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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-05-17 15:09:59 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-05-17 15:38:04 +0300 |
| commit | 0ce81788080570e28efb43a4036976854e0edca8 (patch) | |
| tree | 8d5a3959bb07ba3e6dd73dffe20d5038b34cf8f6 /drivers/gpu/drm/i915/i915_utils.h | |
| parent | 991bfc64db096cb924d5d216a9cb469590f00428 (diff) | |
| download | linux-0ce81788080570e28efb43a4036976854e0edca8.tar.xz | |
drm/i915: Redefine ptr_pack_bits() and friends
Rebrand the current (pointer | bits) pack/unpack utility macros as
explicit bit twiddling for PAGE_SIZE so that we can use the more
flexible underlying macros for different bits.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170517121007.27224-4-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_utils.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_utils.h | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h index 18630d8f4be8..d9df23795f9a 100644 --- a/drivers/gpu/drm/i915/i915_utils.h +++ b/drivers/gpu/drm/i915/i915_utils.h @@ -70,20 +70,27 @@ #define overflows_type(x, T) \ (sizeof(x) > sizeof(T) && (x) >> (sizeof(T) * BITS_PER_BYTE)) -#define ptr_mask_bits(ptr) ({ \ +#define ptr_mask_bits(ptr, n) ({ \ unsigned long __v = (unsigned long)(ptr); \ - (typeof(ptr))(__v & PAGE_MASK); \ + (typeof(ptr))(__v & -BIT(n)); \ }) -#define ptr_unpack_bits(ptr, bits) ({ \ +#define ptr_unmask_bits(ptr, n) ((unsigned long)(ptr) & (BIT(n) - 1)) + +#define ptr_unpack_bits(ptr, bits, n) ({ \ unsigned long __v = (unsigned long)(ptr); \ - *(bits) = __v & ~PAGE_MASK; \ - (typeof(ptr))(__v & PAGE_MASK); \ + *(bits) = __v & (BIT(n) - 1); \ + (typeof(ptr))(__v & -BIT(n)); \ }) -#define ptr_pack_bits(ptr, bits) \ +#define ptr_pack_bits(ptr, bits, n) \ ((typeof(ptr))((unsigned long)(ptr) | (bits))) +#define page_mask_bits(ptr) ptr_mask_bits(ptr, PAGE_SHIFT) +#define page_unmask_bits(ptr) ptr_unmask_bits(ptr, PAGE_SHIFT) +#define page_pack_bits(ptr, bits) ptr_pack_bits(ptr, bits, PAGE_SHIFT) +#define page_unpack_bits(ptr, bits) ptr_unpack_bits(ptr, bits, PAGE_SHIFT) + #define ptr_offset(ptr, member) offsetof(typeof(*(ptr)), member) #define fetch_and_zero(ptr) ({ \ |