From patchwork Wed Dec 8 14:16:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 12664503 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 1C2DCC433F5 for ; Wed, 8 Dec 2021 14:16:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D0EF86FF1B; Wed, 8 Dec 2021 14:16:44 +0000 (UTC) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id CA8BD6FEF0; Wed, 8 Dec 2021 14:16:42 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10191"; a="217861181" X-IronPort-AV: E=Sophos;i="5.88,189,1635231600"; d="scan'208";a="217861181" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Dec 2021 06:16:42 -0800 X-IronPort-AV: E=Sophos;i="5.88,189,1635231600"; d="scan'208";a="516252158" Received: from ramaling-i9x.iind.intel.com ([10.99.66.205]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Dec 2021 06:16:40 -0800 From: Ramalingam C To: intel-gfx , dri-devel Date: Wed, 8 Dec 2021 19:46:13 +0530 Message-Id: <20211208141613.7251-5-ramalingam.c@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20211208141613.7251-1-ramalingam.c@intel.com> References: <20211208141613.7251-1-ramalingam.c@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 4/4] drm/i915: enforce min page size for scratch X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Hellstrom Thomas , Matthew Auld , =?utf-8?q?Thomas_Hellstr=C3=B6m?= Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Matthew Auld If the device needs 64K minimum GTT pages for device local-memory, like on XEHPSDV, then we need to fail the allocation if we can't meet it, instead of falling back to 4K pages, otherwise we can't safely support the insertion of device local-memory pages for this vm, since the HW expects the correct physical alignment and size for every PTE, if we mark the page-table as 64K GTT mode. v2: s/userpsace/userspace [Thomas] Signed-off-by: Matthew Auld Signed-off-by: Ramalingam C Reviewed-by: Thomas Hellström Reviewed-by: Andi Shyti --- drivers/gpu/drm/i915/gt/intel_gtt.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c index 1428e2b9075a..b30e4478f098 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -337,6 +337,18 @@ int setup_scratch_page(struct i915_address_space *vm) if (size == I915_GTT_PAGE_SIZE_4K) return -ENOMEM; + /* + * If we need 64K minimum GTT pages for device local-memory, + * like on XEHPSDV, then we need to fail the allocation here, + * otherwise we can't safely support the insertion of + * local-memory pages for this vm, since the HW expects the + * correct physical alignment and size when the page-table is + * operating in 64K GTT mode, which includes any scratch PTEs, + * since userspace can still touch them. + */ + if (HAS_64K_PAGES(vm->i915)) + return -ENOMEM; + size = I915_GTT_PAGE_SIZE_4K; } while (1); }