Anup Patel <apatel@xxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxx> > --- > 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