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Message-ID: <167026471878.4906.4045436780799669198.tip-bot2@tip-bot2>
Date: Mon, 05 Dec 2022 18:25:18 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
Kevin Tian <kevin.tian@...el.com>,
Marc Zyngier <maz@...nel.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: irq/core] genirq/msi: Provide new domain id based interfaces
for freeing interrupts
The following commit has been merged into the irq/core branch of tip:
Commit-ID: 4cd5f4403f283766f73749c4c936801f58ffe77a
Gitweb: https://git.kernel.org/tip/4cd5f4403f283766f73749c4c936801f58ffe77a
Author: Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Fri, 25 Nov 2022 00:24:33 +01:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Mon, 05 Dec 2022 19:21:00 +01:00
genirq/msi: Provide new domain id based interfaces for freeing interrupts
Provide two sorts of interfaces to handle the different use cases:
- msi_domain_free_irqs_range():
Handles a caller defined precise range
- msi_domain_free_irqs_all():
Frees all interrupts associated to a domain
The latter is useful for device teardown and to handle the legacy MSI support
which does not have any range information available.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Acked-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20221124230314.337844751@linutronix.de
---
include/linux/msi.h | 9 +++-
kernel/irq/msi.c | 142 ++++++++++++++++++++++++++++++++++++-------
2 files changed, 129 insertions(+), 22 deletions(-)
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 23172d6..74cb0a9 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -498,6 +498,15 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
int nvec);
void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev);
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
+
+void msi_domain_free_irqs_range_locked(struct device *dev, unsigned int domid,
+ unsigned int first, unsigned int last);
+void msi_domain_free_irqs_range(struct device *dev, unsigned int domid,
+ unsigned int first, unsigned int last);
+
+void msi_domain_free_irqs_all_locked(struct device *dev, unsigned int domid);
+void msi_domain_free_irqs_all(struct device *dev, unsigned int domid);
+
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);
struct irq_domain *platform_msi_create_irq_domain(struct fwnode_handle *fwnode,
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 64a4cc8..c1ac780 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -545,7 +545,25 @@ static inline void msi_sysfs_remove_desc(struct device *dev, struct msi_desc *de
#endif /* !CONFIG_SYSFS */
static int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, int nvec);
-static void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
+
+static struct irq_domain *msi_get_device_domain(struct device *dev, unsigned int domid)
+{
+ struct irq_domain *domain;
+
+ lockdep_assert_held(&dev->msi.data->mutex);
+
+ if (WARN_ON_ONCE(domid >= MSI_MAX_DEVICE_IRQDOMAINS))
+ return NULL;
+
+ domain = dev->msi.data->__domains[domid].domain;
+ if (!domain)
+ return NULL;
+
+ if (WARN_ON_ONCE(irq_domain_is_msi_parent(domain)))
+ return NULL;
+
+ return domain;
+}
static inline void irq_chip_write_msi_msg(struct irq_data *data,
struct msi_msg *msg)
@@ -706,7 +724,6 @@ static struct msi_domain_ops msi_domain_ops_default = {
.msi_prepare = msi_domain_ops_prepare,
.set_desc = msi_domain_ops_set_desc,
.domain_alloc_irqs = __msi_domain_alloc_irqs,
- .domain_free_irqs = __msi_domain_free_irqs,
};
static void msi_domain_update_dom_ops(struct msi_domain_info *info)
@@ -720,8 +737,6 @@ static void msi_domain_update_dom_ops(struct msi_domain_info *info)
if (ops->domain_alloc_irqs == NULL)
ops->domain_alloc_irqs = msi_domain_ops_default.domain_alloc_irqs;
- if (ops->domain_free_irqs == NULL)
- ops->domain_free_irqs = msi_domain_ops_default.domain_free_irqs;
if (!(info->flags & MSI_FLAG_USE_DEF_DOM_OPS))
return;
@@ -1073,15 +1088,21 @@ int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, int nve
return ret;
}
-static void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
+static void __msi_domain_free_irqs(struct device *dev, struct irq_domain *domain,
+ struct msi_ctrl *ctrl)
{
+ struct xarray *xa = &dev->msi.data->__domains[ctrl->domid].store;
struct msi_domain_info *info = domain->host_data;
struct irq_data *irqd;
struct msi_desc *desc;
+ unsigned long idx;
int i;
- /* Only handle MSI entries which have an interrupt associated */
- msi_for_each_desc(desc, dev, MSI_DESC_ASSOCIATED) {
+ xa_for_each_range(xa, idx, desc, ctrl->first, ctrl->last) {
+ /* Only handle MSI entries which have an interrupt associated */
+ if (!msi_desc_match(desc, MSI_DESC_ASSOCIATED))
+ continue;
+
/* Make sure all interrupts are deactivated */
for (i = 0; i < desc->nvec_used; i++) {
irqd = irq_domain_get_irq_data(domain, desc->irq + i);
@@ -1096,11 +1117,99 @@ static void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev
}
}
-static void msi_domain_free_msi_descs(struct msi_domain_info *info,
- struct device *dev)
+static void msi_domain_free_locked(struct device *dev, struct msi_ctrl *ctrl)
{
+ struct msi_domain_info *info;
+ struct msi_domain_ops *ops;
+ struct irq_domain *domain;
+
+ if (!msi_ctrl_valid(dev, ctrl))
+ return;
+
+ domain = msi_get_device_domain(dev, ctrl->domid);
+ if (!domain)
+ return;
+
+ info = domain->host_data;
+ ops = info->ops;
+
+ if (ops->domain_free_irqs)
+ ops->domain_free_irqs(domain, dev);
+ else
+ __msi_domain_free_irqs(dev, domain, ctrl);
+
+ if (ops->msi_post_free)
+ ops->msi_post_free(domain, dev);
+
if (info->flags & MSI_FLAG_FREE_MSI_DESCS)
- msi_free_msi_descs(dev);
+ msi_domain_free_descs(dev, ctrl);
+}
+
+/**
+ * msi_domain_free_irqs_range_locked - Free a range of interrupts from a MSI interrupt domain
+ * associated to @dev with msi_lock held
+ * @dev: Pointer to device struct of the device for which the interrupts
+ * are freed
+ * @domid: Id of the interrupt domain to operate on
+ * @first: First index to free (inclusive)
+ * @last: Last index to free (inclusive)
+ */
+void msi_domain_free_irqs_range_locked(struct device *dev, unsigned int domid,
+ unsigned int first, unsigned int last)
+{
+ struct msi_ctrl ctrl = {
+ .domid = domid,
+ .first = first,
+ .last = last,
+ };
+ msi_domain_free_locked(dev, &ctrl);
+}
+
+/**
+ * msi_domain_free_irqs_range - Free a range of interrupts from a MSI interrupt domain
+ * associated to @dev
+ * @dev: Pointer to device struct of the device for which the interrupts
+ * are freed
+ * @domid: Id of the interrupt domain to operate on
+ * @first: First index to free (inclusive)
+ * @last: Last index to free (inclusive)
+ */
+void msi_domain_free_irqs_range(struct device *dev, unsigned int domid,
+ unsigned int first, unsigned int last)
+{
+ msi_lock_descs(dev);
+ msi_domain_free_irqs_range_locked(dev, domid, first, last);
+ msi_unlock_descs(dev);
+}
+
+/**
+ * msi_domain_free_irqs_all_locked - Free all interrupts from a MSI interrupt domain
+ * associated to a device
+ * @dev: Pointer to device struct of the device for which the interrupts
+ * are freed
+ * @domid: The id of the domain to operate on
+ *
+ * Must be invoked from within a msi_lock_descs() / msi_unlock_descs()
+ * pair. Use this for MSI irqdomains which implement their own vector
+ * allocation.
+ */
+void msi_domain_free_irqs_all_locked(struct device *dev, unsigned int domid)
+{
+ msi_domain_free_irqs_range_locked(dev, domid, 0, MSI_MAX_INDEX);
+}
+
+/**
+ * msi_domain_free_irqs_all - Free all interrupts from a MSI interrupt domain
+ * associated to a device
+ * @dev: Pointer to device struct of the device for which the interrupts
+ * are freed
+ * @domid: The id of the domain to operate on
+ */
+void msi_domain_free_irqs_all(struct device *dev, unsigned int domid)
+{
+ msi_lock_descs(dev);
+ msi_domain_free_irqs_all_locked(dev, domid);
+ msi_unlock_descs(dev);
}
/**
@@ -1115,18 +1224,7 @@ static void msi_domain_free_msi_descs(struct msi_domain_info *info,
*/
void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev)
{
- struct msi_domain_info *info = domain->host_data;
- struct msi_domain_ops *ops = info->ops;
-
- lockdep_assert_held(&dev->msi.data->mutex);
-
- if (WARN_ON_ONCE(irq_domain_is_msi_parent(domain)))
- return;
-
- ops->domain_free_irqs(domain, dev);
- if (ops->msi_post_free)
- ops->msi_post_free(domain, dev);
- msi_domain_free_msi_descs(info, dev);
+ msi_domain_free_irqs_range_locked(dev, MSI_DEFAULT_DOMAIN, 0, MSI_MAX_INDEX);
}
/**
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