Linux-PCI Archive on lore.kernel.org
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From: Bjorn Helgaas <helgaas@kernel.org>
To: Hannes Reinecke <hare@suse.de>
Cc: Daniel Drake <drake@endlessm.com>, Jens Axboe <axboe@kernel.dk>,
	Sagi Grimberg <sagi@grimberg.me>,
	Linux PCI <linux-pci@vger.kernel.org>,
	Keith Busch <keith.busch@gmail.com>,
	linux-ide@vger.kernel.org,
	linux-nvme <linux-nvme@lists.infradead.org>,
	Keith Busch <kbusch@kernel.org>,
	Linux Upstreaming Team <linux@endlessm.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] PCI: Add Intel remapped NVMe device support
Date: Wed, 19 Jun 2019 08:52:12 -0500
Message-ID: <20190619135212.GB143205@google.com> (raw)
In-Reply-To: <1f56c881-9005-f8ad-1557-5efd6e0ef535@suse.de>

On Tue, Jun 18, 2019 at 05:15:52PM +0200, Hannes Reinecke wrote:
> On 6/18/19 10:06 AM, Daniel Drake wrote:

> > We can probably also use these registers for MSI support. I
> > started to experiment, doesn't quite work but I'll keep poking.
> > The doc suggests there is a single MSI-X vector for the AHCI SATA
> > device, and AHCI MSI-X Starting Vector (AMXV) has value 0x140 on
> > this platform. No idea how to interpret that value. From
> > experimentation, the AHCI SATA disk generates interrupts on vector
> > 0.
> > 
> The 0x140 is probably the offset into the PCI config space where the
> AHCI MSI-X vector table can be found ...

An MSI-X vector table is in memory space, not config space.  You'd
have to look at PCI_MSIX_TABLE_BIR to find which BAR maps it, and then
add PCI_MSIX_TABLE_OFFSET to the BAR value.

Bjorn

  reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10  7:44 Daniel Drake
2019-06-10 16:00 ` Keith Busch
2019-06-11  2:46   ` Daniel Drake
2019-06-12 14:32     ` Keith Busch
2019-06-13  8:54       ` Christoph Hellwig
2019-06-14  2:26         ` Daniel Drake
2019-06-14 19:36           ` Keith Busch
2019-06-14 20:05             ` Bjorn Helgaas
2019-06-14 21:05               ` Keith Busch
2019-06-18  7:48                 ` Hannes Reinecke
2019-06-18  7:46           ` Hannes Reinecke
2019-06-18  8:06             ` Daniel Drake
2019-06-18 15:15               ` Hannes Reinecke
2019-06-19 13:52                 ` Bjorn Helgaas [this message]
2019-06-10 21:16 ` Bjorn Helgaas
2019-06-11  3:25   ` Daniel Drake
2019-06-11 19:52     ` Bjorn Helgaas
2019-06-12  3:16       ` Daniel Drake
2019-06-12 13:49         ` Bjorn Helgaas

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