linux-kernel - Re: [PATCH v9 26/27] virt: gunyah: Add irqfd interface

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Date:   Mon, 13 Feb 2023 13:41:03 +0530
From:   Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
To:     Elliot Berman <quic_eberman@...cinc.com>
CC:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Alex Elder <elder@...aro.org>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        "Jonathan Corbet" <corbet@....net>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        "Carl van Schaik" <quic_cvanscha@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Sudeep Holla <sudeep.holla@....com>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 26/27] virt: gunyah: Add irqfd interface

* Elliot Berman <quic_eberman@...cinc.com> [2023-01-20 14:46:25]:

> +static int gunyah_irqfd_populate(struct gunyah_vm_resource_ticket *ticket,
> +				struct gunyah_resource *ghrsc)
> +{
> +	struct gunyah_irqfd *irqfd = container_of(ticket, struct gunyah_irqfd, ticket);
> +	u64 enable_mask = GH_DBL_NONBLOCK;
> +	u64 ack_mask = ~0;
> +	int ret = 0;
> +
> +	irqfd->ghrsc = ghrsc;
> +	if (irqfd->level) {
> +		ret = gh_hypercall_dbl_set_mask(irqfd->ghrsc->capid, enable_mask, ack_mask);

We probably want this mask set for both level and edge interrupts.

> +		if (ret)
> +			pr_warn("irq %d couldn't be set as level triggered. Might cause IRQ storm if asserted\n",
> +				irqfd->f->fn.irqfd.label);
> +	}
> +	kref_get(&irqfd->kref);

Is this kref_get() really needed?

> +
> +	return 0;
> +}
> +