[PATCH v2 1/6] PCI: Add helpers to request/release memory and I/O regions

[Johannes Thumshirn]

Add helpers to request and release a device's memory or I/O regions.

With these helpers in place, one does not need to select a device's memory or
I/O regions with pci_select_bars() prior to requesting or releasing them.

Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Johannes Thumshirn <jthumshirn@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
---
 include/linux/pci.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 932ec74..565c38e 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2007,6 +2007,34 @@ static inline bool pci_is_dev_assigned(struct pci_dev *pdev)
 	return (pdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED) == PCI_DEV_FLAGS_ASSIGNED;
 }
 
+static inline int
+pci_request_io_regions(struct pci_dev *pdev, const char *name)
+{
+	return pci_request_selected_regions(pdev,
+			    pci_select_bars(pdev, IORESOURCE_IO), name);
+}
+
+static inline void
+pci_release_io_regions(struct pci_dev *pdev)
+{
+	return pci_release_selected_regions(pdev,
+			    pci_select_bars(pdev, IORESOURCE_IO));
+}
+
+static inline int
+pci_request_mem_regions(struct pci_dev *pdev, const char *name)
+{
+	return pci_request_selected_regions(pdev,
+			    pci_select_bars(pdev, IORESOURCE_MEM), name);
+}
+
+static inline void
+pci_release_mem_regions(struct pci_dev *pdev)
+{
+	return pci_release_selected_regions(pdev,
+			    pci_select_bars(pdev, IORESOURCE_MEM));
+}
+
 /**
  * pci_ari_enabled - query ARI forwarding status
  * @bus: the PCI bus
-- 
1.8.5.6