Forward port of pci-mmap-conflict.patch to x86 tree.
Signed-off-by: Venkatesh Pallipadi <[EMAIL PROTECTED]>
Signed-off-by: Suresh Siddha <[EMAIL PROTECTED]>
Index: linux-2.6.git/arch/x86/pci/i386.c
===================================================================
--- linux-2.6.git.orig/arch/x86/pci/i386.c 2008-01-08 04:30:53.000000000
-0800
+++ linux-2.6.git/arch/x86/pci/i386.c 2008-01-08 05:15:09.000000000 -0800
@@ -30,6 +30,8 @@
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/errno.h>
+#include <asm/pat.h>
+#include <asm/cacheflush.h>
#include "pci.h"
@@ -297,10 +299,37 @@
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}
+static void pci_unmap_page_range(struct vm_area_struct *vma)
+{
+ u64 adr = (u64)vma->vm_pgoff << PAGE_SHIFT;
+ unsigned long flags = pgprot_val(vma->vm_page_prot)
+ & _PAGE_CACHE_MASK;
+ free_mattr(adr, adr + vma->vm_end - vma->vm_start, flags);
+}
+
+static void pci_track_mmap_page_range(struct vm_area_struct *vma)
+{
+ u64 adr = (u64)vma->vm_pgoff << PAGE_SHIFT;
+ unsigned long flags = pgprot_val(vma->vm_page_prot)
+ & _PAGE_CACHE_MASK;
+
+ reserve_mattr(adr, adr + vma->vm_end - vma->vm_start, flags, NULL);
+}
+
+static struct vm_operations_struct pci_mmap_ops = {
+ .open = pci_track_mmap_page_range,
+ .close = pci_unmap_page_range
+};
+
int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
unsigned long prot;
+ u64 addr = vma->vm_pgoff << PAGE_SHIFT;
+ unsigned long len = vma->vm_end - vma->vm_start;
+ unsigned long attr;
+ int err;
+
/* I/O space cannot be accessed via normal processor loads and
* stores on this platform.
*/
@@ -329,10 +358,25 @@
vma->vm_page_prot = __pgprot(prot);
}
+ attr = pgprot_val(vma->vm_page_prot) & _PAGE_CACHE_MASK;
+ err = reserve_mattr(addr, addr+len, attr, NULL);
+ if (err)
+ return -EBUSY;
+
+ err = change_page_attr_addr((unsigned long)__va(addr),
+ len >> PAGE_SHIFT,
+ __pgprot(__PAGE_KERNEL | attr));
+ if (err) {
+ free_mattr(addr, addr+len, attr);
+ return err;
+ }
+
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;
}
--
--
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