https://bugs.freedesktop.org/show_bug.cgi?id=82714
--- Comment #10 from Bruno <bonb...@sysophe.eu> ---
(In reply to Bruno from comment #9)
> Created attachment 114735 [details]
> 4.0-rc6 dmesg of nouveau loading (debug, runpm=0)
The first BUG happens in evo_wait() at line 420 of nv50_display.c
Seems like dmac->ptr[put] is bad.
413: evo_wait(void *evoc, int nr)
414: {
415: struct nv50_dmac *dmac = evoc;
416: u32 put = nvif_rd32(&dmac->base.user, 0x0000) / 4;
417:
418: mutex_lock(&dmac->lock);
419: if (put + nr >= (PAGE_SIZE / 4) - 8) {
420: dmac->ptr[put] = 0x20000000;
421:
422: nvif_wr32(&dmac->base.user, 0x0000, 0x00000000);
423: if (!nvxx_wait(&dmac->base.user, 0x0004, ~0, 0x00000000)) {
424: mutex_unlock(&dmac->lock);
425: nv_error(nvxx_object(&dmac->base.user), "channel stalled\n");
426: return NULL;
427: }
428:
429: put = 0;
430: }
431:
432: return dmac->ptr + put;
433: }
In ASM:
180: 55 push %rbp
181: 48 89 e5 mov %rsp,%rbp
184: 48 83 ec 20 sub $0x20,%rsp
188: 48 89 5d e0 mov %rbx,-0x20(%rbp)
18c: 4c 89 75 f8 mov %r14,-0x8(%rbp)
190: 48 89 fb mov %rdi,%rbx
193: 4c 89 65 e8 mov %r12,-0x18(%rbp)
197: 4c 89 6d f0 mov %r13,-0x10(%rbp)
19b: 41 89 f6 mov %esi,%r14d
19e: 48 8b 47 08 mov 0x8(%rdi),%rax
1a2: 48 8b 78 40 mov 0x40(%rax),%rdi
1a6: 48 85 ff test %rdi,%rdi
1a9: 0f 84 e1 00 00 00 je 290 <evo_wait+0x110>
1af: e8 00 00 00 00 callq 1b4 <evo_wait+0x34>
1b4: c1 e8 02 shr $0x2,%eax
1b7: 4c 8d ab 00 01 00 00 lea 0x100(%rbx),%r13
1be: 41 89 c4 mov %eax,%r12d
1c1: 4c 89 ef mov %r13,%rdi
1c4: 45 01 e6 add %r12d,%r14d
1c7: e8 00 00 00 00 callq 1cc <evo_wait+0x4c>
1cc: 41 81 fe f7 03 00 00 cmp $0x3f7,%r14d
1d3: 0f 86 87 00 00 00 jbe 260 <evo_wait+0xe0>
1d9: 48 8b 43 58 mov 0x58(%rbx),%rax
1dd: 42 c7 04 a0 00 00 00 movl $0x20000000,(%rax,%r12,4)
^
1e4: 20
...
>From the trace:
access at 0xffff880313207ffc (rax - 4)
r12 = 0x000000003fffffff
rax = 0xffff880213208000
Decoded data:
dmac@ffff880214419b70->ptr[put=1073741823] = 0x20000000
That would mean that nvif_rd32(&dmac->base.user, 0x0000) returns 0xffffffff.
That value looks rather "non-initialized" and GPU's PCI bar surly is not 4GB
large.
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