mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 08:39:31 +07:00
1e6db00048
In order to support non-PCI MSI with the GICv3 ITS, add the minimal required entry points for the MSI domain (an msi_prepare implementation). The rest is only boilerplate code to find the raw ITS domain. Signed-off-by: Marc 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/1438091186-10244-16-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
|
|
* Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/msi.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_irq.h>
|
|
|
|
static struct irq_chip its_pmsi_irq_chip = {
|
|
.name = "ITS-pMSI",
|
|
};
|
|
|
|
static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
|
|
int nvec, msi_alloc_info_t *info)
|
|
{
|
|
struct msi_domain_info *msi_info;
|
|
u32 dev_id;
|
|
int ret;
|
|
|
|
msi_info = msi_get_domain_info(domain->parent);
|
|
|
|
/* Suck the DeviceID out of the msi-parent property */
|
|
ret = of_property_read_u32_index(dev->of_node, "msi-parent",
|
|
1, &dev_id);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* ITS specific DeviceID, as the core ITS ignores dev. */
|
|
info->scratchpad[0].ul = dev_id;
|
|
|
|
return msi_info->ops->msi_prepare(domain->parent,
|
|
dev, nvec, info);
|
|
}
|
|
|
|
static struct msi_domain_ops its_pmsi_ops = {
|
|
.msi_prepare = its_pmsi_prepare,
|
|
};
|
|
|
|
static struct msi_domain_info its_pmsi_domain_info = {
|
|
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
|
|
.ops = &its_pmsi_ops,
|
|
.chip = &its_pmsi_irq_chip,
|
|
};
|
|
|
|
static struct of_device_id its_device_id[] = {
|
|
{ .compatible = "arm,gic-v3-its", },
|
|
{},
|
|
};
|
|
|
|
static int __init its_pmsi_init(void)
|
|
{
|
|
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 (!platform_msi_create_irq_domain(np, &its_pmsi_domain_info,
|
|
parent)) {
|
|
pr_err("%s: unable to create platform domain\n",
|
|
np->full_name);
|
|
continue;
|
|
}
|
|
|
|
pr_info("Platform MSI: %s domain created\n", np->full_name);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
early_initcall(its_pmsi_init);
|