From patchwork Mon Dec 21 12:38:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roja Rani Yarubandi X-Patchwork-Id: 11984569 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 736FBC43381 for ; Mon, 21 Dec 2020 12:40:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F0A5224D3 for ; Mon, 21 Dec 2020 12:40:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726920AbgLUMj5 (ORCPT ); Mon, 21 Dec 2020 07:39:57 -0500 Received: from alexa-out.qualcomm.com ([129.46.98.28]:8429 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726881AbgLUMj5 (ORCPT ); Mon, 21 Dec 2020 07:39:57 -0500 Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 21 Dec 2020 04:38:49 -0800 X-QCInternal: smtphost Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 21 Dec 2020 04:38:47 -0800 X-QCInternal: smtphost Received: from c-rojay-linux.qualcomm.com ([10.206.21.80]) by ironmsg02-blr.qualcomm.com with ESMTP; 21 Dec 2020 18:08:07 +0530 Received: by c-rojay-linux.qualcomm.com (Postfix, from userid 88981) id BD4B52D70; Mon, 21 Dec 2020 18:08:06 +0530 (IST) From: Roja Rani Yarubandi To: wsa@kernel.org Cc: swboyd@chromium.org, dianders@chromium.org, saiprakash.ranjan@codeaurora.org, gregkh@linuxfoundation.org, mka@chromium.org, akashast@codeaurora.org, msavaliy@qti.qualcomm.com, skakit@codeaurora.org, pyarlaga@codeaurora.org, rnayak@codeaurora.org, agross@kernel.org, bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, sumit.semwal@linaro.org, linux-media@vger.kernel.org, Roja Rani Yarubandi Subject: [PATCH V7 1/2] i2c: i2c-qcom-geni: Store DMA mapping data in geni_i2c_dev struct Date: Mon, 21 Dec 2020 18:08:00 +0530 Message-Id: <20201221123801.26643-2-rojay@codeaurora.org> X-Mailer: git-send-email 2.29.0 In-Reply-To: <20201221123801.26643-1-rojay@codeaurora.org> References: <20201221123801.26643-1-rojay@codeaurora.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Store DMA mapping data in geni_i2c_dev struct to enhance DMA mapping data scope. For example during shutdown callback to unmap DMA mapping, this stored DMA mapping data can be used to call geni_se_tx_dma_unprep and geni_se_rx_dma_unprep functions. Add two helper functions geni_i2c_rx_msg_cleanup and geni_i2c_tx_msg_cleanup to unwrap the things after rx/tx FIFO/DMA transfers, so that the same can be used in geni_i2c_stop_xfer() function during shutdown callback. Signed-off-by: Roja Rani Yarubandi Reviewed-by: Akash Asthana --- Changes in V5: - As per Stephen's comments separated this patch from shutdown callback patch, gi2c->cur = NULL is not removed from geni_i2c_abort_xfer(), and made a copy of gi2c->cur and passed to cleanup functions. Changes in V6: - Added spin_lock/unlock in geni_i2c_rx_msg_cleanup() and geni_i2c_tx_msg_cleanup() functions. Changes in V7: - As per Akash's comments analysed the race chances and removed spin lock in cleanup functions. drivers/i2c/busses/i2c-qcom-geni.c | 59 ++++++++++++++++++++++-------- 1 file changed, 43 insertions(+), 16 deletions(-) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 046d241183c5..214b4c913a13 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -86,6 +86,9 @@ struct geni_i2c_dev { u32 clk_freq_out; const struct geni_i2c_clk_fld *clk_fld; int suspended; + void *dma_buf; + size_t xfer_len; + dma_addr_t dma_addr; }; struct geni_i2c_err_log { @@ -348,14 +351,39 @@ static void geni_i2c_tx_fsm_rst(struct geni_i2c_dev *gi2c) dev_err(gi2c->se.dev, "Timeout resetting TX_FSM\n"); } +static void geni_i2c_rx_msg_cleanup(struct geni_i2c_dev *gi2c, + struct i2c_msg *cur) +{ + gi2c->cur_rd = 0; + if (gi2c->dma_buf) { + if (gi2c->err) + geni_i2c_rx_fsm_rst(gi2c); + geni_se_rx_dma_unprep(&gi2c->se, gi2c->dma_addr, gi2c->xfer_len); + i2c_put_dma_safe_msg_buf(gi2c->dma_buf, cur, !gi2c->err); + } +} + +static void geni_i2c_tx_msg_cleanup(struct geni_i2c_dev *gi2c, + struct i2c_msg *cur) +{ + gi2c->cur_wr = 0; + if (gi2c->dma_buf) { + if (gi2c->err) + geni_i2c_tx_fsm_rst(gi2c); + geni_se_tx_dma_unprep(&gi2c->se, gi2c->dma_addr, gi2c->xfer_len); + i2c_put_dma_safe_msg_buf(gi2c->dma_buf, cur, !gi2c->err); + } +} + static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, u32 m_param) { - dma_addr_t rx_dma; + dma_addr_t rx_dma = 0; unsigned long time_left; void *dma_buf; struct geni_se *se = &gi2c->se; size_t len = msg->len; + struct i2c_msg *cur; dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); if (dma_buf) @@ -370,19 +398,18 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, geni_se_select_mode(se, GENI_SE_FIFO); i2c_put_dma_safe_msg_buf(dma_buf, msg, false); dma_buf = NULL; + } else { + gi2c->xfer_len = len; + gi2c->dma_addr = rx_dma; + gi2c->dma_buf = dma_buf; } + cur = gi2c->cur; time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); if (!time_left) geni_i2c_abort_xfer(gi2c); - gi2c->cur_rd = 0; - if (dma_buf) { - if (gi2c->err) - geni_i2c_rx_fsm_rst(gi2c); - geni_se_rx_dma_unprep(se, rx_dma, len); - i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err); - } + geni_i2c_rx_msg_cleanup(gi2c, cur); return gi2c->err; } @@ -390,11 +417,12 @@ static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, u32 m_param) { - dma_addr_t tx_dma; + dma_addr_t tx_dma = 0; unsigned long time_left; void *dma_buf; struct geni_se *se = &gi2c->se; size_t len = msg->len; + struct i2c_msg *cur; dma_buf = i2c_get_dma_safe_msg_buf(msg, 32); if (dma_buf) @@ -409,22 +437,21 @@ static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, geni_se_select_mode(se, GENI_SE_FIFO); i2c_put_dma_safe_msg_buf(dma_buf, msg, false); dma_buf = NULL; + } else { + gi2c->xfer_len = len; + gi2c->dma_addr = tx_dma; + gi2c->dma_buf = dma_buf; } if (!dma_buf) /* Get FIFO IRQ */ writel_relaxed(1, se->base + SE_GENI_TX_WATERMARK_REG); + cur = gi2c->cur; time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT); if (!time_left) geni_i2c_abort_xfer(gi2c); - gi2c->cur_wr = 0; - if (dma_buf) { - if (gi2c->err) - geni_i2c_tx_fsm_rst(gi2c); - geni_se_tx_dma_unprep(se, tx_dma, len); - i2c_put_dma_safe_msg_buf(dma_buf, msg, !gi2c->err); - } + geni_i2c_tx_msg_cleanup(gi2c, cur); return gi2c->err; } From patchwork Mon Dec 21 12:38:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roja Rani Yarubandi X-Patchwork-Id: 11984565 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 403CFC433DB for ; Mon, 21 Dec 2020 12:39:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F41B4223E4 for ; Mon, 21 Dec 2020 12:39:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726486AbgLUMj0 (ORCPT ); Mon, 21 Dec 2020 07:39:26 -0500 Received: from alexa-out.qualcomm.com ([129.46.98.28]:8429 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726026AbgLUMj0 (ORCPT ); Mon, 21 Dec 2020 07:39:26 -0500 Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 21 Dec 2020 04:38:45 -0800 X-QCInternal: smtphost Received: from ironmsg02-blr.qualcomm.com ([10.86.208.131]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/AES256-SHA; 21 Dec 2020 04:38:43 -0800 X-QCInternal: smtphost Received: from c-rojay-linux.qualcomm.com ([10.206.21.80]) by ironmsg02-blr.qualcomm.com with ESMTP; 21 Dec 2020 18:08:09 +0530 Received: by c-rojay-linux.qualcomm.com (Postfix, from userid 88981) id B16231ADD; Mon, 21 Dec 2020 18:08:08 +0530 (IST) From: Roja Rani Yarubandi To: wsa@kernel.org Cc: swboyd@chromium.org, dianders@chromium.org, saiprakash.ranjan@codeaurora.org, gregkh@linuxfoundation.org, mka@chromium.org, akashast@codeaurora.org, msavaliy@qti.qualcomm.com, skakit@codeaurora.org, pyarlaga@codeaurora.org, rnayak@codeaurora.org, agross@kernel.org, bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, sumit.semwal@linaro.org, linux-media@vger.kernel.org, Roja Rani Yarubandi Subject: [PATCH V7 2/2] i2c: i2c-qcom-geni: Add shutdown callback for i2c Date: Mon, 21 Dec 2020 18:08:01 +0530 Message-Id: <20201221123801.26643-3-rojay@codeaurora.org> X-Mailer: git-send-email 2.29.0 In-Reply-To: <20201221123801.26643-1-rojay@codeaurora.org> References: <20201221123801.26643-1-rojay@codeaurora.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org If the hardware is still accessing memory after SMMU translation is disabled (as part of smmu shutdown callback), then the IOVAs (I/O virtual address) which it was using will go on the bus as the physical addresses which will result in unknown crashes like NoC/interconnect errors. So, implement shutdown callback to i2c driver to stop on-going transfer and unmap DMA mappings during system "reboot" or "shutdown". Fixes: 37692de5d523 ("i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller") Signed-off-by: Roja Rani Yarubandi Reviewed-by: Akash Asthana --- Changes in V2: - As per Stephen's comments added seperate function for stop transfer, fixed minor nitpicks. - As per Stephen's comments, changed commit text. Changes in V3: - As per Stephen's comments, squashed patch 1 into patch 2, added Fixes tag. - As per Akash's comments, included FIFO case in stop_xfer, fixed minor nitpicks. Changes in V4: - As per Stephen's comments cleaned up geni_i2c_stop_xfer function, added dma_buf in geni_i2c_dev struct to call i2c_put_dma_safe_msg_buf() from other functions, removed "iova" check in geni_se_rx_dma_unprep() and geni_se_tx_dma_unprep() functions. - Added two helper functions geni_i2c_rx_one_msg_done() and geni_i2c_tx_one_msg_done() to unwrap the things after rx/tx FIFO/DMA transfers, so that the same can be used in geni_i2c_stop_xfer() function during shutdown callback. Updated commit text accordingly. - Checking whether it is tx/rx transfer using I2C_M_RD which is valid for both FIFO and DMA cases, so dropped DMA_RX_ACTIVE and DMA_TX_ACTIVE bit checking Changes in V5: - As per Stephen's comments, added spin_lock_irqsave & spin_unlock_irqsave in geni_i2c_stop_xfer() function. Changes in V6: - As per Stephen's comments, taken care of unsafe lock order in geni_i2c_stop_xfer(). - Moved spin_lock/unlock to geni_i2c_rx_msg_cleanup() and geni_i2c_tx_msg_cleanup() functions. Changes in V7: - No changes drivers/i2c/busses/i2c-qcom-geni.c | 35 ++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/drivers/i2c/busses/i2c-qcom-geni.c b/drivers/i2c/busses/i2c-qcom-geni.c index 214b4c913a13..7903e6145543 100644 --- a/drivers/i2c/busses/i2c-qcom-geni.c +++ b/drivers/i2c/busses/i2c-qcom-geni.c @@ -375,6 +375,33 @@ static void geni_i2c_tx_msg_cleanup(struct geni_i2c_dev *gi2c, } } +static void geni_i2c_stop_xfer(struct geni_i2c_dev *gi2c) +{ + int ret; + u32 geni_status; + struct i2c_msg *cur; + + /* Resume device, as runtime suspend can happen anytime during transfer */ + ret = pm_runtime_get_sync(gi2c->se.dev); + if (ret < 0) { + dev_err(gi2c->se.dev, "Failed to resume device: %d\n", ret); + return; + } + + geni_status = readl_relaxed(gi2c->se.base + SE_GENI_STATUS); + if (!(geni_status & M_GENI_CMD_ACTIVE)) + goto out; + + cur = gi2c->cur; + geni_i2c_abort_xfer(gi2c); + if (cur->flags & I2C_M_RD) + geni_i2c_rx_msg_cleanup(gi2c, cur); + else + geni_i2c_tx_msg_cleanup(gi2c, cur); +out: + pm_runtime_put_sync_suspend(gi2c->se.dev); +} + static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg, u32 m_param) { @@ -650,6 +677,13 @@ static int geni_i2c_remove(struct platform_device *pdev) return 0; } +static void geni_i2c_shutdown(struct platform_device *pdev) +{ + struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev); + + geni_i2c_stop_xfer(gi2c); +} + static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev) { int ret; @@ -714,6 +748,7 @@ MODULE_DEVICE_TABLE(of, geni_i2c_dt_match); static struct platform_driver geni_i2c_driver = { .probe = geni_i2c_probe, .remove = geni_i2c_remove, + .shutdown = geni_i2c_shutdown, .driver = { .name = "geni_i2c", .pm = &geni_i2c_pm_ops,