Previouly drivers have their own way of mapping range of
kernel pages/memory into user vma and this was done by
invoking vm_insert_page() within a loop.
As this pattern is common across different drivers, it can
be generalized by creating a new function and use it across
the drivers.
vm_insert_range is the new API which will be used to map a
range of kernel memory/pages to user vma.
All the applicable places are converted to use new vm_insert_range
in this patch series.
v1 -> v2:
Address review comment on mm/memory.c. Add EXPORT_SYMBOL
for vm_insert_range and corrected the documentation part
for this API.
In drivers/gpu/drm/xen/xen_drm_front_gem.c, replace err
with ret as suggested.
In drivers/iommu/dma-iommu.c, handle the scenario of partial
mmap() of large buffer by passing *pages + vma->vm_pgoff* to
vm_insert_range().
v2 -> v3:
Declaration of vm_insert_range() moved to include/linux/mm.h
v3 -> v4:
Address review comments.
In mm/memory.c. Added error check.
In arch/arm/mm/dma-mapping.c, remove part of error check as the
similar is checked inside vm_insert_range.
In rockchip/rockchip_drm_gem.c, vma->vm_pgoff is respected as
this might be passed as non zero value considering partial
mapping of large buffer.
In iommu/dma-iommu.c, count is modifed as (count - vma->vm_pgoff)
to handle partial mapping scenario in v2.
Souptick Joarder (9):
mm: Introduce new vm_insert_range API
arch/arm/mm/dma-mapping.c: Convert to use vm_insert_range
drivers/firewire/core-iso.c: Convert to use vm_insert_range
drm/rockchip/rockchip_drm_gem.c: Convert to use vm_insert_range
drm/xen/xen_drm_front_gem.c: Convert to use vm_insert_range
iommu/dma-iommu.c: Convert to use vm_insert_range
videobuf2/videobuf2-dma-sg.c: Convert to use vm_insert_range
xen/gntdev.c: Convert to use vm_insert_range
xen/privcmd-buf.c: Convert to use vm_insert_range
arch/arm/mm/dma-mapping.c | 21 ++++--------
drivers/firewire/core-iso.c | 15 ++-------
drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 19 ++---------
drivers/gpu/drm/xen/xen_drm_front_gem.c | 20 ++++-------
drivers/iommu/dma-iommu.c | 13 ++-----
drivers/media/common/videobuf2/videobuf2-dma-sg.c | 23 ++++---------
drivers/xen/gntdev.c | 11 +++---
drivers/xen/privcmd-buf.c | 8 ++---
include/linux/mm.h | 2 ++
mm/memory.c | 41 +++++++++++++++++++++++
mm/nommu.c | 7 ++++
11 files changed, 83 insertions(+), 97 deletions(-)
--
1.9.1
