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From: Joerg Roedel <joro@8bytes.org>
To: Sibi Sankar <sibis@codeaurora.org>
Cc: bjorn.andersson@linaro.org, robh+dt@kernel.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org,
	linux-remoteproc@vger.kernel.org, ohad@wizery.com,
	agross@kernel.org
Subject: Re: [PATCH 0/3] Request direct mapping for modem firmware subdevice
Date: Tue, 10 Mar 2020 12:23:32 +0100	[thread overview]
Message-ID: <20200310112332.GG3794@8bytes.org> (raw)
In-Reply-To: <20200309182255.20142-1-sibis@codeaurora.org>

On Mon, Mar 09, 2020 at 11:52:52PM +0530, Sibi Sankar wrote:
> The Q6 modem sub-system has direct access to DDR through memnoc and
> an indirect access routed through a SMMU which MSS CE (crypto engine
> sub-component of MSS) uses during out of reset sequence. Request direct
> mapping for the modem-firmware subdevice since smmu is not expected
> to provide access control/translation for these SIDs (sandboxing of the
> modem is achieved through XPUs engaged using SMC calls).

So the DMA accesses are initiated by the firmware and need to be direct
mapped? Which memory region do they access?

Regards,

	Joerg


  parent reply	other threads:[~2020-03-10 11:23 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-09 18:22 [PATCH 0/3] Request direct mapping for modem firmware subdevice Sibi Sankar
2020-03-09 18:22 ` [PATCH 1/3] iommu: Export "iommu_request_dm_for_dev" Sibi Sankar
2020-03-09 18:22 ` [PATCH 2/3] dt-bindings: remoteproc: qcom: Add modem-firmware bindings Sibi Sankar
2020-03-09 18:22 ` [PATCH 3/3] remoteproc: qcom_q6v5_mss: Request direct mapping for firmware subdevice Sibi Sankar
2020-03-10 11:23 ` Joerg Roedel [this message]
2020-03-10 14:00   ` [PATCH 0/3] Request direct mapping for modem " Sibi Sankar
2020-03-10 16:23     ` Joerg Roedel
2020-03-10 16:44       ` Robin Murphy
2020-03-12  6:28         ` Sai Prakash Ranjan
2020-03-12 12:05           ` Robin Murphy
2020-03-23  9:43             ` Sai Prakash Ranjan
2020-03-16 15:50 ` Christoph Hellwig
2020-03-16 16:37   ` Sibi Sankar

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