linux-kernel - Re: [PATCH v14 12/18] irqchip/riscv-imsic: Add device MSI domain support for platform devices

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Message-ID: <87jzmwtzbs.fsf@all.your.base.are.belong.to.us>
Date: Thu, 22 Feb 2024 14:15:19 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Anup Patel <apatel@...tanamicro.com>, Palmer Dabbelt
 <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>, Thomas
 Gleixner <tglx@...utronix.de>, Rob Herring <robh+dt@...nel.org>, Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Frank Rowand
 <frowand.list@...il.com>, Conor Dooley <conor+dt@...nel.org>
Cc: Anup Patel <apatel@...tanamicro.com>, devicetree@...r.kernel.org,
 Saravana Kannan <saravanak@...gle.com>, Marc Zyngier <maz@...nel.org>,
 Anup Patel <anup@...infault.org>, linux-kernel@...r.kernel.org, Atish
 Patra <atishp@...shpatra.org>, linux-riscv@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, Andrew Jones
 <ajones@...tanamicro.com>
Subject: Re: [PATCH v14 12/18] irqchip/riscv-imsic: Add device MSI domain
 support for platform devices

Anup Patel <apatel@...tanamicro.com> writes:

> The Linux platform MSI support allows per-device MSI domains so add
> a platform irqchip driver for RISC-V IMSIC which provides a base IRQ
> domain with MSI parent support for platform device domains.
>
> The IMSIC platform driver assumes that the IMSIC state is already
> initialized by the IMSIC early driver.
>
> Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> ---
>  drivers/irqchip/Makefile                   |   2 +-
>  drivers/irqchip/irq-riscv-imsic-platform.c | 344 +++++++++++++++++++++
>  drivers/irqchip/irq-riscv-imsic-state.h    |   1 +
>  3 files changed, 346 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/irqchip/irq-riscv-imsic-platform.c
>
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index d714724387ce..abca445a3229 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -95,7 +95,7 @@ obj-$(CONFIG_QCOM_MPM)			+= irq-qcom-mpm.o
>  obj-$(CONFIG_CSKY_MPINTC)		+= irq-csky-mpintc.o
>  obj-$(CONFIG_CSKY_APB_INTC)		+= irq-csky-apb-intc.o
>  obj-$(CONFIG_RISCV_INTC)		+= irq-riscv-intc.o
> -obj-$(CONFIG_RISCV_IMSIC)		+= irq-riscv-imsic-state.o irq-riscv-imsic-early.o
> +obj-$(CONFIG_RISCV_IMSIC)		+= irq-riscv-imsic-state.o irq-riscv-imsic-early.o irq-riscv-imsic-platform.o
>  obj-$(CONFIG_SIFIVE_PLIC)		+= irq-sifive-plic.o
>  obj-$(CONFIG_IMX_IRQSTEER)		+= irq-imx-irqsteer.o
>  obj-$(CONFIG_IMX_INTMUX)		+= irq-imx-intmux.o
> diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
> new file mode 100644
> index 000000000000..e2344fc08dca
> --- /dev/null
> +++ b/drivers/irqchip/irq-riscv-imsic-platform.c
> @@ -0,0 +1,344 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2021 Western Digital Corporation or its affiliates.
> + * Copyright (C) 2022 Ventana Micro Systems Inc.
> + */
> +
> +#define pr_fmt(fmt) "riscv-imsic: " fmt
> +#include <linux/bitmap.h>
> +#include <linux/cpu.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/irq.h>
> +#include <linux/irqchip.h>
> +#include <linux/irqdomain.h>
> +#include <linux/module.h>
> +#include <linux/msi.h>
> +#include <linux/platform_device.h>
> +#include <linux/spinlock.h>
> +#include <linux/smp.h>
> +
> +#include "irq-riscv-imsic-state.h"
> +
> +static bool imsic_cpu_page_phys(unsigned int cpu, unsigned int guest_index,
> +				phys_addr_t *out_msi_pa)
> +{
> +	struct imsic_global_config *global;
> +	struct imsic_local_config *local;
> +
> +	global = &imsic->global;
> +	local = per_cpu_ptr(global->local, cpu);
> +
> +	if (BIT(global->guest_index_bits) <= guest_index)
> +		return false;
> +
> +	if (out_msi_pa)
> +		*out_msi_pa = local->msi_pa +
> +			      (guest_index * IMSIC_MMIO_PAGE_SZ);

Nit: And one more redundant parenthesis and 100 char! ;-)


Björn