From patchwork Fri Jul 19 09:55:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nirmoy Das X-Patchwork-Id: 13737155 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E8CC7C3DA59 for ; Fri, 19 Jul 2024 10:11:16 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7801D10EBAC; Fri, 19 Jul 2024 10:11:16 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="ffzAXZtN"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id AC61010EBAC; Fri, 19 Jul 2024 10:11:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1721383874; x=1752919874; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=HtVUBkgUvp3WV2KMzg4FrE3KfdlNxhr8bIx1dnxf1Fc=; b=ffzAXZtNeTXCwhHZag5Q8mkUfwkwT924BVU2kwape8M4Vs6l1/705POq sXGgIP2e2pJQf8bmbVXSIAIATkfCx939C8DngrjIa2WOLf1ifdLgG8g3A jjXyNWBVQOUhh5/0qCqphEWV/hiiL63S0PzGzprtmAvJq1MEb6NqdA6ki L1aAXo4U8Jg1ZO8/JnOtT5FKDH2lyqwmENzvWjQhUD/AmRilGWT8LWICd 2JK+ziGN7MHW3HD+Xvabq8DKVn2UrpVxb/2Bsu1yBvCd5/qHBHQL6W8E5 PchlhRssuQYaZooF2k7LxXvuaeDLQ1wf8kNhE1Y+K2FD1MKp7daCVAHv0 A==; X-CSE-ConnectionGUID: jCXjwBk4Q6ChSiya2GbMtg== X-CSE-MsgGUID: wvhCJOq1Rz2/plnXFohpGA== X-IronPort-AV: E=McAfee;i="6700,10204,11137"; a="22753310" X-IronPort-AV: E=Sophos;i="6.09,220,1716274800"; d="scan'208";a="22753310" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2024 03:11:14 -0700 X-CSE-ConnectionGUID: puGwMRHXT2+V4j0FewiSqg== X-CSE-MsgGUID: zyc9BUxYTraa6FW1+N5FNg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,220,1716274800"; d="scan'208";a="50758617" Received: from nirmoyda-desk.igk.intel.com ([10.102.138.190]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jul 2024 03:11:12 -0700 From: Nirmoy Das To: dri-devel@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org, Nirmoy Das , Matthew Auld , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , =?utf-8?q?Christian_K=C3=B6nig?= Subject: [PATCH v6 1/3] drm/ttm: Add a flag to allow drivers to skip clear-on-free Date: Fri, 19 Jul 2024 11:55:04 +0200 Message-ID: <20240719095506.4068-1-nirmoy.das@intel.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Organization: Intel Deutschland GmbH, Registered Address: Am Campeon 10, 85579 Neubiberg, Germany, Commercial Register: Amtsgericht Muenchen HRB 186928 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add TTM_TT_FLAG_CLEARED_ON_FREE, which DRM drivers can set before releasing backing stores if they want to skip clear-on-free. Cc: Matthew Auld Cc: Thomas Hellström Suggested-by: Christian König Signed-off-by: Nirmoy Das Reviewed-by: Christian König --- drivers/gpu/drm/ttm/ttm_pool.c | 18 +++++++++++------- include/drm/ttm/ttm_tt.h | 6 +++++- 2 files changed, 16 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c index 6e1fd6985ffc..b78ee7524bcf 100644 --- a/drivers/gpu/drm/ttm/ttm_pool.c +++ b/drivers/gpu/drm/ttm/ttm_pool.c @@ -222,15 +222,18 @@ static void ttm_pool_unmap(struct ttm_pool *pool, dma_addr_t dma_addr, } /* Give pages into a specific pool_type */ -static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p) +static void ttm_pool_type_give(struct ttm_pool_type *pt, struct page *p, + bool cleared) { unsigned int i, num_pages = 1 << pt->order; - for (i = 0; i < num_pages; ++i) { - if (PageHighMem(p)) - clear_highpage(p + i); - else - clear_page(page_address(p + i)); + if (!cleared) { + for (i = 0; i < num_pages; ++i) { + if (PageHighMem(p)) + clear_highpage(p + i); + else + clear_page(page_address(p + i)); + } } spin_lock(&pt->lock); @@ -394,6 +397,7 @@ static void ttm_pool_free_range(struct ttm_pool *pool, struct ttm_tt *tt, pgoff_t start_page, pgoff_t end_page) { struct page **pages = &tt->pages[start_page]; + bool cleared = tt->page_flags & TTM_TT_FLAG_CLEARED_ON_FREE; unsigned int order; pgoff_t i, nr; @@ -407,7 +411,7 @@ static void ttm_pool_free_range(struct ttm_pool *pool, struct ttm_tt *tt, pt = ttm_pool_select_type(pool, caching, order); if (pt) - ttm_pool_type_give(pt, *pages); + ttm_pool_type_give(pt, *pages, cleared); else ttm_pool_free_page(pool, caching, order, *pages); } diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h index 2b9d856ff388..cfaf49de2419 100644 --- a/include/drm/ttm/ttm_tt.h +++ b/include/drm/ttm/ttm_tt.h @@ -85,6 +85,9 @@ struct ttm_tt { * fault handling abuses the DMA api a bit and dma_map_attrs can't be * used to assure pgprot always matches. * + * TTM_TT_FLAG_CLEARED_ON_FREE: Set this if a drm driver handles + * clearing backing store + * * TTM_TT_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE. This is * set by TTM after ttm_tt_populate() has successfully returned, and is * then unset when TTM calls ttm_tt_unpopulate(). @@ -94,8 +97,9 @@ struct ttm_tt { #define TTM_TT_FLAG_EXTERNAL BIT(2) #define TTM_TT_FLAG_EXTERNAL_MAPPABLE BIT(3) #define TTM_TT_FLAG_DECRYPTED BIT(4) +#define TTM_TT_FLAG_CLEARED_ON_FREE BIT(5) -#define TTM_TT_FLAG_PRIV_POPULATED BIT(5) +#define TTM_TT_FLAG_PRIV_POPULATED BIT(6) uint32_t page_flags; /** @num_pages: Number of pages in the page array. */ uint32_t num_pages;