From 4226f09937d88d4fabededea7400566c7b7eb2b6 Mon Sep 17 00:00:00 2001
From: Ritesh Harjani <riteshh@codeaurora.org>
Date: Sat, 11 Mar 2017 17:09:35 +0530
Subject: [PATCH] lrdp-v2: mmcdoctor: Add support to extract mmc ring buffer.
Starting from sdm660(kernel version 4.4) mmc driver keeps last 64
mmc trace events in ring buffer.
This patch adds the support to extract it to mmcreport.txt
for both mmc0/mmc1.
Change-Id: I4b1d95106cbdd7262afe604a289ce2ebc59ccc52
---
linux-ramdump-parser-v2/parsers/mmcdoctor.py | 42 ++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/linux-ramdump-parser-v2/parsers/mmcdoctor.py b/linux-ramdump-parser-v2/parsers/mmcdoctor.py
index 6ff28ca..0e40051 100644
--- a/linux-ramdump-parser-v2/parsers/mmcdoctor.py
+++ b/linux-ramdump-parser-v2/parsers/mmcdoctor.py
@@ -30,6 +30,10 @@ PATTERN_END = "sdhci: ===================="
MMC_DATA_HEAD = "#################### MMC(mmc%d) INFO START #######################\n"
MMC_DATA_FOOT = "#################### MMC(mmc%d) INFO END #########################\n\n"
+MMC_TRACE_HEADER = "\n################ MMC(mmc%d) RING BUFFER ################\n"
+MMC_TRACE_BUF_EVENTS = 64
+MMC_TRACE_EVENT_SIZE = 256
+
card_data = {
0x2: "SANDISK",
0x11: "TOSHIBA",
@@ -264,6 +268,43 @@ class MmcDataStructure():
self.parse = ParseMmcLog(self.ramdump)
return
+ def dump_trace_buf(self, fd):
+ if (not self.mmc_host or (fd <= 0) or (self.ramdump.kernel_version < (4, 4))):
+ return
+ mmc_host = self.mmc_host
+ ramdump = self.ramdump
+
+ fd.write(MMC_TRACE_HEADER % self.index)
+ buf_offset = ramdump.field_offset('struct mmc_host', 'trace_buf')
+ if (not buf_offset):
+ return 0
+
+ data_offset = ramdump.field_offset('struct mmc_trace_buffer', 'data')
+ if (not data_offset):
+ return 0
+
+ trace_buf = mmc_host + buf_offset
+ wr_idx = ramdump.read_int(trace_buf)
+ if (wr_idx >= 0xFFFFFFFF):
+ fd.write("mmc%d trace buffer empty\n" %(self.index))
+ return 0
+
+ dataptr = ramdump.read_word(trace_buf + data_offset)
+ if (not dataptr):
+ return
+
+ datastr = []
+ for i in xrange(MMC_TRACE_BUF_EVENTS):
+ trace_str = ramdump.read_cstring(dataptr, MMC_TRACE_EVENT_SIZE)
+ dataptr += MMC_TRACE_EVENT_SIZE
+ datastr.append(trace_str)
+ num = MMC_TRACE_BUF_EVENTS - 1
+ idx = wr_idx & num
+ cur_idx = (idx + 1) & num
+ for i in xrange(MMC_TRACE_BUF_EVENTS):
+ fd.write("event[%d] = %s" %(cur_idx, datastr[cur_idx]))
+ cur_idx = (cur_idx + 1 ) & num
+
def dump_data(self, mode):
fd = self.ramdump.open_file(F_MMCDEBUG, mode)
fd.write(MMC_DATA_HEAD % self.index)
@@ -286,6 +327,7 @@ class MmcDataStructure():
fd.write("Host ios_timing = %d\n" %self.hostinfo.ios_timing)
fd.write("Host ios_signal_voltage = %d\n" %self.hostinfo.ios_signal_voltage)
fd.write("Host ios_drv_type = %d\n" %self.hostinfo.ios_drv_type)
+ self.dump_trace_buf(fd)
fd.write(MMC_DATA_FOOT % self.index)
fd.close()
return
--
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