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SubjectRe: [PATCH] uio: Support 36-bit physical addresses on 32-bit systems
On Wed, Oct 12, 2011 at 09:35:45AM -0500, Kumar Gala wrote:
> From: Kai Jiang <Kai.Jiang@freescale.com>
>
> To support >32-bit physical addresses for UIO_MEM_PHYS type we need to
> extend the width of 'addr' in struct uio_mem. Numerous platforms like
> embedded PPC, ARM, and X86 have support for systems with larger physical
> address than logical.
>
> Since 'addr' may contain a physical, logical, or virtual address the
> easiest solution is to just change the type to 'unsigned long long'
> regardless of which type is utilized.

No. There's phys_addr_t for that purpose, defined in include/linux/types.h.
Please use that.

Thanks,
Hans

>
> For physical address we can support up to a 44-bit physical address on a
> typical 32-bit system as we utilize remap_pfn_range() for the mapping of
> the memory region and pfn's are represnted by shifting the address by
> the page size (typically 4k).
>
> Signed-off-by: Kai Jiang <Kai.Jiang@freescale.com>
> Signed-off-by: Minghuan Lian <Minghuan.Lian@freescale.com>
> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
> ---
> drivers/uio/uio.c | 8 ++++----
> include/linux/uio_driver.h | 2 +-
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
> index d2efe82..a927c51 100644
> --- a/drivers/uio/uio.c
> +++ b/drivers/uio/uio.c
> @@ -69,7 +69,7 @@ static ssize_t map_name_show(struct uio_mem *mem, char *buf)
>
> static ssize_t map_addr_show(struct uio_mem *mem, char *buf)
> {
> - return sprintf(buf, "0x%lx\n", mem->addr);
> + return sprintf(buf, "0x%llx\n", mem->addr);
> }
>
> static ssize_t map_size_show(struct uio_mem *mem, char *buf)
> @@ -79,7 +79,7 @@ static ssize_t map_size_show(struct uio_mem *mem, char *buf)
>
> static ssize_t map_offset_show(struct uio_mem *mem, char *buf)
> {
> - return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK);
> + return sprintf(buf, "0x%llx\n", mem->addr & ~PAGE_MASK);
> }
>
> struct map_sysfs_entry {
> @@ -634,8 +634,8 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
> if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL)
> page = virt_to_page(idev->info->mem[mi].addr + offset);
> else
> - page = vmalloc_to_page((void *)idev->info->mem[mi].addr
> - + offset);
> + page = vmalloc_to_page((void *)(unsigned long)
> + idev->info->mem[mi].addr + offset);
> get_page(page);
> vmf->page = page;
> return 0;
> diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
> index 665517c..c1fdb19 100644
> --- a/include/linux/uio_driver.h
> +++ b/include/linux/uio_driver.h
> @@ -31,7 +31,7 @@ struct uio_map;
> */
> struct uio_mem {
> const char *name;
> - unsigned long addr;
> + unsigned long long addr;
> unsigned long size;
> int memtype;
> void __iomem *internal_addr;
> --
> 1.7.3.4
>
>


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