[Help][RS780E][mipsel]Screen corruption sometimes
Chen Jie
chenj at lemote.com
Tue Aug 23 23:14:31 PDT 2011
Hi,
2011/8/23 Alex Deucher <alexdeucher at gmail.com>
>
> > Not sure I understand it or not, but we're using the sideport way, and
> > has a dedicated 128M DDR2 memory as VRAM.
>
> The default behavior of the system bios is to set up sideport memory
> interleaved with stolen system memory. Unless your bios only enables
> sideport you'll need to respect the stolen system memory used as vram.
> Also, sideport memory has really limited memory bandwidth. It's a
> powersaving feature as if you un-interleave the sideport memory, you
> can put the display in sideport and stop memory access via the CPU.
> For decent performance, you need to use system memory or interleaved
> sideport and system memory.
Got it, thanks.
BTW, if using 128M sideport memory, will it occupy another 128M system
memory in the default behavior?
>
> >
> > The details are at:
> > * http://dev.lemote.com/files/upload/software/temp/Radeon.test/radeon_test.c
> > * diff with original radeon_test_moves():
> > http://dev.lemote.com/files/upload/software/temp/Radeon.test/radeon_test.diff
> >
> > The new bo moving test is pass, but when I changed the bo size to 4M,
> > the kernel panic with unaligned access at some point after bo moving
> > test. The original radeon_test_moves() is ok for 4M bo size. Could
> > someone reviews the new radeon_test_moves() to find if this was caused
> > by some mistakes of the code or is a potential bug of the platform?
>
> See if the attached patch helps. It flushes the HDP caches if the
> driver uses the wait_idle callback rather than flushing in the fence
> emit.
The patch doesn't work for me. P.S. due to we haven't finished a
solid port to a newer version of kernel, the hack was done on the old
2.6.36 kernel(http://dev.lemote.com/cgit/linux-3A.git/)
I did some more hack, and found if create/reserve/pin more bo in VRAM
than available, it will cause unaligned access panic. And a simpler
way to trigger kernel panic(but another kind of kernel panic):
struct radeon_bo **vram_obj = NULL;
uint64_t *vram_addr = NULL;
unsigned i, n, size;
n = 31; /* 30 is the maximum num of bo can be allocated successfully */
size = 4 * 1024 * 1024;
vram_obj = kzalloc(n * sizeof(*vram_obj), GFP_KERNEL);
vram_addr = kzalloc(n * sizeof(*vram_addr), GFP_KERNEL);
for (i = 0; i < n; i++) {
int r;
/* Create bo lives in VRAM */
r = radeon_bo_create(rdev, NULL, size, true, RADEON_GEM_DOMAIN_VRAM,
vram_obj + i);
if (r) {
DRM_ERROR("Failed to create VRAM object %d\n", i);
break;
}
r = radeon_bo_reserve(vram_obj[i], false);
if (unlikely(r != 0))
break;
r = radeon_bo_pin(vram_obj[i], RADEON_GEM_DOMAIN_VRAM, vram_addr + i);
if (r) {
DRM_ERROR("Failed to pin VRAM object %d\n", i);
break;
}
}
/* If I comment the following, no kernel panic for me */
if (vram_obj) {
for (i = 0; i < n; i++) {
if (vram_obj[i]) {
if (radeon_bo_is_reserved(vram_obj[i])) {
radeon_bo_unpin(vram_obj[i]);
radeon_bo_unreserve(vram_obj[i]);
}
radeon_bo_unref(&vram_obj[i]);
}
}
kfree(vram_obj);
}
if (vram_addr)
kfree(vram_addr);
----
The corresponding dmesg log:
[ 1.125000] [drm] Initialized drm 1.1.0 20060810
[ 1.128906] [drm] radeon defaulting to kernel modesetting.
[ 1.136718] [drm] radeon kernel modesetting enabled.
[ 1.175781] [drm] initializing kernel modesetting (RS780 0x1002:0x9615).
[ 1.183593] [drm] register mmio base: 0x48000000
[ 1.187500] [drm] register mmio size: 65536
[ 1.195312] radeon 0000:01:05.0: BAR 6: can't assign [???
0x00000000 flags 0x0] (bogus alignment)
[ 1.203125] ATOM BIOS: BR041389
[ 1.207031] radeon 0000:01:05.0: VRAM: 128M 0x10000000 - 0x17FFFFFF
(128M used)
[ 1.214843] radeon 0000:01:05.0: GTT: 512M 0x18000000 - 0x37FFFFFF
[ 1.222656] [drm] Detected VRAM RAM=128M, BAR=128M
[ 1.226562] [drm] RAM width 32bits DDR
[ 1.230468] [TTM] Zone kernel: Available graphics memory: 464720 kiB.
[ 1.238281] [TTM] Initializing pool allocator.
[ 1.242187] [drm] radeon: 128M of VRAM memory ready
[ 1.246093] [drm] radeon: 512M of GTT memory ready.
[ 1.250000] [drm] radeon: irq initialized.
[ 1.253906] [drm] GART: num cpu pages 32768, num gpu pages 131072
[ 1.265625] [drm] Loading RS780 Microcode
[ 1.343750] [drm] ring test succeeded in 0 usecs
[ 1.347656] [drm] radeon: ib pool ready.
[ 1.351562] [drm] ib test succeeded in 0 usecs
[ 1.355468] [drm] Enabling audio support
[ 1.359375] radeon 0000:01:05.0: 980000013eecbe00 pin failed
[ 1.367187] [drm:radeon_test_moves] *ERROR* Failed to pin VRAM object 31
[ 1.378906] radeon 0000:01:05.0: 980000013eecbe00 unpin not necessary
[ 1.386718] CPU 3 Unable to handle kernel paging request at virtual
address 0000000000000008, epc == ffffffff804aff08, ra ==
ffffffff804aff00
[ 1.398437] Oops[#1]:
[ 1.402343] Cpu 3
[ 1.402343] $ 0 : 0000000000000000 000000001400fce0
980000013eecbe00 0000000000000000
[ 1.402343] $ 4 : 980000013e5e2f50 ffffffff8047a66c
0000000000000000 0000000000000000
[ 1.402343] $ 8 : 0000000000000000 980000000161c000
00004124924d2492 ffffffff81073f20
[ 1.402343] $12 : 0000000000000007 ffffffff810f3ee0
fffffffffffffffc ffffffff81073f28
[ 1.402343] $16 : 980000013eecbe00 980000013eecbe48
980000013e8f7d40 000000000000001f
[ 1.402343] $20 : 980000013e8f7e00 980000013e8f7ef8
0000000000000028 980000013e5e2000
[ 1.402343] $24 : 0000000000000000 ffffffff804afedc
[ 1.402343] $28 : 980000013e044000 980000013e047af0
980000013eecbe00 ffffffff804aff00
[ 1.402343] Hi : 0000000000000000
[ 1.402343] Lo : 00000000011694a8
[ 1.402343] epc : ffffffff804aff08 radeon_ttm_bo_destroy+0x2c/0x68
[ 1.402343] Not tainted
[ 1.402343] ra : ffffffff804aff00 radeon_ttm_bo_destroy+0x24/0x68
[ 1.402343] Status: 1400fce3 KX SX UX KERNEL EXL IE
[ 1.402343] Cause : 0000000c
[ 1.402343] BadVA : 0000000000000008
[ 1.402343] PrId : 00006305 (ICT Loongson-3)
[ 1.402343] Modules linked in:
[ 1.402343] Process swapper (pid: 1, threadinfo=980000013e044000,
task=980000013e078000, tls=0000000000000000)
[ 1.402343] Stack : 980000013eecbe8c 980000013eecbe8c
ffffffff8047a66c ffffffff803f056c
[ 1.402343] 0000000000000028 980000013eecbe48
980000013e5e2530 ffffffff8047b478
[ 1.402343] 0000000000070000 980000013eecbe88
ffffffff8047b418 ffffffff803f056c
[ 1.402343] 000000000000001f 980000013e5e2530
980000013eecbe48 ffffffff8047a950
[ 1.402343] 000000001400fce1 980000013e8f7cf8
980000013e5e3dc0 ffffffff804b0230
[ 1.402343] 0000000000000000 ffffffff8047a554
980000013e8f7cf8 980000013e8f7cf8
[ 1.402343] 980000013e8f7c00 ffffffff804f27bc
980000013e5e2000 0000000000000000
[ 1.402343] 00000000ffffffff 0000000000c20021
980000013e5db800 980000013e5dbbb8
[ 1.402343] 0000000000000004 0000000000000000
0000000000000000 ffffffff8049b85c
[ 1.402343] 980000013e5db800 980000013e5e2000
fffffffffffffff4 ffffffff8049cc08
[ 1.402343] ...
[ 1.402343] Call Trace:
[ 1.402343] [<ffffffff804aff08>] radeon_ttm_bo_destroy+0x2c/0x68
[ 1.402343] [<ffffffff803f056c>] kref_put+0x70/0x90
[ 1.402343] [<ffffffff8047b478>] ttm_bo_release+0x60/0x78
[ 1.402343] [<ffffffff803f056c>] kref_put+0x70/0x90
[ 1.402343] [<ffffffff8047a950>] ttm_bo_unref+0x38/0x50
[ 1.402343] [<ffffffff804b0230>] radeon_bo_unref+0x3c/0x68
[ 1.402343] [<ffffffff804f27bc>] radeon_test_moves+0x174/0x1d0
[ 1.402343] [<ffffffff8049b85c>] radeon_device_init+0x474/0x4b4
[ 1.402343] [<ffffffff8049cc08>] radeon_driver_load_kms+0xcc/0x138
[ 1.402343] [<ffffffff8046c54c>] drm_get_pci_dev+0x140/0x230
[ 1.402343] [<ffffffff80406af0>] local_pci_probe+0x5c/0xd8
[ 1.402343] [<ffffffff80406f48>] pci_device_probe+0x5c/0x9c
[ 1.402343] [<ffffffff80528690>] driver_probe_device+0xe4/0x1c0
[ 1.402343] [<ffffffff805287d8>] __driver_attach+0x6c/0xa4
[ 1.402343] [<ffffffff8052764c>] bus_for_each_dev+0x54/0x94
[ 1.402343] [<ffffffff80527e48>] bus_add_driver+0xbc/0x258
[ 1.402343] [<ffffffff80528ae4>] driver_register+0xc4/0x178
[ 1.402343] [<ffffffff80407310>] __pci_register_driver+0x50/0xe0
[ 1.402343] [<ffffffff802159dc>] do_one_initcall+0x88/0x174
[ 1.402343] [<ffffffff81078c60>] kernel_init+0x208/0x2bc
[ 1.402343] [<ffffffff80217c84>] kernel_thread_helper+0x10/0x18
[ 1.402343]
[ 1.402343]
[ 1.402343] Code: 64840f50 de020008 de23ffb8 <fc620008> fc430000
de0401e0 fe30ffb8 fe100008 0c084d49
[ 1.402343] Disabling lock debugging due to kernel taint
[ 1.750000] Kernel panic - not syncing: Attempted to kill init!
Regards,
- Chen Jie
More information about the xorg-driver-ati
mailing list