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f1e393de38
linux_dsm_epyc7002/drivers/media/video
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Hans Verkuil f1e393de38 [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 
The driver had to decide how many events to allocate when the v4l2_fh struct
was created. It was possible to add more events afterwards, but there was no
way to ensure that you wouldn't miss important events if the event queue
would fill up for that filehandle.

In addition, once there were no more free events, any new events were simply
dropped on the floor.

For the control event in particular this made life very difficult since
control status/value changes could just be missed if the number of allocated
events and the speed at which the application read events was too low to keep
up with the number of generated events. The application would have no idea
what the latest state was for a control since it could have missed the latest
control change.

So this patch makes some major changes in how events are allocated. Instead
of allocating events per-filehandle they are now allocated when subscribing an
event. So for that particular event type N events (determined by the driver)
are allocated. Those events are reserved for that particular event type.
This ensures that you will not miss events for a particular type altogether.

In addition, if there are N events in use and a new event is raised, then
the oldest event is dropped and the new one is added. So the latest event
is always available.

This can be further improved by adding the ability to merge the state of
two events together, ensuring that no data is lost at all. This will be
added in the next patch.

This also makes it possible to allow the user to determine the number of
events that will be allocated. This is not implemented at the moment, but
would be trivial.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-07-27 17:53:31 -03:00
..
au0828 [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
bt8xx [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
cpia2 [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
cx18 [media] ivtv,cx18: Use default version control for VIDIOC_QUERYCAP 2011-07-27 17:53:14 -03:00
cx88 [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
cx231xx [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
cx23885 [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
cx25840 Fix common misspellings 2011-03-31 11:26:23 -03:00
davinci [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
em28xx [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
et61x251 [media] et61x251: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP 2011-07-27 17:53:15 -03:00
gspca [media] gspca: don't include linux/version.h 2011-07-27 17:53:15 -03:00
hdpvr [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
ivtv [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 2011-07-27 17:53:31 -03:00
m5mols [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
marvell-ccic [media] marvell-cam: implement contiguous DMA operation 2011-07-27 17:53:11 -03:00
omap [media] omap_vout: Added check in reqbuf & mmap for buf_size allocation 2011-07-01 15:47:53 -03:00
omap3isp [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 2011-07-27 17:53:31 -03:00
pvrusb2 [media] pvrusb2: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP 2011-07-27 17:53:15 -03:00
pwc [media] pwc: Use the default version for VIDIOC_QUERYCAP 2011-07-27 17:53:12 -03:00
s5p-fimc [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
saa7134 [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
saa7164 [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
sn9c102 [media] sn9c102: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP 2011-07-27 17:53:15 -03:00
tlg2300 [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
usbvision [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
uvc [media] uvcvideo: Use LINUX_VERSION_CODE for VIDIOC_QUERYCAP 2011-07-27 17:53:15 -03:00
zoran [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
adv7170.c
adv7175.c [media] adv7175: support s_power 2011-01-19 11:45:55 -02:00
adv7180.c
adv7343_regs.h [media] adv7343: use control framework 2011-03-21 20:31:49 -03:00
adv7343.c [media] adv7343: use control framework 2011-03-21 20:31:49 -03:00
ak881x.c
arv.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
atmel-isi.c [media] V4L: at91: add Atmel Image Sensor Interface (ISI) support 2011-07-27 17:53:23 -03:00
bt819.c [media] bt819: use control framework 2011-03-21 20:31:49 -03:00
bt856.c
bt866.c
btcx-risc.c
btcx-risc.h
bw-qcam.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
c-qcam.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
cs53l32a.c
cs5345.c [media] cs5345: use the control framework 2011-03-21 20:31:49 -03:00
cs8420.h
cx2341x.c [media] v4l2-ctrls: use const char * const * for the menu arrays 2010-12-30 08:02:14 -02:00
fsl-viu.c [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
hexium_gemini.c Fix common misspellings 2011-03-31 11:26:23 -03:00
hexium_orion.c [media] v4l: fix handling of v4l2_input.capabilities 2010-12-30 08:02:29 -02:00
ibmmpeg2.h
imx074.c [media] imx074: return a meaningful error code instead of -1 2011-04-13 09:54:35 -03:00
indycam.c
indycam.h
ir-kbd-i2c.c [media] ir-kbd-i2c: pass device code w/key in hauppauge case 2011-03-22 19:24:18 -03:00
Kconfig [media] V4L: at91: add Atmel Image Sensor Interface (ISI) support 2011-07-27 17:53:23 -03:00
ks0127.c
ks0127.h
m52790.c [media] v4l: make sure drivers supply a zeroed struct v4l2_subdev 2011-04-29 12:33:28 -03:00
Makefile [media] V4L: at91: add Atmel Image Sensor Interface (ISI) support 2011-07-27 17:53:23 -03:00
mem2mem_testdev.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
meye.c [media] v4l2-ioctl: add priority handling support 2011-03-22 16:37:59 -03:00
meye.h
msp3400-driver.c [media] msp3400: fill in v4l2_tuner based on vt->type field 2011-07-07 17:28:30 -03:00
msp3400-driver.h
msp3400-kthreads.c Fix common misspellings 2011-03-31 11:26:23 -03:00
mt9m001.c [media] v4l: Rename V4L2_MBUS_FMT_GREY8_1X8 to V4L2_MBUS_FMT_Y8_1X8 2011-03-22 04:53:23 -03:00
mt9m111.c [media] V4L: mt9m111: switch to v4l2-subdev .s_power() method 2011-07-27 17:53:22 -03:00
mt9t031.c [media] media: video: do not clear 'driver' from an i2c_client 2010-12-29 08:16:47 -02:00
mt9t112.c
mt9v011.c [media] mt9v011: Fixed gain calculation 2011-07-27 17:52:25 -03:00
mt9v022.c [media] V4L: mt9v022: fix pixel clock 2011-05-20 12:07:04 -03:00
mt9v032.c [media] v4l: Add mt9v032 sensor driver 2011-05-20 09:29:49 -03:00
mx1_camera.c [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
mx2_camera.c [media] V4L: mx2_camera: .try_fmt shouldn't fail 2011-07-27 17:53:22 -03:00
mx3_camera.c [media] V4L: mx3_camera: remove redundant calculations 2011-07-27 17:53:21 -03:00
mxb.c [media] v4l2-ioctl: add priority handling support 2011-03-22 16:37:59 -03:00
mxb.h
noon010pc30.c [media] Add v4l2 subdev driver for NOON010PC30L image sensor 2011-03-21 20:31:40 -03:00
omap1_camera.c [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
omap24xxcam-dma.c
omap24xxcam.c [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
omap24xxcam.h
ov772x.c [media] v4l: ov772x: simplify pointer dereference 2010-12-30 22:29:23 -02:00
ov2640.c [media] V4L2: Add a v4l2-subdev (soc-camera) driver for OmniVision OV2640 sensor 2010-12-30 22:29:34 -02:00
ov6650.c Fix common misspellings 2011-03-31 11:26:23 -03:00
ov7670.c [media] marvell-cam: Move cafe-ccic into its own directory 2011-07-27 17:53:00 -03:00
ov9640.c Fix common misspellings 2011-03-31 11:26:23 -03:00
ov9640.h
ov9740.c [media] V4L: ov9740: Add suspend/resume 2011-07-27 17:53:30 -03:00
pms.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
pxa_camera.c [media] V4L: pxa-camera: switch to using subdev .s_power() core operation 2011-07-27 17:53:21 -03:00
rj54n1cb0c.c [media] media: video: do not clear 'driver' from an i2c_client 2010-12-29 08:16:47 -02:00
s2255drv.c [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
saa711x_regs.h
saa717x.c
saa6588.c [media] saa6588: rename rds.h to saa6588.h 2010-12-29 08:17:18 -02:00
saa7110.c [media] saa7110: use control framework 2011-03-21 20:31:50 -03:00
saa7115.c [media] v4l2-ctrls: fix and improve volatile control handling 2011-07-27 17:53:17 -03:00
saa7121.h
saa7127.c
saa7146.h
saa7146reg.h
saa7185.c
saa7191.c
saa7191.h
sh_mobile_ceu_camera.c [media] V4L: sh_mobile_ceu_camera: remove redundant calculations 2011-07-27 17:53:22 -03:00
sh_mobile_csi2.c [media] sh_mobile_csi2: fix module reloading 2011-04-13 09:55:38 -03:00
sh_vou.c [media] Stop using linux/version.h on the remaining video drivers 2011-07-27 17:53:16 -03:00
soc_camera_platform.c
soc_camera.c [media] V4L: soc-camera: remove several now unused soc-camera client operations 2011-07-27 17:53:23 -03:00
soc_mediabus.c [media] V4L: soc-camera: add more format look-up entries 2011-05-20 12:05:27 -03:00
sr030pc30.c [media] Correct error code from -ENOMEM to -EINVAL. 2011-07-27 17:52:59 -03:00
stk-sensor.c
stk-webcam.c [media] stk-webcam: remove V4L1 compatibility code, replace with V4L2 controls 2010-12-29 08:17:09 -02:00
stk-webcam.h
tcm825x.c Fix common misspellings 2011-03-31 11:26:23 -03:00
tcm825x.h
tda7432.c [media] Correct and add some parameter descriptions 2011-07-27 17:52:59 -03:00
tda9840.c [media] v4l: make sure drivers supply a zeroed struct v4l2_subdev 2011-04-29 12:33:28 -03:00
tea6415c.c [media] v4l: make sure drivers supply a zeroed struct v4l2_subdev 2011-04-29 12:33:28 -03:00
tea6415c.h
tea6420.c [media] v4l: make sure drivers supply a zeroed struct v4l2_subdev 2011-04-29 12:33:28 -03:00
tea6420.h
ths7303.c
timblogiw.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
tlv320aic23b.c [media] tlv320aic23b: use control framework 2011-03-21 20:31:50 -03:00
tuner-core.c [media] xc4000: removed card_type 2011-07-27 17:52:40 -03:00
tvaudio.c Fix common misspellings 2011-03-31 11:26:23 -03:00
tveeprom.c [media] tveeprom: update hauppauge tuner list thru 174 2011-05-20 09:27:15 -03:00
tvp514x_regs.h
tvp514x.c [media] tvp514x: use the control framework 2011-03-21 20:31:50 -03:00
tvp5150_reg.h
tvp5150.c [media] tvp5150: device detection should be done only once 2011-03-21 20:32:04 -03:00
tvp7002_reg.h
tvp7002.c [media] tvp7002: use control framework 2011-03-21 20:31:50 -03:00
tw9910.c [media] V4L: tw9910: remove bogus ENUMINPUT implementation 2011-07-27 17:53:22 -03:00
upd64031a.c [media] v4l: make sure drivers supply a zeroed struct v4l2_subdev 2011-04-29 12:33:28 -03:00
upd64083.c [media] v4l: make sure drivers supply a zeroed struct v4l2_subdev 2011-04-29 12:33:28 -03:00
v4l2-common.c [media] v4l2_prio: move from v4l2-common to v4l2-dev 2011-03-22 16:37:54 -03:00
v4l2-compat-ioctl32.c [media] v4l2-compat-ioctl32: add VIDIOC_DQEVENT support 2011-07-27 17:53:20 -03:00
v4l2-ctrls.c [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 2011-07-27 17:53:31 -03:00
v4l2-dev.c [media] v4l: Don't access media entity after is has been destroyed 2011-06-30 23:12:36 -03:00
v4l2-device.c [media] v4l2-subdev: implement per-filehandle control handlers 2011-07-27 17:53:17 -03:00
v4l2-event.c [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 2011-07-27 17:53:31 -03:00
v4l2-fh.c [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 2011-07-27 17:53:31 -03:00
v4l2-int-device.c
v4l2-ioctl.c [media] v4l2-ctrls: add v4l2_fh pointer to the set control functions 2011-07-27 17:53:19 -03:00
v4l2-mem2mem.c [media] Update Pawel Osciak's e-mail address 2011-03-22 04:55:05 -03:00
v4l2-subdev.c [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 2011-07-27 17:53:31 -03:00
via-camera.c [media] via-camera: add MODULE_ALIAS 2011-05-20 09:30:49 -03:00
via-camera.h [media] Add the via framebuffer camera controller driver 2010-10-21 13:45:28 -02:00
videobuf2-core.c [media] media: vb2: fix allocation failure check 2011-06-30 22:33:47 -03:00
videobuf2-dma-contig.c [media] videobuf2: fix an error message 2011-04-13 09:52:36 -03:00
videobuf2-dma-sg.c [media] media: Convert vmalloc/memset to vzalloc 2011-07-27 17:52:21 -03:00
videobuf2-memops.c [media] V4L/videobuf2-memops: use pr_debug for debug messages 2011-07-27 17:52:23 -03:00
videobuf2-vmalloc.c [media] Update Pawel Osciak's e-mail address 2011-03-22 04:55:05 -03:00
videobuf-core.c [media] V4L: remove V4L1 compatibility mode 2010-12-29 08:17:07 -02:00
videobuf-dma-contig.c Revert "[media] V4L: videobuf, don't use dma addr as physical" 2011-04-19 10:54:44 -07:00
videobuf-dma-sg.c [media] videobuf_pages_to_sg: sglist[0] length problem 2011-07-27 17:52:19 -03:00
videobuf-dvb.c
videobuf-vmalloc.c
vino.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
vino.h
vivi.c [media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh 2011-07-27 17:53:31 -03:00
vp27smpx.c
vpx3220.c Fix common misspellings 2011-03-31 11:26:23 -03:00
w9966.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00
wm8739.c
wm8775.c [media] Add proper audio support for Nova-S Plus with wm8775 ADC 2011-03-21 20:32:19 -03:00
zr364xx.c [media] Stop using linux/version.h on most video drivers 2011-07-27 17:53:12 -03:00