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

ANBZ: #9398

commit 4cc685056a0056a0f8bdcfe901000dd4731efc6b openEuler.

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8UROS
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: wanghaibin <wanghaibin.wang@huawei.com>
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>
Signed-off-by: Guanghui Feng <guanghuifeng@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/3463
This commit is contained in:
wanghaibin 2024-01-11 20:43:24 +08:00 committed by 小龙
parent 2040f15d5b
commit 557e32b259
3 changed files with 47 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/irqchip/irq-gic-v3-its-platform-msi.c
View File

@ -10,6 +10,20 @@
#include <linux/of.h>
#include <linux/of_irq.h>
#ifdef CONFIG_VIRT_PLAT_DEV
static struct irq_domain *vp_irq_domain;
extern bool rsv_devid_pool_cap;
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);
#endif
static struct irq_chip its_pmsi_irq_chip = {
.name = "ITS-pMSI",
};
@ -52,6 +66,19 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
msi_info = msi_get_domain_info(domain->parent);
#ifdef CONFIG_VIRT_PLAT_DEV
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;
}
#endif
if (dev->of_node)
ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
else
@ -62,6 +89,9 @@ 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;
#ifdef CONFIG_VIRT_PLAT_DEV
vdev_pmsi_prepare:
#endif
/* 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,
@ -86,7 +116,7 @@ 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 +124,22 @@ 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);
#ifdef CONFIG_VIRT_PLAT_DEV
/* Should we take other irqdomains into account? */
if (!vp_irq_domain)
vp_irq_domain = pmsi_irqdomain;
#endif
return 0;
}

2
drivers/irqchip/irq-gic-v3-its.c
View File

@ -67,7 +67,7 @@ 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)

4
include/linux/msi.h
View File

@ -550,6 +550,10 @@ 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);
#ifdef CONFIG_VIRT_PLAT_DEV
struct irq_domain *vp_get_irq_domain(void);
#endif
#else
static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
{