Re: [PATCH 2/2 V7] irqchip: gicv2m: Add supports for ARM GICv2m MSI(-X)
From: Marc Zyngier
Date: Fri Sep 19 2014 - 18:09:54 EST
Hi Suravee,
On Thu, Sep 18 2014 at 03:14:46 AM, "suravee.suthikulpanit@xxxxxxx" <suravee.suthikulpanit@xxxxxxx> wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>
> 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@xxxxxxx>
> Cc: Mark Rutland <Mark.Rutland@xxxxxxx>
> Cc: Marc Zyngier <Marc.Zyngier@xxxxxxx>
> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Cc: Catalin Marinas <Catalin.Marinas@xxxxxxx>
> Cc: Will Deacon <Will.Deacon@xxxxxxx>
> ---
> 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@e1101000 {
> + 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@0x8000 {
> + compatible = "arm,gic-v2m-frame";
> + msi-controller;
> + reg = <0x0 0x80000 0 0x1000>;
> + };
> +
> + ....
> +
> + v2mN: v2m@0x9000 {
> + 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@xxxxxxx>
> + * Harish Kasiviswanathan <harish.kasiviswanathan@xxxxxxx>
> + * Brandon Anderson <brandon.anderson@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.
> + */
> +
> +#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@xxxxxxx>
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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