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From: Dmitriy Tochansky <toch@dfpost.ru>
To: Dan Malek <dan@embeddededge.com>
Cc: linux-mips@linux-mips.org
Subject: Re: mmap problem
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On Tue, 7 Dec 2004 10:57:20 -0500
Dan Malek <dan@embeddededge.com> wrote:

> >   ret = remap_page_range( start, 0x40000000, size, vma->vm_page_prot
> >   
> > ); //
> 
> Use io_remap_page_range, it has the same parameters, and is
> designed to work with > 32-bit physical addresses.
  Well, I test it. On module load - unresolved symbol remap_page_range_high. I looking for some ifdefs
where this function blocked, but seems like everithing is ok. :(

> 
> Also, you should really use pci_resource_* functions to get
> information about the pci address, size, etc.  Don't hardcode this,
> even for testing.

There is a new variant. If I by hand make io_remap_page_range visible - system hangs. :(
  

#define MAX_DEV 4

struct pci_dev *devs[MAX_DEV];
struct pci_dev *dev = NULL;

...

static unsigned long *offset;

static int mdrv_mmap(struct file * file, struct vm_area_struct *vma)                                   
{                                                                                                      
                                                                                                       
 int ret;                                                                                              
 struct inode *inode;                                                                                  
 inode = file->f_dentry->d_inode;                                                                      
 
 ret = -EINVAL;                                                                                        
 unsigned long start = vma->vm_start;                                                                  
 unsigned long size = (vma->vm_end-vma->vm_start);                                                     
 
 struct pci_dev *curdev = NULL;
 
 int minor = MINOR(inode->i_rdev);
 
 printk("minor = %d\n",minor);
 
 curdev = (devs[minor]);
 
 offset = (unsigned long *)pci_resource_start(curdev,0);
 
 printk("offset = 0x%X\n", offset );

 ret = io_remap_page_range( start, offset, size, vma->vm_page_prot );

 return ret;                                                               
}