreenPtr screen)
{
ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
modesettingPtr ms = modesettingPTR(scrn);
modesettingEntPtr ms_ent = ms_ent_priv(scrn);
ms_drm_abort_scrn(scrn);
if (ms_ent->fd_wakeup_registered == serverGeneration &&
!--ms_ent->fd_wakeup_ref) {
RemoveBlockAndWakeupHandlers((BlockHandlerProcPtr)NoopDDA,
ms_drm_wakeup_handler, screen);
RemoveGeneralSocket(ms->fd);
}
}