Date: Thu, 1 Dec 2016 14:55:49 +0100
From: Robert Richter <robert.richter@cavium.com>
To: Tomasz Nowicki <tn@semihalf.com>
CC: Bjorn Helgaas <helgaas@kernel.org>, <will.deacon@arm.com>,
        <catalin.marinas@arm.com>, <rafael@kernel.org>,
        <Lorenzo.Pieralisi@arm.com>, <arnd@arndb.de>, <jchandra@broadcom.com>,
        <ard.biesheuvel@linaro.org>, <mw@semihalf.com>,
        <ddaney@caviumnetworks.com>, <linux-pci@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>, <linaro-acpi@lists.linaro.org>,
        <andrea.gallo@linaro.org>, <jeremy.linton@arm.com>,
        <liudongdong3@huawei.com>, <gabriele.paoloni@huawei.com>,
        <linux-acpi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <jcm@redhat.com>, <msalter@redhat.com>,
        Christopher Covington <cov@codeaurora.org>
Subject: Re: [PATCH V1 1/2] PCI: thunder: Enable ACPI PCI controller for
 ThunderX pass2.x silicon version
Message-ID: <20161201135549.GP2213@rric.localdomain>
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Tomasz, Bjorn,

On 01.12.16 09:49:51, Tomasz Nowicki wrote:
> I put the picture together here (on top of your pci/ecam branch):
> [1] https://github.com/semihalf-nowicki-tomasz/linux/commits/pci-quirks-thunderx-v2

please note that acpi_* functions must be protected with acpi_disabled
or something else to make sure an acpi enabled kernel does not break
dt. See the crash below with above branch.

-Robert

[   12.493028] Unable to handle kernel NULL pointer dereference at virtual address 00000018
[   12.501113] pgd = ffff0000090a0000
[   12.504511] [00000018] *pgd=0000010fffef0003[   12.508602] , *pud=0000010fffef0003
, *pmd=0000010fffee0003[   12.514093] , *pte=0000000000000000
[   12.517575]
[   12.519064] Internal error: Oops: 96000005 [#1] SMP
[   12.523933] Modules linked in:
[   12.526987] CPU: 73 PID: 1 Comm: swapper/0 Tainted: G        W       4.9.0-rc6.0.vanilla10-00019-g09abd2b6bbeb #135
[   12.537409] Hardware name: Cavium ThunderX CRB/To be filled by O.E.M., BIOS 5.11 12/12/2012
[   12.545748] task: ffff800fe85b8000 task.stack: ffff800ff4288000
[   12.551674] PC is at acpi_ns_walk_namespace+0x68/0x1d4
[   12.556803] LR is at acpi_get_devices+0x6c/0x94
...
[   13.124920] [<ffff0000084dc5a0>] acpi_ns_walk_namespace+0x68/0x1d4
[   13.131090] [<ffff0000084dcadc>] acpi_get_devices+0x6c/0x94
[   13.136663] [<ffff0000084c0aec>] acpi_resource_consumer+0x34/0x44
[   13.142752] [<ffff000008496bc0>] pci_ecam_create+0x80/0x228
[   13.148314] [<ffff000008498e64>] pci_host_common_probe+0x294/0x348
[   13.154486] [<ffff00000849bf3c>] thunder_ecam_probe+0x2c/0x38
[   13.160226] [<ffff0000085880b8>] platform_drv_probe+0x60/0xc8
[   13.165970] [<ffff000008585a04>] driver_probe_device+0x26c/0x420
[   13.171966] [<ffff000008585cdc>] __driver_attach+0x124/0x128
[   13.177615] [<ffff000008583238>] bus_for_each_dev+0x70/0xb0
[   13.183177] [<ffff000008585060>] driver_attach+0x30/0x40
[   13.188478] [<ffff000008584a98>] bus_add_driver+0x200/0x2b8
[   13.194041] [<ffff000008586860>] driver_register+0x68/0x100
[   13.199602] [<ffff000008587fdc>] __platform_driver_register+0x54/0x60
[   13.206038] [<ffff000008c39b98>] thunder_ecam_driver_init+0x18/0x20
[   13.212296] [<ffff000008082d94>] do_one_initcall+0x44/0x138
[   13.217862] [<ffff000008c00d0c>] kernel_init_freeable+0x1ac/0x24c
[   13.223950] [<ffff0000088605f0>] kernel_init+0x18/0x110
[   13.229165] [<ffff000008082b30>] ret_from_fork+0x10/0x20