From patchwork Thu Aug 20 03:16:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhiyuan Lv X-Patchwork-Id: 7040521 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 32E1EC05AC for ; Thu, 20 Aug 2015 03:29:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 10DEE203AD for ; Thu, 20 Aug 2015 03:29:17 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id E3E48203AB for ; Thu, 20 Aug 2015 03:29:15 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4C5AC6E045; Wed, 19 Aug 2015 20:29:15 -0700 (PDT) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTP id 01A316E045 for ; Wed, 19 Aug 2015 20:29:13 -0700 (PDT) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP; 19 Aug 2015 20:29:13 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,713,1432623600"; d="scan'208";a="772165518" Received: from zlv-hp-dev.bj.intel.com (HELO zlv-hp-dev) ([10.238.158.60]) by fmsmga001.fm.intel.com with ESMTP; 19 Aug 2015 20:29:11 -0700 Date: Thu, 20 Aug 2015 11:16:25 +0800 From: Zhiyuan Lv To: intel-gfx@lists.freedesktop.org Message-ID: <20150820031625.GA5369@zlv-hp-dev> Mail-Followup-To: intel-gfx@lists.freedesktop.org, Mika Kuoppala , Dave Gordon , Michel Thierry , igvt-g@lists.01.org MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Cc: igvt-g@lists.01.org, Mika Kuoppala Subject: [Intel-gfx] [PATCH 1/7] drm/i915: preallocate pdps for 32 bit vgpu X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is based on Mika Kuoppala's patch below: http://article.gmane.org/gmane.comp.freedesktop.xorg.drivers.intel/61104/match=workaround+hw+preload The patch will preallocate the page directories for 32-bit PPGTT when i915 runs inside a virtual machine with Intel GVT-g. With this change, the root pointers in EXECLIST context will always keep the same. The change is needed for vGPU because Intel GVT-g will do page table shadowing, and needs to track all the page table changes from guest i915 driver. However, if guest PPGTT is modified through GPU commands like LRI, it is not possible to trap the operations in the right time, so it will be hard to make shadow PPGTT to work correctly. Shadow PPGTT could be much simpler with this change. Meanwhile hypervisor could simply prohibit any attempt of PPGTT modification through GPU command for security. The function gen8_preallocate_top_level_pdps() in the patch is from Mika, with only one change to set "used_pdpes" to avoid duplicated allocation later. Cc: Mika Kuoppala Cc: Dave Gordon Cc: Michel Thierry Signed-off-by: Zhiyuan Lv Signed-off-by: Zhi Wang --- drivers/gpu/drm/i915/i915_gem_gtt.c | 33 +++++++++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_lrc.c | 3 ++- 2 files changed, 35 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 4a76807..ed10e77 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1441,6 +1441,33 @@ static void gen8_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m) } } +static int gen8_preallocate_top_level_pdps(struct i915_hw_ppgtt *ppgtt) +{ + unsigned long *new_page_dirs, **new_page_tables; + uint32_t pdpes = I915_PDPES_PER_PDP(dev); + int ret; + + /* We allocate temp bitmap for page tables for no gain + * but as this is for init only, lets keep the things simple + */ + ret = alloc_gen8_temp_bitmaps(&new_page_dirs, &new_page_tables, pdpes); + if (ret) + return ret; + + /* Allocate for all pdps regardless of how the ppgtt + * was defined. + */ + ret = gen8_ppgtt_alloc_page_directories(&ppgtt->base, &ppgtt->pdp, + 0, 1ULL << 32, + new_page_dirs); + if (!ret) + *ppgtt->pdp.used_pdpes = *new_page_dirs; + + free_gen8_temp_bitmaps(new_page_dirs, new_page_tables, pdpes); + + return ret; +} + /* * GEN8 legacy ppgtt programming is accomplished through a max 4 PDP registers * with a net effect resembling a 2-level page table in normal x86 terms. Each @@ -1484,6 +1511,12 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt) trace_i915_page_directory_pointer_entry_alloc(&ppgtt->base, 0, 0, GEN8_PML4E_SHIFT); + + if (intel_vgpu_active(ppgtt->base.dev)) { + ret = gen8_preallocate_top_level_pdps(ppgtt); + if (ret) + goto free_scratch; + } } return 0; diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index e77b6b0..2dc8709 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1540,7 +1540,8 @@ static int gen8_emit_bb_start(struct drm_i915_gem_request *req, * not needed in 48-bit.*/ if (req->ctx->ppgtt && (intel_ring_flag(req->ring) & req->ctx->ppgtt->pd_dirty_rings)) { - if (!USES_FULL_48BIT_PPGTT(req->i915)) { + if (!USES_FULL_48BIT_PPGTT(req->i915) && + !intel_vgpu_active(req->i915->dev)) { ret = intel_logical_ring_emit_pdps(req); if (ret) return ret;