Commit db0a347c authored by wanghaibin's avatar wanghaibin Committed by Dongxu Sun
Browse files

irqchip/gic-v3-its: Add virt platform devices MSI support 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8K8HP


CVE: NA

--------------------------------

Implement the virtual platform device MSI with the GICv3 ITS.
Compared with phycial platform device msi, msi_prepare implementation
need consider the devid alloc.

Signed-off-by: default avatarwanghaibin <wanghaibin.wang@huawei.com>
Signed-off-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarKunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: default avatarDongxu Sun <sundongxu3@huawei.com>
parent cba99807

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

+36 −3
Original line number Diff line number Diff line
@@ -10,6 +10,17 @@ 
#include <linux/of.h>

#include <linux/of_irq.h>



static struct irq_domain *vp_irq_domain;



struct irq_domain *vp_get_irq_domain(void)

{

	if (!vp_irq_domain)

		pr_err("virtual platform irqdomain hasn't be initialized!\n");



	return vp_irq_domain;

}

EXPORT_SYMBOL_GPL(vp_get_irq_domain);



static struct irq_chip its_pmsi_irq_chip = {

	.name			= "ITS-pMSI",

};
@@ -43,6 +54,8 @@ int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id) 
	return -1;

}



extern bool rsv_devid_pool_cap;



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

			    int nvec, msi_alloc_info_t *info)

{
@@ -52,6 +65,17 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, 


	msi_info = msi_get_domain_info(domain->parent);



	if (rsv_devid_pool_cap && !dev->of_node && !dev->fwnode) {

		WARN_ON_ONCE(domain != vp_irq_domain);

		/*

		 * virtual platform device doesn't have a DeviceID which

		 * will be allocated with core ITS's help.

		 */

		info->scratchpad[0].ul = -1;



		goto vdev_pmsi_prepare;

	}



	if (dev->of_node)

		ret = of_pmsi_get_dev_id(domain, dev, &dev_id);

	else
@@ -62,8 +86,10 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, 
	/* ITS specific DeviceID, as the core ITS ignores dev. */

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



vdev_pmsi_prepare:

	/* Allocate at least 32 MSIs, and always as a power of 2 */

	nvec = max_t(int, 32, roundup_pow_of_two(nvec));



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

					  dev, nvec, info);

}
@@ -86,7 +112,7 @@ static const struct of_device_id its_device_id[] = { 
static int __init its_pmsi_init_one(struct fwnode_handle *fwnode,

				const char *name)

{

	struct irq_domain *parent;

	struct irq_domain *pmsi_irqdomain, *parent;



	parent = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_NEXUS);

	if (!parent || !msi_get_domain_info(parent)) {
@@ -94,13 +120,20 @@ static int __init its_pmsi_init_one(struct fwnode_handle *fwnode, 
		return -ENXIO;

	}



	if (!platform_msi_create_irq_domain(fwnode, &its_pmsi_domain_info,

					    parent)) {

	pmsi_irqdomain = platform_msi_create_irq_domain(fwnode,

							&its_pmsi_domain_info,

							parent);

	if (!pmsi_irqdomain) {

		pr_err("%s: unable to create platform domain\n", name);

		return -ENXIO;

	}



	pr_info("Platform MSI: %s domain created\n", name);



	/* Should we take other irqdomains into account? */

	if (!vp_irq_domain)

		vp_irq_domain = pmsi_irqdomain;



	return 0;

}

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

+1 −1
Original line number Diff line number Diff line
@@ -69,7 +69,7 @@ static LIST_HEAD(rsv_devid_pools); 
static DEFINE_RAW_SPINLOCK(rsv_devid_pools_lock);



/* Do we have usable rsv_devid_pool? Initialized to be true. */

static bool rsv_devid_pool_cap = true;

bool rsv_devid_pool_cap = true;

static u8 rsv_buses_start, rsv_buses_count;



static int __init rsv_buses_start_cfg(char *buf)

include/linux/msi.h

+2 −0
Original line number Diff line number Diff line
@@ -431,6 +431,8 @@ int pci_msi_domain_check_cap(struct irq_domain *domain, 
u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);

struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev);

bool pci_dev_has_special_msi_domain(struct pci_dev *pdev);



struct irq_domain *vp_get_irq_domain(void);

#else

static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)

{