[PATCH v4 21/38] drm: Promote drm_mm alignment to u64

Chris Wilson
2016-12-22T08:36:24Z

In places (e.g. i915.ko), the alignment is exported to userspace as u64
and there now exists hardware for which we can indeed utilize a u64
alignment. As such, we need to keep 64bit integers throughout when
handling alignment.

Testcase: igt/drm_mm/align64
Testcase: igt/gem_exec_alignment
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/drm_mm.c | 37 +++++++++++++++------------------
drivers/gpu/drm/selftests/test-drm_mm.c | 4 ++--
include/drm/drm_mm.h | 16 +++++++-------
3 files changed, 27 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 9756542abe4c..fd2667052c73 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -93,12 +93,12 @@

static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
enum drm_mm_search_flags flags);
static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
u64 start,
u64 end,
@@ -227,7 +227,7 @@ static void drm_mm_interval_tree_add_node(struct drm_mm_node *hole_node,

static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
struct drm_mm_node *node,
- u64 size, unsigned alignment,
+ u64 size, u64 alignment,
unsigned long color,
enum drm_mm_allocator_flags flags)
{
@@ -246,10 +246,9 @@ static void drm_mm_insert_helper(struct drm_mm_node *hole_node,
adj_start = adj_end - size;

if (alignment) {
- u64 tmp = adj_start;
- unsigned rem;
+ u64 rem;

- rem = do_div(tmp, alignment);
+ div64_u64_rem(adj_start, alignment, &rem);
if (rem) {
if (flags & DRM_MM_CREATE_TOP)
adj_start -= rem;
@@ -376,7 +375,7 @@ EXPORT_SYMBOL(drm_mm_reserve_node);
* 0 on success, -ENOSPC if there's no suitable hole.
*/
int drm_mm_insert_node_generic(struct drm_mm *mm, struct drm_mm_node *node,
- u64 size, unsigned alignment,
+ u64 size, u64 alignment,
unsigned long color,
enum drm_mm_search_flags sflags,
enum drm_mm_allocator_flags aflags)
@@ -398,7 +397,7 @@ EXPORT_SYMBOL(drm_mm_insert_node_generic);

static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
struct drm_mm_node *node,
- u64 size, unsigned alignment,
+ u64 size, u64 alignment,
unsigned long color,
u64 start, u64 end,
enum drm_mm_allocator_flags flags)
@@ -423,10 +422,9 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
adj_start = adj_end - size;

if (alignment) {
- u64 tmp = adj_start;
- unsigned rem;
+ u64 rem;

- rem = do_div(tmp, alignment);
+ div64_u64_rem(adj_start, alignment, &rem);
if (rem) {
if (flags & DRM_MM_CREATE_TOP)
adj_start -= rem;
@@ -482,7 +480,7 @@ static void drm_mm_insert_helper_range(struct drm_mm_node *hole_node,
* 0 on success, -ENOSPC if there's no suitable hole.
*/
int drm_mm_insert_node_in_range_generic(struct drm_mm *mm, struct drm_mm_node *node,
- u64 size, unsigned alignment,
+ u64 size, u64 alignment,
unsigned long color,
u64 start, u64 end,
enum drm_mm_search_flags sflags,
@@ -548,16 +546,15 @@ void drm_mm_remove_node(struct drm_mm_node *node)
}
EXPORT_SYMBOL(drm_mm_remove_node);

-static int check_free_hole(u64 start, u64 end, u64 size, unsigned alignment)
+static int check_free_hole(u64 start, u64 end, u64 size, u64 alignment)
{
if (end - start < size)
return 0;

if (alignment) {
- u64 tmp = start;
- unsigned rem;
+ u64 rem;

- rem = do_div(tmp, alignment);
+ div64_u64_rem(start, alignment, &rem);
if (rem)
start += alignment - rem;
}
@@ -567,7 +564,7 @@ static int check_free_hole(u64 start, u64 end, u64 size, unsigned alignment)

static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
enum drm_mm_search_flags flags)
{
@@ -609,7 +606,7 @@ static struct drm_mm_node *drm_mm_search_free_generic(const struct drm_mm *mm,

static struct drm_mm_node *drm_mm_search_free_in_range_generic(const struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
u64 start,
u64 end,
@@ -729,7 +726,7 @@ EXPORT_SYMBOL(drm_mm_replace_node);
*/
void drm_mm_init_scan(struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color)
{
mm->scan_color = color;
@@ -762,7 +759,7 @@ EXPORT_SYMBOL(drm_mm_init_scan);
*/
void drm_mm_init_scan_with_range(struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
u64 start,
u64 end)
diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c
index fb8f7056225b..e2ed9efb361c 100644
--- a/drivers/gpu/drm/selftests/test-drm_mm.c
+++ b/drivers/gpu/drm/selftests/test-drm_mm.c
@@ -1116,7 +1116,7 @@ static int igt_align64(void *ignored)

static void show_scan(const struct drm_mm *scan)
{
- pr_info("scan: hit [%llx, %llx], size=%lld, align=%d, color=%ld\n",
+ pr_info("scan: hit [%llx, %llx], size=%lld, align=%lld, color=%ld\n",
scan->scan_hit_start, scan->scan_hit_end,
scan->scan_size, scan->scan_alignment, scan->scan_color);
}
@@ -1178,7 +1178,7 @@ static bool evict_nodes(struct drm_mm *mm,
list_del(&e->link);
}
if (list_empty(evict_list)) {
- pr_err("Failed to find eviction: size=%lld [avail=%d], align=%d (color=%lu)\n",
+ pr_err("Failed to find eviction: size=%lld [avail=%d], align=%lld (color=%lu)\n",
mm->scan_size, count,
mm->scan_alignment,
mm->scan_color);
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 525543019896..0ce8c3678c11 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -98,12 +98,12 @@ struct drm_mm {
struct rb_root interval_tree;

unsigned int scan_check_range : 1;
- unsigned scan_alignment;
+ unsigned int scanned_blocks;
unsigned long scan_color;
+ u64 scan_alignment;
u64 scan_size;
u64 scan_hit_start;
u64 scan_hit_end;
- unsigned scanned_blocks;
u64 scan_start;
u64 scan_end;
struct drm_mm_node *prev_scanned_node;
@@ -261,7 +261,7 @@ int drm_mm_reserve_node(struct drm_mm *mm, struct drm_mm_node *node);
int drm_mm_insert_node_generic(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
enum drm_mm_search_flags sflags,
enum drm_mm_allocator_flags aflags);
@@ -284,7 +284,7 @@ int drm_mm_insert_node_generic(struct drm_mm *mm,
static inline int drm_mm_insert_node(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
- unsigned alignment,
+ u64 alignment,
enum drm_mm_search_flags flags)
{
return drm_mm_insert_node_generic(mm, node, size, alignment, 0, flags,
@@ -294,7 +294,7 @@ static inline int drm_mm_insert_node(struct drm_mm *mm,
int drm_mm_insert_node_in_range_generic(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
u64 start,
u64 end,
@@ -321,7 +321,7 @@ int drm_mm_insert_node_in_range_generic(struct drm_mm *mm,
static inline int drm_mm_insert_node_in_range(struct drm_mm *mm,
struct drm_mm_node *node,
u64 size,
- unsigned alignment,
+ u64 alignment,
u64 start,
u64 end,
enum drm_mm_search_flags flags)
@@ -361,11 +361,11 @@ __drm_mm_interval_first(const struct drm_mm *mm, u64 start, u64 last);

void drm_mm_init_scan(struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color);
void drm_mm_init_scan_with_range(struct drm_mm *mm,
u64 size,
- unsigned alignment,
+ u64 alignment,
unsigned long color,
u64 start,
u64 end);