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Message-ID: <08e71d7d-5da6-4dfe-a504-190e7633df12@collabora.com>
Date: Wed, 9 Apr 2025 17:21:49 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Krishna Chaitanya Chundru <quic_krichai@...cinc.com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
Jeff Hugo <jeff.hugo@....qualcomm.com>,
Youssef Samir <quic_yabdulra@...cinc.com>,
Matthew Leung <quic_mattleun@...cinc.com>, Yan Zhen <yanzhen@...o.com>,
Qiang Yu <quic_qianyu@...cinc.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kunwu Chan <chentao@...inos.cn>
Cc: Carl Vanderlip <quic_carlv@...cinc.com>,
Sumit Garg <sumit.garg@...nel.org>, mhi@...ts.linux.dev,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] bus: mhi: host: don't free bhie tables during power
off
Hi Krishna,
Thank you for reviewing.
On 4/9/25 4:25 PM, Krishna Chaitanya Chundru wrote:
>
>
> On 4/9/2025 1:54 PM, 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. Use the same allocated
>> memory again and again after every resume/hibernation. This patch has
>> been tested with resume and hibernation both.
> How do you handle the mhi un-register case, in that case all the MHI
> memory needs to be freed.
I'm working on fixing it. I'll post a v2.
>>
>> 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>
>> ---
>> drivers/bus/mhi/host/boot.c | 11 +++++++----
>> drivers/bus/mhi/host/init.c | 15 +++------------
>> 2 files changed, 10 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/bus/mhi/host/boot.c b/drivers/bus/mhi/host/boot.c
>> index efa3b6dddf4d2..8b3d2b9d239c3 100644
>> --- a/drivers/bus/mhi/host/boot.c
>> +++ b/drivers/bus/mhi/host/boot.c
>> @@ -323,6 +323,7 @@ void mhi_free_bhie_table(struct mhi_controller
>> *mhi_cntrl,
>> mhi_buf->buf, mhi_buf->dma_addr);
>> kfree(image_info->mhi_buf);
>> + image_info->mhi_buf = NULL;
> image_info is getting freed in the next line. why do we need this?
I'll remove this line.
>
> - Krishna Chaitanya.
>> kfree(image_info);
>> }
>> @@ -584,10 +585,12 @@ void mhi_fw_load_handler(struct mhi_controller
>> *mhi_cntrl)
>> * device transitioning into MHI READY state
>> */
>> if (fw_load_type == MHI_FW_LOAD_FBC) {
>> - ret = mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->fbc_image,
>> fw_sz);
>> - if (ret) {
>> - release_firmware(firmware);
>> - goto error_fw_load;
>> + if (!mhi_cntrl->fbc_image) {
>> + ret = mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl-
>> >fbc_image, fw_sz);
>> + if (ret) {
>> + release_firmware(firmware);
>> + goto error_fw_load;
>> + }
>> }
>> /* Load the firmware into BHIE vec table */
>> diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
>> index 13e7a55f54ff4..3c20e4541357e 100644
>> --- a/drivers/bus/mhi/host/init.c
>> +++ b/drivers/bus/mhi/host/init.c
>> @@ -1173,8 +1173,9 @@ int mhi_prepare_for_power_up(struct
>> mhi_controller *mhi_cntrl)
>> /*
>> * Allocate RDDM table for debugging purpose if specified
>> */
>> - mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->rddm_image,
>> - mhi_cntrl->rddm_size);
>> + if (!mhi_cntrl->rddm_image)
>> + mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->rddm_image,
>> + mhi_cntrl->rddm_size);
>> if (mhi_cntrl->rddm_image) {
>> ret = mhi_rddm_prepare(mhi_cntrl,
>> mhi_cntrl->rddm_image);
>> @@ -1202,16 +1203,6 @@ EXPORT_SYMBOL_GPL(mhi_prepare_for_power_up);
>> void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl)
>> {
>> - if (mhi_cntrl->fbc_image) {
>> - mhi_free_bhie_table(mhi_cntrl, mhi_cntrl->fbc_image);
>> - mhi_cntrl->fbc_image = NULL;
>> - }
>> -
>> - if (mhi_cntrl->rddm_image) {
>> - mhi_free_bhie_table(mhi_cntrl, mhi_cntrl->rddm_image);
>> - mhi_cntrl->rddm_image = NULL;
>> - }
>> -
>> mhi_cntrl->bhi = NULL;
>> mhi_cntrl->bhie = NULL;
>>
--
Regards,
Usama
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