linux-kernel - Re: [PATCH v2] bus: mhi: host: don't free bhie tables during suspend/hibernation

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Message-ID: <6a2ad952-6a34-40d2-a6bc-f0f505fb9667@collabora.com>
Date: Fri, 11 Apr 2025 23:47:52 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Johannes Berg <johannes@...solutions.net>, Jeff Johnson
 <jjohnson@...nel.org>, Jeffrey Hugo <quic_jhugo@...cinc.com>,
 Yan Zhen <yanzhen@...o.com>, Youssef Samir <quic_yabdulra@...cinc.com>,
 Qiang Yu <quic_qianyu@...cinc.com>, Alex Elder <elder@...nel.org>,
 Kunwu Chan <chentao@...inos.cn>, kernel@...labora.com, mhi@...ts.linux.dev,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-wireless@...r.kernel.org, ath11k@...ts.infradead.org
Subject: Re: [PATCH v2] bus: mhi: host: don't free bhie tables during
 suspend/hibernation

On 4/10/25 10:00 PM, Greg Kroah-Hartman wrote:
> On Thu, Apr 10, 2025 at 07:56:54PM +0500, Muhammad Usama Anjum wrote:
>> Fix dma_direct_alloc() failure at resume time during bhie_table
>> allocation. There is a crash report where at resume time, the memory
>> from the dma doesn't get allocated and MHI fails to re-initialize.
>> There may be fragmentation of some kind which fails the allocation
>> call.
>>
>> To fix it, don't free the memory at power down during suspend /
>> hibernation. Instead, use the same allocated memory again after every
>> resume / hibernation. This patch has been tested with resume and
>> hibernation both.
>>
>> The rddm is of constant size for a given hardware. While the fbc_image
>> size depends on the firmware. If the firmware changes, we'll free and
>> allocate new memory for it.
>>
>> Here are the crash logs:
>>
>> [ 3029.338587] mhi mhi0: Requested to power ON
>> [ 3029.338621] mhi mhi0: Power on setup success
>> [ 3029.668654] kworker/u33:8: page allocation failure: order:7, mode:0xc04(GFP_NOIO|GFP_DMA32), nodemask=(null),cpuset=/,mems_allowed=0
>> [ 3029.668682] CPU: 4 UID: 0 PID: 2744 Comm: kworker/u33:8 Not tainted 6.11.11-valve10-1-neptune-611-gb69e902b4338 #1ed779c892334112fb968aaa3facf9686b5ff0bd7
>> [ 3029.668690] Hardware name: Valve Galileo/Galileo, BIOS F7G0112 08/01/2024
>> [ 3029.668694] Workqueue: mhi_hiprio_wq mhi_pm_st_worker [mhi]
>> [ 3029.668717] Call Trace:
>> [ 3029.668722]  <TASK>
>> [ 3029.668728]  dump_stack_lvl+0x4e/0x70
>> [ 3029.668738]  warn_alloc+0x164/0x190
>> [ 3029.668747]  ? srso_return_thunk+0x5/0x5f
>> [ 3029.668754]  ? __alloc_pages_direct_compact+0xaf/0x360
>> [ 3029.668761]  __alloc_pages_slowpath.constprop.0+0xc75/0xd70
>> [ 3029.668774]  __alloc_pages_noprof+0x321/0x350
>> [ 3029.668782]  __dma_direct_alloc_pages.isra.0+0x14a/0x290
>> [ 3029.668790]  dma_direct_alloc+0x70/0x270
>> [ 3029.668796]  mhi_alloc_bhie_table+0xe8/0x190 [mhi faa917c5aa23a5f5b12d6a2c597067e16d2fedc0]
>> [ 3029.668814]  mhi_fw_load_handler+0x1bc/0x310 [mhi faa917c5aa23a5f5b12d6a2c597067e16d2fedc0]
>> [ 3029.668830]  mhi_pm_st_worker+0x5c8/0xaa0 [mhi faa917c5aa23a5f5b12d6a2c597067e16d2fedc0]
>> [ 3029.668844]  ? srso_return_thunk+0x5/0x5f
>> [ 3029.668853]  process_one_work+0x17e/0x330
>> [ 3029.668861]  worker_thread+0x2ce/0x3f0
>> [ 3029.668868]  ? __pfx_worker_thread+0x10/0x10
>> [ 3029.668873]  kthread+0xd2/0x100
>> [ 3029.668879]  ? __pfx_kthread+0x10/0x10
>> [ 3029.668885]  ret_from_fork+0x34/0x50
>> [ 3029.668892]  ? __pfx_kthread+0x10/0x10
>> [ 3029.668898]  ret_from_fork_asm+0x1a/0x30
>> [ 3029.668910]  </TASK>
>>
>> Tested-on: QCNFA765 WLAN.HSP.1.1-03926.13-QCAHSPSWPL_V2_SILICONZ_CE-2.52297.6
>>
>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
>> ---
>> Changes sice v1:
>> - Don't free bhie tables during suspend/hibernation only
>> - Handle fbc_image changed size correctly
>> - Remove fbc_image getting set to NULL in *free_bhie_table()
> 
> What commit id does this fix?
I think, these errors are happening because of the fragmentation. So
this patch is doing an improvement. Its hard to call it a fix for
something already added.

The following patch had added fbc_image allocation:
cd457afb1667
bus: mhi: core: Add support for downloading firmware over BHIe

The following commit had added rddm allocation:
3215d8e0691b
bus: mhi: core: Set BHI/BHIe offsets on power up preparation

Even if I want to add a fixes-by tag, it would be difficult to decide
which commit to chose. Maybe we divide the patch into 2 in these
scenarios or just select the earlier commit in Fixes tag. Please suggest
what is best way?

> 
> thanks,
> 
> greg k-h
> 


-- 
Regards,
Usama