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, 2 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/vm_priv.h b/drivers/gpu/nvgpu/common/linux/vm_priv.h
index 9e064d76..14852264 100644
--- a/drivers/gpu/nvgpu/common/linux/vm_priv.h
+++ b/drivers/gpu/nvgpu/common/linux/vm_priv.h
@@ -77,7 +77,7 @@ enum nvgpu_aperture gk20a_dmabuf_aperture(struct gk20a *g,
 int validate_fixed_buffer(struct vm_gk20a *vm,
                           struct buffer_attrs *bfr,
                           u64 map_offset, u64 map_size,
-                          struct vm_reserved_va_node **pva_node);
+                          struct nvgpu_vm_area **pva_node);
 int setup_buffer_kind_and_compression(struct vm_gk20a *vm,
                                       u32 flags,
                                       struct buffer_attrs *bfr,
@@ -89,6 +89,5 @@ int gk20a_alloc_comptags(struct gk20a *g,
                          u32 lines, bool user_mappable,
                          u64 *ctag_map_win_size,
                          u32 *ctag_map_win_ctagline);
-void gk20a_vm_unmap_locked_kref(struct kref *ref);
 
 #endif