From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3A354606A889 for ; Thu, 12 Nov 2026 12:23:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=HfTqlqmz Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A2ED011209C; Thu, 12 Nov 2026 12:23:13 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id D33B1112096; Thu, 12 Nov 2026 12:23:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1794486186; x=1826022186; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=OJ9of+YFQ7QZOg35gvWbh0VD45HpR3CN407SRKIcd8w=; b=HfTqlqmzUdr8PddRYO3HILJyNj7+V6xag38HkrSCb/mc77ob6g3yVY8g XxLEopmHvFuHUYeznmfWhIYtkmdDfwxesGm+Qj0HH3DxjIVPNaK2nswdR WJ2JNIEoVrkToMHdEkFUkoi91bBTtPJ+ti0vSt078GuieIrP33DbrnYoB /IBXi17FRWAEXCtNp7syeURUIdHX1qxyF/SalbI1wlDI0Yt3ixFpLs0u9 bIwdQIn4TV56Rt3TY8MpuCReFlFXS8aiwErMS/XJEycBdvFl6fhMpiRCV i6C8MZkHFVcZ7o6srtxTFYr+8wrlu/ydwGIsjYL3w3tads3YyxaoSyteA A==; X-CSE-ConnectionGUID: UgHVrRoFQCWzNZGPoi8PuQ== X-CSE-MsgGUID: dNqSAbfJTKWgBW1ZRHWcug== X-IronPort-AV: E=McAfee;i="6800,10657,11963"; a="3149760" X-IronPort-AV: E=Sophos;i="6.27,209,1787036400"; d="scan'208";a="3149760" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Nov 2026 04:23:06 -0800 X-CSE-ConnectionGUID: T1DpV4KIQeuli3C8VKTDaQ== X-CSE-MsgGUID: 0sQqGKclSJ+/X42RbivNlQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,209,1787036400"; d="scan'208";a="9207562" Received: from kniemiec-mobl1.ger.corp.intel.com (HELO mwauld-desk.intel.com) ([10.245.244.57]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Nov 2026 04:23:05 -0800 From: Matthew Auld To: intel-xe@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , =?UTF-8?q?Christian=20K=C3=B6nig?= , Matthew Brost Subject: [PATCH] drm: increase 64-bit mmap_range size to 8TB Date: Thu, 12 Nov 2026 12:20:50 +0000 Message-ID: <20261112122049.1990826-2-matthew.auld@intel.com> X-Mailer: git-send-email 2.56.0 X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "dri-devel" X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Every GEM/TTM buffer object, including imported dma-bufs, allocates a fake mmap offset from the per-device drm_vma_offset_manager. On multi-GPU systems with large VRAM, peer-to-peer dma-buf imports across devices and processes can exhaust the current 1 TiB 64-bit range and fail BO creation or PRIME import with -ENOSPC. Skipping mmap offset allocation for imported sg buffers is not straightforward without risking userspace regressions, as existing userspace (such as Intel compute-runtime) still queries mmap_offset on imported host dma-bufs even when mapping the dma-buf fd directly. Increase DRM_FILE_PAGE_OFFSET_SIZE on 64-bit kernels so the fake offset range spans up to 8 TiB (SZ_8T). This stays strictly below panthor's DRM_PANTHOR_USER_MMIO_OFFSET_32BIT (1ULL << 43) carveout and within 32-bit compat mmap2's pgoff limit (16 TiB with 4K pages). Signed-off-by: Matthew Auld Cc: Thomas Hellström Cc: Christian König Cc: Matthew Brost --- include/drm/drm_vma_manager.h | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/include/drm/drm_vma_manager.h b/include/drm/drm_vma_manager.h index 6c2a2f21dbf0..2c3233f9dec4 100644 --- a/include/drm/drm_vma_manager.h +++ b/include/drm/drm_vma_manager.h @@ -26,16 +26,23 @@ #include #include #include +#include #include #include -/* We make up offsets for buffer objects so we can recognize them at +/* + * We make up offsets for buffer objects so we can recognize them at * mmap time. pgoff in mmap is an unsigned long, so we need to make sure - * that the faked up offset will fit + * that the faked up offset will fit. + * + * On 64-bit, cap the range at 8 TiB (SZ_8T) so offsets remain below both + * panthor's DRM_PANTHOR_USER_MMIO_OFFSET_32BIT (1ULL << 43) and 32-bit + * compat mmap2's pgoff ceiling (16 TiB with 4K pages). */ #if BITS_PER_LONG == 64 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) -#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 256) +#define DRM_FILE_PAGE_OFFSET_SIZE ((SZ_8T >> PAGE_SHIFT) - \ + DRM_FILE_PAGE_OFFSET_START) #else #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) -- 2.56.0