linux-kernel - Re: [PATCH v17 11/35] virt: gunyah: Translate gh_rm_hyp_resource into gunyah

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Date: Mon, 11 Mar 2024 11:09:05 +0530
From: Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
To: Elliot Berman <quic_eberman@...cinc.com>
CC: Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@...aro.org>,
        Murali Nalajal <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Carl van Schaik
	<quic_cvanscha@...cinc.com>,
        Philip Derrin <quic_pderrin@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Jonathan Corbet
	<corbet@....net>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Fuad
 Tabba" <tabba@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Andrew
 Morton" <akpm@...ux-foundation.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v17 11/35] virt: gunyah: Translate gh_rm_hyp_resource
 into gunyah_resource

* Elliot Berman <quic_eberman@...cinc.com> [2024-02-22 15:16:34]:

> When booting a Gunyah virtual machine, the host VM may gain capabilities
> to interact with resources for the guest virtual machine. Examples of
> such resources are vCPUs or message queues. To use those resources, we
> need to translate the RM response into a gunyah_resource structure which
> are useful to Linux drivers. Presently, Linux drivers need only to know
> the type of resource, the capability ID, and an interrupt.
> 
> On ARM64 systems, the interrupt reported by Gunyah is the GIC interrupt
> ID number and always a SPI or extended SPI.
> 
> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>

Minor nit below. LGTM otherwise

Reviewed-by: Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>

> +struct gunyah_resource *
> +gunyah_rm_alloc_resource(struct gunyah_rm *rm,
> +			 struct gunyah_rm_hyp_resource *hyp_resource)
> +{
> +	struct gunyah_resource *ghrsc;
> +	int ret;
> +
> +	ghrsc = kzalloc(sizeof(*ghrsc), GFP_KERNEL);
> +	if (!ghrsc)
> +		return NULL;
> +
> +	ghrsc->type = hyp_resource->type;
> +	ghrsc->capid = le64_to_cpu(hyp_resource->cap_id);
> +	ghrsc->irq = IRQ_NOTCONNECTED;
> +	ghrsc->rm_label = le32_to_cpu(hyp_resource->resource_label);
> +	if (hyp_resource->virq) {
> +		struct irq_fwspec fwspec;
> +
> +
> +		fwspec.fwnode = rm->parent_fwnode;
> +		ret = arch_gunyah_fill_irq_fwspec_params(le32_to_cpu(hyp_resource->virq), &fwspec);
> +		if (ret) {
> +			dev_err(rm->dev,
> +				"Failed to translate interrupt for resource %d label: %d: %d\n",
> +				ghrsc->type, ghrsc->rm_label, ret);

Not bailing on error here appears wrong. Can you check?

> +		}
> +
> +		ret = irq_create_fwspec_mapping(&fwspec);
> +		if (ret < 0) {
> +			dev_err(rm->dev,
> +				"Failed to allocate interrupt for resource %d label: %d: %d\n",
> +				ghrsc->type, ghrsc->rm_label, ret);
> +			kfree(ghrsc);
> +			return NULL;
> +		}
> +		ghrsc->irq = ret;
> +	}
> +
> +	return ghrsc;
> +}