linux-kernel - Re: [PATCH 06/14] PCI/P2PDMA: Add whitelist support for Intel Host Bridges

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Date:   Thu, 25 Jul 2019 13:14:40 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Christian Koenig <Christian.Koenig@....com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Dan Williams <dan.j.williams@...el.com>,
        Eric Pilmore <epilmore@...aio.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH 06/14] PCI/P2PDMA: Add whitelist support for Intel Host
 Bridges



On 2019-07-25 12:52 p.m., Jason Gunthorpe wrote:
> On Mon, Jul 22, 2019 at 05:08:51PM -0600, Logan Gunthorpe wrote:
>> Intel devices do not have good support for P2P requests that span
>> different host bridges as the transactions will cross the QPI/UPI bus
>> and this does not perform well.
>>
>> Therefore, enable support for these devices only if the host bridges
>> match.
>>
>> Adds the Intel device's that have been tested to work. There are
>> likely many others out there that will need to be tested and added.
>>
>> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
>>  drivers/pci/p2pdma.c | 36 ++++++++++++++++++++++++++++++++----
>>  1 file changed, 32 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
>> index dfb802afc8ca..143e11d2a5c3 100644
>> +++ b/drivers/pci/p2pdma.c
>> @@ -250,9 +250,28 @@ static void seq_buf_print_bus_devfn(struct seq_buf *buf, struct pci_dev *pdev)
>>  	seq_buf_printf(buf, "%s;", pci_name(pdev));
>>  }
>>  
>> -static bool __host_bridge_whitelist(struct pci_host_bridge *host)
>> +static const struct pci_p2pdma_whitelist_entry {
>> +	unsigned short vendor;
>> +	unsigned short device;
>> +	bool req_same_host_bridge;
> 
> This would be more readable in the initializer as a flags not a bool

Ok, will change for v2.

Logan