Re: PCI enumeration without a BIOS

From: Wesley Terpstra <wesley@sifive.com>
To: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
	linux-pci@vger.kernel.org, linux-arch@vger.kernel.org,
	Michal Simek <michal.simek@xilinx.com>,
	rfi@lists.rocketboards.org
Subject: Re: PCI enumeration without a BIOS
Date: Wed, 5 Apr 2017 18:59:19 -0700	[thread overview]
Message-ID: <CAMgXwTj2sKhn9XB+6aEgZyxjgnv3njLks26XG6B0nL3BEMiivw@mail.gmail.com> (raw)
In-Reply-To: <1491441105.50673.2.camel@intel.com>

On Wed, Apr 5, 2017 at 6:11 PM, Ley Foon Tan <ley.foon.tan@intel.com> wrote:
> We have fixed this in last year.

Right, for host/pcie-altera.c
However, the problem persists in host/pcie-xilinx.c and host/pcie-xilinx-nwl.c

> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/comm
> it/drivers/pci/host/pcie-
> altera.c?id=99496bd2971fc378226ad4413e5b72c4545714bd
>
>>
>> >
>> > Without it I see:
>> >
>> > [    6.230000] ------------[ cut here ]------------
>> > [    6.230000] WARNING: CPU: 0 PID: 1 at
>> > /scratch/terpstra/freedom-u-sdk/linux/kernel/irq/irqdomain.c:365
>> > irq_domain_associate+0x190/0x200
>> > [    6.240000] error: hwirq 0x4 is too large for dummy
>> > [    6.250000] CPU: 0 PID: 1 Comm: swapper Not tainted
>> > 4.11.0-rc1-661305-g4f97179 #12
>> > [    6.250000] Call Trace:
>> > [    6.260000] [<ffffffff80288660>] walk_stackframe+0x0/0x104
>> > [    6.260000] [<ffffffff80288800>] show_stack+0x38/0x50
>> > [    6.270000] [<ffffffff803c6e30>] dump_stack+0x2c/0x40
>> > [    6.270000] [<ffffffff8028c600>] __warn+0x118/0x130
>> > [    6.280000] [<ffffffff8028c658>] warn_slowpath_fmt+0x40/0x54
>> > [    6.280000] [<ffffffff802c02a8>]
>> > irq_domain_associate+0x18c/0x200
>> > [    6.290000] [<ffffffff802c0a3c>] irq_create_mapping+0x90/0xe4
>> > [    6.300000] [<ffffffff802c0be4>]
>> > irq_create_fwspec_mapping+0x154/0x288
>> > [    6.300000] [<ffffffff802c0d7c>] irq_create_of_mapping+0x64/0x84
>> > [    6.310000] [<ffffffff804f9cb8>]
>> > of_irq_parse_and_map_pci+0x38/0x50
>> > [    6.310000] [<ffffffff80407e00>] pci_fixup_irqs+0x6c/0x114
>> > [    6.320000] [<ffffffff80408e64>] xilinx_pcie_probe+0x308/0x3f0
>> > [    6.330000] [<ffffffff8042cba4>] platform_drv_probe+0x3c/0x88
>> > [    6.330000] [<ffffffff8042aec0>] really_probe+0xbc/0x260
>> > [    6.340000] [<ffffffff8042b138>] __driver_attach+0xd4/0xdc
>> > [    6.340000] [<ffffffff80429200>] bus_for_each_dev+0x68/0xb8
>> > [    6.350000] [<ffffffff8042b640>] driver_attach+0x24/0x38
>> > [    6.350000] [<ffffffff80429db8>] bus_add_driver+0x1b4/0x22c
>> > [    6.360000] [<ffffffff8042bdc0>] driver_register+0x68/0x12c
>> > [    6.360000] [<ffffffff8042da78>]
>> > __platform_driver_register+0x48/0x5c
>> > [    6.370000] [<ffffffff8000db38>]
>> > xilinx_pcie_driver_init+0x20/0x34
>> > [    6.380000] [<ffffffff80000d48>] do_one_initcall+0x98/0x140
>> > [    6.380000] [<ffffffff80000f38>]
>> > kernel_init_freeable+0x148/0x218
>> > [    6.390000] [<ffffffff805ad19c>] kernel_init+0x18/0x114
>> > [    6.390000] [<ffffffff80286cac>] ret_from_syscall+0xc/0x10
>> > [    6.400000] ---[ end trace 8023adf5befc91e0 ]---
>> >
>> > ... that said, I am not confident my patch is the right fix. So
>> > consider this a bug report + work-around only. :)
>> >
>> > >
>> > > Yeah, everything seems mostly working.  The "invalid BAR" things
>> > > *could* be an issue -- those registers are not what the PCI spec
>> > > says
>> > > they should be.
>> > The devices in question are:
>> > 04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
>> > RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
>> > 06:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9230
>> > PCIe
>> > SATA 6Gb/s Controller (rev 11)
>> >
>> > I am going to plug them in to an Intel machine with 4.11 and see if
>> > I
>> > get the same warnings.
>>
>
> Regards
> Ley Foon