From patchwork Wed Aug 11 10:55:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emmanuel Grumbach X-Patchwork-Id: 495584 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=-16.8 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 F2BF2C4338F for ; Wed, 11 Aug 2021 10:55:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D85E1601FE for ; Wed, 11 Aug 2021 10:55:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231857AbhHKK4L (ORCPT ); Wed, 11 Aug 2021 06:56:11 -0400 Received: from mga17.intel.com ([192.55.52.151]:46893 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231143AbhHKK4L (ORCPT ); Wed, 11 Aug 2021 06:56:11 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10072"; a="195369019" X-IronPort-AV: E=Sophos;i="5.84,311,1620716400"; d="scan'208";a="195369019" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Aug 2021 03:55:47 -0700 X-IronPort-AV: E=Sophos;i="5.84,311,1620716400"; d="scan'208";a="516648132" Received: from kniesyn-mobl1.ger.corp.intel.com (HELO egrumbac-mobl1.lan) ([10.254.155.111]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Aug 2021 03:55:45 -0700 From: Emmanuel Grumbach To: kvalo@codeaurora.org Cc: linux-wireless@vger.kernel.org Subject: [PATCH v6 1/7] mei: bus: add client dma interface Date: Wed, 11 Aug 2021 13:55:35 +0300 Message-Id: <20210811105541.43426-1-emmanuel.grumbach@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Alexander Usyskin Expose the client dma mapping via mei client bus interface. The client dma has to be mapped before the device is enabled, therefore we need to create device linking already during mapping and we need to unmap after the client is disable hence we need to postpone the unlink and flush till unmapping or when destroying the device. Signed-off-by: Alexander Usyskin Co-developed-by: Tomas Winkler Signed-off-by: Tomas Winkler Signed-off-by: Emmanuel Grumbach Acked-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20210420172755.12178-1-emmanuel.grumbach@intel.com --- drivers/misc/mei/bus.c | 67 ++++++++++++++++++++++++++++++++++++-- drivers/misc/mei/client.c | 3 ++ drivers/misc/mei/hw.h | 5 +++ include/linux/mei_cl_bus.h | 3 ++ 4 files changed, 75 insertions(+), 3 deletions(-) diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 935acc6bbf3c..7a325572ad1d 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -643,6 +643,64 @@ static void mei_cl_bus_vtag_free(struct mei_cl_device *cldev) kfree(cl_vtag); } +void *mei_cldev_dma_map(struct mei_cl_device *cldev, u8 buffer_id, size_t size) +{ + struct mei_device *bus; + struct mei_cl *cl; + int ret; + + if (!cldev || !buffer_id || !size) + return ERR_PTR(-EINVAL); + + if (!IS_ALIGNED(size, MEI_FW_PAGE_SIZE)) { + dev_err(&cldev->dev, "Map size should be aligned to %lu\n", + MEI_FW_PAGE_SIZE); + return ERR_PTR(-EINVAL); + } + + cl = cldev->cl; + bus = cldev->bus; + + mutex_lock(&bus->device_lock); + if (cl->state == MEI_FILE_UNINITIALIZED) { + ret = mei_cl_link(cl); + if (ret) + goto out; + /* update pointers */ + cl->cldev = cldev; + } + + ret = mei_cl_dma_alloc_and_map(cl, NULL, buffer_id, size); +out: + mutex_unlock(&bus->device_lock); + if (ret) + return ERR_PTR(ret); + return cl->dma.vaddr; +} +EXPORT_SYMBOL_GPL(mei_cldev_dma_map); + +int mei_cldev_dma_unmap(struct mei_cl_device *cldev) +{ + struct mei_device *bus; + struct mei_cl *cl; + int ret; + + if (!cldev) + return -EINVAL; + + cl = cldev->cl; + bus = cldev->bus; + + mutex_lock(&bus->device_lock); + ret = mei_cl_dma_unmap(cl, NULL); + + mei_cl_flush_queues(cl, NULL); + mei_cl_unlink(cl); + mutex_unlock(&bus->device_lock); + return ret; +} +EXPORT_SYMBOL_GPL(mei_cldev_dma_unmap); + /** * mei_cldev_enable - enable me client device * create connection with me client @@ -753,9 +811,11 @@ int mei_cldev_disable(struct mei_cl_device *cldev) dev_err(bus->dev, "Could not disconnect from the ME client\n"); out: - /* Flush queues and remove any pending read */ - mei_cl_flush_queues(cl, NULL); - mei_cl_unlink(cl); + /* Flush queues and remove any pending read unless we have mapped DMA */ + if (!cl->dma_mapped) { + mei_cl_flush_queues(cl, NULL); + mei_cl_unlink(cl); + } mutex_unlock(&bus->device_lock); return err; @@ -1054,6 +1114,7 @@ static void mei_cl_bus_dev_release(struct device *dev) if (!cldev) return; + mei_cl_flush_queues(cldev->cl, NULL); mei_me_cl_put(cldev->me_cl); mei_dev_bus_put(cldev->bus); mei_cl_unlink(cldev->cl); diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index 96f4e59c32a5..0e90591235a6 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -700,6 +700,9 @@ int mei_cl_unlink(struct mei_cl *cl) cl_dbg(dev, cl, "unlink client"); + if (cl->state == MEI_FILE_UNINITIALIZED) + return 0; + if (dev->open_handle_count > 0) dev->open_handle_count--; diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h index dfd60c916da0..b46077b17114 100644 --- a/drivers/misc/mei/hw.h +++ b/drivers/misc/mei/hw.h @@ -22,6 +22,11 @@ #define MEI_D0I3_TIMEOUT 5 /* D0i3 set/unset max response time */ #define MEI_HBM_TIMEOUT 1 /* 1 second */ +/* + * FW page size for DMA allocations + */ +#define MEI_FW_PAGE_SIZE 4096UL + /* * MEI Version */ diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h index 07f5ef8fc456..8c8d46ba33bf 100644 --- a/include/linux/mei_cl_bus.h +++ b/include/linux/mei_cl_bus.h @@ -116,4 +116,7 @@ int mei_cldev_enable(struct mei_cl_device *cldev); int mei_cldev_disable(struct mei_cl_device *cldev); bool mei_cldev_enabled(struct mei_cl_device *cldev); +void *mei_cldev_dma_map(struct mei_cl_device *cldev, u8 buffer_id, size_t size); +int mei_cldev_dma_unmap(struct mei_cl_device *cldev); + #endif /* _LINUX_MEI_CL_BUS_H */