From: Zhao Liu <zhao1.liu@xxxxxxxxx> The use of kmap_atomic() is being deprecated in favor of kmap_local_page()[1]. The main difference between atomic and local mappings is that local mappings doesn't disable page faults or preemption. In drm/i915/gem/selftests/i915_gem_context.c, functions cpu_fill() and cpu_check() mainly uses mapping to flush cache and check/assign the value. There're 2 reasons why cpu_fill() and cpu_check() don't need to disable pagefaults and preemption for mapping: 1. The flush operation is safe for CPU hotplug when preemption is not disabled. cpu_fill() and cpu_check() call drm_clflush_virt_range() to use CLFLUSHOPT or WBINVD to flush. Since CLFLUSHOPT is global on x86 and WBINVD is called on each cpu in drm_clflush_virt_range(), the flush operation is global and any issue with cpu's being added or removed can be handled safely. 2. Any context switch caused by preemption or sleep (pagefault may cause sleep) doesn't affect the validity of local mapping. Therefore, cpu_fill() and cpu_check() are functions where the use of kmap_local_page() in place of kmap_atomic() is correctly suited. Convert the calls of kmap_atomic() / kunmap_atomic() to kmap_local_page() / kunmap_local(). [1]: https://lore.kernel.org/all/20220813220034.806698-1-ira.weiny@xxxxxxxxx Suggested-by: Dave Hansen <dave.hansen@xxxxxxxxx> Suggested-by: Ira Weiny <ira.weiny@xxxxxxxxx> Suggested-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx> Signed-off-by: Zhao Liu <zhao1.liu@xxxxxxxxx> --- Suggested by credits: Dave: Referred to his explanation about cache flush. Ira: Referred to his task document, review comments and explanation about cache flush. Fabio: Referred to his boiler plate commit message. --- drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c index c6ad67b90e8a..736337f23f78 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c @@ -466,12 +466,12 @@ static int cpu_fill(struct drm_i915_gem_object *obj, u32 value) for (n = 0; n < real_page_count(obj); n++) { u32 *map; - map = kmap_atomic(i915_gem_object_get_page(obj, n)); + map = kmap_local_page(i915_gem_object_get_page(obj, n)); for (m = 0; m < DW_PER_PAGE; m++) map[m] = value; if (!has_llc) drm_clflush_virt_range(map, PAGE_SIZE); - kunmap_atomic(map); + kunmap_local(map); } i915_gem_object_finish_access(obj); @@ -496,7 +496,7 @@ static noinline int cpu_check(struct drm_i915_gem_object *obj, for (n = 0; n < real_page_count(obj); n++) { u32 *map; - map = kmap_atomic(i915_gem_object_get_page(obj, n)); + map = kmap_local_page(i915_gem_object_get_page(obj, n)); if (needs_flush & CLFLUSH_BEFORE) drm_clflush_virt_range(map, PAGE_SIZE); @@ -522,7 +522,7 @@ static noinline int cpu_check(struct drm_i915_gem_object *obj, } out_unmap: - kunmap_atomic(map); + kunmap_local(map); if (err) break; } -- 2.34.1
