[PATCH v7 3/3] PCI: xilinx-xdma: Add Xilinx XDMA Root Port driver
Havalige, Thippeswamy
thippeswamy.havalige at amd.com
Tue Sep 19 06:21:44 PDT 2023
Hi Bjorn/ Lorenzo/Krzysztof,
Can you please provide any update on this patch series.
Regards,
Thippeswamy H
> -----Original Message-----
> From: Bjorn Helgaas <helgaas at kernel.org>
> Sent: Wednesday, September 6, 2023 10:55 PM
> To: Havalige, Thippeswamy <thippeswamy.havalige at amd.com>
> Cc: linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
> bhelgaas at google.com; krzysztof.kozlowski+dt at linaro.org;
> devicetree at vger.kernel.org; linux-pci at vger.kernel.org; lpieralisi at kernel.org;
> robh at kernel.org; conor+dt at kernel.org; Simek, Michal
> <michal.simek at amd.com>; Gogada, Bharat Kumar
> <bharat.kumar.gogada at amd.com>
> Subject: Re: [PATCH v7 3/3] PCI: xilinx-xdma: Add Xilinx XDMA Root Port driver
>
> On Wed, Aug 30, 2023 at 02:37:07PM +0530, Thippeswamy Havalige wrote:
> > Add support for Xilinx XDMA Soft IP core as Root Port.
> >
> > The Zynq UltraScale+ MPSoCs devices support XDMA soft IP module in
> > programmable logic.
> >
> > The integrated XDMA soft IP block has integrated bridge function that
> > can act as PCIe Root Port.
>
> > + if (!pci_is_root_bus(bus)) {
> > + /* Checking whether the link is up is the last line of
> > + * defense, and this check is inherently racy by definition.
> > + * Sending a PIO request to a downstream device when the
> link is
> > + * down causes an unrecoverable error, and a reset of the
> entire
> > + * PCIe controller will be needed. We can reduce the
> likelihood
> > + * of that unrecoverable error by checking whether the link is
> > + * up, but we can't completely prevent it because the link may
> > + * go down between the link-up check and the PIO request.
> > + */
>
> Looks fine to me. If Lorenzo or Krzysztof thinks this is ready to go, maybe they
> will tidy the comment above, i.e.,
>
> /*
> * Checking whether ...
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