e8065df5b0
Enhance the acpi_os_ioremap() to support opregions in MMIO space. Also, have strict checks using EFI memory map to allow remapping the RAM similar to arm64. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Acked-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20231018124007.1306159-2-sunilvl@ventanamicro.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
335 lines
9.0 KiB
C
335 lines
9.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* RISC-V Specific Low-Level ACPI Boot Support
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*
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* Copyright (C) 2013-2014, Linaro Ltd.
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* Author: Al Stone <al.stone@linaro.org>
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* Author: Graeme Gregory <graeme.gregory@linaro.org>
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* Author: Hanjun Guo <hanjun.guo@linaro.org>
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* Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
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* Author: Naresh Bhat <naresh.bhat@linaro.org>
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*
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* Copyright (C) 2021-2023, Ventana Micro Systems Inc.
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* Author: Sunil V L <sunilvl@ventanamicro.com>
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*/
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#include <linux/acpi.h>
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#include <linux/efi.h>
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#include <linux/io.h>
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#include <linux/memblock.h>
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#include <linux/pci.h>
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int acpi_noirq = 1; /* skip ACPI IRQ initialization */
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int acpi_disabled = 1;
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EXPORT_SYMBOL(acpi_disabled);
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int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
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EXPORT_SYMBOL(acpi_pci_disabled);
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static bool param_acpi_off __initdata;
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static bool param_acpi_on __initdata;
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static bool param_acpi_force __initdata;
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static struct acpi_madt_rintc cpu_madt_rintc[NR_CPUS];
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static int __init parse_acpi(char *arg)
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{
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if (!arg)
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return -EINVAL;
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/* "acpi=off" disables both ACPI table parsing and interpreter */
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if (strcmp(arg, "off") == 0)
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param_acpi_off = true;
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else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */
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param_acpi_on = true;
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else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
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param_acpi_force = true;
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else
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return -EINVAL; /* Core will print when we return error */
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return 0;
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}
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early_param("acpi", parse_acpi);
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/*
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* acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
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* checks on it
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*
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* Return 0 on success, <0 on failure
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*/
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static int __init acpi_fadt_sanity_check(void)
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{
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struct acpi_table_header *table;
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struct acpi_table_fadt *fadt;
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acpi_status status;
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int ret = 0;
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/*
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* FADT is required on riscv; retrieve it to check its presence
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* and carry out revision and ACPI HW reduced compliancy tests
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*/
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status = acpi_get_table(ACPI_SIG_FADT, 0, &table);
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if (ACPI_FAILURE(status)) {
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const char *msg = acpi_format_exception(status);
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pr_err("Failed to get FADT table, %s\n", msg);
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return -ENODEV;
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}
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fadt = (struct acpi_table_fadt *)table;
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/*
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* The revision in the table header is the FADT's Major revision. The
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* FADT also has a minor revision, which is stored in the FADT itself.
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*
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* TODO: Currently, we check for 6.5 as the minimum version to check
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* for HW_REDUCED flag. However, once RISC-V updates are released in
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* the ACPI spec, we need to update this check for exact minor revision
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*/
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if (table->revision < 6 || (table->revision == 6 && fadt->minor_revision < 5))
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pr_err(FW_BUG "Unsupported FADT revision %d.%d, should be 6.5+\n",
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table->revision, fadt->minor_revision);
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if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
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pr_err("FADT not ACPI hardware reduced compliant\n");
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ret = -EINVAL;
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}
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/*
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* acpi_get_table() creates FADT table mapping that
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* should be released after parsing and before resuming boot
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*/
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acpi_put_table(table);
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return ret;
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}
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/*
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* acpi_boot_table_init() called from setup_arch(), always.
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* 1. find RSDP and get its address, and then find XSDT
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* 2. extract all tables and checksums them all
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* 3. check ACPI FADT HW reduced flag
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*
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* We can parse ACPI boot-time tables such as MADT after
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* this function is called.
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*
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* On return ACPI is enabled if either:
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*
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* - ACPI tables are initialized and sanity checks passed
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* - acpi=force was passed in the command line and ACPI was not disabled
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* explicitly through acpi=off command line parameter
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*
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* ACPI is disabled on function return otherwise
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*/
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void __init acpi_boot_table_init(void)
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{
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/*
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* Enable ACPI instead of device tree unless
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* - ACPI has been disabled explicitly (acpi=off), or
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* - firmware has not populated ACPI ptr in EFI system table
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* and ACPI has not been [force] enabled (acpi=on|force)
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*/
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if (param_acpi_off ||
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(!param_acpi_on && !param_acpi_force &&
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efi.acpi20 == EFI_INVALID_TABLE_ADDR))
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return;
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/*
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* ACPI is disabled at this point. Enable it in order to parse
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* the ACPI tables and carry out sanity checks
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*/
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enable_acpi();
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/*
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* If ACPI tables are initialized and FADT sanity checks passed,
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* leave ACPI enabled and carry on booting; otherwise disable ACPI
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* on initialization error.
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* If acpi=force was passed on the command line it forces ACPI
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* to be enabled even if its initialization failed.
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*/
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if (acpi_table_init() || acpi_fadt_sanity_check()) {
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pr_err("Failed to init ACPI tables\n");
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if (!param_acpi_force)
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disable_acpi();
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}
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}
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static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end)
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{
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struct acpi_madt_rintc *rintc = (struct acpi_madt_rintc *)header;
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int cpuid;
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if (!(rintc->flags & ACPI_MADT_ENABLED))
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return 0;
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cpuid = riscv_hartid_to_cpuid(rintc->hart_id);
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/*
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* When CONFIG_SMP is disabled, mapping won't be created for
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* all cpus.
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* CPUs more than num_possible_cpus, will be ignored.
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*/
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if (cpuid >= 0 && cpuid < num_possible_cpus())
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cpu_madt_rintc[cpuid] = *rintc;
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return 0;
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}
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/*
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* Instead of parsing (and freeing) the ACPI table, cache
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* the RINTC structures since they are frequently used
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* like in cpuinfo.
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*/
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void __init acpi_init_rintc_map(void)
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{
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if (acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_madt_rintc, 0) <= 0) {
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pr_err("No valid RINTC entries exist\n");
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BUG();
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}
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}
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struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu)
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{
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return &cpu_madt_rintc[cpu];
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}
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u32 get_acpi_id_for_cpu(int cpu)
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{
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return acpi_cpu_get_madt_rintc(cpu)->uid;
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}
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/*
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* __acpi_map_table() will be called before paging_init(), so early_ioremap()
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* or early_memremap() should be called here to for ACPI table mapping.
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*/
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void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
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{
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if (!size)
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return NULL;
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return early_ioremap(phys, size);
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}
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void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
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{
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if (!map || !size)
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return;
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early_iounmap(map, size);
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}
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void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
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{
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efi_memory_desc_t *md, *region = NULL;
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pgprot_t prot;
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if (WARN_ON_ONCE(!efi_enabled(EFI_MEMMAP)))
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return NULL;
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for_each_efi_memory_desc(md) {
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u64 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
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if (phys < md->phys_addr || phys >= end)
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continue;
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if (phys + size > end) {
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pr_warn(FW_BUG "requested region covers multiple EFI memory regions\n");
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return NULL;
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}
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region = md;
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break;
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}
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/*
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* It is fine for AML to remap regions that are not represented in the
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* EFI memory map at all, as it only describes normal memory, and MMIO
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* regions that require a virtual mapping to make them accessible to
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* the EFI runtime services.
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*/
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prot = PAGE_KERNEL_IO;
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if (region) {
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switch (region->type) {
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case EFI_LOADER_CODE:
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case EFI_LOADER_DATA:
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case EFI_BOOT_SERVICES_CODE:
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case EFI_BOOT_SERVICES_DATA:
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case EFI_CONVENTIONAL_MEMORY:
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case EFI_PERSISTENT_MEMORY:
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if (memblock_is_map_memory(phys) ||
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!memblock_is_region_memory(phys, size)) {
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pr_warn(FW_BUG "requested region covers kernel memory\n");
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return NULL;
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}
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/*
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* Mapping kernel memory is permitted if the region in
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* question is covered by a single memblock with the
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* NOMAP attribute set: this enables the use of ACPI
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* table overrides passed via initramfs.
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* This particular use case only requires read access.
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*/
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fallthrough;
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case EFI_RUNTIME_SERVICES_CODE:
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/*
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* This would be unusual, but not problematic per se,
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* as long as we take care not to create a writable
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* mapping for executable code.
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*/
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prot = PAGE_KERNEL_RO;
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break;
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case EFI_ACPI_RECLAIM_MEMORY:
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/*
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* ACPI reclaim memory is used to pass firmware tables
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* and other data that is intended for consumption by
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* the OS only, which may decide it wants to reclaim
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* that memory and use it for something else. We never
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* do that, but we usually add it to the linear map
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* anyway, in which case we should use the existing
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* mapping.
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*/
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if (memblock_is_map_memory(phys))
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return (void __iomem *)__va(phys);
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fallthrough;
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default:
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if (region->attribute & EFI_MEMORY_WB)
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prot = PAGE_KERNEL;
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else if ((region->attribute & EFI_MEMORY_WC) ||
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(region->attribute & EFI_MEMORY_WT))
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prot = pgprot_writecombine(PAGE_KERNEL);
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}
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}
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return ioremap_prot(phys, size, pgprot_val(prot));
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}
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#ifdef CONFIG_PCI
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/*
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* These interfaces are defined just to enable building ACPI core.
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* TODO: Update it with actual implementation when external interrupt
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* controller support is added in RISC-V ACPI.
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*/
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int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
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int reg, int len, u32 *val)
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{
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
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int reg, int len, u32 val)
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{
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
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{
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return -1;
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}
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struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
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{
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return NULL;
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}
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#endif /* CONFIG_PCI */
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