On Sun, 7 Sep 2003, Jon Smirl wrote:
>
> I'm getting this with standalone Mesa not DRI. Can a someone more familar with
> the R200 kernel DRM driver give me a clue as to what is not being set up
> correctly? I die in RADEON_PURGE_CACHE() in radeon_do_cp_start().
More precisely:
> Unable to handle kernel paging request at virtual address f8a6cffc
> printing eip:
> f8a579f1
> *pde = 01b99067
> *pte = 00000000
> Oops: 0002 [#1]
> CPU: 1
> EIP: 0060:[<f8a579f1>] Not tainted
> EFLAGS: 00010286
> EIP is at radeon_do_cp_start+0x9b/0x1f1 [radeon]
> eax: 0000000b ebx: 0003ffff ecx: c02f18d4 edx: 00005c50
> esi: f8a6d000 edi: ffffffff ebp: f6ae6800 esp: f5959f24
> ds: 007b es: 007b ss: 0068
> Process sample_server (pid: 2045, threadinfo=f5958000 task=ec6f06b0)
> Stack: f8a649a3 00000018 0000000a 00000400 f8a6496c f719d000 f6ae6800 f5c3ce80
> f5c3ce80 f8a591ea f6ae6800 f8a61b29 f8a6273e f5959f88 f719d000 00000041
> f5c4a100 f8a53826 f6de5598 f5c3ce80 00006441 00000000 00000041 0000e200
> Call Trace:
> [<f8a591ea>] radeon_cp_start+0xe1/0xfc [radeon]
> [<f8a53826>] radeon_ioctl+0xce/0x13d [radeon]
> [<c016af59>] sys_ioctl+0xf6/0x274
> [<c010b241>] sysenter_past_esp+0x52/0x71
>
> Code: c7 04 be 0b 0d 00 00 83 c7 01 21 df c7 04 be 0f 00 00 00 c7
The code in question is
** movl $0xd0b,(%esi,%edi,4) **
add $0x1,%edi
and %ebx,%edi
movl $0xf,(%esi,%edi,4)
which looks strange. That's not a NULL pointer derefernce, but %edi is -1,
and %esi is 0xf8a6d000.
As far as I can tell, this is part of OUT_RING() with a value of 0x0d0b.
It looks like the first OUT_RING() in the function, and it _looks_ like
"ring" is %esi, and "write" is %edi.
In other words, in BEGIN_RING():
ring = dev_priv->ring.start; \
write = dev_priv->ring.tail; \
looks like the ring hasn't been initialized. Which looks unlikely, since
it's initialized when it is allocated. .
I have no idea how that could happen, but you might put some debugging
code into BEGIN_RING() to print out if "(ring.tail & ~ring.tail_mask)" is
ever non-zero. It shouldn't be.
Linus
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