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From: Arnd Bergmann <arnd@arndb.de>
To: Eddie James <eajames@linux.ibm.com>
Cc: linux-aspeed <linux-aspeed@lists.ozlabs.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	DTML <devicetree@vger.kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Jason Cooper <jason@lakedaemon.net>,
	Marc Zyngier <maz@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Joel Stanley <joel@jms.id.au>, Andrew Jeffery <andrew@aj.id.au>
Subject: Re: [PATCH v6 06/12] soc: aspeed: Add XDMA Engine Driver
Date: Mon, 10 Feb 2020 17:35:19 +0100	[thread overview]
Message-ID: <CAK8P3a3HsdpLz0aDGem1BrQsNo2mEJOnOsLcKFcLjaERx9dhGg@mail.gmail.com> (raw)
In-Reply-To: <1579123790-6894-7-git-send-email-eajames@linux.ibm.com>

On Wed, Jan 15, 2020 at 10:31 PM Eddie James <eajames@linux.ibm.com> wrote:
>
> The XDMA engine embedded in the AST2500 and AST2600 SOCs performs PCI
> DMA operations between the SOC (acting as a BMC) and a host processor
> in a server.
>
> This commit adds a driver to control the XDMA engine and adds functions
> to initialize the hardware and memory and start DMA operations.
>
> Signed-off-by: Eddie James <eajames@linux.ibm.com>

Hi Eddie,

I'm missing the bigger picture in the description here, how does this fit into
the PCIe endpoint framework and the dmaengine subsystem?

Does the AST2500 show up as a PCIe device in the host, or do you just
inject DMAs into the host and hope that bypasses the IOMMU?
If it shows up as an endpoint, how does the endpoint driver link into the
dma driver?

     Arnd

  parent reply	other threads:[~2020-02-10 16:35 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-15 21:29 [PATCH v6 00/12] aspeed: Add SCU interrupt controller and XDMA engine drivers Eddie James
2020-01-15 21:29 ` [PATCH v6 01/12] dt-bindings: interrupt-controller: Add Aspeed SCU interrupt controller Eddie James
2020-01-24 19:11   ` [tip: irq/core] " tip-bot2 for Eddie James
2020-01-15 21:29 ` [PATCH v6 02/12] irqchip: " Eddie James
2020-01-24 19:11   ` [tip: irq/core] " tip-bot2 for Eddie James
2020-01-15 21:29 ` [PATCH v6 03/12] ARM: dts: aspeed: ast2500: Add " Eddie James
2020-01-15 21:29 ` [PATCH v6 04/12] ARM: dts: aspeed: ast2600: Add SCU interrupt controllers Eddie James
2020-01-15 21:29 ` [PATCH v6 05/12] dt-bindings: soc: Add Aspeed XDMA Engine Eddie James
2020-01-17  0:01   ` Andrew Jeffery
2020-01-15 21:29 ` [PATCH v6 06/12] soc: aspeed: Add XDMA Engine Driver Eddie James
2020-01-17  0:07   ` Andrew Jeffery
2020-02-10 16:35   ` Arnd Bergmann [this message]
2020-02-10 17:10     ` Eddie James
2020-03-16  4:49       ` Joel Stanley
2020-02-16 23:56     ` Andrew Jeffery
2020-01-15 21:29 ` [PATCH v6 07/12] soc: aspeed: xdma: Add user interface Eddie James
2020-01-17  0:09   ` Andrew Jeffery
2020-01-15 21:29 ` [PATCH v6 08/12] soc: aspeed: xdma: Add reset ioctl Eddie James
2020-01-15 21:29 ` [PATCH v6 09/12] ARM: dts: aspeed: ast2500: Add XDMA Engine Eddie James
2020-01-15 21:29 ` [PATCH v6 10/12] ARM: dts: aspeed: ast2600: " Eddie James
2020-01-15 21:29 ` [PATCH v6 11/12] ARM: dts: aspeed: witherspoon: Enable " Eddie James
2020-01-17  0:12   ` Andrew Jeffery
2020-01-15 21:29 ` [PATCH v6 12/12] ARM: dts: aspeed: tacoma: Enable XDMA engine Eddie James
2020-01-17  0:13   ` Andrew Jeffery
2020-01-20  8:54 ` [PATCH v6 00/12] aspeed: Add SCU interrupt controller and XDMA engine drivers Marc Zyngier

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