Date:   Fri, 11 Nov 2022 14:56:54 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: [patch 11/20] genirq/msi: Make descriptor allocation device domain aware

Change the descriptor allocation and insertion functions to take a domain
id to prepare for the upcoming multi MSI domain per device support.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 include/linux/msi.h |   15 ++++++++++++++-
 kernel/irq/msi.c    |   44 +++++++++++++++++++++++++++++++++++---------
 2 files changed, 49 insertions(+), 10 deletions(-)

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -274,7 +274,20 @@ static inline void msi_desc_set_iommu_co
 }
 #endif
 
-int msi_insert_msi_desc(struct device *dev, struct msi_desc *init_desc);
+int msi_domain_insert_msi_desc(struct device *dev, unsigned int domid,
+			       struct msi_desc *init_desc);
+/**
+ * msi_insert_msi_desc - Allocate and initialize a MSI descriptor in the default domain
+ * @dev:	Pointer to the device for which the descriptor is allocated
+ * @init_desc:	Pointer to an MSI descriptor to initialize the new descriptor
+ *
+ * Return: 0 on success or an appropriate failure code.
+ */
+static inline int msi_insert_msi_desc(struct device *dev, struct msi_desc *init_desc)
+{
+	return msi_domain_insert_msi_desc(dev, MSI_DEFAULT_DOMAIN, init_desc);
+}
+
 void msi_free_msi_descs_range(struct device *dev, unsigned int first_index, unsigned int last_index);
 
 /**
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -63,7 +63,7 @@ static int msi_get_domain_base_index(str
  * Return: pointer to allocated &msi_desc on success or %NULL on failure
  */
 static struct msi_desc *msi_alloc_desc(struct device *dev, int nvec,
-					const struct irq_affinity_desc *affinity)
+				       const struct irq_affinity_desc *affinity)
 {
 	struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
 
@@ -88,39 +88,58 @@ static void msi_free_desc(struct msi_des
 	kfree(desc);
 }
 
-static int msi_insert_desc(struct msi_device_data *md, struct msi_desc *desc, unsigned int index)
+static int msi_insert_desc(struct device *dev, struct msi_desc *desc,
+			   unsigned int domid, unsigned int index)
 {
-	int ret;
+	struct msi_device_data *md = dev->msi.data;
+	int baseidx, ret;
+
+	baseidx = msi_get_domain_base_index(dev, domid);
+	if (baseidx < 0) {
+		ret = baseidx;
+		goto fail;
+	}
 
 	desc->msi_index = index;
+	index += baseidx;
 	ret = xa_insert(&md->__store, index, desc, GFP_KERNEL);
 	if (ret)
-		msi_free_desc(desc);
+		goto fail;
+	return 0;
+
+fail:
+	msi_free_desc(desc);
 	return ret;
 }
 
 /**
- * msi_insert_msi_desc - Allocate and initialize a MSI descriptor and
- *			 insert it at @init_desc->msi_index
+ * msi_domain_insert_msi_desc - Allocate and initialize a MSI descriptor and
+ *				insert it at @init_desc->msi_index
  *
  * @dev:	Pointer to the device for which the descriptor is allocated
+ * @domid:	The id of the interrupt domain to which the desriptor is added
  * @init_desc:	Pointer to an MSI descriptor to initialize the new descriptor
  *
  * Return: 0 on success or an appropriate failure code.
  */
-int msi_insert_msi_desc(struct device *dev, struct msi_desc *init_desc)
+int msi_domain_insert_msi_desc(struct device *dev, unsigned int domid,
+			       struct msi_desc *init_desc)
 {
 	struct msi_desc *desc;
 
 	lockdep_assert_held(&dev->msi.data->mutex);
 
+	if (WARN_ON_ONCE(init_desc->msi_index >= MSI_MAX_INDEX))
+		return -EINVAL;
+
 	desc = msi_alloc_desc(dev, init_desc->nvec_used, init_desc->affinity);
 	if (!desc)
 		return -ENOMEM;
 
 	/* Copy type specific data to the new descriptor. */
 	desc->pci = init_desc->pci;
-	return msi_insert_desc(dev->msi.data, desc, init_desc->msi_index);
+
+	return msi_insert_desc(dev, desc, domid, init_desc->msi_index);
 }
 
 /**
@@ -143,7 +162,7 @@ static int msi_add_simple_msi_descs(stru
 		desc = msi_alloc_desc(dev, 1, NULL);
 		if (!desc)
 			goto fail_mem;
-		ret = msi_insert_desc(dev->msi.data, desc, idx);
+		ret = msi_insert_desc(dev, desc, MSI_DEFAULT_DOMAIN, idx);
 		if (ret)
 			goto fail;
 	}
@@ -183,6 +202,9 @@ void msi_free_msi_descs_range(struct dev
 	struct msi_desc *desc;
 	unsigned long idx;
 
+	if (WARN_ON_ONCE(first_index >= MSI_MAX_INDEX || last_index >= MSI_MAX_INDEX))
+		return;
+
 	lockdep_assert_held(&dev->msi.data->mutex);
 
 	xa_for_each_range(xa, idx, desc, first_index, last_index) {
@@ -779,6 +801,10 @@ int msi_domain_populate_irqs(struct irq_
 	struct msi_desc *desc;
 	int ret, virq;
 
+	if (WARN_ON_ONCE(virq_base >= MSI_MAX_INDEX ||
+			 (virq_base + nvec) >= MSI_MAX_INDEX))
+		return 0;
+
 	msi_lock_descs(dev);
 	ret = msi_add_simple_msi_descs(dev, virq_base, nvec);
 	if (ret)

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