linux-kernel - Re: [EXT] Re: [PATCH] PCI: Enhance the ACS quirk for Cavium devices

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Date:   Wed, 9 Oct 2019 02:51:15 +0000
From:   George Cherian <gcherian@...vell.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Robert Richter <rrichter@...vell.com>
CC:     Jayachandran Chandrasekharan Nair <jnair@...vell.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shannon.zhao@...ux.alibaba.com" <shannon.zhao@...ux.alibaba.com>,
        "Sunil Kovvuri Goutham" <sgoutham@...vell.com>
Subject: Re: [EXT] Re: [PATCH] PCI: Enhance the ACS quirk for Cavium devices

Hi Bjorn,

Sorry for the late reply I was off for couple of days.

On 10/8/19 2:32 PM, Bjorn Helgaas wrote:
> External Email
>
> ----------------------------------------------------------------------
> On Tue, Oct 08, 2019 at 08:25:23AM +0000, Robert Richter wrote:
>> On 04.10.19 14:48:13, Bjorn Helgaas wrote:
>>> commit 37b22fbfec2d
>>> Author: George Cherian <george.cherian@...vell.com>
>>> Date:   Thu Sep 19 02:43:34 2019 +0000
>>>
>>>      PCI: Apply Cavium ACS quirk to CN99xx and CN11xxx Root Ports
>>>      
>>>      Add an array of Cavium Root Port device IDs and apply the quirk only to the
>>>      listed devices.
>>>      
>>>      Instead of applying the quirk to all Root Ports where
>>>      "(dev->device & 0xf800) == 0xa000", apply it only to CN88xx 0xa180 and
>>>      0xa170 Root Ports.

All the root ports of CN88xx series will have device id's 0xa180 and 0xa170.

This patch currently targets only CN88xx series and not all of the CN8xxx.

For eg:- 83xx devices don't wont the quirk to be applied as of today. 
The quirk

needs to be applied only for TX1 series and not oncteon-tx1 series.

>> No, this can't be removed. It is a match all for all CN8xxx variants
>> (note the 3 'x', all TX1 cores). So all device ids from 0xa000 to
>> 0xa7FF are affected here and need the quirk.
> OK, I'll drop the patch and wait for a new one.  Maybe what was needed
> was to keep the "(dev->device & 0xf800) == 0xa000" part and add the
> pci_quirk_cavium_acs_ids[] array in addition?
>
>>>      Also apply the quirk to CN99xx (0xaf84) and CN11xxx (0xb884) Root Ports.

The device id's for all variants of CN99xx is 0xaf84 and CN11xxx will be 
0xb884.

So this patch holds good for TX2 as well as TX3 series of processors.


>> I thought the quirk is CN8xxx specific, but I could be wrong here.
>>
>> -Robert
>>
>>>      
>>>      Link: https://urldefense.proofpoint.com/v2/url?u=https-3A__lore.kernel.org_r_20190919024319.GA8792-40dc5-2Deodlnx05.marvell.com&d=DwIBAg&c=nKjWec2b6R0mOyPaz7xtfQ&r=8vKOpC26NZGzQPAMiIlimxyEGCRSJiq-j8yyjPJ6VZ4&m=Vmml-rx3t63ZbbXZ0XaESAM9yAlexE29R-giTbcj4Qk&s=57jKIj8BAydbLpftLt5Ssva7vD6GuoCaIpjTi-sB5kU&e=
>>>      Fixes: f2ddaf8dfd4a ("PCI: Apply Cavium ThunderX ACS quirk to more Root Ports")
>>>      Fixes: b404bcfbf035 ("PCI: Add ACS quirk for all Cavium devices")
>>>      Signed-off-by: George Cherian <george.cherian@...vell.com>
>>>      Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
>>>      Cc: stable@...r.kernel.org      # v4.12+
>>>
>>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>>> index 320255e5e8f8..4e5048cb5ec6 100644
>>> --- a/drivers/pci/quirks.c
>>> +++ b/drivers/pci/quirks.c
>>> @@ -4311,17 +4311,24 @@ static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags)
>>>   #endif
>>>   }
>>>   
>>> +static const u16 pci_quirk_cavium_acs_ids[] = {
>>> +	0xa180, 0xa170,		/* CN88xx family of devices */
>>> +	0xaf84,			/* CN99xx family of devices */
>>> +	0xb884,			/* CN11xxx family of devices */
>>> +};
>>> +
>>>   static bool pci_quirk_cavium_acs_match(struct pci_dev *dev)
>>>   {
>>> -	/*
>>> -	 * Effectively selects all downstream ports for whole ThunderX 1
>>> -	 * family by 0xf800 mask (which represents 8 SoCs), while the lower
>>> -	 * bits of device ID are used to indicate which subdevice is used
>>> -	 * within the SoC.
>>> -	 */
>>> -	return (pci_is_pcie(dev) &&
>>> -		(pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) &&
>>> -		((dev->device & 0xf800) == 0xa000));
>>> +	int i;
>>> +
>>> +	if (!pci_is_pcie(dev) || pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
>>> +		return false;
>>> +
>>> +	for (i = 0; i < ARRAY_SIZE(pci_quirk_cavium_acs_ids); i++)
>>> +		if (pci_quirk_cavium_acs_ids[i] == dev->device)
>>> +			return true;
>>> +
>>> +	return false;
>>>   }
>>>   
>>>   static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)