Release 4.14 arch/arm64/kernel/acpi.c

/*
 *  ARM64 Specific Low-Level ACPI Boot Support
 *
 *  Copyright (C) 2013-2014, Linaro Ltd.
 *      Author: Al Stone <al.stone@linaro.org>
 *      Author: Graeme Gregory <graeme.gregory@linaro.org>
 *      Author: Hanjun Guo <hanjun.guo@linaro.org>
 *      Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
 *      Author: Naresh Bhat <naresh.bhat@linaro.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */


#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/cpumask.h>
#include <linux/efi-bgrt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/smp.h>
#include <linux/serial_core.h>

#include <asm/cputype.h>
#include <asm/cpu_ops.h>
#include <asm/smp_plat.h>

#ifdef CONFIG_ACPI_APEI
# include <linux/efi.h>
# include <asm/pgtable.h>
#endif


int acpi_noirq = 1;		
/* skip ACPI IRQ initialization */

int acpi_disabled = 1;

EXPORT_SYMBOL(acpi_disabled);


int acpi_pci_disabled = 1;	
/* skip ACPI PCI scan and IRQ initialization */

EXPORT_SYMBOL(acpi_pci_disabled);


static bool param_acpi_off __initdata;

static bool param_acpi_on __initdata;

static bool param_acpi_force __initdata;



static int __init parse_acpi(char *arg)
{
	if (!arg)
		return -EINVAL;

	/* "acpi=off" disables both ACPI table parsing and interpreter */
	if (strcmp(arg, "off") == 0)
		param_acpi_off = true;
	else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */
		param_acpi_on = true;
	else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
		param_acpi_force = true;
	else
		return -EINVAL;	/* Core will print when we return error */

	return 0;
}
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early_param("acpi", parse_acpi);



static int __init dt_scan_depth1_nodes(unsigned long node,
				       const char *uname, int depth,
				       void *data)
{
	/*
         * Ignore anything not directly under the root node; we'll
         * catch its parent instead.
         */
	if (depth != 1)
		return 0;

	if (strcmp(uname, "chosen") == 0)
		return 0;

	if (strcmp(uname, "hypervisor") == 0 &&
	    of_flat_dt_is_compatible(node, "xen,xen"))
		return 0;

	/*
         * This node at depth 1 is neither a chosen node nor a xen node,
         * which we do not expect.
         */
	return 1;
}

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/*
 * __acpi_map_table() will be called before page_init(), so early_ioremap()
 * or early_memremap() should be called here to for ACPI table mapping.
 */


void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
{
	if (!size)
		return NULL;

	return early_memremap(phys, size);
}

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void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
{
	if (!map || !size)
		return;

	early_memunmap(map, size);
}

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bool __init acpi_psci_present(void)
{
	return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
}

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/* Whether HVC must be used instead of SMC as the PSCI conduit */


bool __init acpi_psci_use_hvc(void)
{
	return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
}

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/*
 * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
 *                            checks on it
 *
 * Return 0 on success,  <0 on failure
 */


static int __init acpi_fadt_sanity_check(void)
{
	struct acpi_table_header *table;
	struct acpi_table_fadt *fadt;
	acpi_status status;
	int ret = 0;

	/*
         * FADT is required on arm64; retrieve it to check its presence
         * and carry out revision and ACPI HW reduced compliancy tests
         */
	status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
	if (ACPI_FAILURE(status)) {
		const char *msg = acpi_format_exception(status);

		pr_err("Failed to get FADT table, %s\n", msg);
		return -ENODEV;
	}

	fadt = (struct acpi_table_fadt *)table;

	/*
         * Revision in table header is the FADT Major revision, and there
         * is a minor revision of FADT which was introduced by ACPI 5.1,
         * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
         * boot protocol configuration data.
         */
	if (table->revision < 5 ||
	   (table->revision == 5 && fadt->minor_revision < 1)) {
		pr_err("Unsupported FADT revision %d.%d, should be 5.1+\n",
		       table->revision, fadt->minor_revision);
		ret = -EINVAL;
		goto out;
	}

	if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
		pr_err("FADT not ACPI hardware reduced compliant\n");
		ret = -EINVAL;
	}

out:
	/*
         * acpi_get_table() creates FADT table mapping that
         * should be released after parsing and before resuming boot
         */
	acpi_put_table(table);
	return ret;
}

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/*
 * acpi_boot_table_init() called from setup_arch(), always.
 *      1. find RSDP and get its address, and then find XSDT
 *      2. extract all tables and checksums them all
 *      3. check ACPI FADT revision
 *      4. check ACPI FADT HW reduced flag
 *
 * We can parse ACPI boot-time tables such as MADT after
 * this function is called.
 *
 * On return ACPI is enabled if either:
 *
 * - ACPI tables are initialized and sanity checks passed
 * - acpi=force was passed in the command line and ACPI was not disabled
 *   explicitly through acpi=off command line parameter
 *
 * ACPI is disabled on function return otherwise
 */


void __init acpi_boot_table_init(void)
{
	/*
         * Enable ACPI instead of device tree unless
         * - ACPI has been disabled explicitly (acpi=off), or
         * - the device tree is not empty (it has more than just a /chosen node,
         *   and a /hypervisor node when running on Xen)
         *   and ACPI has not been [force] enabled (acpi=on|force)
         */
	if (param_acpi_off ||
	    (!param_acpi_on && !param_acpi_force &&
	     of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
		goto done;

	/*
         * ACPI is disabled at this point. Enable it in order to parse
         * the ACPI tables and carry out sanity checks
         */
	enable_acpi();

	/*
         * If ACPI tables are initialized and FADT sanity checks passed,
         * leave ACPI enabled and carry on booting; otherwise disable ACPI
         * on initialization error.
         * If acpi=force was passed on the command line it forces ACPI
         * to be enabled even if its initialization failed.
         */
	if (acpi_table_init() || acpi_fadt_sanity_check()) {
		pr_err("Failed to init ACPI tables\n");
		if (!param_acpi_force)
			disable_acpi();
	}

done:
	if (acpi_disabled) {
		if (earlycon_init_is_deferred)
			early_init_dt_scan_chosen_stdout();
	} else {
		parse_spcr(earlycon_init_is_deferred);
		if (IS_ENABLED(CONFIG_ACPI_BGRT))
			acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);
	}
}

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#ifdef CONFIG_ACPI_APEI


pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
{
	/*
         * According to "Table 8 Map: EFI memory types to AArch64 memory
         * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
         * mapped to a corresponding MAIR attribute encoding.
         * The EFI memory attribute advises all possible capabilities
         * of a memory region. We use the most efficient capability.
         */

	u64 attr;

	attr = efi_mem_attributes(addr);
	if (attr & EFI_MEMORY_WB)
		return PAGE_KERNEL;
	if (attr & EFI_MEMORY_WT)
		return __pgprot(PROT_NORMAL_WT);
	if (attr & EFI_MEMORY_WC)
		return __pgprot(PROT_NORMAL_NC);
	return __pgprot(PROT_DEVICE_nGnRnE);
}
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#endif
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Directory: arch/arm64/kernel

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