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35732699f5
Linus reported that: After commita103f46633
the kernel stopped compiling for several ARM32 platforms that I am building with a bare metal compiler. Bare metal compilers (arm-none-eabi-) don't define __linux__. This is because the header <acpi/platform/acenv.h> is now in the include path for <linux/irq.h>: CC arch/arm/kernel/irq.o CC kernel/sysctl.o CC crypto/api.o In file included from ../include/acpi/acpi.h:22, from ../include/linux/fw_table.h:29, from ../include/linux/acpi.h:18, from ../include/linux/irqchip.h:14, from ../arch/arm/kernel/irq.c:25: ../include/acpi/platform/acenv.h:218:2: error: #error Unknown target environment 218 | #error Unknown target environment | ^~~~~ The issue is caused by the introducing of splitting out the ACPI code to support the new generic fw_table code. Rafael suggested [1] moving the fw_table.h include in linux/acpi.h to below the linux/mutex.h. Remove the two includes in fw_table.h. Replace linux/fw_table.h include in fw_table.c with linux/acpi.h. Link: https://lore.kernel.org/linux-acpi/CAJZ5v0idWdJq3JSqQWLG5q+b+b=zkEdWR55rGYEoxh7R6N8kFQ@mail.gmail.com/ Fixes:a103f46633
("acpi: Move common tables helper functions to common lib") Closes: https://lore.kernel.org/linux-acpi/20231114-arm-build-bug-v1-1-458745fe32a4@linaro.org/ Reported-by: Linus Walleij <linus.walleij@linaro.org> Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Dave Jiang <dave.jiang@intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
189 lines
4.9 KiB
C
189 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* fw_tables.c - Parsing support for ACPI and ACPI-like tables provided by
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* platform or device firmware
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*
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* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2023 Intel Corp.
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*/
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#include <linux/errno.h>
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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enum acpi_subtable_type {
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ACPI_SUBTABLE_COMMON,
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ACPI_SUBTABLE_HMAT,
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ACPI_SUBTABLE_PRMT,
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ACPI_SUBTABLE_CEDT,
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};
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struct acpi_subtable_entry {
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union acpi_subtable_headers *hdr;
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enum acpi_subtable_type type;
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};
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static unsigned long __init_or_acpilib
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acpi_get_entry_type(struct acpi_subtable_entry *entry)
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{
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switch (entry->type) {
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case ACPI_SUBTABLE_COMMON:
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return entry->hdr->common.type;
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case ACPI_SUBTABLE_HMAT:
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return entry->hdr->hmat.type;
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case ACPI_SUBTABLE_PRMT:
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return 0;
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case ACPI_SUBTABLE_CEDT:
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return entry->hdr->cedt.type;
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}
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return 0;
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}
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static unsigned long __init_or_acpilib
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acpi_get_entry_length(struct acpi_subtable_entry *entry)
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{
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switch (entry->type) {
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case ACPI_SUBTABLE_COMMON:
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return entry->hdr->common.length;
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case ACPI_SUBTABLE_HMAT:
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return entry->hdr->hmat.length;
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case ACPI_SUBTABLE_PRMT:
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return entry->hdr->prmt.length;
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case ACPI_SUBTABLE_CEDT:
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return entry->hdr->cedt.length;
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}
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return 0;
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}
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static unsigned long __init_or_acpilib
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acpi_get_subtable_header_length(struct acpi_subtable_entry *entry)
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{
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switch (entry->type) {
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case ACPI_SUBTABLE_COMMON:
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return sizeof(entry->hdr->common);
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case ACPI_SUBTABLE_HMAT:
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return sizeof(entry->hdr->hmat);
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case ACPI_SUBTABLE_PRMT:
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return sizeof(entry->hdr->prmt);
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case ACPI_SUBTABLE_CEDT:
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return sizeof(entry->hdr->cedt);
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}
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return 0;
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}
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static enum acpi_subtable_type __init_or_acpilib
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acpi_get_subtable_type(char *id)
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{
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if (strncmp(id, ACPI_SIG_HMAT, 4) == 0)
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return ACPI_SUBTABLE_HMAT;
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if (strncmp(id, ACPI_SIG_PRMT, 4) == 0)
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return ACPI_SUBTABLE_PRMT;
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if (strncmp(id, ACPI_SIG_CEDT, 4) == 0)
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return ACPI_SUBTABLE_CEDT;
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return ACPI_SUBTABLE_COMMON;
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}
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static __init_or_acpilib bool has_handler(struct acpi_subtable_proc *proc)
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{
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return proc->handler || proc->handler_arg;
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}
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static __init_or_acpilib int call_handler(struct acpi_subtable_proc *proc,
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union acpi_subtable_headers *hdr,
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unsigned long end)
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{
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if (proc->handler)
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return proc->handler(hdr, end);
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if (proc->handler_arg)
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return proc->handler_arg(hdr, proc->arg, end);
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return -EINVAL;
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}
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/**
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* acpi_parse_entries_array - for each proc_num find a suitable subtable
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*
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* @id: table id (for debugging purposes)
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* @table_size: size of the root table
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* @table_header: where does the table start?
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* @proc: array of acpi_subtable_proc struct containing entry id
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* and associated handler with it
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* @proc_num: how big proc is?
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* @max_entries: how many entries can we process?
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*
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* For each proc_num find a subtable with proc->id and run proc->handler
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* on it. Assumption is that there's only single handler for particular
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* entry id.
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*
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* The table_size is not the size of the complete ACPI table (the length
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* field in the header struct), but only the size of the root table; i.e.,
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* the offset from the very first byte of the complete ACPI table, to the
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* first byte of the very first subtable.
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*
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* On success returns sum of all matching entries for all proc handlers.
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* Otherwise, -ENODEV or -EINVAL is returned.
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*/
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int __init_or_acpilib
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acpi_parse_entries_array(char *id, unsigned long table_size,
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struct acpi_table_header *table_header,
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struct acpi_subtable_proc *proc,
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int proc_num, unsigned int max_entries)
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{
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unsigned long table_end, subtable_len, entry_len;
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struct acpi_subtable_entry entry;
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int count = 0;
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int errs = 0;
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int i;
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table_end = (unsigned long)table_header + table_header->length;
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/* Parse all entries looking for a match. */
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entry.type = acpi_get_subtable_type(id);
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entry.hdr = (union acpi_subtable_headers *)
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((unsigned long)table_header + table_size);
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subtable_len = acpi_get_subtable_header_length(&entry);
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while (((unsigned long)entry.hdr) + subtable_len < table_end) {
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if (max_entries && count >= max_entries)
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break;
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for (i = 0; i < proc_num; i++) {
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if (acpi_get_entry_type(&entry) != proc[i].id)
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continue;
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if (!has_handler(&proc[i]) ||
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(!errs &&
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call_handler(&proc[i], entry.hdr, table_end))) {
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errs++;
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continue;
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}
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proc[i].count++;
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break;
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}
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if (i != proc_num)
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count++;
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/*
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* If entry->length is 0, break from this loop to avoid
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* infinite loop.
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*/
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entry_len = acpi_get_entry_length(&entry);
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if (entry_len == 0) {
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pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
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return -EINVAL;
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}
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entry.hdr = (union acpi_subtable_headers *)
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((unsigned long)entry.hdr + entry_len);
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}
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if (max_entries && count > max_entries) {
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pr_warn("[%4.4s:0x%02x] found the maximum %i entries\n",
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id, proc->id, count);
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}
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return errs ? -EINVAL : count;
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}
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