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![Arnd Bergmann](/assets/img/avatar_default.png)
The setup_crash_devices_work_queue function only partially initializes
the message it sends to chipset_init, leading to undefined behavior:
drivers/visorbus/visorchipset.c: In function 'setup_crash_devices_work_queue':
drivers/visorbus/visorchipset.c:333:6: error: '((unsigned char*)&msg.hdr.flags)[0]' is used uninitialized in this function [-Werror=uninitialized]
if (inmsg->hdr.flags.response_expected)
Set up the entire structure, zero-initializing the 'response_expected'
flag.
This was apparently found by the patch that added the -O3 build option
in Kconfig.
Fixes: 12e364b9f0
("staging: visorchipset driver to provide registration and other services")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20200107202950.782951-1-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1689 lines
47 KiB
C
1689 lines
47 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2010 - 2015 UNISYS CORPORATION
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* All rights reserved.
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*/
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#include <linux/acpi.h>
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#include <linux/crash_dump.h>
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#include <linux/visorbus.h>
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#include "visorbus_private.h"
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/* {72120008-4AAB-11DC-8530-444553544200} */
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#define VISOR_SIOVM_GUID GUID_INIT(0x72120008, 0x4AAB, 0x11DC, 0x85, 0x30, \
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0x44, 0x45, 0x53, 0x54, 0x42, 0x00)
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static const guid_t visor_vhba_channel_guid = VISOR_VHBA_CHANNEL_GUID;
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static const guid_t visor_siovm_guid = VISOR_SIOVM_GUID;
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static const guid_t visor_controlvm_channel_guid = VISOR_CONTROLVM_CHANNEL_GUID;
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#define POLLJIFFIES_CONTROLVM_FAST 1
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#define POLLJIFFIES_CONTROLVM_SLOW 100
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#define MAX_CONTROLVM_PAYLOAD_BYTES (1024 * 128)
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#define UNISYS_VISOR_LEAF_ID 0x40000000
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/* The s-Par leaf ID returns "UnisysSpar64" encoded across ebx, ecx, edx */
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#define UNISYS_VISOR_ID_EBX 0x73696e55
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#define UNISYS_VISOR_ID_ECX 0x70537379
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#define UNISYS_VISOR_ID_EDX 0x34367261
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/*
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* When the controlvm channel is idle for at least MIN_IDLE_SECONDS, we switch
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* to slow polling mode. As soon as we get a controlvm message, we switch back
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* to fast polling mode.
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*/
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#define MIN_IDLE_SECONDS 10
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struct parser_context {
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unsigned long allocbytes;
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unsigned long param_bytes;
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u8 *curr;
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unsigned long bytes_remaining;
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bool byte_stream;
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struct visor_controlvm_parameters_header data;
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};
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/* VMCALL_CONTROLVM_ADDR: Used by all guests, not just IO. */
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#define VMCALL_CONTROLVM_ADDR 0x0501
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enum vmcall_result {
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VMCALL_RESULT_SUCCESS = 0,
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VMCALL_RESULT_INVALID_PARAM = 1,
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VMCALL_RESULT_DATA_UNAVAILABLE = 2,
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VMCALL_RESULT_FAILURE_UNAVAILABLE = 3,
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VMCALL_RESULT_DEVICE_ERROR = 4,
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VMCALL_RESULT_DEVICE_NOT_READY = 5
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};
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/*
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* struct vmcall_io_controlvm_addr_params - Structure for IO VMCALLS. Has
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* parameters to VMCALL_CONTROLVM_ADDR
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* interface.
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* @address: The Guest-relative physical address of the ControlVm channel.
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* This VMCall fills this in with the appropriate address.
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* Contents provided by this VMCALL (OUT).
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* @channel_bytes: The size of the ControlVm channel in bytes This VMCall fills
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* this in with the appropriate address. Contents provided by
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* this VMCALL (OUT).
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* @unused: Unused Bytes in the 64-Bit Aligned Struct.
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*/
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struct vmcall_io_controlvm_addr_params {
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u64 address;
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u32 channel_bytes;
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u8 unused[4];
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} __packed;
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struct visorchipset_device {
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struct acpi_device *acpi_device;
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unsigned long poll_jiffies;
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/* when we got our last controlvm message */
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unsigned long most_recent_message_jiffies;
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struct delayed_work periodic_controlvm_work;
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struct visorchannel *controlvm_channel;
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unsigned long controlvm_payload_bytes_buffered;
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/*
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* The following variables are used to handle the scenario where we are
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* unable to offload the payload from a controlvm message due to memory
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* requirements. In this scenario, we simply stash the controlvm
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* message, then attempt to process it again the next time
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* controlvm_periodic_work() runs.
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*/
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struct controlvm_message controlvm_pending_msg;
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bool controlvm_pending_msg_valid;
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struct vmcall_io_controlvm_addr_params controlvm_params;
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};
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static struct visorchipset_device *chipset_dev;
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struct parahotplug_request {
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struct list_head list;
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int id;
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unsigned long expiration;
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struct controlvm_message msg;
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};
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/* prototypes for attributes */
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static ssize_t toolaction_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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u8 tool_action = 0;
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int err;
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err = visorchannel_read(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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tool_action),
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&tool_action, sizeof(u8));
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if (err)
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return err;
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return sprintf(buf, "%u\n", tool_action);
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}
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static ssize_t toolaction_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u8 tool_action;
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int err;
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if (kstrtou8(buf, 10, &tool_action))
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return -EINVAL;
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err = visorchannel_write(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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tool_action),
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&tool_action, sizeof(u8));
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if (err)
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return err;
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return count;
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}
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static DEVICE_ATTR_RW(toolaction);
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static ssize_t boottotool_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct efi_visor_indication efi_visor_indication;
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int err;
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err = visorchannel_read(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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efi_visor_ind),
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&efi_visor_indication,
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sizeof(struct efi_visor_indication));
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if (err)
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return err;
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return sprintf(buf, "%u\n", efi_visor_indication.boot_to_tool);
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}
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static ssize_t boottotool_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int val, err;
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struct efi_visor_indication efi_visor_indication;
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if (kstrtoint(buf, 10, &val))
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return -EINVAL;
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efi_visor_indication.boot_to_tool = val;
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err = visorchannel_write(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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efi_visor_ind),
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&(efi_visor_indication),
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sizeof(struct efi_visor_indication));
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if (err)
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return err;
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return count;
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}
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static DEVICE_ATTR_RW(boottotool);
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static ssize_t error_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u32 error = 0;
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int err;
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err = visorchannel_read(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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installation_error),
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&error, sizeof(u32));
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if (err)
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return err;
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return sprintf(buf, "%u\n", error);
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}
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static ssize_t error_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u32 error;
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int err;
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if (kstrtou32(buf, 10, &error))
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return -EINVAL;
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err = visorchannel_write(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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installation_error),
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&error, sizeof(u32));
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if (err)
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return err;
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return count;
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}
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static DEVICE_ATTR_RW(error);
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static ssize_t textid_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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u32 text_id = 0;
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int err;
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err = visorchannel_read(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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installation_text_id),
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&text_id, sizeof(u32));
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if (err)
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return err;
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return sprintf(buf, "%u\n", text_id);
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}
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static ssize_t textid_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u32 text_id;
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int err;
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if (kstrtou32(buf, 10, &text_id))
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return -EINVAL;
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err = visorchannel_write(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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installation_text_id),
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&text_id, sizeof(u32));
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if (err)
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return err;
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return count;
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}
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static DEVICE_ATTR_RW(textid);
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static ssize_t remaining_steps_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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u16 remaining_steps = 0;
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int err;
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err = visorchannel_read(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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installation_remaining_steps),
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&remaining_steps, sizeof(u16));
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if (err)
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return err;
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return sprintf(buf, "%hu\n", remaining_steps);
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}
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static ssize_t remaining_steps_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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u16 remaining_steps;
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int err;
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if (kstrtou16(buf, 10, &remaining_steps))
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return -EINVAL;
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err = visorchannel_write(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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installation_remaining_steps),
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&remaining_steps, sizeof(u16));
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if (err)
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return err;
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return count;
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}
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static DEVICE_ATTR_RW(remaining_steps);
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static void controlvm_init_response(struct controlvm_message *msg,
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struct controlvm_message_header *msg_hdr,
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int response)
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{
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memset(msg, 0, sizeof(struct controlvm_message));
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memcpy(&msg->hdr, msg_hdr, sizeof(struct controlvm_message_header));
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msg->hdr.payload_bytes = 0;
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msg->hdr.payload_vm_offset = 0;
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msg->hdr.payload_max_bytes = 0;
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if (response < 0) {
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msg->hdr.flags.failed = 1;
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msg->hdr.completion_status = (u32)(-response);
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}
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}
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static int controlvm_respond_chipset_init(
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struct controlvm_message_header *msg_hdr,
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int response,
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enum visor_chipset_feature features)
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{
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struct controlvm_message outmsg;
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controlvm_init_response(&outmsg, msg_hdr, response);
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outmsg.cmd.init_chipset.features = features;
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return visorchannel_signalinsert(chipset_dev->controlvm_channel,
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CONTROLVM_QUEUE_REQUEST, &outmsg);
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}
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static int chipset_init(struct controlvm_message *inmsg)
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{
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static int chipset_inited;
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enum visor_chipset_feature features = 0;
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int rc = CONTROLVM_RESP_SUCCESS;
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int res = 0;
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if (chipset_inited) {
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rc = -CONTROLVM_RESP_ALREADY_DONE;
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res = -EIO;
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goto out_respond;
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}
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chipset_inited = 1;
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/*
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* Set features to indicate we support parahotplug (if Command also
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* supports it). Set the "reply" bit so Command knows this is a
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* features-aware driver.
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*/
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features = inmsg->cmd.init_chipset.features &
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VISOR_CHIPSET_FEATURE_PARA_HOTPLUG;
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features |= VISOR_CHIPSET_FEATURE_REPLY;
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out_respond:
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if (inmsg->hdr.flags.response_expected)
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res = controlvm_respond_chipset_init(&inmsg->hdr, rc, features);
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return res;
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}
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static int controlvm_respond(struct controlvm_message_header *msg_hdr,
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int response, struct visor_segment_state *state)
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{
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struct controlvm_message outmsg;
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controlvm_init_response(&outmsg, msg_hdr, response);
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if (outmsg.hdr.flags.test_message == 1)
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return -EINVAL;
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if (state) {
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outmsg.cmd.device_change_state.state = *state;
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outmsg.cmd.device_change_state.flags.phys_device = 1;
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}
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return visorchannel_signalinsert(chipset_dev->controlvm_channel,
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CONTROLVM_QUEUE_REQUEST, &outmsg);
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}
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enum crash_obj_type {
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CRASH_DEV,
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CRASH_BUS,
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};
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static int save_crash_message(struct controlvm_message *msg,
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enum crash_obj_type cr_type)
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{
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u32 local_crash_msg_offset;
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u16 local_crash_msg_count;
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int err;
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err = visorchannel_read(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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saved_crash_message_count),
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&local_crash_msg_count, sizeof(u16));
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if (err) {
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dev_err(&chipset_dev->acpi_device->dev,
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"failed to read message count\n");
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return err;
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}
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if (local_crash_msg_count != CONTROLVM_CRASHMSG_MAX) {
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dev_err(&chipset_dev->acpi_device->dev,
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"invalid number of messages\n");
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return -EIO;
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}
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err = visorchannel_read(chipset_dev->controlvm_channel,
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offsetof(struct visor_controlvm_channel,
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saved_crash_message_offset),
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&local_crash_msg_offset, sizeof(u32));
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if (err) {
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dev_err(&chipset_dev->acpi_device->dev,
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"failed to read offset\n");
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return err;
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}
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switch (cr_type) {
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case CRASH_DEV:
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local_crash_msg_offset += sizeof(struct controlvm_message);
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err = visorchannel_write(chipset_dev->controlvm_channel,
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local_crash_msg_offset, msg,
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sizeof(struct controlvm_message));
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if (err) {
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dev_err(&chipset_dev->acpi_device->dev,
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"failed to write dev msg\n");
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return err;
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}
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break;
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case CRASH_BUS:
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err = visorchannel_write(chipset_dev->controlvm_channel,
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local_crash_msg_offset, msg,
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sizeof(struct controlvm_message));
|
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if (err) {
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dev_err(&chipset_dev->acpi_device->dev,
|
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"failed to write bus msg\n");
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return err;
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}
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break;
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default:
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dev_err(&chipset_dev->acpi_device->dev,
|
|
"Invalid crash_obj_type\n");
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break;
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}
|
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return 0;
|
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}
|
|
|
|
static int controlvm_responder(enum controlvm_id cmd_id,
|
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struct controlvm_message_header *pending_msg_hdr,
|
|
int response)
|
|
{
|
|
if (pending_msg_hdr->id != (u32)cmd_id)
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return -EINVAL;
|
|
|
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return controlvm_respond(pending_msg_hdr, response, NULL);
|
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}
|
|
|
|
static int device_changestate_responder(enum controlvm_id cmd_id,
|
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struct visor_device *p, int response,
|
|
struct visor_segment_state state)
|
|
{
|
|
struct controlvm_message outmsg;
|
|
|
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if (p->pending_msg_hdr->id != cmd_id)
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return -EINVAL;
|
|
|
|
controlvm_init_response(&outmsg, p->pending_msg_hdr, response);
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outmsg.cmd.device_change_state.bus_no = p->chipset_bus_no;
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outmsg.cmd.device_change_state.dev_no = p->chipset_dev_no;
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outmsg.cmd.device_change_state.state = state;
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return visorchannel_signalinsert(chipset_dev->controlvm_channel,
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CONTROLVM_QUEUE_REQUEST, &outmsg);
|
|
}
|
|
|
|
static int visorbus_create(struct controlvm_message *inmsg)
|
|
{
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|
struct controlvm_message_packet *cmd = &inmsg->cmd;
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struct controlvm_message_header *pmsg_hdr;
|
|
u32 bus_no = cmd->create_bus.bus_no;
|
|
struct visor_device *bus_info;
|
|
struct visorchannel *visorchannel;
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|
int err;
|
|
|
|
bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
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if (bus_info && bus_info->state.created == 1) {
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dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed %s: already exists\n", __func__);
|
|
err = -EEXIST;
|
|
goto err_respond;
|
|
}
|
|
bus_info = kzalloc(sizeof(*bus_info), GFP_KERNEL);
|
|
if (!bus_info) {
|
|
err = -ENOMEM;
|
|
goto err_respond;
|
|
}
|
|
INIT_LIST_HEAD(&bus_info->list_all);
|
|
bus_info->chipset_bus_no = bus_no;
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|
bus_info->chipset_dev_no = BUS_ROOT_DEVICE;
|
|
if (guid_equal(&cmd->create_bus.bus_inst_guid, &visor_siovm_guid)) {
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|
err = save_crash_message(inmsg, CRASH_BUS);
|
|
if (err)
|
|
goto err_free_bus_info;
|
|
}
|
|
if (inmsg->hdr.flags.response_expected == 1) {
|
|
pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
|
|
if (!pmsg_hdr) {
|
|
err = -ENOMEM;
|
|
goto err_free_bus_info;
|
|
}
|
|
memcpy(pmsg_hdr, &inmsg->hdr,
|
|
sizeof(struct controlvm_message_header));
|
|
bus_info->pending_msg_hdr = pmsg_hdr;
|
|
}
|
|
visorchannel = visorchannel_create(cmd->create_bus.channel_addr,
|
|
GFP_KERNEL,
|
|
&cmd->create_bus.bus_data_type_guid,
|
|
false);
|
|
if (!visorchannel) {
|
|
err = -ENOMEM;
|
|
goto err_free_pending_msg;
|
|
}
|
|
bus_info->visorchannel = visorchannel;
|
|
/* Response will be handled by visorbus_create_instance on success */
|
|
err = visorbus_create_instance(bus_info);
|
|
if (err)
|
|
goto err_destroy_channel;
|
|
return 0;
|
|
|
|
err_destroy_channel:
|
|
visorchannel_destroy(visorchannel);
|
|
|
|
err_free_pending_msg:
|
|
kfree(bus_info->pending_msg_hdr);
|
|
|
|
err_free_bus_info:
|
|
kfree(bus_info);
|
|
|
|
err_respond:
|
|
if (inmsg->hdr.flags.response_expected == 1)
|
|
controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
|
|
return err;
|
|
}
|
|
|
|
static int visorbus_destroy(struct controlvm_message *inmsg)
|
|
{
|
|
struct controlvm_message_header *pmsg_hdr;
|
|
u32 bus_no = inmsg->cmd.destroy_bus.bus_no;
|
|
struct visor_device *bus_info;
|
|
int err;
|
|
|
|
bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
|
|
if (!bus_info) {
|
|
err = -ENODEV;
|
|
goto err_respond;
|
|
}
|
|
if (bus_info->state.created == 0) {
|
|
err = -ENOENT;
|
|
goto err_respond;
|
|
}
|
|
if (bus_info->pending_msg_hdr) {
|
|
/* only non-NULL if dev is still waiting on a response */
|
|
err = -EEXIST;
|
|
goto err_respond;
|
|
}
|
|
if (inmsg->hdr.flags.response_expected == 1) {
|
|
pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
|
|
if (!pmsg_hdr) {
|
|
err = -ENOMEM;
|
|
goto err_respond;
|
|
}
|
|
memcpy(pmsg_hdr, &inmsg->hdr,
|
|
sizeof(struct controlvm_message_header));
|
|
bus_info->pending_msg_hdr = pmsg_hdr;
|
|
}
|
|
/* Response will be handled by visorbus_remove_instance */
|
|
visorbus_remove_instance(bus_info);
|
|
return 0;
|
|
|
|
err_respond:
|
|
if (inmsg->hdr.flags.response_expected == 1)
|
|
controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
|
|
return err;
|
|
}
|
|
|
|
static const guid_t *parser_id_get(struct parser_context *ctx)
|
|
{
|
|
return &ctx->data.id;
|
|
}
|
|
|
|
static void *parser_string_get(u8 *pscan, int nscan)
|
|
{
|
|
int value_length;
|
|
void *value;
|
|
|
|
if (nscan == 0)
|
|
return NULL;
|
|
|
|
value_length = strnlen(pscan, nscan);
|
|
value = kzalloc(value_length + 1, GFP_KERNEL);
|
|
if (!value)
|
|
return NULL;
|
|
if (value_length > 0)
|
|
memcpy(value, pscan, value_length);
|
|
return value;
|
|
}
|
|
|
|
static void *parser_name_get(struct parser_context *ctx)
|
|
{
|
|
struct visor_controlvm_parameters_header *phdr;
|
|
|
|
phdr = &ctx->data;
|
|
if ((unsigned long)phdr->name_offset +
|
|
(unsigned long)phdr->name_length > ctx->param_bytes)
|
|
return NULL;
|
|
ctx->curr = (char *)&phdr + phdr->name_offset;
|
|
ctx->bytes_remaining = phdr->name_length;
|
|
return parser_string_get(ctx->curr, phdr->name_length);
|
|
}
|
|
|
|
static int visorbus_configure(struct controlvm_message *inmsg,
|
|
struct parser_context *parser_ctx)
|
|
{
|
|
struct controlvm_message_packet *cmd = &inmsg->cmd;
|
|
u32 bus_no;
|
|
struct visor_device *bus_info;
|
|
int err = 0;
|
|
|
|
bus_no = cmd->configure_bus.bus_no;
|
|
bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
|
|
if (!bus_info) {
|
|
err = -EINVAL;
|
|
goto err_respond;
|
|
}
|
|
if (bus_info->state.created == 0) {
|
|
err = -EINVAL;
|
|
goto err_respond;
|
|
}
|
|
if (bus_info->pending_msg_hdr) {
|
|
err = -EIO;
|
|
goto err_respond;
|
|
}
|
|
err = visorchannel_set_clientpartition(bus_info->visorchannel,
|
|
cmd->configure_bus.guest_handle);
|
|
if (err)
|
|
goto err_respond;
|
|
if (parser_ctx) {
|
|
const guid_t *partition_guid = parser_id_get(parser_ctx);
|
|
|
|
guid_copy(&bus_info->partition_guid, partition_guid);
|
|
bus_info->name = parser_name_get(parser_ctx);
|
|
}
|
|
if (inmsg->hdr.flags.response_expected == 1)
|
|
controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
|
|
return 0;
|
|
|
|
err_respond:
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"%s exited with err: %d\n", __func__, err);
|
|
if (inmsg->hdr.flags.response_expected == 1)
|
|
controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
|
|
return err;
|
|
}
|
|
|
|
static int visorbus_device_create(struct controlvm_message *inmsg)
|
|
{
|
|
struct controlvm_message_packet *cmd = &inmsg->cmd;
|
|
struct controlvm_message_header *pmsg_hdr;
|
|
u32 bus_no = cmd->create_device.bus_no;
|
|
u32 dev_no = cmd->create_device.dev_no;
|
|
struct visor_device *dev_info;
|
|
struct visor_device *bus_info;
|
|
struct visorchannel *visorchannel;
|
|
int err;
|
|
|
|
bus_info = visorbus_get_device_by_id(bus_no, BUS_ROOT_DEVICE, NULL);
|
|
if (!bus_info) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed to get bus by id: %d\n", bus_no);
|
|
err = -ENODEV;
|
|
goto err_respond;
|
|
}
|
|
if (bus_info->state.created == 0) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"bus not created, id: %d\n", bus_no);
|
|
err = -EINVAL;
|
|
goto err_respond;
|
|
}
|
|
dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
|
|
if (dev_info && dev_info->state.created == 1) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed to get bus by id: %d/%d\n", bus_no, dev_no);
|
|
err = -EEXIST;
|
|
goto err_respond;
|
|
}
|
|
|
|
dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
|
|
if (!dev_info) {
|
|
err = -ENOMEM;
|
|
goto err_respond;
|
|
}
|
|
dev_info->chipset_bus_no = bus_no;
|
|
dev_info->chipset_dev_no = dev_no;
|
|
guid_copy(&dev_info->inst, &cmd->create_device.dev_inst_guid);
|
|
dev_info->device.parent = &bus_info->device;
|
|
visorchannel = visorchannel_create(cmd->create_device.channel_addr,
|
|
GFP_KERNEL,
|
|
&cmd->create_device.data_type_guid,
|
|
true);
|
|
if (!visorchannel) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed to create visorchannel: %d/%d\n",
|
|
bus_no, dev_no);
|
|
err = -ENOMEM;
|
|
goto err_free_dev_info;
|
|
}
|
|
dev_info->visorchannel = visorchannel;
|
|
guid_copy(&dev_info->channel_type_guid,
|
|
&cmd->create_device.data_type_guid);
|
|
if (guid_equal(&cmd->create_device.data_type_guid,
|
|
&visor_vhba_channel_guid)) {
|
|
err = save_crash_message(inmsg, CRASH_DEV);
|
|
if (err)
|
|
goto err_destroy_visorchannel;
|
|
}
|
|
if (inmsg->hdr.flags.response_expected == 1) {
|
|
pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
|
|
if (!pmsg_hdr) {
|
|
err = -ENOMEM;
|
|
goto err_destroy_visorchannel;
|
|
}
|
|
memcpy(pmsg_hdr, &inmsg->hdr,
|
|
sizeof(struct controlvm_message_header));
|
|
dev_info->pending_msg_hdr = pmsg_hdr;
|
|
}
|
|
/* create_visor_device will send response */
|
|
err = create_visor_device(dev_info);
|
|
if (err)
|
|
goto err_destroy_visorchannel;
|
|
|
|
return 0;
|
|
|
|
err_destroy_visorchannel:
|
|
visorchannel_destroy(visorchannel);
|
|
|
|
err_free_dev_info:
|
|
kfree(dev_info);
|
|
|
|
err_respond:
|
|
if (inmsg->hdr.flags.response_expected == 1)
|
|
controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
|
|
return err;
|
|
}
|
|
|
|
static int visorbus_device_changestate(struct controlvm_message *inmsg)
|
|
{
|
|
struct controlvm_message_packet *cmd = &inmsg->cmd;
|
|
struct controlvm_message_header *pmsg_hdr;
|
|
u32 bus_no = cmd->device_change_state.bus_no;
|
|
u32 dev_no = cmd->device_change_state.dev_no;
|
|
struct visor_segment_state state = cmd->device_change_state.state;
|
|
struct visor_device *dev_info;
|
|
int err = 0;
|
|
|
|
dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
|
|
if (!dev_info) {
|
|
err = -ENODEV;
|
|
goto err_respond;
|
|
}
|
|
if (dev_info->state.created == 0) {
|
|
err = -EINVAL;
|
|
goto err_respond;
|
|
}
|
|
if (dev_info->pending_msg_hdr) {
|
|
/* only non-NULL if dev is still waiting on a response */
|
|
err = -EIO;
|
|
goto err_respond;
|
|
}
|
|
|
|
if (inmsg->hdr.flags.response_expected == 1) {
|
|
pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
|
|
if (!pmsg_hdr) {
|
|
err = -ENOMEM;
|
|
goto err_respond;
|
|
}
|
|
memcpy(pmsg_hdr, &inmsg->hdr,
|
|
sizeof(struct controlvm_message_header));
|
|
dev_info->pending_msg_hdr = pmsg_hdr;
|
|
}
|
|
if (state.alive == segment_state_running.alive &&
|
|
state.operating == segment_state_running.operating)
|
|
/* Response will be sent from visorchipset_device_resume */
|
|
err = visorchipset_device_resume(dev_info);
|
|
/* ServerNotReady / ServerLost / SegmentStateStandby */
|
|
else if (state.alive == segment_state_standby.alive &&
|
|
state.operating == segment_state_standby.operating)
|
|
/*
|
|
* technically this is standby case where server is lost.
|
|
* Response will be sent from visorchipset_device_pause.
|
|
*/
|
|
err = visorchipset_device_pause(dev_info);
|
|
if (err)
|
|
goto err_respond;
|
|
return 0;
|
|
|
|
err_respond:
|
|
dev_err(&chipset_dev->acpi_device->dev, "failed: %d\n", err);
|
|
if (inmsg->hdr.flags.response_expected == 1)
|
|
controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
|
|
return err;
|
|
}
|
|
|
|
static int visorbus_device_destroy(struct controlvm_message *inmsg)
|
|
{
|
|
struct controlvm_message_packet *cmd = &inmsg->cmd;
|
|
struct controlvm_message_header *pmsg_hdr;
|
|
u32 bus_no = cmd->destroy_device.bus_no;
|
|
u32 dev_no = cmd->destroy_device.dev_no;
|
|
struct visor_device *dev_info;
|
|
int err;
|
|
|
|
dev_info = visorbus_get_device_by_id(bus_no, dev_no, NULL);
|
|
if (!dev_info) {
|
|
err = -ENODEV;
|
|
goto err_respond;
|
|
}
|
|
if (dev_info->state.created == 0) {
|
|
err = -EINVAL;
|
|
goto err_respond;
|
|
}
|
|
if (dev_info->pending_msg_hdr) {
|
|
/* only non-NULL if dev is still waiting on a response */
|
|
err = -EIO;
|
|
goto err_respond;
|
|
}
|
|
if (inmsg->hdr.flags.response_expected == 1) {
|
|
pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
|
|
if (!pmsg_hdr) {
|
|
err = -ENOMEM;
|
|
goto err_respond;
|
|
}
|
|
|
|
memcpy(pmsg_hdr, &inmsg->hdr,
|
|
sizeof(struct controlvm_message_header));
|
|
dev_info->pending_msg_hdr = pmsg_hdr;
|
|
}
|
|
kfree(dev_info->name);
|
|
remove_visor_device(dev_info);
|
|
return 0;
|
|
|
|
err_respond:
|
|
if (inmsg->hdr.flags.response_expected == 1)
|
|
controlvm_responder(inmsg->hdr.id, &inmsg->hdr, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The general parahotplug flow works as follows. The visorchipset receives
|
|
* a DEVICE_CHANGESTATE message from Command specifying a physical device
|
|
* to enable or disable. The CONTROLVM message handler calls
|
|
* parahotplug_process_message, which then adds the message to a global list
|
|
* and kicks off a udev event which causes a user level script to enable or
|
|
* disable the specified device. The udev script then writes to
|
|
* /sys/devices/platform/visorchipset/parahotplug, which causes the
|
|
* parahotplug store functions to get called, at which point the
|
|
* appropriate CONTROLVM message is retrieved from the list and responded to.
|
|
*/
|
|
|
|
#define PARAHOTPLUG_TIMEOUT_MS 2000
|
|
|
|
/*
|
|
* parahotplug_next_id() - generate unique int to match an outstanding
|
|
* CONTROLVM message with a udev script /sys
|
|
* response
|
|
*
|
|
* Return: a unique integer value
|
|
*/
|
|
static int parahotplug_next_id(void)
|
|
{
|
|
static atomic_t id = ATOMIC_INIT(0);
|
|
|
|
return atomic_inc_return(&id);
|
|
}
|
|
|
|
/*
|
|
* parahotplug_next_expiration() - returns the time (in jiffies) when a
|
|
* CONTROLVM message on the list should expire
|
|
* -- PARAHOTPLUG_TIMEOUT_MS in the future
|
|
*
|
|
* Return: expected expiration time (in jiffies)
|
|
*/
|
|
static unsigned long parahotplug_next_expiration(void)
|
|
{
|
|
return jiffies + msecs_to_jiffies(PARAHOTPLUG_TIMEOUT_MS);
|
|
}
|
|
|
|
/*
|
|
* parahotplug_request_create() - create a parahotplug_request, which is
|
|
* basically a wrapper for a CONTROLVM_MESSAGE
|
|
* that we can stick on a list
|
|
* @msg: the message to insert in the request
|
|
*
|
|
* Return: the request containing the provided message
|
|
*/
|
|
static struct parahotplug_request *parahotplug_request_create(
|
|
struct controlvm_message *msg)
|
|
{
|
|
struct parahotplug_request *req;
|
|
|
|
req = kmalloc(sizeof(*req), GFP_KERNEL);
|
|
if (!req)
|
|
return NULL;
|
|
req->id = parahotplug_next_id();
|
|
req->expiration = parahotplug_next_expiration();
|
|
req->msg = *msg;
|
|
return req;
|
|
}
|
|
|
|
/*
|
|
* parahotplug_request_destroy() - free a parahotplug_request
|
|
* @req: the request to deallocate
|
|
*/
|
|
static void parahotplug_request_destroy(struct parahotplug_request *req)
|
|
{
|
|
kfree(req);
|
|
}
|
|
|
|
static LIST_HEAD(parahotplug_request_list);
|
|
/* lock for above */
|
|
static DEFINE_SPINLOCK(parahotplug_request_list_lock);
|
|
|
|
/*
|
|
* parahotplug_request_complete() - mark request as complete
|
|
* @id: the id of the request
|
|
* @active: indicates whether the request is assigned to active partition
|
|
*
|
|
* Called from the /sys handler, which means the user script has
|
|
* finished the enable/disable. Find the matching identifier, and
|
|
* respond to the CONTROLVM message with success.
|
|
*
|
|
* Return: 0 on success or -EINVAL on failure
|
|
*/
|
|
static int parahotplug_request_complete(int id, u16 active)
|
|
{
|
|
struct list_head *pos;
|
|
struct list_head *tmp;
|
|
struct parahotplug_request *req;
|
|
|
|
spin_lock(¶hotplug_request_list_lock);
|
|
/* Look for a request matching "id". */
|
|
list_for_each_safe(pos, tmp, ¶hotplug_request_list) {
|
|
req = list_entry(pos, struct parahotplug_request, list);
|
|
if (req->id == id) {
|
|
/*
|
|
* Found a match. Remove it from the list and
|
|
* respond.
|
|
*/
|
|
list_del(pos);
|
|
spin_unlock(¶hotplug_request_list_lock);
|
|
req->msg.cmd.device_change_state.state.active = active;
|
|
if (req->msg.hdr.flags.response_expected)
|
|
controlvm_respond(
|
|
&req->msg.hdr, CONTROLVM_RESP_SUCCESS,
|
|
&req->msg.cmd.device_change_state.state);
|
|
parahotplug_request_destroy(req);
|
|
return 0;
|
|
}
|
|
}
|
|
spin_unlock(¶hotplug_request_list_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* devicedisabled_store() - disables the hotplug device
|
|
* @dev: sysfs interface variable not utilized in this function
|
|
* @attr: sysfs interface variable not utilized in this function
|
|
* @buf: buffer containing the device id
|
|
* @count: the size of the buffer
|
|
*
|
|
* The parahotplug/devicedisabled interface gets called by our support script
|
|
* when an SR-IOV device has been shut down. The ID is passed to the script
|
|
* and then passed back when the device has been removed.
|
|
*
|
|
* Return: the size of the buffer for success or negative for error
|
|
*/
|
|
static ssize_t devicedisabled_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned int id;
|
|
int err;
|
|
|
|
if (kstrtouint(buf, 10, &id))
|
|
return -EINVAL;
|
|
err = parahotplug_request_complete(id, 0);
|
|
if (err < 0)
|
|
return err;
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_WO(devicedisabled);
|
|
|
|
/*
|
|
* deviceenabled_store() - enables the hotplug device
|
|
* @dev: sysfs interface variable not utilized in this function
|
|
* @attr: sysfs interface variable not utilized in this function
|
|
* @buf: buffer containing the device id
|
|
* @count: the size of the buffer
|
|
*
|
|
* The parahotplug/deviceenabled interface gets called by our support script
|
|
* when an SR-IOV device has been recovered. The ID is passed to the script
|
|
* and then passed back when the device has been brought back up.
|
|
*
|
|
* Return: the size of the buffer for success or negative for error
|
|
*/
|
|
static ssize_t deviceenabled_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned int id;
|
|
|
|
if (kstrtouint(buf, 10, &id))
|
|
return -EINVAL;
|
|
parahotplug_request_complete(id, 1);
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR_WO(deviceenabled);
|
|
|
|
static struct attribute *visorchipset_install_attrs[] = {
|
|
&dev_attr_toolaction.attr,
|
|
&dev_attr_boottotool.attr,
|
|
&dev_attr_error.attr,
|
|
&dev_attr_textid.attr,
|
|
&dev_attr_remaining_steps.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group visorchipset_install_group = {
|
|
.name = "install",
|
|
.attrs = visorchipset_install_attrs
|
|
};
|
|
|
|
static struct attribute *visorchipset_parahotplug_attrs[] = {
|
|
&dev_attr_devicedisabled.attr,
|
|
&dev_attr_deviceenabled.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group visorchipset_parahotplug_group = {
|
|
.name = "parahotplug",
|
|
.attrs = visorchipset_parahotplug_attrs
|
|
};
|
|
|
|
static const struct attribute_group *visorchipset_dev_groups[] = {
|
|
&visorchipset_install_group,
|
|
&visorchipset_parahotplug_group,
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* parahotplug_request_kickoff() - initiate parahotplug request
|
|
* @req: the request to initiate
|
|
*
|
|
* Cause uevent to run the user level script to do the disable/enable specified
|
|
* in the parahotplug_request.
|
|
*/
|
|
static int parahotplug_request_kickoff(struct parahotplug_request *req)
|
|
{
|
|
struct controlvm_message_packet *cmd = &req->msg.cmd;
|
|
char env_cmd[40], env_id[40], env_state[40], env_bus[40], env_dev[40],
|
|
env_func[40];
|
|
char *envp[] = { env_cmd, env_id, env_state, env_bus, env_dev,
|
|
env_func, NULL
|
|
};
|
|
|
|
sprintf(env_cmd, "VISOR_PARAHOTPLUG=1");
|
|
sprintf(env_id, "VISOR_PARAHOTPLUG_ID=%d", req->id);
|
|
sprintf(env_state, "VISOR_PARAHOTPLUG_STATE=%d",
|
|
cmd->device_change_state.state.active);
|
|
sprintf(env_bus, "VISOR_PARAHOTPLUG_BUS=%d",
|
|
cmd->device_change_state.bus_no);
|
|
sprintf(env_dev, "VISOR_PARAHOTPLUG_DEVICE=%d",
|
|
cmd->device_change_state.dev_no >> 3);
|
|
sprintf(env_func, "VISOR_PARAHOTPLUG_FUNCTION=%d",
|
|
cmd->device_change_state.dev_no & 0x7);
|
|
return kobject_uevent_env(&chipset_dev->acpi_device->dev.kobj,
|
|
KOBJ_CHANGE, envp);
|
|
}
|
|
|
|
/*
|
|
* parahotplug_process_message() - enables or disables a PCI device by kicking
|
|
* off a udev script
|
|
* @inmsg: the message indicating whether to enable or disable
|
|
*/
|
|
static int parahotplug_process_message(struct controlvm_message *inmsg)
|
|
{
|
|
struct parahotplug_request *req;
|
|
int err;
|
|
|
|
req = parahotplug_request_create(inmsg);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
/*
|
|
* For enable messages, just respond with success right away, we don't
|
|
* need to wait to see if the enable was successful.
|
|
*/
|
|
if (inmsg->cmd.device_change_state.state.active) {
|
|
err = parahotplug_request_kickoff(req);
|
|
if (err)
|
|
goto err_respond;
|
|
controlvm_respond(&inmsg->hdr, CONTROLVM_RESP_SUCCESS,
|
|
&inmsg->cmd.device_change_state.state);
|
|
parahotplug_request_destroy(req);
|
|
return 0;
|
|
}
|
|
/*
|
|
* For disable messages, add the request to the request list before
|
|
* kicking off the udev script. It won't get responded to until the
|
|
* script has indicated it's done.
|
|
*/
|
|
spin_lock(¶hotplug_request_list_lock);
|
|
list_add_tail(&req->list, ¶hotplug_request_list);
|
|
spin_unlock(¶hotplug_request_list_lock);
|
|
err = parahotplug_request_kickoff(req);
|
|
if (err)
|
|
goto err_respond;
|
|
return 0;
|
|
|
|
err_respond:
|
|
controlvm_respond(&inmsg->hdr, err,
|
|
&inmsg->cmd.device_change_state.state);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* chipset_ready_uevent() - sends chipset_ready action
|
|
*
|
|
* Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset.
|
|
*
|
|
* Return: 0 on success, negative on failure
|
|
*/
|
|
static int chipset_ready_uevent(struct controlvm_message_header *msg_hdr)
|
|
{
|
|
int res;
|
|
|
|
res = kobject_uevent(&chipset_dev->acpi_device->dev.kobj, KOBJ_ONLINE);
|
|
if (msg_hdr->flags.response_expected)
|
|
controlvm_respond(msg_hdr, res, NULL);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* chipset_selftest_uevent() - sends chipset_selftest action
|
|
*
|
|
* Send ACTION=online for DEVPATH=/sys/devices/platform/visorchipset.
|
|
*
|
|
* Return: 0 on success, negative on failure
|
|
*/
|
|
static int chipset_selftest_uevent(struct controlvm_message_header *msg_hdr)
|
|
{
|
|
char env_selftest[20];
|
|
char *envp[] = { env_selftest, NULL };
|
|
int res;
|
|
|
|
sprintf(env_selftest, "SPARSP_SELFTEST=%d", 1);
|
|
res = kobject_uevent_env(&chipset_dev->acpi_device->dev.kobj,
|
|
KOBJ_CHANGE, envp);
|
|
if (msg_hdr->flags.response_expected)
|
|
controlvm_respond(msg_hdr, res, NULL);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* chipset_notready_uevent() - sends chipset_notready action
|
|
*
|
|
* Send ACTION=offline for DEVPATH=/sys/devices/platform/visorchipset.
|
|
*
|
|
* Return: 0 on success, negative on failure
|
|
*/
|
|
static int chipset_notready_uevent(struct controlvm_message_header *msg_hdr)
|
|
{
|
|
int res = kobject_uevent(&chipset_dev->acpi_device->dev.kobj,
|
|
KOBJ_OFFLINE);
|
|
|
|
if (msg_hdr->flags.response_expected)
|
|
controlvm_respond(msg_hdr, res, NULL);
|
|
return res;
|
|
}
|
|
|
|
static int unisys_vmcall(unsigned long tuple, unsigned long param)
|
|
{
|
|
int result = 0;
|
|
unsigned int cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx;
|
|
unsigned long reg_ebx;
|
|
unsigned long reg_ecx;
|
|
|
|
reg_ebx = param & 0xFFFFFFFF;
|
|
reg_ecx = param >> 32;
|
|
cpuid(0x00000001, &cpuid_eax, &cpuid_ebx, &cpuid_ecx, &cpuid_edx);
|
|
if (!(cpuid_ecx & 0x80000000))
|
|
return -EPERM;
|
|
__asm__ __volatile__(".byte 0x00f, 0x001, 0x0c1" : "=a"(result) :
|
|
"a"(tuple), "b"(reg_ebx), "c"(reg_ecx));
|
|
if (result)
|
|
goto error;
|
|
return 0;
|
|
|
|
/* Need to convert from VMCALL error codes to Linux */
|
|
error:
|
|
switch (result) {
|
|
case VMCALL_RESULT_INVALID_PARAM:
|
|
return -EINVAL;
|
|
case VMCALL_RESULT_DATA_UNAVAILABLE:
|
|
return -ENODEV;
|
|
default:
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
|
|
static int controlvm_channel_create(struct visorchipset_device *dev)
|
|
{
|
|
struct visorchannel *chan;
|
|
u64 addr;
|
|
int err;
|
|
|
|
err = unisys_vmcall(VMCALL_CONTROLVM_ADDR,
|
|
virt_to_phys(&dev->controlvm_params));
|
|
if (err)
|
|
return err;
|
|
addr = dev->controlvm_params.address;
|
|
chan = visorchannel_create(addr, GFP_KERNEL,
|
|
&visor_controlvm_channel_guid, true);
|
|
if (!chan)
|
|
return -ENOMEM;
|
|
dev->controlvm_channel = chan;
|
|
return 0;
|
|
}
|
|
|
|
static void setup_crash_devices_work_queue(struct work_struct *work)
|
|
{
|
|
struct controlvm_message local_crash_bus_msg;
|
|
struct controlvm_message local_crash_dev_msg;
|
|
struct controlvm_message msg = {
|
|
.hdr.id = CONTROLVM_CHIPSET_INIT,
|
|
.cmd.init_chipset = {
|
|
.bus_count = 23,
|
|
.switch_count = 0,
|
|
},
|
|
};
|
|
u32 local_crash_msg_offset;
|
|
u16 local_crash_msg_count;
|
|
|
|
/* send init chipset msg */
|
|
chipset_init(&msg);
|
|
/* get saved message count */
|
|
if (visorchannel_read(chipset_dev->controlvm_channel,
|
|
offsetof(struct visor_controlvm_channel,
|
|
saved_crash_message_count),
|
|
&local_crash_msg_count, sizeof(u16)) < 0) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed to read channel\n");
|
|
return;
|
|
}
|
|
if (local_crash_msg_count != CONTROLVM_CRASHMSG_MAX) {
|
|
dev_err(&chipset_dev->acpi_device->dev, "invalid count\n");
|
|
return;
|
|
}
|
|
/* get saved crash message offset */
|
|
if (visorchannel_read(chipset_dev->controlvm_channel,
|
|
offsetof(struct visor_controlvm_channel,
|
|
saved_crash_message_offset),
|
|
&local_crash_msg_offset, sizeof(u32)) < 0) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed to read channel\n");
|
|
return;
|
|
}
|
|
/* read create device message for storage bus offset */
|
|
if (visorchannel_read(chipset_dev->controlvm_channel,
|
|
local_crash_msg_offset,
|
|
&local_crash_bus_msg,
|
|
sizeof(struct controlvm_message)) < 0) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed to read channel\n");
|
|
return;
|
|
}
|
|
/* read create device message for storage device */
|
|
if (visorchannel_read(chipset_dev->controlvm_channel,
|
|
local_crash_msg_offset +
|
|
sizeof(struct controlvm_message),
|
|
&local_crash_dev_msg,
|
|
sizeof(struct controlvm_message)) < 0) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"failed to read channel\n");
|
|
return;
|
|
}
|
|
/* reuse IOVM create bus message */
|
|
if (!local_crash_bus_msg.cmd.create_bus.channel_addr) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"no valid create_bus message\n");
|
|
return;
|
|
}
|
|
visorbus_create(&local_crash_bus_msg);
|
|
/* reuse create device message for storage device */
|
|
if (!local_crash_dev_msg.cmd.create_device.channel_addr) {
|
|
dev_err(&chipset_dev->acpi_device->dev,
|
|
"no valid create_device message\n");
|
|
return;
|
|
}
|
|
visorbus_device_create(&local_crash_dev_msg);
|
|
}
|
|
|
|
void visorbus_response(struct visor_device *bus_info, int response,
|
|
int controlvm_id)
|
|
{
|
|
if (!bus_info->pending_msg_hdr)
|
|
return;
|
|
|
|
controlvm_responder(controlvm_id, bus_info->pending_msg_hdr, response);
|
|
kfree(bus_info->pending_msg_hdr);
|
|
bus_info->pending_msg_hdr = NULL;
|
|
}
|
|
|
|
void visorbus_device_changestate_response(struct visor_device *dev_info,
|
|
int response,
|
|
struct visor_segment_state state)
|
|
{
|
|
if (!dev_info->pending_msg_hdr)
|
|
return;
|
|
|
|
device_changestate_responder(CONTROLVM_DEVICE_CHANGESTATE, dev_info,
|
|
response, state);
|
|
kfree(dev_info->pending_msg_hdr);
|
|
dev_info->pending_msg_hdr = NULL;
|
|
}
|
|
|
|
static void parser_done(struct parser_context *ctx)
|
|
{
|
|
chipset_dev->controlvm_payload_bytes_buffered -= ctx->param_bytes;
|
|
kfree(ctx);
|
|
}
|
|
|
|
static struct parser_context *parser_init_stream(u64 addr, u32 bytes,
|
|
bool *retry)
|
|
{
|
|
unsigned long allocbytes;
|
|
struct parser_context *ctx;
|
|
void *mapping;
|
|
|
|
*retry = false;
|
|
/* alloc an extra byte to ensure payload is \0 terminated */
|
|
allocbytes = (unsigned long)bytes + 1 + (sizeof(struct parser_context) -
|
|
sizeof(struct visor_controlvm_parameters_header));
|
|
if ((chipset_dev->controlvm_payload_bytes_buffered + bytes) >
|
|
MAX_CONTROLVM_PAYLOAD_BYTES) {
|
|
*retry = true;
|
|
return NULL;
|
|
}
|
|
ctx = kzalloc(allocbytes, GFP_KERNEL);
|
|
if (!ctx) {
|
|
*retry = true;
|
|
return NULL;
|
|
}
|
|
ctx->allocbytes = allocbytes;
|
|
ctx->param_bytes = bytes;
|
|
mapping = memremap(addr, bytes, MEMREMAP_WB);
|
|
if (!mapping)
|
|
goto err_finish_ctx;
|
|
memcpy(&ctx->data, mapping, bytes);
|
|
memunmap(mapping);
|
|
ctx->byte_stream = true;
|
|
chipset_dev->controlvm_payload_bytes_buffered += ctx->param_bytes;
|
|
return ctx;
|
|
|
|
err_finish_ctx:
|
|
kfree(ctx);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* handle_command() - process a controlvm message
|
|
* @inmsg: the message to process
|
|
* @channel_addr: address of the controlvm channel
|
|
*
|
|
* Return:
|
|
* 0 - Successfully processed the message
|
|
* -EAGAIN - ControlVM message was not processed and should be retried
|
|
* reading the next controlvm message; a scenario where this can
|
|
* occur is when we need to throttle the allocation of memory in
|
|
* which to copy out controlvm payload data.
|
|
* < 0 - error: ControlVM message was processed but an error occurred.
|
|
*/
|
|
static int handle_command(struct controlvm_message inmsg, u64 channel_addr)
|
|
{
|
|
struct controlvm_message_packet *cmd = &inmsg.cmd;
|
|
u64 parm_addr;
|
|
u32 parm_bytes;
|
|
struct parser_context *parser_ctx = NULL;
|
|
struct controlvm_message ackmsg;
|
|
int err = 0;
|
|
|
|
/* create parsing context if necessary */
|
|
parm_addr = channel_addr + inmsg.hdr.payload_vm_offset;
|
|
parm_bytes = inmsg.hdr.payload_bytes;
|
|
/*
|
|
* Parameter and channel addresses within test messages actually lie
|
|
* within our OS-controlled memory. We need to know that, because it
|
|
* makes a difference in how we compute the virtual address.
|
|
*/
|
|
if (parm_bytes) {
|
|
bool retry;
|
|
|
|
parser_ctx = parser_init_stream(parm_addr, parm_bytes, &retry);
|
|
if (!parser_ctx && retry)
|
|
return -EAGAIN;
|
|
}
|
|
controlvm_init_response(&ackmsg, &inmsg.hdr, CONTROLVM_RESP_SUCCESS);
|
|
err = visorchannel_signalinsert(chipset_dev->controlvm_channel,
|
|
CONTROLVM_QUEUE_ACK, &ackmsg);
|
|
if (err)
|
|
return err;
|
|
switch (inmsg.hdr.id) {
|
|
case CONTROLVM_CHIPSET_INIT:
|
|
err = chipset_init(&inmsg);
|
|
break;
|
|
case CONTROLVM_BUS_CREATE:
|
|
err = visorbus_create(&inmsg);
|
|
break;
|
|
case CONTROLVM_BUS_DESTROY:
|
|
err = visorbus_destroy(&inmsg);
|
|
break;
|
|
case CONTROLVM_BUS_CONFIGURE:
|
|
err = visorbus_configure(&inmsg, parser_ctx);
|
|
break;
|
|
case CONTROLVM_DEVICE_CREATE:
|
|
err = visorbus_device_create(&inmsg);
|
|
break;
|
|
case CONTROLVM_DEVICE_CHANGESTATE:
|
|
if (cmd->device_change_state.flags.phys_device) {
|
|
err = parahotplug_process_message(&inmsg);
|
|
} else {
|
|
/*
|
|
* save the hdr and cmd structures for later use when
|
|
* sending back the response to Command
|
|
*/
|
|
err = visorbus_device_changestate(&inmsg);
|
|
break;
|
|
}
|
|
break;
|
|
case CONTROLVM_DEVICE_DESTROY:
|
|
err = visorbus_device_destroy(&inmsg);
|
|
break;
|
|
case CONTROLVM_DEVICE_CONFIGURE:
|
|
/* no op just send a respond that we passed */
|
|
if (inmsg.hdr.flags.response_expected)
|
|
controlvm_respond(&inmsg.hdr, CONTROLVM_RESP_SUCCESS,
|
|
NULL);
|
|
break;
|
|
case CONTROLVM_CHIPSET_READY:
|
|
err = chipset_ready_uevent(&inmsg.hdr);
|
|
break;
|
|
case CONTROLVM_CHIPSET_SELFTEST:
|
|
err = chipset_selftest_uevent(&inmsg.hdr);
|
|
break;
|
|
case CONTROLVM_CHIPSET_STOP:
|
|
err = chipset_notready_uevent(&inmsg.hdr);
|
|
break;
|
|
default:
|
|
err = -ENOMSG;
|
|
if (inmsg.hdr.flags.response_expected)
|
|
controlvm_respond(&inmsg.hdr,
|
|
-CONTROLVM_RESP_ID_UNKNOWN, NULL);
|
|
break;
|
|
}
|
|
if (parser_ctx) {
|
|
parser_done(parser_ctx);
|
|
parser_ctx = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* read_controlvm_event() - retreives the next message from the
|
|
* CONTROLVM_QUEUE_EVENT queue in the controlvm
|
|
* channel
|
|
* @msg: pointer to the retrieved message
|
|
*
|
|
* Return: 0 if valid message was retrieved or -error
|
|
*/
|
|
static int read_controlvm_event(struct controlvm_message *msg)
|
|
{
|
|
int err = visorchannel_signalremove(chipset_dev->controlvm_channel,
|
|
CONTROLVM_QUEUE_EVENT, msg);
|
|
|
|
if (err)
|
|
return err;
|
|
/* got a message */
|
|
if (msg->hdr.flags.test_message == 1)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* parahotplug_process_list() - remove any request from the list that's been on
|
|
* there too long and respond with an error
|
|
*/
|
|
static void parahotplug_process_list(void)
|
|
{
|
|
struct list_head *pos;
|
|
struct list_head *tmp;
|
|
|
|
spin_lock(¶hotplug_request_list_lock);
|
|
list_for_each_safe(pos, tmp, ¶hotplug_request_list) {
|
|
struct parahotplug_request *req =
|
|
list_entry(pos, struct parahotplug_request, list);
|
|
|
|
if (!time_after_eq(jiffies, req->expiration))
|
|
continue;
|
|
list_del(pos);
|
|
if (req->msg.hdr.flags.response_expected)
|
|
controlvm_respond(
|
|
&req->msg.hdr,
|
|
CONTROLVM_RESP_DEVICE_UDEV_TIMEOUT,
|
|
&req->msg.cmd.device_change_state.state);
|
|
parahotplug_request_destroy(req);
|
|
}
|
|
spin_unlock(¶hotplug_request_list_lock);
|
|
}
|
|
|
|
static void controlvm_periodic_work(struct work_struct *work)
|
|
{
|
|
struct controlvm_message inmsg;
|
|
int count = 0;
|
|
int err;
|
|
|
|
/* Drain the RESPONSE queue make it empty */
|
|
do {
|
|
err = visorchannel_signalremove(chipset_dev->controlvm_channel,
|
|
CONTROLVM_QUEUE_RESPONSE,
|
|
&inmsg);
|
|
} while ((!err) && (++count < CONTROLVM_MESSAGE_MAX));
|
|
if (err != -EAGAIN)
|
|
goto schedule_out;
|
|
if (chipset_dev->controlvm_pending_msg_valid) {
|
|
/*
|
|
* we throttled processing of a prior msg, so try to process
|
|
* it again rather than reading a new one
|
|
*/
|
|
inmsg = chipset_dev->controlvm_pending_msg;
|
|
chipset_dev->controlvm_pending_msg_valid = false;
|
|
err = 0;
|
|
} else {
|
|
err = read_controlvm_event(&inmsg);
|
|
}
|
|
while (!err) {
|
|
chipset_dev->most_recent_message_jiffies = jiffies;
|
|
err = handle_command(inmsg,
|
|
visorchannel_get_physaddr
|
|
(chipset_dev->controlvm_channel));
|
|
if (err == -EAGAIN) {
|
|
chipset_dev->controlvm_pending_msg = inmsg;
|
|
chipset_dev->controlvm_pending_msg_valid = true;
|
|
break;
|
|
}
|
|
|
|
err = read_controlvm_event(&inmsg);
|
|
}
|
|
/* parahotplug_worker */
|
|
parahotplug_process_list();
|
|
|
|
/*
|
|
* The controlvm messages are sent in a bulk. If we start receiving messages, we
|
|
* want the polling to be fast. If we do not receive any message for
|
|
* MIN_IDLE_SECONDS, we can slow down the polling.
|
|
*/
|
|
schedule_out:
|
|
if (time_after(jiffies, chipset_dev->most_recent_message_jiffies +
|
|
(HZ * MIN_IDLE_SECONDS))) {
|
|
/*
|
|
* it's been longer than MIN_IDLE_SECONDS since we processed
|
|
* our last controlvm message; slow down the polling
|
|
*/
|
|
if (chipset_dev->poll_jiffies != POLLJIFFIES_CONTROLVM_SLOW)
|
|
chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_SLOW;
|
|
} else {
|
|
if (chipset_dev->poll_jiffies != POLLJIFFIES_CONTROLVM_FAST)
|
|
chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_FAST;
|
|
}
|
|
schedule_delayed_work(&chipset_dev->periodic_controlvm_work,
|
|
chipset_dev->poll_jiffies);
|
|
}
|
|
|
|
static int visorchipset_init(struct acpi_device *acpi_device)
|
|
{
|
|
int err = -ENODEV;
|
|
struct visorchannel *controlvm_channel;
|
|
|
|
chipset_dev = kzalloc(sizeof(*chipset_dev), GFP_KERNEL);
|
|
if (!chipset_dev)
|
|
goto error;
|
|
err = controlvm_channel_create(chipset_dev);
|
|
if (err)
|
|
goto error_free_chipset_dev;
|
|
acpi_device->driver_data = chipset_dev;
|
|
chipset_dev->acpi_device = acpi_device;
|
|
chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_FAST;
|
|
err = sysfs_create_groups(&chipset_dev->acpi_device->dev.kobj,
|
|
visorchipset_dev_groups);
|
|
if (err < 0)
|
|
goto error_destroy_channel;
|
|
controlvm_channel = chipset_dev->controlvm_channel;
|
|
if (!visor_check_channel(visorchannel_get_header(controlvm_channel),
|
|
&chipset_dev->acpi_device->dev,
|
|
&visor_controlvm_channel_guid,
|
|
"controlvm",
|
|
sizeof(struct visor_controlvm_channel),
|
|
VISOR_CONTROLVM_CHANNEL_VERSIONID,
|
|
VISOR_CHANNEL_SIGNATURE))
|
|
goto error_delete_groups;
|
|
/* if booting in a crash kernel */
|
|
if (is_kdump_kernel())
|
|
INIT_DELAYED_WORK(&chipset_dev->periodic_controlvm_work,
|
|
setup_crash_devices_work_queue);
|
|
else
|
|
INIT_DELAYED_WORK(&chipset_dev->periodic_controlvm_work,
|
|
controlvm_periodic_work);
|
|
chipset_dev->most_recent_message_jiffies = jiffies;
|
|
chipset_dev->poll_jiffies = POLLJIFFIES_CONTROLVM_FAST;
|
|
schedule_delayed_work(&chipset_dev->periodic_controlvm_work,
|
|
chipset_dev->poll_jiffies);
|
|
err = visorbus_init();
|
|
if (err < 0)
|
|
goto error_cancel_work;
|
|
return 0;
|
|
|
|
error_cancel_work:
|
|
cancel_delayed_work_sync(&chipset_dev->periodic_controlvm_work);
|
|
|
|
error_delete_groups:
|
|
sysfs_remove_groups(&chipset_dev->acpi_device->dev.kobj,
|
|
visorchipset_dev_groups);
|
|
|
|
error_destroy_channel:
|
|
visorchannel_destroy(chipset_dev->controlvm_channel);
|
|
|
|
error_free_chipset_dev:
|
|
kfree(chipset_dev);
|
|
|
|
error:
|
|
dev_err(&acpi_device->dev, "failed with error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
static int visorchipset_exit(struct acpi_device *acpi_device)
|
|
{
|
|
visorbus_exit();
|
|
cancel_delayed_work_sync(&chipset_dev->periodic_controlvm_work);
|
|
sysfs_remove_groups(&chipset_dev->acpi_device->dev.kobj,
|
|
visorchipset_dev_groups);
|
|
visorchannel_destroy(chipset_dev->controlvm_channel);
|
|
kfree(chipset_dev);
|
|
return 0;
|
|
}
|
|
|
|
static const struct acpi_device_id unisys_device_ids[] = {
|
|
{"PNP0A07", 0},
|
|
{"", 0},
|
|
};
|
|
|
|
static struct acpi_driver unisys_acpi_driver = {
|
|
.name = "unisys_acpi",
|
|
.class = "unisys_acpi_class",
|
|
.owner = THIS_MODULE,
|
|
.ids = unisys_device_ids,
|
|
.ops = {
|
|
.add = visorchipset_init,
|
|
.remove = visorchipset_exit,
|
|
},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(acpi, unisys_device_ids);
|
|
|
|
static __init int visorutil_spar_detect(void)
|
|
{
|
|
unsigned int eax, ebx, ecx, edx;
|
|
|
|
if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
|
|
/* check the ID */
|
|
cpuid(UNISYS_VISOR_LEAF_ID, &eax, &ebx, &ecx, &edx);
|
|
return (ebx == UNISYS_VISOR_ID_EBX) &&
|
|
(ecx == UNISYS_VISOR_ID_ECX) &&
|
|
(edx == UNISYS_VISOR_ID_EDX);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init init_unisys(void)
|
|
{
|
|
int result;
|
|
|
|
if (!visorutil_spar_detect())
|
|
return -ENODEV;
|
|
result = acpi_bus_register_driver(&unisys_acpi_driver);
|
|
if (result)
|
|
return -ENODEV;
|
|
pr_info("Unisys Visorchipset Driver Loaded.\n");
|
|
return 0;
|
|
};
|
|
|
|
static void __exit exit_unisys(void)
|
|
{
|
|
acpi_bus_unregister_driver(&unisys_acpi_driver);
|
|
}
|
|
|
|
module_init(init_unisys);
|
|
module_exit(exit_unisys);
|
|
|
|
MODULE_AUTHOR("Unisys");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("s-Par visorbus driver for virtual device buses");
|