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SubjectRe: [PATCH 00/10] Save MSI chip in pci_sys_data
[+cc Marc]

On Tue, Nov 11, 2014 at 09:23:59PM -0700, Bjorn Helgaas wrote:
> On Mon, Oct 27, 2014 at 03:48:37PM +0800, Yijing Wang wrote:
> > Now PCI host bridge drivers in arm associate MSI chip and
> > PCI bus by adding .add_bus(), and assign MSI chip pointer
> > to every PCI bus. Associating MSI chip and every PCI bus
> > is not necessary. All PCI busses under same PCI host brdige
> > share the same MSI chip. So saving MSI chip in pci_sys_data
> > is a better solution, it make PCI host bridge drivers clean.
> > Because we still need to provide arch spec pcibios_msi_controller()
> > to extract MSI controller pointer, a better solution is to
> > refactor PCI host bridge, make a generic pci_host_bridge, and
> > save common info like PCI domain number, MSI chip, resources
> > in it. We will do that work in another series as soon.
> >
> > To Bjorn: Because struct msi_chip defined in struct hw_pci and pci_sys_data
> > is under the #ifdef CONFIG_PCI_MSI, if we use if(IS_ENABLED(CONFIG_PCI_MSI))
> > in PCI host bridge drivers, it will cause build errors when the CONFIG_PCI_MSI
> > is off. So I keep #ifdef CONFIG_PCI_MSI in this series.
> >
> > Yijing Wang (10):
> > MSI: Rename msi_chip to msi_controller for better readability
> > PCI/MSI: Introduce weak pcibios_msi_controller()
> > arm/MSI: Save MSI controller in pci_sys_data
> > PCI: tegra: Save MSI controller in pci_sys_data
> > PCI: designware: Save MSI controller in pci_sys_data
> > PCI: rcar: Save MSI controller in pci_sys_data
> > PCI: mvebu: Save MSI controller in pci_sys_data
> > PCI: xilinx: Save MSI controller in pci_sys_data
> > arm/PCI: Clean unused pcibios_add_bus() and pcibios_remove_bus()
> > PCI/MSI: Remove useless bus->msi assignment
> >
> > arch/arm/include/asm/mach/pci.h | 10 +++++---
> > arch/arm/kernel/bios32.c | 28 ++++++++++--------------
> > drivers/irqchip/irq-armada-370-xp.c | 22 +++++++++---------
> > drivers/of/of_pci.c | 40 +++++++++++++++++-----------------
> > drivers/pci/host/pci-keystone-dw.c | 4 +-
> > drivers/pci/host/pci-keystone.h | 2 +-
> > drivers/pci/host/pci-mvebu.c | 14 ++++-------
> > drivers/pci/host/pci-tegra.c | 37 +++++++++++++-------------------
> > drivers/pci/host/pcie-designware.c | 25 +++++++--------------
> > drivers/pci/host/pcie-designware.h | 2 +-
> > drivers/pci/host/pcie-rcar.c | 37 +++++++++++++-------------------
> > drivers/pci/host/pcie-xilinx.c | 27 +++++++----------------
> > drivers/pci/msi.c | 22 ++++++++++++++-----
> > drivers/pci/probe.c | 1 -
> > include/linux/msi.h | 6 ++--
> > include/linux/of_pci.h | 14 ++++++------
> > include/linux/pci.h | 2 +-
> > 17 files changed, 132 insertions(+), 161 deletions(-)
> >
>
> Applied to pci/msi for v3.19, thanks.

I reworked this series slightly to:

- Change pci_msi_controller() and pcibios_msi_controller() from taking a
pci_bus * to taking a pci_dev *. This is so the interface allows
per-device MSI controllers. I don't think there's any reason to assume
all devices on a bus have to have the same controller.

- Drop the last patch ("PCI/MSI: Remove useless bus->msi assignment")
because it broke Marc's follow-on patches.

I updated pci/msi, but I haven't put it in my "next" branch yet because I
want confirmation from Fengguang's autobuilder that I didn't break
anything.

Current status of my tree:

6cf00af0ae15 [1] pci/msi (contains this rework)
149792795d2b [2] next (does *not* contain this rework)

Thomas, if pci/msi looks good to you, feel free to pull it into your tree.
The only change you should need to make is to change the parameters to
pci_msi_controller() and pcibios_msi_controller().

Just FYI, I'm leaving on vacation for a week, so I won't be able to fix any
issues until Dec 1.

Bjorn

[1] https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=next&id=6cf00af0ae15
[2] https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/log/?h=next&id=149792795d2b


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