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Commit 54456db9 authored by Marc Zyngier's avatar Marc Zyngier Committed by Thomas Gleixner
Browse files

irqchip/gicv3-its: Make the PCI/MSI code standalone 



We can now lookup the base ITS domain, making it possible to
initialize the PCI/MSI code independently from the main ITS
subsystem.

This allows us to remove all the previously add hooks.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Ma Jun <majun258@huawei.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Duc Dang <dhdang@apm.com>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438091186-10244-15-git-send-email-marc.zyngier@arm.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 841514ab

drivers/irqchip/irq-gic-v3-its-pci-msi.c

+41 −6
Original line number Diff line number Diff line
@@ -20,8 +20,6 @@ 
#include <linux/of_irq.h>

#include <linux/of_pci.h>



#include <linux/irqchip/arm-gic-v3.h>



static void its_mask_msi_irq(struct irq_data *d)

{

	pci_msi_mask_irq(d);
@@ -74,17 +72,24 @@ static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev, 
{

	struct pci_dev *pdev;

	struct its_pci_alias dev_alias;

	struct msi_domain_info *msi_info;



	if (!dev_is_pci(dev))

		return -EINVAL;



	msi_info = msi_get_domain_info(domain->parent);



	pdev = to_pci_dev(dev);

	dev_alias.pdev = pdev;

	dev_alias.count = nvec;



	pci_for_each_dma_alias(pdev, its_get_pci_alias, &dev_alias);



	return its_msi_prepare(domain, dev_alias.dev_id, dev_alias.count, info);

	/* ITS specific DeviceID, as the core ITS ignores dev. */

	info->scratchpad[0].ul = dev_alias.dev_id;



	return msi_info->ops->msi_prepare(domain->parent,

					  dev, dev_alias.count, info);

}



static struct msi_domain_ops its_pci_msi_ops = {
@@ -98,8 +103,38 @@ static struct msi_domain_info its_pci_msi_domain_info = { 
	.chip	= &its_msi_irq_chip,

};



struct irq_domain *its_pci_msi_alloc_domain(struct device_node *np,

					    struct irq_domain *parent)

static struct of_device_id its_device_id[] = {

	{	.compatible	= "arm,gic-v3-its",	},

	{},

};



static int __init its_pci_msi_init(void)

{

	return pci_msi_create_irq_domain(np, &its_pci_msi_domain_info, parent);

	struct device_node *np;

	struct irq_domain *parent;



	for (np = of_find_matching_node(NULL, its_device_id); np;

	     np = of_find_matching_node(np, its_device_id)) {

		if (!of_property_read_bool(np, "msi-controller"))

			continue;



		parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);

		if (!parent || !msi_get_domain_info(parent)) {

			pr_err("%s: unable to locate ITS domain\n",

			       np->full_name);

			continue;

		}



		if (!pci_msi_create_irq_domain(np, &its_pci_msi_domain_info,

					       parent)) {

			pr_err("%s: unable to create PCI domain\n",

			       np->full_name);

			continue;

		}



		pr_info("PCI/MSI: %s domain created\n", np->full_name);

	}



	return 0;

}

early_initcall(its_pci_msi_init);

drivers/irqchip/irq-gic-v3-its.c

+32 −16
Original line number Diff line number Diff line
@@ -59,7 +59,6 @@ struct its_collection { 
struct its_node {

	raw_spinlock_t		lock;

	struct list_head	entry;

	struct irq_domain	*domain;

	void __iomem		*base;

	unsigned long		phys_base;

	struct its_cmd_block	*cmd_base;
@@ -1187,13 +1186,25 @@ static int its_alloc_device_irq(struct its_device *dev, irq_hw_number_t *hwirq) 
	return 0;

}



int its_msi_prepare(struct irq_domain *domain, u32 dev_id,

static int its_msi_prepare(struct irq_domain *domain, struct device *dev,

			   int nvec, msi_alloc_info_t *info)

{

	struct its_node *its;

	struct its_device *its_dev;

	struct msi_domain_info *msi_info;

	u32 dev_id;



	/*

	 * We ignore "dev" entierely, and rely on the dev_id that has

	 * been passed via the scratchpad. This limits this domain's

	 * usefulness to upper layers that definitely know that they

	 * are built on top of the ITS.

	 */

	dev_id = info->scratchpad[0].ul;



	msi_info = msi_get_domain_info(domain);

	its = msi_info->data;



	its = domain->parent->host_data;

	its_dev = its_find_device(its, dev_id);

	if (its_dev) {

		/*
@@ -1215,6 +1226,10 @@ int its_msi_prepare(struct irq_domain *domain, u32 dev_id, 
	return 0;

}



static struct msi_domain_ops its_msi_domain_ops = {

	.msi_prepare	= its_msi_prepare,

};



static int its_irq_gic_domain_alloc(struct irq_domain *domain,

				    unsigned int virq,

				    irq_hw_number_t hwirq)
@@ -1353,7 +1368,7 @@ static int its_probe(struct device_node *node, struct irq_domain *parent) 
	struct resource res;

	struct its_node *its;

	void __iomem *its_base;

	struct irq_domain *inner_domain = NULL;

	struct irq_domain *inner_domain;

	u32 val;

	u64 baser, tmp;

	int err;
@@ -1443,20 +1458,26 @@ static int its_probe(struct device_node *node, struct irq_domain *parent) 
	writel_relaxed(GITS_CTLR_ENABLE, its->base + GITS_CTLR);



	if (of_property_read_bool(node, "msi-controller")) {

		struct msi_domain_info *info;



		info = kzalloc(sizeof(*info), GFP_KERNEL);

		if (!info) {

			err = -ENOMEM;

			goto out_free_tables;

		}



		inner_domain = irq_domain_add_tree(node, &its_domain_ops, its);

		if (!inner_domain) {

			err = -ENOMEM;

			kfree(info);

			goto out_free_tables;

		}



		inner_domain->parent = parent;

		inner_domain->bus_token = DOMAIN_BUS_NEXUS;



		its->domain = its_pci_msi_alloc_domain(node, inner_domain);

		if (!its->domain) {

			err = -ENOMEM;

			goto out_free_domains;

		}

		info->ops = &its_msi_domain_ops;

		info->data = its;

		inner_domain->host_data = info;

	}



	spin_lock(&its_lock);
@@ -1465,11 +1486,6 @@ static int its_probe(struct device_node *node, struct irq_domain *parent) 


	return 0;



out_free_domains:

	if (its->domain)

		irq_domain_remove(its->domain);

	if (inner_domain)

		irq_domain_remove(inner_domain);

out_free_tables:

	its_free_tables(its);

out_free_cmd:

include/linux/irqchip/arm-gic-v3.h

+0 −5
Original line number Diff line number Diff line
@@ -389,11 +389,6 @@ struct irq_domain; 
int its_cpu_init(void);

int its_init(struct device_node *node, struct rdists *rdists,

	     struct irq_domain *domain);

int its_msi_prepare(struct irq_domain *domain, u32 dev_id,

		    int nvec, msi_alloc_info_t *info);



struct irq_domain *its_pci_msi_alloc_domain(struct device_node *node,

					    struct irq_domain *parent);



#endif