devres: implement pcim_iomap_regions_request_all()

Some drivers need to reserve all PCI BARs to prevent other drivers misusing unoccupied BARs. pcim_iomap_regions_request_all() requests all BARs and iomap specified BARs. Signed-off-by: Tejun Heo <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Alan Cox <[email protected]> Cc: Jeff Garzik <[email protected]> Signed-off-by: Jeff Garzik <[email protected]>
rlawoehd187 · Mar 17, 2008 · 916fbfb · 916fbfb
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diff --git a/include/linux/pci.h b/include/linux/pci.h
@@ -1045,6 +1045,8 @@ void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
 void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr);
 void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
 int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name);
+int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask,
+				   const char *name);
 void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask);
 
 extern int pci_pci_problems;

diff --git a/lib/devres.c b/lib/devres.c
@@ -297,6 +297,31 @@ int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
 }
 EXPORT_SYMBOL(pcim_iomap_regions);
 
+/**
+ * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
+ * @pdev: PCI device to map IO resources for
+ * @mask: Mask of BARs to iomap
+ * @name: Name used when requesting regions
+ *
+ * Request all PCI BARs and iomap regions specified by @mask.
+ */
+int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask,
+				   const char *name)
+{
+	int request_mask = ((1 << 6) - 1) & ~mask;
+	int rc;
+
+	rc = pci_request_selected_regions(pdev, request_mask, name);
+	if (rc)
+		return rc;
+
+	rc = pcim_iomap_regions(pdev, mask, name);
+	if (rc)
+		pci_release_selected_regions(pdev, request_mask);
+	return rc;
+}
+EXPORT_SYMBOL(pcim_iomap_regions_request_all);
+
 /**
  * pcim_iounmap_regions - Unmap and release PCI BARs
  * @pdev: PCI device to map IO resources for