Problems with Kernels 3.17-rc1 and onwards on Acube Sam460 AMCC 460ex board
Julian Margetson
runaway at candw.ms
Thu Feb 19 12:36:07 AEDT 2015
On 2/18/2015 8:13 PM, Michael Ellerman wrote:
> On Wed, 2015-02-18 at 15:45 -0400, Julian Margetson wrote:
>> On 2/15/2015 8:18 PM, Michael Ellerman wrote:
>>
>>> On Sun, 2015-02-15 at 08:16 -0400, Julian Margetson wrote:
>>>> Hi
>>>>
>>>> I am unable to get any kernel beyond the 3.16 branch working on an
>>>> Acube Sam460ex
>>>> AMCC 460ex based motherboard. Kernel up 3.16.7-ckt6 working.
>>> Does reverting b0345bbc6d09 change anything?
>>>
>>>> [ 6.364350] snd_hda_intel 0001:81:00.1: enabling device (0000 -> 0002)
>>>> [ 6.453794] snd_hda_intel 0001:81:00.1: ppc4xx_setup_msi_irqs: fail mapping irq
>>>> [ 6.487530] Unable to handle kernel paging request for data at address 0x0fa06c7c
>>>> [ 6.495055] Faulting instruction address: 0xc032202c
>>>> [ 6.500033] Vector: 300 (Data Access) at [efa31cf0]
>>>> [ 6.504922] pc: c032202c: __reg_op+0xe8/0x100
>>>> [ 6.509697] lr: c0014f88: msi_bitmap_free_hwirqs+0x50/0x94
>>>> [ 6.515600] sp: efa31da0
>>>> [ 6.518491] msr: 21000
>>>> [ 6.521112] dar: fa06c7c
>>>> [ 6.523915] dsisr: 0
>>>> [ 6.526190] current = 0xef8bab00
>>>> [ 6.529603] pid = 115, comm = kworker/0:1
>>>> [ 6.534163] enter ? for help
>>>> [ 6.537054] [link register ] c0014f88 msi_bitmap_free_hwirqs+0x50/0x94
>>>> [ 6.543811] [efa31da0] c0014f78 msi_bitmap_free_hwirqs+0x40/0x94 (unreliable)
>>>> [ 6.551001] [efa31dc0] c001aee8 ppc4xx_setup_msi_irqs+0xac/0xf4
>>>> [ 6.556973] [efa31e00] c03503a4 pci_enable_msi_range+0x1e0/0x280
>>>> [ 6.563032] [efa31e40] f92c2f74 azx_probe_work+0xe0/0x57c [snd_hda_intel]
>>>> [ 6.569906] [efa31e80] c0036344 process_one_work+0x1e8/0x2f0
>>>> [ 6.575627] [efa31eb0] c003677c worker_thread+0x2f4/0x438
>>>> [ 6.581079] [efa31ef0] c003a3e4 kthread+0xc8/0xcc
>>>> [ 6.585844] [efa31f40] c000aec4 ret_from_kernel_thread+0x5c/0x64
>>>> [ 6.591910] mon> <no input ...>
>> Managed to do a third git bisect with the following results .
> Great work.
>
>> git bisect bad
>> 9279d3286e10736766edcaf815ae10e00856e448 is the first bad commit
>> commit 9279d3286e10736766edcaf815ae10e00856e448
>> Author: Rasmus Villemoes <linux at rasmusvillemoes.dk>
>> Date: Wed Aug 6 16:10:16 2014 -0700
>>
>> lib: bitmap: change parameter of bitmap_*_region to unsigned
>>
>> Changing the pos parameter of __reg_op to unsigned allows the compiler
>> to generate slightly smaller and simpler code. Also update its callers
>> bitmap_*_region to receive and pass unsigned int. The return types of
>> bitmap_find_free_region and bitmap_allocate_region are still int to
>> allow a negative error code to be returned. An int is certainly capable
>> of representing any realistic return value.
> So that looks feasible as the culprit.
>
> Looking at the 4xx MSI code, it just looks wrong:
>
> static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> {
> ...
>
> list_for_each_entry(entry, &dev->msi_list, list) {
> int_no = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
> if (int_no >= 0)
> break;
>
> That's backward, a *negative* return indicates an error.
>
> if (int_no < 0) {
> pr_debug("%s: fail allocating msi interrupt\n",
> __func__);
> }
>
> This is the correct check, but it just prints a warning and then continues,
> which is not going to work.
>
> virq = irq_of_parse_and_map(msi_data->msi_dev, int_no);
>
> This will fail if int_no is negative.
>
> if (virq == NO_IRQ) {
> dev_err(&dev->dev, "%s: fail mapping irq\n", __func__);
> msi_bitmap_free_hwirqs(&msi_data->bitmap, int_no, 1);
>
> And so here we can pass a negative int_no to the free routine, which then oopses.
>
> return -ENOSPC;
> }
>
>
> So the bug is in the 4xx MSI code, and has always been there, in fact I don't
> see how that code has *ever* worked. The commit you bisected to just caused the
> existing bug to cause an oops.
>
> Can you try this?
>
> diff --git a/arch/powerpc/sysdev/ppc4xx_msi.c b/arch/powerpc/sysdev/ppc4xx_msi.c
> index 6e2e6aa378bb..effb5b878a78 100644
> --- a/arch/powerpc/sysdev/ppc4xx_msi.c
> +++ b/arch/powerpc/sysdev/ppc4xx_msi.c
> @@ -95,11 +95,9 @@ static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
>
> list_for_each_entry(entry, &dev->msi_list, list) {
> int_no = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
> - if (int_no >= 0)
> - break;
> if (int_no < 0) {
> - pr_debug("%s: fail allocating msi interrupt\n",
> - __func__);
> + pr_warn("%s: fail allocating msi interrupt\n", __func__);
> + return -ENOSPC;
> }
> virq = irq_of_parse_and_map(msi_data->msi_dev, int_no);
> if (virq == NO_IRQ) {
>
> cheers
>
>
>
>
Thanks.
This works with 3.17-rc1. Will try with the 3.18 Branch .
Any ideas why drm is not working ? (It never worked) .
[ 5.809802] Linux agpgart interface v0.103
[ 6.137893] [drm] Initialized drm 1.1.0 20060810
[ 6.439872] snd_hda_intel 0001:81:00.1: enabling device (0000 -> 0002)
[ 6.508544] ppc4xx_setup_msi_irqs: fail allocating msi interrupt
[ 6.652019] input: HDA ATI HDMI HDMI/DP,pcm=3 as /devices/pci0001:80/0001:80: 00.0/0001:81:00.1/sound/card0/input3
[ 7.091160] snd_ice1724 0000:42:00.0: No matching model found for ID 0x121403 24
[ 7.357382] [drm] radeon kernel modesetting enabled.
[ 7.465477] [drm] initializing kernel modesetting (TURKS 0x1002:0x6758 0x1682 :0x318B).
[ 7.619111] [drm] register mmio base: 0xe90000000
[ 7.675162] [drm] register mmio size: 131072
[ 7.977217] ATOM BIOS: TURKS
[ 7.980411] radeon 0001:81:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003 FFFFFFF (1024M used)
[ 7.989602] radeon 0001:81:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007F FFFFFF
[ 7.998154] [drm] Detected VRAM RAM=1024M, BAR=256M
[ 8.003107] [drm] RAM width 128bits DDR
[ 8.007196] [TTM] Zone kernel: Available graphics memory: 380708 kiB
[ 8.014116] [TTM] Zone highmem: Available graphics memory: 1036068 kiB
[ 8.020685] [TTM] Initializing pool allocator
[ 8.025093] [TTM] Initializing DMA pool allocator
[ 8.030730] [drm] radeon: 1024M of VRAM memory ready
[ 8.035793] [drm] radeon: 1024M of GTT memory ready.
[ 8.040862] [drm] Loading TURKS Microcode
[ 8.485902] [drm] Internal thermal controller with fan control
[ 8.501363] [drm] radeon: dpm initialized
[ 8.540582] [drm] GART: num cpu pages 262144, num gpu pages 262144
[ 8.591547] [drm] PCIE GART of 1024M enabled (table at 0x0000000000273000).
[ 8.615342] radeon 0001:81:00.0: WB enabled
[ 8.620473] radeon 0001:81:00.0: fence driver on ring 0 use gpu addr 0x000000 0040000c00 and cpu addr 0xc55d0c00
[ 8.631217] radeon 0001:81:00.0: fence driver on ring 3 use gpu addr 0x000000 0040000c0c and cpu addr 0xc55d0c0c
[ 8.668198] radeon 0001:81:00.0: fence driver on ring 5 use gpu addr 0x000000 0000072118 and cpu addr 0xf9832118
[ 8.678526] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 8.685176] [drm] Driver supports precise vblank timestamp query.
[ 8.691508] ppc4xx_setup_msi_irqs: fail allocating msi interrupt
[ 8.697625] [drm] radeon: irq initialized.
[ 8.727173] [drm] ring test on 0 succeeded in 1 usecs
[ 8.923064] [drm:r600_dma_ring_test] *ERROR* radeon: ring 3 test failed (0xCA FEDEAD)
[ 8.931197] radeon 0001:81:00.0: disabling GPU acceleration
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