[PATCH] iomap: make PCI iomap stuff excluded when PCI isn't configured

[Tejun Heo]

devres iomap made lib/iomap.c always built and added several
arch-indep PCI routines to include/linux/io.h and lib/iomap.c without
wrapping them inside CONFIG_PCI.  This breaks configurations where PCI
is not configured.  Wrap pci_iomap() in CONFIG_PCI and move managed
PCI iomap functions into include/linux/pci.h and drivers/pci/pci.c.

Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---
Heiko, how about this?  Does it fix s390?

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 8b44cff..d6ec47a 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1314,6 +1314,158 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags)
	return bars;
}

+/*
+ * PCI iomap devres
+ */
+#define PCIM_IOMAP_MAX	PCI_ROM_RESOURCE
+
+struct pcim_iomap_devres {
+	void __iomem *table[PCIM_IOMAP_MAX];
+};
+
+static void pcim_iomap_release(struct device *gendev, void *res)
+{
+	struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
+	struct pcim_iomap_devres *this = res;
+	int i;
+
+	for (i = 0; i < PCIM_IOMAP_MAX; i++)
+		if (this->table[i])
+			pci_iounmap(dev, this->table[i]);
+}
+
+/**
+ * pcim_iomap_table - access iomap allocation table
+ * @pdev: PCI device to access iomap table for
+ *
+ * Access iomap allocation table for @dev.  If iomap table doesn't
+ * exist and @pdev is managed, it will be allocated.  All iomaps
+ * recorded in the iomap table are automatically unmapped on driver
+ * detach.
+ *
+ * This function might sleep when the table is first allocated but can
+ * be safely called without context and guaranteed to succed once
+ * allocated.
+ */
+void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
+{
+	struct pcim_iomap_devres *dr, *new_dr;
+
+	dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
+	if (dr)
+		return dr->table;
+
+	new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
+	if (!new_dr)
+		return NULL;
+	dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
+	return dr->table;
+}
+EXPORT_SYMBOL(pcim_iomap_table);
+
+/**
+ * pcim_iomap - Managed pcim_iomap()
+ * @pdev: PCI device to iomap for
+ * @bar: BAR to iomap
+ * @maxlen: Maximum length of iomap
+ *
+ * Managed pci_iomap().  Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
+{
+	void __iomem **tbl;
+
+	BUG_ON(bar >= PCIM_IOMAP_MAX);
+
+	tbl = (void __iomem **)pcim_iomap_table(pdev);
+	if (!tbl || tbl[bar])	/* duplicate mappings not allowed */
+		return NULL;
+
+	tbl[bar] = pci_iomap(pdev, bar, maxlen);
+	return tbl[bar];
+}
+EXPORT_SYMBOL(pcim_iomap);
+
+/**
+ * pcim_iounmap - Managed pci_iounmap()
+ * @pdev: PCI device to iounmap for
+ * @addr: Address to unmap
+ *
+ * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
+ */
+void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
+{
+	void __iomem **tbl;
+	int i;
+
+	pci_iounmap(pdev, addr);
+
+	tbl = (void __iomem **)pcim_iomap_table(pdev);
+	BUG_ON(!tbl);
+
+	for (i = 0; i < PCIM_IOMAP_MAX; i++)
+		if (tbl[i] == addr) {
+			tbl[i] = NULL;
+			return;
+		}
+	WARN_ON(1);
+}
+EXPORT_SYMBOL(pcim_iounmap);
+
+/**
+ * pcim_iomap_regions - Request and iomap PCI BARs
+ * @pdev: PCI device to map IO resources for
+ * @mask: Mask of BARs to request and iomap
+ * @name: Name used when requesting regions
+ *
+ * Request and iomap regions specified by @mask.
+ */
+int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
+{
+	void __iomem * const *iomap;
+	int i, rc;
+
+	iomap = pcim_iomap_table(pdev);
+	if (!iomap)
+		return -ENOMEM;
+
+	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+		unsigned long len;
+
+		if (!(mask & (1 << i)))
+			continue;
+
+		rc = -EINVAL;
+		len = pci_resource_len(pdev, i);
+		if (!len)
+			goto err_inval;
+
+		rc = pci_request_region(pdev, i, name);
+		if (rc)
+			goto err_region;
+
+		rc = -ENOMEM;
+		if (!pcim_iomap(pdev, i, 0))
+			goto err_iomap;
+	}
+
+	return 0;
+
+ err_iomap:
+	pcim_iounmap(pdev, iomap[i]);
+ err_region:
+	pci_release_region(pdev, i);
+ err_inval:
+	while (--i >= 0) {
+		pcim_iounmap(pdev, iomap[i]);
+		pci_release_region(pdev, i);
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL(pcim_iomap_regions);
+
static int __devinit pci_init(void)
{
	struct pci_dev *dev = NULL;
diff --git a/include/linux/io.h b/include/linux/io.h
index 9e419eb..c244a0c 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -43,12 +43,6 @@ void __iomem * devm_ioremap_nocache(struct device *dev, unsigned long offset,
				    unsigned long size);
void devm_iounmap(struct device *dev, void __iomem *addr);

-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);
-
/**
 *	check_signature		-	find BIOS signatures
 *	@io_addr: mmio address to check
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 9e3042e..c8f4b84 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -611,6 +611,12 @@ void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
int pci_cfg_space_size(struct pci_dev *dev);
unsigned char pci_bus_max_busnr(struct pci_bus* bus);

+/* PCI managed iomap interface */
+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);
+
/* kmem_cache style wrapper around pci_alloc_consistent() */

#include <linux/dmapool.h>
diff --git a/lib/iomap.c b/lib/iomap.c
index 4990c73..bdf31ba 100644
--- a/lib/iomap.c
+++ b/lib/iomap.c
@@ -228,6 +228,8 @@ void ioport_unmap(void __iomem *addr)
EXPORT_SYMBOL(ioport_map);
EXPORT_SYMBOL(ioport_unmap);

+#ifdef CONFIG_PCI
+
/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
{
@@ -257,6 +259,7 @@ void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
EXPORT_SYMBOL(pci_iomap);
EXPORT_SYMBOL(pci_iounmap);

+#endif /* CONFIG_PCI */
#endif /* CONFIG_GENERIC_IOMAP */

/*
@@ -399,155 +402,3 @@ void devm_iounmap(struct device *dev, void __iomem *addr)
			       (void *)addr));
}
EXPORT_SYMBOL(devm_iounmap);
-
-/*
- * PCI iomap devres
- */
-#define PCIM_IOMAP_MAX	PCI_ROM_RESOURCE
-
-struct pcim_iomap_devres {
-	void __iomem *table[PCIM_IOMAP_MAX];
-};
-
-static void pcim_iomap_release(struct device *gendev, void *res)
-{
-	struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
-	struct pcim_iomap_devres *this = res;
-	int i;
-
-	for (i = 0; i < PCIM_IOMAP_MAX; i++)
-		if (this->table[i])
-			pci_iounmap(dev, this->table[i]);
-}
-
-/**
- * pcim_iomap_table - access iomap allocation table
- * @pdev: PCI device to access iomap table for
- *
- * Access iomap allocation table for @dev.  If iomap table doesn't
- * exist and @pdev is managed, it will be allocated.  All iomaps
- * recorded in the iomap table are automatically unmapped on driver
- * detach.
- *
- * This function might sleep when the table is first allocated but can
- * be safely called without context and guaranteed to succed once
- * allocated.
- */
-void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
-{
-	struct pcim_iomap_devres *dr, *new_dr;
-
-	dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
-	if (dr)
-		return dr->table;
-
-	new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
-	if (!new_dr)
-		return NULL;
-	dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
-	return dr->table;
-}
-EXPORT_SYMBOL(pcim_iomap_table);
-
-/**
- * pcim_iomap - Managed pcim_iomap()
- * @pdev: PCI device to iomap for
- * @bar: BAR to iomap
- * @maxlen: Maximum length of iomap
- *
- * Managed pci_iomap().  Map is automatically unmapped on driver
- * detach.
- */
-void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
-{
-	void __iomem **tbl;
-
-	BUG_ON(bar >= PCIM_IOMAP_MAX);
-
-	tbl = (void __iomem **)pcim_iomap_table(pdev);
-	if (!tbl || tbl[bar])	/* duplicate mappings not allowed */
-		return NULL;
-
-	tbl[bar] = pci_iomap(pdev, bar, maxlen);
-	return tbl[bar];
-}
-EXPORT_SYMBOL(pcim_iomap);
-
-/**
- * pcim_iounmap - Managed pci_iounmap()
- * @pdev: PCI device to iounmap for
- * @addr: Address to unmap
- *
- * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
- */
-void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
-{
-	void __iomem **tbl;
-	int i;
-
-	pci_iounmap(pdev, addr);
-
-	tbl = (void __iomem **)pcim_iomap_table(pdev);
-	BUG_ON(!tbl);
-
-	for (i = 0; i < PCIM_IOMAP_MAX; i++)
-		if (tbl[i] == addr) {
-			tbl[i] = NULL;
-			return;
-		}
-	WARN_ON(1);
-}
-EXPORT_SYMBOL(pcim_iounmap);
-
-/**
- * pcim_iomap_regions - Request and iomap PCI BARs
- * @pdev: PCI device to map IO resources for
- * @mask: Mask of BARs to request and iomap
- * @name: Name used when requesting regions
- *
- * Request and iomap regions specified by @mask.
- */
-int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
-{
-	void __iomem * const *iomap;
-	int i, rc;
-
-	iomap = pcim_iomap_table(pdev);
-	if (!iomap)
-		return -ENOMEM;
-
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-		unsigned long len;
-
-		if (!(mask & (1 << i)))
-			continue;
-
-		rc = -EINVAL;
-		len = pci_resource_len(pdev, i);
-		if (!len)
-			goto err_inval;
-
-		rc = pci_request_region(pdev, i, name);
-		if (rc)
-			goto err_region;
-
-		rc = -ENOMEM;
-		if (!pcim_iomap(pdev, i, 0))
-			goto err_iomap;
-	}
-
-	return 0;
-
- err_iomap:
-	pcim_iounmap(pdev, iomap[i]);
- err_region:
-	pci_release_region(pdev, i);
- err_inval:
-	while (--i >= 0) {
-		pcim_iounmap(pdev, iomap[i]);
-		pci_release_region(pdev, i);
-	}
-
-	return rc;
-}
-EXPORT_SYMBOL(pcim_iomap_regions);
-
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