linux-kernel - Re: [PATCH v4 2/3] remoteproc: qcom: pas: make region assign more generic

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Message-ID: <76f18323-a59e-4724-96ec-6306e5dcd2dc@linaro.org>
Date:   Sat, 9 Dec 2023 19:06:12 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mukesh Ojha <quic_mojha@...cinc.com>
Subject: Re: [PATCH v4 2/3] remoteproc: qcom: pas: make region assign more
 generic

On 8.12.2023 16:04, Neil Armstrong wrote:
> The current memory region assign only supports a single
> memory region.
> 
> But new platforms introduces more regions to make the
> memory requirements more flexible for various use cases.
> Those new platforms also shares the memory region between the
> DSP and HLOS.
> 
> To handle this, make the region assign more generic in order
> to support more than a single memory region and also permit
> setting the regions permissions as shared.
> 
> Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
[...]

> +	for (offset = 0; offset < adsp->region_assign_count; ++offset) {
> +		struct reserved_mem *rmem = NULL;
> +
> +		node = of_parse_phandle(adsp->dev->of_node, "memory-region",
> +					adsp->region_assign_idx + offset);
> +		if (node)
> +			rmem = of_reserved_mem_lookup(node);
> +		of_node_put(node);
Shouldn't this only be called when parse_phandle succeeds? (separate
patch with a fix + cc stable if so?)

> +		if (!rmem) {
> +			dev_err(adsp->dev, "unable to resolve shareable memory-region index %d\n",
> +				offset);
> +			return -EINVAL;
> +		}
>  
> -	perm.vmid = QCOM_SCM_VMID_MSS_MSA;
> -	perm.perm = QCOM_SCM_PERM_RW;
> +		if (adsp->region_assign_shared)  {
> +			perm[0].vmid = QCOM_SCM_VMID_HLOS;
> +			perm[0].perm = QCOM_SCM_PERM_RW;
> +			perm[1].vmid = adsp->region_assign_vmid;
> +			perm[1].perm = QCOM_SCM_PERM_RW;
> +			perm_size = 2;
> +		} else {
> +			perm[0].vmid = adsp->region_assign_vmid;
> +			perm[0].perm = QCOM_SCM_PERM_RW;
> +			perm_size = 1;
> +		}
>  
> -	adsp->region_assign_phys = rmem->base;
> -	adsp->region_assign_size = rmem->size;
> -	adsp->region_assign_perms = BIT(QCOM_SCM_VMID_HLOS);
> +		adsp->region_assign_phys[offset] = rmem->base;
> +		adsp->region_assign_size[offset] = rmem->size;
> +		adsp->region_assign_perms[offset] = BIT(QCOM_SCM_VMID_HLOS);
>  
> -	ret = qcom_scm_assign_mem(adsp->region_assign_phys,
> -				  adsp->region_assign_size,
> -				  &adsp->region_assign_perms,
I think this should be renamed to region_assign_owner(s)

> -				  &perm, 1);
> -	if (ret < 0) {
> -		dev_err(adsp->dev, "assign memory failed\n");
> -		return ret;
> +		ret = qcom_scm_assign_mem(adsp->region_assign_phys[offset],
> +					  adsp->region_assign_size[offset],
> +					  &adsp->region_assign_perms[offset],
> +					  perm, perm_size);
> +		if (ret < 0) {
> +			dev_err(adsp->dev, "assign memory %d failed\n", offset);
> +			return ret;
> +		}
>  	}
>  
>  	return 0;
> @@ -629,20 +653,23 @@ static int adsp_assign_memory_region(struct qcom_adsp *adsp)
>  static void adsp_unassign_memory_region(struct qcom_adsp *adsp)
>  {
>  	struct qcom_scm_vmperm perm;
> +	int offset;
>  	int ret;
>  
> -	if (!adsp->region_assign_idx)
> +	if (!adsp->region_assign_idx || adsp->region_assign_shared)
So when it's *shared*, we don't want to un-assign it?

Konrad