PCI : Add selected_regions funcs

This patch adds the following changes into generic PCI code especially
for PCI legacy I/O port free drivers.

     - Added new pci_request_selected_regions() and
       pci_release_selected_regions() for PCI legacy I/O port free
       drivers in order to request/release only the selected regions.

     - Added helper routine pci_select_bars() which makes proper mask
       of BARs from the specified resource type. This would be very
       helpful for users of pci_enable_device_bars().

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Inaky Perez-Gonzalez <inaky@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/pci.c

@@ -921,6 +921,47 @@ int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
 	return -EBUSY;
 }
 
+/**
+ * pci_release_selected_regions - Release selected PCI I/O and memory resources
+ * @pdev: PCI device whose resources were previously reserved
+ * @bars: Bitmask of BARs to be released
+ *
+ * Release selected PCI I/O and memory resources previously reserved.
+ * Call this function only after all use of the PCI regions has ceased.
+ */
+void pci_release_selected_regions(struct pci_dev *pdev, int bars)
+{
+	int i;
+
+	for (i = 0; i < 6; i++)
+		if (bars & (1 << i))
+			pci_release_region(pdev, i);
+}
+
+/**
+ * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
+ * @pdev: PCI device whose resources are to be reserved
+ * @bars: Bitmask of BARs to be requested
+ * @res_name: Name to be associated with resource
+ */
+int pci_request_selected_regions(struct pci_dev *pdev, int bars,
+				 const char *res_name)
+{
+	int i;
+
+	for (i = 0; i < 6; i++)
+		if (bars & (1 << i))
+			if(pci_request_region(pdev, i, res_name))
+				goto err_out;
+	return 0;
+
+err_out:
+	while(--i >= 0)
+		if (bars & (1 << i))
+			pci_release_region(pdev, i);
+
+	return -EBUSY;
+}
 
 /**
  *	pci_release_regions - Release reserved PCI I/O and memory resources
@@ -933,10 +974,7 @@ int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
 
 void pci_release_regions(struct pci_dev *pdev)
 {
-	int i;
-
-	for (i = 0; i < 6; i++)
-		pci_release_region(pdev, i);
+	pci_release_selected_regions(pdev, (1 << 6) - 1);
 }
 
 /**
@@ -954,18 +992,7 @@ void pci_release_regions(struct pci_dev *pdev)
  */
 int pci_request_regions(struct pci_dev *pdev, const char *res_name)
 {
-	int i;
-
-	for (i = 0; i < 6; i++)
-		if(pci_request_region(pdev, i, res_name))
-			goto err_out;
-	return 0;
-
-err_out:
-	while(--i >= 0)
-		pci_release_region(pdev, i);
-
-	return -EBUSY;
+	return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name);
 }
 
 /**
@@ -1148,7 +1175,23 @@ pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
 	return 0;
 }
 #endif
-
+
+/**
+ * pci_select_bars - Make BAR mask from the type of resource
+ * @pdev: the PCI device for which BAR mask is made
+ * @flags: resource type mask to be selected
+ *
+ * This helper routine makes bar mask from the type of resource.
+ */
+int pci_select_bars(struct pci_dev *dev, unsigned long flags)
+{
+	int i, bars = 0;
+	for (i = 0; i < PCI_NUM_RESOURCES; i++)
+		if (pci_resource_flags(dev, i) & flags)
+			bars |= (1 << i);
+	return bars;
+}
+
 static int __devinit pci_init(void)
 {
 	struct pci_dev *dev = NULL;
@@ -1197,6 +1240,8 @@ EXPORT_SYMBOL(pci_release_regions);
 EXPORT_SYMBOL(pci_request_regions);
 EXPORT_SYMBOL(pci_release_region);
 EXPORT_SYMBOL(pci_request_region);
+EXPORT_SYMBOL(pci_release_selected_regions);
+EXPORT_SYMBOL(pci_request_selected_regions);
 EXPORT_SYMBOL(pci_set_master);
 EXPORT_SYMBOL(pci_set_mwi);
 EXPORT_SYMBOL(pci_clear_mwi);
@@ -1205,6 +1250,7 @@ EXPORT_SYMBOL(pci_set_dma_mask);
 EXPORT_SYMBOL(pci_set_consistent_dma_mask);
 EXPORT_SYMBOL(pci_assign_resource);
 EXPORT_SYMBOL(pci_find_parent_resource);
+EXPORT_SYMBOL(pci_select_bars);
 
 EXPORT_SYMBOL(pci_set_power_state);
 EXPORT_SYMBOL(pci_save_state);

include/linux/pci.h

@@ -533,6 +533,7 @@ void pci_update_resource(struct pci_dev *dev, struct resource *res, int resno);
 int __must_check pci_assign_resource(struct pci_dev *dev, int i);
 int __must_check pci_assign_resource_fixed(struct pci_dev *dev, int i);
 void pci_restore_bars(struct pci_dev *dev);
+int pci_select_bars(struct pci_dev *dev, unsigned long flags);
 
 /* ROM control related routines */
 void __iomem __must_check *pci_map_rom(struct pci_dev *pdev, size_t *size);
@@ -561,6 +562,8 @@ int __must_check pci_request_regions(struct pci_dev *, const char *);
 void pci_release_regions(struct pci_dev *);
 int __must_check pci_request_region(struct pci_dev *, int, const char *);
 void pci_release_region(struct pci_dev *, int);
+int pci_request_selected_regions(struct pci_dev *, int, const char *);
+void pci_release_selected_regions(struct pci_dev *, int);
 
 /* drivers/pci/bus.c */
 int __must_check pci_bus_alloc_resource(struct pci_bus *bus,