Commit 22c03d7a authored by Junhao He's avatar Junhao He Committed by Zheng Zengkai
Browse files

arm64/trbe: Add initial MADT/SPE probing 

driver inclusion
category: featurn
bugzilla: https://gitee.com/openeuler/kernel/issues/I5YCYK



--------------------------------------------------------------------------

ACPI 6.5 adds additional fields to the MADT GICC
structure to describe TRBE PPI's. We pick these out
of the cached reference to the madt_gicc structure
similarly to the arm SPE code. We then create a platform
device referring to the IRQ and let the user/module loader
decide whether to load the TRBE driver.

Signed-off-by: default avatarJunhao He <hejunhao3@huawei.com>
Reviewed-by: default avatarXiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 40a4189f

arch/arm64/configs/openeuler_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -7299,6 +7299,7 @@ CONFIG_ETM4X_IMPDEF_FEATURE=y 
# CONFIG_CORESIGHT_CTI is not set

CONFIG_CORESIGHT_TRBE=m

CONFIG_ULTRASOC_SMB=m

CONFIG_ACPI_TRBE=y

# end of arm64 Debugging



#

arch/arm64/include/asm/acpi.h

+3 −0
Original line number Diff line number Diff line
@@ -42,6 +42,9 @@ 
#define ACPI_MADT_GICC_SPE  (offsetof(struct acpi_madt_generic_interrupt, \

	spe_interrupt) + sizeof(u16))



#define ACPI_MADT_GICC_TRBE  (offsetof(struct acpi_madt_generic_interrupt, \

	trbe_interrupt) + sizeof(u16))



/* Basic configuration for ACPI */

#ifdef	CONFIG_ACPI

pgprot_t __acpi_get_mem_attribute(phys_addr_t addr);

arch/arm64/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ obj-$(CONFIG_PCI) += pci.o 
obj-$(CONFIG_ARMV8_DEPRECATED)		+= armv8_deprecated.o

obj-$(CONFIG_ACPI)			+= acpi.o

obj-$(CONFIG_ACPI_NUMA)			+= acpi_numa.o

obj-$(CONFIG_ACPI_TRBE)			+= acpi_trbe.o

obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL)	+= acpi_parking_protocol.o

obj-$(CONFIG_PARAVIRT)			+= paravirt.o paravirt-spinlocks.o

obj-$(CONFIG_PARAVIRT_SPINLOCKS)	+= paravirt.o paravirt-spinlocks.o

arch/arm64/kernel/acpi_trbe.c

0 → 100644
+81 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * ACPI probing code for ARM Trace Buffer Extension.

 *

 * Copyright (C) 2022 ARM Ltd.

 */



#include <linux/acpi.h>

#include <linux/coresight.h>

#include <linux/platform_device.h>

#include <linux/init.h>



static struct resource trbe_resources[] = {

	{

		/* irq */

		.flags          = IORESOURCE_IRQ,

	}

};



static struct platform_device trbe_dev = {

	.name = ARMV9_TRBE_PDEV_NAME,

	.id = -1,

	.resource = trbe_resources,

	.num_resources = ARRAY_SIZE(trbe_resources)

};



static void arm_trbe_acpi_register_device(void)

{

	int cpu, hetid, irq, ret;

	bool first = true;

	u16 gsi = 0;



	/*

	 * Sanity check all the GICC tables for the same interrupt number.

	 * For now, we only support homogeneous machines.

	 */

	for_each_possible_cpu(cpu) {

		struct acpi_madt_generic_interrupt *gicc;



		gicc = acpi_cpu_get_madt_gicc(cpu);

		if (gicc->header.length < ACPI_MADT_GICC_TRBE)

			return;



		if (first) {

			gsi = gicc->trbe_interrupt;

			if (!gsi)

				return;

			hetid = find_acpi_cpu_topology_hetero_id(cpu);

			first = false;

		} else if ((gsi != gicc->trbe_interrupt) ||

				(hetid != find_acpi_cpu_topology_hetero_id(cpu))) {

			pr_warn("ACPI: TRBE must be homogeneous\n");

			return;

		}

	}



	irq = acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE,

			ACPI_ACTIVE_HIGH);

	if (irq < 0) {

		pr_warn("ACPI: TRBE Unable to register interrupt: %d\n", gsi);

		return;

	}



	trbe_resources[0].start = irq;

	ret = platform_device_register(&trbe_dev);

	if (ret < 0) {

		pr_warn("ACPI: TRBE: Unable to register device\n");

		acpi_unregister_gsi(gsi);

	}

}



static int arm_acpi_trbe_init(void)

{

	if (acpi_disabled)

		return 0;



	arm_trbe_acpi_register_device();



	return 0;

}

device_initcall(arm_acpi_trbe_init)

drivers/hwtracing/coresight/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -200,3 +200,7 @@ config ULTRASOC_SMB 
	  called ultrasoc-smb.



endif



config ACPI_TRBE

	depends on ARM64 && ACPI

	def_bool y