linux-kernel - Re: [PATCH v2] firmware: qcom: scm: Peripheral Authentication Service

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Date:	Wed, 15 Jul 2015 16:33:23 -0500
From:	Andy Gross <agross@...eaurora.org>
To:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Cc:	Stephen Boyd <sboyd@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Subject: Re: [PATCH v2] firmware: qcom: scm: Peripheral Authentication Service

On Wed, Jul 15, 2015 at 11:58:06AM -0700, Bjorn Andersson wrote:

<snip>

> +int __qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size)
> +{
> +	dma_addr_t mdata_phys;
> +	void *mdata_buf;
> +	__le32 scm_ret;
> +	int ret;
> +	struct pas_init_image_req {
> +		__le32 proc;
> +		__le32 image_addr;
> +	} request;
> +
> +	/*
> +	 * During the scm call memory protection will be enabled for the meta
> +	 * data blob, so make sure it's physically contiguous, 4K aligned and
> +	 * non-cachable to avoid XPU violations.
> +	 */
> +	mdata_buf = dma_alloc_coherent(NULL, size, &mdata_phys, GFP_KERNEL);

It'd be nice to send in the dev so we can attribute the allocation correctly.
For 64 bit, we actually have to do this because NULL is not allowed right now.

> +	if (!mdata_buf) {
> +		pr_err("Allocation of metadata buffer failed.\n");
> +		return -ENOMEM;
> +	}
> +	memcpy(mdata_buf, metadata, size);
> +
> +	request.proc = cpu_to_le32(peripheral);
> +	request.image_addr = cpu_to_le32(mdata_phys);
> +
> +	ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_INIT_IMAGE_CMD,
> +			    &request, sizeof(request),
> +			    &scm_ret, sizeof(scm_ret));
> +
> +	dma_free_coherent(NULL, size, mdata_buf, mdata_phys);
> +
> +	return ret ? : le32_to_cpu(scm_ret);
> +}
> +

Otherwise, looks good.  Let me know if you plan to modify for the device above.
If you want me to do it later, thats fine.  But it means API change.

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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