DMA ring test failure on Radeon HD 8970M

[Joe Julian]

Alex Deucher <alexdeucher at gmail.com> wrote:
>On Fri, Nov 29, 2013 at 7:30 PM, Joe Julian <joe at julianfamily.org>
>wrote:
>>
>> This MSI laptop has two crossfire connected video processors in it,
>> 00:01.0 has a HD 8650G that seems to initialize properly, and at
>01:00.0
>> an HD 8970M that fails the ring 3 test, "radeon: ring 3 test failed
>(0xDFCFFBFF)".
>
>It looks like there's a problem with the rom for the dGPU:
>
>[   61.008250] ACPI Error: Field [TEMP] at 524288 exceeds Buffer
>[TVGA] size 512000 (bits) (20130927/dsopcode-236)
>[   61.008749] ACPI Error: Method parse/execution failed
>[\_SB_.PCI0.VGA_.ATRM] (Node ffff880233ad1e30), AE_AML_BUFFER_LIMIT
>(20130927/psparse-536)
>[   61.009991] failed to evaluate ATRM got AE_AML_BUFFER_LIMIT
>[   61.010204] ATOM BIOS: MSI
>[   61.010270] [drm] GPU not posted. posting now...
>[   61.018737] radeon 0000:01:00.0: limiting VRAM
>[   61.018765] radeon 0000:01:00.0: VRAM: 1047552M 0x0000000000000000
>- 0x000000FFBFFFFFFF (1047552M used)
>[   61.018814] radeon 0000:01:00.0: GTT: 1024M 0x000000FFC0000000 -
>0x000000FFFFFFFFFF
>[   61.018853] [drm] Detected VRAM RAM=1047552M, BAR=256M
>
>1047552M of vram is obviously wrong.  How much vram is supposed to be
>on the card?

According to Windows, 2GB:
Name    AMD Radeon(TM) HD8970M
PNP Device ID    PCI\VEN_1002&DEV_6801&SUBSYS_10F11462&REV_00\4&99EBB28&0&0018
Adapter Type    AMD Radeon Graphics Processor (0x6801), Advanced Micro Devices, Inc. compatible
Adapter Description    AMD Radeon(TM) HD8970M
Adapter RAM    (2,147,483,648) bytes
Installed Drivers    aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver Version    13.200.11.0
INF File    oem17.inf (ati2mtag_R576B section)
Color Planes    Not Available
Color Table Entries    4294967296
Resolution    1920 x 1080 x 60 hertz
Bits/Pixel    32
Memory Address    0xD0000000-0xDFFFFFFF
Memory Address    0xFEAC0000-0xFEAFFFFF
I/O Port    0x0000EF00-0x0000EFFF
IRQ Channel    IRQ 4294967283
>
>Can you send me the output from this patch?
>
>diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
>index 6a64cca..84a7e26 100644
>--- a/drivers/gpu/drm/radeon/si.c
>+++ b/drivers/gpu/drm/radeon/si.c
>@@ -3884,6 +3884,7 @@ static int si_mc_init(struct radeon_device *rdev)
>        /* size in MB on si */
>    rdev->mc.mc_vram_size = RREG32(CONFIG_MEMSIZE) * 1024ULL * 1024ULL;
>  rdev->mc.real_vram_size = RREG32(CONFIG_MEMSIZE) * 1024ULL * 1024ULL;
>+       DRM_INFO("CONFIG_MEMSIZE: 0x%08x\n", RREG32(CONFIG_MEMSIZE));
>        rdev->mc.visible_vram_size = rdev->mc.aper_size;
>        si_vram_gtt_location(rdev, &rdev->mc);
>        radeon_update_bandwidth_info(rdev);
>
>
CONFIG_MEMSIZE=0X03800800
>>
>> Throwing in some writel and readl tests before even trying the dma
>test,
>> I see that the memory isn't being changed with writel in the first
>> place.
>>
>> ----
>>         tmp = 0xDEADBEEF;
>>         writel(tmp, ptr);
>>         tmp = readl(ptr);
>>         if (tmp != 0xDEADBEEF)
>>                 DRM_ERROR("radeon: ring %d memory write failed (0x%
>> 08X)\n", ring->idx, tmp);
>> ----
>>
>> radeon: ring 3 memory write failed (0xDFCFFBFF)
>>
>> Looks to me like we're trying to write to a rom address, but I'm a
>> complete novice at this so I could be completely off.
>>
>>
>> I'm using kernel 3.13.0-0.rc1.git3
>>
>> What else could I look at?
>>
>>
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>>