From 30703893674b3da5b862dee2acd6efca13424398 Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
Date: Wed, 11 Oct 2006 22:21:01 +0200
Subject: Compatibility code for 2.6.15-2.6.18. It is ugly but a little comfort
 is that it will go away in the mainstream kernel. Some bugfixes, mainly in
 error paths.

---
 linux-core/drm_compat.h | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

(limited to 'linux-core/drm_compat.h')

diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h
index 4e95679d..5617fb7f 100644
--- a/linux-core/drm_compat.h
+++ b/linux-core/drm_compat.h
@@ -231,6 +231,13 @@ static inline int remap_pfn_range(struct vm_area_struct *vma, unsigned long from
 #include <linux/mm.h>
 #include <asm/page.h>
 
+#if ((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)) && \
+     (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))) 
+#define DRM_ODD_MM_COMPAT
+#endif
+
+
+
 /*
  * Flush relevant caches and clear a VMA structure so that page references 
  * will cause a page fault. Don't flush tlbs.
@@ -303,5 +310,66 @@ extern struct page *drm_vm_ttm_nopage(struct vm_area_struct *vma,
 extern struct page *drm_vm_ttm_fault(struct vm_area_struct *vma, 
 				     struct fault_data *data);
 
+#endif
+
+#ifdef DRM_ODD_MM_COMPAT
+
+struct drm_ttm;
+
+
+/*
+ * Add a vma to the ttm vma list, and the 
+ * process mm pointer to the ttm mm list. Needs the ttm mutex.
+ */
+
+extern int drm_ttm_add_vma(struct drm_ttm * ttm, 
+			   struct vm_area_struct *vma);
+/*
+ * Delete a vma and the corresponding mm pointer from the
+ * ttm lists. Needs the ttm mutex.
+ */
+extern void drm_ttm_delete_vma(struct drm_ttm * ttm, 
+			       struct vm_area_struct *vma);
+
+/*
+ * Attempts to lock all relevant mmap_sems for a ttm, while
+ * not releasing the ttm mutex. May return -EAGAIN to avoid 
+ * deadlocks. In that case the caller shall release the ttm mutex,
+ * schedule() and try again.
+ */
+
+extern int drm_ttm_lock_mm(struct drm_ttm * ttm);
+
+/*
+ * Unlock all relevant mmap_sems for a ttm.
+ */
+extern void drm_ttm_unlock_mm(struct drm_ttm * ttm);
+
+/*
+ * If the ttm was bound to the aperture, this function shall be called
+ * with all relevant mmap sems held. It deletes the flag VM_PFNMAP from all
+ * vmas mapping this ttm. This is needed just after unmapping the ptes of
+ * the vma, otherwise the do_nopage() function will bug :(. The function
+ * releases the mmap_sems for this ttm.
+ */
+
+extern void drm_ttm_finish_unmap(struct drm_ttm *ttm);
+
+/*
+ * Remap all vmas of this ttm using io_remap_pfn_range. We cannot 
+ * fault these pfns in, because the first one will set the vma VM_PFNMAP
+ * flag, which will make the next fault bug in do_nopage(). The function
+ * releases the mmap_sems for this ttm.
+ */
+
+extern int drm_ttm_remap_bound(struct drm_ttm *ttm);
+
+
+/*
+ * Remap a vma for a bound ttm. Call with the ttm mutex held and
+ * the relevant mmap_sem locked.
+ */
+extern int drm_ttm_map_bound(struct vm_area_struct *vma);
+
 #endif
 #endif
-- 
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