| Message ID | 20230710130113.14563-1-tzimmermann@suse.de |
|---|---|
| Headers | show |
| Series | fbdev: Remove FBINFO_DEFAULT and FBINFO_FLAG_DEFAULT flags | expand |
Hi Helge, On Tue, Jul 11, 2023 at 5:26 PM Helge Deller <deller@gmx.de> wrote: > On 7/11/23 16:47, Sam Ravnborg wrote: > > On Tue, Jul 11, 2023 at 08:24:40AM +0200, Thomas Zimmermann wrote: > >> Am 10.07.23 um 19:19 schrieb Sam Ravnborg: > >>> On Mon, Jul 10, 2023 at 02:50:04PM +0200, Thomas Zimmermann wrote: > >>>> Remove the unused flags FBINFO_DEFAULT and FBINFO_FLAG_DEFAULT from > >>>> fbdev and drivers, as briefly discussed at [1]. Both flags were maybe > >>>> useful when fbdev had special handling for driver modules. With > >>>> commit 376b3ff54c9a ("fbdev: Nuke FBINFO_MODULE"), they are both 0 > >>>> and have no further effect. > >>>> > >>>> Patches 1 to 7 remove FBINFO_DEFAULT from drivers. Patches 2 to 5 > >>>> split this by the way the fb_info struct is being allocated. All flags > >>>> are cleared to zero during the allocation. > >>>> > >>>> Patches 8 to 16 do the same for FBINFO_FLAG_DEFAULT. Patch 8 fixes > >>>> an actual bug in how arch/sh uses the tokne for struct fb_videomode, > >>>> which is unrelated. > >>>> > >>>> Patch 17 removes both flag constants from <linux/fb.h> > >>> > >>> We have a few more flags that are unused - should they be nuked too? > >>> FBINFO_HWACCEL_FILLRECT > >>> FBINFO_HWACCEL_ROTATE > >>> FBINFO_HWACCEL_XPAN > >> > >> It seems those are there for completeness. Nothing sets _ROTATE, > > I think some fbdev drivers had hardware acceleration for ROTATE in the > past. HWACCEL_XPAN is still in some drivers. > > >> the others are simply never checked. According to the comments, > >> some are required, some are optional. I don't know what that > >> means. > > I think it's OK if you remove those flags which aren't used anywhere, > e.g. FBINFO_HWACCEL_ROTATE. Indeed. > >> IIRC there were complains about performance when Daniel tried to remove > >> fbcon acceleration, so not all _HWACCEL_ flags are unneeded. > > Correct. I think COPYAREA and FILLRECT are the bare minimum to accelerate > fbcon, IMAGEBLIT is for showing the tux penguin (?), > XPAN/YPAN and YWRAP for some hardware screen panning needed by some drivers > (not sure if this is still used as I don't have such hardware, Geert?). Yes, they are used. Anything that is handled in drivers/video/fbdev/core/ is used: $ git grep HWACCEL_ -- drivers/video/fbdev/core/ drivers/video/fbdev/core/fbcon.c: if ((info->flags & FBINFO_HWACCEL_COPYAREA) && drivers/video/fbdev/core/fbcon.c: !(info->flags & FBINFO_HWACCEL_DISABLED)) drivers/video/fbdev/core/fbcon.c: int good_pan = (cap & FBINFO_HWACCEL_YPAN) && drivers/video/fbdev/core/fbcon.c: int good_wrap = (cap & FBINFO_HWACCEL_YWRAP) && drivers/video/fbdev/core/fbcon.c: int fast_copyarea = (cap & FBINFO_HWACCEL_COPYAREA) && drivers/video/fbdev/core/fbcon.c: !(cap & FBINFO_HWACCEL_DISABLED); drivers/video/fbdev/core/fbcon.c: int fast_imageblit = (cap & FBINFO_HWACCEL_IMAGEBLIT) && drivers/video/fbdev/core/fbcon.c: !(cap & FBINFO_HWACCEL_DISABLED); BTW, I'm surprised FBINFO_HWACCEL_FILLRECT is not handled. But looking at the full history, it never was... > >> Leaving them in for reference/completeness might be an option; or not. I > >> have no strong feelings about those flags. > > I'd say drop FBINFO_HWACCEL_ROTATE at least ? Agreed. Gr{oetje,eeting}s, Geert
Am 11.07.23 um 16:47 schrieb Sam Ravnborg: > Hi Thomas, > > On Tue, Jul 11, 2023 at 08:24:40AM +0200, Thomas Zimmermann wrote: >> Hi Sam >> >> Am 10.07.23 um 19:19 schrieb Sam Ravnborg: >>> Hi Thomas, >>> >>> On Mon, Jul 10, 2023 at 02:50:04PM +0200, Thomas Zimmermann wrote: >>>> Remove the unused flags FBINFO_DEFAULT and FBINFO_FLAG_DEFAULT from >>>> fbdev and drivers, as briefly discussed at [1]. Both flags were maybe >>>> useful when fbdev had special handling for driver modules. With >>>> commit 376b3ff54c9a ("fbdev: Nuke FBINFO_MODULE"), they are both 0 >>>> and have no further effect. >>>> >>>> Patches 1 to 7 remove FBINFO_DEFAULT from drivers. Patches 2 to 5 >>>> split this by the way the fb_info struct is being allocated. All flags >>>> are cleared to zero during the allocation. >>>> >>>> Patches 8 to 16 do the same for FBINFO_FLAG_DEFAULT. Patch 8 fixes >>>> an actual bug in how arch/sh uses the tokne for struct fb_videomode, >>>> which is unrelated. >>>> >>>> Patch 17 removes both flag constants from <linux/fb.h> >>> >>> We have a few more flags that are unused - should they be nuked too? >>> FBINFO_HWACCEL_FILLRECT >>> FBINFO_HWACCEL_ROTATE >>> FBINFO_HWACCEL_XPAN >> >> It seems those are there for completeness. Nothing sets _ROTATE, the others >> are simply never checked. According to the comments, some are required, some >> are optional. I don't know what that means. >> >> IIRC there were complains about performance when Daniel tried to remove >> fbcon acceleration, so not all _HWACCEL_ flags are unneeded. >> >> Leaving them in for reference/completeness might be an option; or not. I >> have no strong feelings about those flags. >> >>> >>> Unused as in no references from fbdev/core/* >>> >>> I would rather see one series nuke all unused FBINFO flags in one go. >>> Assuming my quick grep are right and the above can be dropped. >> >> I would not want to extend this series. I'm removing _DEFAULT as it's >> absolutely pointless and confusing. > > OK, makes sense and thanks for the explanation. > > The series is: > Acked-by: Sam Ravnborg <sam@ravnborg.org> Thanks a lot. >
Remove the unused flags FBINFO_DEFAULT and FBINFO_FLAG_DEFAULT from fbdev and drivers, as briefly discussed at [1]. Both flags were maybe useful when fbdev had special handling for driver modules. With commit 376b3ff54c9a ("fbdev: Nuke FBINFO_MODULE"), they are both 0 and have no further effect. Patches 1 to 7 remove FBINFO_DEFAULT from drivers. Patches 2 to 5 split this by the way the fb_info struct is being allocated. All flags are cleared to zero during the allocation. Patches 8 to 16 do the same for FBINFO_FLAG_DEFAULT. Patch 8 fixes an actual bug in how arch/sh uses the tokne for struct fb_videomode, which is unrelated. Patch 17 removes both flag constants from <linux/fb.h> [1] https://lore.kernel.org/dri-devel/877crer8fm.fsf@minerva.mail-host-address-is-not-set/ Thomas Zimmermann (17): drm: Remove flag FBINFO_DEFAULT from fbdev emulation fbdev: Remove flag FBINFO_DEFAULT from fbdev drivers fbdev: Remove flag FBINFO_DEFAULT from fbdev drivers fbdev: Remove flag FBINFO_DEFAULT from fbdev drivers fbdev: Remove flag FBINFO_DEFAULT from fbdev drivers fbdev/fsl-diu-fb: Remove flag FBINFO_DEFAULT vfio-mdev: Remove flag FBINFO_DEFAULT from fbdev sample driver arch/sh: Do not assign FBINFO_FLAG_DEFAULT to fb_videomode.flag auxdisplay: Remove flag FBINFO_FLAG_DEFAULT from fbdev drivers hid/picolcd: Remove flag FBINFO_FLAG_DEFAULT from fbdev driver media: Remove flag FBINFO_FLAG_DEFAULT from fbdev drivers staging: Remove flag FBINFO_FLAG_DEFAULT from fbdev drivers fbdev: Remove flag FBINFO_FLAG_DEFAULT from fbdev drivers fbdev: Remove flag FBINFO_FLAG_DEFAULT from fbdev drivers fbdev/atafb: Remove flag FBINFO_FLAG_DEFAULT fbdev/pxafb: Remove flag FBINFO_FLAG_DEFAULT fbdev: Remove FBINFO_DEFAULT and FBINFO_FLAG_DEFAULT arch/sh/boards/mach-sh7763rdp/setup.c | 1 - drivers/auxdisplay/cfag12864bfb.c | 1 - drivers/auxdisplay/ht16k33.c | 1 - drivers/gpu/drm/drm_fbdev_dma.c | 1 - drivers/gpu/drm/drm_fbdev_generic.c | 1 - drivers/gpu/drm/gma500/fbdev.c | 2 +- drivers/gpu/drm/radeon/radeon_fbdev.c | 2 +- drivers/hid/hid-picolcd_fb.c | 1 - drivers/media/pci/ivtv/ivtvfb.c | 1 - drivers/media/test-drivers/vivid/vivid-osd.c | 1 - drivers/staging/fbtft/fbtft-core.c | 2 +- drivers/staging/sm750fb/sm750.c | 1 - drivers/video/fbdev/68328fb.c | 2 +- drivers/video/fbdev/acornfb.c | 2 +- drivers/video/fbdev/amba-clcd.c | 1 - drivers/video/fbdev/amifb.c | 5 ++--- drivers/video/fbdev/arcfb.c | 1 - drivers/video/fbdev/asiliantfb.c | 1 - drivers/video/fbdev/atafb.c | 1 - drivers/video/fbdev/atmel_lcdfb.c | 2 +- drivers/video/fbdev/aty/aty128fb.c | 1 - drivers/video/fbdev/aty/atyfb_base.c | 3 +-- drivers/video/fbdev/aty/radeon_base.c | 3 +-- drivers/video/fbdev/broadsheetfb.c | 2 +- drivers/video/fbdev/bw2.c | 1 - drivers/video/fbdev/carminefb.c | 1 - drivers/video/fbdev/cg14.c | 2 +- drivers/video/fbdev/cg3.c | 1 - drivers/video/fbdev/cg6.c | 2 +- drivers/video/fbdev/chipsfb.c | 1 - drivers/video/fbdev/cirrusfb.c | 3 +-- drivers/video/fbdev/clps711x-fb.c | 1 - drivers/video/fbdev/cobalt_lcdfb.c | 1 - drivers/video/fbdev/controlfb.c | 2 +- drivers/video/fbdev/cyber2000fb.c | 2 +- drivers/video/fbdev/da8xx-fb.c | 1 - drivers/video/fbdev/efifb.c | 1 - drivers/video/fbdev/ep93xx-fb.c | 1 - drivers/video/fbdev/ffb.c | 3 +-- drivers/video/fbdev/fm2fb.c | 1 - drivers/video/fbdev/fsl-diu-fb.c | 2 +- drivers/video/fbdev/g364fb.c | 2 +- drivers/video/fbdev/gbefb.c | 1 - drivers/video/fbdev/geode/gx1fb_core.c | 1 - drivers/video/fbdev/geode/gxfb_core.c | 1 - drivers/video/fbdev/geode/lxfb_core.c | 1 - drivers/video/fbdev/goldfishfb.c | 1 - drivers/video/fbdev/grvga.c | 2 +- drivers/video/fbdev/gxt4500.c | 3 +-- drivers/video/fbdev/hecubafb.c | 2 +- drivers/video/fbdev/hgafb.c | 2 +- drivers/video/fbdev/hitfb.c | 2 +- drivers/video/fbdev/hpfb.c | 1 - drivers/video/fbdev/hyperv_fb.c | 2 -- drivers/video/fbdev/i740fb.c | 2 +- drivers/video/fbdev/i810/i810_main.c | 4 ++-- drivers/video/fbdev/imsttfb.c | 3 +-- drivers/video/fbdev/imxfb.c | 3 +-- drivers/video/fbdev/intelfb/intelfbdrv.c | 5 ++--- drivers/video/fbdev/kyro/fbdev.c | 1 - drivers/video/fbdev/leo.c | 1 - drivers/video/fbdev/macfb.c | 1 - drivers/video/fbdev/matrox/matroxfb_crtc2.c | 5 ++--- drivers/video/fbdev/maxinefb.c | 1 - drivers/video/fbdev/mb862xx/mb862xxfbdrv.c | 2 +- drivers/video/fbdev/metronomefb.c | 2 +- drivers/video/fbdev/mmp/fb/mmpfb.c | 2 +- drivers/video/fbdev/mx3fb.c | 1 - drivers/video/fbdev/neofb.c | 2 +- drivers/video/fbdev/nvidia/nvidia.c | 4 ++-- drivers/video/fbdev/offb.c | 2 +- drivers/video/fbdev/omap/omapfb_main.c | 1 - drivers/video/fbdev/omap2/omapfb/omapfb-main.c | 1 - drivers/video/fbdev/p9100.c | 1 - drivers/video/fbdev/platinumfb.c | 1 - drivers/video/fbdev/pm2fb.c | 3 +-- drivers/video/fbdev/pm3fb.c | 3 +-- drivers/video/fbdev/pmag-aa-fb.c | 1 - drivers/video/fbdev/pmag-ba-fb.c | 1 - drivers/video/fbdev/pmagb-b-fb.c | 1 - drivers/video/fbdev/ps3fb.c | 2 +- drivers/video/fbdev/pvr2fb.c | 2 +- drivers/video/fbdev/pxa168fb.c | 2 +- drivers/video/fbdev/pxafb.c | 2 -- drivers/video/fbdev/q40fb.c | 1 - drivers/video/fbdev/riva/fbdev.c | 3 +-- drivers/video/fbdev/s1d13xxxfb.c | 4 ++-- drivers/video/fbdev/s3c-fb.c | 1 - drivers/video/fbdev/sa1100fb.c | 1 - drivers/video/fbdev/savage/savagefb_driver.c | 3 +-- drivers/video/fbdev/sh_mobile_lcdcfb.c | 2 -- drivers/video/fbdev/simplefb.c | 1 - drivers/video/fbdev/sis/sis_main.c | 5 +---- drivers/video/fbdev/skeletonfb.c | 2 +- drivers/video/fbdev/sm501fb.c | 2 +- drivers/video/fbdev/sm712fb.c | 1 - drivers/video/fbdev/smscufx.c | 2 +- drivers/video/fbdev/sstfb.c | 1 - drivers/video/fbdev/sunxvr1000.c | 1 - drivers/video/fbdev/sunxvr2500.c | 1 - drivers/video/fbdev/sunxvr500.c | 1 - drivers/video/fbdev/tcx.c | 1 - drivers/video/fbdev/tdfxfb.c | 2 +- drivers/video/fbdev/tgafb.c | 2 +- drivers/video/fbdev/tridentfb.c | 2 +- drivers/video/fbdev/udlfb.c | 2 +- drivers/video/fbdev/uvesafb.c | 3 +-- drivers/video/fbdev/valkyriefb.c | 1 - drivers/video/fbdev/vermilion/vermilion.c | 2 +- drivers/video/fbdev/vesafb.c | 2 +- drivers/video/fbdev/vfb.c | 1 - drivers/video/fbdev/vga16fb.c | 2 +- drivers/video/fbdev/via/viafbdev.c | 2 +- drivers/video/fbdev/vt8500lcdfb.c | 3 +-- drivers/video/fbdev/wm8505fb.c | 3 +-- drivers/video/fbdev/xen-fbfront.c | 2 +- drivers/video/fbdev/xilinxfb.c | 1 - include/linux/fb.h | 3 --- samples/vfio-mdev/mdpy-fb.c | 1 - 119 files changed, 65 insertions(+), 150 deletions(-)