From: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
To: Muhammad Usama Anjum <usama.anjum@collabora.com>,
Manivannan Sadhasivam <mani@kernel.org>,
Jeff Hugo <jeff.hugo@oss.qualcomm.com>,
Youssef Samir <quic_yabdulra@quicinc.com>,
Matthew Leung <quic_mattleun@quicinc.com>,
Alexander Wilhelm <alexander.wilhelm@westermo.com>,
Kunwu Chan <chentao@kylinos.cn>,
Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>,
Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>,
Yan Zhen <yanzhen@vivo.com>, Sujeev Dias <sdias@codeaurora.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Siddartha Mohanadoss <smohanad@codeaurora.org>,
mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: kernel@collabora.com, stable@vger.kernel.org
Subject: Re: [PATCH v2 1/3] bus: mhi: host: keep bhi buffer through suspend cycle
Date: Wed, 16 Jul 2025 11:41:11 +0800 [thread overview]
Message-ID: <05afc25c-f5ab-4382-8b66-c47a6ea2fa2f@oss.qualcomm.com> (raw)
In-Reply-To: <20250715132509.2643305-2-usama.anjum@collabora.com>
On 7/15/2025 9:25 PM, Muhammad Usama Anjum wrote:
> When there is memory pressure, at resume time dma_alloc_coherent()
> returns error which in turn fails the loading of firmware and hence
> the driver crashes:
>
> kernel: kworker/u33:5: page allocation failure: order:7,
> mode:0xc04(GFP_NOIO|GFP_DMA32), nodemask=(null),cpuset=/,mems_allowed=0
> kernel: CPU: 1 UID: 0 PID: 7693 Comm: kworker/u33:5 Not tainted 6.11.11-valve17-1-neptune-611-g027868a0ac03 #1 3843143b92e9da0fa2d3d5f21f51beaed15c7d59
> kernel: Hardware name: Valve Galileo/Galileo, BIOS F7G0112 08/01/2024
> kernel: Workqueue: mhi_hiprio_wq mhi_pm_st_worker [mhi]
> kernel: Call Trace:
> kernel: <TASK>
> kernel: dump_stack_lvl+0x4e/0x70
> kernel: warn_alloc+0x164/0x190
> kernel: ? srso_return_thunk+0x5/0x5f
> kernel: ? __alloc_pages_direct_compact+0xaf/0x360
> kernel: __alloc_pages_slowpath.constprop.0+0xc75/0xd70
> kernel: __alloc_pages_noprof+0x321/0x350
> kernel: __dma_direct_alloc_pages.isra.0+0x14a/0x290
> kernel: dma_direct_alloc+0x70/0x270
> kernel: mhi_fw_load_handler+0x126/0x340 [mhi a96cb91daba500cc77f86bad60c1f332dc3babdf]
> kernel: mhi_pm_st_worker+0x5e8/0xac0 [mhi a96cb91daba500cc77f86bad60c1f332dc3babdf]
> kernel: ? srso_return_thunk+0x5/0x5f
> kernel: process_one_work+0x17e/0x330
> kernel: worker_thread+0x2ce/0x3f0
> kernel: ? __pfx_worker_thread+0x10/0x10
> kernel: kthread+0xd2/0x100
> kernel: ? __pfx_kthread+0x10/0x10
> kernel: ret_from_fork+0x34/0x50
> kernel: ? __pfx_kthread+0x10/0x10
> kernel: ret_from_fork_asm+0x1a/0x30
> kernel: </TASK>
> kernel: Mem-Info:
> kernel: active_anon:513809 inactive_anon:152 isolated_anon:0
> active_file:359315 inactive_file:2487001 isolated_file:0
> unevictable:637 dirty:19 writeback:0
> slab_reclaimable:160391 slab_unreclaimable:39729
> mapped:175836 shmem:51039 pagetables:4415
> sec_pagetables:0 bounce:0
> kernel_misc_reclaimable:0
> free:125666 free_pcp:0 free_cma:0
>
> In above example, if we sum all the consumed memory, it comes out
> to be 15.5GB and free memory is ~ 500MB from a total of 16GB RAM.
> Even though memory is present. But all of the dma memory has been
> exhausted or fragmented.
>
> Fix it by allocating it only once and then reuse the same allocated
> memory. As we'll allocate this memory only once, this memory will stay
> allocated.
BHI buffer is not needed anymore after initial firmware loaded. So IMO we can not keep it
just for the purpose of avoiding OOM in the future.
next prev parent reply other threads:[~2025-07-16 3:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250715132509.2643305-1-usama.anjum@collabora.com>
2025-07-15 13:25 ` [PATCH v2 1/3] bus: mhi: host: keep bhi buffer through suspend cycle Muhammad Usama Anjum
2025-07-16 3:41 ` Baochen Qiang [this message]
2025-07-16 9:34 ` Greg Kroah-Hartman
2025-07-17 10:00 ` Muhammad Usama Anjum
2025-07-17 11:50 ` Greg Kroah-Hartman
2025-07-15 13:25 ` [PATCH v2 2/3] bus: mhi: host: keep bhie " Muhammad Usama Anjum
2025-07-16 9:35 ` Greg Kroah-Hartman
2025-07-15 13:25 ` [PATCH v2 3/3] bus: mhi: keep device context through suspend cycles Muhammad Usama Anjum
2025-07-16 9:35 ` Greg Kroah-Hartman
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