linux-kernel - [patch 25/32] platform-msi: Let core code handle MSI descriptors

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Date:   Sat, 27 Nov 2021 02:24:07 +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>, linux-pci@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>, linux-ntb@...glegroups.com
Subject: [patch 25/32] platform-msi: Let core code handle MSI descriptors

Use the core functionality for platform MSI interrupt domains. The platform
device MSI interrupt domains will be converted in a later step.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/base/platform-msi.c |  112 ++++++++++++++++++--------------------------
 1 file changed, 48 insertions(+), 64 deletions(-)

--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -107,57 +107,6 @@ static void platform_msi_update_chip_ops
 		info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
 }
 
-static void platform_msi_free_descs(struct device *dev, int base, int nvec)
-{
-	struct msi_desc *desc, *tmp;
-
-	list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
-		if (desc->msi_index >= base &&
-		    desc->msi_index < (base + nvec)) {
-			list_del(&desc->list);
-			free_msi_entry(desc);
-		}
-	}
-}
-
-static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
-					     int nvec)
-{
-	struct msi_desc *desc;
-	int i, base = 0;
-
-	if (!list_empty(dev_to_msi_list(dev))) {
-		desc = list_last_entry(dev_to_msi_list(dev),
-				       struct msi_desc, list);
-		base = desc->msi_index + 1;
-	}
-
-	for (i = 0; i < nvec; i++) {
-		desc = alloc_msi_entry(dev, 1, NULL);
-		if (!desc)
-			break;
-
-		desc->msi_index = base + i;
-		desc->irq = virq ? virq + i : 0;
-
-		list_add_tail(&desc->list, dev_to_msi_list(dev));
-	}
-
-	if (i != nvec) {
-		/* Clean up the mess */
-		platform_msi_free_descs(dev, base, nvec);
-
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static int platform_msi_alloc_descs(struct device *dev, int nvec)
-{
-	return platform_msi_alloc_descs_with_irq(dev, 0, nvec);
-}
-
 /**
  * platform_msi_create_irq_domain - Create a platform MSI interrupt domain
  * @fwnode:		Optional fwnode of the interrupt controller
@@ -180,7 +129,8 @@ struct irq_domain *platform_msi_create_i
 		platform_msi_update_dom_ops(info);
 	if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
 		platform_msi_update_chip_ops(info);
-	info->flags |= MSI_FLAG_DEV_SYSFS;
+	info->flags |= MSI_FLAG_DEV_SYSFS | MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS |
+		       MSI_FLAG_FREE_MSI_DESCS;
 
 	domain = msi_create_irq_domain(fwnode, info, parent);
 	if (domain)
@@ -262,20 +212,10 @@ int platform_msi_domain_alloc_irqs(struc
 	if (err)
 		return err;
 
-	err = platform_msi_alloc_descs(dev, nvec);
-	if (err)
-		goto out_free_priv_data;
-
 	err = msi_domain_alloc_irqs(dev->msi.domain, dev, nvec);
 	if (err)
-		goto out_free_desc;
-
-	return 0;
+		platform_msi_free_priv_data(dev);
 
-out_free_desc:
-	platform_msi_free_descs(dev, 0, nvec);
-out_free_priv_data:
-	platform_msi_free_priv_data(dev);
 	return err;
 }
 EXPORT_SYMBOL_GPL(platform_msi_domain_alloc_irqs);
@@ -287,7 +227,6 @@ EXPORT_SYMBOL_GPL(platform_msi_domain_al
 void platform_msi_domain_free_irqs(struct device *dev)
 {
 	msi_domain_free_irqs(dev->msi.domain, dev);
-	platform_msi_free_descs(dev, 0, MAX_DEV_MSIS);
 	platform_msi_free_priv_data(dev);
 }
 EXPORT_SYMBOL_GPL(platform_msi_domain_free_irqs);
@@ -361,6 +300,51 @@ struct irq_domain *
 	return NULL;
 }
 
+static void platform_msi_free_descs(struct device *dev, int base, int nvec)
+{
+	struct msi_desc *desc, *tmp;
+
+	list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
+		if (desc->msi_index >= base &&
+		    desc->msi_index < (base + nvec)) {
+			list_del(&desc->list);
+			free_msi_entry(desc);
+		}
+	}
+}
+
+static int platform_msi_alloc_descs_with_irq(struct device *dev, int virq,
+					     int nvec)
+{
+	struct msi_desc *desc;
+	int i, base = 0;
+
+	if (!list_empty(dev_to_msi_list(dev))) {
+		desc = list_last_entry(dev_to_msi_list(dev),
+				       struct msi_desc, list);
+		base = desc->msi_index + 1;
+	}
+
+	for (i = 0; i < nvec; i++) {
+		desc = alloc_msi_entry(dev, 1, NULL);
+		if (!desc)
+			break;
+
+		desc->msi_index = base + i;
+		desc->irq = virq + i;
+
+		list_add_tail(&desc->list, dev_to_msi_list(dev));
+	}
+
+	if (i != nvec) {
+		/* Clean up the mess */
+		platform_msi_free_descs(dev, base, nvec);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
 /**
  * platform_msi_device_domain_free - Free interrupts associated with a platform-msi
  *				     device domain