linux-kernel - [RFC 0/2] ath10k:set tx credit to one and delay the unmaping

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Message-Id: <20220121064427.32059-1-quic_youghand@quicinc.com>
Date:   Fri, 21 Jan 2022 12:14:25 +0530
From:   Youghandhar Chintala <quic_youghand@...cinc.com>
To:     ath10k@...ts.infradead.org
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        quic_pillair@...cinc.com, dianders@...omium.org,
        kuabhs@...omium.org, briannorris@...omium.org,
        Youghandhar Chintala <quic_youghand@...cinc.com>
Subject: [RFC 0/2] ath10k:set tx credit to one and delay the unmaping 

Currently for WCN3990, the host driver can send two wmi commands at once, 
now it is limiting to one because if HOST wants to initiate 2 DMA transfers,
it is possible when copy complete interrupt for first DMA reaches HOST,  
CE has already updated SRRI for both DMA transfers and is in the middle 
of 2nd DMA. HOST uses SRRI to interpret how many DMA’s have been completed 
and tries to unmap/free both the DMA entries, but CE is still in the middle
of 2nd DMA which can cause SMMU issues or corruption.

We are seeing a corner case smmu fault issue where copy engine is still accessing
the memory though host unmaps it hence as work around we are delaying the 
unmapping the memory and tx credit to one.

Youghandhar Chintala (2):
  ath10k: Set tx credit to one for wcn3990 snoc based devices
  ath10k: Delay the unmapping of the buffer

 drivers/net/wireless/ath/ath10k/core.c | 30 ++++++++++++++++++++++++++
 drivers/net/wireless/ath/ath10k/htc.c  | 18 +++++++++++++---
 drivers/net/wireless/ath/ath10k/htc.h  |  1 +
 drivers/net/wireless/ath/ath10k/hw.h   |  6 ++++++
 4 files changed, 52 insertions(+), 3 deletions(-)

-- 
2.29.0