![Rafael J. Wysocki](/assets/img/avatar_default.png)
Commitb9a5e5e18f
"ACPI / init: Fix the ordering of acpi_reserve_resources()" overlooked the fact that the memory and/or I/O regions reserved by acpi_reserve_resources() may conflict with those reserved by the PNP "system" driver. If that conflict actually takes place, it causes the reservations made by the "system" driver to fail while before commitb9a5e5e18f
all reservations made by it and by acpi_reserve_resources() would be successful. In turn, that allows the resources that haven't been reserved by the "system" driver to be used by others (e.g. PCI) which sometimes leads to functional problems (up to and including boot failures). To fix that issue, introduce a common resource reservation routine, acpi_reserve_region(), to be used by both acpi_reserve_resources() and the "system" driver, that will track all resources reserved by it and avoid making conflicting requests. Link: https://bugzilla.kernel.org/show_bug.cgi?id=99831 Link: http://marc.info/?t=143389402600001&r=1&w=2 Fixes:b9a5e5e18f
"ACPI / init: Fix the ordering of acpi_reserve_resources()" Reported-by: Roland Dreier <roland@purestorage.com> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
784 lines
23 KiB
C
784 lines
23 KiB
C
/*
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* drivers/acpi/resource.c - ACPI device resources interpretation.
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*
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* Copyright (C) 2012, Intel Corp.
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/ioport.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#ifdef CONFIG_X86
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#define valid_IRQ(i) (((i) != 0) && ((i) != 2))
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#else
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#define valid_IRQ(i) (true)
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#endif
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static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io)
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{
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u64 reslen = end - start + 1;
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/*
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* CHECKME: len might be required to check versus a minimum
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* length as well. 1 for io is fine, but for memory it does
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* not make any sense at all.
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* Note: some BIOSes report incorrect length for ACPI address space
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* descriptor, so remove check of 'reslen == len' to avoid regression.
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*/
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if (len && reslen && start <= end)
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return true;
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pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n",
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io ? "io" : "mem", start, end, len);
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return false;
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}
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static void acpi_dev_memresource_flags(struct resource *res, u64 len,
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u8 write_protect)
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{
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res->flags = IORESOURCE_MEM;
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if (!acpi_dev_resource_len_valid(res->start, res->end, len, false))
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res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
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if (write_protect == ACPI_READ_WRITE_MEMORY)
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res->flags |= IORESOURCE_MEM_WRITEABLE;
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}
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static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
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u8 write_protect)
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{
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res->start = start;
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res->end = start + len - 1;
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acpi_dev_memresource_flags(res, len, write_protect);
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}
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/**
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* acpi_dev_resource_memory - Extract ACPI memory resource information.
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* @ares: Input ACPI resource object.
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* @res: Output generic resource object.
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*
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* Check if the given ACPI resource object represents a memory resource and
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* if that's the case, use the information in it to populate the generic
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* resource object pointed to by @res.
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*
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* Return:
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* 1) false with res->flags setting to zero: not the expected resource type
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* 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
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* 3) true: valid assigned resource
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*/
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bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
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{
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struct acpi_resource_memory24 *memory24;
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struct acpi_resource_memory32 *memory32;
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struct acpi_resource_fixed_memory32 *fixed_memory32;
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switch (ares->type) {
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case ACPI_RESOURCE_TYPE_MEMORY24:
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memory24 = &ares->data.memory24;
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acpi_dev_get_memresource(res, memory24->minimum << 8,
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memory24->address_length << 8,
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memory24->write_protect);
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break;
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case ACPI_RESOURCE_TYPE_MEMORY32:
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memory32 = &ares->data.memory32;
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acpi_dev_get_memresource(res, memory32->minimum,
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memory32->address_length,
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memory32->write_protect);
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break;
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case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
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fixed_memory32 = &ares->data.fixed_memory32;
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acpi_dev_get_memresource(res, fixed_memory32->address,
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fixed_memory32->address_length,
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fixed_memory32->write_protect);
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break;
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default:
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res->flags = 0;
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return false;
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}
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return !(res->flags & IORESOURCE_DISABLED);
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}
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EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
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static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
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u8 io_decode)
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{
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res->flags = IORESOURCE_IO;
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if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
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res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
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if (res->end >= 0x10003)
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res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
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if (io_decode == ACPI_DECODE_16)
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res->flags |= IORESOURCE_IO_16BIT_ADDR;
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}
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static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
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u8 io_decode)
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{
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res->start = start;
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res->end = start + len - 1;
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acpi_dev_ioresource_flags(res, len, io_decode);
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}
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/**
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* acpi_dev_resource_io - Extract ACPI I/O resource information.
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* @ares: Input ACPI resource object.
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* @res: Output generic resource object.
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*
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* Check if the given ACPI resource object represents an I/O resource and
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* if that's the case, use the information in it to populate the generic
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* resource object pointed to by @res.
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*
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* Return:
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* 1) false with res->flags setting to zero: not the expected resource type
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* 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
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* 3) true: valid assigned resource
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*/
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bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
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{
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struct acpi_resource_io *io;
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struct acpi_resource_fixed_io *fixed_io;
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switch (ares->type) {
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case ACPI_RESOURCE_TYPE_IO:
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io = &ares->data.io;
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acpi_dev_get_ioresource(res, io->minimum,
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io->address_length,
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io->io_decode);
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break;
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case ACPI_RESOURCE_TYPE_FIXED_IO:
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fixed_io = &ares->data.fixed_io;
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acpi_dev_get_ioresource(res, fixed_io->address,
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fixed_io->address_length,
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ACPI_DECODE_10);
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break;
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default:
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res->flags = 0;
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return false;
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}
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return !(res->flags & IORESOURCE_DISABLED);
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}
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EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
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static bool acpi_decode_space(struct resource_win *win,
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struct acpi_resource_address *addr,
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struct acpi_address64_attribute *attr)
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{
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u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16;
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bool wp = addr->info.mem.write_protect;
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u64 len = attr->address_length;
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struct resource *res = &win->res;
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/*
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* Filter out invalid descriptor according to ACPI Spec 5.0, section
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* 6.4.3.5 Address Space Resource Descriptors.
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*/
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if ((addr->min_address_fixed != addr->max_address_fixed && len) ||
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(addr->min_address_fixed && addr->max_address_fixed && !len))
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pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",
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addr->min_address_fixed, addr->max_address_fixed, len);
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res->start = attr->minimum;
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res->end = attr->maximum;
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/*
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* For bridges that translate addresses across the bridge,
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* translation_offset is the offset that must be added to the
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* address on the secondary side to obtain the address on the
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* primary side. Non-bridge devices must list 0 for all Address
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* Translation offset bits.
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*/
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if (addr->producer_consumer == ACPI_PRODUCER) {
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res->start += attr->translation_offset;
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res->end += attr->translation_offset;
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} else if (attr->translation_offset) {
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pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n",
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attr->translation_offset);
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}
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switch (addr->resource_type) {
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case ACPI_MEMORY_RANGE:
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acpi_dev_memresource_flags(res, len, wp);
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break;
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case ACPI_IO_RANGE:
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acpi_dev_ioresource_flags(res, len, iodec);
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break;
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case ACPI_BUS_NUMBER_RANGE:
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res->flags = IORESOURCE_BUS;
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break;
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default:
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return false;
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}
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win->offset = attr->translation_offset;
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if (addr->producer_consumer == ACPI_PRODUCER)
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res->flags |= IORESOURCE_WINDOW;
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if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
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res->flags |= IORESOURCE_PREFETCH;
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return !(res->flags & IORESOURCE_DISABLED);
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}
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/**
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* acpi_dev_resource_address_space - Extract ACPI address space information.
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* @ares: Input ACPI resource object.
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* @win: Output generic resource object.
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*
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* Check if the given ACPI resource object represents an address space resource
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* and if that's the case, use the information in it to populate the generic
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* resource object pointed to by @win.
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*
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* Return:
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* 1) false with win->res.flags setting to zero: not the expected resource type
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* 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
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* resource
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* 3) true: valid assigned resource
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*/
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bool acpi_dev_resource_address_space(struct acpi_resource *ares,
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struct resource_win *win)
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{
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struct acpi_resource_address64 addr;
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win->res.flags = 0;
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if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
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return false;
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return acpi_decode_space(win, (struct acpi_resource_address *)&addr,
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&addr.address);
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}
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EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
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/**
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* acpi_dev_resource_ext_address_space - Extract ACPI address space information.
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* @ares: Input ACPI resource object.
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* @win: Output generic resource object.
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*
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* Check if the given ACPI resource object represents an extended address space
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* resource and if that's the case, use the information in it to populate the
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* generic resource object pointed to by @win.
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*
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* Return:
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* 1) false with win->res.flags setting to zero: not the expected resource type
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* 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
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* resource
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* 3) true: valid assigned resource
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*/
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bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
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struct resource_win *win)
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{
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struct acpi_resource_extended_address64 *ext_addr;
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win->res.flags = 0;
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if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
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return false;
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ext_addr = &ares->data.ext_address64;
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return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr,
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&ext_addr->address);
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}
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EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
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/**
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* acpi_dev_irq_flags - Determine IRQ resource flags.
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* @triggering: Triggering type as provided by ACPI.
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* @polarity: Interrupt polarity as provided by ACPI.
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* @shareable: Whether or not the interrupt is shareable.
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*/
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unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
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{
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unsigned long flags;
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if (triggering == ACPI_LEVEL_SENSITIVE)
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flags = polarity == ACPI_ACTIVE_LOW ?
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IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
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else
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flags = polarity == ACPI_ACTIVE_LOW ?
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IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
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if (shareable == ACPI_SHARED)
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flags |= IORESOURCE_IRQ_SHAREABLE;
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return flags | IORESOURCE_IRQ;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
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static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
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{
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res->start = gsi;
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res->end = gsi;
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res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
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}
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static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
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u8 triggering, u8 polarity, u8 shareable,
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bool legacy)
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{
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int irq, p, t;
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if (!valid_IRQ(gsi)) {
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acpi_dev_irqresource_disabled(res, gsi);
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return;
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}
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/*
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* In IO-APIC mode, use overrided attribute. Two reasons:
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* 1. BIOS bug in DSDT
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* 2. BIOS uses IO-APIC mode Interrupt Source Override
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*
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* We do this only if we are dealing with IRQ() or IRQNoFlags()
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* resource (the legacy ISA resources). With modern ACPI 5 devices
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* using extended IRQ descriptors we take the IRQ configuration
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* from _CRS directly.
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*/
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if (legacy && !acpi_get_override_irq(gsi, &t, &p)) {
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u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
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u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
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if (triggering != trig || polarity != pol) {
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pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
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t ? "level" : "edge", p ? "low" : "high");
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triggering = trig;
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polarity = pol;
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}
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}
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res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
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irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
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if (irq >= 0) {
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res->start = irq;
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res->end = irq;
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} else {
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acpi_dev_irqresource_disabled(res, gsi);
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}
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}
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/**
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* acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
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* @ares: Input ACPI resource object.
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* @index: Index into the array of GSIs represented by the resource.
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* @res: Output generic resource object.
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*
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* Check if the given ACPI resource object represents an interrupt resource
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* and @index does not exceed the resource's interrupt count (true is returned
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* in that case regardless of the results of the other checks)). If that's the
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* case, register the GSI corresponding to @index from the array of interrupts
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* represented by the resource and populate the generic resource object pointed
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* to by @res accordingly. If the registration of the GSI is not successful,
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* IORESOURCE_DISABLED will be set it that object's flags.
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*
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* Return:
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* 1) false with res->flags setting to zero: not the expected resource type
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* 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
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* 3) true: valid assigned resource
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*/
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bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
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struct resource *res)
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{
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struct acpi_resource_irq *irq;
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struct acpi_resource_extended_irq *ext_irq;
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switch (ares->type) {
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case ACPI_RESOURCE_TYPE_IRQ:
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/*
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* Per spec, only one interrupt per descriptor is allowed in
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* _CRS, but some firmware violates this, so parse them all.
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*/
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irq = &ares->data.irq;
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if (index >= irq->interrupt_count) {
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acpi_dev_irqresource_disabled(res, 0);
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return false;
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}
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acpi_dev_get_irqresource(res, irq->interrupts[index],
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irq->triggering, irq->polarity,
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irq->sharable, true);
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break;
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case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
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ext_irq = &ares->data.extended_irq;
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if (index >= ext_irq->interrupt_count) {
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acpi_dev_irqresource_disabled(res, 0);
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return false;
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}
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acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
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ext_irq->triggering, ext_irq->polarity,
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ext_irq->sharable, false);
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break;
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default:
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res->flags = 0;
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return false;
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}
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return true;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
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/**
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* acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
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* @list: The head of the resource list to free.
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*/
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void acpi_dev_free_resource_list(struct list_head *list)
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{
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resource_list_free(list);
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}
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EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
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struct res_proc_context {
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struct list_head *list;
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int (*preproc)(struct acpi_resource *, void *);
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void *preproc_data;
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int count;
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int error;
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};
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static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
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struct res_proc_context *c)
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{
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struct resource_entry *rentry;
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|
|
rentry = resource_list_create_entry(NULL, 0);
|
|
if (!rentry) {
|
|
c->error = -ENOMEM;
|
|
return AE_NO_MEMORY;
|
|
}
|
|
*rentry->res = win->res;
|
|
rentry->offset = win->offset;
|
|
resource_list_add_tail(rentry, c->list);
|
|
c->count++;
|
|
return AE_OK;
|
|
}
|
|
|
|
static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
|
|
void *context)
|
|
{
|
|
struct res_proc_context *c = context;
|
|
struct resource_win win;
|
|
struct resource *res = &win.res;
|
|
int i;
|
|
|
|
if (c->preproc) {
|
|
int ret;
|
|
|
|
ret = c->preproc(ares, c->preproc_data);
|
|
if (ret < 0) {
|
|
c->error = ret;
|
|
return AE_CTRL_TERMINATE;
|
|
} else if (ret > 0) {
|
|
return AE_OK;
|
|
}
|
|
}
|
|
|
|
memset(&win, 0, sizeof(win));
|
|
|
|
if (acpi_dev_resource_memory(ares, res)
|
|
|| acpi_dev_resource_io(ares, res)
|
|
|| acpi_dev_resource_address_space(ares, &win)
|
|
|| acpi_dev_resource_ext_address_space(ares, &win))
|
|
return acpi_dev_new_resource_entry(&win, c);
|
|
|
|
for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
|
|
acpi_status status;
|
|
|
|
status = acpi_dev_new_resource_entry(&win, c);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
}
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
/**
|
|
* acpi_dev_get_resources - Get current resources of a device.
|
|
* @adev: ACPI device node to get the resources for.
|
|
* @list: Head of the resultant list of resources (must be empty).
|
|
* @preproc: The caller's preprocessing routine.
|
|
* @preproc_data: Pointer passed to the caller's preprocessing routine.
|
|
*
|
|
* Evaluate the _CRS method for the given device node and process its output by
|
|
* (1) executing the @preproc() rountine provided by the caller, passing the
|
|
* resource pointer and @preproc_data to it as arguments, for each ACPI resource
|
|
* returned and (2) converting all of the returned ACPI resources into struct
|
|
* resource objects if possible. If the return value of @preproc() in step (1)
|
|
* is different from 0, step (2) is not applied to the given ACPI resource and
|
|
* if that value is negative, the whole processing is aborted and that value is
|
|
* returned as the final error code.
|
|
*
|
|
* The resultant struct resource objects are put on the list pointed to by
|
|
* @list, that must be empty initially, as members of struct resource_entry
|
|
* objects. Callers of this routine should use %acpi_dev_free_resource_list() to
|
|
* free that list.
|
|
*
|
|
* The number of resources in the output list is returned on success, an error
|
|
* code reflecting the error condition is returned otherwise.
|
|
*/
|
|
int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
|
|
int (*preproc)(struct acpi_resource *, void *),
|
|
void *preproc_data)
|
|
{
|
|
struct res_proc_context c;
|
|
acpi_status status;
|
|
|
|
if (!adev || !adev->handle || !list_empty(list))
|
|
return -EINVAL;
|
|
|
|
if (!acpi_has_method(adev->handle, METHOD_NAME__CRS))
|
|
return 0;
|
|
|
|
c.list = list;
|
|
c.preproc = preproc;
|
|
c.preproc_data = preproc_data;
|
|
c.count = 0;
|
|
c.error = 0;
|
|
status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
|
|
acpi_dev_process_resource, &c);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_dev_free_resource_list(list);
|
|
return c.error ? c.error : -EIO;
|
|
}
|
|
|
|
return c.count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
|
|
|
|
/**
|
|
* acpi_dev_filter_resource_type - Filter ACPI resource according to resource
|
|
* types
|
|
* @ares: Input ACPI resource object.
|
|
* @types: Valid resource types of IORESOURCE_XXX
|
|
*
|
|
* This is a helper function to support acpi_dev_get_resources(), which filters
|
|
* ACPI resource objects according to resource types.
|
|
*/
|
|
int acpi_dev_filter_resource_type(struct acpi_resource *ares,
|
|
unsigned long types)
|
|
{
|
|
unsigned long type = 0;
|
|
|
|
switch (ares->type) {
|
|
case ACPI_RESOURCE_TYPE_MEMORY24:
|
|
case ACPI_RESOURCE_TYPE_MEMORY32:
|
|
case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
|
|
type = IORESOURCE_MEM;
|
|
break;
|
|
case ACPI_RESOURCE_TYPE_IO:
|
|
case ACPI_RESOURCE_TYPE_FIXED_IO:
|
|
type = IORESOURCE_IO;
|
|
break;
|
|
case ACPI_RESOURCE_TYPE_IRQ:
|
|
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
|
|
type = IORESOURCE_IRQ;
|
|
break;
|
|
case ACPI_RESOURCE_TYPE_DMA:
|
|
case ACPI_RESOURCE_TYPE_FIXED_DMA:
|
|
type = IORESOURCE_DMA;
|
|
break;
|
|
case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
|
|
type = IORESOURCE_REG;
|
|
break;
|
|
case ACPI_RESOURCE_TYPE_ADDRESS16:
|
|
case ACPI_RESOURCE_TYPE_ADDRESS32:
|
|
case ACPI_RESOURCE_TYPE_ADDRESS64:
|
|
case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
|
|
if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
|
|
type = IORESOURCE_MEM;
|
|
else if (ares->data.address.resource_type == ACPI_IO_RANGE)
|
|
type = IORESOURCE_IO;
|
|
else if (ares->data.address.resource_type ==
|
|
ACPI_BUS_NUMBER_RANGE)
|
|
type = IORESOURCE_BUS;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return (type & types) ? 0 : 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
|
|
|
|
struct reserved_region {
|
|
struct list_head node;
|
|
u64 start;
|
|
u64 end;
|
|
};
|
|
|
|
static LIST_HEAD(reserved_io_regions);
|
|
static LIST_HEAD(reserved_mem_regions);
|
|
|
|
static int request_range(u64 start, u64 end, u8 space_id, unsigned long flags,
|
|
char *desc)
|
|
{
|
|
unsigned int length = end - start + 1;
|
|
struct resource *res;
|
|
|
|
res = space_id == ACPI_ADR_SPACE_SYSTEM_IO ?
|
|
request_region(start, length, desc) :
|
|
request_mem_region(start, length, desc);
|
|
if (!res)
|
|
return -EIO;
|
|
|
|
res->flags &= ~flags;
|
|
return 0;
|
|
}
|
|
|
|
static int add_region_before(u64 start, u64 end, u8 space_id,
|
|
unsigned long flags, char *desc,
|
|
struct list_head *head)
|
|
{
|
|
struct reserved_region *reg;
|
|
int error;
|
|
|
|
reg = kmalloc(sizeof(*reg), GFP_KERNEL);
|
|
if (!reg)
|
|
return -ENOMEM;
|
|
|
|
error = request_range(start, end, space_id, flags, desc);
|
|
if (error)
|
|
return error;
|
|
|
|
reg->start = start;
|
|
reg->end = end;
|
|
list_add_tail(®->node, head);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpi_reserve_region - Reserve an I/O or memory region as a system resource.
|
|
* @start: Starting address of the region.
|
|
* @length: Length of the region.
|
|
* @space_id: Identifier of address space to reserve the region from.
|
|
* @flags: Resource flags to clear for the region after requesting it.
|
|
* @desc: Region description (for messages).
|
|
*
|
|
* Reserve an I/O or memory region as a system resource to prevent others from
|
|
* using it. If the new region overlaps with one of the regions (in the given
|
|
* address space) already reserved by this routine, only the non-overlapping
|
|
* parts of it will be reserved.
|
|
*
|
|
* Returned is either 0 (success) or a negative error code indicating a resource
|
|
* reservation problem. It is the code of the first encountered error, but the
|
|
* routine doesn't abort until it has attempted to request all of the parts of
|
|
* the new region that don't overlap with other regions reserved previously.
|
|
*
|
|
* The resources requested by this routine are never released.
|
|
*/
|
|
int acpi_reserve_region(u64 start, unsigned int length, u8 space_id,
|
|
unsigned long flags, char *desc)
|
|
{
|
|
struct list_head *regions;
|
|
struct reserved_region *reg;
|
|
u64 end = start + length - 1;
|
|
int ret = 0, error = 0;
|
|
|
|
if (space_id == ACPI_ADR_SPACE_SYSTEM_IO)
|
|
regions = &reserved_io_regions;
|
|
else if (space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
|
|
regions = &reserved_mem_regions;
|
|
else
|
|
return -EINVAL;
|
|
|
|
if (list_empty(regions))
|
|
return add_region_before(start, end, space_id, flags, desc, regions);
|
|
|
|
list_for_each_entry(reg, regions, node)
|
|
if (reg->start == end + 1) {
|
|
/* The new region can be prepended to this one. */
|
|
ret = request_range(start, end, space_id, flags, desc);
|
|
if (!ret)
|
|
reg->start = start;
|
|
|
|
return ret;
|
|
} else if (reg->start > end) {
|
|
/* No overlap. Add the new region here and get out. */
|
|
return add_region_before(start, end, space_id, flags,
|
|
desc, ®->node);
|
|
} else if (reg->end == start - 1) {
|
|
goto combine;
|
|
} else if (reg->end >= start) {
|
|
goto overlap;
|
|
}
|
|
|
|
/* The new region goes after the last existing one. */
|
|
return add_region_before(start, end, space_id, flags, desc, regions);
|
|
|
|
overlap:
|
|
/*
|
|
* The new region overlaps an existing one.
|
|
*
|
|
* The head part of the new region immediately preceding the existing
|
|
* overlapping one can be combined with it right away.
|
|
*/
|
|
if (reg->start > start) {
|
|
error = request_range(start, reg->start - 1, space_id, flags, desc);
|
|
if (error)
|
|
ret = error;
|
|
else
|
|
reg->start = start;
|
|
}
|
|
|
|
combine:
|
|
/*
|
|
* The new region is adjacent to an existing one. If it extends beyond
|
|
* that region all the way to the next one, it is possible to combine
|
|
* all three of them.
|
|
*/
|
|
while (reg->end < end) {
|
|
struct reserved_region *next = NULL;
|
|
u64 a = reg->end + 1, b = end;
|
|
|
|
if (!list_is_last(®->node, regions)) {
|
|
next = list_next_entry(reg, node);
|
|
if (next->start <= end)
|
|
b = next->start - 1;
|
|
}
|
|
error = request_range(a, b, space_id, flags, desc);
|
|
if (!error) {
|
|
if (next && next->start == b + 1) {
|
|
reg->end = next->end;
|
|
list_del(&next->node);
|
|
kfree(next);
|
|
} else {
|
|
reg->end = end;
|
|
break;
|
|
}
|
|
} else if (next) {
|
|
if (!ret)
|
|
ret = error;
|
|
|
|
reg = next;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret ? ret : error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_reserve_region);
|