drm/i915/ttm: fix 32b build

Since segment_pages is no longer a compile time constant, it looks the
DIV_ROUND_UP(node->size, segment_pages) breaks the 32b build. Simplest
is just to use the ULL variant, but really we should need not need more
than u32 for the page alignment (also we are limited by that due to the
sg->length type), so also make it all u32.

Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Fixes: aff1e0b09b54 ("drm/i915/ttm: fix sg_table construction")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Nirmoy Das <nirmoy.das@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220712174050.592550-1-matthew.auld@intel.com
(cherry picked from commit 9306b2b2dfce6931241ef804783692cee526599c)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_region.c b/drivers/gpu/drm/i915/gem/i915_gem_region.c
index f46ee16..a4fb577 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_region.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_region.c
@@ -60,6 +60,8 @@ __i915_gem_object_create_region(struct intel_memory_region *mem,
        if (page_size)
                default_page_size = page_size;
 
+       /* We should be able to fit a page within an sg entry */
+       GEM_BUG_ON(overflows_type(default_page_size, u32));
        GEM_BUG_ON(!is_power_of_2_u64(default_page_size));
        GEM_BUG_ON(default_page_size < PAGE_SIZE);
 

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index d30ebca..8f1bb6a 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -620,7 +620,7 @@ i915_ttm_resource_get_st(struct drm_i915_gem_object *obj,
                         struct ttm_resource *res)
 {
        struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
-       u64 page_alignment;
+       u32 page_alignment;
 
        if (!i915_ttm_gtt_binds_lmem(res))
                return i915_ttm_tt_get_st(bo->ttm);

diff --git a/drivers/gpu/drm/i915/i915_scatterlist.c b/drivers/gpu/drm/i915/i915_scatterlist.c
index f63b50b..dcc0818 100644 (file)
--- a/drivers/gpu/drm/i915/i915_scatterlist.c
+++ b/drivers/gpu/drm/i915/i915_scatterlist.c
@@ -79,10 +79,10 @@ void i915_refct_sgt_init(struct i915_refct_sgt *rsgt, size_t size)
  */
 struct i915_refct_sgt *i915_rsgt_from_mm_node(const struct drm_mm_node *node,
                                              u64 region_start,
-                                             u64 page_alignment)
+                                             u32 page_alignment)
 {
-       const u64 max_segment = round_down(UINT_MAX, page_alignment);
-       u64 segment_pages = max_segment >> PAGE_SHIFT;
+       const u32 max_segment = round_down(UINT_MAX, page_alignment);
+       const u32 segment_pages = max_segment >> PAGE_SHIFT;
        u64 block_size, offset, prev_end;
        struct i915_refct_sgt *rsgt;
        struct sg_table *st;
@@ -96,7 +96,7 @@ struct i915_refct_sgt *i915_rsgt_from_mm_node(const struct drm_mm_node *node,
 
        i915_refct_sgt_init(rsgt, node->size << PAGE_SHIFT);
        st = &rsgt->table;
-       if (sg_alloc_table(st, DIV_ROUND_UP(node->size, segment_pages),
+       if (sg_alloc_table(st, DIV_ROUND_UP_ULL(node->size, segment_pages),
                           GFP_KERNEL)) {
                i915_refct_sgt_put(rsgt);
                return ERR_PTR(-ENOMEM);
@@ -123,7 +123,7 @@ struct i915_refct_sgt *i915_rsgt_from_mm_node(const struct drm_mm_node *node,
                        st->nents++;
                }
 
-               len = min(block_size, max_segment - sg->length);
+               len = min_t(u64, block_size, max_segment - sg->length);
                sg->length += len;
                sg_dma_len(sg) += len;
 
@@ -155,11 +155,11 @@ struct i915_refct_sgt *i915_rsgt_from_mm_node(const struct drm_mm_node *node,
  */
 struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
                                                     u64 region_start,
-                                                    u64 page_alignment)
+                                                    u32 page_alignment)
 {
        struct i915_ttm_buddy_resource *bman_res = to_ttm_buddy_resource(res);
        const u64 size = res->num_pages << PAGE_SHIFT;
-       const u64 max_segment = round_down(UINT_MAX, page_alignment);
+       const u32 max_segment = round_down(UINT_MAX, page_alignment);
        struct drm_buddy *mm = bman_res->mm;
        struct list_head *blocks = &bman_res->blocks;
        struct drm_buddy_block *block;
@@ -207,7 +207,7 @@ struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
                                st->nents++;
                        }
 
-                       len = min(block_size, max_segment - sg->length);
+                       len = min_t(u64, block_size, max_segment - sg->length);
                        sg->length += len;
                        sg_dma_len(sg) += len;
 

diff --git a/drivers/gpu/drm/i915/i915_scatterlist.h b/drivers/gpu/drm/i915/i915_scatterlist.h
index b13e4cd..9ddb3e7 100644 (file)
--- a/drivers/gpu/drm/i915/i915_scatterlist.h
+++ b/drivers/gpu/drm/i915/i915_scatterlist.h
@@ -214,10 +214,10 @@ void i915_refct_sgt_init(struct i915_refct_sgt *rsgt, size_t size);
 
 struct i915_refct_sgt *i915_rsgt_from_mm_node(const struct drm_mm_node *node,
                                              u64 region_start,
-                                             u64 page_alignment);
+                                             u32 page_alignment);
 
 struct i915_refct_sgt *i915_rsgt_from_buddy_resource(struct ttm_resource *res,
                                                     u64 region_start,
-                                                    u64 page_alignment);
+                                                    u32 page_alignment);
 
 #endif

diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c
index 6873808..575d67b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_region_ttm.c
+++ b/drivers/gpu/drm/i915/intel_region_ttm.c
@@ -163,7 +163,7 @@ int intel_region_ttm_fini(struct intel_memory_region *mem)
 struct i915_refct_sgt *
 intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
                                  struct ttm_resource *res,
-                                 u64 page_alignment)
+                                 u32 page_alignment)
 {
        if (mem->is_range_manager) {
                struct ttm_range_mgr_node *range_node =

diff --git a/drivers/gpu/drm/i915/intel_region_ttm.h b/drivers/gpu/drm/i915/intel_region_ttm.h
index 98fba51..5bb8d8b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_region_ttm.h
+++ b/drivers/gpu/drm/i915/intel_region_ttm.h
@@ -25,7 +25,7 @@ int intel_region_ttm_fini(struct intel_memory_region *mem);
 struct i915_refct_sgt *
 intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
                                  struct ttm_resource *res,
-                                 u64 page_alignment);
+                                 u32 page_alignment);
 
 void intel_region_ttm_resource_free(struct intel_memory_region *mem,
                                    struct ttm_resource *res);