Commit e77b8dc0 authored by Sunil V L's avatar Sunil V L Committed by Rafael J. Wysocki
Browse files

ACPI: RISC-V: Initialize GSI mapping structures 



RISC-V has PLIC and APLIC in MADT as well as namespace devices.
Initialize the list of those structures using MADT and namespace devices
to create mapping between the ACPI handle and the GSI ranges. This will
be used later to add dependencies.

Signed-off-by: default avatarSunil V L <sunilvl@ventanamicro.com>
Tested-by: default avatarBjörn Töpel <bjorn@rivosinc.com>
Link: https://patch.msgid.link/20240812005929.113499-12-sunilvl@ventanamicro.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent f8bba143

arch/riscv/include/asm/irq.h

+22 −0
Original line number Diff line number Diff line
@@ -16,4 +16,26 @@ void riscv_set_intc_hwnode_fn(struct fwnode_handle *(*fn)(void)); 


struct fwnode_handle *riscv_get_intc_hwnode(void);



#ifdef CONFIG_ACPI



enum riscv_irqchip_type {

	ACPI_RISCV_IRQCHIP_INTC		= 0x00,

	ACPI_RISCV_IRQCHIP_IMSIC	= 0x01,

	ACPI_RISCV_IRQCHIP_PLIC		= 0x02,

	ACPI_RISCV_IRQCHIP_APLIC	= 0x03,

};



int riscv_acpi_get_gsi_info(struct fwnode_handle *fwnode, u32 *gsi_base,

			    u32 *id, u32 *nr_irqs, u32 *nr_idcs);

struct fwnode_handle *riscv_acpi_get_gsi_domain_id(u32 gsi);



#else

static inline int riscv_acpi_get_gsi_info(struct fwnode_handle *fwnode, u32 *gsi_base,

					  u32 *id, u32 *nr_irqs, u32 *nr_idcs)

{

	return 0;

}



#endif /* CONFIG_ACPI */



#endif /* _ASM_RISCV_IRQ_H */

drivers/acpi/riscv/init.c

+2 −0
Original line number Diff line number Diff line
@@ -5,7 +5,9 @@ 
 */



#include <linux/acpi.h>

#include "init.h"



void __init acpi_riscv_init(void)

{

	riscv_acpi_init_gsi_mapping();

}

drivers/acpi/riscv/init.h

0 → 100644
+4 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

#include <linux/init.h>



void __init riscv_acpi_init_gsi_mapping(void);

drivers/acpi/riscv/irq.c

+147 −0
Original line number Diff line number Diff line
@@ -6,6 +6,21 @@ 


#include <linux/acpi.h>

#include <linux/sort.h>

#include <linux/irq.h>



#include "init.h"



struct riscv_ext_intc_list {

	acpi_handle		handle;

	u32			gsi_base;

	u32			nr_irqs;

	u32			nr_idcs;

	u32			id;

	u32			type;

	struct list_head	list;

};



LIST_HEAD(ext_intc_list);



static int irqchip_cmp_func(const void *in0, const void *in1)

{
@@ -31,3 +46,135 @@ void arch_sort_irqchip_probe(struct acpi_probe_entry *ap_head, int nr) 
		return;

	sort(ape, nr, sizeof(*ape), irqchip_cmp_func, NULL);

}



static acpi_status riscv_acpi_update_gsi_handle(u32 gsi_base, acpi_handle handle)

{

	struct riscv_ext_intc_list *ext_intc_element;

	struct list_head *i, *tmp;



	list_for_each_safe(i, tmp, &ext_intc_list) {

		ext_intc_element = list_entry(i, struct riscv_ext_intc_list, list);

		if (gsi_base == ext_intc_element->gsi_base) {

			ext_intc_element->handle = handle;

			return AE_OK;

		}

	}



	return AE_NOT_FOUND;

}



int riscv_acpi_get_gsi_info(struct fwnode_handle *fwnode, u32 *gsi_base,

			    u32 *id, u32 *nr_irqs, u32 *nr_idcs)

{

	struct riscv_ext_intc_list *ext_intc_element;

	struct list_head *i;



	list_for_each(i, &ext_intc_list) {

		ext_intc_element = list_entry(i, struct riscv_ext_intc_list, list);

		if (ext_intc_element->handle == ACPI_HANDLE_FWNODE(fwnode)) {

			*gsi_base = ext_intc_element->gsi_base;

			*id = ext_intc_element->id;

			*nr_irqs = ext_intc_element->nr_irqs;

			if (nr_idcs)

				*nr_idcs = ext_intc_element->nr_idcs;



			return 0;

		}

	}



	return -ENODEV;

}



struct fwnode_handle *riscv_acpi_get_gsi_domain_id(u32 gsi)

{

	struct riscv_ext_intc_list *ext_intc_element;

	struct acpi_device *adev;

	struct list_head *i;



	list_for_each(i, &ext_intc_list) {

		ext_intc_element = list_entry(i, struct riscv_ext_intc_list, list);

		if (gsi >= ext_intc_element->gsi_base &&

		    gsi < (ext_intc_element->gsi_base + ext_intc_element->nr_irqs)) {

			adev = acpi_fetch_acpi_dev(ext_intc_element->handle);

			if (!adev)

				return NULL;



			return acpi_fwnode_handle(adev);

		}

	}



	return NULL;

}



static int __init riscv_acpi_register_ext_intc(u32 gsi_base, u32 nr_irqs, u32 nr_idcs,

					       u32 id, u32 type)

{

	struct riscv_ext_intc_list *ext_intc_element;



	ext_intc_element = kzalloc(sizeof(*ext_intc_element), GFP_KERNEL);

	if (!ext_intc_element)

		return -ENOMEM;



	ext_intc_element->gsi_base = gsi_base;

	ext_intc_element->nr_irqs = nr_irqs;

	ext_intc_element->nr_idcs = nr_idcs;

	ext_intc_element->id = id;

	list_add_tail(&ext_intc_element->list, &ext_intc_list);

	return 0;

}



static acpi_status __init riscv_acpi_create_gsi_map(acpi_handle handle, u32 level,

						    void *context, void **return_value)

{

	acpi_status status;

	u64 gbase;



	if (!acpi_has_method(handle, "_GSB")) {

		acpi_handle_err(handle, "_GSB method not found\n");

		return AE_ERROR;

	}



	status = acpi_evaluate_integer(handle, "_GSB", NULL, &gbase);

	if (ACPI_FAILURE(status)) {

		acpi_handle_err(handle, "failed to evaluate _GSB method\n");

		return status;

	}



	status = riscv_acpi_update_gsi_handle((u32)gbase, handle);

	if (ACPI_FAILURE(status)) {

		acpi_handle_err(handle, "failed to find the GSI mapping entry\n");

		return status;

	}



	return AE_OK;

}



static int __init riscv_acpi_aplic_parse_madt(union acpi_subtable_headers *header,

					      const unsigned long end)

{

	struct acpi_madt_aplic *aplic = (struct acpi_madt_aplic *)header;



	return riscv_acpi_register_ext_intc(aplic->gsi_base, aplic->num_sources, aplic->num_idcs,

					    aplic->id, ACPI_RISCV_IRQCHIP_APLIC);

}



static int __init riscv_acpi_plic_parse_madt(union acpi_subtable_headers *header,

					     const unsigned long end)

{

	struct acpi_madt_plic *plic = (struct acpi_madt_plic *)header;



	return riscv_acpi_register_ext_intc(plic->gsi_base, plic->num_irqs, 0,

					    plic->id, ACPI_RISCV_IRQCHIP_PLIC);

}



void __init riscv_acpi_init_gsi_mapping(void)

{

	/* There can be either PLIC or APLIC */

	if (acpi_table_parse_madt(ACPI_MADT_TYPE_PLIC, riscv_acpi_plic_parse_madt, 0) > 0) {

		acpi_get_devices("RSCV0001", riscv_acpi_create_gsi_map, NULL, NULL);

		return;

	}



	if (acpi_table_parse_madt(ACPI_MADT_TYPE_APLIC, riscv_acpi_aplic_parse_madt, 0) > 0)

		acpi_get_devices("RSCV0002", riscv_acpi_create_gsi_map, NULL, NULL);

}