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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@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
This commit is contained in:
Bjorn Helgaas 2016-06-17 14:43:34 -05:00
parent 3830135857
commit 3b146b24a4
1 changed files with 11 additions and 9 deletions
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20
arch/sparc/kernel/pci.c
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@ -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;
struct pci_bus_region region;
if (rp->flags & IORESOURCE_IO)
offset = pbm->io_space.start;
else
offset = pbm->mem_space.start;
*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)