From 0ce81788080570e28efb43a4036976854e0edca8 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 17 May 2017 13:09:59 +0100 Subject: [PATCH] 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 Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/20170517121007.27224-4-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_cmd_parser.c | 2 +- drivers/gpu/drm/i915/i915_gem.c | 6 +++--- drivers/gpu/drm/i915/i915_utils.h | 19 +++++++++++++------ 3 files changed, 17 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c index 2a1a334..f0cb22c 100644 --- a/drivers/gpu/drm/i915/i915_cmd_parser.c +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c @@ -1284,7 +1284,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, if (*cmd == MI_BATCH_BUFFER_END) { if (needs_clflush_after) { - void *ptr = ptr_mask_bits(shadow_batch_obj->mm.mapping); + void *ptr = page_mask_bits(shadow_batch_obj->mm.mapping); drm_clflush_virt_range(ptr, (void *)(cmd + 1) - ptr); } diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 5d68bec..b63c3d1 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2280,7 +2280,7 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj, if (obj->mm.mapping) { void *ptr; - ptr = ptr_mask_bits(obj->mm.mapping); + ptr = page_mask_bits(obj->mm.mapping); if (is_vmalloc_addr(ptr)) vunmap(ptr); else @@ -2612,7 +2612,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, } GEM_BUG_ON(!obj->mm.pages); - ptr = ptr_unpack_bits(obj->mm.mapping, &has_type); + ptr = page_unpack_bits(obj->mm.mapping, &has_type); if (ptr && has_type != type) { if (pinned) { ret = -EBUSY; @@ -2634,7 +2634,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj, goto err_unpin; } - obj->mm.mapping = ptr_pack_bits(ptr, type); + obj->mm.mapping = page_pack_bits(ptr, type); } out_unlock: diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h index 18630d8..d9df237 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) ({ \ -- 2.7.4