diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c index ce8282e67e845..6ed0e19552159 100644 --- a/drivers/gpu/drm/xe/xe_bo.c +++ b/drivers/gpu/drm/xe/xe_bo.c @@ -396,6 +396,14 @@ static struct ttm_tt *xe_ttm_tt_create(struct ttm_buffer_object *ttm_bo, caching = ttm_uncached; } + /* + * If the device can support gpu clear system pages then set proper ttm + * flag. Zeroed pages are only required for ttm_bo_type_device so + * unwanted data is not leaked to userspace. + */ + if (ttm_bo->type == ttm_bo_type_device && xe->mem.gpu_page_clear_sys) + page_flags |= TTM_TT_FLAG_CLEARED_ON_FREE; + err = ttm_tt_init(&tt->ttm, &bo->ttm, page_flags, caching, extra_pages); if (err) { kfree(tt); @@ -417,6 +425,10 @@ static int xe_ttm_tt_populate(struct ttm_device *ttm_dev, struct ttm_tt *tt, if (tt->page_flags & TTM_TT_FLAG_EXTERNAL) return 0; + /* Clear TTM_TT_FLAG_ZERO_ALLOC when GPU is set to clear system pages */ + if (tt->page_flags & TTM_TT_FLAG_CLEARED_ON_FREE) + tt->page_flags &= ~TTM_TT_FLAG_ZERO_ALLOC; + err = ttm_pool_alloc(&ttm_dev->pool, tt, ctx); if (err) return err; @@ -659,8 +671,16 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict, bool needs_clear; bool handle_system_ccs = (!IS_DGFX(xe) && xe_bo_needs_ccs_pages(bo) && ttm && ttm_tt_is_populated(ttm)) ? true : false; + bool clear_system_pages; int ret = 0; + /* + * Clear TTM_TT_FLAG_CLEARED_ON_FREE on bo creation path when + * moving to system as the bo doesn't have dma_mapping. + */ + if (!old_mem && ttm && !ttm_tt_is_populated(ttm)) + ttm->page_flags &= ~TTM_TT_FLAG_CLEARED_ON_FREE; + /* Bo creation path, moving to system or TT. */ if ((!old_mem && ttm) && !handle_system_ccs) { if (new_mem->mem_type == XE_PL_TT) @@ -683,8 +703,10 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict, move_lacks_source = handle_system_ccs ? (!bo->ccs_cleared) : (!mem_type_is_vram(old_mem_type) && !tt_has_data); + clear_system_pages = ttm && (ttm->page_flags & TTM_TT_FLAG_CLEARED_ON_FREE); needs_clear = (ttm && ttm->page_flags & TTM_TT_FLAG_ZERO_ALLOC) || - (!ttm && ttm_bo->type == ttm_bo_type_device); + (!ttm && ttm_bo->type == ttm_bo_type_device) || + clear_system_pages; if (new_mem->mem_type == XE_PL_TT) { ret = xe_tt_map_sg(ttm); @@ -796,7 +818,7 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict, if (move_lacks_source) { u32 flags = 0; - if (mem_type_is_vram(new_mem->mem_type)) + if (mem_type_is_vram(new_mem->mem_type) || clear_system_pages) flags |= XE_MIGRATE_CLEAR_FLAG_FULL; else if (handle_system_ccs) flags |= XE_MIGRATE_CLEAR_FLAG_CCS_DATA; diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h index fc89420d0ba6d..cb60bc5ec21b5 100644 --- a/drivers/gpu/drm/xe/xe_device_types.h +++ b/drivers/gpu/drm/xe/xe_device_types.h @@ -339,6 +339,8 @@ struct xe_device { struct xe_mem_region vram; /** @mem.sys_mgr: system TTM manager */ struct ttm_resource_manager sys_mgr; + /** @mem.gpu_page_clear_sys: clear system pages offloaded to GPU */ + bool gpu_page_clear_sys; } mem; /** @sriov: device level virtualization data */ diff --git a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c index 9844a8edbfe19..e0ac20f20758e 100644 --- a/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c +++ b/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c @@ -117,5 +117,17 @@ int xe_ttm_sys_mgr_init(struct xe_device *xe) ttm_resource_manager_init(man, &xe->ttm, gtt_size >> PAGE_SHIFT); ttm_set_driver_manager(&xe->ttm, XE_PL_TT, man); ttm_resource_manager_set_used(man, true); + + /* + * On iGFX device with flat CCS, we clear CCS metadata, let's extend that + * and use GPU to clear pages as well. + * + * Disable this when init_on_free and/or init_on_alloc is on to avoid double + * zeroing pages with CPU and GPU. + */ + if (xe_device_has_flat_ccs(xe) && !IS_DGFX(xe) && + !want_init_on_alloc(GFP_USER) && !want_init_on_free()) + xe->mem.gpu_page_clear_sys = true; + return drmm_add_action_or_reset(&xe->drm, ttm_sys_mgr_fini, xe); }