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Message-ID: <e6c53aa3863c3f5b0560ed65282fc5e2@kernel.org>
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...
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