linux-kernel - [PATCH v2 1/7] Revert "PCI/MSI: Provide stubs for IMS functions"

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Message-Id: <20240410221307.2162676-2-helgaas@kernel.org>
Date: Wed, 10 Apr 2024 17:13:01 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: linux-pci@...r.kernel.org,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Kevin Tian <kevin.tian@...el.com>,
	Marc Zyngier <maz@...nel.org>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Megha Dey <megha.dey@...el.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Robin Murphy <robin.murphy@....com>,
	David Woodhouse <dwmw2@...radead.org>,
	Lu Baolu <baolu.lu@...ux.intel.com>,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v2 1/7] Revert "PCI/MSI: Provide stubs for IMS functions"

From: Bjorn Helgaas <bhelgaas@...gle.com>

This reverts commit 41efa431244f6498833ff8ee8dde28c4924c5479.

IMS (Interrupt Message Store) support appeared in v6.2, but there are no
users yet.

Remove it for now.  We can add it back when a user comes along.  If this is
re-added later, this could be squashed with these commits:

  0194425af0c8 ("PCI/MSI: Provide IMS (Interrupt Message Store) support")
  c9e5bea27383 ("PCI/MSI: Provide pci_ims_alloc/free_irq()")

which added the non-stub implementations.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
---
 include/linux/pci.h | 34 ++++++++--------------------------
 1 file changed, 8 insertions(+), 26 deletions(-)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 16493426a04f..abbef75b2b92 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1658,8 +1658,6 @@ struct msix_entry {
 	u16	entry;	/* Driver uses to specify entry, OS writes */
 };
 
-struct msi_domain_template;
-
 #ifdef CONFIG_PCI_MSI
 int pci_msi_vec_count(struct pci_dev *dev);
 void pci_disable_msi(struct pci_dev *dev);
@@ -1692,11 +1690,6 @@ void pci_msix_free_irq(struct pci_dev *pdev, struct msi_map map);
 void pci_free_irq_vectors(struct pci_dev *dev);
 int pci_irq_vector(struct pci_dev *dev, unsigned int nr);
 const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev, int vec);
-bool pci_create_ims_domain(struct pci_dev *pdev, const struct msi_domain_template *template,
-			   unsigned int hwsize, void *data);
-struct msi_map pci_ims_alloc_irq(struct pci_dev *pdev, union msi_instance_cookie *icookie,
-				 const struct irq_affinity_desc *affdesc);
-void pci_ims_free_irq(struct pci_dev *pdev, struct msi_map map);
 
 #else
 static inline int pci_msi_vec_count(struct pci_dev *dev) { return -ENOSYS; }
@@ -1760,25 +1753,6 @@ static inline const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev,
 {
 	return cpu_possible_mask;
 }
-
-static inline bool pci_create_ims_domain(struct pci_dev *pdev,
-					 const struct msi_domain_template *template,
-					 unsigned int hwsize, void *data)
-{ return false; }
-
-static inline struct msi_map pci_ims_alloc_irq(struct pci_dev *pdev,
-					       union msi_instance_cookie *icookie,
-					       const struct irq_affinity_desc *affdesc)
-{
-	struct msi_map map = { .index = -ENOSYS, };
-
-	return map;
-}
-
-static inline void pci_ims_free_irq(struct pci_dev *pdev, struct msi_map map)
-{
-}
-
 #endif
 
 /**
@@ -2690,6 +2664,14 @@ static inline bool pci_is_thunderbolt_attached(struct pci_dev *pdev)
 void pci_uevent_ers(struct pci_dev *pdev, enum  pci_ers_result err_type);
 #endif
 
+struct msi_domain_template;
+
+bool pci_create_ims_domain(struct pci_dev *pdev, const struct msi_domain_template *template,
+			   unsigned int hwsize, void *data);
+struct msi_map pci_ims_alloc_irq(struct pci_dev *pdev, union msi_instance_cookie *icookie,
+				 const struct irq_affinity_desc *affdesc);
+void pci_ims_free_irq(struct pci_dev *pdev, struct msi_map map);
+
 #include <linux/dma-mapping.h>
 
 #define pci_printk(level, pdev, fmt, arg...) \
-- 
2.34.1