Hi Suravee,
Just a few minor comments.
On Sat, Sep 20, 2014 at 05:31:37PM +0100, suravee.suthikulpanit@xxxxxxx wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>
> This patch implelments the ARM64 version of arch_setup_msi_irqs(),
> which does not return 1 for when PCI_CAP_ID_MSI and nvec > 1.
s/implelments/implements/
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> Acked-by: Marc Zyngier <Marc.Zyngier@xxxxxxx>
> Cc: Mark Rutland <Mark.Rutland@xxxxxxx>
> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Cc: Catalin Marinas <Catalin.Marinas@xxxxxxx>
> Cc: Will Deacon <Will.Deacon@xxxxxxx>
> ---
> arch/arm64/kernel/Makefile | 1 +
> arch/arm64/kernel/msi.c | 41 +++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 42 insertions(+)
> create mode 100644 arch/arm64/kernel/msi.c
>
> diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
> index df7ef87..a921c42 100644
> --- a/arch/arm64/kernel/Makefile
> +++ b/arch/arm64/kernel/Makefile
> @@ -29,6 +29,7 @@ arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
> arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
> arm64-obj-$(CONFIG_KGDB) += kgdb.o
> arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o
> +arm64-obj-$(CONFIG_PCI_MSI) += msi.o
>
> obj-y += $(arm64-obj-y) vdso/
> obj-m += $(arm64-obj-m)
> diff --git a/arch/arm64/kernel/msi.c b/arch/arm64/kernel/msi.c
> new file mode 100644
> index 0000000..a295862
> --- /dev/null
> +++ b/arch/arm64/kernel/msi.c
> @@ -0,0 +1,41 @@
> +/*
> + * ARM64 architectural MSI implemention
> + *
> + * Support for Message Signalelled Interrupts for systems that
> + * implement ARM Generic Interrupt Controller: GICv2m.
You can drop the GICv2M reference here, as there's not really anything
GIC-specific in this file.
> + * Copyright (C) 2014 Advanced Micro Devices, Inc.
> + * Authors: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation.
> + */
> +
> +#include <linux/irq.h>
> +#include <linux/msi.h>
> +#include <linux/pci.h>
> +
> +/*
> + * ARM64 function for seting up MSI irqs.
> + * Based on driver/pci/msi.c: arch_setup_msi_irqs().
> + *
> + * Note:
> + * Current implementation assumes that all interrupt controller used in
> + * ARM64 architecture _MUST_ supports multi-MSI.
I think you can remove this comment, to be honest.
> + */
> +int arm64_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +{
Shouldn't this be called arch_setup_msi_irqs, since the intention is that
you override the weak symbol?
> + struct msi_desc *entry;
> + int ret;
> +
> + list_for_each_entry(entry, &dev->msi_list, list) {
> + ret = arch_setup_msi_irq(dev, entry);
> + if (ret < 0)
> + return ret;
> + if (ret > 0)
> + return -ENOSPC;
When does this function ever return a value > 0?
Will
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