How to make Opengl render on virtual framebuffer

huangjacky — Fri, 16 Oct 2020 10:06:11 GMT

Hi All:

I have built the vfb driver as module, below is the command of insmod driver sequence.

insmod fb_sys_fops.ko
insmod syscopyarea.ko
insmod sysfillrect.ko
insmod sysimgblt.ko
insmod vfb.ko vfb_enable=1 videomemorysize=3686400

my display resolution is 1280x720-32bpp, so I modify the fb_videomode in vfb.c as below:

static const struct fb_videomode vfb_default1 = {

.refresh = 60,

.xres = 1280,

.yres = 720,

.pixclock = 13426,

.left_margin = 192,

.right_margin = 64,

.upper_margin = 22,

.lower_margin = 1,

.hsync_len = 136,

.vsync_len = 3,

.vmode = FB_VMODE_NONINTERLACED,

};

if (!fb_find_mode(&info->var, info, mode_option,

NULL, 0, &vfb_default1, 32)){

fb_err(info, "Unable to find usable video mode.\n");

retval = -EINVAL;

goto err1;

}

after insmod the vfb driver, I got /dev/fb8

however, when my test program run the code:

eglNativeDisplayType = fbGetDisplayByIndex(8);

I got the error and kernel panic as below:

my question is how to use Opengles render on virtual frame buffer.

********************************************************************************************

[ 74.713232] Probing I2c client @ 0x6a on I2C bus #0.
[ 74.718074] Generic camera I2c driver added successfully.
[ 74.723301] Probing I2c client @ 0x40 on I2C bus #0.
[ 74.728356] Probing I2c client @ 0x5d on I2C bus #0.
[ 1] fbdev_GetDisplayByIndex(400): set prefetch failed
width: 1280 height: 720
vObj.num 60672
floorTexture 1
camTexture 2
[ 75.722366] Internal error: undefined instruction: 0 [#1] SMP
[ 75.727758] Modules linked in: vfb sysimgblt sysfillrect syscopyarea fb_sys_fops viulite(O) jpegdcd(O) h264dcd(O) h264enc(O) fdma(O) seq(O) cam(O) csi(O) oal_driver(O) apex(O) sja1105pqrs(O) nxp galco)
[ 75.745968] CPU: 1 PID: -13223110 Comm: fhL�dfJ�ra.elf Tainted: G O 4.14.34-rt27+g5d76987 #4
[ 75.755499] Hardware name: Freescale S32V234 (DT)
[ 75.760183] task: ffffffc07a82a400 task.stack: ffffff800dfe0000
[ 75.766157] PC is at gckKERNEL_OpenUserData+0x70/0xa0 [galcore]
[ 75.772042] LR is at _ProcessUserCommandBufferList.constprop.5+0x54/0x278 [galcore]
[ 75.773219] Unable to handle kernel paging request at virtual address 617956ff5f7955
[ 75.773220] Mem abort info:
[ 75.773223] Exception class = DABT (current EL), IL = 32 bits
[ 75.773225] SET = 0, FnV = 0
[ 75.773226] EA = 0, S1PTW = 0
[ 75.773227] Data abort info:
[ 75.773229] ISV = 0, ISS = 0x00000004
[ 75.773231] CM = 0, WnR = 0
[ 75.773233] [00617956ff5f7955] address between user and kernel address ranges
[ 75.818878] pc : [<ffffff800060dee0>] lr : [<ffffff80006120d4>] pstate: a0000145
[ 75.826246] sp : ffffff800dfe37c0
[ 75.829541] x29: ffffff800dfe37c0 x28: ffffffc07a82a400
[ 75.834830] x27: ffffff8008601000 x26: 000000000000001d
[ 75.840118] x25: 0000000000000124 x24: 000000003da39490
[ 75.845407] x23: ffffff800dfe3db8 x22: ffffffc07b3c9c00
[ 75.850696] x21: 000000003da39490 x20: ffffff800dfe3878
[ 75.855985] x19: ffffff800dfe3890 x18: 0000007fbbe85298
[ 75.861273] x17: 0000007fbd14ed70 x16: ffffff80081983f0
[ 75.866562] x15: 0000007fbbeb79fc x14: 000000003da38980
[ 75.871851] x13: 000000003da395e0 x12: 0000007fbbd4a654
[ 75.877139] x11: 0000007fb176f970 x10: 000000003da38980
[ 75.882428] x9 : 0000000000000000 x8 : 0000007fbbd4a664
[ 75.887717] x7 : 0000000000000000 x6 : 000000003da39490
[ 75.893005] x5 : ffffff800dfe3878 x4 : 0000000000000098
[ 75.898294] x3 : 000000003da39490 x2 : ffffff800dfe3890
[ 75.903583] x1 : 0000000000000001 x0 : ffffffc07b73d200
[ 75.908873] Process fhL�dfJ�ra.elf (pid: -13223110, stack limit = 0xffffff800dfe0000)
[ 75.916675] Call trace:
[ 75.919104] Exception stack(0xffffff800dfe3680 to 0xffffff800dfe37c0)
[ 75.925521] 3680: ffffffc07b73d200 0000000000000001 ffffff800dfe3890 000000003da39490
[ 75.933324] 36a0: 0000000000000098 ffffff800dfe3878 000000003da39490 0000000000000000
[ 75.941126] 36c0: 0000007fbbd4a664 0000000000000000 000000003da38980 0000007fb176f970
[ 75.948929] 36e0: 0000007fbbd4a654 000000003da395e0 000000003da38980 0000007fbbeb79fc
[ 75.956733] 3700: ffffff80081983f0 0000007fbd14ed70 0000007fbbe85298 ffffff800dfe3890
[ 75.964536] 3720: ffffff800dfe3878 000000003da39490 ffffffc07b3c9c00 ffffff800dfe3db8
[ 75.972339] 3740: 000000003da39490 0000000000000124 000000000000001d ffffff8008601000
[ 75.980142] 3760: ffffffc07a82a400 ffffff800dfe37c0 ffffff80006120d4 ffffff800dfe37c0
[ 75.987945] 3780: ffffff800060dee0 00000000a0000145 ffffffc07acd8380 ffffffc07df9f760
[ 75.995748] 37a0: 0000007fffffffff ffffffc07df9f700 ffffff800dfe37c0 ffffff800060dee0
[ 76.003617] [<ffffff800060dee0>] gckKERNEL_OpenUserData+0x70/0xa0 [galcore]
[ 76.010553] [<ffffff80006120d4>] _ProcessUserCommandBufferList.constprop.5+0x54/0x278 [galcore]
[ 76.019223] [<ffffff8000612cdc>] gckCOMMAND_Commit+0x5c/0xb78 [galcore]
[ 76.025812] [<ffffff800061127c>] gckKERNEL_Dispatch+0xe6c/0x1420 [galcore]
[ 76.032661] [<ffffff8000611974>] gckDEVICE_Dispatch+0x144/0x158 [galcore]
[ 76.039423] [<ffffff800060afd8>] drv_ioctl+0xf0/0x1c8 [galcore]
[ 76.045257] [<ffffff8008197c2c>] do_vfs_ioctl+0xa4/0x868
[ 76.050542] [<ffffff800819847c>] SyS_ioctl+0x8c/0xa0
[ 76.055482] Exception stack(0xffffff800dfe3ec0 to 0xffffff800dfe4000)
[ 76.061900] 3ec0: 0000000000000011 0000000000007530 0000007fb176f750 0000000000000190
[ 76.069703] 3ee0: 0000007fb176f7e0 0000000000000190 000000003da0b5f0 0000000000000000
[ 76.077506] 3f00: 000000000000001d 00000000ffffff00 0000007fac000cc0 0000000000000002
[ 76.085309] 3f20: 0000007fac0635e4 000000003df4df0c 0000007fbbe85298 0000007fbbeb79fc
[ 76.093112] 3f40: 0000007fbbe9aca8 0000007fbd14ed70 0000007fbbe85298 0000000000002710
[ 76.100915] 3f60: 0000000000007530 0000007fbbeb7868 0000007fb176f7e0 0000007fb176f750
[ 76.108718] 3f80: 0000000000000190 0000000000000000 0000007fb1770290 0000007fb176f7e0
[ 76.116521] 3fa0: 0000007fbdcb8000 0000007fb176f700 0000007fbbe8036c 0000007fb176f700
[ 76.124324] 3fc0: 0000007fbd14ed7c 0000000020000000 0000000000000011 000000000000001d
[ 76.132126] 3fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 76.139931] [<ffffff8008083040>] el0_svc_naked+0x34/0x38
[ 76.145220] Code: ff383f3e ff383f3e ff39403f ff39403f (ff39403f)
[ 76.151287] ---[ end trace 6c8beec140fabd96 ]---
[ 76.155881] Internal error: Oops: 96000004 [#2] SMP
[ 76.155883] Unable to handle kernel paging request at virtual address 405b56ff415a56
[ 76.155887] Mem abort info:
[ 76.155889] Exception class = DABT (current EL), IL = 32 bits
[ 76.155891] SET = 0, FnV = 0
[ 76.155892] EA = 0, S1PTW = 0
[ 76.155893] Data abort info:
[ 76.155895] ISV = 0, ISS = 0x00000004
[ 76.155896] CM = 0, WnR = 0
[ 76.155898] [00405b56ff415a56] address between user and kernel address ranges
[ 76.200011] Modules linked in: vfb sysimgblt sysfillrect syscopyarea fb_sys_fops viulite(O) jpegdcd(O) h264dcd(O) h264enc(O) fdma(O) seq(O) cam(O) csi(O) oal_driver(O) apex(O) sja1105pqrs(O) nxp galco)
[ 76.218221] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D O 4.14.34-rt27+g5d76987 #4
[ 76.226627] Hardware name: Freescale S32V234 (DT)
[ 76.231310] task: ffffff80087fe600 task.stack: ffffff80087f0000
[ 76.237210] PC is at linflex_timer_func+0x2c/0xe0
[ 76.241889] LR is at linflex_timer_func+0x28/0xe0
[ 76.246569] pc : [<ffffff800838d84c>] lr : [<ffffff800838d848>] pstate: 00000145
[ 76.253937] sp : ffffff8008003db0
[ 76.257232] x29: ffffff8008003db0 x28: 0000000000000020
[ 76.262521] x27: ffffff80087f5190 x26: 0000000000000001
[ 76.267810] x25: ffffff80087f5180 x24: 0000000000000100
[ 76.273098] x23: ffffff80087fe600 x22: ff637855ff627855
[ 76.278387] x21: ffffffc07a8caa18 x20: 0000000000000100
[ 76.283676] x19: ffffffc07a8ca818 x18: 0000000000000000
[ 76.288964] x17: 0000007fbd14da68 x16: ffffff800819b0f0
[ 76.294253] x15: 0000000000000016 x14: 0000000000000000
[ 76.299542] x13: ffffffc07df8b760 x12: 0000000000000000
[ 76.304830] x11: 0000000000000001 x10: ffffff8008003ea0
[ 76.310119] x9 : ffffffc07df85870 x8 : 0000000000000000
[ 76.315408] x7 : 0000000000000006 x6 : 0000000000000040
[ 76.320696] x5 : 0000000000000040 x4 : 000000001fffe4a0
[ 76.325985] x3 : 0000000000000000 x2 : 0000000000000000
[ 76.331274] x1 : ffffffc07a8ca818 x0 : ff617956ff5f7955
[ 76.336564] Process swapper/0 (pid: 0, stack limit = 0xffffff80087f0000)
[ 76.343238] Call trace:
[ 76.345668] Exception stack(0xffffff8008003c70 to 0xffffff8008003db0)
[ 76.352084] 3c60: ff617956ff5f7955 ffffffc07a8ca818
[ 76.359887] 3c80: 0000000000000000 0000000000000000 000000001fffe4a0 0000000000000040
[ 76.367691] 3ca0: 0000000000000040 0000000000000006 0000000000000000 ffffffc07df85870
[ 76.375494] 3cc0: ffffff8008003ea0 0000000000000001 0000000000000000 ffffffc07df8b760
[ 76.383296] 3ce0: 0000000000000000 0000000000000016 ffffff800819b0f0 0000007fbd14da68
[ 76.391099] 3d00: 0000000000000000 ffffffc07a8ca818 0000000000000100 ffffffc07a8caa18
[ 76.398903] 3d20: ff637855ff627855 ffffff80087fe600 0000000000000100 ffffff80087f5180
[ 76.406706] 3d40: 0000000000000001 ffffff80087f5190 0000000000000020 ffffff8008003db0
[ 76.414509] 3d60: ffffff800838d848 ffffff8008003db0 ffffff800838d84c 0000000000000145
[ 76.422312] 3d80: ffffff8008003db0 ffffff800838d848 0000007fffffffff 0000000000000000
[ 76.430113] 3da0: ffffff8008003db0 ffffff800838d84c
[ 76.434971] [<ffffff800838d84c>] linflex_timer_func+0x2c/0xe0
[ 76.440694] [<ffffff80080f2d6c>] call_timer_fn.isra.4+0x24/0x80
[ 76.446588] [<ffffff80080f2e64>] expire_timers+0x9c/0xb0
[ 76.451876] [<ffffff80080f2f00>] run_timer_softirq+0x88/0x158
[ 76.457598] [<ffffff80080811b8>] __do_softirq+0x110/0x238
[ 76.462975] [<ffffff80080a12b0>] irq_exit+0xc8/0x100
[ 76.467917] [<ffffff80080e0240>] __handle_domain_irq+0x60/0xb8
[ 76.473724] [<ffffff8008080ed0>] gic_handle_irq+0x58/0xb0
[ 76.479099] Exception stack(0xffffff80087f3de0 to 0xffffff80087f3f20)
[ 76.485516] 3de0: 0000000000000020 ffffff80087dc785 00000040757a9000 0000000000029d08
[ 76.493319] 3e00: 0000000000000000 ffffff80087f3f20 00000040757a9000 0000000000000001
[ 76.501122] 3e20: ffffff80087fef60 00000000000001c0 0000000000000900 0000000000000000
[ 76.508925] 3e40: 0000000000000001 ffffffc07df8b760 0000000000000000 0000000000000000
[ 76.516728] 3e60: ffffff800819b0f0 0000007fbd14da68 0000000000000000 ffffff80087d9010
[ 76.524531] 3e80: ffffff80087f89b4 ffffff80087f8928 ffffff80087fe600 ffffff80087fe600
[ 76.532334] 3ea0: ffffff80087d0028 00000000fffaf968 0000000000000000 00000000fff6c9a0
[ 76.540137] 3ec0: 0000000080790018 ffffff80087f3f20 ffffff800808486c ffffff80087f3f20
[ 76.547940] 3ee0: ffffff8008084870 0000000060000145 00000000fffaf968 0000000000000000
[ 76.555743] 3f00: ffffffffffffffff ffffff800885b000 ffffff80087f3f20 ffffff8008084870
[ 76.563546] [<ffffff8008082930>] el1_irq+0xb0/0x140
[ 76.568402] [<ffffff8008084870>] arch_cpu_idle+0x10/0x18
[ 76.573691] [<ffffff80080d57d0>] do_idle+0xd8/0x110
[ 76.578545] [<ffffff80080d5960>] cpu_startup_entry+0x20/0x28
[ 76.584183] [<ffffff80085f24c4>] rest_init+0xac/0xb8
[ 76.589124] [<ffffff8008790b70>] start_kernel+0x384/0x398
[ 76.594498] Code: aa1503e0 f9405a76 97f5931f f940da60 (f9400001)
[ 76.600565] ---[ end trace 6c8beec140fabd97 ]---
[ 76.605161] Kernel panic - not syncing: Fatal exception in interrupt
[ 76.611491] SMP: stopping secondary CPUs
[ 77.635847] SMP: failed to stop secondary CPUs 0-1
[ 77.640276] Kernel Offset: disabled
[ 77.643744] CPU features: 0x0802004
[ 77.647210] Memory Limit: none
[ 77.650248] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
[ 77.657377] Unable to handle kernel paging request at virtual address ffffff800d483ea0
[ 77.665244] Mem abort info:
[ 77.668019] Exception class = DABT (current EL), IL = 32 bits
[ 77.673914] SET = 0, FnV = 0
[ 77.676949] EA = 0, S1PTW = 0
[ 77.680070] Data abort info:
[ 77.682931] ISV = 0, ISS = 0x00000007
[ 77.686746] CM = 0, WnR = 0
[ 77.689695] swapper pgtable: 4k pages, 39-bit VAs, pgd = ffffff800889b000
[ 77.696457] [ffffff800d483ea0] *pgd=00000000fdffe803, *pud=00000000fdffe803, *pmd=00000000faac2003, *pte=ffd7d8daffd6d8da

Re: How to make Opengl render on virtual framebuffer

Bio_TICFSL — Fri, 16 Oct 2020 12:59:27 GMT

Hello huangjacky,

Which processor are you using? with BSP version? Your code runs well on MX6Q on L4.19.35 BSP.

Regards

Re: How to make Opengl render on virtual framebuffer

huangjacky — Fri, 16 Oct 2020 13:21:50 GMT

Hi Bio_TICFSL: the Log is printed by S32V, bsp18_kernel_4.14.34. my code is work well on MX6Q with /dev/fb0, but not test for vfb I just porting the code from MX6Q to S32V and render to vfb.

topic How to make Opengl render on virtual framebuffer in i.MX Processors

How to make Opengl render on virtual framebuffer

Re: How to make Opengl render on virtual framebuffer

Re: How to make Opengl render on virtual framebuffer