From patchwork Wed Dec 21 22:54:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Previn X-Patchwork-Id: 13079260 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 350A9C4167B for ; Wed, 21 Dec 2022 22:52:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CDF9010E142; Wed, 21 Dec 2022 22:51:53 +0000 (UTC) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id BA0DD10E138 for ; Wed, 21 Dec 2022 22:51:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671663109; x=1703199109; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=FOsZO5rNNM+rLrUMhHLDvZ4UBjLzI7oonCzXrY6qkLE=; b=AOU0z4W08bW3oacce5P5SLsWfHM22QZT8eTU+QDsY5gQpGQ8J8p/kdyF 6VUffT0wy4zHwUbZSphEvu8J++ny0mYsOMXrEjsYuowzUCEFQX7GI5hyZ sOIDuJA6REWDctXEc4P412x2OhaN87AT4Z5dkB8/KFB8ydFdBAO/YdKQY yvs0xYQQcmHne9LDWlv55iHZGt1yDJxBhS22r4tTmx08wHBZMBwyxADRn ej/9tbED66RwIG8Fozbd2/YR8DvSO9z11awCivnjWiTY24oeWuSp1SHPw CS8ZczDWEFbZlcYD76YExbXDPFQ3Q2s1hoFzW+xiq1fBAMYPY3OQQleq0 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10568"; a="300328212" X-IronPort-AV: E=Sophos;i="5.96,263,1665471600"; d="scan'208";a="300328212" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Dec 2022 14:51:49 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10568"; a="682183972" X-IronPort-AV: E=Sophos;i="5.96,263,1665471600"; d="scan'208";a="682183972" Received: from aalteres-desk.fm.intel.com ([10.80.57.53]) by orsmga008.jf.intel.com with ESMTP; 21 Dec 2022 14:51:48 -0800 From: Alan Previn To: intel-gfx@lists.freedesktop.org Date: Wed, 21 Dec 2022 14:54:36 -0800 Message-Id: <20221221225439.2714575-5-alan.previn.teres.alexis@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221221225439.2714575-1-alan.previn.teres.alexis@intel.com> References: <20221129004832.3735764-1-alan.previn.teres.alexis@intel.com> <20221221225439.2714575-1-alan.previn.teres.alexis@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v3 4/7] drm/i915/pxp: Invalidate all PXP fw sessions during teardown 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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" A gap was recently discovered where if an application did not invalidate all of the stream keys (intentionally or not), and the driver did a full PXP global teardown on the GT subsystem, we find that future session creation would fail on the security firmware's side of the equation. i915 is the entity that needs ensure the sessions' state across both iGT and security firmware are at a known clean point when performing a full global teardown. Architecturally speaking, i915 should inspect all active sessions and submit the invalidate-stream-key PXP command to the security firmware for each of them. However, for the upstream i915 driver we only support the arbitration session that can be created so that will be the only session we will cleanup. Signed-off-by: Alan Previn --- drivers/gpu/drm/i915/pxp/intel_pxp.h | 1 + .../drm/i915/pxp/intel_pxp_cmd_interface_42.h | 15 ++++++++ .../i915/pxp/intel_pxp_cmd_interface_cmn.h | 3 ++ drivers/gpu/drm/i915/pxp/intel_pxp_session.c | 2 ++ drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 35 +++++++++++++++++++ 5 files changed, 56 insertions(+) diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h index 04440fada711..9658d3005222 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp.h +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h @@ -24,6 +24,7 @@ void intel_pxp_init_hw(struct intel_pxp *pxp); void intel_pxp_fini_hw(struct intel_pxp *pxp); void intel_pxp_mark_termination_in_progress(struct intel_pxp *pxp); +void intel_pxp_tee_end_arb_fw_session(struct intel_pxp *pxp, u32 arb_session_id); int intel_pxp_start(struct intel_pxp *pxp); diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_42.h b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_42.h index 739f9072fa5f..26f7d9f01bf3 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_42.h +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_42.h @@ -12,6 +12,9 @@ /* PXP-Opcode for Init Session */ #define PXP42_CMDID_INIT_SESSION 0x1e +/* PXP-Opcode for Invalidate Stream Key */ +#define PXP42_CMDID_INVALIDATE_STREAM_KEY 0x00000007 + /* PXP-Input-Packet: Init Session (Arb-Session) */ struct pxp42_create_arb_in { struct pxp_cmd_header header; @@ -25,4 +28,16 @@ struct pxp42_create_arb_out { struct pxp_cmd_header header; } __packed; +/* PXP-Input-Packet: Invalidate Stream Key */ +struct pxp42_inv_stream_key_in { + struct pxp_cmd_header header; + u32 rsvd[3]; +} __packed; + +/* PXP-Output-Packet: Invalidate Stream Key */ +struct pxp42_inv_stream_key_out { + struct pxp_cmd_header header; + u32 rsvd; +} __packed; + #endif /* __INTEL_PXP_FW_INTERFACE_42_H__ */ diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_cmn.h b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_cmn.h index c2f23394f9b8..69e34ec49e78 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_cmn.h +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_cmn.h @@ -27,6 +27,9 @@ struct pxp_cmd_header { union { u32 status; /* out */ u32 stream_id; /* in */ +#define PXP_CMDHDR_EXTDATA_SESSION_VALID GENMASK(0, 0) +#define PXP_CMDHDR_EXTDATA_APP_TYPE GENMASK(1, 1) +#define PXP_CMDHDR_EXTDATA_SESSION_ID GENMASK(17, 2) }; /* Length of the message (excluding the header) */ u32 buffer_len; diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c index ae413580b81a..74ed7e16e481 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c @@ -110,6 +110,8 @@ static int pxp_terminate_arb_session_and_global(struct intel_pxp *pxp) intel_uncore_write(gt->uncore, PXP_GLOBAL_TERMINATE, 1); + intel_pxp_tee_end_arb_fw_session(pxp, ARB_SESSION); + return ret; } diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c index bef6d7f8ac55..9e247f38f3bd 100644 --- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c @@ -311,3 +311,38 @@ int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp, return ret; } + +void intel_pxp_tee_end_arb_fw_session(struct intel_pxp *pxp, u32 session_id) +{ + struct drm_i915_private *i915 = pxp->ctrl_gt->i915; + struct pxp42_inv_stream_key_in msg_in = {0}; + struct pxp42_inv_stream_key_out msg_out = {0}; + int ret, trials = 0; + +try_again: + memset(&msg_in, 0, sizeof(msg_in)); + memset(&msg_out, 0, sizeof(msg_out)); + msg_in.header.api_version = PXP_APIVER(4, 2); + msg_in.header.command_id = PXP42_CMDID_INVALIDATE_STREAM_KEY; + msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header); + + msg_in.header.stream_id = FIELD_PREP(PXP_CMDHDR_EXTDATA_SESSION_VALID, 1); + msg_in.header.stream_id |= FIELD_PREP(PXP_CMDHDR_EXTDATA_APP_TYPE, 0); + msg_in.header.stream_id |= FIELD_PREP(PXP_CMDHDR_EXTDATA_SESSION_ID, session_id); + + ret = intel_pxp_tee_io_message(pxp, + &msg_in, sizeof(msg_in), + &msg_out, sizeof(msg_out), + NULL); + + /* Cleanup coherency between GT and Firmware is critical, so try again if it fails */ + if ((ret || msg_out.header.status != 0x0) && ++trials < 3) + goto try_again; + + if (ret) + drm_err(&i915->drm, "Failed to send tee msg for inv-stream-key-%d, ret=[%d]\n", + session_id, ret); + else if (msg_out.header.status != 0x0) + drm_warn(&i915->drm, "PXP firmware failed inv-stream-key-%d with status 0x%08x\n", + session_id, msg_out.header.status); +}