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hyperv/channel: Add debug sysctl nodes for channel indices
It would serve as a debug tool, if the shared buffer ring's indices stopped updating. Submitted by: HongJiang Zhang <honzhan microsoft com> Reviewed by: sephe, Jun Su <junsu microsoft com> Modified by: sephe MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5402
This commit is contained in:
Sepherosa Ziehau
parent
5fa2e9dd39
commit
77394b18ab
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=296181
@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/mbuf.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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@ -80,6 +81,68 @@ vmbus_channel_set_event(hv_vmbus_channel *channel)
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}
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static void
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hv_vmbus_channel_stat(hv_vmbus_channel* channel)
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{
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device_t dev;
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struct sysctl_oid *devch_sysctl;
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struct sysctl_oid *devch_id_sysctl, *devch_sub_sysctl;
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struct sysctl_oid *devch_id_in_sysctl, *devch_id_out_sysctl;
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struct sysctl_ctx_list *ctx;
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uint32_t ch_id;
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uint16_t sub_ch_id;
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char name[16];
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hv_vmbus_channel* primary_ch = channel->primary_channel;
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if (primary_ch == NULL) {
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dev = channel->device->device;
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ch_id = channel->offer_msg.child_rel_id;
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} else {
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dev = primary_ch->device->device;
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ch_id = primary_ch->offer_msg.child_rel_id;
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sub_ch_id = channel->offer_msg.offer.sub_channel_index;
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}
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ctx = device_get_sysctl_ctx(dev);
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/* This creates dev.DEVNAME.DEVUNIT.channel tree */
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devch_sysctl = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
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OID_AUTO, "channel", CTLFLAG_RD, 0, "");
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/* This creates dev.DEVNAME.DEVUNIT.channel.CHANID tree */
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snprintf(name, sizeof(name), "%d", ch_id);
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devch_id_sysctl = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(devch_sysctl),
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OID_AUTO, name, CTLFLAG_RD, 0, "");
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if (primary_ch != NULL) {
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devch_sub_sysctl = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(devch_id_sysctl),
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OID_AUTO, "sub", CTLFLAG_RD, 0, "");
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snprintf(name, sizeof(name), "%d", sub_ch_id);
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devch_id_sysctl = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(devch_sub_sysctl),
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OID_AUTO, name, CTLFLAG_RD, 0, "");
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}
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devch_id_in_sysctl = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(devch_id_sysctl),
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OID_AUTO,
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"in",
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CTLFLAG_RD, 0, "");
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devch_id_out_sysctl = SYSCTL_ADD_NODE(ctx,
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SYSCTL_CHILDREN(devch_id_sysctl),
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OID_AUTO,
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"out",
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CTLFLAG_RD, 0, "");
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hv_ring_buffer_stat(ctx,
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SYSCTL_CHILDREN(devch_id_in_sysctl),
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&(channel->inbound),
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"inbound ring buffer stats");
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hv_ring_buffer_stat(ctx,
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SYSCTL_CHILDREN(devch_id_out_sysctl),
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&(channel->outbound),
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"outbound ring buffer stats");
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}
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/**
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* @brief Open the specified channel
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*/
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@ -143,6 +206,9 @@ hv_vmbus_channel_open(
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in,
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recv_ring_buffer_size);
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/* setup statistic tracking for this channel */
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hv_vmbus_channel_stat(new_channel);
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/**
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* Establish the gpadl for the ring buffer
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*/
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@ -30,6 +30,7 @@
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sysctl.h>
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#include "hv_vmbus_priv.h"
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@ -37,6 +38,47 @@
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#define HV_BYTES_AVAIL_TO_WRITE(r, w, z) ((w) >= (r))? \
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((z) - ((w) - (r))):((r) - (w))
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static int
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hv_rbi_sysctl_stats(SYSCTL_HANDLER_ARGS)
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{
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hv_vmbus_ring_buffer_info* rbi;
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uint32_t read_index, write_index, interrupt_mask, sz;
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uint32_t read_avail, write_avail;
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char rbi_stats[256];
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rbi = (hv_vmbus_ring_buffer_info*)arg1;
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read_index = rbi->ring_buffer->read_index;
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write_index = rbi->ring_buffer->write_index;
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interrupt_mask = rbi->ring_buffer->interrupt_mask;
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sz = rbi->ring_data_size;
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write_avail = HV_BYTES_AVAIL_TO_WRITE(read_index,
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write_index, sz);
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read_avail = sz - write_avail;
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snprintf(rbi_stats, sizeof(rbi_stats),
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"r_idx:%d "
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"w_idx:%d "
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"int_mask:%d "
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"r_avail:%d "
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"w_avail:%d",
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read_index, write_index, interrupt_mask,
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read_avail, write_avail);
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return (sysctl_handle_string(oidp, rbi_stats,
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sizeof(rbi_stats), req));
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}
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void
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hv_ring_buffer_stat(
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struct sysctl_ctx_list *ctx,
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struct sysctl_oid_list *tree_node,
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hv_vmbus_ring_buffer_info *rbi,
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const char *desc)
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{
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SYSCTL_ADD_PROC(ctx, tree_node, OID_AUTO,
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"ring_buffer_stats",
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CTLTYPE_STRING|CTLFLAG_RD, rbi, 0,
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hv_rbi_sysctl_stats, "A", desc);
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}
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/**
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* @brief Get number of bytes available to read and to write to
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* for the specified ring buffer
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@ -639,6 +639,14 @@ extern hv_vmbus_channel_msg_table_entry g_channel_message_table[];
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/*
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* Private, VM Bus functions
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*/
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struct sysctl_ctx_list;
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struct sysctl_oid_list;
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void hv_ring_buffer_stat(
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struct sysctl_ctx_list *ctx,
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struct sysctl_oid_list *tree_node,
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hv_vmbus_ring_buffer_info *rbi,
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const char *desc);
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int hv_vmbus_ring_buffer_init(
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hv_vmbus_ring_buffer_info *ring_info,
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