From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- drivers/hv/hv_trace.h | 361 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 361 insertions(+) create mode 100644 drivers/hv/hv_trace.h (limited to 'drivers/hv/hv_trace.h') diff --git a/drivers/hv/hv_trace.h b/drivers/hv/hv_trace.h new file mode 100644 index 000000000..c02a1719e --- /dev/null +++ b/drivers/hv/hv_trace.h @@ -0,0 +1,361 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM hyperv + +#if !defined(_HV_TRACE_H) || defined(TRACE_HEADER_MULTI_READ) +#define _HV_TRACE_H + +#include + +DECLARE_EVENT_CLASS(vmbus_hdr_msg, + TP_PROTO(const struct vmbus_channel_message_header *hdr), + TP_ARGS(hdr), + TP_STRUCT__entry(__field(unsigned int, msgtype)), + TP_fast_assign(__entry->msgtype = hdr->msgtype;), + TP_printk("msgtype=%u", __entry->msgtype) +); + +DEFINE_EVENT(vmbus_hdr_msg, vmbus_on_msg_dpc, + TP_PROTO(const struct vmbus_channel_message_header *hdr), + TP_ARGS(hdr) +); + +DEFINE_EVENT(vmbus_hdr_msg, vmbus_on_message, + TP_PROTO(const struct vmbus_channel_message_header *hdr), + TP_ARGS(hdr) +); + +TRACE_EVENT(vmbus_onoffer, + TP_PROTO(const struct vmbus_channel_offer_channel *offer), + TP_ARGS(offer), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u8, monitorid) + __field(u16, is_ddc_int) + __field(u32, connection_id) + __array(char, if_type, 16) + __array(char, if_instance, 16) + __field(u16, chn_flags) + __field(u16, mmio_mb) + __field(u16, sub_idx) + ), + TP_fast_assign(__entry->child_relid = offer->child_relid; + __entry->monitorid = offer->monitorid; + __entry->is_ddc_int = offer->is_dedicated_interrupt; + __entry->connection_id = offer->connection_id; + export_guid(__entry->if_type, &offer->offer.if_type); + export_guid(__entry->if_instance, &offer->offer.if_instance); + __entry->chn_flags = offer->offer.chn_flags; + __entry->mmio_mb = offer->offer.mmio_megabytes; + __entry->sub_idx = offer->offer.sub_channel_index; + ), + TP_printk("child_relid 0x%x, monitorid 0x%x, is_dedicated %d, " + "connection_id 0x%x, if_type %pUl, if_instance %pUl, " + "chn_flags 0x%x, mmio_megabytes %d, sub_channel_index %d", + __entry->child_relid, __entry->monitorid, + __entry->is_ddc_int, __entry->connection_id, + __entry->if_type, __entry->if_instance, + __entry->chn_flags, __entry->mmio_mb, + __entry->sub_idx + ) + ); + +TRACE_EVENT(vmbus_onoffer_rescind, + TP_PROTO(const struct vmbus_channel_rescind_offer *offer), + TP_ARGS(offer), + TP_STRUCT__entry(__field(u32, child_relid)), + TP_fast_assign(__entry->child_relid = offer->child_relid), + TP_printk("child_relid 0x%x", __entry->child_relid) + ); + +TRACE_EVENT(vmbus_onopen_result, + TP_PROTO(const struct vmbus_channel_open_result *result), + TP_ARGS(result), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u32, openid) + __field(u32, status) + ), + TP_fast_assign(__entry->child_relid = result->child_relid; + __entry->openid = result->openid; + __entry->status = result->status; + ), + TP_printk("child_relid 0x%x, openid %d, status %d", + __entry->child_relid, __entry->openid, __entry->status + ) + ); + +TRACE_EVENT(vmbus_ongpadl_created, + TP_PROTO(const struct vmbus_channel_gpadl_created *gpadlcreated), + TP_ARGS(gpadlcreated), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u32, gpadl) + __field(u32, status) + ), + TP_fast_assign(__entry->child_relid = gpadlcreated->child_relid; + __entry->gpadl = gpadlcreated->gpadl; + __entry->status = gpadlcreated->creation_status; + ), + TP_printk("child_relid 0x%x, gpadl 0x%x, creation_status %d", + __entry->child_relid, __entry->gpadl, __entry->status + ) + ); + +TRACE_EVENT(vmbus_onmodifychannel_response, + TP_PROTO(const struct vmbus_channel_modifychannel_response *response), + TP_ARGS(response), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u32, status) + ), + TP_fast_assign(__entry->child_relid = response->child_relid; + __entry->status = response->status; + ), + TP_printk("child_relid 0x%x, status %d", + __entry->child_relid, __entry->status + ) + ); + +TRACE_EVENT(vmbus_ongpadl_torndown, + TP_PROTO(const struct vmbus_channel_gpadl_torndown *gpadltorndown), + TP_ARGS(gpadltorndown), + TP_STRUCT__entry(__field(u32, gpadl)), + TP_fast_assign(__entry->gpadl = gpadltorndown->gpadl), + TP_printk("gpadl 0x%x", __entry->gpadl) + ); + +TRACE_EVENT(vmbus_onversion_response, + TP_PROTO(const struct vmbus_channel_version_response *response), + TP_ARGS(response), + TP_STRUCT__entry( + __field(u8, ver) + ), + TP_fast_assign(__entry->ver = response->version_supported; + ), + TP_printk("version_supported %d", __entry->ver) + ); + +TRACE_EVENT(vmbus_request_offers, + TP_PROTO(int ret), + TP_ARGS(ret), + TP_STRUCT__entry(__field(int, ret)), + TP_fast_assign(__entry->ret = ret), + TP_printk("sending ret %d", __entry->ret) + ); + +TRACE_EVENT(vmbus_open, + TP_PROTO(const struct vmbus_channel_open_channel *msg, int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u32, openid) + __field(u32, gpadlhandle) + __field(u32, target_vp) + __field(u32, offset) + __field(int, ret) + ), + TP_fast_assign( + __entry->child_relid = msg->child_relid; + __entry->openid = msg->openid; + __entry->gpadlhandle = msg->ringbuffer_gpadlhandle; + __entry->target_vp = msg->target_vp; + __entry->offset = msg->downstream_ringbuffer_pageoffset; + __entry->ret = ret; + ), + TP_printk("sending child_relid 0x%x, openid %d, " + "gpadlhandle 0x%x, target_vp 0x%x, offset 0x%x, ret %d", + __entry->child_relid, __entry->openid, + __entry->gpadlhandle, __entry->target_vp, + __entry->offset, __entry->ret + ) + ); + +TRACE_EVENT(vmbus_close_internal, + TP_PROTO(const struct vmbus_channel_close_channel *msg, int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(int, ret) + ), + TP_fast_assign( + __entry->child_relid = msg->child_relid; + __entry->ret = ret; + ), + TP_printk("sending child_relid 0x%x, ret %d", __entry->child_relid, + __entry->ret) + ); + +TRACE_EVENT(vmbus_establish_gpadl_header, + TP_PROTO(const struct vmbus_channel_gpadl_header *msg, int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u32, gpadl) + __field(u16, range_buflen) + __field(u16, rangecount) + __field(int, ret) + ), + TP_fast_assign( + __entry->child_relid = msg->child_relid; + __entry->gpadl = msg->gpadl; + __entry->range_buflen = msg->range_buflen; + __entry->rangecount = msg->rangecount; + __entry->ret = ret; + ), + TP_printk("sending child_relid 0x%x, gpadl 0x%x, range_buflen %d " + "rangecount %d, ret %d", + __entry->child_relid, __entry->gpadl, + __entry->range_buflen, __entry->rangecount, __entry->ret + ) + ); + +TRACE_EVENT(vmbus_establish_gpadl_body, + TP_PROTO(const struct vmbus_channel_gpadl_body *msg, int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, msgnumber) + __field(u32, gpadl) + __field(int, ret) + ), + TP_fast_assign( + __entry->msgnumber = msg->msgnumber; + __entry->gpadl = msg->gpadl; + __entry->ret = ret; + ), + TP_printk("sending msgnumber %d, gpadl 0x%x, ret %d", + __entry->msgnumber, __entry->gpadl, __entry->ret + ) + ); + +TRACE_EVENT(vmbus_teardown_gpadl, + TP_PROTO(const struct vmbus_channel_gpadl_teardown *msg, int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u32, gpadl) + __field(int, ret) + ), + TP_fast_assign( + __entry->child_relid = msg->child_relid; + __entry->gpadl = msg->gpadl; + __entry->ret = ret; + ), + TP_printk("sending child_relid 0x%x, gpadl 0x%x, ret %d", + __entry->child_relid, __entry->gpadl, __entry->ret + ) + ); + +TRACE_EVENT(vmbus_negotiate_version, + TP_PROTO(const struct vmbus_channel_initiate_contact *msg, int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, ver) + __field(u32, target_vcpu) + __field(int, ret) + __field(u64, int_page) + __field(u64, mon_page1) + __field(u64, mon_page2) + ), + TP_fast_assign( + __entry->ver = msg->vmbus_version_requested; + __entry->target_vcpu = msg->target_vcpu; + __entry->int_page = msg->interrupt_page; + __entry->mon_page1 = msg->monitor_page1; + __entry->mon_page2 = msg->monitor_page2; + __entry->ret = ret; + ), + TP_printk("sending vmbus_version_requested %d, target_vcpu 0x%x, " + "pages %llx:%llx:%llx, ret %d", + __entry->ver, __entry->target_vcpu, __entry->int_page, + __entry->mon_page1, __entry->mon_page2, __entry->ret + ) + ); + +TRACE_EVENT(vmbus_release_relid, + TP_PROTO(const struct vmbus_channel_relid_released *msg, int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(int, ret) + ), + TP_fast_assign( + __entry->child_relid = msg->child_relid; + __entry->ret = ret; + ), + TP_printk("sending child_relid 0x%x, ret %d", + __entry->child_relid, __entry->ret + ) + ); + +TRACE_EVENT(vmbus_send_tl_connect_request, + TP_PROTO(const struct vmbus_channel_tl_connect_request *msg, + int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __array(char, guest_id, 16) + __array(char, host_id, 16) + __field(int, ret) + ), + TP_fast_assign( + export_guid(__entry->guest_id, &msg->guest_endpoint_id); + export_guid(__entry->host_id, &msg->host_service_id); + __entry->ret = ret; + ), + TP_printk("sending guest_endpoint_id %pUl, host_service_id %pUl, " + "ret %d", + __entry->guest_id, __entry->host_id, __entry->ret + ) + ); + +TRACE_EVENT(vmbus_send_modifychannel, + TP_PROTO(const struct vmbus_channel_modifychannel *msg, + int ret), + TP_ARGS(msg, ret), + TP_STRUCT__entry( + __field(u32, child_relid) + __field(u32, target_vp) + __field(int, ret) + ), + TP_fast_assign( + __entry->child_relid = msg->child_relid; + __entry->target_vp = msg->target_vp; + __entry->ret = ret; + ), + TP_printk("binding child_relid 0x%x to target_vp 0x%x, ret %d", + __entry->child_relid, __entry->target_vp, __entry->ret + ) + ); + +DECLARE_EVENT_CLASS(vmbus_channel, + TP_PROTO(const struct vmbus_channel *channel), + TP_ARGS(channel), + TP_STRUCT__entry(__field(u32, relid)), + TP_fast_assign(__entry->relid = channel->offermsg.child_relid), + TP_printk("relid 0x%x", __entry->relid) +); + +DEFINE_EVENT(vmbus_channel, vmbus_chan_sched, + TP_PROTO(const struct vmbus_channel *channel), + TP_ARGS(channel) +); + +DEFINE_EVENT(vmbus_channel, vmbus_setevent, + TP_PROTO(const struct vmbus_channel *channel), + TP_ARGS(channel) +); + +DEFINE_EVENT(vmbus_channel, vmbus_on_event, + TP_PROTO(const struct vmbus_channel *channel), + TP_ARGS(channel) +); + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE hv_trace +#endif /* _HV_TRACE_H */ + +/* This part must be outside protection */ +#include -- cgit v1.3.1