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Message-ID: <28bc5a07-3486-6129-7fc9-d37315e34237@ti.com>
Date: Fri, 8 Feb 2019 10:03:10 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC: Murali Karicheri <m-karicheri2@...com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Jingoo Han <jingoohan1@...il.com>,
Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
<linux-pci@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/9] PCI: keystone: Add separate functions for
configuring MSI and legacy interrupt
Hi,
On 07/02/19 9:14 PM, Lorenzo Pieralisi wrote:
> On Thu, Feb 07, 2019 at 04:39:18PM +0530, Kishon Vijay Abraham I wrote:
>> ks_pcie_get_irq_controller_info() was used to configure both MSI and
>> legacy interrupt. This will prevent MSI or legacy interrupt specific
>> intializations. Add separate functions to configure MSI and legacy
>> interrupts.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>> drivers/pci/controller/dwc/pci-keystone.c | 188 +++++++++++-----------
>> 1 file changed, 96 insertions(+), 92 deletions(-)
>>
>> diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
>> index 4cf9849d5a1d..b1d01751c1af 100644
>> --- a/drivers/pci/controller/dwc/pci-keystone.c
>> +++ b/drivers/pci/controller/dwc/pci-keystone.c
>> @@ -87,11 +87,8 @@ struct keystone_pcie {
>> struct dw_pcie *pci;
>> /* PCI Device ID */
>> u32 device_id;
>> - int num_legacy_host_irqs;
>> - int legacy_host_irqs[PCI_NUM_INTX];
>> struct device_node *legacy_intc_np;
>>
>> - int num_msi_host_irqs;
>> int msi_host_irqs[MAX_MSI_HOST_IRQS];
>> int num_lanes;
>> u32 num_viewport;
>> @@ -201,14 +198,6 @@ static int ks_pcie_msi_host_init(struct pcie_port *pp)
>> return dw_pcie_allocate_domains(pp);
>> }
>>
>> -static void ks_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
>> -{
>> - int i;
>> -
>> - for (i = 0; i < PCI_NUM_INTX; i++)
>> - ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), 0x1);
>> -}
>> -
>> static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie,
>> int offset)
>> {
>> @@ -490,17 +479,6 @@ static int __init ks_pcie_dw_host_init(struct keystone_pcie *ks_pcie)
>>
>> ks_pcie->app = *res;
>>
>> - /* Create legacy IRQ domain */
>> - ks_pcie->legacy_irq_domain =
>> - irq_domain_add_linear(ks_pcie->legacy_intc_np,
>> - PCI_NUM_INTX,
>> - &ks_pcie_legacy_irq_domain_ops,
>> - NULL);
>> - if (!ks_pcie->legacy_irq_domain) {
>> - dev_err(dev, "Failed to add irq domain for legacy irqs\n");
>> - return -EINVAL;
>> - }
>> -
>> return dw_pcie_host_init(pp);
>> }
>>
>> @@ -624,85 +602,117 @@ static void ks_pcie_legacy_irq_handler(struct irq_desc *desc)
>> chained_irq_exit(chip, desc);
>> }
>>
>> -static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie,
>> - char *controller, int *num_irqs)
>> +static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie)
>> {
>> - int temp, max_host_irqs, legacy = 1, *host_irqs;
>> struct device *dev = ks_pcie->pci->dev;
>> - struct device_node *np_pcie = dev->of_node, **np_temp;
>> -
>> - if (!strcmp(controller, "msi-interrupt-controller"))
>> - legacy = 0;
>> -
>> - if (legacy) {
>> - np_temp = &ks_pcie->legacy_intc_np;
>> - max_host_irqs = PCI_NUM_INTX;
>> - host_irqs = &ks_pcie->legacy_host_irqs[0];
>> - } else {
>> - np_temp = &ks_pcie->msi_intc_np;
>> - max_host_irqs = MAX_MSI_HOST_IRQS;
>> - host_irqs = &ks_pcie->msi_host_irqs[0];
>> - }
>> + struct device_node *np = ks_pcie->np;
>> + struct device_node *intc_np;
>> + int irq_count;
>> + int irq;
>> + int ret;
>> + int i;
>
> Nit: all int can be in one line.
Okay.
>
>> - /* interrupt controller is in a child node */
>> - *np_temp = of_get_child_by_name(np_pcie, controller);
>> - if (!(*np_temp)) {
>> - dev_err(dev, "Node for %s is absent\n", controller);
>> - return -EINVAL;
>> - }
>> + if (!IS_ENABLED(CONFIG_PCI_MSI))
>> + return 0;
>>
>> - temp = of_irq_count(*np_temp);
>> - if (!temp) {
>> - dev_err(dev, "No IRQ entries in %s\n", controller);
>> - of_node_put(*np_temp);
>> + intc_np = of_get_child_by_name(np, "msi-interrupt-controller");
>> + if (!intc_np) {
>> + dev_WARN(dev, "msi-interrupt-controller node is absent\n");
>
> I do not think you can justify a backtrace for this error path, so
> convert it to a dev_warn() please.
Sure.
>
>> return -EINVAL;
>> }
>>
>> - if (temp > max_host_irqs)
>> - dev_warn(dev, "Too many %s interrupts defined %u\n",
>> - (legacy ? "legacy" : "MSI"), temp);
>> + irq_count = of_irq_count(intc_np);
>> + if (!irq_count) {
>> + dev_err(dev, "No IRQ entries in msi-interrupt-controller\n");
>> + ret = -EINVAL;
>> + goto err;
>> + }
>>
>> - /*
>> - * support upto max_host_irqs. In dt from index 0 to 3 (legacy) or 0 to
>> - * 7 (MSI)
>> - */
>> - for (temp = 0; temp < max_host_irqs; temp++) {
>> - host_irqs[temp] = irq_of_parse_and_map(*np_temp, temp);
>> - if (!host_irqs[temp])
>> - break;
>> + if (irq_count > MAX_MSI_HOST_IRQS) {
>> + dev_warn(dev, "Too many MSI interrupt lines defined %u\n",
>> + irq_count);
>> + irq_count = MAX_MSI_HOST_IRQS;
>> }
>>
>> - of_node_put(*np_temp);
>> + for (i = 0; i < irq_count; i++) {
>> + irq = irq_of_parse_and_map(intc_np, i);
>> + if (!irq) {
>> + ret = -EINVAL;
>> + goto err;
>> + }
>> + ks_pcie->msi_host_irqs[i] = irq;
>>
>> - if (temp) {
>> - *num_irqs = temp;
>> - return 0;
>> + irq_set_chained_handler_and_data(irq, ks_pcie_msi_irq_handler,
>> + ks_pcie);
>> }
>>
>> - return -EINVAL;
>> + of_node_put(intc_np);
>> + return 0;
>> +
>> +err:
>> + of_node_put(intc_np);
>> + return ret;
>> }
>>
>> -static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie)
>> +static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie)
>> {
>> + struct device *dev = ks_pcie->pci->dev;
>> + struct irq_domain *legacy_irq_domain;
>> + struct device_node *np = ks_pcie->np;
>> + struct device_node *intc_np;
>> + int irq_count;
>> + int irq;
>> + int ret;
>> int i;
>>
>> - /* Legacy IRQ */
>> - for (i = 0; i < ks_pcie->num_legacy_host_irqs; i++) {
>> - irq_set_chained_handler_and_data(ks_pcie->legacy_host_irqs[i],
>> + intc_np = of_get_child_by_name(np, "legacy-interrupt-controller");
>> + if (!intc_np) {
>> + dev_WARN(dev, "legacy-interrupt-controller node is absent\n");
>
> Likewise.
Okay.
Thanks
Kishon
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