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Message-ID: <CAGmqid=FsThBb3nwagT5WF9drD4gW=Q2tHTCvbihuVP0eMP1vw@mail.gmail.com>
Date: Tue, 10 Dec 2013 09:32:57 -0800
From: Natarajan Gurumoorthy <natg@...gle.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Nithin Nayak Sujir <nsujir@...adcom.com>,
Michael Chan <mchan@...adcom.com>,
netdev <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] PCI: Add quirk to initialize REG_BASE_ADDR to 0 for
Broadcom TIGON3 chips.
Looks like we are going to abandon this patch and go with the original
one line fix to drivers/net/ethenet/broadcom/tg3.c.
Nat
On Mon, Dec 9, 2013 at 4:32 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Mon, Dec 9, 2013 at 4:57 PM, Nat Gurumoorthy <natg@...gle.com> wrote:
>> The new tg3 driver leaves REG_BASE_ADDR (PCI config offset 120)
>> uninitialized. From power on reset this register may have garbage in it. The
>> Register Base Address register defines the device local address of a
>> register. The data pointed to by this location is read or written using
>> the Register Data register (PCI config offset 128). When REG_BASE_ADDR has
>> garbage any read or write of Register Data Register (PCI 128) will cause the
>> PCI bus to lock up. The TCO watchdog will fire and bring down the system.
>>
>> Signed-off-by: <natg@...gle.com>
>> ---
>> drivers/pci/quirks.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 138 insertions(+)
>>
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index 3a02717..b9a289b 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -3461,3 +3461,141 @@ int pci_dev_specific_acs_enabled(struct pci_dev *dev, u16 acs_flags)
>>
>> return -ENOTTY;
>> }
>> +
>> +/*
>> + * This is a quirk is to initialize REG_BASE_ADDR at PCI config offset 120
>> + * to 0 for all Broadcom devices controlled by the TIGON3 driver.
>> + */
>> +static void tg3_init_reg_base_addr(struct pci_dev *dev)
>> +{
>> + pci_write_config_dword(dev, 120, 0);
>> +}
>> +
>> +
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5700,
>> + tg3_init_reg_base_addr);
>
> Wow, this looks like a maintenance nightmare :) It wouldn't be quite
> so bad if we knew that Broadcom were changing this register so it had
> a defined state after reset. If we have to add IDs for every new chip
> to this list, that will really be a hassle. And it's not a very
> obvious failure, so the list would only be updated haphazardly.
>
> "lspci -x" only shows the first 64 bytes, and the man page warns that
> "lspci -xxx", which dumps all config space, causes some PCI devices to
> crash. So it seems a little odd that the /sys/.../config file gives
> us 256 bytes (at least). I don't know the history of that size,
> though. Hmmm...
>
> Bjorn
>
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5701,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5702,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5703,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5704,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5702FE,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5705,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5705_2,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5705M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5705M_2,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5702X,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5703X,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5704S,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5702A3,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5703A3,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5782,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5788,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5789,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5901,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5901_2,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5704S_2,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5705F,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5721,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5722,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5751,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5751M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5751F,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5752,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5752M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5753,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5753M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5753F,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5754,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5754M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5755,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5755M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5756,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5786,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5787,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5787M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5787F,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5714,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5714S,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5715,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5715S,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5780,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5780S,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5781,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5906,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5906M,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5784,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5764,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5723,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5761,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5761E,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SYSKONNECT,
>> + PCI_DEVICE_ID_SYSKONNECT_9DXX,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SYSKONNECT,
>> + PCI_DEVICE_ID_SYSKONNECT_9MXX,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ALTIMA, PCI_DEVICE_ID_ALTIMA_AC1000,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ALTIMA, PCI_DEVICE_ID_ALTIMA_AC1001,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ALTIMA, PCI_DEVICE_ID_ALTIMA_AC1003,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ALTIMA, PCI_DEVICE_ID_ALTIMA_AC9100,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_TIGON3,
>> + tg3_init_reg_base_addr);
>> +DECLARE_PCI_FIXUP_EARLY(0x10cf, 0x11a2, tg3_init_reg_base_addr);
>> --
>> 1.8.5.1
>>
--
Regards
Nat Gurumoorthy AB6SJ
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