forked from luck/tmp_suning_uos_patched
a66022c457
Use bitmap library and kill some unused iommu helper functions. 1. s/iommu_area_free/bitmap_clear/ 2. s/iommu_area_reserve/bitmap_set/ 3. Use bitmap_find_next_zero_area instead of find_next_zero_area This cannot be simple substitution because find_next_zero_area doesn't check the last bit of the limit in bitmap 4. Remove iommu_area_free, iommu_area_reserve, and find_next_zero_area Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
|
|
* IOMMU helper functions for the free area management
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/bitmap.h>
|
|
|
|
int iommu_is_span_boundary(unsigned int index, unsigned int nr,
|
|
unsigned long shift,
|
|
unsigned long boundary_size)
|
|
{
|
|
BUG_ON(!is_power_of_2(boundary_size));
|
|
|
|
shift = (shift + index) & (boundary_size - 1);
|
|
return shift + nr > boundary_size;
|
|
}
|
|
|
|
unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
|
|
unsigned long start, unsigned int nr,
|
|
unsigned long shift, unsigned long boundary_size,
|
|
unsigned long align_mask)
|
|
{
|
|
unsigned long index;
|
|
|
|
/* We don't want the last of the limit */
|
|
size -= 1;
|
|
again:
|
|
index = bitmap_find_next_zero_area(map, size, start, nr, align_mask);
|
|
if (index < size) {
|
|
if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
|
|
/* we could do more effectively */
|
|
start = index + 1;
|
|
goto again;
|
|
}
|
|
bitmap_set(map, index, nr);
|
|
return index;
|
|
}
|
|
return -1;
|
|
}
|
|
EXPORT_SYMBOL(iommu_area_alloc);
|
|
|
|
unsigned long iommu_num_pages(unsigned long addr, unsigned long len,
|
|
unsigned long io_page_size)
|
|
{
|
|
unsigned long size = (addr & (io_page_size - 1)) + len;
|
|
|
|
return DIV_ROUND_UP(size, io_page_size);
|
|
}
|
|
EXPORT_SYMBOL(iommu_num_pages);
|