Hi Jan,
I have just commited a modification of the nucleus heap which allows
faulting newly mapped pages. However, I noticed that we should modify
rtdm_mmap_to_user as in the attached patch.
At this chance, I also noticed that there is no way to ask for uncached
memory to rtdm_mmap_to_user, how do you think we should change
rtdm_mmap_to_user to allow this?
Regards.
Index: ksrc/skins/rtdm/drvlib.c
===================================================================
--- ksrc/skins/rtdm/drvlib.c (revision 4390)
+++ ksrc/skins/rtdm/drvlib.c (working copy)
@@ -1781,6 +1781,7 @@ static int rtdm_mmap_buffer(struct file
{
struct rtdm_mmap_data *mmap_data = filp->private_data;
unsigned long vaddr, paddr, maddr, size;
+ int ret;
vma->vm_ops = mmap_data->vm_ops;
vma->vm_private_data = mmap_data->vm_private_data;
@@ -1810,15 +1811,25 @@ static int rtdm_mmap_buffer(struct file
vaddr += PAGE_SIZE;
mapped_size += PAGE_SIZE;
}
- return 0;
+#ifdef xnarch_fault_range
+ xnarch_fault_range(vma);
+#endif /* xnarch_fault_range */
+ ret = 0;
} else
#endif /* CONFIG_MMU */
if (mmap_data->src_paddr)
- return xnarch_remap_io_page_range(filp, vma, maddr, paddr,
- size, PAGE_SHARED);
- else
- return xnarch_remap_kmem_page_range(vma, maddr, paddr,
- size, PAGE_SHARED);
+ ret = xnarch_remap_io_page_range(filp, vma, maddr, paddr,
+ size, PAGE_SHARED);
+ else {
+ ret = xnarch_remap_kmem_page_range(vma, maddr, paddr,
+ size, PAGE_SHARED);
+#ifdef xnarch_fault_range
+ if (!ret)
+ xnarch_fault_range(vma);
+#endif /* xnarch_fault_range */
+ }
+
+ return ret;
}
static struct file_operations rtdm_mmap_fops = {
--
Gilles.
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