From: Arnd Bergmann <arnd@arndb.de> To: Sven Peter <sven@svenpeter.dev> Cc: Hector Martin <marcan@marcan.st>, Alyssa Rosenzweig <alyssa@rosenzweig.io>, Rob Herring <robh+dt@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>, Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>, Marc Zyngier <maz@kernel.org>, DTML <devicetree@vger.kernel.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-nvme@lists.infradead.org Subject: Re: [PATCH 4/9] soc: apple: Add SART driver Date: Mon, 21 Mar 2022 18:07:39 +0100 [thread overview] Message-ID: <CAK8P3a19F8K0MvZV_R6HrmmR+WBsDge+u6U3iEVEjZ74i6+nEg@mail.gmail.com> (raw) In-Reply-To: <20220321165049.35985-5-sven@svenpeter.dev> On Mon, Mar 21, 2022 at 5:50 PM Sven Peter <sven@svenpeter.dev> wrote: > > The NVMe co-processor on the Apple M1 uses a DMA address filter called > SART for some DMA transactions. This adds a simple driver used to > configure the memory regions from which DMA transactions are allowed. > > Co-developed-by: Hector Martin <marcan@marcan.st> > Signed-off-by: Hector Martin <marcan@marcan.st> > Signed-off-by: Sven Peter <sven@svenpeter.dev> Can you add some explanation about why this uses a custom interface instead of hooking into the dma_map_ops? > +static void sart2_get_entry(struct apple_sart *sart, int index, u8 *flags, > + phys_addr_t *paddr, size_t *size) > +{ > + u32 cfg = readl_relaxed(sart->regs + APPLE_SART2_CONFIG(index)); > + u32 paddr_ = readl_relaxed(sart->regs + APPLE_SART2_PADDR(index)); Why do you use the _relaxed() accessors here and elsewhere in the driver? > +struct apple_sart *apple_sart_get(struct device *dev) > +{ > + struct device_node *sart_node; > + struct platform_device *sart_pdev; > + struct apple_sart *sart; > + > + sart_node = of_parse_phandle(dev->of_node, "apple,sart", 0); > + if (!sart_node) > + return ERR_PTR(ENODEV); The error pointers need to take negative values, like 'ERR_PTR(-ENODEV)', here and everywhere else in the driver. Arnd
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de> To: Sven Peter <sven@svenpeter.dev> Cc: Hector Martin <marcan@marcan.st>, Alyssa Rosenzweig <alyssa@rosenzweig.io>, Rob Herring <robh+dt@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>, Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>, Marc Zyngier <maz@kernel.org>, DTML <devicetree@vger.kernel.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-nvme@lists.infradead.org Subject: Re: [PATCH 4/9] soc: apple: Add SART driver Date: Mon, 21 Mar 2022 18:07:39 +0100 [thread overview] Message-ID: <CAK8P3a19F8K0MvZV_R6HrmmR+WBsDge+u6U3iEVEjZ74i6+nEg@mail.gmail.com> (raw) In-Reply-To: <20220321165049.35985-5-sven@svenpeter.dev> On Mon, Mar 21, 2022 at 5:50 PM Sven Peter <sven@svenpeter.dev> wrote: > > The NVMe co-processor on the Apple M1 uses a DMA address filter called > SART for some DMA transactions. This adds a simple driver used to > configure the memory regions from which DMA transactions are allowed. > > Co-developed-by: Hector Martin <marcan@marcan.st> > Signed-off-by: Hector Martin <marcan@marcan.st> > Signed-off-by: Sven Peter <sven@svenpeter.dev> Can you add some explanation about why this uses a custom interface instead of hooking into the dma_map_ops? > +static void sart2_get_entry(struct apple_sart *sart, int index, u8 *flags, > + phys_addr_t *paddr, size_t *size) > +{ > + u32 cfg = readl_relaxed(sart->regs + APPLE_SART2_CONFIG(index)); > + u32 paddr_ = readl_relaxed(sart->regs + APPLE_SART2_PADDR(index)); Why do you use the _relaxed() accessors here and elsewhere in the driver? > +struct apple_sart *apple_sart_get(struct device *dev) > +{ > + struct device_node *sart_node; > + struct platform_device *sart_pdev; > + struct apple_sart *sart; > + > + sart_node = of_parse_phandle(dev->of_node, "apple,sart", 0); > + if (!sart_node) > + return ERR_PTR(ENODEV); The error pointers need to take negative values, like 'ERR_PTR(-ENODEV)', here and everywhere else in the driver. Arnd _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-03-21 17:08 UTC|newest] Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-03-21 16:50 [PATCH 0/9] Apple M1 (Pro/Max) NVMe driver Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 16:50 ` [PATCH 1/9] dt-bindings: soc: apple: Add Apple SART Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-31 21:23 ` Rob Herring 2022-03-31 21:23 ` Rob Herring 2022-04-02 12:58 ` Sven Peter 2022-04-02 12:58 ` Sven Peter 2022-03-21 16:50 ` [PATCH 2/9] dt-bindings: soc: apple: Add ANS NVMe Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-23 11:14 ` Krzysztof Kozlowski 2022-03-23 11:14 ` Krzysztof Kozlowski 2022-04-02 13:05 ` Sven Peter 2022-04-02 13:05 ` Sven Peter 2022-04-02 16:06 ` Krzysztof Kozlowski 2022-04-02 16:06 ` Krzysztof Kozlowski 2022-03-21 16:50 ` [PATCH 3/9] soc: apple: Always include Makefile Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 16:50 ` [PATCH 4/9] soc: apple: Add SART driver Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 17:07 ` Arnd Bergmann [this message] 2022-03-21 17:07 ` Arnd Bergmann 2022-04-02 12:38 ` Sven Peter 2022-04-02 12:38 ` Sven Peter 2022-04-02 19:07 ` Arnd Bergmann 2022-04-02 19:07 ` Arnd Bergmann 2022-04-04 14:58 ` Rob Herring 2022-04-04 14:58 ` Rob Herring 2022-04-04 15:01 ` Hector Martin 2022-04-04 15:01 ` Hector Martin 2022-04-05 15:37 ` Sven Peter 2022-04-05 15:37 ` Sven Peter 2022-03-21 17:17 ` Alyssa Rosenzweig 2022-03-21 17:17 ` Alyssa Rosenzweig 2022-04-02 12:40 ` Sven Peter 2022-04-02 12:40 ` Sven Peter 2022-03-21 16:50 ` [PATCH 5/9] soc: apple: Add RTKit IPC library Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-22 13:13 ` Arnd Bergmann 2022-03-22 13:13 ` Arnd Bergmann 2022-03-22 17:41 ` Robin Murphy 2022-03-22 17:41 ` Robin Murphy 2022-04-02 12:56 ` Sven Peter 2022-04-02 12:56 ` Sven Peter 2022-04-02 18:30 ` Arnd Bergmann 2022-04-02 18:30 ` Arnd Bergmann 2022-04-03 10:45 ` Sven Peter 2022-04-03 10:45 ` Sven Peter 2022-03-22 17:23 ` Alyssa Rosenzweig 2022-03-22 17:23 ` Alyssa Rosenzweig 2022-04-02 12:50 ` Sven Peter 2022-04-02 12:50 ` Sven Peter 2022-03-23 11:19 ` Krzysztof Kozlowski 2022-03-23 11:19 ` Krzysztof Kozlowski 2022-04-02 13:51 ` Sven Peter 2022-04-02 13:51 ` Sven Peter 2022-04-02 16:08 ` Krzysztof Kozlowski 2022-04-02 16:08 ` Krzysztof Kozlowski 2022-04-04 15:02 ` Rob Herring 2022-04-04 15:02 ` Rob Herring 2022-04-04 15:47 ` Hector Martin 2022-04-04 15:47 ` Hector Martin 2022-03-21 16:50 ` [PATCH 6/9] nvme-apple: Add initial Apple SoC NVMe driver Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 17:01 ` Keith Busch 2022-03-21 17:01 ` Keith Busch 2022-04-02 13:10 ` Sven Peter 2022-04-02 13:10 ` Sven Peter 2022-03-22 13:38 ` Arnd Bergmann 2022-03-22 13:38 ` Arnd Bergmann 2022-04-02 13:34 ` Sven Peter 2022-04-02 13:34 ` Sven Peter 2022-04-02 13:58 ` Janne Grunau 2022-04-02 13:58 ` Janne Grunau 2022-04-02 14:02 ` Sven Peter 2022-04-02 14:02 ` Sven Peter 2022-04-02 21:26 ` Arnd Bergmann 2022-04-02 21:26 ` Arnd Bergmann 2022-03-24 6:16 ` Christoph Hellwig 2022-03-24 6:16 ` Christoph Hellwig 2022-04-02 12:47 ` Sven Peter 2022-04-02 12:47 ` Sven Peter 2022-04-04 15:57 ` Hector Martin 2022-04-04 15:57 ` Hector Martin 2022-04-04 15:59 ` Christoph Hellwig 2022-04-04 15:59 ` Christoph Hellwig 2022-04-04 16:03 ` Sven Peter 2022-04-04 16:03 ` Sven Peter 2022-04-04 16:05 ` hch 2022-04-04 16:05 ` hch 2022-04-04 16:05 ` Hector Martin 2022-04-04 16:05 ` Hector Martin 2022-04-04 18:29 ` Jens Axboe 2022-04-04 18:29 ` Jens Axboe 2022-04-05 6:24 ` Christoph Hellwig 2022-04-05 6:24 ` Christoph Hellwig 2022-03-21 16:50 ` [PATCH 7/9] nvme-apple: Serialize command issue Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-24 6:16 ` Christoph Hellwig 2022-03-24 6:16 ` Christoph Hellwig 2022-04-02 12:42 ` Sven Peter 2022-04-02 12:42 ` Sven Peter 2022-03-21 16:50 ` [PATCH 8/9] nvme-apple: Add support for multiple power domains Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-21 16:50 ` [PATCH 9/9] nvme-apple: Add support for suspend/resume Sven Peter 2022-03-21 16:50 ` Sven Peter 2022-03-24 6:17 ` Christoph Hellwig 2022-03-24 6:17 ` Christoph Hellwig 2022-03-22 17:26 ` [PATCH 0/9] Apple M1 (Pro/Max) NVMe driver Alyssa Rosenzweig 2022-03-22 17:26 ` Alyssa Rosenzweig
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