linux-kernel - [patch 04/10] genirq/msi: Prepare MSI domain alloc/free for range irq allocation

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Date:   Sat, 27 Nov 2021 02:25:03 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Cooper <amc96@....ac.uk>,
        Juergen Gross <jgross@...e.com>, linux-pci@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: [patch 04/10] genirq/msi: Prepare MSI domain alloc/free for range irq
 allocation

Make the iterators in the allocation and free functions range based.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/irq/msi.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -877,6 +877,7 @@ int __msi_domain_alloc_irqs(struct irq_d
 	msi_alloc_info_t arg = { };
 	unsigned int vflags = 0;
 	struct msi_desc *desc;
+	unsigned long idx;
 	int allocated = 0;
 	int i, ret, virq;
 
@@ -906,7 +907,10 @@ int __msi_domain_alloc_irqs(struct irq_d
 			vflags |= VIRQ_NOMASK_QUIRK;
 	}
 
-	msi_for_each_desc(desc, dev, MSI_DESC_NOTASSOCIATED) {
+	xa_for_each_range(&dev->msi.data->store, idx, desc, range->first, range->last) {
+		if (!msi_desc_match(desc, MSI_DESC_NOTASSOCIATED))
+			continue;
+
 		ops->set_desc(&arg, desc);
 
 		virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
@@ -999,10 +1003,14 @@ void __msi_domain_free_irqs(struct irq_d
 	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(&dev->msi.data->store, idx, desc, range->first, range->last) {
+		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);