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Message-Id: <20080402223056.f708881b.akpm@linux-foundation.org> Date: Wed, 2 Apr 2008 22:30:56 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: "Denys Fedoryshchenko" <denys@...p.net.lb> Cc: linux-kernel@...r.kernel.org, linux-fbdev-devel@...ts.sourceforge.net Subject: Re: atyfb rmmod & vram crash, 2.6.24, 2.6.25-rc8 On Thu, 3 Apr 2008 08:22:19 +0300 "Denys Fedoryshchenko" <denys@...p.net.lb> wrote: > Well, additionally i am not able to manage this FB driver to work on my VGA, > while uvesafb works fine (but probably slower). But it is probably sync > problems with my TV-Out, i am still investigating it. But again, uvesafb works > great. OK. > Btw just a bit offtopic question, do i need to report here about such issues, > while i can find for myself another solution? Maybe better to not take time of > developers for such not important things? Or better to "bugtest" kernel and to > make it better together? No, you did fine. You forgot to cc the fbdev mailing list, but I fixed that. Thanks for helping. > On Wed, 2 Apr 2008 14:55:54 -0700, Andrew Morton wrote > > On Wed, 2 Apr 2008 15:54:12 +0300 > > "Denys Fedoryshchenko" <denys@...p.net.lb> wrote: > > > > > VGA card i dont know how much RAM there actually, but lspci here shows looks > > > like 16MB: > > > > > > 03:09.0 VGA compatible controller: ATI Technologies Inc 3D Rage Pro 215GP (rev > > > 5c) (prog-if 00 [VGA controller]) > > > Subsystem: ATI Technologies Inc Rage Pro Turbo > > > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- > > > Stepping+ SERR- FastB2B- DisINTx- > > > Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- > > > <TAbort- <MAbort- >SERR- <PERR- INTx- > > > Latency: 66 (2000ns min), Cache Line Size: 32 bytes > > > Interrupt: pin A routed to IRQ 21 > > > Region 0: Memory at f0000000 (32-bit, prefetchable) [size=16M] > > > Region 1: I/O ports at 2000 [size=256] > > > Region 2: Memory at d0121000 (32-bit, non-prefetchable) [size=4K] > > > Kernel driver in use: atyfb > > > > > > > > > > > > Loading without parameters > > > > > > atyfb: using auxiliary register aperture > > > atyfb: 3D RAGE PRO (Mach64 GP, PQFP, PCI) [0x4750 rev 0x7c] > > > atyfb: Mach64 BIOS is located at c0000, mapped at c00c0000. > > > atyfb: BIOS frequency table: > > > atyfb: PCLK_min_freq 984, PCLK_max_freq 23600, ref_freq 2950, ref_divider 64 > > > atyfb: MCLK_pwd 4200, MCLK_max_freq 7500, XCLK_max_freq 10000, SCLK_freq 5000 > > > atyfb: 8M SGRAM (1:1), 29.498928 MHz XTAL, 236 MHz PLL, 75 Mhz MCLK, 100 > MHz XCLK > > > atyfb: fb0: ATY Mach64 frame buffer device on PCI > > > > > > It detects 8M. > > > If i put parameter vram=8 > > > atyfb: 3D RAGE PRO (Mach64 GP, PQFP, PCI) [0x4750 rev 0x7c] > > > atyfb: Mach64 BIOS is located at c0000, mapped at c00c0000. > > > atyfb: BIOS frequency table: > > > atyfb: PCLK_min_freq 984, PCLK_max_freq 23600, ref_freq 2950, ref_divider 64 > > > atyfb: MCLK_pwd 4200, MCLK_max_freq 7500, XCLK_max_freq 10000, SCLK_freq 5000 > > > atyfb: 0M SGRAM (1:1), 29.498928 MHz XTAL, 236 MHz PLL, 75 Mhz MCLK, 100 > MHz XCLK > > > atyfb: not enough video RAM > > > atyfb: can't set default video mode > > > > Why did this happen? It seems from reading the code that the vram > > arg is in kilobytes, yes? > Also from various sources, like Documentation/fb/intel810.txt > <<< SNIP >>> > e. "vram:<value>" > select amount of system RAM in MB to allocate for the video memory > > Recommendation: 1 - 4 MB. > (default = 4) > <<< SNIP >>> > > I tried also 8388608, sure it doesn't work too. This parameter seems doesn't > work at all. When i didn't specify it - it shows amount or RAM (which looks > invalid), when i specify it any value (i try 2 or 8 or 16) - it shows 0MB and > crashing. OK. > > > > > And most interesting when i do rmmod > > > tv1 ~ # rmmod atyfb > > > Segmentation fault > > > > > > and dmesg: > > > BUG: unable to handle kernel NULL pointer dereference at 00000448 > > > IP: [<ce8fd0f2>] :atyfb:aty_set_crtc+0x9/0x19d > > > *pde = 00000000 > > > Oops: 0000 [#1] SMP > > > Modules linked in: atyfb(-) fb backlight cfbcopyarea cfbimgblt cfbfillrect > > > rtc_cmos rtc_core rtc_lib e100 mii snd_intel8x0 snd_ac97_codec ac97_bus > > > snd_pcm snd_timer snd soundcore snd_page_alloc i2c_i801 i2c_core rng_core > > > iTCO_wdt uhci_hcd usbcore [last unloaded: atyfb] > > > > > > Pid: 5198, comm: rmmod Not tainted (2.6.25-rc8-video #1) > > > EIP: 0060:[<ce8fd0f2>] EFLAGS: 00010286 CPU: 1 > > > EIP is at aty_set_crtc+0x9/0x19d [atyfb] > > > EAX: 00000000 EBX: 00000000 ECX: cd8c6854 EDX: ce9064a0 > > > ESI: ce9064a0 EDI: ce905830 EBP: cc9a1ed0 ESP: cc9a1ec8 > > > DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 > > > Process rmmod (pid: 5198, ti=cc9a1000 task=cc9da000 task.ti=cc9a1000) > > > Stack: 00000000 ccacd000 cc9a1ee0 ce900d20 cd8c6800 ce905830 cc9a1eec c01c8376 > > > cd8c6854 cc9a1efc c0208c92 cd8c3854 cd8c6854 cc9a1f10 c02090c1 ce905830 > > > 00000000 c0369060 cc9a1f24 c02086bc 00000000 ce905830 00000880 cc9a1f34 > > > Call Trace: > > > [<ce900d20>] ? atyfb_pci_remove+0x1d/0xb3 [atyfb] > > > [<c01c8376>] ? pci_device_remove+0x19/0x39 > > > [<c0208c92>] ? __device_release_driver+0x60/0x7d > > > [<c02090c1>] ? driver_detach+0x8e/0xcd > > > [<c02086bc>] ? bus_remove_driver+0x63/0x7f > > > [<c020914c>] ? driver_unregister+0x2a/0x2e > > > [<c01c852e>] ? pci_unregister_driver+0x1e/0x64 > > > [<ce900d01>] ? atyfb_exit+0xd/0xf [atyfb] > > > [<c013be85>] ? sys_delete_module+0x195/0x1d0 > > > [<c0110b8c>] ? do_page_fault+0x251/0x505 > > > [<c012e5cd>] ? up_read+0x16/0x29 > > > [<c0110b8c>] ? do_page_fault+0x251/0x505 > > > [<c0103892>] ? sysenter_past_esp+0x5f/0x91 > > > ======================= > > > Code: 01 00 00 00 e8 84 ff ff ff a8 02 74 0e 8b 07 89 83 dc 03 00 00 8b b3 50 > > > 04 00 00 89 f0 5b 5e 5f 5d c3 55 89 e5 56 53 89 c3 89 d6 <83> b8 48 04 00 00 > > > 00 74 5f 8b 52 2c 81 e2 ff ff ff fc 8b 80 48 > > > EIP: [<ce8fd0f2>] aty_set_crtc+0x9/0x19d [atyfb] SS:ESP 0068:cc9a1ec8 > > > ---[ end trace 1c998179e35e2f76 ]--- > > > > > > I will try to enable more debug, but probably this information is enough? > > > > > > > Looks like incoming arg `par' is NULL in aty_set_crtc(). > > > > I suspect the problem is that the module shouldn't have successfully > > loaded at all, given that its fb_ops.fb_set_par() failed? > Maybe, at least it must not crash such ugly way. I am not enough programmer to > give comments about code. Alas, I don't think we have an atyfb maintainer, and our official fbdev maintainer (Tony Daplas) has been out of contact for a couple of months. (This has happened before and I expect he'll return). Meanwhile a few other people are helping out. But it may take us some time to get onto this. If nothing happens, please do send a repeat bug report in a month or so. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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