gpu: nvgpu: Split vm_area management into vm code

The vm_reserve_va_node struct is essentially a special VM area that
can be used for sparse mappings and fixed mappings. The name of this
struct is somewhat confusing (as node is typically used for list
items). Though this struct is a part of a list it doesn't really
make sense to call this a list item since it's much more. Based on
that the struct has been renamed to nvgpu_vm_area to capture the
actual use of the struct more accurately.

This also moves all of the management code of vm areas to a new file
devoted solely to vm_area management.

Also add a brief overview of the VM architecture. This should help
other people follow along the hierachy of ownership and lifetimes in
the rather complex MM code.

JIRA NVGPU-12
JIRA NVGPU-30

Change-Id: If85e1cf868031d0dc265e7bed50b58a2aed2602e
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1477744
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 20 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index 357962c7..6ddf842a 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -140,22 +140,6 @@ struct priv_cmd_entry {
         u32 size;       /* in words */
 };
 
-struct vm_reserved_va_node {
-        struct nvgpu_list_node reserved_va_list;
-        struct nvgpu_list_node buffer_list_head;
-        u32 pgsz_idx;
-        u64 vaddr_start;
-        u64 size;
-        bool sparse;
-};
-
-static inline struct vm_reserved_va_node *
-vm_reserved_va_node_from_reserved_va_list(struct nvgpu_list_node *node)
-{
-        return (struct vm_reserved_va_node *)
-                ((uintptr_t)node - offsetof(struct vm_reserved_va_node, reserved_va_list));
-};
-
 struct gk20a;
 struct channel_gk20a;
 
@@ -442,10 +426,6 @@ struct nvgpu_as_free_space_args;
 int gk20a_vm_alloc_share(struct gk20a_as_share *as_share, u32 big_page_size,
                          u32 flags);
 int gk20a_vm_release_share(struct gk20a_as_share *as_share);
-int gk20a_vm_alloc_space(struct gk20a_as_share *as_share,
-                         struct nvgpu_as_alloc_space_args *args);
-int gk20a_vm_free_space(struct gk20a_as_share *as_share,
-                        struct nvgpu_as_free_space_args *args);
 int gk20a_vm_bind_channel(struct gk20a_as_share *as_share,
                           struct channel_gk20a *ch);
 int __gk20a_vm_bind_channel(struct vm_gk20a *vm, struct channel_gk20a *ch);
@@ -491,5 +471,6 @@ extern const struct gk20a_mmu_level gk20a_mm_levels_128k[];
 
 int gk20a_mm_get_buffer_info(struct device *dev, int dmabuf_fd,
                              u64 *buffer_id, u64 *buffer_len);
+void gk20a_vm_unmap_locked_kref(struct kref *ref);
 
 #endif /* MM_GK20A_H */