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linux/drivers/usb/host/xhci-trace.h
Mathias Nyman 2710f8186f xhci: Stop unnecessary tracking of free trbs in a ring 
Trying to keep track of free trbs in a ring by adding and subtracting
deltas each time a enqueue or dequeue is increased or moved has proven to
be buggy and complicated, especially over long periods of time.

Recently a bug in counting free trbs was fixed, now taking into account
cancelled URBs that were turned into no-ops, preventing free_trbs to
slowly wander off causing unnecessary ring expansion. See
commit fe82f16aafda ("xhci: Fix incorrect tracking of free space on
transfer rings")

Turns out its a lot easier to just calculate the numer of free TRB
based on ring size and the current enqueue and dequeue pointer values.
This is currently only needed for the command ring as multi segment
transfer rings already ensures there is enough room the ring during
the ring expansion check.

We could get rid of the ring->num_trbs_free entry completely, but as
the xhci DbC code also uses it we don't clean that up in this patch.

Reported-by: Miller Hunter <MillerH@hearthnhome.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217242
Tested-by: Miller Hunter <MillerH@hearthnhome.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Message-ID: <20230602144009.1225632-8-mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-06-13 11:34:50 +02:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* xHCI host controller driver
*
* Copyright (C) 2013 Xenia Ragiadakou
*
* Author: Xenia Ragiadakou
* Email : burzalodowa@gmail.com
*/
#undef TRACE_SYSTEM
#define TRACE_SYSTEM xhci-hcd
/*
* The TRACE_SYSTEM_VAR defaults to TRACE_SYSTEM, but must be a
* legitimate C variable. It is not exported to user space.
*/
#undef TRACE_SYSTEM_VAR
#define TRACE_SYSTEM_VAR xhci_hcd
#if !defined(__XHCI_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
#define __XHCI_TRACE_H
#include <linux/tracepoint.h>
#include "xhci.h"
#include "xhci-dbgcap.h"
DECLARE_EVENT_CLASS(xhci_log_msg,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf),
TP_STRUCT__entry(__vstring(msg, vaf->fmt, vaf->va)),
TP_fast_assign(
__assign_vstr(msg, vaf->fmt, vaf->va);
),
TP_printk("%s", __get_str(msg))
);
DEFINE_EVENT(xhci_log_msg, xhci_dbg_address,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(xhci_log_msg, xhci_dbg_context_change,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(xhci_log_msg, xhci_dbg_quirks,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(xhci_log_msg, xhci_dbg_reset_ep,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(xhci_log_msg, xhci_dbg_cancel_urb,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(xhci_log_msg, xhci_dbg_init,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DEFINE_EVENT(xhci_log_msg, xhci_dbg_ring_expansion,
TP_PROTO(struct va_format *vaf),
TP_ARGS(vaf)
);
DECLARE_EVENT_CLASS(xhci_log_ctx,
TP_PROTO(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx,
unsigned int ep_num),
TP_ARGS(xhci, ctx, ep_num),
TP_STRUCT__entry(
__field(int, ctx_64)
__field(unsigned, ctx_type)
__field(dma_addr_t, ctx_dma)
__field(u8 *, ctx_va)
__field(unsigned, ctx_ep_num)
__dynamic_array(u32, ctx_data,
((HCC_64BYTE_CONTEXT(xhci->hcc_params) + 1) * 8) *
((ctx->type == XHCI_CTX_TYPE_INPUT) + ep_num + 1))
),
TP_fast_assign(
__entry->ctx_64 = HCC_64BYTE_CONTEXT(xhci->hcc_params);
__entry->ctx_type = ctx->type;
__entry->ctx_dma = ctx->dma;
__entry->ctx_va = ctx->bytes;
__entry->ctx_ep_num = ep_num;
memcpy(__get_dynamic_array(ctx_data), ctx->bytes,
((HCC_64BYTE_CONTEXT(xhci->hcc_params) + 1) * 32) *
((ctx->type == XHCI_CTX_TYPE_INPUT) + ep_num + 1));
),
TP_printk("ctx_64=%d, ctx_type=%u, ctx_dma=@%llx, ctx_va=@%p",
__entry->ctx_64, __entry->ctx_type,
(unsigned long long) __entry->ctx_dma, __entry->ctx_va
)
);
DEFINE_EVENT(xhci_log_ctx, xhci_address_ctx,
TP_PROTO(struct xhci_hcd *xhci, struct xhci_container_ctx *ctx,
unsigned int ep_num),
TP_ARGS(xhci, ctx, ep_num)
);
DECLARE_EVENT_CLASS(xhci_log_trb,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb),
TP_STRUCT__entry(
__field(u32, type)
__field(u32, field0)
__field(u32, field1)
__field(u32, field2)
__field(u32, field3)
),
TP_fast_assign(
__entry->type = ring->type;
__entry->field0 = le32_to_cpu(trb->field[0]);
__entry->field1 = le32_to_cpu(trb->field[1]);
__entry->field2 = le32_to_cpu(trb->field[2]);
__entry->field3 = le32_to_cpu(trb->field[3]);
),
TP_printk("%s: %s", xhci_ring_type_string(__entry->type),
xhci_decode_trb(__get_buf(XHCI_MSG_MAX), XHCI_MSG_MAX, __entry->field0,
__entry->field1, __entry->field2, __entry->field3)
)
);
DEFINE_EVENT(xhci_log_trb, xhci_handle_event,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb)
);
DEFINE_EVENT(xhci_log_trb, xhci_handle_command,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb)
);
DEFINE_EVENT(xhci_log_trb, xhci_handle_transfer,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb)
);
DEFINE_EVENT(xhci_log_trb, xhci_queue_trb,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb)
);
DEFINE_EVENT(xhci_log_trb, xhci_dbc_handle_event,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb)
);
DEFINE_EVENT(xhci_log_trb, xhci_dbc_handle_transfer,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb)
);
DEFINE_EVENT(xhci_log_trb, xhci_dbc_gadget_ep_queue,
TP_PROTO(struct xhci_ring *ring, struct xhci_generic_trb *trb),
TP_ARGS(ring, trb)
);
DECLARE_EVENT_CLASS(xhci_log_free_virt_dev,
TP_PROTO(struct xhci_virt_device *vdev),
TP_ARGS(vdev),
TP_STRUCT__entry(
__field(void *, vdev)
__field(unsigned long long, out_ctx)
__field(unsigned long long, in_ctx)
__field(u8, fake_port)
__field(u8, real_port)
__field(u16, current_mel)
),
TP_fast_assign(
__entry->vdev = vdev;
__entry->in_ctx = (unsigned long long) vdev->in_ctx->dma;
__entry->out_ctx = (unsigned long long) vdev->out_ctx->dma;
__entry->fake_port = (u8) vdev->fake_port;
__entry->real_port = (u8) vdev->real_port;
__entry->current_mel = (u16) vdev->current_mel;
),
TP_printk("vdev %p ctx %llx | %llx fake_port %d real_port %d current_mel %d",
__entry->vdev, __entry->in_ctx, __entry->out_ctx,
__entry->fake_port, __entry->real_port, __entry->current_mel
)
);
DEFINE_EVENT(xhci_log_free_virt_dev, xhci_free_virt_device,
TP_PROTO(struct xhci_virt_device *vdev),
TP_ARGS(vdev)
);
DECLARE_EVENT_CLASS(xhci_log_virt_dev,
TP_PROTO(struct xhci_virt_device *vdev),
TP_ARGS(vdev),
TP_STRUCT__entry(
__field(void *, vdev)
__field(unsigned long long, out_ctx)
__field(unsigned long long, in_ctx)
__field(int, devnum)
__field(int, state)
__field(int, speed)
__field(u8, portnum)
__field(u8, level)
__field(int, slot_id)
),
TP_fast_assign(
__entry->vdev = vdev;
__entry->in_ctx = (unsigned long long) vdev->in_ctx->dma;
__entry->out_ctx = (unsigned long long) vdev->out_ctx->dma;
__entry->devnum = vdev->udev->devnum;
__entry->state = vdev->udev->state;
__entry->speed = vdev->udev->speed;
__entry->portnum = vdev->udev->portnum;
__entry->level = vdev->udev->level;
__entry->slot_id = vdev->udev->slot_id;
),
TP_printk("vdev %p ctx %llx | %llx num %d state %d speed %d port %d level %d slot %d",
__entry->vdev, __entry->in_ctx, __entry->out_ctx,
__entry->devnum, __entry->state, __entry->speed,
__entry->portnum, __entry->level, __entry->slot_id
)
);
DEFINE_EVENT(xhci_log_virt_dev, xhci_alloc_virt_device,
TP_PROTO(struct xhci_virt_device *vdev),
TP_ARGS(vdev)
);
DEFINE_EVENT(xhci_log_virt_dev, xhci_setup_device,
TP_PROTO(struct xhci_virt_device *vdev),
TP_ARGS(vdev)
);
DEFINE_EVENT(xhci_log_virt_dev, xhci_setup_addressable_virt_device,
TP_PROTO(struct xhci_virt_device *vdev),
TP_ARGS(vdev)
);
DEFINE_EVENT(xhci_log_virt_dev, xhci_stop_device,
TP_PROTO(struct xhci_virt_device *vdev),
TP_ARGS(vdev)
);
DECLARE_EVENT_CLASS(xhci_log_urb,
TP_PROTO(struct urb *urb),
TP_ARGS(urb),
TP_STRUCT__entry(
__field(void *, urb)
__field(unsigned int, pipe)
__field(unsigned int, stream)
__field(int, status)
__field(unsigned int, flags)
__field(int, num_mapped_sgs)
__field(int, num_sgs)
__field(int, length)
__field(int, actual)
__field(int, epnum)
__field(int, dir_in)
__field(int, type)
__field(int, slot_id)
),
TP_fast_assign(
__entry->urb = urb;
__entry->pipe = urb->pipe;
__entry->stream = urb->stream_id;
__entry->status = urb->status;
__entry->flags = urb->transfer_flags;
__entry->num_mapped_sgs = urb->num_mapped_sgs;
__entry->num_sgs = urb->num_sgs;
__entry->length = urb->transfer_buffer_length;
__entry->actual = urb->actual_length;
__entry->epnum = usb_endpoint_num(&urb->ep->desc);
__entry->dir_in = usb_endpoint_dir_in(&urb->ep->desc);
__entry->type = usb_endpoint_type(&urb->ep->desc);
__entry->slot_id = urb->dev->slot_id;
),
TP_printk("ep%d%s-%s: urb %p pipe %u slot %d length %d/%d sgs %d/%d stream %d flags %08x",
__entry->epnum, __entry->dir_in ? "in" : "out",
__print_symbolic(__entry->type,
{ USB_ENDPOINT_XFER_INT, "intr" },
{ USB_ENDPOINT_XFER_CONTROL, "control" },
{ USB_ENDPOINT_XFER_BULK, "bulk" },
{ USB_ENDPOINT_XFER_ISOC, "isoc" }),
__entry->urb, __entry->pipe, __entry->slot_id,
__entry->actual, __entry->length, __entry->num_mapped_sgs,
__entry->num_sgs, __entry->stream, __entry->flags
)
);
DEFINE_EVENT(xhci_log_urb, xhci_urb_enqueue,
TP_PROTO(struct urb *urb),
TP_ARGS(urb)
);
DEFINE_EVENT(xhci_log_urb, xhci_urb_giveback,
TP_PROTO(struct urb *urb),
TP_ARGS(urb)
);
DEFINE_EVENT(xhci_log_urb, xhci_urb_dequeue,
TP_PROTO(struct urb *urb),
TP_ARGS(urb)
);
DECLARE_EVENT_CLASS(xhci_log_ep_ctx,
TP_PROTO(struct xhci_ep_ctx *ctx),
TP_ARGS(ctx),
TP_STRUCT__entry(
__field(u32, info)
__field(u32, info2)
__field(u64, deq)
__field(u32, tx_info)
),
TP_fast_assign(
__entry->info = le32_to_cpu(ctx->ep_info);
__entry->info2 = le32_to_cpu(ctx->ep_info2);
__entry->deq = le64_to_cpu(ctx->deq);
__entry->tx_info = le32_to_cpu(ctx->tx_info);
),
TP_printk("%s", xhci_decode_ep_context(__get_buf(XHCI_MSG_MAX),
__entry->info, __entry->info2, __entry->deq, __entry->tx_info)
)
);
DEFINE_EVENT(xhci_log_ep_ctx, xhci_handle_cmd_stop_ep,
TP_PROTO(struct xhci_ep_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_ep_ctx, xhci_handle_cmd_set_deq_ep,
TP_PROTO(struct xhci_ep_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_ep_ctx, xhci_handle_cmd_reset_ep,
TP_PROTO(struct xhci_ep_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_ep_ctx, xhci_handle_cmd_config_ep,
TP_PROTO(struct xhci_ep_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_ep_ctx, xhci_add_endpoint,
TP_PROTO(struct xhci_ep_ctx *ctx),
TP_ARGS(ctx)
);
DECLARE_EVENT_CLASS(xhci_log_slot_ctx,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx),
TP_STRUCT__entry(
__field(u32, info)
__field(u32, info2)
__field(u32, tt_info)
__field(u32, state)
),
TP_fast_assign(
__entry->info = le32_to_cpu(ctx->dev_info);
__entry->info2 = le32_to_cpu(ctx->dev_info2);
__entry->tt_info = le64_to_cpu(ctx->tt_info);
__entry->state = le32_to_cpu(ctx->dev_state);
),
TP_printk("%s", xhci_decode_slot_context(__get_buf(XHCI_MSG_MAX),
__entry->info, __entry->info2,
__entry->tt_info, __entry->state)
)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_alloc_dev,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_free_dev,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_handle_cmd_disable_slot,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_discover_or_reset_device,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_setup_device_slot,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_handle_cmd_addr_dev,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_handle_cmd_reset_dev,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_handle_cmd_set_deq,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DEFINE_EVENT(xhci_log_slot_ctx, xhci_configure_endpoint,
TP_PROTO(struct xhci_slot_ctx *ctx),
TP_ARGS(ctx)
);
DECLARE_EVENT_CLASS(xhci_log_ctrl_ctx,
TP_PROTO(struct xhci_input_control_ctx *ctrl_ctx),
TP_ARGS(ctrl_ctx),
TP_STRUCT__entry(
__field(u32, drop)
__field(u32, add)
),
TP_fast_assign(
__entry->drop = le32_to_cpu(ctrl_ctx->drop_flags);
__entry->add = le32_to_cpu(ctrl_ctx->add_flags);
),
TP_printk("%s", xhci_decode_ctrl_ctx(__get_buf(XHCI_MSG_MAX), __entry->drop, __entry->add)
)
);
DEFINE_EVENT(xhci_log_ctrl_ctx, xhci_address_ctrl_ctx,
TP_PROTO(struct xhci_input_control_ctx *ctrl_ctx),
TP_ARGS(ctrl_ctx)
);
DEFINE_EVENT(xhci_log_ctrl_ctx, xhci_configure_endpoint_ctrl_ctx,
TP_PROTO(struct xhci_input_control_ctx *ctrl_ctx),
TP_ARGS(ctrl_ctx)
);
DECLARE_EVENT_CLASS(xhci_log_ring,
TP_PROTO(struct xhci_ring *ring),
TP_ARGS(ring),
TP_STRUCT__entry(
__field(u32, type)
__field(void *, ring)
__field(dma_addr_t, enq)
__field(dma_addr_t, deq)
__field(dma_addr_t, enq_seg)
__field(dma_addr_t, deq_seg)
__field(unsigned int, num_segs)
__field(unsigned int, stream_id)
__field(unsigned int, cycle_state)
__field(unsigned int, bounce_buf_len)
),
TP_fast_assign(
__entry->ring = ring;
__entry->type = ring->type;
__entry->num_segs = ring->num_segs;
__entry->stream_id = ring->stream_id;
__entry->enq_seg = ring->enq_seg->dma;
__entry->deq_seg = ring->deq_seg->dma;
__entry->cycle_state = ring->cycle_state;
__entry->bounce_buf_len = ring->bounce_buf_len;
__entry->enq = xhci_trb_virt_to_dma(ring->enq_seg, ring->enqueue);
__entry->deq = xhci_trb_virt_to_dma(ring->deq_seg, ring->dequeue);
),
TP_printk("%s %p: enq %pad(%pad) deq %pad(%pad) segs %d stream %d bounce %d cycle %d",
xhci_ring_type_string(__entry->type), __entry->ring,
&__entry->enq, &__entry->enq_seg,
&__entry->deq, &__entry->deq_seg,
__entry->num_segs,
__entry->stream_id,
__entry->bounce_buf_len,
__entry->cycle_state
)
);
DEFINE_EVENT(xhci_log_ring, xhci_ring_alloc,
TP_PROTO(struct xhci_ring *ring),
TP_ARGS(ring)
);
DEFINE_EVENT(xhci_log_ring, xhci_ring_free,
TP_PROTO(struct xhci_ring *ring),
TP_ARGS(ring)
);
DEFINE_EVENT(xhci_log_ring, xhci_ring_expansion,
TP_PROTO(struct xhci_ring *ring),
TP_ARGS(ring)
);
DEFINE_EVENT(xhci_log_ring, xhci_inc_enq,
TP_PROTO(struct xhci_ring *ring),
TP_ARGS(ring)
);
DEFINE_EVENT(xhci_log_ring, xhci_inc_deq,
TP_PROTO(struct xhci_ring *ring),
TP_ARGS(ring)
);
DECLARE_EVENT_CLASS(xhci_log_portsc,
TP_PROTO(u32 portnum, u32 portsc),
TP_ARGS(portnum, portsc),
TP_STRUCT__entry(
__field(u32, portnum)
__field(u32, portsc)
),
TP_fast_assign(
__entry->portnum = portnum;
__entry->portsc = portsc;
),
TP_printk("port-%d: %s",
__entry->portnum,
xhci_decode_portsc(__get_buf(XHCI_MSG_MAX), __entry->portsc)
)
);
DEFINE_EVENT(xhci_log_portsc, xhci_handle_port_status,
TP_PROTO(u32 portnum, u32 portsc),
TP_ARGS(portnum, portsc)
);
DEFINE_EVENT(xhci_log_portsc, xhci_get_port_status,
TP_PROTO(u32 portnum, u32 portsc),
TP_ARGS(portnum, portsc)
);
DEFINE_EVENT(xhci_log_portsc, xhci_hub_status_data,
TP_PROTO(u32 portnum, u32 portsc),
TP_ARGS(portnum, portsc)
);
DECLARE_EVENT_CLASS(xhci_log_doorbell,
TP_PROTO(u32 slot, u32 doorbell),
TP_ARGS(slot, doorbell),
TP_STRUCT__entry(
__field(u32, slot)
__field(u32, doorbell)
),
TP_fast_assign(
__entry->slot = slot;
__entry->doorbell = doorbell;
),
TP_printk("Ring doorbell for %s",
xhci_decode_doorbell(__get_buf(XHCI_MSG_MAX), __entry->slot, __entry->doorbell)
)
);
DEFINE_EVENT(xhci_log_doorbell, xhci_ring_ep_doorbell,
TP_PROTO(u32 slot, u32 doorbell),
TP_ARGS(slot, doorbell)
);
DEFINE_EVENT(xhci_log_doorbell, xhci_ring_host_doorbell,
TP_PROTO(u32 slot, u32 doorbell),
TP_ARGS(slot, doorbell)
);
DECLARE_EVENT_CLASS(xhci_dbc_log_request,
TP_PROTO(struct dbc_request *req),
TP_ARGS(req),
TP_STRUCT__entry(
__field(struct dbc_request *, req)
__field(bool, dir)
__field(unsigned int, actual)
__field(unsigned int, length)
__field(int, status)
),
TP_fast_assign(
__entry->req = req;
__entry->dir = req->direction;
__entry->actual = req->actual;
__entry->length = req->length;
__entry->status = req->status;
),
TP_printk("%s: req %p length %u/%u ==> %d",
__entry->dir ? "bulk-in" : "bulk-out",
__entry->req, __entry->actual,
__entry->length, __entry->status
)
);
DEFINE_EVENT(xhci_dbc_log_request, xhci_dbc_alloc_request,
TP_PROTO(struct dbc_request *req),
TP_ARGS(req)
);
DEFINE_EVENT(xhci_dbc_log_request, xhci_dbc_free_request,
TP_PROTO(struct dbc_request *req),
TP_ARGS(req)
);
DEFINE_EVENT(xhci_dbc_log_request, xhci_dbc_queue_request,
TP_PROTO(struct dbc_request *req),
TP_ARGS(req)
);
DEFINE_EVENT(xhci_dbc_log_request, xhci_dbc_giveback_request,
TP_PROTO(struct dbc_request *req),
TP_ARGS(req)
);
#endif /* __XHCI_TRACE_H */
/* this part must be outside header guard */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE xhci-trace
#include <trace/define_trace.h>
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