[PATCH] PCI: Move ATS declarations to linux/pci-ats.h

[Krzysztof Wilczynski]

Move ATS function prototypes from include/linux/pci.h
to include/linux/pci-ats.h as the ATS, PRI, and PASID
interfaces are related, and are used only by the IOMMU
drivers.  This effecively reverts the change done in
commit ff9bee895c4d ("PCI: Move ATS declarations to
linux/pci.h so they're all together").

Also, remove surplus forward declaration of struct pci_ats
from include/linux/pci.h, as it is no longer needed, since
the struct pci_ats has been embedded directly into struct
pci_dev in the commit d544d75ac96a ("PCI: Embed ATS info
directly into struct pci_dev").

No functional changes intended.

Signed-off-by: Krzysztof Wilczynski <kw@xxxxxxxxx>
---
Related:
  https://lore.kernel.org/r/20190902211100.GH7013@xxxxxxxxxx
  https://lore.kernel.org/r/20190724233848.73327-9-skunberg.kelsey@xxxxxxxxx

 include/linux/pci-ats.h | 76 +++++++++++++++--------------------------
 include/linux/pci.h     | 14 --------
 2 files changed, 28 insertions(+), 62 deletions(-)

diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
index 1ebb88e7c184..a2001673d445 100644
--- a/include/linux/pci-ats.h
+++ b/include/linux/pci-ats.h
@@ -4,74 +4,54 @@
 
 #include <linux/pci.h>
 
-#ifdef CONFIG_PCI_PRI
+#ifdef CONFIG_PCI_ATS
+/* Address Translation Service */
+int pci_enable_ats(struct pci_dev *dev, int ps);
+void pci_disable_ats(struct pci_dev *dev);
+int pci_ats_queue_depth(struct pci_dev *dev);
+int pci_ats_page_aligned(struct pci_dev *dev);
+#else /* CONFIG_PCI_ATS */
+static inline int pci_enable_ats(struct pci_dev *d, int ps)
+{ return -ENODEV; }
+static inline void pci_disable_ats(struct pci_dev *d) { }
+static inline int pci_ats_queue_depth(struct pci_dev *d)
+{ return -ENODEV; }
+static inline int pci_ats_page_aligned(struct pci_dev *dev)
+{ return 0; }
+#endif /* CONFIG_PCI_ATS */
 
+#ifdef CONFIG_PCI_PRI
 int pci_enable_pri(struct pci_dev *pdev, u32 reqs);
 void pci_disable_pri(struct pci_dev *pdev);
 void pci_restore_pri_state(struct pci_dev *pdev);
 int pci_reset_pri(struct pci_dev *pdev);
-
 #else /* CONFIG_PCI_PRI */
-
 static inline int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
-{
-	return -ENODEV;
-}
-
-static inline void pci_disable_pri(struct pci_dev *pdev)
-{
-}
-
-static inline void pci_restore_pri_state(struct pci_dev *pdev)
-{
-}
-
+{ return -ENODEV; }
+static inline void pci_disable_pri(struct pci_dev *pdev) { }
+static inline void pci_restore_pri_state(struct pci_dev *pdev) { }
 static inline int pci_reset_pri(struct pci_dev *pdev)
-{
-	return -ENODEV;
-}
-
+{ return -ENODEV; }
 #endif /* CONFIG_PCI_PRI */
 
 #ifdef CONFIG_PCI_PASID
-
 int pci_enable_pasid(struct pci_dev *pdev, int features);
 void pci_disable_pasid(struct pci_dev *pdev);
 void pci_restore_pasid_state(struct pci_dev *pdev);
 int pci_pasid_features(struct pci_dev *pdev);
 int pci_max_pasids(struct pci_dev *pdev);
 int pci_prg_resp_pasid_required(struct pci_dev *pdev);
-
-#else  /* CONFIG_PCI_PASID */
-
+#else /* CONFIG_PCI_PASID */
 static inline int pci_enable_pasid(struct pci_dev *pdev, int features)
-{
-	return -EINVAL;
-}
-
-static inline void pci_disable_pasid(struct pci_dev *pdev)
-{
-}
-
-static inline void pci_restore_pasid_state(struct pci_dev *pdev)
-{
-}
-
+{ return -EINVAL; }
+static inline void pci_disable_pasid(struct pci_dev *pdev) { }
+static inline void pci_restore_pasid_state(struct pci_dev *pdev) { }
 static inline int pci_pasid_features(struct pci_dev *pdev)
-{
-	return -EINVAL;
-}
-
+{ return -EINVAL; }
 static inline int pci_max_pasids(struct pci_dev *pdev)
-{
-	return -EINVAL;
-}
-
+{ return -EINVAL; }
 static inline int pci_prg_resp_pasid_required(struct pci_dev *pdev)
-{
-	return 0;
-}
+{ return 0; }
 #endif /* CONFIG_PCI_PASID */
 
-
-#endif /* LINUX_PCI_ATS_H*/
+#endif /* LINUX_PCI_ATS_H */
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 56767f50ad96..5f2ae580bd19 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -284,7 +284,6 @@ struct irq_affinity;
 struct pcie_link_state;
 struct pci_vpd;
 struct pci_sriov;
-struct pci_ats;
 struct pci_p2pdma;
 
 /* The pci_dev structure describes PCI devices */
@@ -1764,19 +1763,6 @@ static inline const struct pci_device_id *pci_match_id(const struct pci_device_i
 static inline bool pci_ats_disabled(void) { return true; }
 #endif /* CONFIG_PCI */
 
-#ifdef CONFIG_PCI_ATS
-/* Address Translation Service */
-int pci_enable_ats(struct pci_dev *dev, int ps);
-void pci_disable_ats(struct pci_dev *dev);
-int pci_ats_queue_depth(struct pci_dev *dev);
-int pci_ats_page_aligned(struct pci_dev *dev);
-#else
-static inline int pci_enable_ats(struct pci_dev *d, int ps) { return -ENODEV; }
-static inline void pci_disable_ats(struct pci_dev *d) { }
-static inline int pci_ats_queue_depth(struct pci_dev *d) { return -ENODEV; }
-static inline int pci_ats_page_aligned(struct pci_dev *dev) { return 0; }
-#endif
-
 /* Include architecture-dependent settings and functions */
 
 #include <asm/pci.h>
-- 
2.23.0