On Tue, 2019-01-22 at 17:37 +0800, Jianjun Wang wrote: > There is no need to create the inner domain as a parent for MSI domian, > some feature has been implemented by MSI framework. > > Remove the inner domain and its irq chip, it will be more closer to > hardware implementation. > Hi, jianjun, I'm not quite familiar with the irq_chip framework, It was under Marc's great help with the first version of irq_chip solution code. I would like you to add him for the review.
Thanks. > Signed-off-by: Jianjun Wang <[email protected]> > --- > drivers/pci/controller/pcie-mediatek.c | 86 +++++++++++--------------- > 1 file changed, 37 insertions(+), 49 deletions(-) > > diff --git a/drivers/pci/controller/pcie-mediatek.c > b/drivers/pci/controller/pcie-mediatek.c > index 8d05df56158b..f996a9a6331f 100644 > --- a/drivers/pci/controller/pcie-mediatek.c > +++ b/drivers/pci/controller/pcie-mediatek.c > @@ -169,7 +169,6 @@ struct mtk_pcie_soc { > * @slot: port slot > * @irq: GIC irq > * @irq_domain: legacy INTx IRQ domain > - * @inner_domain: inner IRQ domain > * @msi_domain: MSI IRQ domain > * @lock: protect the msi_irq_in_use bitmap > * @msi_irq_in_use: bit map for assigned MSI IRQ > @@ -190,7 +189,6 @@ struct mtk_pcie_port { > u32 slot; > int irq; > struct irq_domain *irq_domain; > - struct irq_domain *inner_domain; > struct irq_domain *msi_domain; > struct mutex lock; > DECLARE_BITMAP(msi_irq_in_use, MTK_MSI_IRQS_NUM); > @@ -418,22 +416,15 @@ static void mtk_msi_ack_irq(struct irq_data *data) > u32 hwirq = data->hwirq; > > writel(1 << hwirq, port->base + PCIE_IMSI_STATUS); > + writel(MSI_STATUS, port->base + PCIE_INT_STATUS); > } > > -static struct irq_chip mtk_msi_bottom_irq_chip = { > - .name = "MTK MSI", > - .irq_compose_msi_msg = mtk_compose_msi_msg, > - .irq_set_affinity = mtk_msi_set_affinity, > - .irq_ack = mtk_msi_ack_irq, > -}; > - > -static int mtk_pcie_irq_domain_alloc(struct irq_domain *domain, unsigned int > virq, > - unsigned int nr_irqs, void *args) > +static irq_hw_number_t mtk_pcie_msi_get_hwirq(struct msi_domain_info *info, > + msi_alloc_info_t *arg) > { > - struct mtk_pcie_port *port = domain->host_data; > - unsigned long bit; > + struct mtk_pcie_port *port = info->chip_data; > + irq_hw_number_t bit; > > - WARN_ON(nr_irqs != 1); > mutex_lock(&port->lock); > > bit = find_first_zero_bit(port->msi_irq_in_use, MTK_MSI_IRQS_NUM); > @@ -446,18 +437,14 @@ static int mtk_pcie_irq_domain_alloc(struct irq_domain > *domain, unsigned int vir > > mutex_unlock(&port->lock); > > - irq_domain_set_info(domain, virq, bit, &mtk_msi_bottom_irq_chip, > - domain->host_data, handle_edge_irq, > - NULL, NULL); > - > - return 0; > + return bit; > } > > -static void mtk_pcie_irq_domain_free(struct irq_domain *domain, > - unsigned int virq, unsigned int nr_irqs) > +static void mtk_pcie_msi_free(struct irq_domain *domain, > + struct msi_domain_info *info, unsigned int virq) > { > struct irq_data *d = irq_domain_get_irq_data(domain, virq); > - struct mtk_pcie_port *port = irq_data_get_irq_chip_data(d); > + struct mtk_pcie_port *port = info->chip_data; > > mutex_lock(&port->lock); > > @@ -468,46 +455,50 @@ static void mtk_pcie_irq_domain_free(struct irq_domain > *domain, > __clear_bit(d->hwirq, port->msi_irq_in_use); > > mutex_unlock(&port->lock); > - > - irq_domain_free_irqs_parent(domain, virq, nr_irqs); > } > > -static const struct irq_domain_ops msi_domain_ops = { > - .alloc = mtk_pcie_irq_domain_alloc, > - .free = mtk_pcie_irq_domain_free, > +static struct msi_domain_ops mtk_msi_domain_ops = { > + .get_hwirq = mtk_pcie_msi_get_hwirq, > + .msi_free = mtk_pcie_msi_free, > }; > > static struct irq_chip mtk_msi_irq_chip = { > - .name = "MTK PCIe MSI", > - .irq_ack = irq_chip_ack_parent, > - .irq_mask = pci_msi_mask_irq, > - .irq_unmask = pci_msi_unmask_irq, > + .name = "MTK PCIe", > + .irq_compose_msi_msg = mtk_compose_msi_msg, > + .irq_write_msi_msg = pci_msi_domain_write_msg, > + .irq_set_affinity = mtk_msi_set_affinity, > + .irq_ack = mtk_msi_ack_irq, > + .irq_mask = pci_msi_mask_irq, > + .irq_unmask = pci_msi_unmask_irq, > }; > > static struct msi_domain_info mtk_msi_domain_info = { > - .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | > - MSI_FLAG_PCI_MSIX), > - .chip = &mtk_msi_irq_chip, > + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | > + MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_PCI_MSIX), > + .ops = &mtk_msi_domain_ops, > + .chip = &mtk_msi_irq_chip, > + .handler = handle_edge_irq, > + .handler_name = "MSI", > }; > > static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port) > { > - struct fwnode_handle *fwnode = > of_node_to_fwnode(port->pcie->dev->of_node); > + struct device *dev = port->pcie->dev; > + struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node); > + struct msi_domain_info *info; > > mutex_init(&port->lock); > > - port->inner_domain = irq_domain_create_linear(fwnode, MTK_MSI_IRQS_NUM, > - &msi_domain_ops, port); > - if (!port->inner_domain) { > - dev_err(port->pcie->dev, "failed to create IRQ domain\n"); > + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); > + if (!info) > return -ENOMEM; > - } > > - port->msi_domain = pci_msi_create_irq_domain(fwnode, > &mtk_msi_domain_info, > - port->inner_domain); > + memcpy(info, &mtk_msi_domain_info, sizeof(*info)); > + info->chip_data = port; > + I'm not really like this memcpy of msi_domain_info, but I do not have a better idea to prevent the mixed of mtk_pcie_port data. > + port->msi_domain = pci_msi_create_irq_domain(fwnode, info, NULL); > if (!port->msi_domain) { > - dev_err(port->pcie->dev, "failed to create MSI domain\n"); > - irq_domain_remove(port->inner_domain); > + dev_err(dev, "failed to create MSI domain\n"); > return -ENOMEM; > } > > @@ -541,8 +532,6 @@ static void mtk_pcie_irq_teardown(struct mtk_pcie *pcie) > if (IS_ENABLED(CONFIG_PCI_MSI)) { > if (port->msi_domain) > irq_domain_remove(port->msi_domain); > - if (port->inner_domain) > - irq_domain_remove(port->inner_domain); > } > > irq_dispose_mapping(port->irq); > @@ -619,12 +608,11 @@ static void mtk_pcie_intr_handler(struct irq_desc *desc) > > while ((imsi_status = readl(port->base + > PCIE_IMSI_STATUS))) { > for_each_set_bit(bit, &imsi_status, > MTK_MSI_IRQS_NUM) { > - virq = > irq_find_mapping(port->inner_domain, bit); > + virq = irq_find_mapping( > + port->msi_domain, bit); > generic_handle_irq(virq); > } > } > - /* Clear MSI interrupt status */ > - writel(MSI_STATUS, port->base + PCIE_INT_STATUS); > } why change this irq status clear flow? > } >
