[PATCH 0/4] Redesign MSI-X support in PCIe Endpoint Core
Gustavo.Pimentel at synopsys.com
Thu Jan 9 02:33:02 PST 2020
On Thu, Jan 9, 2020 at 10:19:17, Kishon Vijay Abraham I <kishon at ti.com>
> On 12/12/19 4:16 AM, Bjorn Helgaas wrote:
> > On Wed, Dec 11, 2019 at 06:16:04PM +0530, Kishon Vijay Abraham I wrote:
> >> Existing MSI-X support in Endpoint core has limitations:
> >> 1) MSIX table (which is mapped to a BAR) is not allocated by
> >> anyone. Ideally this should be allocated by endpoint
> >> function driver.
> >> 2) Endpoint controller can choose any random BARs for MSIX
> >> table (irrespective of whether the endpoint function driver
> >> has allocated memory for it or not)
> >> In order to avoid these limitations, pci_epc_set_msix() is
> >> modified to include BAR Indicator register (BIR) configuration
> >> and MSIX table offset as arguments. This series also fixed MSIX
> >> support in dwc driver and add MSI-X support in Cadence PCIe driver.
> >> The previous version of Cadence EP MSI-X support is @ .
> >> This series is created on top of 
> >>  -> https://urldefense.proofpoint.com/v2/url?u=https-3A__patchwork.ozlabs.org_patch_971160_&d=DwICaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=bkWxpLoW-f-E3EdiDCCa0_h0PicsViasSlvIpzZvPxs&m=mDuurD6XufzL6j14X2LHC1ulMbU5dbmCtVUYVtCxNFM&s=IEKU31dHkOuXDfERPV1_QZ0U_BsjgCFgLwoE2ipAhFU&e=
> >>  -> https://urldefense.proofpoint.com/v2/url?u=http-3A__lore.kernel.org_r_20191209092147.22901-2D1-2Dkishon-40ti.com&d=DwICaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=bkWxpLoW-f-E3EdiDCCa0_h0PicsViasSlvIpzZvPxs&m=mDuurD6XufzL6j14X2LHC1ulMbU5dbmCtVUYVtCxNFM&s=9-DXCyz6iyuFk67BCnXeBt8HtJ-OOczk6ug_0ZZBgVE&e=
> >> Alan Douglas (1):
> >> PCI: cadence: Add MSI-X support to Endpoint driver
> >> Kishon Vijay Abraham I (3):
> >> PCI: endpoint: Fix ->set_msix() to take BIR and offset as arguments
> >> PCI: dwc: Fix dw_pcie_ep_raise_msix_irq() to get correct MSIX table
> >> address
> >> PCI: keystone: Add AM654 PCIe Endpoint to raise MSIX interrupt
> > Trivial nits:
> > - There's a mix of "MSI-X" and "MSIX" in the subjects, commit logs,
> > and comments. I prefer "MSI-X" to match usage in the spec.
> > - "Fixes:" tags need not include "commit". It doesn't *hurt*
> > anything, but it takes up space that could be used for the
> > subject.
> > - Commit references typically use a 12-char SHA1. Again, doesn't
> > hurt anything.
> I'll fix all this in my next revision.
> Xiaowei, Gustavo,
> The issues we discussed in  should be fixed with this series. Can
> you help test this in your platforms?
I didn't forget this, but unfortunately, I still don't have the HW
prototype required to be able to test this (there are some resources and
roadmap constraints that are blocking this).
To avoid blocking you and Xiaomi, I 'd suggest (assuming this MSI-X API
rework is working for layerscape and keystone drivers) to continue with
this patch series and take it to the mainline. If I get some problem with
my setup (as soon as I get the required conditions to test) I'll deal
with it then.
>  -> https://urldefense.proofpoint.com/v2/url?u=https-3A__lkml.org_lkml_2019_11_6_678&d=DwICaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=bkWxpLoW-f-E3EdiDCCa0_h0PicsViasSlvIpzZvPxs&m=mDuurD6XufzL6j14X2LHC1ulMbU5dbmCtVUYVtCxNFM&s=CbZ63jR-UW-NMY3U39htnXhperbQxlQX6dMQ9zpvBXg&e=
More information about the linux-arm-kernel