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Wysocki" , Mika Westerberg , Andy Shevchenko , Linus Walleij , Bartosz Golaszewski , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Cc: Palmer Dabbelt , Paul Walmsley , Len Brown , Sunil V L , Rahul Pathak , Leyfoon Tan , Atish Patra , Andrew Jones , Samuel Holland , Anup Patel , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v5 12/23] irqchip: Add driver for the RPMI system MSI service group Date: Wed, 11 Jun 2025 11:52:27 +0530 Message-ID: <20250611062238.636753-13-apatel@ventanamicro.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250611062238.636753-1-apatel@ventanamicro.com> References: <20250611062238.636753-1-apatel@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The RPMI specification defines a system MSI service group which allows application processors to receive MSIs upon system events such as graceful shutdown/reboot request, CPU hotplug event, memory hotplug event, etc. Add an irqchip driver for the RISC-V RPMI system MSI service group to directly receive system MSIs in Linux kernel. Signed-off-by: Anup Patel Reviewed-by: Thomas Gleixner --- drivers/irqchip/Kconfig | 7 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-riscv-rpmi-sysmsi.c | 285 +++++++++++++++++++++ include/linux/mailbox/riscv-rpmi-message.h | 13 + 4 files changed, 306 insertions(+) create mode 100644 drivers/irqchip/irq-riscv-rpmi-sysmsi.c diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 0d196e447142..96bf6aa55681 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -617,6 +617,13 @@ config RISCV_IMSIC select GENERIC_MSI_IRQ select IRQ_MSI_LIB =20 +config RISCV_RPMI_SYSMSI + bool + depends on MAILBOX + select IRQ_DOMAIN_HIERARCHY + select GENERIC_MSI_IRQ + default RISCV + config SIFIVE_PLIC bool depends on RISCV diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 23ca4959e6ce..4fd966aa78ab 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -103,6 +103,7 @@ obj-$(CONFIG_RISCV_INTC) +=3D irq-riscv-intc.o obj-$(CONFIG_RISCV_APLIC) +=3D irq-riscv-aplic-main.o irq-riscv-aplic-dir= ect.o obj-$(CONFIG_RISCV_APLIC_MSI) +=3D irq-riscv-aplic-msi.o obj-$(CONFIG_RISCV_IMSIC) +=3D irq-riscv-imsic-state.o irq-riscv-imsic-ea= rly.o irq-riscv-imsic-platform.o +obj-$(CONFIG_RISCV_RPMI_SYSMSI) +=3D irq-riscv-rpmi-sysmsi.o obj-$(CONFIG_SIFIVE_PLIC) +=3D irq-sifive-plic.o obj-$(CONFIG_STARFIVE_JH8100_INTC) +=3D irq-starfive-jh8100-intc.o obj-$(CONFIG_THEAD_C900_ACLINT_SSWI) +=3D irq-thead-c900-aclint-sswi.o diff --git a/drivers/irqchip/irq-riscv-rpmi-sysmsi.c b/drivers/irqchip/irq-= riscv-rpmi-sysmsi.c new file mode 100644 index 000000000000..06f64936802a --- /dev/null +++ b/drivers/irqchip/irq-riscv-rpmi-sysmsi.c @@ -0,0 +1,285 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2025 Ventana Micro Systems Inc. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct rpmi_sysmsi_get_attrs_rx { + __le32 status; + __le32 sys_num_msi; + __le32 flag0; + __le32 flag1; +}; + +#define RPMI_SYSMSI_MSI_ATTRIBUTES_FLAG0_PREF_PRIV BIT(0) + +struct rpmi_sysmsi_set_msi_state_tx { + __le32 sys_msi_index; + __le32 sys_msi_state; +}; + +struct rpmi_sysmsi_set_msi_state_rx { + __le32 status; +}; + +#define RPMI_SYSMSI_MSI_STATE_ENABLE BIT(0) +#define RPMI_SYSMSI_MSI_STATE_PENDING BIT(1) + +struct rpmi_sysmsi_set_msi_target_tx { + __le32 sys_msi_index; + __le32 sys_msi_address_low; + __le32 sys_msi_address_high; + __le32 sys_msi_data; +}; + +struct rpmi_sysmsi_set_msi_target_rx { + __le32 status; +}; + +struct rpmi_sysmsi_priv { + struct device *dev; + struct mbox_client client; + struct mbox_chan *chan; + u32 nr_irqs; + u32 gsi_base; +}; + +static int rpmi_sysmsi_get_num_msi(struct rpmi_sysmsi_priv *priv) +{ + struct rpmi_sysmsi_get_attrs_rx rx; + struct rpmi_mbox_message msg; + int ret; + + rpmi_mbox_init_send_with_response(&msg, RPMI_SYSMSI_SRV_GET_ATTRIBUTES, + NULL, 0, &rx, sizeof(rx)); + ret =3D rpmi_mbox_send_message(priv->chan, &msg); + if (ret) + return ret; + if (rx.status) + return rpmi_to_linux_error(le32_to_cpu(rx.status)); + + return le32_to_cpu(rx.sys_num_msi); +} + +static int rpmi_sysmsi_set_msi_state(struct rpmi_sysmsi_priv *priv, + u32 sys_msi_index, u32 sys_msi_state) +{ + struct rpmi_sysmsi_set_msi_state_tx tx; + struct rpmi_sysmsi_set_msi_state_rx rx; + struct rpmi_mbox_message msg; + int ret; + + tx.sys_msi_index =3D cpu_to_le32(sys_msi_index); + tx.sys_msi_state =3D cpu_to_le32(sys_msi_state); + rpmi_mbox_init_send_with_response(&msg, RPMI_SYSMSI_SRV_SET_MSI_STATE, + &tx, sizeof(tx), &rx, sizeof(rx)); + ret =3D rpmi_mbox_send_message(priv->chan, &msg); + if (ret) + return ret; + if (rx.status) + return rpmi_to_linux_error(le32_to_cpu(rx.status)); + + return 0; +} + +static int rpmi_sysmsi_set_msi_target(struct rpmi_sysmsi_priv *priv, + u32 sys_msi_index, struct msi_msg *m) +{ + struct rpmi_sysmsi_set_msi_target_tx tx; + struct rpmi_sysmsi_set_msi_target_rx rx; + struct rpmi_mbox_message msg; + int ret; + + tx.sys_msi_index =3D cpu_to_le32(sys_msi_index); + tx.sys_msi_address_low =3D cpu_to_le32(m->address_lo); + tx.sys_msi_address_high =3D cpu_to_le32(m->address_hi); + tx.sys_msi_data =3D cpu_to_le32(m->data); + rpmi_mbox_init_send_with_response(&msg, RPMI_SYSMSI_SRV_SET_MSI_TARGET, + &tx, sizeof(tx), &rx, sizeof(rx)); + ret =3D rpmi_mbox_send_message(priv->chan, &msg); + if (ret) + return ret; + if (rx.status) + return rpmi_to_linux_error(le32_to_cpu(rx.status)); + + return 0; +} + +static void rpmi_sysmsi_irq_mask(struct irq_data *d) +{ + struct rpmi_sysmsi_priv *priv =3D irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq =3D irqd_to_hwirq(d); + int ret; + + ret =3D rpmi_sysmsi_set_msi_state(priv, hwirq, 0); + if (ret) + dev_warn(priv->dev, "Failed to mask hwirq %lu (error %d)\n", hwirq, ret); + irq_chip_mask_parent(d); +} + +static void rpmi_sysmsi_irq_unmask(struct irq_data *d) +{ + struct rpmi_sysmsi_priv *priv =3D irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq =3D irqd_to_hwirq(d); + int ret; + + irq_chip_unmask_parent(d); + ret =3D rpmi_sysmsi_set_msi_state(priv, hwirq, RPMI_SYSMSI_MSI_STATE_ENAB= LE); + if (ret) + dev_warn(priv->dev, "Failed to unmask hwirq %lu (error %d)\n", hwirq, re= t); +} + +static void rpmi_sysmsi_write_msg(struct irq_data *d, struct msi_msg *msg) +{ + struct rpmi_sysmsi_priv *priv =3D irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq =3D irqd_to_hwirq(d); + int ret; + + /* For zeroed MSI, do nothing as of now */ + if (!msg->address_hi && !msg->address_lo && !msg->data) + return; + + ret =3D rpmi_sysmsi_set_msi_target(priv, hwirq, msg); + if (ret) { + dev_warn(priv->dev, "Failed to set target for hwirq %lu (error %d)\n", + hwirq, ret); + } +} + +static void rpmi_sysmsi_set_desc(msi_alloc_info_t *arg, struct msi_desc *d= esc) +{ + arg->desc =3D desc; + arg->hwirq =3D desc->data.icookie.value; +} + +static int rpmi_sysmsi_translate(struct irq_domain *d, struct irq_fwspec *= fwspec, + unsigned long *hwirq, unsigned int *type) +{ + struct msi_domain_info *info =3D d->host_data; + struct rpmi_sysmsi_priv *priv =3D info->data; + + if (WARN_ON(fwspec->param_count < 1)) + return -EINVAL; + + /* For DT, gsi_base is always zero. */ + *hwirq =3D fwspec->param[0] - priv->gsi_base; + *type =3D IRQ_TYPE_NONE; + return 0; +} + +static const struct msi_domain_template rpmi_sysmsi_template =3D { + .chip =3D { + .name =3D "RPMI-SYSMSI", + .irq_mask =3D rpmi_sysmsi_irq_mask, + .irq_unmask =3D rpmi_sysmsi_irq_unmask, +#ifdef CONFIG_SMP + .irq_set_affinity =3D irq_chip_set_affinity_parent, +#endif + .irq_write_msi_msg =3D rpmi_sysmsi_write_msg, + .flags =3D IRQCHIP_SET_TYPE_MASKED | + IRQCHIP_SKIP_SET_WAKE | + IRQCHIP_MASK_ON_SUSPEND, + }, + + .ops =3D { + .set_desc =3D rpmi_sysmsi_set_desc, + .msi_translate =3D rpmi_sysmsi_translate, + }, + + .info =3D { + .bus_token =3D DOMAIN_BUS_WIRED_TO_MSI, + .flags =3D MSI_FLAG_USE_DEV_FWNODE, + .handler =3D handle_simple_irq, + .handler_name =3D "simple", + }, +}; + +static int rpmi_sysmsi_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct rpmi_sysmsi_priv *priv; + int rc; + + priv =3D devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->dev =3D dev; + + /* Setup mailbox client */ + priv->client.dev =3D priv->dev; + priv->client.rx_callback =3D NULL; + priv->client.tx_block =3D false; + priv->client.knows_txdone =3D true; + priv->client.tx_tout =3D 0; + + /* Request mailbox channel */ + priv->chan =3D mbox_request_channel(&priv->client, 0); + if (IS_ERR(priv->chan)) + return PTR_ERR(priv->chan); + + /* Get number of system MSIs */ + rc =3D rpmi_sysmsi_get_num_msi(priv); + if (rc < 1) { + mbox_free_channel(priv->chan); + if (rc) + return dev_err_probe(dev, rc, "Failed to get number of system MSIs\n"); + else + return dev_err_probe(dev, -ENODEV, "No system MSIs found\n"); + } + priv->nr_irqs =3D rc; + + /* Set the device MSI domain if not available */ + if (!dev_get_msi_domain(dev)) { + /* + * The device MSI domain for OF devices is only set at the + * time of populating/creating OF device. If the device MSI + * domain is discovered later after the OF device is created + * then we need to set it explicitly before using any platform + * MSI functions. + */ + if (dev_of_node(dev)) + of_msi_configure(dev, dev_of_node(dev)); + + if (!dev_get_msi_domain(dev)) { + mbox_free_channel(priv->chan); + return -EPROBE_DEFER; + } + } + + if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN, + &rpmi_sysmsi_template, + priv->nr_irqs, priv, priv)) { + mbox_free_channel(priv->chan); + return dev_err_probe(dev, -ENOMEM, "failed to create MSI irq domain\n"); + } + + dev_info(dev, "%u system MSIs registered\n", priv->nr_irqs); + return 0; +} + +static const struct of_device_id rpmi_sysmsi_match[] =3D { + { .compatible =3D "riscv,rpmi-system-msi" }, + {} +}; + +static struct platform_driver rpmi_sysmsi_driver =3D { + .driver =3D { + .name =3D "rpmi-sysmsi", + .of_match_table =3D rpmi_sysmsi_match, + }, + .probe =3D rpmi_sysmsi_probe, +}; +builtin_platform_driver(rpmi_sysmsi_driver); diff --git a/include/linux/mailbox/riscv-rpmi-message.h b/include/linux/mai= lbox/riscv-rpmi-message.h index 476a2d64d972..06d2f8b38969 100644 --- a/include/linux/mailbox/riscv-rpmi-message.h +++ b/include/linux/mailbox/riscv-rpmi-message.h @@ -91,6 +91,7 @@ static inline int rpmi_to_linux_error(int rpmi_error) } =20 /* RPMI service group IDs */ +#define RPMI_SRVGRP_SYSTEM_MSI 0x00002 #define RPMI_SRVGRP_CLOCK 0x00008 =20 /* RPMI clock service IDs */ @@ -106,6 +107,18 @@ enum rpmi_clock_service_id { RPMI_CLK_SRV_ID_MAX_COUNT }; =20 +/* RPMI system MSI service IDs */ +enum rpmi_sysmsi_service_id { + RPMI_SYSMSI_SRV_ENABLE_NOTIFICATION =3D 0x01, + RPMI_SYSMSI_SRV_GET_ATTRIBUTES =3D 0x02, + RPMI_SYSMSI_SRV_GET_MSI_ATTRIBUTES =3D 0x03, + RPMI_SYSMSI_SRV_SET_MSI_STATE =3D 0x04, + RPMI_SYSMSI_SRV_GET_MSI_STATE =3D 0x05, + RPMI_SYSMSI_SRV_SET_MSI_TARGET =3D 0x06, + RPMI_SYSMSI_SRV_GET_MSI_TARGET =3D 0x07, + RPMI_SYSMSI_SRV_ID_MAX_COUNT +}; + /* RPMI Linux mailbox attribute IDs */ enum rpmi_mbox_attribute_id { RPMI_MBOX_ATTR_SPEC_VERSION, --=20 2.43.0