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![Linus Torvalds](/assets/img/avatar_default.png)
- Update the ACPICA kernel code to upstream revision 20180105 including: * Assorted fixes (Jung-uk Kim). * Support for X32 ABI compilation (Anuj Mittal). * Update of ACPICA copyrights to 2018 (Bob Moore). - Prepare for future modifications to avoid executing the _STA control method too early (Hans de Goede). - Make the processor performance control library code ignore _PPC notifications if they cannot be handled and fix up the C1 idle state definition when it is used as a fallback state (Chen Yu, Yazen Ghannam). - Make it possible to use the SPCR table on x86 and to replace the original IORT table with a new one from initrd (Prarit Bhargava, Shunyong Yang). - Add battery-related quirks for Asus UX360UA and UX410UAK and add quirks for table parsing on Dell XPS 9570 and Precision M5530 (Kai Heng Feng). - Address static checker warnings in the CPPC code (Gustavo Silva). - Avoid printing a raw pointer to the kernel log in the smart battery driver (Greg Kroah-Hartman). -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJafGvJAAoJEILEb/54YlRxiusQAKUa+OM/oxTJkOEfGGRM8NlS Hq/PaL/TnAj3nCoZN9fM38mI4gkxqu3eVMv6kfiqRe8VYmUX9r9tRbQ9kxvEYa7n s6Dl+wdC9UND20QJkYVzPlaXbPuZyLFHt4Fkb1hp+HAGgNNYqc4e0lJvI82F2pdo im1UFI84jg9UQV4WpUJL6ny2c/RMNtpUV5fOKFD8lkvBvVe7mtZTZ+1nZDeqXGkV jzdrVTHLUEDhjS1o0TBmEsJGNeGOqnK/f+m8Rq4397guPAQQq18MYNC68SzhuGjP iqhvIvI9sF197i66l/qgsubBifOV4At8Wb0LA5cU8CQLLpEW8GDktz/kucVHyzJ4 cVKuPXptBwwtPbNFHWO8reTUFMAnP7IpjtC31ntr6xWRQCiXv0/i2hRRN54g9T7e FAOBmmys5DKFOq50OB5WdD3/Qz5OUuVgdbrSxNFARIZpQFtUn7Np2/nmNpPgrrcl 77hO8dpeXUTVvM4HpRQN1+r0KOTLfTAvWV7LYLAjCF9ivc0Vop/tYZQ2VEMSUEFD SGKC30mGC4pphAjxcSYV282JR7Jx7arQ71ZA5uYTRRuxnEQd/2MC71fNjrFmCgUW 1Pumw0Pw6eZRjj1FZ/pj0X5lm7AlZj0dVzsJFgNb0FcJW0nOhN3czQrA4igoSVng B2sRv9U8YDnDtzHyTPrY =rVdp -----END PGP SIGNATURE----- Merge tag 'acpi-part2-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull more ACPI updates from Rafael Wysocki: "These are mostly fixes and cleanups, a few new quirks, a couple of updates related to the handling of ACPI tables and ACPICA copyrights refreshment. Specifics: - Update the ACPICA kernel code to upstream revision 20180105 including: * Assorted fixes (Jung-uk Kim) * Support for X32 ABI compilation (Anuj Mittal) * Update of ACPICA copyrights to 2018 (Bob Moore) - Prepare for future modifications to avoid executing the _STA control method too early (Hans de Goede) - Make the processor performance control library code ignore _PPC notifications if they cannot be handled and fix up the C1 idle state definition when it is used as a fallback state (Chen Yu, Yazen Ghannam) - Make it possible to use the SPCR table on x86 and to replace the original IORT table with a new one from initrd (Prarit Bhargava, Shunyong Yang) - Add battery-related quirks for Asus UX360UA and UX410UAK and add quirks for table parsing on Dell XPS 9570 and Precision M5530 (Kai Heng Feng) - Address static checker warnings in the CPPC code (Gustavo Silva) - Avoid printing a raw pointer to the kernel log in the smart battery driver (Greg Kroah-Hartman)" * tag 'acpi-part2-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI: sbshc: remove raw pointer from printk() message ACPI: SPCR: Make SPCR available to x86 ACPI / CPPC: Use 64-bit arithmetic instead of 32-bit ACPI / tables: Add IORT to injectable table list ACPI / bus: Parse tables as term_list for Dell XPS 9570 and Precision M5530 ACPICA: Update version to 20180105 ACPICA: All acpica: Update copyrights to 2018 ACPI / processor: Set default C1 idle state description ACPI / battery: Add quirk for Asus UX360UA and UX410UAK ACPI: processor_perflib: Do not send _PPC change notification if not ready ACPI / scan: Use acpi_bus_get_status() to initialize ACPI_TYPE_DEVICE devs ACPI / bus: Do not call _STA on battery devices with unmet dependencies PCI: acpiphp_ibm: prepare for acpi_get_object_info() no longer returning status ACPI: export acpi_bus_get_status_handle() ACPICA: Add a missing pair of parentheses ACPICA: Prefer ACPI_TO_POINTER() over ACPI_ADD_PTR() ACPICA: Avoid NULL pointer arithmetic ACPICA: Linux: add support for X32 ABI compilation ACPI / video: Use true for boolean value
489 lines
14 KiB
C
489 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* ACPI PCI Hot Plug IBM Extension
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*
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* Copyright (C) 2004 Vernon Mauery <vernux@us.ibm.com>
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* Copyright (C) 2004 IBM Corp.
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*
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* All rights reserved.
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*
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* Send feedback to <vernux@us.ibm.com>
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*
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*/
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#define pr_fmt(fmt) "acpiphp_ibm: " fmt
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include <linux/moduleparam.h>
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#include <linux/pci.h>
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#include <linux/uaccess.h>
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#include "acpiphp.h"
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#include "../pci.h"
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#define DRIVER_VERSION "1.0.1"
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#define DRIVER_AUTHOR "Irene Zubarev <zubarev@us.ibm.com>, Vernon Mauery <vernux@us.ibm.com>"
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#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver IBM extension"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRIVER_VERSION);
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#define FOUND_APCI 0x61504349
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/* these are the names for the IBM ACPI pseudo-device */
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#define IBM_HARDWARE_ID1 "IBM37D0"
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#define IBM_HARDWARE_ID2 "IBM37D4"
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#define hpslot_to_sun(A) (((struct slot *)((A)->private))->sun)
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/* union apci_descriptor - allows access to the
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* various device descriptors that are embedded in the
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* aPCI table
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*/
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union apci_descriptor {
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struct {
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char sig[4];
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u8 len;
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} header;
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struct {
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u8 type;
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u8 len;
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u16 slot_id;
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u8 bus_id;
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u8 dev_num;
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u8 slot_num;
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u8 slot_attr[2];
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u8 attn;
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u8 status[2];
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u8 sun;
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u8 res[3];
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} slot;
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struct {
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u8 type;
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u8 len;
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} generic;
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};
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/* struct notification - keeps info about the device
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* that cause the ACPI notification event
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*/
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struct notification {
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struct acpi_device *device;
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u8 event;
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};
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static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status);
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static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status);
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static void ibm_handle_events(acpi_handle handle, u32 event, void *context);
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static int ibm_get_table_from_acpi(char **bufp);
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static ssize_t ibm_read_apci_table(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buffer, loff_t pos, size_t size);
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static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
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u32 lvl, void *context, void **rv);
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static int __init ibm_acpiphp_init(void);
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static void __exit ibm_acpiphp_exit(void);
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static acpi_handle ibm_acpi_handle;
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static struct notification ibm_note;
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static struct bin_attribute ibm_apci_table_attr __ro_after_init = {
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.attr = {
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.name = "apci_table",
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.mode = S_IRUGO,
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},
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.read = ibm_read_apci_table,
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.write = NULL,
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};
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static struct acpiphp_attention_info ibm_attention_info =
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{
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.set_attn = ibm_set_attention_status,
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.get_attn = ibm_get_attention_status,
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.owner = THIS_MODULE,
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};
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/**
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* ibm_slot_from_id - workaround for bad ibm hardware
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* @id: the slot number that linux refers to the slot by
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*
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* Description: This method returns the aCPI slot descriptor
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* corresponding to the Linux slot number. This descriptor
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* has info about the aPCI slot id and attention status.
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* This descriptor must be freed using kfree when done.
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*/
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static union apci_descriptor *ibm_slot_from_id(int id)
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{
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int ind = 0, size;
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union apci_descriptor *ret = NULL, *des;
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char *table;
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size = ibm_get_table_from_acpi(&table);
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if (size < 0)
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return NULL;
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des = (union apci_descriptor *)table;
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if (memcmp(des->header.sig, "aPCI", 4) != 0)
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goto ibm_slot_done;
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des = (union apci_descriptor *)&table[ind += des->header.len];
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while (ind < size && (des->generic.type != 0x82 ||
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des->slot.slot_num != id)) {
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des = (union apci_descriptor *)&table[ind += des->generic.len];
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}
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if (ind < size && des->slot.slot_num == id)
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ret = des;
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ibm_slot_done:
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if (ret) {
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ret = kmalloc(sizeof(union apci_descriptor), GFP_KERNEL);
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if (ret)
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memcpy(ret, des, sizeof(union apci_descriptor));
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}
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kfree(table);
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return ret;
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}
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/**
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* ibm_set_attention_status - callback method to set the attention LED
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* @slot: the hotplug_slot to work with
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* @status: what to set the LED to (0 or 1)
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*
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* Description: This method is registered with the acpiphp module as a
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* callback to do the device specific task of setting the LED status.
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*/
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static int ibm_set_attention_status(struct hotplug_slot *slot, u8 status)
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{
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union acpi_object args[2];
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struct acpi_object_list params = { .pointer = args, .count = 2 };
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acpi_status stat;
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unsigned long long rc;
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union apci_descriptor *ibm_slot;
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int id = hpslot_to_sun(slot);
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ibm_slot = ibm_slot_from_id(id);
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if (!ibm_slot) {
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pr_err("APLS null ACPI descriptor for slot %d\n", id);
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return -ENODEV;
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}
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pr_debug("%s: set slot %d (%d) attention status to %d\n", __func__,
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ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
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(status ? 1 : 0));
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args[0].type = ACPI_TYPE_INTEGER;
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args[0].integer.value = ibm_slot->slot.slot_id;
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args[1].type = ACPI_TYPE_INTEGER;
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args[1].integer.value = (status) ? 1 : 0;
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kfree(ibm_slot);
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stat = acpi_evaluate_integer(ibm_acpi_handle, "APLS", ¶ms, &rc);
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if (ACPI_FAILURE(stat)) {
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pr_err("APLS evaluation failed: 0x%08x\n", stat);
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return -ENODEV;
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} else if (!rc) {
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pr_err("APLS method failed: 0x%08llx\n", rc);
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return -ERANGE;
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}
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return 0;
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}
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/**
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* ibm_get_attention_status - callback method to get attention LED status
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* @slot: the hotplug_slot to work with
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* @status: returns what the LED is set to (0 or 1)
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*
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* Description: This method is registered with the acpiphp module as a
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* callback to do the device specific task of getting the LED status.
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*
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* Because there is no direct method of getting the LED status directly
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* from an ACPI call, we read the aPCI table and parse out our
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* slot descriptor to read the status from that.
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*/
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static int ibm_get_attention_status(struct hotplug_slot *slot, u8 *status)
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{
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union apci_descriptor *ibm_slot;
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int id = hpslot_to_sun(slot);
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ibm_slot = ibm_slot_from_id(id);
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if (!ibm_slot) {
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pr_err("APLS null ACPI descriptor for slot %d\n", id);
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return -ENODEV;
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}
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if (ibm_slot->slot.attn & 0xa0 || ibm_slot->slot.status[1] & 0x08)
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*status = 1;
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else
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*status = 0;
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pr_debug("%s: get slot %d (%d) attention status is %d\n", __func__,
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ibm_slot->slot.slot_num, ibm_slot->slot.slot_id,
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*status);
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kfree(ibm_slot);
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return 0;
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}
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/**
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* ibm_handle_events - listens for ACPI events for the IBM37D0 device
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* @handle: an ACPI handle to the device that caused the event
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* @event: the event info (device specific)
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* @context: passed context (our notification struct)
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*
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* Description: This method is registered as a callback with the ACPI
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* subsystem it is called when this device has an event to notify the OS of.
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*
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* The events actually come from the device as two events that get
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* synthesized into one event with data by this function. The event
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* ID comes first and then the slot number that caused it. We report
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* this as one event to the OS.
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*
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* From section 5.6.2.2 of the ACPI 2.0 spec, I understand that the OSPM will
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* only re-enable the interrupt that causes this event AFTER this method
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* has returned, thereby enforcing serial access for the notification struct.
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*/
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static void ibm_handle_events(acpi_handle handle, u32 event, void *context)
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{
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u8 detail = event & 0x0f;
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u8 subevent = event & 0xf0;
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struct notification *note = context;
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pr_debug("%s: Received notification %02x\n", __func__, event);
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if (subevent == 0x80) {
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pr_debug("%s: generating bus event\n", __func__);
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acpi_bus_generate_netlink_event(note->device->pnp.device_class,
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dev_name(¬e->device->dev),
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note->event, detail);
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} else
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note->event = event;
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}
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/**
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* ibm_get_table_from_acpi - reads the APLS buffer from ACPI
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* @bufp: address to pointer to allocate for the table
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*
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* Description: This method reads the APLS buffer in from ACPI and
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* stores the "stripped" table into a single buffer
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* it allocates and passes the address back in bufp.
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*
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* If NULL is passed in as buffer, this method only calculates
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* the size of the table and returns that without filling
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* in the buffer.
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*
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* Returns < 0 on error or the size of the table on success.
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*/
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static int ibm_get_table_from_acpi(char **bufp)
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{
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union acpi_object *package;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_status status;
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char *lbuf = NULL;
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int i, size = -EIO;
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status = acpi_evaluate_object(ibm_acpi_handle, "APCI", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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pr_err("%s: APCI evaluation failed\n", __func__);
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return -ENODEV;
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}
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package = (union acpi_object *) buffer.pointer;
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if (!(package) ||
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(package->type != ACPI_TYPE_PACKAGE) ||
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!(package->package.elements)) {
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pr_err("%s: Invalid APCI object\n", __func__);
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goto read_table_done;
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}
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for (size = 0, i = 0; i < package->package.count; i++) {
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if (package->package.elements[i].type != ACPI_TYPE_BUFFER) {
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pr_err("%s: Invalid APCI element %d\n", __func__, i);
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goto read_table_done;
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}
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size += package->package.elements[i].buffer.length;
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}
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if (bufp == NULL)
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goto read_table_done;
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lbuf = kzalloc(size, GFP_KERNEL);
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pr_debug("%s: element count: %i, ASL table size: %i, &table = 0x%p\n",
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__func__, package->package.count, size, lbuf);
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if (lbuf) {
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*bufp = lbuf;
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} else {
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size = -ENOMEM;
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goto read_table_done;
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}
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size = 0;
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for (i = 0; i < package->package.count; i++) {
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memcpy(&lbuf[size],
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package->package.elements[i].buffer.pointer,
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package->package.elements[i].buffer.length);
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size += package->package.elements[i].buffer.length;
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}
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read_table_done:
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kfree(buffer.pointer);
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return size;
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}
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/**
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* ibm_read_apci_table - callback for the sysfs apci_table file
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* @filp: the open sysfs file
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* @kobj: the kobject this binary attribute is a part of
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* @bin_attr: struct bin_attribute for this file
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* @buffer: the kernel space buffer to fill
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* @pos: the offset into the file
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* @size: the number of bytes requested
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*
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* Description: Gets registered with sysfs as the reader callback
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* to be executed when /sys/bus/pci/slots/apci_table gets read.
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*
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* Since we don't get notified on open and close for this file,
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* things get really tricky here...
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* our solution is to only allow reading the table in all at once.
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*/
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static ssize_t ibm_read_apci_table(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buffer, loff_t pos, size_t size)
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{
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int bytes_read = -EINVAL;
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char *table = NULL;
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pr_debug("%s: pos = %d, size = %zd\n", __func__, (int)pos, size);
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if (pos == 0) {
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bytes_read = ibm_get_table_from_acpi(&table);
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if (bytes_read > 0 && bytes_read <= size)
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memcpy(buffer, table, bytes_read);
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kfree(table);
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}
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return bytes_read;
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}
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/**
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* ibm_find_acpi_device - callback to find our ACPI device
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* @handle: the ACPI handle of the device we are inspecting
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* @lvl: depth into the namespace tree
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* @context: a pointer to our handle to fill when we find the device
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* @rv: a return value to fill if desired
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*
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* Description: Used as a callback when calling acpi_walk_namespace
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* to find our device. When this method returns non-zero
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* acpi_walk_namespace quits its search and returns our value.
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*/
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static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
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u32 lvl, void *context, void **rv)
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{
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acpi_handle *phandle = (acpi_handle *)context;
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unsigned long long current_status = 0;
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acpi_status status;
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struct acpi_device_info *info;
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int retval = 0;
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status = acpi_get_object_info(handle, &info);
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if (ACPI_FAILURE(status)) {
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pr_err("%s: Failed to get device information status=0x%x\n",
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__func__, status);
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return retval;
|
|
}
|
|
|
|
acpi_bus_get_status_handle(handle, ¤t_status);
|
|
|
|
if (current_status && (info->valid & ACPI_VALID_HID) &&
|
|
(!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||
|
|
!strcmp(info->hardware_id.string, IBM_HARDWARE_ID2))) {
|
|
pr_debug("found hardware: %s, handle: %p\n",
|
|
info->hardware_id.string, handle);
|
|
*phandle = handle;
|
|
/* returning non-zero causes the search to stop
|
|
* and returns this value to the caller of
|
|
* acpi_walk_namespace, but it also causes some warnings
|
|
* in the acpi debug code to print...
|
|
*/
|
|
retval = FOUND_APCI;
|
|
}
|
|
kfree(info);
|
|
return retval;
|
|
}
|
|
|
|
static int __init ibm_acpiphp_init(void)
|
|
{
|
|
int retval = 0;
|
|
acpi_status status;
|
|
struct acpi_device *device;
|
|
struct kobject *sysdir = &pci_slots_kset->kobj;
|
|
|
|
pr_debug("%s\n", __func__);
|
|
|
|
if (acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, ibm_find_acpi_device, NULL,
|
|
&ibm_acpi_handle, NULL) != FOUND_APCI) {
|
|
pr_err("%s: acpi_walk_namespace failed\n", __func__);
|
|
retval = -ENODEV;
|
|
goto init_return;
|
|
}
|
|
pr_debug("%s: found IBM aPCI device\n", __func__);
|
|
if (acpi_bus_get_device(ibm_acpi_handle, &device)) {
|
|
pr_err("%s: acpi_bus_get_device failed\n", __func__);
|
|
retval = -ENODEV;
|
|
goto init_return;
|
|
}
|
|
if (acpiphp_register_attention(&ibm_attention_info)) {
|
|
retval = -ENODEV;
|
|
goto init_return;
|
|
}
|
|
|
|
ibm_note.device = device;
|
|
status = acpi_install_notify_handler(ibm_acpi_handle,
|
|
ACPI_DEVICE_NOTIFY, ibm_handle_events,
|
|
&ibm_note);
|
|
if (ACPI_FAILURE(status)) {
|
|
pr_err("%s: Failed to register notification handler\n",
|
|
__func__);
|
|
retval = -EBUSY;
|
|
goto init_cleanup;
|
|
}
|
|
|
|
ibm_apci_table_attr.size = ibm_get_table_from_acpi(NULL);
|
|
retval = sysfs_create_bin_file(sysdir, &ibm_apci_table_attr);
|
|
|
|
return retval;
|
|
|
|
init_cleanup:
|
|
acpiphp_unregister_attention(&ibm_attention_info);
|
|
init_return:
|
|
return retval;
|
|
}
|
|
|
|
static void __exit ibm_acpiphp_exit(void)
|
|
{
|
|
acpi_status status;
|
|
struct kobject *sysdir = &pci_slots_kset->kobj;
|
|
|
|
pr_debug("%s\n", __func__);
|
|
|
|
if (acpiphp_unregister_attention(&ibm_attention_info))
|
|
pr_err("%s: attention info deregistration failed", __func__);
|
|
|
|
status = acpi_remove_notify_handler(
|
|
ibm_acpi_handle,
|
|
ACPI_DEVICE_NOTIFY,
|
|
ibm_handle_events);
|
|
if (ACPI_FAILURE(status))
|
|
pr_err("%s: Notification handler removal failed\n", __func__);
|
|
/* remove the /sys entries */
|
|
sysfs_remove_bin_file(sysdir, &ibm_apci_table_attr);
|
|
}
|
|
|
|
module_init(ibm_acpiphp_init);
|
|
module_exit(ibm_acpiphp_exit);
|