linux-kernel - [PATCH] devres: implement pcim_iomap_regions_request

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Message-ID: <47D6643A.6060001@gmail.com>
Date:	Tue, 11 Mar 2008 19:51:38 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Jeff Garzik <jeff@...zik.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Jeff Garzik <jeff@...zik.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: [PATCH] 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@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...e.de>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Jeff Garzik <jeff@...zik.org>
---
After acked, it's probably best to push this through libata-dev as
that's the only user for now.

Thanks.

 lib/devres.c |   25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

Index: work/lib/devres.c
===================================================================
--- work.orig/lib/devres.c
+++ work/lib/devres.c
@@ -298,6 +298,31 @@ int pcim_iomap_regions(struct pci_dev *p
 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
--
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