linux-kernel - Re: [PATCH v5 0/5] Add iProc PCIe PAXC and MSI support

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Message-ID: <5665ECC3.9040808@gmail.com>
Date:	Mon, 07 Dec 2015 12:32:03 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Bjorn Helgaas <helgaas@...nel.org>, Ray Jui <rjui@...adcom.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Hauke Mehrtens <hauke@...ke-m.de>,
	linux-kernel@...r.kernel.org,
	bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org
Subject: Re: [PATCH v5 0/5] Add iProc PCIe PAXC and MSI support

On 07/12/15 09:01, Bjorn Helgaas wrote:
> On Fri, Dec 04, 2015 at 09:34:57AM -0800, Ray Jui wrote:
>> This patch series adds support for the iProc PAXC interface and support for
>> event queue based MSI, integrated in the iProc PCIe core
>>
>> This patch series is based on Linux v4.4-rc1 and is avaliable here:
>> https://github.com/Broadcom/cygnus-linux/tree/iproc-msi-v5
>>
>> Changes from v4:
>> - Make 'iproc_msi_exit' inline to fix compiler warning when CONFIG_PCI_MSI
>> is disabled
>>
>> Changes from v3:
>> - Detect the number of possible CPUs instead online CPUs in the driver. Note
>> CPU notifier based implementation still needs to be added in the future, for
>> proper support of MSI IRQ affinity when CPU is brought online/offline at
>> runtime. Support in this dirver will be added when we support CPU hotplug in
>> one of iProc family of SoCs so the changes can be tested
>> - Use dma_zalloc_coherent for event queue host memory allocation and zeoring
>>
>> Changes from v2:
>> - Improved descriptions in the iProc MSI commit message
>> - Removed redundant host memory used for MSI address. The MSI posted writes
>> never really hit the memory. Use iProc PCIe controller base address instead
>> - Fixed deadlock when MSI vectors are used up
>> - Enforced the number of MSI groups to always be multiple of the number of CPUs
>> - Improved the efficiency of MSI event processing by only updating the head
>> pointer after finishing processing all outstanding events
>> - Fixed error handling code to make sure all configurations are rolled back
>> - Added code to zero the host memory used for event queues after allocation
>> - Removed redundant 'brcm,num-eq-region' and 'brcm,num-msi-msg-region' DT
>>   properties. Now determine the number of regions based on interface type
>> - Other misc. changes
>>
>> Changes from v1:
>> - Fixed incorrect 1-to-1 mapping between MSI vector and GIC interrupt. Now the
>> driver supports multiple MSI vectors per GIC interrupt
>> - Added MSI IRQ affinity support by distributing GIC interrupts across
>> available CPU cores and dynamically steer MSI vectors to the target CPU
>> - replace readl/writel with readl_relaxed/writel_relaxed since all register
>> accesses within the iProc MSI driver are to/from the same I/O block, i.e., the
>> iProc PCIe core
>> - Removed all redundant irq_chip callback assignments
>> - Changed to use uncached host memory for both MSI posted writes and event
>> queues
>> - Add functions to free resources in error/exit cases
>> - In pcie-iproc-platform.c, pass in interface type through OF device data
>> - Moved define for max number of interrupts from pcie-iproc.h to
>> pcie-iproc-msi.c
>> - Other misc. changes
>>
>> Ray Jui (5):
>>   PCI: iproc: Update iProc PCIe device tree binding
>>   PCI: iproc: Add PAXC interface support
>>   PCI: iproc: Add iProc PCIe MSI device tree binding
>>   PCI: iproc: Add iProc PCIe MSI support
>>   ARM: dts: Enable MSI support for Broadcom Cygnus
>>
>>  .../devicetree/bindings/pci/brcm,iproc-pcie.txt    |  40 +-
>>  arch/arm/boot/dts/bcm-cygnus.dtsi                  |  22 +
>>  drivers/pci/host/Kconfig                           |   9 +
>>  drivers/pci/host/Makefile                          |   1 +
>>  drivers/pci/host/pcie-iproc-bcma.c                 |   1 +
>>  drivers/pci/host/pcie-iproc-msi.c                  | 675 +++++++++++++++++++++
>>  drivers/pci/host/pcie-iproc-platform.c             |  25 +-
>>  drivers/pci/host/pcie-iproc.c                      | 228 +++++--
>>  drivers/pci/host/pcie-iproc.h                      |  42 +-
>>  9 files changed, 1000 insertions(+), 43 deletions(-)
>>  create mode 100644 drivers/pci/host/pcie-iproc-msi.c
> 
> Applied to pci/host-iproc for v4.5, with Marc's reviewed-by on "PCI: iproc:
> Add iProc PCIe MSI support".  Thanks!

Including the last patch, or should I take this one via arm-soc? Thanks!
-- 
Florian
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