From patchwork Mon Nov 23 11:19:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaskara Budiredla X-Patchwork-Id: 330886 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, 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 5FF94C2D0E4 for ; Mon, 23 Nov 2020 11:21:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2AB520674 for ; Mon, 23 Nov 2020 11:21:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=marvell.com header.i=@marvell.com header.b="VZOzu6BB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728914AbgKWLTo (ORCPT ); Mon, 23 Nov 2020 06:19:44 -0500 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174]:25650 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728889AbgKWLTn (ORCPT ); Mon, 23 Nov 2020 06:19:43 -0500 Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 0ANBFVxB013223; Mon, 23 Nov 2020 03:19:41 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=pfpt0220; bh=3TXqj1IKWDJvWf7QNtGMDFnQ22mG8KVQZxTTv7BIfm4=; b=VZOzu6BB7aXCNXdBRvvQf7LsWcYMHAWQ7fYCrQMNGqgfE/JdVVFL7++dtXLHKvj4DE1h aO8LQAPy40hMPFIF3Whx+WI60QSe19vc1zpLxscsTi1pe3fsvyXgYrN7QVTkLyHRDhjq RBbTTxgj/bBxUIGe4NcT/pPSp8EEnW7tS1+EmPkVsvosLm9/QwDVVnfxDtgFniEGDDmP ZA4WVEDsDRTrrKwASAG0SnV96S5pOfSpyvdNGvOOhkrK09Hjd/Gt1Yx7mUYjw7eNTDga lrhXocNi2GdCR/TH2ty4+x7Y+2AyDEnxBAeIGfcPirT5WKOf3lPqVqiThBCrwtVNbfYK 4w== Received: from sc-exch01.marvell.com ([199.233.58.181]) by mx0a-0016f401.pphosted.com with ESMTP id 34y14u5g30-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Mon, 23 Nov 2020 03:19:40 -0800 Received: from DC5-EXCH01.marvell.com (10.69.176.38) by SC-EXCH01.marvell.com (10.93.176.81) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 23 Nov 2020 03:19:39 -0800 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Mon, 23 Nov 2020 03:19:40 -0800 Received: from hyd1soter3.caveonetworks.com (unknown [10.29.37.12]) by maili.marvell.com (Postfix) with ESMTP id 09EA33F703F; Mon, 23 Nov 2020 03:19:36 -0800 (PST) From: Bhaskara Budiredla To: , , , , CC: , , outgoing2/0000-cover-letter.patch@mx0a-0016f401.pphosted.com, Bhaskara Budiredla Subject: [PATCH v2 2/2] mmc: cavium: Add MMC polling method to support kmsg panic/oops write Date: Mon, 23 Nov 2020 16:49:25 +0530 Message-ID: <20201123111925.28999-2-bbudiredla@marvell.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201123111925.28999-1-bbudiredla@marvell.com> References: <20201123111925.28999-1-bbudiredla@marvell.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312, 18.0.737 definitions=2020-11-23_06:2020-11-23,2020-11-23 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org To enable the writing of panic and oops logs, a cavium specific MMC polling method is defined and thereby ensure the functioning of mmcpstore. Signed-off-by: Bhaskara Budiredla --- drivers/mmc/host/cavium-thunderx.c | 10 +++++ drivers/mmc/host/cavium.c | 67 ++++++++++++++++++++++++++++++ drivers/mmc/host/cavium.h | 3 ++ 3 files changed, 80 insertions(+) diff --git a/drivers/mmc/host/cavium-thunderx.c b/drivers/mmc/host/cavium-thunderx.c index 76013bbbcff3..83f25dd6820a 100644 --- a/drivers/mmc/host/cavium-thunderx.c +++ b/drivers/mmc/host/cavium-thunderx.c @@ -19,12 +19,22 @@ static void thunder_mmc_acquire_bus(struct cvm_mmc_host *host) { +#if IS_ENABLED(CONFIG_MMC_PSTORE) + if (!host->pstore) + down(&host->mmc_serializer); +#else down(&host->mmc_serializer); +#endif } static void thunder_mmc_release_bus(struct cvm_mmc_host *host) { +#if IS_ENABLED(CONFIG_MMC_PSTORE) + if (!host->pstore) + up(&host->mmc_serializer); +#else up(&host->mmc_serializer); +#endif } static void thunder_mmc_int_enable(struct cvm_mmc_host *host, u64 val) diff --git a/drivers/mmc/host/cavium.c b/drivers/mmc/host/cavium.c index c5da3aaee334..708bec9d0345 100644 --- a/drivers/mmc/host/cavium.c +++ b/drivers/mmc/host/cavium.c @@ -510,6 +510,66 @@ irqreturn_t cvm_mmc_interrupt(int irq, void *dev_id) return IRQ_RETVAL(emm_int != 0); } +#if IS_ENABLED(CONFIG_MMC_PSTORE) +static int cvm_req_completion_poll(struct mmc_host *host, unsigned long msecs) +{ + struct cvm_mmc_slot *slot = mmc_priv(host); + struct cvm_mmc_host *cvm_host = slot->host; + u64 emm_int; + + while (msecs) { + emm_int = readq(cvm_host->base + MIO_EMM_INT(cvm_host)); + + if (emm_int & MIO_EMM_INT_DMA_DONE) + return 0; + else if (emm_int & MIO_EMM_INT_DMA_ERR) + return -EIO; + mdelay(1); + msecs--; + } + + return -ETIMEDOUT; +} + +static void cvm_req_cleanup_pending(struct mmc_host *host) +{ + struct cvm_mmc_slot *slot = mmc_priv(host); + struct cvm_mmc_host *cvm_host = slot->host; + u64 fifo_cfg; + u64 dma_cfg; + u64 emm_int; + + cvm_host->pstore = 1; + + /* Clear pending DMA FIFO queue */ + fifo_cfg = readq(cvm_host->dma_base + MIO_EMM_DMA_FIFO_CFG(cvm_host)); + if (FIELD_GET(MIO_EMM_DMA_FIFO_CFG_COUNT, fifo_cfg)) + writeq(MIO_EMM_DMA_FIFO_CFG_CLR, + cvm_host->dma_base + MIO_EMM_DMA_FIFO_CFG(cvm_host)); + + /* Clear ongoing DMA, if there is any */ + dma_cfg = readq(cvm_host->dma_base + MIO_EMM_DMA_CFG(cvm_host)); + if (dma_cfg & MIO_EMM_DMA_CFG_EN) { + dma_cfg |= MIO_EMM_DMA_CFG_CLR; + writeq(dma_cfg, cvm_host->dma_base + + MIO_EMM_DMA_CFG(cvm_host)); + do { + dma_cfg = readq(cvm_host->dma_base + + MIO_EMM_DMA_CFG(cvm_host)); + } while (dma_cfg & MIO_EMM_DMA_CFG_EN); + } + + /* Clear pending DMA interrupts */ + emm_int = readq(cvm_host->base + MIO_EMM_INT(cvm_host)); + if (emm_int) + writeq(emm_int, cvm_host->base + MIO_EMM_INT(cvm_host)); + + /* Clear prepared and yet to be fired DMA requests */ + cvm_host->current_req = NULL; + cvm_host->dma_active = false; +} +#endif + /* * Program DMA_CFG and if needed DMA_ADR. * Returns 0 on error, DMA address otherwise. @@ -901,6 +961,10 @@ static const struct mmc_host_ops cvm_mmc_ops = { .set_ios = cvm_mmc_set_ios, .get_ro = mmc_gpio_get_ro, .get_cd = mmc_gpio_get_cd, +#if IS_ENABLED(CONFIG_MMC_PSTORE) + .req_cleanup_pending = cvm_req_cleanup_pending, + .req_completion_poll = cvm_req_completion_poll, +#endif }; static void cvm_mmc_set_clock(struct cvm_mmc_slot *slot, unsigned int clock) @@ -1058,6 +1122,9 @@ int cvm_mmc_of_slot_probe(struct device *dev, struct cvm_mmc_host *host) slot->bus_id = id; slot->cached_rca = 1; +#if IS_ENABLED(CONFIG_MMC_PSTORE) + host->pstore = 0; +#endif host->acquire_bus(host); host->slot[id] = slot; cvm_mmc_switch_to(slot); diff --git a/drivers/mmc/host/cavium.h b/drivers/mmc/host/cavium.h index f3eea5eaa678..248a5a6e3522 100644 --- a/drivers/mmc/host/cavium.h +++ b/drivers/mmc/host/cavium.h @@ -75,6 +75,9 @@ struct cvm_mmc_host { spinlock_t irq_handler_lock; struct semaphore mmc_serializer; +#if IS_ENABLED(CONFIG_MMC_PSTORE) + bool pstore; +#endif struct gpio_desc *global_pwr_gpiod; atomic_t shared_power_users;