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[81.231.232.130]) by smtp.gmail.com with ESMTPSA id u9sm6188528ljh.20.2020.09.06.23.55.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 06 Sep 2020 23:55:29 -0700 (PDT) Date: Mon, 7 Sep 2020 08:55:28 +0200 From: "Edgar E. Iglesias" To: Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= Subject: Re: [PATCH 03/13] dma: Document address_space_map/address_space_unmap() prototypes Message-ID: <20200907065528.GY2954729@toto> References: <20200904154439.643272-1-philmd@redhat.com> <20200904154439.643272-4-philmd@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200904154439.643272-4-philmd@redhat.com> Received-SPF: pass client-ip=2a00:1450:4864:20::142; envelope-from=edgar.iglesias@gmail.com; helo=mail-lf1-x142.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: 5 X-Spam_score: 0.5 X-Spam_bar: / X-Spam_report: (0.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, FSL_HELO_FAKE=2.633, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , "Michael S. Tsirkin" , Jason Wang , Mark Cave-Ayland , qemu-devel@nongnu.org, Peter Xu , Gerd Hoffmann , qemu-block@nongnu.org, Peter Chubb , Joel Stanley , Marcel Apfelbaum , David Gibson , Laszlo Ersek , Eduardo Habkost , Alistair Francis , Beniamino Galvani , Eric Auger , qemu-arm@nongnu.org, Jan Kiszka , =?iso-8859-1?Q?C=E9dric?= Le Goater , John Snow , Richard Henderson , Andrew Jeffery , Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= , Andrew Baumann , qemu-ppc@nongnu.org, Paolo Bonzini Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: FJgTG0KbFs40 On Fri, Sep 04, 2020 at 05:44:29PM +0200, Philippe Mathieu-Daudé wrote: > Add documentation based on address_space_map / address_space_unmap. > > Signed-off-by: Philippe Mathieu-Daudé > --- > include/sysemu/dma.h | 30 +++++++++++++++++++++++++++++- > 1 file changed, 29 insertions(+), 1 deletion(-) > > diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h > index 80c5bc3e02d..19bc9ad1b69 100644 > --- a/include/sysemu/dma.h > +++ b/include/sysemu/dma.h > @@ -1,7 +1,7 @@ > /* > * DMA helper functions > * > - * Copyright (c) 2009 Red Hat > + * Copyright (c) 2009, 2020 Red Hat > * > * This work is licensed under the terms of the GNU General Public License > * (GNU GPL), version 2 or later. > @@ -125,6 +125,20 @@ static inline int dma_memory_write(AddressSpace *as, dma_addr_t addr, > > int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len); > > +/** > + * address_space_map: Map a physical memory region into a DMA controller > + * virtual address It may be easier to understand this if you change DMA controller virtual address to host virtual address. Either way: Reviewed-by: Edgar E. Iglesias > + * > + * May map a subset of the requested range, given by and returned in @plen. > + * May return %NULL and set *@plen to zero(0), if resources needed to perform > + * the mapping are exhausted. > + * Use only for reads OR writes - not for read-modify-write operations. > + * > + * @as: #AddressSpace to be accessed > + * @addr: address within that address space > + * @len: pointer to length of buffer; updated on return > + * @dir: indicates the transfer direction > + */ > static inline void *dma_memory_map(AddressSpace *as, > dma_addr_t addr, dma_addr_t *len, > DMADirection dir) > @@ -138,6 +152,20 @@ static inline void *dma_memory_map(AddressSpace *as, > return p; > } > > +/** > + * address_space_unmap: Unmaps a memory region previously mapped > + * by dma_memory_map() > + * > + * Will also mark the memory as dirty if @dir == %DMA_DIRECTION_FROM_DEVICE. > + * @access_len gives the amount of memory that was actually read or written > + * by the caller. > + * > + * @as: #AddressSpace used > + * @buffer: host pointer as returned by address_space_map() > + * @len: buffer length as returned by address_space_map() > + * @dir: indicates the transfer direction > + * @access_len: amount of data actually transferred > + */ > static inline void dma_memory_unmap(AddressSpace *as, > void *buffer, dma_addr_t len, > DMADirection dir, dma_addr_t access_len) > -- > 2.26.2 > From mboxrd@z Thu Jan 1 00:00:00 1970 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=-7.3 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, FSL_HELO_FAKE,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 AC63DC433E2 for ; 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[81.231.232.130]) by smtp.gmail.com with ESMTPSA id u9sm6188528ljh.20.2020.09.06.23.55.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 06 Sep 2020 23:55:29 -0700 (PDT) Date: Mon, 7 Sep 2020 08:55:28 +0200 From: "Edgar E. Iglesias" To: Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= Subject: Re: [PATCH 03/13] dma: Document address_space_map/address_space_unmap() prototypes Message-ID: <20200907065528.GY2954729@toto> References: <20200904154439.643272-1-philmd@redhat.com> <20200904154439.643272-4-philmd@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200904154439.643272-4-philmd@redhat.com> Received-SPF: pass client-ip=2a00:1450:4864:20::142; envelope-from=edgar.iglesias@gmail.com; helo=mail-lf1-x142.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: 5 X-Spam_score: 0.5 X-Spam_bar: / X-Spam_report: (0.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, FSL_HELO_FAKE=2.633, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , "Michael S. Tsirkin" , Jason Wang , Mark Cave-Ayland , qemu-devel@nongnu.org, Peter Xu , Gerd Hoffmann , qemu-block@nongnu.org, Peter Chubb , Joel Stanley , David Gibson , Laszlo Ersek , Eduardo Habkost , Alistair Francis , Beniamino Galvani , Eric Auger , qemu-arm@nongnu.org, Jan Kiszka , =?iso-8859-1?Q?C=E9dric?= Le Goater , John Snow , Richard Henderson , Andrew Jeffery , Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= , Andrew Baumann , qemu-ppc@nongnu.org, Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Sep 04, 2020 at 05:44:29PM +0200, Philippe Mathieu-Daudé wrote: > Add documentation based on address_space_map / address_space_unmap. > > Signed-off-by: Philippe Mathieu-Daudé > --- > include/sysemu/dma.h | 30 +++++++++++++++++++++++++++++- > 1 file changed, 29 insertions(+), 1 deletion(-) > > diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h > index 80c5bc3e02d..19bc9ad1b69 100644 > --- a/include/sysemu/dma.h > +++ b/include/sysemu/dma.h > @@ -1,7 +1,7 @@ > /* > * DMA helper functions > * > - * Copyright (c) 2009 Red Hat > + * Copyright (c) 2009, 2020 Red Hat > * > * This work is licensed under the terms of the GNU General Public License > * (GNU GPL), version 2 or later. > @@ -125,6 +125,20 @@ static inline int dma_memory_write(AddressSpace *as, dma_addr_t addr, > > int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len); > > +/** > + * address_space_map: Map a physical memory region into a DMA controller > + * virtual address It may be easier to understand this if you change DMA controller virtual address to host virtual address. Either way: Reviewed-by: Edgar E. Iglesias > + * > + * May map a subset of the requested range, given by and returned in @plen. > + * May return %NULL and set *@plen to zero(0), if resources needed to perform > + * the mapping are exhausted. > + * Use only for reads OR writes - not for read-modify-write operations. > + * > + * @as: #AddressSpace to be accessed > + * @addr: address within that address space > + * @len: pointer to length of buffer; updated on return > + * @dir: indicates the transfer direction > + */ > static inline void *dma_memory_map(AddressSpace *as, > dma_addr_t addr, dma_addr_t *len, > DMADirection dir) > @@ -138,6 +152,20 @@ static inline void *dma_memory_map(AddressSpace *as, > return p; > } > > +/** > + * address_space_unmap: Unmaps a memory region previously mapped > + * by dma_memory_map() > + * > + * Will also mark the memory as dirty if @dir == %DMA_DIRECTION_FROM_DEVICE. > + * @access_len gives the amount of memory that was actually read or written > + * by the caller. > + * > + * @as: #AddressSpace used > + * @buffer: host pointer as returned by address_space_map() > + * @len: buffer length as returned by address_space_map() > + * @dir: indicates the transfer direction > + * @access_len: amount of data actually transferred > + */ > static inline void dma_memory_unmap(AddressSpace *as, > void *buffer, dma_addr_t len, > DMADirection dir, dma_addr_t access_len) > -- > 2.26.2 >