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0fd102707d
Comes from 03490297.diff in mail "241108: 21:51: ARM support: Inchara: ".
The original patch contains the following information:
{
Subject: [PATCH] [Official] GPUCORE-43479 Using Upstream For MT Unmapped Area Topdown-Search
This commit addresses the unmapped area search not ending its loop
operation issue. The change applies the upstream vm_unmapped_area()
with Maple-Tree (kernel 6.1.x) for search operations and then uses
a kbase specific adjustment loop for revisions to meet some extra
hardware alignment constraints.
}
The "not ending its loop operation issue" is reflected in various RK tests as
a "rcu_sched self-detected stall on CPU" with a call trace within Mali driver.
An instance:
[ 1442.379022] rcu: INFO: rcu_sched self-detected stall on CPU
[ 1442.379028] rcu: 4-....: (14999 ticks this GP) idle=a8b4/1/0x4000000000000000 softirq=152230/152230 fqs=7492
[ 1442.379033] (t=15000 jiffies g=391269 q=378 ncpus=8)
[ 1442.379038] CPU: 4 PID: 1456 Comm: glmark2-es2-way Not tainted 6.1.99 #406
[ 1442.379041] Hardware name: Rockchip RK3588 EVB7 V11 Board (DT)
[ 1442.379044] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 1442.379047] pc : mas_empty_area_rev+0x150/0x540
[ 1442.379054] lr : mas_empty_area_rev+0x198/0x540
[ 1442.379056] sp : ffffffc00f6ebae0
...
[ 1442.379097] Call trace:
[ 1442.379099] mas_empty_area_rev+0x150/0x540
[ 1442.379102] kbase_unmapped_area_topdown+0x144/0x264
[ 1442.379107] kbase_context_get_unmapped_area+0x244/0x2ec
[ 1442.379111] kbase_get_unmapped_area+0x48/0x70
[ 1442.379116] get_unmapped_area+0x5c/0x100
[ 1442.379121] do_mmap+0xe0/0x450
[ 1442.379124] vm_mmap_pgoff+0xa0/0x150
[ 1442.379128] ksys_mmap_pgoff+0x9c/0xd0
[ 1442.379132] __arm64_sys_mmap+0x34/0x44
[ 1442.379136] invoke_syscall+0x4c/0x114
[ 1442.379141] el0_svc_common.constprop.0+0x54/0x180
[ 1442.379144] do_el0_svc+0x20/0x2c
[ 1442.379148] el0_svc+0x14/0x80
[ 1442.379151] el0t_64_sync_handler+0xb0/0xb4
[ 1442.379155] el0t_64_sync+0x158/0x15c
[ 1442.379158]
[ 1442.379158] PC: 0xffffffc009375950:
...
Change-Id: I6c5b1d37cf7f0853282126c23ce779032b7fabe7
Signed-off-by: Zhen Chen <chenzhen@rock-chips.com>
Linux kernel
============
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In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.