linux-kernel - Re: [v8,5/7] PCI: mediatek-gen3: Add MSI support

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Date:   Thu, 11 Mar 2021 08:19:18 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Pali Rohár <pali@...nel.org>,
        Jianjun Wang <jianjun.wang@...iatek.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-pci@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Sj Huang <sj.huang@...iatek.com>, youlin.pei@...iatek.com,
        chuanjia.liu@...iatek.com, qizhong.cheng@...iatek.com,
        sin_jieyang@...iatek.com, drinkcat@...omium.org,
        Rex-BC.Chen@...iatek.com, anson.chuang@...iatek.com
Subject: Re: [v8,5/7] PCI: mediatek-gen3: Add MSI support

On 2021-03-11 00:05, Pali Rohár wrote:
> On Wednesday 24 February 2021 14:11:30 Jianjun Wang wrote:
>> +static int mtk_msi_bottom_domain_alloc(struct irq_domain *domain,
>> +				       unsigned int virq, unsigned int nr_irqs,
>> +				       void *arg)
>> +{
>> +	struct mtk_pcie_port *port = domain->host_data;
>> +	struct mtk_msi_set *msi_set;
>> +	int i, hwirq, set_idx;
>> +
>> +	mutex_lock(&port->lock);
>> +
>> +	hwirq = bitmap_find_free_region(port->msi_irq_in_use, 
>> PCIE_MSI_IRQS_NUM,
>> +					order_base_2(nr_irqs));
>> +
>> +	mutex_unlock(&port->lock);
>> +
>> +	if (hwirq < 0)
>> +		return -ENOSPC;
>> +
>> +	set_idx = hwirq / PCIE_MSI_IRQS_PER_SET;
>> +	msi_set = &port->msi_sets[set_idx];
>> +
>> +	for (i = 0; i < nr_irqs; i++)
>> +		irq_domain_set_info(domain, virq + i, hwirq + i,
>> +				    &mtk_msi_bottom_irq_chip, msi_set,
>> +				    handle_edge_irq, NULL, NULL);
>> +
>> +	return 0;
>> +}
>> +
>> +static void mtk_msi_bottom_domain_free(struct irq_domain *domain,
>> +				       unsigned int virq, unsigned int nr_irqs)
>> +{
>> +	struct mtk_pcie_port *port = domain->host_data;
>> +	struct irq_data *data = irq_domain_get_irq_data(domain, virq);
>> +
>> +	mutex_lock(&port->lock);
>> +
>> +	bitmap_clear(port->msi_irq_in_use, data->hwirq, nr_irqs);
> 
> Marc, should not be there bitmap_release_region() with order_base_2()?
> 
> bitmap_release_region(port->msi_irq_in_use, data->hwirq, 
> order_base_2(nr_irqs));
> 
> Because mtk_msi_bottom_domain_alloc() is allocating
> order_base_2(nr_irqs) interrupts, not only nr_irqs.

Indeed, good catch.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...