From patchwork Tue Apr 3 13:57:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ramalingam C X-Patchwork-Id: 10321231 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id ACFA060532 for ; Tue, 3 Apr 2018 14:13:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A06C62881E for ; Tue, 3 Apr 2018 14:13:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9F2C02883F; Tue, 3 Apr 2018 14:13:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D30E228BE1 for ; Tue, 3 Apr 2018 14:11:50 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A5BE86E552; Tue, 3 Apr 2018 14:09:11 +0000 (UTC) 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 ESMTPS id DF2D16E54D; Tue, 3 Apr 2018 14:09:09 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Apr 2018 07:05:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,401,1517904000"; d="scan'208";a="30681031" Received: from mint-dev.iind.intel.com ([10.223.25.164]) by orsmga008.jf.intel.com with ESMTP; 03 Apr 2018 07:05:18 -0700 From: Ramalingam C To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, seanpaul@chromium.org, daniel@ffwll.ch, chris@chris-wilson.co.uk, jani.nikula@linux.intel.com, tomas.winkler@intel.com, alexander.usyskin@intel.com Date: Tue, 3 Apr 2018 19:27:40 +0530 Message-Id: <1522763873-23041-28-git-send-email-ramalingam.c@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1522763873-23041-1-git-send-email-ramalingam.c@intel.com> References: <1522763873-23041-1-git-send-email-ramalingam.c@intel.com> Subject: [Intel-gfx] [PATCH v3 27/40] drm/i915: Implement HDCP2.2 link integrity check X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: rodrigo.vivi@intel.com MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP Implements the link integrity check once in 500mSec. Once encryption is enabled, an ongoing Link Integrity Check is performed by the HDCP Receiver to check that cipher synchronization is maintained between the HDCP Transmitter and the HDCP Receiver. On the detection of synchronization lost, the HDCP Receiver must assert the corresponding bits of the RxStatus register. The Transmitter polls the RxStatus register and it may initiate re-authentication. v2: Rebased. v3: No Changes. Signed-off-by: Ramalingam C --- drivers/gpu/drm/i915/intel_hdcp.c | 81 ++++++++++++++++++++++++++++++++++++++- include/drm/drm_hdcp.h | 8 ++++ 2 files changed, 88 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c index 005627746ca5..e2aec73aefe3 100644 --- a/drivers/gpu/drm/i915/intel_hdcp.c +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -23,6 +23,8 @@ static int _intel_hdcp2_enable(struct intel_connector *connector); static int _intel_hdcp2_disable(struct intel_connector *connector); +static void intel_hdcp2_check_work(struct work_struct *work); +static int intel_hdcp2_check_link(struct intel_connector *connector); static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port, const struct intel_hdcp_shim *shim) @@ -1456,6 +1458,83 @@ static int _intel_hdcp2_enable(struct intel_connector *connector) hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED; schedule_work(&hdcp->hdcp_prop_work); - + schedule_delayed_work(&hdcp->hdcp2_check_work, + DRM_HDCP2_CHECK_PERIOD_MS); return 0; } + +static int intel_hdcp2_check_link(struct intel_connector *connector) +{ + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_hdcp *hdcp = &connector->hdcp; + enum port port = connector->encoder->port; + int ret = 0; + + if (!hdcp->hdcp_shim) + return -ENOENT; + + mutex_lock(&hdcp->hdcp_mutex); + + if (hdcp->hdcp_value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) + goto out; + + if (!(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS)) { + DRM_ERROR("HDCP check failed: link is not encrypted, %x\n", + I915_READ(HDCP2_STATUS_DDI(port))); + ret = -ENXIO; + hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&hdcp->hdcp_prop_work); + goto out; + } + + ret = hdcp->hdcp_shim->check_2_2_link(intel_dig_port); + if (!ret) { + if (hdcp->hdcp_value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { + hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED; + schedule_work(&hdcp->hdcp_prop_work); + } + goto out; + } + + DRM_INFO("[%s:%d] HDCP2.2 link failed, retrying authentication\n", + connector->base.name, connector->base.base.id); + + ret = _intel_hdcp2_disable(connector); + if (ret) { + DRM_ERROR("[%s:%d] Failed to disable hdcp2.2 (%d)\n", + connector->base.name, connector->base.base.id, ret); + + hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&hdcp->hdcp_prop_work); + goto out; + } + + ret = _intel_hdcp2_enable(connector); + if (ret) { + DRM_ERROR("[%s:%d] Failed to enable hdcp2.2 (%d)\n", + connector->base.name, connector->base.base.id, ret); + + hdcp->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&hdcp->hdcp_prop_work); + goto out; + } + +out: + mutex_unlock(&hdcp->hdcp_mutex); + return ret; +} + +static void intel_hdcp2_check_work(struct work_struct *work) +{ + struct intel_hdcp *hdcp = container_of(to_delayed_work(work), + struct intel_hdcp, + hdcp2_check_work); + struct intel_connector *connector = container_of(hdcp, + struct intel_connector, + hdcp); + + if (!intel_hdcp2_check_link(connector)) + schedule_delayed_work(&hdcp->hdcp2_check_work, + DRM_HDCP2_CHECK_PERIOD_MS); +} diff --git a/include/drm/drm_hdcp.h b/include/drm/drm_hdcp.h index f3f28414b189..b0601215c798 100644 --- a/include/drm/drm_hdcp.h +++ b/include/drm/drm_hdcp.h @@ -11,6 +11,14 @@ /* Period of hdcp checks (to ensure we're still authenticated) */ #define DRM_HDCP_CHECK_PERIOD_MS (128 * 16) +#define DRM_HDCP2_CHECK_PERIOD_MS 500 + +enum check_link_response { + DRM_HDCP_LINK_PROTECTED = 0, + DRM_HDCP_TOPOLOGY_CHANGE, + DRM_HDCP_LINK_INTEGRITY_FAILURE, + DRM_HDCP_REAUTH_REQUEST +}; /* Shared lengths/masks between HDMI/DVI/DisplayPort */ #define DRM_HDCP_AN_LEN 8