linux-kernel - [PATCH v5 0/2] PCI: dwc: Add support for 64-bit MSI target addresses

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Date:   Thu, 25 Aug 2022 18:50:23 +0000
From:   Will McVicker <willmcvicker@...gle.com>
To:     Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        "Krzysztof Wilczyński" <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Will McVicker <willmcvicker@...gle.com>
Cc:     kernel-team@...roid.com, Vidya Sagar <vidyas@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Robin Murphy <robin.murphy@....com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v5 0/2] PCI: dwc: Add support for 64-bit MSI target addresses

Hi All,

I have updated the second patch to first try allocating the DMA buffer
with a 32-bit mask. If that fails and the host supports a 64-bit msi_msg
buffer, then the driver will retry the allocation with a 64-bit DMA mask.

I rebased the series and tested with a Pixel 6 on 6.0-rc1
(android-mainline) and a db845c with 5.15. Thanks for the reviews!

Regards,
Will

Will McVicker (2):
  PCI: dwc: Drop dependency on ZONE_DMA32
  PCI: dwc: Add support for 64-bit MSI target address

v5:
 * Updated patch 2/2 to first try with a 32-bit DMA mask. On failure,
   retry with a 64-bit mask if supported.

v4:
 * Updated commit descriptions.
 * Renamed msi_64b -> msi_64bit.
 * Dropped msi_64bit ternary use.
 * Dropped export of dw_pcie_msi_capabilities.

v3:
  * Switched to a managed DMA allocation.
  * Simplified the DMA allocation cleanup.
  * Dropped msi_page from struct dw_pcie_rp.
  * Allocating a u64 instead of a full page.

v2:
  * Fixed build error caught by kernel test robot
  * Fixed error handling reported by Isaac Manjarres

 .../pci/controller/dwc/pcie-designware-host.c | 54 ++++++++++---------
 drivers/pci/controller/dwc/pcie-designware.c  |  8 +++
 drivers/pci/controller/dwc/pcie-designware.h  |  2 +-
 3 files changed, 39 insertions(+), 25 deletions(-)

base-commit: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
-- 
2.37.2.672.g94769d06f0-goog