From patchwork Tue Oct 1 06:16:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 11167999 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EB55713BD for ; Tue, 1 Oct 2019 06:17:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B634E2190F for ; Tue, 1 Oct 2019 06:17:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="c2jg/pog" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729228AbfJAGRh (ORCPT ); Tue, 1 Oct 2019 02:17:37 -0400 Received: from lelv0142.ext.ti.com ([198.47.23.249]:57552 "EHLO lelv0142.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732672AbfJAGQu (ORCPT ); Tue, 1 Oct 2019 02:16:50 -0400 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id x916GZZR055720; Tue, 1 Oct 2019 01:16:35 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1569910595; bh=kaNJDk8EW5fKmIASzKP5pkmnP4IX1NtWg5lMQ5gsd1M=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=c2jg/pogTnGLiEgwU2FZzyje8wdDZvz0VESJcbnt+ybWKCorgH6VrSiEC2Chu+PDw w+taYJGYm41debQQ71/8Q4rr1MbCu5NBLXusoH7LrOJHVxRpBQWxaT0M0ThQHxRtPK zap/rY9fCUCHUBUwyA5nZwIRlPcq41ki4Eaqq7aM= Received: from DLEE106.ent.ti.com (dlee106.ent.ti.com [157.170.170.36]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x916GZuf115315 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 1 Oct 2019 01:16:35 -0500 Received: from DLEE112.ent.ti.com (157.170.170.23) by DLEE106.ent.ti.com (157.170.170.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Tue, 1 Oct 2019 01:16:34 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE112.ent.ti.com (157.170.170.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Tue, 1 Oct 2019 01:16:24 -0500 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id x916GGX9090310; Tue, 1 Oct 2019 01:16:31 -0500 From: Peter Ujfalusi To: , , , CC: , , , , , , , , , Subject: [PATCH v3 04/14] dmaengine: Add metadata_ops for dma_async_tx_descriptor Date: Tue, 1 Oct 2019 09:16:54 +0300 Message-ID: <20191001061704.2399-5-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191001061704.2399-1-peter.ujfalusi@ti.com> References: <20191001061704.2399-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org The metadata is best described as side band data or parameters traveling alongside the data DMAd by the DMA engine. It is data which is understood by the peripheral and the peripheral driver only, the DMA engine see it only as data block and it is not interpreting it in any way. The metadata can be different per descriptor as it is a parameter for the data being transferred. If the DMA supports per descriptor metadata it can implement the attach, get_ptr/set_len callbacks. Client drivers must only use either attach or get_ptr/set_len to avoid misconfiguration. Client driver can check if a given metadata mode is supported by the channel during probe time with dmaengine_is_metadata_mode_supported(chan, DESC_METADATA_CLIENT); dmaengine_is_metadata_mode_supported(chan, DESC_METADATA_ENGINE); and based on this information can use either mode. Wrappers are also added for the metadata_ops. To be used in DESC_METADATA_CLIENT mode: dmaengine_desc_attach_metadata() To be used in DESC_METADATA_ENGINE mode: dmaengine_desc_get_metadata_ptr() dmaengine_desc_set_metadata_len() Signed-off-by: Peter Ujfalusi Reviewed-by: Tero Kristo --- drivers/dma/dmaengine.c | 73 ++++++++++++++++++++++++++ include/linux/dmaengine.h | 108 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 181 insertions(+) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 03ac4b96117c..6baddf7dcbfd 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -1302,6 +1302,79 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, } EXPORT_SYMBOL(dma_async_tx_descriptor_init); +static inline int desc_check_and_set_metadata_mode( + struct dma_async_tx_descriptor *desc, enum dma_desc_metadata_mode mode) +{ + /* Make sure that the metadata mode is not mixed */ + if (!desc->desc_metadata_mode) { + if (dmaengine_is_metadata_mode_supported(desc->chan, mode)) + desc->desc_metadata_mode = mode; + else + return -ENOTSUPP; + } else if (desc->desc_metadata_mode != mode) { + return -EINVAL; + } + + return 0; +} + +int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc, + void *data, size_t len) +{ + int ret; + + if (!desc) + return -EINVAL; + + ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_CLIENT); + if (ret) + return ret; + + if (!desc->metadata_ops || !desc->metadata_ops->attach) + return -ENOTSUPP; + + return desc->metadata_ops->attach(desc, data, len); +} +EXPORT_SYMBOL_GPL(dmaengine_desc_attach_metadata); + +void *dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor *desc, + size_t *payload_len, size_t *max_len) +{ + int ret; + + if (!desc) + return ERR_PTR(-EINVAL); + + ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_ENGINE); + if (ret) + return ERR_PTR(ret); + + if (!desc->metadata_ops || !desc->metadata_ops->get_ptr) + return ERR_PTR(-ENOTSUPP); + + return desc->metadata_ops->get_ptr(desc, payload_len, max_len); +} +EXPORT_SYMBOL_GPL(dmaengine_desc_get_metadata_ptr); + +int dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor *desc, + size_t payload_len) +{ + int ret; + + if (!desc) + return -EINVAL; + + ret = desc_check_and_set_metadata_mode(desc, DESC_METADATA_ENGINE); + if (ret) + return ret; + + if (!desc->metadata_ops || !desc->metadata_ops->set_len) + return -ENOTSUPP; + + return desc->metadata_ops->set_len(desc, payload_len); +} +EXPORT_SYMBOL_GPL(dmaengine_desc_set_metadata_len); + /* dma_wait_for_async_tx - spin wait for a transaction to complete * @tx: in-flight transaction to wait on */ diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 8fcdee1c0cf9..40d062c3b359 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -219,6 +219,58 @@ typedef struct { DECLARE_BITMAP(bits, DMA_TX_TYPE_END); } dma_cap_mask_t; * @bytes_transferred: byte counter */ +/** + * enum dma_desc_metadata_mode - per descriptor metadata mode types supported + * @DESC_METADATA_CLIENT - the metadata buffer is allocated/provided by the + * client driver and it is attached (via the dmaengine_desc_attach_metadata() + * helper) to the descriptor. + * + * Client drivers interested to use this mode can follow: + * - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM: + * 1. prepare the descriptor (dmaengine_prep_*) + * construct the metadata in the client's buffer + * 2. use dmaengine_desc_attach_metadata() to attach the buffer to the + * descriptor + * 3. submit the transfer + * - DMA_DEV_TO_MEM: + * 1. prepare the descriptor (dmaengine_prep_*) + * 2. use dmaengine_desc_attach_metadata() to attach the buffer to the + * descriptor + * 3. submit the transfer + * 4. when the transfer is completed, the metadata should be available in the + * attached buffer + * + * @DESC_METADATA_ENGINE - the metadata buffer is allocated/managed by the DMA + * driver. The client driver can ask for the pointer, maximum size and the + * currently used size of the metadata and can directly update or read it. + * dmaengine_desc_get_metadata_ptr() and dmaengine_desc_set_metadata_len() is + * provided as helper functions. + * + * Client drivers interested to use this mode can follow: + * - DMA_MEM_TO_DEV / DEV_MEM_TO_MEM: + * 1. prepare the descriptor (dmaengine_prep_*) + * 2. use dmaengine_desc_get_metadata_ptr() to get the pointer to the engine's + * metadata area + * 3. update the metadata at the pointer + * 4. use dmaengine_desc_set_metadata_len() to tell the DMA engine the amount + * of data the client has placed into the metadata buffer + * 5. submit the transfer + * - DMA_DEV_TO_MEM: + * 1. prepare the descriptor (dmaengine_prep_*) + * 2. submit the transfer + * 3. on transfer completion, use dmaengine_desc_get_metadata_ptr() to get the + * pointer to the engine's metadata are + * 4. Read out the metadate from the pointer + * + * Note: the two mode is not compatible and clients must use one mode for a + * descriptor. + */ +enum dma_desc_metadata_mode { + DESC_METADATA_NONE = 0, + DESC_METADATA_CLIENT = BIT(0), + DESC_METADATA_ENGINE = BIT(1), +}; + struct dma_chan_percpu { /* stats */ unsigned long memcpy_count; @@ -475,6 +527,18 @@ struct dmaengine_unmap_data { dma_addr_t addr[0]; }; +struct dma_async_tx_descriptor; + +struct dma_descriptor_metadata_ops { + int (*attach)(struct dma_async_tx_descriptor *desc, void *data, + size_t len); + + void *(*get_ptr)(struct dma_async_tx_descriptor *desc, + size_t *payload_len, size_t *max_len); + int (*set_len)(struct dma_async_tx_descriptor *desc, + size_t payload_len); +}; + /** * struct dma_async_tx_descriptor - async transaction descriptor * ---dma generic offload fields--- @@ -488,6 +552,11 @@ struct dmaengine_unmap_data { * descriptor pending. To be pushed on .issue_pending() call * @callback: routine to call after this operation is complete * @callback_param: general parameter to pass to the callback routine + * @desc_metadata_mode: core managed metadata mode to protect mixed use of + * DESC_METADATA_CLIENT or DESC_METADATA_ENGINE. Otherwise + * DESC_METADATA_NONE + * @metadata_ops: DMA driver provided metadata mode ops, need to be set by the + * DMA driver if metadata mode is supported with the descriptor * ---async_tx api specific fields--- * @next: at completion submit this descriptor * @parent: pointer to the next level up in the dependency chain @@ -504,6 +573,8 @@ struct dma_async_tx_descriptor { dma_async_tx_callback_result callback_result; void *callback_param; struct dmaengine_unmap_data *unmap; + enum dma_desc_metadata_mode desc_metadata_mode; + struct dma_descriptor_metadata_ops *metadata_ops; #ifdef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH struct dma_async_tx_descriptor *next; struct dma_async_tx_descriptor *parent; @@ -666,6 +737,7 @@ struct dma_filter { * @global_node: list_head for global dma_device_list * @filter: information for device/slave to filter function/param mapping * @cap_mask: one or more dma_capability flags + * @desc_metadata_modes: supported metadata modes by the DMA device * @max_xor: maximum number of xor sources, 0 if no capability * @max_pq: maximum number of PQ sources and PQ-continue capability * @copy_align: alignment shift for memcpy operations @@ -727,6 +799,7 @@ struct dma_device { struct list_head global_node; struct dma_filter filter; dma_cap_mask_t cap_mask; + enum dma_desc_metadata_mode desc_metadata_modes; unsigned short max_xor; unsigned short max_pq; enum dmaengine_alignment copy_align; @@ -902,6 +975,41 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memcpy( len, flags); } +static inline bool dmaengine_is_metadata_mode_supported(struct dma_chan *chan, + enum dma_desc_metadata_mode mode) +{ + if (!chan) + return false; + + return !!(chan->device->desc_metadata_modes & mode); +} + +#ifdef CONFIG_DMA_ENGINE +int dmaengine_desc_attach_metadata(struct dma_async_tx_descriptor *desc, + void *data, size_t len); +void *dmaengine_desc_get_metadata_ptr(struct dma_async_tx_descriptor *desc, + size_t *payload_len, size_t *max_len); +int dmaengine_desc_set_metadata_len(struct dma_async_tx_descriptor *desc, + size_t payload_len); +#else /* CONFIG_DMA_ENGINE */ +static inline int dmaengine_desc_attach_metadata( + struct dma_async_tx_descriptor *desc, void *data, size_t len) +{ + return -EINVAL; +} +static inline void *dmaengine_desc_get_metadata_ptr( + struct dma_async_tx_descriptor *desc, size_t *payload_len, + size_t *max_len) +{ + return NULL; +} +static inline int dmaengine_desc_set_metadata_len( + struct dma_async_tx_descriptor *desc, size_t payload_len) +{ + return -EINVAL; +} +#endif /* CONFIG_DMA_ENGINE */ + /** * dmaengine_terminate_all() - Terminate all active DMA transfers * @chan: The channel for which to terminate the transfers