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66ef47faa9
It was found that unloading 'hid_hyperv' module results in a devres complaint: ... hv_vmbus: unregistering driver hid_hyperv ------------[ cut here ]------------ WARNING: CPU: 2 PID: 3983 at drivers/base/devres.c:691 devres_release_group+0x1f2/0x2c0 ... Call Trace: <TASK> ? devres_release_group+0x1f2/0x2c0 ? __warn+0xd1/0x1c0 ? devres_release_group+0x1f2/0x2c0 ? report_bug+0x32a/0x3c0 ? handle_bug+0x53/0xa0 ? exc_invalid_op+0x18/0x50 ? asm_exc_invalid_op+0x1a/0x20 ? devres_release_group+0x1f2/0x2c0 ? devres_release_group+0x90/0x2c0 ? rcu_is_watching+0x15/0xb0 ? __pfx_devres_release_group+0x10/0x10 hid_device_remove+0xf5/0x220 device_release_driver_internal+0x371/0x540 ? klist_put+0xf3/0x170 bus_remove_device+0x1f1/0x3f0 device_del+0x33f/0x8c0 ? __pfx_device_del+0x10/0x10 ? cleanup_srcu_struct+0x337/0x500 hid_destroy_device+0xc8/0x130 mousevsc_remove+0xd2/0x1d0 [hid_hyperv] device_release_driver_internal+0x371/0x540 driver_detach+0xc5/0x180 bus_remove_driver+0x11e/0x2a0 ? __mutex_unlock_slowpath+0x160/0x5e0 vmbus_driver_unregister+0x62/0x2b0 [hv_vmbus] ... And the issue seems to be that the corresponding devres group is not allocated. Normally, devres_open_group() is called from __hid_device_probe() but Hyper-V HID driver overrides 'hid_dev->driver' with 'mousevsc_hid_driver' stub and basically re-implements __hid_device_probe() by calling hid_parse() and hid_hw_start() but not devres_open_group(). hid_device_probe() does not call __hid_device_probe() for it. Later, when the driver is removed, hid_device_remove() calls devres_release_group() as it doesn't check whether hdev->driver was initially overridden or not. The issue seems to be related to the commit62c68e7cee
("HID: ensure timely release of driver-allocated resources") but the commit itself seems to be correct. Fix the issue by dropping the 'hid_dev->driver' override and using hid_register_driver()/hid_unregister_driver() instead. Alternatively, it would have been possible to rely on the default handling but HID_CONNECT_DEFAULT implies HID_CONNECT_HIDRAW and it doesn't seem to work for mousevsc as-is. Fixes:62c68e7cee
("HID: ensure timely release of driver-allocated resources") Suggested-by: Michael Kelley <mhklinux@outlook.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Michael Kelley <mhklinux@outlook.com> Tested-by: Saurabh Sengar <ssengar@linux.microsoft.com> Signed-off-by: Jiri Kosina <jkosina@suse.com>
619 lines
13 KiB
C
619 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2009, Citrix Systems, Inc.
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* Copyright (c) 2010, Microsoft Corporation.
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* Copyright (c) 2011, Novell Inc.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/completion.h>
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#include <linux/input.h>
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#include <linux/hid.h>
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#include <linux/hiddev.h>
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#include <linux/hyperv.h>
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struct hv_input_dev_info {
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unsigned int size;
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unsigned short vendor;
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unsigned short product;
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unsigned short version;
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unsigned short reserved[11];
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};
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/*
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* Current version
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*
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* History:
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* Beta, RC < 2008/1/22 1,0
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* RC > 2008/1/22 2,0
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*/
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#define SYNTHHID_INPUT_VERSION_MAJOR 2
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#define SYNTHHID_INPUT_VERSION_MINOR 0
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#define SYNTHHID_INPUT_VERSION (SYNTHHID_INPUT_VERSION_MINOR | \
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(SYNTHHID_INPUT_VERSION_MAJOR << 16))
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#pragma pack(push, 1)
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/*
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* Message types in the synthetic input protocol
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*/
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enum synthhid_msg_type {
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SYNTH_HID_PROTOCOL_REQUEST,
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SYNTH_HID_PROTOCOL_RESPONSE,
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SYNTH_HID_INITIAL_DEVICE_INFO,
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SYNTH_HID_INITIAL_DEVICE_INFO_ACK,
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SYNTH_HID_INPUT_REPORT,
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SYNTH_HID_MAX
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};
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/*
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* Basic message structures.
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*/
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struct synthhid_msg_hdr {
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enum synthhid_msg_type type;
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u32 size;
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};
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union synthhid_version {
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struct {
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u16 minor_version;
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u16 major_version;
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};
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u32 version;
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};
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/*
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* Protocol messages
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*/
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struct synthhid_protocol_request {
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struct synthhid_msg_hdr header;
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union synthhid_version version_requested;
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};
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struct synthhid_protocol_response {
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struct synthhid_msg_hdr header;
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union synthhid_version version_requested;
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unsigned char approved;
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};
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struct synthhid_device_info {
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struct synthhid_msg_hdr header;
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struct hv_input_dev_info hid_dev_info;
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struct hid_descriptor hid_descriptor;
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};
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struct synthhid_device_info_ack {
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struct synthhid_msg_hdr header;
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unsigned char reserved;
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};
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struct synthhid_input_report {
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struct synthhid_msg_hdr header;
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char buffer[];
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};
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#pragma pack(pop)
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#define INPUTVSC_SEND_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)
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#define INPUTVSC_RECV_RING_BUFFER_SIZE VMBUS_RING_SIZE(36 * 1024)
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enum pipe_prot_msg_type {
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PIPE_MESSAGE_INVALID,
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PIPE_MESSAGE_DATA,
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PIPE_MESSAGE_MAXIMUM
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};
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struct pipe_prt_msg {
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enum pipe_prot_msg_type type;
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u32 size;
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char data[];
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};
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struct mousevsc_prt_msg {
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enum pipe_prot_msg_type type;
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u32 size;
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union {
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struct synthhid_protocol_request request;
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struct synthhid_protocol_response response;
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struct synthhid_device_info_ack ack;
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};
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};
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/*
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* Represents an mousevsc device
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*/
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struct mousevsc_dev {
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struct hv_device *device;
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bool init_complete;
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bool connected;
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struct mousevsc_prt_msg protocol_req;
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struct mousevsc_prt_msg protocol_resp;
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/* Synchronize the request/response if needed */
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struct completion wait_event;
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int dev_info_status;
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struct hid_descriptor *hid_desc;
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unsigned char *report_desc;
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u32 report_desc_size;
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struct hv_input_dev_info hid_dev_info;
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struct hid_device *hid_device;
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u8 input_buf[HID_MAX_BUFFER_SIZE];
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};
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static struct mousevsc_dev *mousevsc_alloc_device(struct hv_device *device)
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{
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struct mousevsc_dev *input_dev;
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input_dev = kzalloc(sizeof(struct mousevsc_dev), GFP_KERNEL);
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if (!input_dev)
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return NULL;
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input_dev->device = device;
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hv_set_drvdata(device, input_dev);
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init_completion(&input_dev->wait_event);
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input_dev->init_complete = false;
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return input_dev;
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}
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static void mousevsc_free_device(struct mousevsc_dev *device)
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{
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kfree(device->hid_desc);
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kfree(device->report_desc);
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hv_set_drvdata(device->device, NULL);
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kfree(device);
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}
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static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
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struct synthhid_device_info *device_info)
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{
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int ret = 0;
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struct hid_descriptor *desc;
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struct mousevsc_prt_msg ack;
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input_device->dev_info_status = -ENOMEM;
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input_device->hid_dev_info = device_info->hid_dev_info;
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desc = &device_info->hid_descriptor;
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if (desc->bLength == 0)
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goto cleanup;
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/* The pointer is not NULL when we resume from hibernation */
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kfree(input_device->hid_desc);
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input_device->hid_desc = kmemdup(desc, desc->bLength, GFP_ATOMIC);
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if (!input_device->hid_desc)
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goto cleanup;
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input_device->report_desc_size = le16_to_cpu(
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desc->desc[0].wDescriptorLength);
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if (input_device->report_desc_size == 0) {
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input_device->dev_info_status = -EINVAL;
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goto cleanup;
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}
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/* The pointer is not NULL when we resume from hibernation */
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kfree(input_device->report_desc);
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input_device->report_desc = kzalloc(input_device->report_desc_size,
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GFP_ATOMIC);
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if (!input_device->report_desc) {
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input_device->dev_info_status = -ENOMEM;
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goto cleanup;
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}
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memcpy(input_device->report_desc,
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((unsigned char *)desc) + desc->bLength,
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le16_to_cpu(desc->desc[0].wDescriptorLength));
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/* Send the ack */
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memset(&ack, 0, sizeof(struct mousevsc_prt_msg));
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ack.type = PIPE_MESSAGE_DATA;
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ack.size = sizeof(struct synthhid_device_info_ack);
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ack.ack.header.type = SYNTH_HID_INITIAL_DEVICE_INFO_ACK;
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ack.ack.header.size = 1;
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ack.ack.reserved = 0;
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ret = vmbus_sendpacket(input_device->device->channel,
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&ack,
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sizeof(struct pipe_prt_msg) +
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sizeof(struct synthhid_device_info_ack),
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(unsigned long)&ack,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (!ret)
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input_device->dev_info_status = 0;
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cleanup:
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complete(&input_device->wait_event);
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return;
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}
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static void mousevsc_on_receive(struct hv_device *device,
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struct vmpacket_descriptor *packet)
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{
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struct pipe_prt_msg *pipe_msg;
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struct synthhid_msg_hdr *hid_msg_hdr;
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struct mousevsc_dev *input_dev = hv_get_drvdata(device);
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struct synthhid_input_report *input_report;
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size_t len;
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pipe_msg = (struct pipe_prt_msg *)((unsigned long)packet +
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(packet->offset8 << 3));
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if (pipe_msg->type != PIPE_MESSAGE_DATA)
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return;
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hid_msg_hdr = (struct synthhid_msg_hdr *)pipe_msg->data;
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switch (hid_msg_hdr->type) {
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case SYNTH_HID_PROTOCOL_RESPONSE:
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len = struct_size(pipe_msg, data, pipe_msg->size);
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/*
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* While it will be impossible for us to protect against
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* malicious/buggy hypervisor/host, add a check here to
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* ensure we don't corrupt memory.
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*/
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if (WARN_ON(len > sizeof(struct mousevsc_prt_msg)))
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break;
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memcpy(&input_dev->protocol_resp, pipe_msg, len);
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complete(&input_dev->wait_event);
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break;
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case SYNTH_HID_INITIAL_DEVICE_INFO:
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WARN_ON(pipe_msg->size < sizeof(struct hv_input_dev_info));
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/*
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* Parse out the device info into device attr,
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* hid desc and report desc
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*/
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mousevsc_on_receive_device_info(input_dev,
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(struct synthhid_device_info *)pipe_msg->data);
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break;
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case SYNTH_HID_INPUT_REPORT:
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input_report =
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(struct synthhid_input_report *)pipe_msg->data;
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if (!input_dev->init_complete)
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break;
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len = min(input_report->header.size,
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(u32)sizeof(input_dev->input_buf));
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memcpy(input_dev->input_buf, input_report->buffer, len);
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hid_input_report(input_dev->hid_device, HID_INPUT_REPORT,
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input_dev->input_buf, len, 1);
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pm_wakeup_hard_event(&input_dev->device->device);
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break;
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default:
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pr_err("unsupported hid msg type - type %d len %d\n",
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hid_msg_hdr->type, hid_msg_hdr->size);
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break;
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}
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}
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static void mousevsc_on_channel_callback(void *context)
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{
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struct hv_device *device = context;
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struct vmpacket_descriptor *desc;
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foreach_vmbus_pkt(desc, device->channel) {
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switch (desc->type) {
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case VM_PKT_COMP:
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break;
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case VM_PKT_DATA_INBAND:
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mousevsc_on_receive(device, desc);
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break;
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default:
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pr_err("Unhandled packet type %d, tid %llx len %d\n",
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desc->type, desc->trans_id, desc->len8 * 8);
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break;
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}
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}
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}
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static int mousevsc_connect_to_vsp(struct hv_device *device)
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{
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int ret = 0;
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unsigned long t;
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struct mousevsc_dev *input_dev = hv_get_drvdata(device);
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struct mousevsc_prt_msg *request;
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struct mousevsc_prt_msg *response;
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reinit_completion(&input_dev->wait_event);
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request = &input_dev->protocol_req;
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memset(request, 0, sizeof(struct mousevsc_prt_msg));
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request->type = PIPE_MESSAGE_DATA;
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request->size = sizeof(struct synthhid_protocol_request);
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request->request.header.type = SYNTH_HID_PROTOCOL_REQUEST;
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request->request.header.size = sizeof(unsigned int);
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request->request.version_requested.version = SYNTHHID_INPUT_VERSION;
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ret = vmbus_sendpacket(device->channel, request,
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sizeof(struct pipe_prt_msg) +
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sizeof(struct synthhid_protocol_request),
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(unsigned long)request,
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VM_PKT_DATA_INBAND,
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VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
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if (ret)
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goto cleanup;
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t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
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if (!t) {
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ret = -ETIMEDOUT;
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goto cleanup;
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}
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response = &input_dev->protocol_resp;
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if (!response->response.approved) {
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pr_err("synthhid protocol request failed (version %d)\n",
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SYNTHHID_INPUT_VERSION);
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ret = -ENODEV;
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goto cleanup;
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}
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t = wait_for_completion_timeout(&input_dev->wait_event, 5*HZ);
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if (!t) {
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ret = -ETIMEDOUT;
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goto cleanup;
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}
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/*
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* We should have gotten the device attr, hid desc and report
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* desc at this point
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*/
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ret = input_dev->dev_info_status;
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cleanup:
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return ret;
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}
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static int mousevsc_hid_parse(struct hid_device *hid)
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{
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struct hv_device *dev = hid_get_drvdata(hid);
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struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
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return hid_parse_report(hid, input_dev->report_desc,
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input_dev->report_desc_size);
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}
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static int mousevsc_hid_open(struct hid_device *hid)
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{
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return 0;
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}
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static int mousevsc_hid_start(struct hid_device *hid)
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{
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return 0;
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}
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static void mousevsc_hid_close(struct hid_device *hid)
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{
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}
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static void mousevsc_hid_stop(struct hid_device *hid)
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{
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}
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static int mousevsc_hid_raw_request(struct hid_device *hid,
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unsigned char report_num,
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__u8 *buf, size_t len,
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unsigned char rtype,
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int reqtype)
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{
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return 0;
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}
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static int mousevsc_hid_probe(struct hid_device *hid_dev, const struct hid_device_id *id)
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{
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int ret;
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ret = hid_parse(hid_dev);
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if (ret) {
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hid_err(hid_dev, "parse failed\n");
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return ret;
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}
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ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT | HID_CONNECT_HIDDEV);
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if (ret) {
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hid_err(hid_dev, "hw start failed\n");
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return ret;
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}
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return 0;
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}
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static const struct hid_ll_driver mousevsc_ll_driver = {
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.parse = mousevsc_hid_parse,
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.open = mousevsc_hid_open,
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.close = mousevsc_hid_close,
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.start = mousevsc_hid_start,
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.stop = mousevsc_hid_stop,
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.raw_request = mousevsc_hid_raw_request,
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};
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|
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static const struct hid_device_id mousevsc_devices[] = {
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{ HID_DEVICE(BUS_VIRTUAL, HID_GROUP_ANY, 0x045E, 0x0621) },
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{ }
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};
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static struct hid_driver mousevsc_hid_driver = {
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.name = "hid-hyperv",
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.id_table = mousevsc_devices,
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.probe = mousevsc_hid_probe,
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};
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|
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static int mousevsc_probe(struct hv_device *device,
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const struct hv_vmbus_device_id *dev_id)
|
|
{
|
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int ret;
|
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struct mousevsc_dev *input_dev;
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struct hid_device *hid_dev;
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|
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input_dev = mousevsc_alloc_device(device);
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|
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if (!input_dev)
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return -ENOMEM;
|
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|
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ret = vmbus_open(device->channel,
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INPUTVSC_SEND_RING_BUFFER_SIZE,
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INPUTVSC_RECV_RING_BUFFER_SIZE,
|
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NULL,
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0,
|
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mousevsc_on_channel_callback,
|
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device
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|
);
|
|
|
|
if (ret)
|
|
goto probe_err0;
|
|
|
|
ret = mousevsc_connect_to_vsp(device);
|
|
|
|
if (ret)
|
|
goto probe_err1;
|
|
|
|
/* workaround SA-167 */
|
|
if (input_dev->report_desc[14] == 0x25)
|
|
input_dev->report_desc[14] = 0x29;
|
|
|
|
hid_dev = hid_allocate_device();
|
|
if (IS_ERR(hid_dev)) {
|
|
ret = PTR_ERR(hid_dev);
|
|
goto probe_err1;
|
|
}
|
|
|
|
hid_dev->ll_driver = &mousevsc_ll_driver;
|
|
hid_dev->bus = BUS_VIRTUAL;
|
|
hid_dev->vendor = input_dev->hid_dev_info.vendor;
|
|
hid_dev->product = input_dev->hid_dev_info.product;
|
|
hid_dev->version = input_dev->hid_dev_info.version;
|
|
input_dev->hid_device = hid_dev;
|
|
|
|
sprintf(hid_dev->name, "%s", "Microsoft Vmbus HID-compliant Mouse");
|
|
|
|
hid_set_drvdata(hid_dev, device);
|
|
|
|
ret = hid_add_device(hid_dev);
|
|
if (ret)
|
|
goto probe_err2;
|
|
|
|
device_init_wakeup(&device->device, true);
|
|
|
|
input_dev->connected = true;
|
|
input_dev->init_complete = true;
|
|
|
|
return ret;
|
|
|
|
probe_err2:
|
|
hid_destroy_device(hid_dev);
|
|
|
|
probe_err1:
|
|
vmbus_close(device->channel);
|
|
|
|
probe_err0:
|
|
mousevsc_free_device(input_dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static void mousevsc_remove(struct hv_device *dev)
|
|
{
|
|
struct mousevsc_dev *input_dev = hv_get_drvdata(dev);
|
|
|
|
device_init_wakeup(&dev->device, false);
|
|
vmbus_close(dev->channel);
|
|
hid_hw_stop(input_dev->hid_device);
|
|
hid_destroy_device(input_dev->hid_device);
|
|
mousevsc_free_device(input_dev);
|
|
}
|
|
|
|
static int mousevsc_suspend(struct hv_device *dev)
|
|
{
|
|
vmbus_close(dev->channel);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mousevsc_resume(struct hv_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = vmbus_open(dev->channel,
|
|
INPUTVSC_SEND_RING_BUFFER_SIZE,
|
|
INPUTVSC_RECV_RING_BUFFER_SIZE,
|
|
NULL, 0,
|
|
mousevsc_on_channel_callback,
|
|
dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = mousevsc_connect_to_vsp(dev);
|
|
return ret;
|
|
}
|
|
|
|
static const struct hv_vmbus_device_id id_table[] = {
|
|
/* Mouse guid */
|
|
{ HV_MOUSE_GUID, },
|
|
{ },
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(vmbus, id_table);
|
|
|
|
static struct hv_driver mousevsc_drv = {
|
|
.name = KBUILD_MODNAME,
|
|
.id_table = id_table,
|
|
.probe = mousevsc_probe,
|
|
.remove = mousevsc_remove,
|
|
.suspend = mousevsc_suspend,
|
|
.resume = mousevsc_resume,
|
|
.driver = {
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
},
|
|
};
|
|
|
|
static int __init mousevsc_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = hid_register_driver(&mousevsc_hid_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = vmbus_driver_register(&mousevsc_drv);
|
|
if (ret)
|
|
hid_unregister_driver(&mousevsc_hid_driver);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit mousevsc_exit(void)
|
|
{
|
|
vmbus_driver_unregister(&mousevsc_drv);
|
|
hid_unregister_driver(&mousevsc_hid_driver);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic HID Driver");
|
|
|
|
module_init(mousevsc_init);
|
|
module_exit(mousevsc_exit);
|