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 <htejun@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 9010f54..b7e4b63 100644 (file)
--- 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
index b1d336c..edc27a5 100644 (file)
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -298,6 +298,31 @@ 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
  * @mask: Mask of BARs to unmap and release