From 637041f47e19745d8e13c6374ff19145c5193790 Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan@google.com>
Date: Fri, 7 May 2021 12:57:44 -0700
Subject: [PATCH] init.gs101.rc: dump page_pinner information into bugreport

Dump page_pinner information into dumpstate_board.txt.
It helps to find vulnerable place of CMA failure.

Page pinned ts 13 us count 0
PFN 10292273 Block 10051 type CMA Flags 0x8000000000080024(uptodate|active|swapbacked)
 try_grab_page+0x168/0x17c
 follow_page_pte+0x2e4/0x4c8
 follow_pmd_mask+0x180/0x498
 __get_user_pages+0x1a0/0x42c
 __get_user_pages_remote+0xa4/0x28c
 get_user_pages_remote+0x20/0x48
 copy_strings+0x188/0x2ac
 do_execveat_common+0x278/0x300
 __arm64_sys_execve+0x44/0x5c
 el0_svc_common+0xa4/0x180
 do_el0_svc+0x28/0x88
 el0_svc+0x14/0x24
 el0_sync_handler+0x88/0xec
 el0_sync+0x19c/0x1c0

Page pinned ts 2 us count 0
PFN 10436170 Block 10191 type CMA Flags 0x8000000000080026(referenced|uptodate|active|swapbacked)
 try_grab_page+0x168/0x17c
 follow_page_pte+0x2e4/0x4c8
 follow_pmd_mask+0x180/0x498
 __get_user_pages+0x1a0/0x42c
 __get_user_pages_remote+0xa4/0x28c
 get_user_pages_remote+0x20/0x48
 copy_strings+0x188/0x2ac
 do_execveat_common+0x290/0x300
 __arm64_sys_execve+0x44/0x5c
 el0_svc_common+0xa4/0x180
 do_el0_svc+0x28/0x88
 el0_svc+0x14/0x24
 el0_sync_handler+0x88/0xec
 el0_sync+0x19c/0x1c0

Bug: 187552095
Test: adb bugreport <zip> and confirmed it contains page_pinner
      information.

Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: I59bd41ad9e06cab0348ce85059f73d0796632868
---
 conf/init.gs101.rc            | 4 ++++
 dumpstate/DumpstateDevice.cpp | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/conf/init.gs101.rc b/conf/init.gs101.rc
index 2fa52ade..1952f1c5 100644
--- a/conf/init.gs101.rc
+++ b/conf/init.gs101.rc
@@ -62,6 +62,10 @@ on init
     write /sys/block/zram0/comp_algorithm lz77eh
     write /proc/sys/vm/page-cluster 0
 
+    # Page Pinner dumping at bugreport
+    chown system system /sys/kernel/debug/page_pinner/longterm_pinner
+    chown system system /sys/kernel/debug/page_pinner/alloc_contig_failed
+
     # Some user code relies on ro.boot.hardware.revision
     setprop ro.boot.hardware.revision ${ro.revision}
 
diff --git a/dumpstate/DumpstateDevice.cpp b/dumpstate/DumpstateDevice.cpp
index a14b7891..8a2b0ed3 100644
--- a/dumpstate/DumpstateDevice.cpp
+++ b/dumpstate/DumpstateDevice.cpp
@@ -697,6 +697,8 @@ void DumpstateDevice::dumpMemorySection(int fd) {
                         "fi; "
                         "done"});
     DumpFileToFd(fd, "dmabuf info", "/d/dma_buf/bufinfo");
+    DumpFileToFd(fd, "Page Pinner - longterm pin", "/sys/kernel/debug/page_pinner/longterm_pinner");
+    DumpFileToFd(fd, "Page Pinner - alloc_contig_failed", "/sys/kernel/debug/page_pinner/alloc_contig_failed");
 }
 
 static void DumpF2FS(int fd) {