linux-kernel - Re: [PATCH v4] bus: mhi: host: don't free bhie tables during suspend/hibernation

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Message-ID: <608a5b08-a5c7-46a4-adf0-7106e4d82250@oss.qualcomm.com>
Date: Wed, 7 May 2025 07:14:06 -0700
From: Jeff Johnson <jeff.johnson@....qualcomm.com>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Jeff Johnson <jjohnson@...nel.org>,
        Jeff Hugo <jeff.hugo@....qualcomm.com>,
        Youssef Samir <quic_yabdulra@...cinc.com>,
        Matthew Leung <quic_mattleun@...cinc.com>, Yan Zhen <yanzhen@...o.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
        Kunwu Chan <chentao@...inos.cn>,
        Troy Hanson <quic_thanson@...cinc.com>,
        "Dr. David Alan Gilbert" <linux@...blig.org>
Cc: kernel@...labora.com, sebastian.reichel@...labora.com,
        Carl Vanderlip <quic_carlv@...cinc.com>, Alex Elder <elder@...nel.org>,
        mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        ath11k@...ts.infradead.org, ath12k@...ts.infradead.org
Subject: Re: [PATCH v4] bus: mhi: host: don't free bhie tables during
 suspend/hibernation

On 5/6/2025 7:49 AM, Muhammad Usama Anjum wrote:
> Fix dma_direct_alloc() failure at resume time during bhie_table
> allocation because of memory pressure. There is a report where at
> resume time, the memory from the dma doesn't get allocated and MHI
> fails to re-initialize.
> 
> 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.
> 
> Tested-on: WCN6855 WLAN.HSP.1.1-03926.13-QCAHSPSWPL_V2_SILICONZ_CE-2.52297.6
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

Mani, if this looks ok to you I assume you'll take this through your MHI tree.

Acked-by: Jeff Johnson <jeff.johnson@....qualcomm.com>