perf-eh_elf/util/cs-etm-decoder/cs-etm-decoder.c

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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 19:48:36 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright(C) 2015-2018 Linaro Limited.
*
* Author: Tor Jeremiassen <tor@ti.com>
* Author: Mathieu Poirier <mathieu.poirier@linaro.org>
*/
#include <linux/err.h>
#include <linux/list.h>
#include <stdlib.h>
#include <opencsd/c_api/opencsd_c_api.h>
#include <opencsd/etmv4/trc_pkt_types_etmv4.h>
#include <opencsd/ocsd_if_types.h>
#include "cs-etm.h"
#include "cs-etm-decoder.h"
#include "intlist.h"
#include "util.h"
#define MAX_BUFFER 1024
/* use raw logging */
#ifdef CS_DEBUG_RAW
#define CS_LOG_RAW_FRAMES
#ifdef CS_RAW_PACKED
#define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT | \
OCSD_DFRMTR_PACKED_RAW_OUT)
#else
#define CS_RAW_DEBUG_FLAGS (OCSD_DFRMTR_UNPACKED_RAW_OUT)
#endif
#endif
struct cs_etm_decoder {
void *data;
void (*packet_printer)(const char *msg);
bool trace_on;
dcd_tree_handle_t dcd_tree;
cs_etm_mem_cb_type mem_access;
ocsd_datapath_resp_t prev_return;
u32 packet_count;
u32 head;
u32 tail;
struct cs_etm_packet packet_buffer[MAX_BUFFER];
};
static u32
cs_etm_decoder__mem_access(const void *context,
const ocsd_vaddr_t address,
const ocsd_mem_space_acc_t mem_space __maybe_unused,
const u32 req_size,
u8 *buffer)
{
struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;
return decoder->mem_access(decoder->data,
address,
req_size,
buffer);
}
int cs_etm_decoder__add_mem_access_cb(struct cs_etm_decoder *decoder,
u64 start, u64 end,
cs_etm_mem_cb_type cb_func)
{
decoder->mem_access = cb_func;
if (ocsd_dt_add_callback_mem_acc(decoder->dcd_tree, start, end,
OCSD_MEM_SPACE_ANY,
cs_etm_decoder__mem_access, decoder))
return -1;
return 0;
}
int cs_etm_decoder__reset(struct cs_etm_decoder *decoder)
{
ocsd_datapath_resp_t dp_ret;
decoder->prev_return = OCSD_RESP_CONT;
dp_ret = ocsd_dt_process_data(decoder->dcd_tree, OCSD_OP_RESET,
0, 0, NULL, NULL);
if (OCSD_DATA_RESP_IS_FATAL(dp_ret))
return -1;
return 0;
}
int cs_etm_decoder__get_packet(struct cs_etm_decoder *decoder,
struct cs_etm_packet *packet)
{
if (!decoder || !packet)
return -EINVAL;
/* Nothing to do, might as well just return */
if (decoder->packet_count == 0)
return 0;
*packet = decoder->packet_buffer[decoder->head];
decoder->head = (decoder->head + 1) & (MAX_BUFFER - 1);
decoder->packet_count--;
return 1;
}
static void cs_etm_decoder__gen_etmv4_config(struct cs_etm_trace_params *params,
ocsd_etmv4_cfg *config)
{
config->reg_configr = params->etmv4.reg_configr;
config->reg_traceidr = params->etmv4.reg_traceidr;
config->reg_idr0 = params->etmv4.reg_idr0;
config->reg_idr1 = params->etmv4.reg_idr1;
config->reg_idr2 = params->etmv4.reg_idr2;
config->reg_idr8 = params->etmv4.reg_idr8;
config->reg_idr9 = 0;
config->reg_idr10 = 0;
config->reg_idr11 = 0;
config->reg_idr12 = 0;
config->reg_idr13 = 0;
config->arch_ver = ARCH_V8;
config->core_prof = profile_CortexA;
}
static void cs_etm_decoder__print_str_cb(const void *p_context,
const char *msg,
const int str_len)
{
if (p_context && str_len)
((struct cs_etm_decoder *)p_context)->packet_printer(msg);
}
static int
cs_etm_decoder__init_def_logger_printing(struct cs_etm_decoder_params *d_params,
struct cs_etm_decoder *decoder)
{
int ret = 0;
if (d_params->packet_printer == NULL)
return -1;
decoder->packet_printer = d_params->packet_printer;
/*
* Set up a library default logger to process any printers
* (packet/raw frame) we add later.
*/
ret = ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);
if (ret != 0)
return -1;
/* no stdout / err / file output */
ret = ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);
if (ret != 0)
return -1;
/*
* Set the string CB for the default logger, passes strings to
* perf print logger.
*/
ret = ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
(void *)decoder,
cs_etm_decoder__print_str_cb);
if (ret != 0)
ret = -1;
return 0;
}
#ifdef CS_LOG_RAW_FRAMES
static void
cs_etm_decoder__init_raw_frame_logging(struct cs_etm_decoder_params *d_params,
struct cs_etm_decoder *decoder)
{
/* Only log these during a --dump operation */
if (d_params->operation == CS_ETM_OPERATION_PRINT) {
/* set up a library default logger to process the
* raw frame printer we add later
*/
ocsd_def_errlog_init(OCSD_ERR_SEV_ERROR, 1);
/* no stdout / err / file output */
ocsd_def_errlog_config_output(C_API_MSGLOGOUT_FLG_NONE, NULL);
/* set the string CB for the default logger,
* passes strings to perf print logger.
*/
ocsd_def_errlog_set_strprint_cb(decoder->dcd_tree,
(void *)decoder,
cs_etm_decoder__print_str_cb);
/* use the built in library printer for the raw frames */
ocsd_dt_set_raw_frame_printer(decoder->dcd_tree,
CS_RAW_DEBUG_FLAGS);
}
}
#else
static void
cs_etm_decoder__init_raw_frame_logging(
struct cs_etm_decoder_params *d_params __maybe_unused,
struct cs_etm_decoder *decoder __maybe_unused)
{
}
#endif
static int cs_etm_decoder__create_packet_printer(struct cs_etm_decoder *decoder,
const char *decoder_name,
void *trace_config)
{
u8 csid;
if (ocsd_dt_create_decoder(decoder->dcd_tree, decoder_name,
OCSD_CREATE_FLG_PACKET_PROC,
trace_config, &csid))
return -1;
if (ocsd_dt_set_pkt_protocol_printer(decoder->dcd_tree, csid, 0))
return -1;
return 0;
}
static int
cs_etm_decoder__create_etm_packet_printer(struct cs_etm_trace_params *t_params,
struct cs_etm_decoder *decoder)
{
const char *decoder_name;
ocsd_etmv4_cfg trace_config_etmv4;
void *trace_config;
switch (t_params->protocol) {
case CS_ETM_PROTO_ETMV4i:
cs_etm_decoder__gen_etmv4_config(t_params, &trace_config_etmv4);
decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
trace_config = &trace_config_etmv4;
break;
default:
return -1;
}
return cs_etm_decoder__create_packet_printer(decoder,
decoder_name,
trace_config);
}
static void cs_etm_decoder__clear_buffer(struct cs_etm_decoder *decoder)
{
int i;
decoder->head = 0;
decoder->tail = 0;
decoder->packet_count = 0;
for (i = 0; i < MAX_BUFFER; i++) {
decoder->packet_buffer[i].start_addr = 0xdeadbeefdeadbeefUL;
decoder->packet_buffer[i].end_addr = 0xdeadbeefdeadbeefUL;
decoder->packet_buffer[i].last_instr_taken_branch = false;
decoder->packet_buffer[i].exc = false;
decoder->packet_buffer[i].exc_ret = false;
decoder->packet_buffer[i].cpu = INT_MIN;
}
}
static ocsd_datapath_resp_t
cs_etm_decoder__buffer_packet(struct cs_etm_decoder *decoder,
const u8 trace_chan_id,
enum cs_etm_sample_type sample_type)
{
u32 et = 0;
struct int_node *inode = NULL;
if (decoder->packet_count >= MAX_BUFFER - 1)
return OCSD_RESP_FATAL_SYS_ERR;
/* Search the RB tree for the cpu associated with this traceID */
inode = intlist__find(traceid_list, trace_chan_id);
if (!inode)
return OCSD_RESP_FATAL_SYS_ERR;
et = decoder->tail;
et = (et + 1) & (MAX_BUFFER - 1);
decoder->tail = et;
decoder->packet_count++;
decoder->packet_buffer[et].sample_type = sample_type;
decoder->packet_buffer[et].exc = false;
decoder->packet_buffer[et].exc_ret = false;
decoder->packet_buffer[et].cpu = *((int *)inode->priv);
decoder->packet_buffer[et].start_addr = 0xdeadbeefdeadbeefUL;
decoder->packet_buffer[et].end_addr = 0xdeadbeefdeadbeefUL;
if (decoder->packet_count == MAX_BUFFER - 1)
return OCSD_RESP_WAIT;
return OCSD_RESP_CONT;
}
static ocsd_datapath_resp_t
cs_etm_decoder__buffer_range(struct cs_etm_decoder *decoder,
const ocsd_generic_trace_elem *elem,
const uint8_t trace_chan_id)
{
int ret = 0;
struct cs_etm_packet *packet;
ret = cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
CS_ETM_RANGE);
if (ret != OCSD_RESP_CONT && ret != OCSD_RESP_WAIT)
return ret;
packet = &decoder->packet_buffer[decoder->tail];
packet->start_addr = elem->st_addr;
packet->end_addr = elem->en_addr;
switch (elem->last_i_type) {
case OCSD_INSTR_BR:
case OCSD_INSTR_BR_INDIRECT:
packet->last_instr_taken_branch = elem->last_instr_exec;
break;
case OCSD_INSTR_ISB:
case OCSD_INSTR_DSB_DMB:
case OCSD_INSTR_OTHER:
default:
packet->last_instr_taken_branch = false;
break;
}
return ret;
}
static ocsd_datapath_resp_t
cs_etm_decoder__buffer_trace_on(struct cs_etm_decoder *decoder,
const uint8_t trace_chan_id)
{
return cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
CS_ETM_TRACE_ON);
}
static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
const void *context,
const ocsd_trc_index_t indx __maybe_unused,
const u8 trace_chan_id __maybe_unused,
const ocsd_generic_trace_elem *elem)
{
ocsd_datapath_resp_t resp = OCSD_RESP_CONT;
struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;
switch (elem->elem_type) {
case OCSD_GEN_TRC_ELEM_UNKNOWN:
break;
case OCSD_GEN_TRC_ELEM_NO_SYNC:
decoder->trace_on = false;
break;
case OCSD_GEN_TRC_ELEM_TRACE_ON:
resp = cs_etm_decoder__buffer_trace_on(decoder,
trace_chan_id);
decoder->trace_on = true;
break;
case OCSD_GEN_TRC_ELEM_INSTR_RANGE:
resp = cs_etm_decoder__buffer_range(decoder, elem,
trace_chan_id);
break;
case OCSD_GEN_TRC_ELEM_EXCEPTION:
decoder->packet_buffer[decoder->tail].exc = true;
break;
case OCSD_GEN_TRC_ELEM_EXCEPTION_RET:
decoder->packet_buffer[decoder->tail].exc_ret = true;
break;
case OCSD_GEN_TRC_ELEM_PE_CONTEXT:
case OCSD_GEN_TRC_ELEM_EO_TRACE:
case OCSD_GEN_TRC_ELEM_ADDR_NACC:
case OCSD_GEN_TRC_ELEM_TIMESTAMP:
case OCSD_GEN_TRC_ELEM_CYCLE_COUNT:
case OCSD_GEN_TRC_ELEM_ADDR_UNKNOWN:
case OCSD_GEN_TRC_ELEM_EVENT:
case OCSD_GEN_TRC_ELEM_SWTRACE:
case OCSD_GEN_TRC_ELEM_CUSTOM:
default:
break;
}
return resp;
}
static int cs_etm_decoder__create_etm_packet_decoder(
struct cs_etm_trace_params *t_params,
struct cs_etm_decoder *decoder)
{
const char *decoder_name;
ocsd_etmv4_cfg trace_config_etmv4;
void *trace_config;
u8 csid;
switch (t_params->protocol) {
case CS_ETM_PROTO_ETMV4i:
cs_etm_decoder__gen_etmv4_config(t_params, &trace_config_etmv4);
decoder_name = OCSD_BUILTIN_DCD_ETMV4I;
trace_config = &trace_config_etmv4;
break;
default:
return -1;
}
if (ocsd_dt_create_decoder(decoder->dcd_tree,
decoder_name,
OCSD_CREATE_FLG_FULL_DECODER,
trace_config, &csid))
return -1;
if (ocsd_dt_set_gen_elem_outfn(decoder->dcd_tree,
cs_etm_decoder__gen_trace_elem_printer,
decoder))
return -1;
return 0;
}
static int
cs_etm_decoder__create_etm_decoder(struct cs_etm_decoder_params *d_params,
struct cs_etm_trace_params *t_params,
struct cs_etm_decoder *decoder)
{
if (d_params->operation == CS_ETM_OPERATION_PRINT)
return cs_etm_decoder__create_etm_packet_printer(t_params,
decoder);
else if (d_params->operation == CS_ETM_OPERATION_DECODE)
return cs_etm_decoder__create_etm_packet_decoder(t_params,
decoder);
return -1;
}
struct cs_etm_decoder *
cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params,
struct cs_etm_trace_params t_params[])
{
struct cs_etm_decoder *decoder;
ocsd_dcd_tree_src_t format;
u32 flags;
int i, ret;
if ((!t_params) || (!d_params))
return NULL;
decoder = zalloc(sizeof(*decoder));
if (!decoder)
return NULL;
decoder->data = d_params->data;
decoder->prev_return = OCSD_RESP_CONT;
cs_etm_decoder__clear_buffer(decoder);
format = (d_params->formatted ? OCSD_TRC_SRC_FRAME_FORMATTED :
OCSD_TRC_SRC_SINGLE);
flags = 0;
flags |= (d_params->fsyncs ? OCSD_DFRMTR_HAS_FSYNCS : 0);
flags |= (d_params->hsyncs ? OCSD_DFRMTR_HAS_HSYNCS : 0);
flags |= (d_params->frame_aligned ? OCSD_DFRMTR_FRAME_MEM_ALIGN : 0);
/*
* Drivers may add barrier frames when used with perf, set up to
* handle this. Barriers const of FSYNC packet repeated 4 times.
*/
flags |= OCSD_DFRMTR_RESET_ON_4X_FSYNC;
/* Create decode tree for the data source */
decoder->dcd_tree = ocsd_create_dcd_tree(format, flags);
if (decoder->dcd_tree == 0)
goto err_free_decoder;
/* init library print logging support */
ret = cs_etm_decoder__init_def_logger_printing(d_params, decoder);
if (ret != 0)
goto err_free_decoder_tree;
/* init raw frame logging if required */
cs_etm_decoder__init_raw_frame_logging(d_params, decoder);
for (i = 0; i < num_cpu; i++) {
ret = cs_etm_decoder__create_etm_decoder(d_params,
&t_params[i],
decoder);
if (ret != 0)
goto err_free_decoder_tree;
}
return decoder;
err_free_decoder_tree:
ocsd_destroy_dcd_tree(decoder->dcd_tree);
err_free_decoder:
free(decoder);
return NULL;
}
int cs_etm_decoder__process_data_block(struct cs_etm_decoder *decoder,
u64 indx, const u8 *buf,
size_t len, size_t *consumed)
{
int ret = 0;
ocsd_datapath_resp_t cur = OCSD_RESP_CONT;
ocsd_datapath_resp_t prev_return = decoder->prev_return;
size_t processed = 0;
u32 count;
while (processed < len) {
if (OCSD_DATA_RESP_IS_WAIT(prev_return)) {
cur = ocsd_dt_process_data(decoder->dcd_tree,
OCSD_OP_FLUSH,
0,
0,
NULL,
NULL);
} else if (OCSD_DATA_RESP_IS_CONT(prev_return)) {
cur = ocsd_dt_process_data(decoder->dcd_tree,
OCSD_OP_DATA,
indx + processed,
len - processed,
&buf[processed],
&count);
processed += count;
} else {
ret = -EINVAL;
break;
}
/*
* Return to the input code if the packet buffer is full.
* Flushing will get done once the packet buffer has been
* processed.
*/
if (OCSD_DATA_RESP_IS_WAIT(cur))
break;
prev_return = cur;
}
decoder->prev_return = cur;
*consumed = processed;
return ret;
}
void cs_etm_decoder__free(struct cs_etm_decoder *decoder)
{
if (!decoder)
return;
ocsd_destroy_dcd_tree(decoder->dcd_tree);
decoder->dcd_tree = NULL;
free(decoder);
}