On Mon, Dec 3, 2018 at 11:52 AM Mike Rapoport rppt@linux.ibm.com wrote:
On Mon, Dec 03, 2018 at 09:51:45AM +0530, Souptick Joarder wrote:
Hi Mike,
On Sun, Dec 2, 2018 at 4:43 PM Mike Rapoport rppt@linux.ibm.com wrote:
On Sun, Dec 02, 2018 at 11:49:44AM +0530, Souptick Joarder wrote:
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.
This API is tested by Heiko for Rockchip drm driver, on rk3188, rk3288, rk3328 and rk3399 with graphics.
Signed-off-by: Souptick Joarder jrdr.linux@gmail.com Reviewed-by: Matthew Wilcox willy@infradead.org Tested-by: Heiko Stuebner heiko@sntech.de
include/linux/mm_types.h | 3 +++ mm/memory.c | 38 ++++++++++++++++++++++++++++++++++++++ mm/nommu.c | 7 +++++++ 3 files changed, 48 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 5ed8f62..15ae24f 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -523,6 +523,9 @@ extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, extern void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end);
+int vm_insert_range(struct vm_area_struct *vma, unsigned long addr,
struct page **pages, unsigned long page_count);This seem to belong to include/linux/mm.h, near vm_insert_page()
Ok, I will change it. Apart from this change does it looks good ?
With this change you can add
Reviewed-by: Mike Rapoport rppt@linux.ibm.com
Thanks Mike.
static inline void init_tlb_flush_pending(struct mm_struct *mm) { atomic_set(&mm->tlb_flush_pending, 0); diff --git a/mm/memory.c b/mm/memory.c index 15c417e..84ea46c 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1478,6 +1478,44 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr, }
/**
- vm_insert_range - insert range of kernel pages into user vma
- @vma: user vma to map to
- @addr: target user address of this page
- @pages: pointer to array of source kernel pages
- @page_count: number of pages need to insert into user vma
- This allows drivers to insert range of kernel pages they've allocated
- into a user vma. This is a generic function which drivers can use
- rather than using their own way of mapping range of kernel pages into
- user vma.
- If we fail to insert any page into the vma, the function will return
- immediately leaving any previously-inserted pages present. Callers
- from the mmap handler may immediately return the error as their caller
- will destroy the vma, removing any successfully-inserted pages. Other
- callers should make their own arrangements for calling unmap_region().
- Context: Process context. Called by mmap handlers.
- Return: 0 on success and error code otherwise
- */
+int vm_insert_range(struct vm_area_struct *vma, unsigned long addr,
struct page **pages, unsigned long page_count)+{
unsigned long uaddr = addr;int ret = 0, i;for (i = 0; i < page_count; i++) {ret = vm_insert_page(vma, uaddr, pages[i]);if (ret < 0)return ret;uaddr += PAGE_SIZE;}return ret;+} +EXPORT_SYMBOL(vm_insert_range);
+/**
- vm_insert_page - insert single page into user vma
- @vma: user vma to map to
- @addr: target user address of this page
diff --git a/mm/nommu.c b/mm/nommu.c index 749276b..d6ef5c7 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -473,6 +473,13 @@ int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, } EXPORT_SYMBOL(vm_insert_page);
+int vm_insert_range(struct vm_area_struct *vma, unsigned long addr,
struct page **pages, unsigned long page_count)+{
return -EINVAL;+} +EXPORT_SYMBOL(vm_insert_range);
/*
- sys_brk() for the most part doesn't need the global kernel
- lock, except when an application is doing something nasty
-- 1.9.1
-- Sincerely yours, Mike.
-- Sincerely yours, Mike.