Hi,
Thank you for your answers.
1) I updated to the acme's "perf/core" branch, and it's still not solved. I still don't get any events for my recorded traces, except if i record "uname -r".
2) I'm trying to integrate directly with OpenCSD, and decode my own traces. I took the "perf.data" file from the HOWTO.md, which contains a valid trace according to the HOWTO, and extracted the trace itself from the perf file. I have a raw trace file without any perf related data and structures. I'm trying to open my own decoder, and decode instructions, after taking examples from "tools/perf/util/cs-etm-decoder/cs-etm-decoder.c", "tools/perf/util/cs-etm.c". There is no documentation on how to use OpenCSD as a library, nothing(full, not partial like the docs in the repo) that i found at least.
This is a very short example of what i do(same order that they appear in the code) to create a dcd tree, and create a decoder, ignore the error validation right now, they are there, i'm making sure this message is short as possible:
/* Open a decoder tree */ flags |= OCSD_DFRMTR_FRAME_MEM_ALIGN; flags |= OCSD_DFRMTR_RESET_ON_4X_FSYNC; decoder_tree = ocsd_create_dcd_tree(OCSD_TRC_SRC_FRAME_FORMATTED, OCSD_DFRMTR_RESET_ON_4X_FSYNC);
/* Create a __full__ decoder */
config.arch_ver = ARCH_V8; config.core_prof = profile_CortexA; config.reg_traceidr = 18; /* specific hard coded trace id to beindentical to perf, just to check if it works */ ocsd_err = ocsd_dt_create_decoder(decoder_tree, OCSD_BUILTIN_DCD_ETMV4I,
OCSD_CREATE_FLG_FULL_DECODER, &config, &csid);
/* Register my element callback */
ocsd_err = ocsd_dt_set_gen_elem_outfn(decoder_tree,decoder_callback, NULL);
Now i mmap() my trace file.. and do the following:
/* Reset the decoder */
val = ocsd_dt_process_data(dcd_tree, OCSD_OP_RESET, 0, 0, NULL, NULL); if (OCSD_DATA_RESP_IS_FATAL(val)) { return -1; }
From here now, i call ocsd_dt_process_data() to fully decode the trace,
just like the code in cs_etm_decoder__process_data_block() in "tools/perf/util/cs-etm-decoder/cs-etm-decoder.c:518". The problem is, the resetting of the decoder fails fatally in the "OCSD_DATA_RESP_IS_FATAL" macro with the error: "OCSD_RESP_FATAL_NOT_INIT". Not sure what i did wrong, as i followed the exact code like in perf.
Any suggestions? Thank you!
Cheers, Mike.
On Thu, Mar 22, 2018 at 4:21 PM, Leo Yan leo.yan@linaro.org wrote:
On Thu, Mar 22, 2018 at 05:03:48PM +0800, Kim Phillips wrote:
On Thu, 22 Mar 2018 07:52:15 +0000 Mike Leach mike.leach@linaro.org wrote:
Hi, sorry, just jumping in with a couple of extra recommendations...
On 20 March 2018 at 15:34, Mike Bazov mike@perception-point.io
wrote:
Thank you for your answers. I fixed the issue by applying the patches in the pull-request. I'm
not
If this means you cherry-picked them without rebasing them onto a very late version of perf, then please do that, too. Preferably this one:
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
because it's perf/core branch contains some recent fixes in the area.
+1. Before I encountered quite similiar issue with you [1]; after I used acme branch, then kernel symbol issue can be fixed.
[1] https://patchwork.kernel.org/patch/10115523/
Thanks, Leo Yan