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perf-eh_elf/util/intel-pt-decoder/intel-pt-pkt-decoder.c
Linus Torvalds 16c00db4bb Merge tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs 
Pull AFS fixes from David Howells:
 "Here's a set of patches that fix a number of bugs in the in-kernel AFS
  client, including:

   - Fix directory locking to not use individual page locks for
     directory reading/scanning but rather to use a semaphore on the
     afs_vnode struct as the directory contents must be read in a single
     blob and data from different reads must not be mixed as the entire
     contents may be shuffled about between reads.

   - Fix address list parsing to handle port specifiers correctly.

   - Only give up callback records on a server if we actually talked to
     that server (we might not be able to access a server).

   - Fix some callback handling bugs, including refcounting,
     whole-volume callbacks and when callbacks actually get broken in
     response to a CB.CallBack op.

   - Fix some server/address rotation bugs, including giving up if we
     can't probe a server; giving up if a server says it doesn't have a
     volume, but there are more servers to try.

   - Fix the decoding of fetched statuses to be OpenAFS compatible.

   - Fix the handling of server lookups in Cache Manager ops (such as
     CB.InitCallBackState3) to use a UUID if possible and to handle no
     server being found.

   - Fix a bug in server lookup where not all addresses are compared.

   - Fix the non-encryption of calls that prevents some servers from
     being accessed (this also requires an AF_RXRPC patch that has
     already gone in through the net tree).

  There's also a patch that adds tracepoints to log Cache Manager ops
  that don't find a matching server, either by UUID or by address"

* tag 'afs-fixes-20180514' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix the non-encryption of calls
  afs: Fix CB.CallBack handling
  afs: Fix whole-volume callback handling
  afs: Fix afs_find_server search loop
  afs: Fix the handling of an unfound server in CM operations
  afs: Add a tracepoint to record callbacks from unlisted servers
  afs: Fix the handling of CB.InitCallBackState3 to find the server by UUID
  afs: Fix VNOVOL handling in address rotation
  afs: Fix AFSFetchStatus decoder to provide OpenAFS compatibility
  afs: Fix server rotation's handling of fileserver probe failure
  afs: Fix refcounting in callback registration
  afs: Fix giving up callbacks on server destruction
  afs: Fix address list parsing
  afs: Fix directory page locking
2018-05-15 10:48:36 -07:00

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/*
* intel_pt_pkt_decoder.c: Intel Processor Trace support
* Copyright (c) 2013-2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <stdio.h>
#include <string.h>
#include <endian.h>
#include <byteswap.h>
#include <linux/compiler.h>
#include "intel-pt-pkt-decoder.h"
#define BIT(n) (1 << (n))
#define BIT63 ((uint64_t)1 << 63)
#define NR_FLAG BIT63
#if __BYTE_ORDER == __BIG_ENDIAN
#define le16_to_cpu bswap_16
#define le32_to_cpu bswap_32
#define le64_to_cpu bswap_64
#define memcpy_le64(d, s, n) do { \
memcpy((d), (s), (n)); \
*(d) = le64_to_cpu(*(d)); \
} while (0)
#else
#define le16_to_cpu
#define le32_to_cpu
#define le64_to_cpu
#define memcpy_le64 memcpy
#endif
static const char * const packet_name[] = {
[INTEL_PT_BAD] = "Bad Packet!",
[INTEL_PT_PAD] = "PAD",
[INTEL_PT_TNT] = "TNT",
[INTEL_PT_TIP_PGD] = "TIP.PGD",
[INTEL_PT_TIP_PGE] = "TIP.PGE",
[INTEL_PT_TSC] = "TSC",
[INTEL_PT_TMA] = "TMA",
[INTEL_PT_MODE_EXEC] = "MODE.Exec",
[INTEL_PT_MODE_TSX] = "MODE.TSX",
[INTEL_PT_MTC] = "MTC",
[INTEL_PT_TIP] = "TIP",
[INTEL_PT_FUP] = "FUP",
[INTEL_PT_CYC] = "CYC",
[INTEL_PT_VMCS] = "VMCS",
[INTEL_PT_PSB] = "PSB",
[INTEL_PT_PSBEND] = "PSBEND",
[INTEL_PT_CBR] = "CBR",
[INTEL_PT_TRACESTOP] = "TraceSTOP",
[INTEL_PT_PIP] = "PIP",
[INTEL_PT_OVF] = "OVF",
[INTEL_PT_MNT] = "MNT",
[INTEL_PT_PTWRITE] = "PTWRITE",
[INTEL_PT_PTWRITE_IP] = "PTWRITE",
[INTEL_PT_EXSTOP] = "EXSTOP",
[INTEL_PT_EXSTOP_IP] = "EXSTOP",
[INTEL_PT_MWAIT] = "MWAIT",
[INTEL_PT_PWRE] = "PWRE",
[INTEL_PT_PWRX] = "PWRX",
};
const char *intel_pt_pkt_name(enum intel_pt_pkt_type type)
{
return packet_name[type];
}
static int intel_pt_get_long_tnt(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
uint64_t payload;
int count;
if (len < 8)
return INTEL_PT_NEED_MORE_BYTES;
payload = le64_to_cpu(*(uint64_t *)buf);
for (count = 47; count; count--) {
if (payload & BIT63)
break;
payload <<= 1;
}
packet->type = INTEL_PT_TNT;
packet->count = count;
packet->payload = payload << 1;
return 8;
}
static int intel_pt_get_pip(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
uint64_t payload = 0;
if (len < 8)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_PIP;
memcpy_le64(&payload, buf + 2, 6);
packet->payload = payload >> 1;
if (payload & 1)
packet->payload |= NR_FLAG;
return 8;
}
static int intel_pt_get_tracestop(struct intel_pt_pkt *packet)
{
packet->type = INTEL_PT_TRACESTOP;
return 2;
}
static int intel_pt_get_cbr(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 4)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_CBR;
packet->payload = le16_to_cpu(*(uint16_t *)(buf + 2));
return 4;
}
static int intel_pt_get_vmcs(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
unsigned int count = (52 - 5) >> 3;
if (count < 1 || count > 7)
return INTEL_PT_BAD_PACKET;
if (len < count + 2)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_VMCS;
packet->count = count;
memcpy_le64(&packet->payload, buf + 2, count);
return count + 2;
}
static int intel_pt_get_ovf(struct intel_pt_pkt *packet)
{
packet->type = INTEL_PT_OVF;
return 2;
}
static int intel_pt_get_psb(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
int i;
if (len < 16)
return INTEL_PT_NEED_MORE_BYTES;
for (i = 2; i < 16; i += 2) {
if (buf[i] != 2 || buf[i + 1] != 0x82)
return INTEL_PT_BAD_PACKET;
}
packet->type = INTEL_PT_PSB;
return 16;
}
static int intel_pt_get_psbend(struct intel_pt_pkt *packet)
{
packet->type = INTEL_PT_PSBEND;
return 2;
}
static int intel_pt_get_tma(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 7)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_TMA;
packet->payload = buf[2] | (buf[3] << 8);
packet->count = buf[5] | ((buf[6] & BIT(0)) << 8);
return 7;
}
static int intel_pt_get_pad(struct intel_pt_pkt *packet)
{
packet->type = INTEL_PT_PAD;
return 1;
}
static int intel_pt_get_mnt(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 11)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_MNT;
memcpy_le64(&packet->payload, buf + 3, 8);
return 11
;
}
static int intel_pt_get_3byte(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 3)
return INTEL_PT_NEED_MORE_BYTES;
switch (buf[2]) {
case 0x88: /* MNT */
return intel_pt_get_mnt(buf, len, packet);
default:
return INTEL_PT_BAD_PACKET;
}
}
static int intel_pt_get_ptwrite(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
packet->count = (buf[1] >> 5) & 0x3;
packet->type = buf[1] & BIT(7) ? INTEL_PT_PTWRITE_IP :
INTEL_PT_PTWRITE;
switch (packet->count) {
case 0:
if (len < 6)
return INTEL_PT_NEED_MORE_BYTES;
packet->payload = le32_to_cpu(*(uint32_t *)(buf + 2));
return 6;
case 1:
if (len < 10)
return INTEL_PT_NEED_MORE_BYTES;
packet->payload = le64_to_cpu(*(uint64_t *)(buf + 2));
return 10;
default:
return INTEL_PT_BAD_PACKET;
}
}
static int intel_pt_get_exstop(struct intel_pt_pkt *packet)
{
packet->type = INTEL_PT_EXSTOP;
return 2;
}
static int intel_pt_get_exstop_ip(struct intel_pt_pkt *packet)
{
packet->type = INTEL_PT_EXSTOP_IP;
return 2;
}
static int intel_pt_get_mwait(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 10)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_MWAIT;
packet->payload = le64_to_cpu(*(uint64_t *)(buf + 2));
return 10;
}
static int intel_pt_get_pwre(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 4)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_PWRE;
memcpy_le64(&packet->payload, buf + 2, 2);
return 4;
}
static int intel_pt_get_pwrx(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 7)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_PWRX;
memcpy_le64(&packet->payload, buf + 2, 5);
return 7;
}
static int intel_pt_get_ext(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 2)
return INTEL_PT_NEED_MORE_BYTES;
if ((buf[1] & 0x1f) == 0x12)
return intel_pt_get_ptwrite(buf, len, packet);
switch (buf[1]) {
case 0xa3: /* Long TNT */
return intel_pt_get_long_tnt(buf, len, packet);
case 0x43: /* PIP */
return intel_pt_get_pip(buf, len, packet);
case 0x83: /* TraceStop */
return intel_pt_get_tracestop(packet);
case 0x03: /* CBR */
return intel_pt_get_cbr(buf, len, packet);
case 0xc8: /* VMCS */
return intel_pt_get_vmcs(buf, len, packet);
case 0xf3: /* OVF */
return intel_pt_get_ovf(packet);
case 0x82: /* PSB */
return intel_pt_get_psb(buf, len, packet);
case 0x23: /* PSBEND */
return intel_pt_get_psbend(packet);
case 0x73: /* TMA */
return intel_pt_get_tma(buf, len, packet);
case 0xC3: /* 3-byte header */
return intel_pt_get_3byte(buf, len, packet);
case 0x62: /* EXSTOP no IP */
return intel_pt_get_exstop(packet);
case 0xE2: /* EXSTOP with IP */
return intel_pt_get_exstop_ip(packet);
case 0xC2: /* MWAIT */
return intel_pt_get_mwait(buf, len, packet);
case 0x22: /* PWRE */
return intel_pt_get_pwre(buf, len, packet);
case 0xA2: /* PWRX */
return intel_pt_get_pwrx(buf, len, packet);
default:
return INTEL_PT_BAD_PACKET;
}
}
static int intel_pt_get_short_tnt(unsigned int byte,
struct intel_pt_pkt *packet)
{
int count;
for (count = 6; count; count--) {
if (byte & BIT(7))
break;
byte <<= 1;
}
packet->type = INTEL_PT_TNT;
packet->count = count;
packet->payload = (uint64_t)byte << 57;
return 1;
}
static int intel_pt_get_cyc(unsigned int byte, const unsigned char *buf,
size_t len, struct intel_pt_pkt *packet)
{
unsigned int offs = 1, shift;
uint64_t payload = byte >> 3;
byte >>= 2;
len -= 1;
for (shift = 5; byte & 1; shift += 7) {
if (offs > 9)
return INTEL_PT_BAD_PACKET;
if (len < offs)
return INTEL_PT_NEED_MORE_BYTES;
byte = buf[offs++];
payload |= (byte >> 1) << shift;
}
packet->type = INTEL_PT_CYC;
packet->payload = payload;
return offs;
}
static int intel_pt_get_ip(enum intel_pt_pkt_type type, unsigned int byte,
const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
int ip_len;
packet->count = byte >> 5;
switch (packet->count) {
case 0:
ip_len = 0;
break;
case 1:
if (len < 3)
return INTEL_PT_NEED_MORE_BYTES;
ip_len = 2;
packet->payload = le16_to_cpu(*(uint16_t *)(buf + 1));
break;
case 2:
if (len < 5)
return INTEL_PT_NEED_MORE_BYTES;
ip_len = 4;
packet->payload = le32_to_cpu(*(uint32_t *)(buf + 1));
break;
case 3:
case 4:
if (len < 7)
return INTEL_PT_NEED_MORE_BYTES;
ip_len = 6;
memcpy_le64(&packet->payload, buf + 1, 6);
break;
case 6:
if (len < 9)
return INTEL_PT_NEED_MORE_BYTES;
ip_len = 8;
packet->payload = le64_to_cpu(*(uint64_t *)(buf + 1));
break;
default:
return INTEL_PT_BAD_PACKET;
}
packet->type = type;
return ip_len + 1;
}
static int intel_pt_get_mode(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 2)
return INTEL_PT_NEED_MORE_BYTES;
switch (buf[1] >> 5) {
case 0:
packet->type = INTEL_PT_MODE_EXEC;
switch (buf[1] & 3) {
case 0:
packet->payload = 16;
break;
case 1:
packet->payload = 64;
break;
case 2:
packet->payload = 32;
break;
default:
return INTEL_PT_BAD_PACKET;
}
break;
case 1:
packet->type = INTEL_PT_MODE_TSX;
if ((buf[1] & 3) == 3)
return INTEL_PT_BAD_PACKET;
packet->payload = buf[1] & 3;
break;
default:
return INTEL_PT_BAD_PACKET;
}
return 2;
}
static int intel_pt_get_tsc(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 8)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_TSC;
memcpy_le64(&packet->payload, buf + 1, 7);
return 8;
}
static int intel_pt_get_mtc(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
if (len < 2)
return INTEL_PT_NEED_MORE_BYTES;
packet->type = INTEL_PT_MTC;
packet->payload = buf[1];
return 2;
}
static int intel_pt_do_get_packet(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
unsigned int byte;
memset(packet, 0, sizeof(struct intel_pt_pkt));
if (!len)
return INTEL_PT_NEED_MORE_BYTES;
byte = buf[0];
if (!(byte & BIT(0))) {
if (byte == 0)
return intel_pt_get_pad(packet);
if (byte == 2)
return intel_pt_get_ext(buf, len, packet);
return intel_pt_get_short_tnt(byte, packet);
}
if ((byte & 2))
return intel_pt_get_cyc(byte, buf, len, packet);
switch (byte & 0x1f) {
case 0x0D:
return intel_pt_get_ip(INTEL_PT_TIP, byte, buf, len, packet);
case 0x11:
return intel_pt_get_ip(INTEL_PT_TIP_PGE, byte, buf, len,
packet);
case 0x01:
return intel_pt_get_ip(INTEL_PT_TIP_PGD, byte, buf, len,
packet);
case 0x1D:
return intel_pt_get_ip(INTEL_PT_FUP, byte, buf, len, packet);
case 0x19:
switch (byte) {
case 0x99:
return intel_pt_get_mode(buf, len, packet);
case 0x19:
return intel_pt_get_tsc(buf, len, packet);
case 0x59:
return intel_pt_get_mtc(buf, len, packet);
default:
return INTEL_PT_BAD_PACKET;
}
default:
return INTEL_PT_BAD_PACKET;
}
}
int intel_pt_get_packet(const unsigned char *buf, size_t len,
struct intel_pt_pkt *packet)
{
int ret;
ret = intel_pt_do_get_packet(buf, len, packet);
if (ret > 0) {
while (ret < 8 && len > (size_t)ret && !buf[ret])
ret += 1;
}
return ret;
}
int intel_pt_pkt_desc(const struct intel_pt_pkt *packet, char *buf,
size_t buf_len)
{
int ret, i, nr;
unsigned long long payload = packet->payload;
const char *name = intel_pt_pkt_name(packet->type);
switch (packet->type) {
case INTEL_PT_BAD:
case INTEL_PT_PAD:
case INTEL_PT_PSB:
case INTEL_PT_PSBEND:
case INTEL_PT_TRACESTOP:
case INTEL_PT_OVF:
return snprintf(buf, buf_len, "%s", name);
case INTEL_PT_TNT: {
size_t blen = buf_len;
ret = snprintf(buf, blen, "%s ", name);
if (ret < 0)
return ret;
buf += ret;
blen -= ret;
for (i = 0; i < packet->count; i++) {
if (payload & BIT63)
ret = snprintf(buf, blen, "T");
else
ret = snprintf(buf, blen, "N");
if (ret < 0)
return ret;
buf += ret;
blen -= ret;
payload <<= 1;
}
ret = snprintf(buf, blen, " (%d)", packet->count);
if (ret < 0)
return ret;
blen -= ret;
return buf_len - blen;
}
case INTEL_PT_TIP_PGD:
case INTEL_PT_TIP_PGE:
case INTEL_PT_TIP:
case INTEL_PT_FUP:
if (!(packet->count))
return snprintf(buf, buf_len, "%s no ip", name);
__fallthrough;
case INTEL_PT_CYC:
case INTEL_PT_VMCS:
case INTEL_PT_MTC:
case INTEL_PT_MNT:
case INTEL_PT_CBR:
case INTEL_PT_TSC:
return snprintf(buf, buf_len, "%s 0x%llx", name, payload);
case INTEL_PT_TMA:
return snprintf(buf, buf_len, "%s CTC 0x%x FC 0x%x", name,
(unsigned)payload, packet->count);
case INTEL_PT_MODE_EXEC:
return snprintf(buf, buf_len, "%s %lld", name, payload);
case INTEL_PT_MODE_TSX:
return snprintf(buf, buf_len, "%s TXAbort:%u InTX:%u",
name, (unsigned)(payload >> 1) & 1,
(unsigned)payload & 1);
case INTEL_PT_PIP:
nr = packet->payload & NR_FLAG ? 1 : 0;
payload &= ~NR_FLAG;
ret = snprintf(buf, buf_len, "%s 0x%llx (NR=%d)",
name, payload, nr);
return ret;
case INTEL_PT_PTWRITE:
return snprintf(buf, buf_len, "%s 0x%llx IP:0", name, payload);
case INTEL_PT_PTWRITE_IP:
return snprintf(buf, buf_len, "%s 0x%llx IP:1", name, payload);
case INTEL_PT_EXSTOP:
return snprintf(buf, buf_len, "%s IP:0", name);
case INTEL_PT_EXSTOP_IP:
return snprintf(buf, buf_len, "%s IP:1", name);
case INTEL_PT_MWAIT:
return snprintf(buf, buf_len, "%s 0x%llx Hints 0x%x Extensions 0x%x",
name, payload, (unsigned int)(payload & 0xff),
(unsigned int)((payload >> 32) & 0x3));
case INTEL_PT_PWRE:
return snprintf(buf, buf_len, "%s 0x%llx HW:%u CState:%u Sub-CState:%u",
name, payload, !!(payload & 0x80),
(unsigned int)((payload >> 12) & 0xf),
(unsigned int)((payload >> 8) & 0xf));
case INTEL_PT_PWRX:
return snprintf(buf, buf_len, "%s 0x%llx Last CState:%u Deepest CState:%u Wake Reason 0x%x",
name, payload,
(unsigned int)((payload >> 4) & 0xf),
(unsigned int)(payload & 0xf),
(unsigned int)((payload >> 8) & 0xf));
default:
break;
}
return snprintf(buf, buf_len, "%s 0x%llx (%d)",
name, payload, packet->count);
}
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