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x86/PCI: Use generic pci_mmap_resource_range()

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Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
David Woodhouse 2017-04-12 13:26:07 +01:00 • committed by Bjorn Helgaas
parent 69c701ec1f
commit 5c2d5ce2ab
2 changed files with 1 additions and 48 deletions
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1
arch/x86/include/asm/pci.h
View file

@ -104,6 +104,7 @@ int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
#define HAVE_PCI_MMAP #define HAVE_PCI_MMAP
#define arch_can_pci_mmap_wc() pat_enabled() #define arch_can_pci_mmap_wc() pat_enabled()
#define ARCH_GENERIC_PCI_MMAP_RESOURCE
#ifdef CONFIG_PCI #ifdef CONFIG_PCI
extern void early_quirks(void); extern void early_quirks(void);

48
arch/x86/pci/i386.c
View file

@ -406,51 +406,3 @@ void __init pcibios_resource_survey(void)
*/ */
ioapic_insert_resources(); ioapic_insert_resources();
} }
static const struct vm_operations_struct pci_mmap_ops = {
.access = generic_access_phys,
};
int pci_mmap_page_range(struct pci_dev *dev, int bar,
struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
unsigned long prot;
/* I/O space cannot be accessed via normal processor loads and
* stores on this platform.
*/
if (mmap_state == pci_mmap_io)
return -EINVAL;
prot = pgprot_val(vma->vm_page_prot);
/*
* Return error if pat is not enabled and write_combine is requested.
* Caller can followup with UC MINUS request and add a WC mtrr if there
* is a free mtrr slot.
*/
if (!pat_enabled() && write_combine)
return -EINVAL;
if (pat_enabled() && write_combine)
prot |= cachemode2protval(_PAGE_CACHE_MODE_WC);
else if (pat_enabled() || boot_cpu_data.x86 > 3)
/*
* ioremap() and ioremap_nocache() defaults to UC MINUS for now.
* To avoid attribute conflicts, request UC MINUS here
* as well.
*/
prot |= cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS);
vma->vm_page_prot = __pgprot(prot);
if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot))
return -EAGAIN;
vma->vm_ops = &pci_mmap_ops;
return 0;
}