Big update:

Adapt for new functions in the 2.6.19 kernel.
Remove the ability to have multiple regions in one TTM.
   This simplifies a lot of code.
Remove the ability to access TTMs from user space.
   We don't need it anymore without ttm regions.
Don't change caching policy for evicted buffers. Instead change it only
   when the buffer is accessed by the CPU (on the first page fault).
   This tremendously speeds up eviction rates.
Current code is safe for kernels <= 2.6.14.
Should also be OK with 2.6.19 and above.

1 files changed, 46 insertions, 4 deletions

diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c
index 2b449e90..1aa835ca 100644
--- a/linux-core/drm_compat.c
+++ b/linux-core/drm_compat.c
@@ -63,8 +63,10 @@ pgprot_t vm_get_page_prot(unsigned long vm_flags)
 #endif
 };
 
-int drm_pte_is_clear(struct vm_area_struct *vma,
-		     unsigned long addr)
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+
+static int drm_pte_is_clear(struct vm_area_struct *vma,
+			    unsigned long addr)
 {
 	struct mm_struct *mm = vma->vm_mm;
 	int ret = 1;
@@ -77,7 +79,7 @@ int drm_pte_is_clear(struct vm_area_struct *vma,
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
 	spin_lock(&mm->page_table_lock);
 #else
-	spinlock_t ptl;
+	spinlock_t *ptl;
 #endif
 	
 	pgd = pgd_offset(mm, addr);
@@ -92,7 +94,7 @@ int drm_pte_is_clear(struct vm_area_struct *vma,
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
 	pte = pte_offset_map(pmd, addr);
 #else 
-	pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
+	pte = pte_offset_map_lock(mm, pmd, addr, &ptl); 
 #endif
 	if (!pte)
 		goto unlock;
@@ -108,6 +110,17 @@ int drm_pte_is_clear(struct vm_area_struct *vma,
 	return ret;
 }
 	
+int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, 
+		  unsigned long pfn, pgprot_t pgprot)
+{
+	int ret;
+	if (!drm_pte_is_clear(vma, addr))
+		return -EBUSY;
+
+	ret = io_remap_pfn_range(vma, addr, pfn, PAGE_SIZE, pgprot);
+	return ret;
+}
+
 
 static struct {
 	spinlock_t lock;
@@ -141,3 +154,32 @@ void free_nopage_retry(void)
 		spin_unlock(&drm_np_retry.lock);
 	}
 }
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
+
+struct page *drm_vm_ttm_nopage(struct vm_area_struct *vma,
+			       unsigned long address, 
+			       int *type)
+{
+	struct fault_data data;
+
+	if (type)
+		*type = VM_FAULT_MINOR;
+
+	data.address = address;
+	data.vma = vma;
+	drm_vm_ttm_fault(vma, &data);
+	switch (data.type) {
+	case VM_FAULT_OOM:
+		return NOPAGE_OOM;
+	case VM_FAULT_SIGBUS:
+		return NOPAGE_SIGBUS;
+	default:
+		break;
+	}
+
+	return NOPAGE_REFAULT;
+}
+
+#endif