linux-kernel - [PATCH v1 4/4] sparc/PCI: Implement pci_resource_to_user() with pcibios_resource_to

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Date:	Fri, 17 Jun 2016 15:12:18 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Michal Simek <monstr@...str.eu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Yinghai Lu <yinghai@...nel.org>,
	"David S. Miller" <davem@...emloft.net>
Cc:	sparclinux@...r.kernel.org, linux-mips@...ux-mips.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: [PATCH v1 4/4] sparc/PCI: Implement pci_resource_to_user() with
 pcibios_resource_to_bus()

"User" addresses are shown in /sys/devices/pci.../.../resource and
/proc/bus/pci/devices and used as mmap offsets for /proc/bus/pci/BB/DD.F
files.  On sparc, these are PCI bus addresses, i.e., raw BAR values.

Previously pci_resource_to_user() computed the user address by
subtracting either pbm->io_space.start or pbm->mem_space.start from the
resource start.

We've already told the PCI core about those offsets here:

  pci_scan_one_pbm()
    pci_add_resource_offset(&resources, &pbm->io_space, pbm->io_space.start);
    pci_add_resource_offset(&resources, &pbm->mem_space, pbm->mem_space.start);
    pci_add_resource_offset(&resources, &pbm->mem64_space, pbm->mem_space.start);

so pcibios_resource_to_bus() knows how to do that translation.

No functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/sparc/kernel/pci.c |   20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index c2b202d..9c1878f 100644
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -986,16 +986,18 @@ void pci_resource_to_user(const struct pci_dev *pdev, int bar,
 			  const struct resource *rp, resource_size_t *start,
 			  resource_size_t *end)
 {
-	struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
-	unsigned long offset;
-
-	if (rp->flags & IORESOURCE_IO)
-		offset = pbm->io_space.start;
-	else
-		offset = pbm->mem_space.start;
+	struct pci_bus_region region;
 
-	*start = rp->start - offset;
-	*end = rp->end - offset;
+	/*
+	 * "User" addresses are shown in /sys/devices/pci.../.../resource
+	 * and /proc/bus/pci/devices and used as mmap offsets for
+	 * /proc/bus/pci/BB/DD.F files (see proc_bus_pci_mmap()).
+	 *
+	 * On sparc, these are PCI bus addresses, i.e., raw BAR values.
+	 */
+	pcibios_resource_to_bus(pdev->bus, &region, (struct resource *) rp);
+	*start = region.start;
+	*end = region.end;
 }
 
 void pcibios_set_master(struct pci_dev *dev)