[tip: irq/msi] genirq/msi: Handle PCI/MSI allocation fail in core code

["tip-bot2 for Thomas Gleixner" <tip-bot2@linutronix.de>]

The following commit has been merged into the irq/msi branch of tip:

Commit-ID:     890337624e1fa2da079fc1c036a62d178c985280
Gitweb:        https://git.kernel.org/tip/890337624e1fa2da079fc1c036a62d178c985280
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Mon, 06 Dec 2021 23:27:59 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 09 Dec 2021 11:52:22 +01:00

genirq/msi: Handle PCI/MSI allocation fail in core code

Get rid of yet another irqdomain callback and let the core code return the
already available information of how many descriptors could be allocated.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>	# PCI
Link: https://lore.kernel.org/r/20211206210225.046615302@linutronix.de

---
 drivers/pci/msi/irqdomain.c | 13 -------------
 include/linux/msi.h         |  5 +----
 kernel/irq/msi.c            | 29 +++++++++++++++++++++++++----
 3 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/pci/msi/irqdomain.c b/drivers/pci/msi/irqdomain.c
index 6abd8af..a554690 100644
--- a/drivers/pci/msi/irqdomain.c
+++ b/drivers/pci/msi/irqdomain.c
@@ -95,16 +95,6 @@ static int pci_msi_domain_check_cap(struct irq_domain *domain,
 	return 0;
 }
 
-static int pci_msi_domain_handle_error(struct irq_domain *domain,
-				       struct msi_desc *desc, int error)
-{
-	/* Special handling to support __pci_enable_msi_range() */
-	if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
-		return 1;
-
-	return error;
-}
-
 static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
 				    struct msi_desc *desc)
 {
@@ -115,7 +105,6 @@ static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
 static struct msi_domain_ops pci_msi_domain_ops_default = {
 	.set_desc	= pci_msi_domain_set_desc,
 	.msi_check	= pci_msi_domain_check_cap,
-	.handle_error	= pci_msi_domain_handle_error,
 };
 
 static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
@@ -129,8 +118,6 @@ static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
 			ops->set_desc = pci_msi_domain_set_desc;
 		if (ops->msi_check == NULL)
 			ops->msi_check = pci_msi_domain_check_cap;
-		if (ops->handle_error == NULL)
-			ops->handle_error = pci_msi_domain_handle_error;
 	}
 }
 
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 5248678..ba4a39c 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -286,7 +286,6 @@ struct msi_domain_info;
  * @msi_check:		Callback for verification of the domain/info/dev data
  * @msi_prepare:	Prepare the allocation of the interrupts in the domain
  * @set_desc:		Set the msi descriptor for an interrupt
- * @handle_error:	Optional error handler if the allocation fails
  * @domain_alloc_irqs:	Optional function to override the default allocation
  *			function.
  * @domain_free_irqs:	Optional function to override the default free
@@ -295,7 +294,7 @@ struct msi_domain_info;
  * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying
  * irqdomain.
  *
- * @msi_check, @msi_prepare, @handle_error and @set_desc are callbacks used by
+ * @msi_check, @msi_prepare and @set_desc are callbacks used by
  * msi_domain_alloc/free_irqs().
  *
  * @domain_alloc_irqs, @domain_free_irqs can be used to override the
@@ -332,8 +331,6 @@ struct msi_domain_ops {
 				       msi_alloc_info_t *arg);
 	void		(*set_desc)(msi_alloc_info_t *arg,
 				    struct msi_desc *desc);
-	int		(*handle_error)(struct irq_domain *domain,
-					struct msi_desc *desc, int error);
 	int		(*domain_alloc_irqs)(struct irq_domain *domain,
 					     struct device *dev, int nvec);
 	void		(*domain_free_irqs)(struct irq_domain *domain,
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 7d78d8a..4a7a7f0 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -538,6 +538,27 @@ static bool msi_check_reservation_mode(struct irq_domain *domain,
 	return desc->pci.msi_attrib.is_msix || desc->pci.msi_attrib.can_mask;
 }
 
+static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc,
+			       int allocated)
+{
+	switch(domain->bus_token) {
+	case DOMAIN_BUS_PCI_MSI:
+	case DOMAIN_BUS_VMD_MSI:
+		if (IS_ENABLED(CONFIG_PCI_MSI))
+			break;
+		fallthrough;
+	default:
+		return -ENOSPC;
+	}
+
+	/* Let a failed PCI multi MSI allocation retry */
+	if (desc->nvec_used > 1)
+		return 1;
+
+	/* If there was a successful allocation let the caller know */
+	return allocated ? allocated : -ENOSPC;
+}
+
 int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 			    int nvec)
 {
@@ -546,6 +567,7 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 	struct irq_data *irq_data;
 	struct msi_desc *desc;
 	msi_alloc_info_t arg = { };
+	int allocated = 0;
 	int i, ret, virq;
 	bool can_reserve;
 
@@ -560,16 +582,15 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
 					       dev_to_node(dev), &arg, false,
 					       desc->affinity);
 		if (virq < 0) {
-			ret = -ENOSPC;
-			if (ops->handle_error)
-				ret = ops->handle_error(domain, desc, ret);
-			return ret;
+			ret = msi_handle_pci_fail(domain, desc, allocated);
+			goto cleanup;
 		}
 
 		for (i = 0; i < desc->nvec_used; i++) {
 			irq_set_msi_desc_off(virq, i, desc);
 			irq_debugfs_copy_devname(virq + i, dev);
 		}
+		allocated++;
 	}
 
 	can_reserve = msi_check_reservation_mode(domain, info, dev);