linux-kernel - Re: [PATCH RESEND v2 06/12] coco: host: arm64: Add RMM device communication helpers

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Message-ID: <20251030100052.00005c65@huawei.com>
Date: Thu, 30 Oct 2025 10:00:52 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Aneesh Kumar K.V <aneesh.kumar@...nel.org>
CC: <linux-coco@...ts.linux.dev>, <kvmarm@...ts.linux.dev>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dan.j.williams@...el.com>, <aik@....com>, <lukas@...ner.de>, Samuel Ortiz
	<sameo@...osinc.com>, Xu Yilun <yilun.xu@...ux.intel.com>, Jason Gunthorpe
	<jgg@...pe.ca>, Suzuki K Poulose <Suzuki.Poulose@....com>, Steven Price
	<steven.price@....com>, Bjorn Helgaas <helgaas@...nel.org>, Catalin Marinas
	<catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>, Will Deacon
	<will@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>
Subject: Re: [PATCH RESEND v2 06/12] coco: host: arm64: Add RMM device
 communication helpers

On Thu, 30 Oct 2025 14:48:20 +0530
Aneesh Kumar K.V <aneesh.kumar@...nel.org> wrote:

> Jonathan Cameron <jonathan.cameron@...wei.com> writes:
> ...
> 
> >> +		/*
> >> +		 * Some device communication error will transition the
> >> +		 * device to error state. Report that.
> >> +		 */
> >> +		if (type == PDEV_COMMUNICATE)
> >> +			ret = rmi_pdev_get_state(virt_to_phys(pf0_dsc->rmm_pdev),
> >> +						 (enum rmi_pdev_state *)&state);
> >> +		if (ret)
> >> +			state = error_state;  
> > Whilst not strictly needed I'd do this as:
> >
> > 		if (type == PDEV_COMMUNICATE) {
> > 			ret = rmi_pdev_get_state(virt_to_phys(pf0_dsc->rmm_pdev),
> > 						 (enum rmi_pdev_state *)&state);
> > 			if (ret)
> > 				state = error_state;
> > 		}
> >
> > Just to make it clear that reg check is just on the output of the call above.
> > If we didn't make that call it is definitely zero but nice not to have
> > to reason about it.
> >  
> 
> Some of this is because follow up patch adds more details there. In this case.
> 
> 		/*
> 		 * Some device communication error will transition the
> 		 * device to error state. Report that.
> 		 */
> 		if (type == PDEV_COMMUNICATE)
> 			ret = rmi_pdev_get_state(virt_to_phys(pf0_dsc->rmm_pdev),
> 						 (enum rmi_pdev_state *)&state);
> 		else
> 			ret = rmi_vdev_get_state(virt_to_phys(host_tdi->rmm_vdev),
> 						 (enum rmi_vdev_state *)&state);
> 		if (ret)
> 			state = error_state;
> 
Ah fair enough I missed that.

J
> 
> 
> >  
> >> +	}
> >> +
> >> +	if (state == error_state)
> >> +		pci_err(tsm->pdev, "device communication error\n");
> >> +
> >> +	return state;
> >> +}
> >> +  
> 
> -aneesh