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Date:	Fri, 19 Sep 2014 23:09:38 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	"suravee.suthikulpanit\@amd.com" <suravee.suthikulpanit@....com>
Cc:	Mark Rutland <Mark.Rutland@....com>,
	"jason\@lakedaemon.net" <jason@...edaemon.net>,
	Pawel Moll <Pawel.Moll@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"tglx\@linutronix.de" <tglx@...utronix.de>,
	"Harish.Kasiviswanathan\@amd.com" <Harish.Kasiviswanathan@....com>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pci\@vger.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc\@vger.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/2 V7] irqchip: gicv2m: Add supports for ARM GICv2m MSI(-X)

Hi Suravee,

On Thu, Sep 18 2014 at 03:14:46 AM, "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com> wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>
> ARM GICv2m specification extends GICv2 to support MSI(-X) with
> a new set of register frame. This patch introduces support for
> the non-secure GICv2m register frame. Currently, GICV2m is available
> in certain version of GIC-400.
>
> The patch introduces a new property in ARM gic binding, the v2m subnode.
> It is optional.
>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> Cc: Mark Rutland <Mark.Rutland@....com>
> Cc: Marc Zyngier <Marc.Zyngier@....com>
> Cc: Jason Cooper <jason@...edaemon.net>
> Cc: Catalin Marinas <Catalin.Marinas@....com>
> Cc: Will Deacon <Will.Deacon@....com>
> ---
>  Documentation/devicetree/bindings/arm/gic.txt |  55 ++++
>  arch/arm64/Kconfig                            |   1 +
>  drivers/irqchip/Kconfig                       |   7 +
>  drivers/irqchip/Makefile                      |   1 +
>  drivers/irqchip/irq-gic-common.c              |  12 +
>  drivers/irqchip/irq-gic-common.h              |   4 +
>  drivers/irqchip/irq-gic-v2m.c                 | 356 ++++++++++++++++++++++++++
>  drivers/irqchip/irq-gic.c                     |  82 +++---
>  drivers/irqchip/irq-gic.h                     |  54 ++++
>  9 files changed, 542 insertions(+), 30 deletions(-)
>  create mode 100644 drivers/irqchip/irq-gic-v2m.c
>  create mode 100644 drivers/irqchip/irq-gic.h
>
> diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt
> index c7d2fa1..38b2156 100644
> --- a/Documentation/devicetree/bindings/arm/gic.txt
> +++ b/Documentation/devicetree/bindings/arm/gic.txt
> @@ -96,3 +96,58 @@ Example:
>                       <0x2c006000 0x2000>;
>                 interrupts = <1 9 0xf04>;
>         };
> +
> +
> +* GICv2m extension for MSI/MSI-x support (Optional)
> +
> +Certain revision of GIC-400 supports MSI/MSI-x via V2M register frame.
> +This is enabled by specifying v2m sub-node.
> +
> +Required properties:
> +
> +- compatible        : The value here should be "arm,gic-v2m-frame".
> +
> +- msi-controller    : Identifies the node as an MSI controller.
> +
> +- reg               : GICv2m MSI interface register base and size
> +
> +Optional properties:
> +
> +- arm,msi-base-spi  : Specify base SPI the MSI frame.
> +                      The SPI base value can be from 32 to 1019.
> +
> +- arm,msi-num-spi   : Returns the number of contiguous SPIs assigned
> +                     to the frame.
> +
> +Note: "arm,msi-base-spi" and "arm,msi-num-spi" are used mainly for
> +       providing HW workaround in the case where the MSI_TYPER register
> +       is corrupted.
> +
> +Example:
> +
> +       interrupt-controller@...01000 {
> +               compatible = "arm,gic-400";
> +               #interrupt-cells = <3>;
> +               #address-cells = <2>;
> +               #size-cells = <2>;
> +               interrupt-controller;
> +               interrupts = <1 8 0xf04>;
> +               ranges = <0 0 0 0xe1100000 0 0x100000>;
> +               reg = <0x0 0xe1110000 0 0x01000>,
> +                     <0x0 0xe112f000 0 0x02000>,
> +                     <0x0 0xe1140000 0 0x10000>,
> +                     <0x0 0xe1160000 0 0x10000>;
> +               v2m0: v2m@...000 {
> +                       compatible = "arm,gic-v2m-frame";
> +                       msi-controller;
> +                       reg = <0x0 0x80000 0 0x1000>;
> +               };
> +
> +               ....
> +
> +               v2mN: v2m@...000 {
> +                       compatible = "arm,gic-v2m-frame";
> +                       msi-controller;
> +                       reg = <0x0 0x90000 0 0x1000>;
> +               };
> +       };
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index fd4e81a..83d5556 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -12,6 +12,7 @@ config ARM64
>         select ARM_ARCH_TIMER
>         select ARM_GIC
>         select AUDIT_ARCH_COMPAT_GENERIC
> +       select ARM_GIC_V2M
>         select ARM_GIC_V3
>         select BUILDTIME_EXTABLE_SORT
>         select CLONE_BACKWARDS
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index b8632bf..ddb31ee 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -7,6 +7,13 @@ config ARM_GIC
>         select IRQ_DOMAIN
>         select MULTI_IRQ_HANDLER
>
> +config ARM_GIC_V2M
> +       bool
> +       select IRQ_DOMAIN
> +       select MULTI_IRQ_HANDLER

These two selects are superfluous, as V2M already depend on ARM_GIC,
which selects them already.

> +       depends on ARM_GIC
> +       depends on PCI && PCI_MSI
> +
>  config GIC_NON_BANKED
>         bool
>
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 73052ba..3bda951 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_ARCH_SUNXI)              += irq-sun4i.o
>  obj-$(CONFIG_ARCH_SUNXI)               += irq-sunxi-nmi.o
>  obj-$(CONFIG_ARCH_SPEAR3XX)            += spear-shirq.o
>  obj-$(CONFIG_ARM_GIC)                  += irq-gic.o irq-gic-common.o
> +obj-$(CONFIG_ARM_GIC_V2M)              += irq-gic-v2m.o
>  obj-$(CONFIG_ARM_GIC_V3)               += irq-gic-v3.o irq-gic-common.o
>  obj-$(CONFIG_ARM_NVIC)                 += irq-nvic.o
>  obj-$(CONFIG_ARM_VIC)                  += irq-vic.o
> diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c
> index 60ac704..4b8cff2 100644
> --- a/drivers/irqchip/irq-gic-common.c
> +++ b/drivers/irqchip/irq-gic-common.c
> @@ -113,3 +113,15 @@ void gic_cpu_config(void __iomem *base, void (*sync_access)(void))
>         if (sync_access)
>                 sync_access();
>  }
> +
> +int gic_msi_get_vec_count(struct pci_dev *pdev, struct msi_desc *desc)
> +{
> +       int ret = -EINVAL;
> +#ifdef CONFIG_PCI_MSI
> +       if (desc->msi_attrib.is_msix)
> +               ret = pci_msix_vec_count(pdev);
> +       else
> +               ret = pci_msi_vec_count(pdev);
> +#endif
> +       return ret;
> +}

Eventually, I think this could becode core code. I'm not asking you do
move it now, but it would be good to keep it in mind.

> diff --git a/drivers/irqchip/irq-gic-common.h b/drivers/irqchip/irq-gic-common.h
> index b41f024..95049e5 100644
> --- a/drivers/irqchip/irq-gic-common.h
> +++ b/drivers/irqchip/irq-gic-common.h
> @@ -19,6 +19,8 @@
>
>  #include <linux/of.h>
>  #include <linux/irqdomain.h>
> +#include <linux/pci.h>
> +#include <linux/msi.h>
>
>  void gic_configure_irq(unsigned int irq, unsigned int type,
>                         void __iomem *base, void (*sync_access)(void));
> @@ -26,4 +28,6 @@ void gic_dist_config(void __iomem *base, int gic_irqs,
>                      void (*sync_access)(void));
>  void gic_cpu_config(void __iomem *base, void (*sync_access)(void));
>
> +int gic_msi_get_vec_count(struct pci_dev *pdev, struct msi_desc *desc);
> +
>  #endif /* _IRQ_GIC_COMMON_H */
> diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
> new file mode 100644
> index 0000000..1df5b37
> --- /dev/null
> +++ b/drivers/irqchip/irq-gic-v2m.c
> @@ -0,0 +1,356 @@
> +/*
> + * ARM GIC v2m MSI(-X) support
> + * Support for Message Signaled Interrupts for systems that
> + * implement ARM Generic Interrupt Controller: GICv2m.
> + *
> + * Copyright (C) 2014 Advanced Micro Devices, Inc.
> + * Authors: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> + *          Harish Kasiviswanathan <harish.kasiviswanathan@....com>
> + *          Brandon Anderson <brandon.anderson@....com>
> + *
> + * 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.
> + */
> +
> +#define pr_fmt(fmt) "GICv2m: " fmt
> +
> +#include <linux/bitmap.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_pci.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +
> +#include "irqchip.h"
> +#include "irq-gic.h"
> +#include "irq-gic-common.h"
> +
> +/*
> +* MSI_TYPER:
> +*     [31:26] Reserved
> +*     [25:16] lowest SPI assigned to MSI
> +*     [15:10] Reserved
> +*     [9:0]   Numer of SPIs assigned to MSI
> +*/
> +#define V2M_MSI_TYPER                  0x008
> +#define V2M_MSI_TYPER_BASE_SHIFT       16
> +#define V2M_MSI_TYPER_BASE_MASK                0x3FF
> +#define V2M_MSI_TYPER_NUM_MASK         0x3FF
> +#define V2M_MSI_SETSPI_NS              0x040
> +#define V2M_MIN_SPI                    32
> +#define V2M_MAX_SPI                    1019
> +
> +#define V2M_MSI_TYPER_BASE_SPI(x)      \
> +               ((x >> V2M_MSI_TYPER_BASE_SHIFT) & V2M_MSI_TYPER_BASE_MASK)
> +
> +#define V2M_MSI_TYPER_NUM_SPI(x)       (x & V2M_MSI_TYPER_NUM_MASK)

For safety, consider wrapping "x" around brackets.

> +
> +/*
> + * alloc_msi_irq - Allocate MSIs from available MSI bitmap.
> + * @data: Pointer to v2m_data
> + * @nvec: Number of interrupts to allocate
> + * @irq: Pointer to the allocated irq
> + *
> + * Allocates interrupts only if the contiguous range of MSIs
> + * with specified nvec are available. Otherwise return the number
> + * of available interrupts. If none are available, then returns -ENOENT.
> + */
> +static int alloc_msi_irq(struct v2m_data *data, int nvec, int *irq)
> +{
> +       int size = data->nr_spis;
> +       int next = size, i = nvec, ret;
> +
> +       /* We should never allocate more than available nr_spis */
> +       if (i >= size)
> +               i = size;
> +
> +       spin_lock(&data->msi_cnt_lock);
> +
> +       for (; i > 0; i--) {
> +               next = bitmap_find_next_zero_area(data->bm,
> +                                       size, 0, i, 0);
> +               if (next < size)
> +                       break;
> +       }
> +
> +       if (i != nvec) {
> +               ret = i ? : -ENOENT;
> +       } else {
> +               bitmap_set(data->bm, next, nvec);
> +               *irq = data->spi_start + next;
> +               ret = 0;
> +       }
> +
> +       spin_unlock(&data->msi_cnt_lock);
> +
> +       return ret;
> +}
> +
> +static void gicv2m_teardown_msi_irq(struct msi_chip *chip, unsigned int irq)
> +{
> +       int pos;
> +       struct v2m_data *data = container_of(chip, struct v2m_data, msi_chip);
> +
> +       spin_lock(&data->msi_cnt_lock);
> +
> +       pos = irq - data->spi_start;
> +       if (pos >= 0 && pos < data->nr_spis)
> +               bitmap_clear(data->bm, pos, 1);
> +
> +       spin_unlock(&data->msi_cnt_lock);
> +}
> +
> +bool gicv2m_check_msi_range(struct gic_chip_data *gic, irq_hw_number_t hw)
> +{
> +       struct v2m_data *v2m = NULL;
> +
> +       list_for_each_entry(v2m, &gic->v2m_list, list) {
> +               if (hw >= v2m->spi_start &&
> +                   hw <  v2m->spi_start + v2m->nr_spis)
> +                       return true;
> +       }
> +       return false;
> +}
> +
> +static int gicv2m_setup_msi_irq(struct msi_chip *chip,
> +                               struct pci_dev *pdev,
> +                               struct msi_desc *desc)
> +{
> +       int i, irq, nvec, avail;
> +       struct msi_msg msg;
> +       phys_addr_t addr;
> +       struct msi_desc *entry;
> +       struct v2m_data *data = container_of(chip, struct v2m_data, msi_chip);
> +
> +       if (!desc) {
> +               dev_err(&pdev->dev,
> +                       "MSI setup failed. Invalid msi descriptor\n");
> +               return -EINVAL;
> +       }
> +
> +       if (desc->msi_attrib.is_msix) {
> +               /**
> +                * For MSIx:
> +                * We allocate one irq at a time
> +                */
> +               avail = alloc_msi_irq(data, 1, &irq);
> +               if (avail != 0) {
> +                       dev_err(&pdev->dev,
> +                               "MSI setup failed. Cannnot allocate IRQ\n");
> +                       return -ENOSPC;
> +               }
> +
> +               irq_set_chip_data(irq, chip);
> +               irq_set_msi_desc(irq, desc);
> +               irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
> +       } else {
> +               /**
> +                * For MSI and Multi-MSI:
> +                * All requested irqs are allocated and setup at
> +                * once. Subsequent calls to this function would simply return
> +                * success. This is to avoid having to implement a separate
> +                * function for setting up multiple irqs.
> +                */
> +               BUG_ON(list_empty(&pdev->msi_list));
> +               WARN_ON(!list_is_singular(&pdev->msi_list));
> +
> +               nvec = gic_msi_get_vec_count(pdev, desc);
> +               if (WARN_ON(nvec <= 0))
> +                       return nvec;
> +
> +               entry = list_first_entry(&pdev->msi_list,
> +                                        struct msi_desc, list);
> +
> +               if ((nvec > 1) && (entry->msi_attrib.multiple))
> +                       return 0;
> +
> +               avail = alloc_msi_irq(data, nvec, &irq);
> +               if (avail != 0) {
> +                       dev_err(&pdev->dev,
> +                               "Failed to allocate %d irqs.\n", nvec);
> +                       return avail;
> +               }
> +
> +               if (nvec > 1) {
> +                       /* Set lowest of the new interrupts assigned
> +                        * to the PCI device
> +                        */
> +                       entry->nvec_used = nvec;
> +                       entry->msi_attrib.multiple = ilog2(
> +                                               __roundup_pow_of_two(nvec));
> +               }
> +
> +               for (i = 0; i < nvec; i++) {
> +                       irq_set_chip_data(irq+i, chip);
> +                       if (irq_set_msi_desc_off(irq, i, entry)) {
> +                               dev_err(&pdev->dev,
> +                                       "Failed to set up MSI irq %d\n",
> +                                       (irq+i));
> +                               return -EINVAL;
> +                       }
> +
> +                       irq_set_irq_type((irq+i), IRQ_TYPE_EDGE_RISING);
> +               }
> +       }
> +
> +       addr = data->res.start + V2M_MSI_SETSPI_NS;
> +       msg.address_hi = (u32)(addr >> 32);
> +       msg.address_lo = (u32)(addr);
> +       msg.data = irq;
> +       write_msi_msg(irq, &msg);
> +
> +       return 0;
> +}
> +
> +static void gicv2m_mask_irq(struct irq_data *d)
> +{
> +       gic_mask_irq(d);
> +       if (d->msi_desc)
> +               mask_msi_irq(d);
> +}
> +
> +static void gicv2m_unmask_irq(struct irq_data *d)
> +{
> +       gic_unmask_irq(d);
> +       if (d->msi_desc)
> +               unmask_msi_irq(d);
> +}
> +
> +static bool is_msi_spi_valid(u32 base, u32 num)
> +{
> +       if (base < V2M_MIN_SPI) {
> +               pr_err("Invalid MSI base SPI (base:%u)\n", base);
> +               return false;
> +       }
> +
> +       if ((num == 0) || (base + num > V2M_MAX_SPI)) {
> +               pr_err("Number of SPIs (%u) exceed maximum (%u)\n",
> +                      num, V2M_MAX_SPI - V2M_MIN_SPI + 1);
> +               return false;
> +       }
> +
> +       return true;
> +}
> +
> +static int __init
> +gicv2m_init_one(struct device_node *node, struct v2m_data **v,
> +               struct gic_chip_data *gic)
> +{
> +       int ret;
> +       struct v2m_data *v2m = NULL;
> +
> +       *v = kzalloc(sizeof(struct v2m_data), GFP_KERNEL);
> +       if (!*v) {
> +               pr_err("Failed to allocate struct v2m_data.\n");
> +               return -ENOMEM;
> +       }
> +
> +       v2m = *v;
> +       v2m->gic = gic;
> +       v2m->msi_chip.owner = THIS_MODULE;
> +       v2m->msi_chip.of_node = node;
> +       v2m->msi_chip.setup_irq = gicv2m_setup_msi_irq;
> +       v2m->msi_chip.teardown_irq = gicv2m_teardown_msi_irq;
> +       ret = of_address_to_resource(node, 0, &v2m->res);
> +       if (ret) {
> +               pr_err("Failed to allocate v2m resource.\n");
> +               goto err_out;
> +       }
> +
> +       v2m->base = ioremap(v2m->res.start, resource_size(&v2m->res));
> +       if (!v2m->base) {
> +               pr_err("Failed to map GICv2m resource\n");
> +               ret = -EINVAL;
> +               goto err_out;
> +       }
> +
> +       ret = of_pci_msi_chip_add(&v2m->msi_chip);
> +       if (ret) {
> +               pr_info("Failed to add msi_chip.\n");
> +               goto err_out;
> +       }
> +
> +       if (!of_property_read_u32(node, "arm,msi-base-spi", &v2m->spi_start) &&
> +           !of_property_read_u32(node, "arm,msi-num-spi", &v2m->nr_spis)) {
> +               pr_info("Overwriting V2M MSI_TYPER (base:%u, num:%u)\n",

Overriding instead of Overwriting?

> +                       v2m->spi_start, v2m->nr_spis);
> +       } else {
> +               u32 typer = readl_relaxed(v2m->base + V2M_MSI_TYPER);
> +
> +               v2m->spi_start = V2M_MSI_TYPER_BASE_SPI(typer);
> +               v2m->nr_spis = V2M_MSI_TYPER_NUM_SPI(typer);
> +       }
> +
> +       if (!is_msi_spi_valid(v2m->spi_start, v2m->nr_spis)) {
> +               ret = -EINVAL;
> +               goto err_out;
> +       }
> +
> +       v2m->bm = kzalloc(sizeof(long) * BITS_TO_LONGS(v2m->nr_spis),
> +                         GFP_KERNEL);
> +       if (!v2m->bm) {
> +               pr_err("Failed to allocate MSI bitmap\n");
> +               ret = -ENOMEM;
> +               goto err_out;
> +       }
> +
> +       spin_lock_init(&v2m->msi_cnt_lock);
> +
> +       pr_info(" Node %s: range[%#lx : %#lx], SPI[%d:%d]\n", node->name,
> +               (unsigned long)v2m->res.start, (unsigned long)v2m->res.end,
> +               v2m->spi_start, (v2m->spi_start + v2m->nr_spis));
> +
> +       return 0;
> +err_out:
> +       of_pci_msi_chip_remove(&v2m->msi_chip);
> +       if (v2m->base)
> +               iounmap(v2m->base);
> +       kfree(v2m);
> +       return ret;
> +}
> +
> +int __init gicv2m_of_init(struct device_node *node,
> +                         struct gic_chip_data *gic,
> +                         struct irq_chip *v2m_chip)
> +{
> +       int ret = 0;
> +       struct v2m_data *v2m;
> +       struct device_node *child = NULL;
> +
> +       INIT_LIST_HEAD(&gic->v2m_list);
> +
> +       v2m_chip->irq_mask = gicv2m_mask_irq;
> +       v2m_chip->irq_unmask = gicv2m_unmask_irq;
> +
> +       for (;;) {
> +               child = of_get_next_child(node, child);
> +               if (!child)
> +                       break;
> +
> +               if (!of_device_is_compatible(child, "arm,gic-v2m-frame"))
> +                       continue;
> +
> +               if (!of_find_property(child, "msi-controller", NULL))
> +                       continue;
> +
> +               ret = gicv2m_init_one(child, &v2m, gic);
> +               if (ret) {
> +                       of_node_put(node);
> +                       break;
> +               }
> +
> +               list_add_tail(&v2m->list, &gic->v2m_list);
> +       }
> +
> +       if (ret && list_empty(&gic->v2m_list)) {
> +               pr_warn("Warning: Failed to enable GICv2m support.\n");
> +               return -EINVAL;
> +       }
> +
> +       return ret;
> +}
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index 4b959e6..9f8e1e0 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -46,30 +46,9 @@
>  #include <asm/smp_plat.h>
>
>  #include "irq-gic-common.h"
> +#include "irq-gic.h"
>  #include "irqchip.h"
>
> -union gic_base {
> -       void __iomem *common_base;
> -       void __percpu * __iomem *percpu_base;
> -};
> -
> -struct gic_chip_data {
> -       union gic_base dist_base;
> -       union gic_base cpu_base;
> -#ifdef CONFIG_CPU_PM
> -       u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
> -       u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
> -       u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
> -       u32 __percpu *saved_ppi_enable;
> -       u32 __percpu *saved_ppi_conf;
> -#endif
> -       struct irq_domain *domain;
> -       unsigned int gic_irqs;
> -#ifdef CONFIG_GIC_NON_BANKED
> -       void __iomem *(*get_base)(union gic_base *);
> -#endif
> -};
> -
>  static DEFINE_RAW_SPINLOCK(irq_controller_lock);
>
>  /*
> @@ -131,15 +110,36 @@ static inline void gic_set_base_accessor(struct gic_chip_data *data,
>  #define gic_set_base_accessor(d, f)
>  #endif
>
> +static inline
> +struct gic_chip_data *irq_data_get_gic_chip_data(struct irq_data *d)
> +{
> +       struct gic_chip_data *gic_data;
> +       struct msi_chip *mchip;
> +       struct v2m_data *v2mdat;
> +
> +       /*
> +        * For MSI, irq_data.chip_data points to struct msi_chip.
> +        * For non-MSI, irq_data.chip_data points to struct gic_chip_data.
> +        */
> +       if (d->msi_desc) {
> +               mchip = irq_data_get_irq_chip_data(d);
> +               v2mdat = container_of(mchip, struct v2m_data, msi_chip);
> +               gic_data = v2mdat->gic;
> +       } else {
> +               gic_data = irq_data_get_irq_chip_data(d);
> +       }
> +       return gic_data;
> +}
> +
>  static inline void __iomem *gic_dist_base(struct irq_data *d)
>  {
> -       struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
> +       struct gic_chip_data *gic_data = irq_data_get_gic_chip_data(d);
>         return gic_data_dist_base(gic_data);
>  }
>
>  static inline void __iomem *gic_cpu_base(struct irq_data *d)
>  {
> -       struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
> +       struct gic_chip_data *gic_data = irq_data_get_gic_chip_data(d);
>         return gic_data_cpu_base(gic_data);
>  }
>
> @@ -151,7 +151,7 @@ static inline unsigned int gic_irq(struct irq_data *d)
>  /*
>   * Routines to acknowledge, disable and enable interrupts
>   */
> -static void gic_mask_irq(struct irq_data *d)
> +void gic_mask_irq(struct irq_data *d)
>  {
>         u32 mask = 1 << (gic_irq(d) % 32);
>
> @@ -162,7 +162,7 @@ static void gic_mask_irq(struct irq_data *d)
>         raw_spin_unlock(&irq_controller_lock);
>  }
>
> -static void gic_unmask_irq(struct irq_data *d)
> +void gic_unmask_irq(struct irq_data *d)
>  {
>         u32 mask = 1 << (gic_irq(d) % 32);
>
> @@ -325,6 +325,15 @@ static struct irq_chip gic_chip = {
>         .irq_set_wake           = gic_set_wake,
>  };
>
> +static struct irq_chip v2m_chip = {
> +       .name                   = "GICv2m",
> +       .irq_eoi                = gic_eoi_irq,
> +       .irq_set_type           = gic_set_type,
> +#ifdef CONFIG_SMP
> +       .irq_set_affinity       = gic_set_affinity,
> +#endif
> +};
> +
>  void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
>  {
>         if (gic_nr >= MAX_GIC_NR)
> @@ -767,19 +776,29 @@ void __init gic_init_physaddr(struct device_node *node)
>  static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
>                                 irq_hw_number_t hw)
>  {
> +       struct gic_chip_data *gic = d->host_data;
> +
> +       irq_set_chip_data(irq, gic);
> +
>         if (hw < 32) {
> +               /* PPIs */
>                 irq_set_percpu_devid(irq);
>                 irq_set_chip_and_handler(irq, &gic_chip,
>                                          handle_percpu_devid_irq);
>                 set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
>         } else {
> -               irq_set_chip_and_handler(irq, &gic_chip,
> -                                        handle_fasteoi_irq);
> +               /* SPIs */
>                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
>
> -               gic_routable_irq_domain_ops->map(d, irq, hw);
> +               if (!gicv2m_check_msi_range(gic, hw)) {
> +                       irq_set_chip_and_handler(irq, &gic_chip,
> +                                                handle_fasteoi_irq);
> +                       gic_routable_irq_domain_ops->map(d, irq, hw);
> +               } else {
> +                       irq_set_chip_and_handler(irq, &v2m_chip,
> +                                        handle_fasteoi_irq);
> +               }
>         }
> -       irq_set_chip_data(irq, d->host_data);
>         return 0;
>  }
>
> @@ -1010,6 +1029,9 @@ gic_of_init(struct device_node *node, struct device_node *parent)
>         if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
>                 percpu_offset = 0;
>
> +       if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
> +               gicv2m_of_init(node, &gic_data[gic_cnt], &v2m_chip);
> +
>         gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset, node);
>         if (!gic_cnt)
>                 gic_init_physaddr(node);
> diff --git a/drivers/irqchip/irq-gic.h b/drivers/irqchip/irq-gic.h
> new file mode 100644
> index 0000000..3021665
> --- /dev/null
> +++ b/drivers/irqchip/irq-gic.h
> @@ -0,0 +1,54 @@
> +#ifndef _IRQ_GIC_H_
> +#define _IRQ_GIC_H_
> +
> +#include <linux/msi.h>
> +#include <linux/pci.h>
> +
> +union gic_base {
> +       void __iomem *common_base;
> +       void __percpu * __iomem *percpu_base;
> +};
> +
> +struct gic_chip_data;
> +
> +struct v2m_data {
> +#ifdef CONFIG_ARM_GIC_V2M
> +       struct list_head list;
> +       spinlock_t msi_cnt_lock;
> +       struct msi_chip msi_chip;
> +       struct resource res;      /* GICv2m resource */
> +       void __iomem *base;       /* GICv2m virt address */
> +       unsigned int spi_start;   /* The SPI number that MSIs start */
> +       unsigned int nr_spis;     /* The number of SPIs for MSIs */
> +       unsigned long *bm;        /* MSI vector bitmap */
> +       struct gic_chip_data *gic;
> +#endif
> +};
> +
> +struct gic_chip_data {
> +       union gic_base dist_base;
> +       union gic_base cpu_base;
> +#ifdef CONFIG_CPU_PM
> +       u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
> +       u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
> +       u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
> +       u32 __percpu *saved_ppi_enable;
> +       u32 __percpu *saved_ppi_conf;
> +#endif
> +       struct irq_domain *domain;
> +       unsigned int gic_irqs;
> +#ifdef CONFIG_GIC_NON_BANKED
> +       void __iomem *(*get_base)(union gic_base *);
> +#endif
> +#ifdef CONFIG_ARM_GIC_V2M
> +       struct list_head v2m_list;
> +#endif
> +};
> +
> +void gic_mask_irq(struct irq_data *d);
> +void gic_unmask_irq(struct irq_data *d);
> +int gicv2m_of_init(struct device_node *node, struct gic_chip_data *gic,
> +                  struct irq_chip *v2m_chip) __init;
> +bool gicv2m_check_msi_range(struct gic_chip_data *gic, irq_hw_number_t hw);
> +
> +#endif /* _IRQ_GIC_H_ */
> --
> 1.9.3
>
>

If you fix the couple of nits I mentionned above, please add my

Acked-by: Marc Zyngier <marc.zyngier@....com>

In other news, I think this would be quite a match for the hierarchical
irq_domain work that is ongoing. I'm looking at adapting this driver to
this framework, and I hope this would simplify the mask/unmask stuff, as
well as the whole irq_data_get_gic_chip_data(). Again, I'm not asking
you to do that, this is just so people know I'm looking at it.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny.
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