Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752621AbdLEFQC (ORCPT ); Tue, 5 Dec 2017 00:16:02 -0500 Received: from mail-yb0-f195.google.com ([209.85.213.195]:41676 "EHLO mail-yb0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751416AbdLEFPz (ORCPT ); Tue, 5 Dec 2017 00:15:55 -0500 X-Google-Smtp-Source: AGs4zMZqbyUL7Ok884o5h1vR1QXzqJyZwuBk1LkIgM369/vIYfHLu+PAOPXloJOn27vMOrkTVPbx9g== From: Sean Paul To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, daniel.vetter@intel.com, seanpaul@google.com, Sean Paul , Chris Wilson , Ramalingam C , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie Subject: [PATCH v3 5/9] drm/i915: Add HDCP framework + base implementation Date: Tue, 5 Dec 2017 00:15:04 -0500 Message-Id: <20171205051513.8603-6-seanpaul@chromium.org> X-Mailer: git-send-email 2.15.0.531.g2ccb3012c9-goog In-Reply-To: <20171205051513.8603-1-seanpaul@chromium.org> References: <20171205051513.8603-1-seanpaul@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 35646 Lines: 1057 This patch adds the framework required to add HDCP support to intel connectors. It implements Aksv loading from fuse, and parts 1/2/3 of the HDCP authentication scheme. Note that without shim implementations, this does not actually implement HDCP. That will come in subsequent patches. Changes in v2: - Don't open code wait_fors (Chris) - drm_hdcp.c under MIT license (Daniel) - Move intel_hdcp_disable() call above ddi_disable (Ram) - Fix // comments (I wore a cone of shame for 12 hours to atone) (Daniel) - Justify intel_hdcp_shim with comments (Daniel) - Fixed async locking issues by adding hdcp_mutex (Daniel) - Don't alter connector_state in enable/disable (Daniel) Changes in v3: - Added hdcp_mutex/hdcp_value to make async reasonable - Added hdcp_prop_work to separate link checking & property setting - Added new helper for atomic_check state tracking (Daniel) - Moved enable/disable into atomic_commit with matching helpers - Moved intel_hdcp_check_link out of all locks when called from dp - Bumped up ksv_fifo timeout (noticed failure on one of my dongles) Cc: Chris Wilson Cc: Daniel Vetter Cc: Ramalingam C Signed-off-by: Sean Paul --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/i915_reg.h | 83 ++++ drivers/gpu/drm/i915/intel_atomic.c | 2 + drivers/gpu/drm/i915/intel_display.c | 14 + drivers/gpu/drm/i915/intel_drv.h | 88 +++++ drivers/gpu/drm/i915/intel_hdcp.c | 731 +++++++++++++++++++++++++++++++++++ 6 files changed, 919 insertions(+) create mode 100644 drivers/gpu/drm/i915/intel_hdcp.c diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 42bc8bd4ff06..3facea4eefdb 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -107,6 +107,7 @@ i915-y += intel_audio.o \ intel_fbc.o \ intel_fifo_underrun.o \ intel_frontbuffer.o \ + intel_hdcp.o \ intel_hotplug.o \ intel_modes.o \ intel_overlay.o \ diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 09bf043c1c2e..2bd2cc8441d4 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -8034,6 +8034,7 @@ enum { #define GEN9_MEM_LATENCY_LEVEL_1_5_SHIFT 8 #define GEN9_MEM_LATENCY_LEVEL_2_6_SHIFT 16 #define GEN9_MEM_LATENCY_LEVEL_3_7_SHIFT 24 +#define SKL_PCODE_LOAD_HDCP_KEYS 0x5 #define SKL_PCODE_CDCLK_CONTROL 0x7 #define SKL_CDCLK_PREPARE_FOR_CHANGE 0x3 #define SKL_CDCLK_READY_FOR_CHANGE 0x1 @@ -8335,6 +8336,88 @@ enum skl_power_gate { #define SKL_PW_TO_PG(pw) ((pw) - SKL_DISP_PW_1 + SKL_PG1) #define SKL_FUSE_PG_DIST_STATUS(pg) (1 << (27 - (pg))) + +/* HDCP Key Registers */ +#define SKL_HDCP_KEY_CONF _MMIO(0x66c00) +#define SKL_HDCP_AKSV_SEND_TRIGGER BIT(31) +#define SKL_HDCP_CLEAR_KEYS_TRIGGER BIT(30) +#define SKL_HDCP_KEY_STATUS _MMIO(0x66c04) +#define SKL_HDCP_FUSE_IN_PROGRESS BIT(7) +#define SKL_HDCP_FUSE_ERROR BIT(6) +#define SKL_HDCP_FUSE_DONE BIT(5) +#define SKL_HDCP_KEY_LOAD_STATUS BIT(1) +#define SKL_HDCP_KEY_LOAD_DONE BIT(0) +#define SKL_HDCP_AKSV_LO _MMIO(0x66c10) +#define SKL_HDCP_AKSV_HI _MMIO(0x66c14) + +/* HDCP Repeater Registers */ +#define SKL_HDCP_REP_CTL _MMIO(0x66d00) +#define SKL_HDCP_DDIB_REP_PRESENT BIT(30) +#define SKL_HDCP_DDIA_REP_PRESENT BIT(29) +#define SKL_HDCP_DDIC_REP_PRESENT BIT(28) +#define SKL_HDCP_DDID_REP_PRESENT BIT(27) +#define SKL_HDCP_DDIF_REP_PRESENT BIT(26) +#define SKL_HDCP_DDIE_REP_PRESENT BIT(25) +#define SKL_HDCP_DDIB_SHA1_M0 (1 << 20) +#define SKL_HDCP_DDIA_SHA1_M0 (2 << 20) +#define SKL_HDCP_DDIC_SHA1_M0 (3 << 20) +#define SKL_HDCP_DDID_SHA1_M0 (4 << 20) +#define SKL_HDCP_DDIF_SHA1_M0 (5 << 20) +#define SKL_HDCP_DDIE_SHA1_M0 (6 << 20) /* Bspec says 5? */ +#define SKL_HDCP_SHA1_BUSY BIT(16) +#define SKL_HDCP_SHA1_READY BIT(17) +#define SKL_HDCP_SHA1_COMPLETE BIT(18) +#define SKL_HDCP_SHA1_V_MATCH BIT(19) +#define SKL_HDCP_SHA1_TEXT_32 (1 << 1) +#define SKL_HDCP_SHA1_COMPLETE_HASH (2 << 1) +#define SKL_HDCP_SHA1_TEXT_24 (4 << 1) +#define SKL_HDCP_SHA1_TEXT_16 (5 << 1) +#define SKL_HDCP_SHA1_TEXT_8 (6 << 1) +#define SKL_HDCP_SHA1_TEXT_0 (7 << 1) +#define SKL_HDCP_SHA_V_PRIME_H0 _MMIO(0x66d04) +#define SKL_HDCP_SHA_V_PRIME_H1 _MMIO(0x66d08) +#define SKL_HDCP_SHA_V_PRIME_H2 _MMIO(0x66d0C) +#define SKL_HDCP_SHA_V_PRIME_H3 _MMIO(0x66d10) +#define SKL_HDCP_SHA_V_PRIME_H4 _MMIO(0x66d14) +#define SKL_HDCP_SHA_V_PRIME(h) _MMIO((0x66d04 + h * 4)) +#define SKL_HDCP_SHA_TEXT _MMIO(0x66d18) + +/* HDCP Auth Registers */ +#define _SKL_PORTA_HDCP_AUTHENC 0x66800 +#define _SKL_PORTB_HDCP_AUTHENC 0x66500 +#define _SKL_PORTC_HDCP_AUTHENC 0x66600 +#define _SKL_PORTD_HDCP_AUTHENC 0x66700 +#define _SKL_PORTE_HDCP_AUTHENC 0x66A00 +#define _SKL_PORTF_HDCP_AUTHENC 0x66900 +#define _SKL_PORT_HDCP_AUTHENC(port, x) _MMIO(_PICK(port, \ + _SKL_PORTA_HDCP_AUTHENC, \ + _SKL_PORTB_HDCP_AUTHENC, \ + _SKL_PORTC_HDCP_AUTHENC, \ + _SKL_PORTD_HDCP_AUTHENC, \ + _SKL_PORTE_HDCP_AUTHENC, \ + _SKL_PORTF_HDCP_AUTHENC) + x) +#define SKL_PORT_HDCP_CONF(port) _SKL_PORT_HDCP_AUTHENC(port, 0x0) +#define SKL_HDCP_CONF_CAPTURE_AN BIT(0) +#define SKL_HDCP_CONF_AUTH_AND_ENC (BIT(1) | BIT(0)) +#define SKL_PORT_HDCP_ANINIT(port) _SKL_PORT_HDCP_AUTHENC(port, 0x4) +#define SKL_PORT_HDCP_ANLO(port) _SKL_PORT_HDCP_AUTHENC(port, 0x8) +#define SKL_PORT_HDCP_ANHI(port) _SKL_PORT_HDCP_AUTHENC(port, 0xC) +#define SKL_PORT_HDCP_BKSVLO(port) _SKL_PORT_HDCP_AUTHENC(port, 0x10) +#define SKL_PORT_HDCP_BKSVHI(port) _SKL_PORT_HDCP_AUTHENC(port, 0x14) +#define SKL_PORT_HDCP_RPRIME(port) _SKL_PORT_HDCP_AUTHENC(port, 0x18) +#define SKL_PORT_HDCP_STATUS(port) _SKL_PORT_HDCP_AUTHENC(port, 0x1C) +#define SKL_HDCP_STATUS_STREAM_A_ENC BIT(31) +#define SKL_HDCP_STATUS_STREAM_B_ENC BIT(30) +#define SKL_HDCP_STATUS_STREAM_C_ENC BIT(29) +#define SKL_HDCP_STATUS_STREAM_D_ENC BIT(28) +#define SKL_HDCP_STATUS_AUTH BIT(21) +#define SKL_HDCP_STATUS_ENC BIT(20) +#define SKL_HDCP_STATUS_RI_MATCH BIT(19) +#define SKL_HDCP_STATUS_R0_READY BIT(18) +#define SKL_HDCP_STATUS_AN_READY BIT(17) +#define SKL_HDCP_STATUS_CIPHER BIT(16) +#define SKL_HDCP_STATUS_FRAME_CNT(x) ((x >> 8) & 0xff) + /* Per-pipe DDI Function Control */ #define _TRANS_DDI_FUNC_CTL_A 0x60400 #define _TRANS_DDI_FUNC_CTL_B 0x61400 diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c index 36d4e635e4ce..d452c327dc1d 100644 --- a/drivers/gpu/drm/i915/intel_atomic.c +++ b/drivers/gpu/drm/i915/intel_atomic.c @@ -110,6 +110,8 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn, to_intel_digital_connector_state(old_state); struct drm_crtc_state *crtc_state; + intel_hdcp_atomic_check(conn, old_state, new_state); + if (!new_state->crtc) return 0; diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 601c23be8264..f45c468abf98 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -12319,6 +12319,8 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state) struct drm_i915_private *dev_priv = to_i915(dev); struct drm_crtc_state *old_crtc_state, *new_crtc_state; struct drm_crtc *crtc; + struct drm_connector_state *old_conn_state, *new_conn_state; + struct drm_connector *connector; struct intel_crtc_state *intel_cstate; u64 put_domains[I915_MAX_PIPES] = {}; int i; @@ -12408,9 +12410,17 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state) } } + for_each_oldnew_connector_in_state(state, connector, old_conn_state, + new_conn_state, i) + intel_hdcp_atomic_pre_commit(connector, old_conn_state, + new_conn_state); + /* Now enable the clocks, plane, pipe, and connectors that we set up. */ dev_priv->display.update_crtcs(state); + for_each_new_connector_in_state(state, connector, new_conn_state, i) + intel_hdcp_atomic_commit(connector, new_conn_state); + /* FIXME: We should call drm_atomic_helper_commit_hw_done() here * already, but still need the state for the delayed optimization. To * fix this: @@ -15322,6 +15332,10 @@ static void intel_hpd_poll_fini(struct drm_device *dev) for_each_intel_connector_iter(connector, &conn_iter) { if (connector->modeset_retry_work.func) cancel_work_sync(&connector->modeset_retry_work); + if (connector->hdcp_shim) { + cancel_delayed_work_sync(&connector->hdcp_check_work); + cancel_work_sync(&connector->hdcp_prop_work); + } } drm_connector_list_iter_end(&conn_iter); } diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 852b3d161754..6f47a4227f5f 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -301,6 +301,76 @@ struct intel_panel { } backlight; }; +/* + * This structure serves as a translation layer between the generic HDCP code + * and the bus-specific code. What that means is that HDCP over HDMI differs + * from HDCP over DP, so to account for these differences, we need to + * communicate with the receiver through this shim. + * + * For completeness, the 2 buses differ in the following ways: + * - DP AUX vs. DDC + * HDCP registers on the receiver are set via DP AUX for DP, and + * they are set via DDC for HDMI. + * - Receiver register offsets + * The offsets of the registers are different for DP vs. HDMI + * - Receiver register masks/offsets + * For instance, the ready bit for the KSV fifo is in a different + * place on DP vs HDMI + * - Receiver register names + * Seriously. In the DP spec, the 16-bit register containing + * downstream information is called BINFO, on HDMI it's called + * BSTATUS. To confuse matters further, DP has a BSTATUS register + * with a completely different definition. + * - KSV FIFO + * On HDMI, the ksv fifo is read all at once, whereas on DP it must + * be read 3 keys at a time + * - Aksv output + * Since Aksv is hidden in hardware, there's different procedures + * to send it over DP AUX vs DDC + */ +struct intel_hdcp_shim { + /* Outputs the transmitter's An and Aksv values to the receiver. */ + int (*write_an_aksv)(struct intel_digital_port *intel_dig_port, u8 *an); + + /* Reads the receiver's key selection vector */ + int (*read_bksv)(struct intel_digital_port *intel_dig_port, u8 *bksv); + + /* + * Reads BINFO from DP receivers and BSTATUS from HDMI receivers. The + * definitions are the same in the respective specs, but the names are + * different. Call it BSTATUS since that's the name the HDMI spec + * uses and it was there first. + */ + int (*read_bstatus)(struct intel_digital_port *intel_dig_port, + u8 *bstatus); + + /* Determines whether a repeater is present downstream */ + int (*repeater_present)(struct intel_digital_port *intel_dig_port, + bool *repeater_present); + + /* Reads the receiver's Ri' value */ + int (*read_ri_prime)(struct intel_digital_port *intel_dig_port, u8 *ri); + + /* Determines if the receiver's KSV FIFO is ready for consumption */ + int (*read_ksv_ready)(struct intel_digital_port *intel_dig_port, + bool *ksv_ready); + + /* Reads the ksv fifo for num_downstream devices */ + int (*read_ksv_fifo)(struct intel_digital_port *intel_dig_port, + int num_downstream, u8 *ksv_fifo); + + /* Reads a 32-bit part of V' from the receiver */ + int (*read_v_prime_part)(struct intel_digital_port *intel_dig_port, + int i, u32 *part); + + /* Enables HDCP signalling on the port */ + int (*toggle_signalling)(struct intel_digital_port *intel_dig_port, + bool enable); + + /* Ensures the link is still protected */ + bool (*check_link)(struct intel_digital_port *intel_dig_port); +}; + struct intel_connector { struct drm_connector base; /* @@ -332,6 +402,12 @@ struct intel_connector { /* Work struct to schedule a uevent on link train failure */ struct work_struct modeset_retry_work; + + const struct intel_hdcp_shim *hdcp_shim; + struct mutex hdcp_mutex; + uint64_t hdcp_value; /* protected by hdcp_mutex */ + struct delayed_work hdcp_check_work; + struct work_struct hdcp_prop_work; }; struct intel_digital_connector_state { @@ -1763,6 +1839,18 @@ static inline void intel_backlight_device_unregister(struct intel_connector *con } #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */ +/* intel_hdcp.c */ +void intel_hdcp_atomic_check(struct drm_connector *connector, + struct drm_connector_state *old_state, + struct drm_connector_state *new_state); +void intel_hdcp_atomic_pre_commit(struct drm_connector *connector, + struct drm_connector_state *old_state, + struct drm_connector_state *new_state); +void intel_hdcp_atomic_commit(struct drm_connector *connector, + struct drm_connector_state *new_state); +int intel_hdcp_check_link(struct intel_connector *connector); +void intel_hdcp_check_work(struct work_struct *work); +void intel_hdcp_prop_work(struct work_struct *work); /* intel_psr.c */ void intel_psr_enable(struct intel_dp *intel_dp, diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c new file mode 100644 index 000000000000..4eef9505410f --- /dev/null +++ b/drivers/gpu/drm/i915/intel_hdcp.c @@ -0,0 +1,731 @@ +/* + * Copyright (C) 2017 Google, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: + * Sean Paul + */ + +#include +#include +#include +#include + +#include "intel_drv.h" +#include "i915_reg.h" + +#define KEY_LOAD_TRIES 5 + +static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port, + const struct intel_hdcp_shim *shim) +{ + int ret, read_ret; + bool ksv_ready; + + ret = __wait_for(read_ret = shim->read_ksv_ready(intel_dig_port, + &ksv_ready), + read_ret || ksv_ready, 1500 * 1000, 1000, 100 * 1000); + if (ret) + return ret; + if (read_ret) + return read_ret; + if (!ksv_ready) + return -ETIMEDOUT; + + return 0; +} + +static void intel_hdcp_clear_keys(struct drm_i915_private *dev_priv) +{ + I915_WRITE(SKL_HDCP_KEY_CONF, SKL_HDCP_CLEAR_KEYS_TRIGGER); + I915_WRITE(SKL_HDCP_KEY_STATUS, + SKL_HDCP_KEY_LOAD_DONE | SKL_HDCP_KEY_LOAD_STATUS | + SKL_HDCP_FUSE_IN_PROGRESS | SKL_HDCP_FUSE_ERROR | + SKL_HDCP_FUSE_DONE); +} + +static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv) +{ + int ret; + u32 val; + + /* Initiate loading the HDCP key from fuses */ + mutex_lock(&dev_priv->pcu_lock); + ret = sandybridge_pcode_write(dev_priv, SKL_PCODE_LOAD_HDCP_KEYS, 1); + mutex_unlock(&dev_priv->pcu_lock); + if (ret) { + DRM_ERROR("Failed to initiate HDCP key load (%d)\n", ret); + return ret; + } + + /* Wait for the keys to load (500us) */ + ret = __intel_wait_for_register(dev_priv, SKL_HDCP_KEY_STATUS, + SKL_HDCP_KEY_LOAD_DONE, + SKL_HDCP_KEY_LOAD_DONE, + 10, 1, &val); + if (ret) + return ret; + else if (!(val & SKL_HDCP_KEY_LOAD_STATUS)) + return -ENXIO; + + /* Send Aksv over to PCH display for use in authentication */ + I915_WRITE(SKL_HDCP_KEY_CONF, SKL_HDCP_AKSV_SEND_TRIGGER); + + return 0; +} + +/* Returns updated SHA-1 index */ +static int intel_write_sha_text(struct drm_i915_private *dev_priv, u32 sha_text) +{ + I915_WRITE(SKL_HDCP_SHA_TEXT, sha_text); + if (intel_wait_for_register(dev_priv, SKL_HDCP_REP_CTL, + SKL_HDCP_SHA1_READY, + SKL_HDCP_SHA1_READY, 1)) { + DRM_ERROR("Timed out waiting for SHA1 ready\n"); + return -ETIMEDOUT; + } + return 0; +} + +static +u32 intel_hdcp_get_repeater_ctl(struct intel_digital_port *intel_dig_port) +{ + enum port port = intel_dig_port->base.port; + switch(port) { + case PORT_A: + return SKL_HDCP_DDIA_REP_PRESENT | SKL_HDCP_DDIA_SHA1_M0; + case PORT_B: + return SKL_HDCP_DDIB_REP_PRESENT | SKL_HDCP_DDIB_SHA1_M0; + case PORT_C: + return SKL_HDCP_DDIC_REP_PRESENT | SKL_HDCP_DDIC_SHA1_M0; + case PORT_D: + return SKL_HDCP_DDID_REP_PRESENT | SKL_HDCP_DDID_SHA1_M0; + case PORT_E: + return SKL_HDCP_DDIE_REP_PRESENT | SKL_HDCP_DDIE_SHA1_M0; + default: + break; + } + DRM_ERROR("Unknown port %d\n", port); + return -EINVAL; +} + +/* Implements Part 2 of the HDCP authorization procedure */ +static +int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port, + const struct intel_hdcp_shim *shim) +{ + struct drm_i915_private *dev_priv; + u32 vprime, sha_text, sha_leftovers, rep_ctl; + u8 bstatus[2], num_downstream, *ksv_fifo; + int ret, i, j, sha_idx; + + dev_priv = intel_dig_port->base.base.dev->dev_private; + + ret = shim->read_bstatus(intel_dig_port, bstatus); + if (ret) + return ret; + + /* If there are no downstream devices, we're all done. */ + num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]); + if (num_downstream == 0) { + DRM_INFO("HDCP is enabled (no downstream devices)\n"); + return 0; + } + + /* Poll for ksv list ready (spec says max time allowed is 5s) */ + ret = intel_hdcp_poll_ksv_fifo(intel_dig_port, shim); + if (ret) { + DRM_ERROR("KSV list failed to become ready (%d)\n", ret); + return ret; + } + + ksv_fifo = kzalloc(num_downstream * DRM_HDCP_KSV_LEN, GFP_KERNEL); + if (!ksv_fifo) + return -ENOMEM; + + ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo); + if (ret) + return ret; + + /* Process V' values from the receiver */ + for (i = 0; i < DRM_HDCP_V_PRIME_NUM_PARTS; i++) { + ret = shim->read_v_prime_part(intel_dig_port, i, &vprime); + if (ret) + return ret; + I915_WRITE(SKL_HDCP_SHA_V_PRIME(i), vprime); + } + + /* + * We need to write the concatenation of all device KSVs, BINFO (DP) || + * BSTATUS (HDMI), and M0 (which is added via HDCP_REP_CTL). This byte + * stream is written via the HDCP_SHA_TEXT register in 32-bit + * increments. Every 64 bytes, we need to write HDCP_REP_CTL again. This + * index will keep track of our progress through the 64 bytes as well as + * helping us work the 40-bit KSVs through our 32-bit register. + * + * NOTE: data passed via HDCP_SHA_TEXT should be big-endian + */ + sha_idx = 0; + sha_text = 0; + sha_leftovers = 0; + rep_ctl = intel_hdcp_get_repeater_ctl(intel_dig_port); + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32); + for (i = 0; i < num_downstream; i++) { + unsigned sha_empty; + u8 *ksv = &ksv_fifo[i * DRM_HDCP_KSV_LEN]; + + /* Fill up the empty slots in sha_text and write it out */ + sha_empty = sizeof(sha_text) - sha_leftovers; + for (j = 0; j < sha_empty; j++) + sha_text |= ksv[j] << ((sizeof(sha_text) - j - 1) * 8); + + ret = intel_write_sha_text(dev_priv, sha_text); + if (ret < 0) + return ret; + + /* Programming guide writes this every 64 bytes */ + sha_idx += sizeof(sha_text); + if (!(sha_idx % 64)) + I915_WRITE(SKL_HDCP_REP_CTL, + rep_ctl | SKL_HDCP_SHA1_TEXT_32); + + /* Store the leftover bytes from the ksv in sha_text */ + sha_leftovers = DRM_HDCP_KSV_LEN - sha_empty; + sha_text = 0; + for (j = 0; j < sha_leftovers; j++) + sha_text |= ksv[sha_empty + j] << + ((sizeof(sha_text) - j - 1) * 8); + + /* + * If we still have room in sha_text for more data, continue. + * Otherwise, write it out immediately. + */ + if (sizeof(sha_text) > sha_leftovers) + continue; + + ret = intel_write_sha_text(dev_priv, sha_text); + if (ret < 0) + return ret; + sha_leftovers = 0; + sha_text = 0; + sha_idx += sizeof(sha_text); + } + + /* + * We need to write BINFO/BSTATUS, and M0 now. Depending on how many + * bytes are leftover from the last ksv, we might be able to fit them + * all in sha_text (first 2 cases), or we might need to split them up + * into 2 writes (last 2 cases). + */ + if (sha_leftovers == 0) { + /* Write 16 bits of text, 16 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_16); + ret = intel_write_sha_text(dev_priv, + bstatus[0] << 8 | bstatus[1]); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 32 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0); + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 16 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_16); + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + } else if (sha_leftovers == 1) { + /* Write 24 bits of text, 8 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_24); + sha_text |= bstatus[0] << 16 | bstatus[1] << 8; + /* Only 24-bits of data, must be in the LSB */ + sha_text = (sha_text & 0xffffff00) >> 8; + ret = intel_write_sha_text(dev_priv, sha_text); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 32 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0); + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 24 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_8); + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + } else if (sha_leftovers == 2) { + /* Write 32 bits of text */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32); + sha_text |= bstatus[0] << 24 | bstatus[1] << 16; + ret = intel_write_sha_text(dev_priv, sha_text); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 64 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0); + for (i = 0; i < 2; i++) { + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + } + } else if (sha_leftovers == 3) { + /* Write 32 bits of text */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32); + sha_text |= bstatus[0] << 24; + ret = intel_write_sha_text(dev_priv, sha_text); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 8 bits of text, 24 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_8); + ret = intel_write_sha_text(dev_priv, bstatus[1]); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 32 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_0); + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + + /* Write 8 bits of M0 */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_24); + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + } else { + DRM_ERROR("Invalid number of leftovers %d\n", sha_leftovers); + return -EINVAL; + } + + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_TEXT_32); + /* Fill up to 64-4 bytes with zeros (leave the last write for length) */ + while ((sha_idx % 64) < (64 - sizeof(sha_text))) { + ret = intel_write_sha_text(dev_priv, 0); + if (ret < 0) + return ret; + sha_idx += sizeof(sha_text); + } + + /* + * Last write gets the length of the concatenation in bits. That is: + * - 5 bytes per device + * - 10 bytes for BINFO/BSTATUS(2), M0(8) + */ + sha_text = (num_downstream * 5 + 10) * 8; + ret = intel_write_sha_text(dev_priv, sha_text); + if (ret < 0) + return ret; + + /* Tell the HW we're done with the hash and wait for it to ACK */ + I915_WRITE(SKL_HDCP_REP_CTL, rep_ctl | SKL_HDCP_SHA1_COMPLETE_HASH); + if (intel_wait_for_register(dev_priv, SKL_HDCP_REP_CTL, + SKL_HDCP_SHA1_COMPLETE, + SKL_HDCP_SHA1_COMPLETE, 1)) { + DRM_ERROR("Timed out waiting for SHA1 complete\n"); + return -ETIMEDOUT; + } + if (!(I915_READ(SKL_HDCP_REP_CTL) & SKL_HDCP_SHA1_V_MATCH)) { + DRM_ERROR("SHA-1 mismatch, HDCP failed\n"); + return -ENXIO; + } + + DRM_INFO("HDCP is enabled (%d downstream devices)\n", num_downstream); + return 0; +} + +/* Implements Part 1 of the HDCP authorization procedure */ +static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port, + const struct intel_hdcp_shim *shim) +{ + struct drm_i915_private *dev_priv; + enum port port; + unsigned long r0_prime_gen_start; + int ret, i; + union { + u32 reg[2]; + u8 shim[DRM_HDCP_AN_LEN]; + } an; + union { + u32 reg[2]; + u8 shim[DRM_HDCP_KSV_LEN]; + } bksv; + union { + u32 reg; + u8 shim[DRM_HDCP_RI_LEN]; + } ri; + bool repeater_present; + + dev_priv = intel_dig_port->base.base.dev->dev_private; + + port = intel_dig_port->base.port; + + /* Initialize An with 2 random values and acquire it */ + for (i = 0; i < 2; i++) + I915_WRITE(SKL_PORT_HDCP_ANINIT(port), get_random_long()); + I915_WRITE(SKL_PORT_HDCP_CONF(port), SKL_HDCP_CONF_CAPTURE_AN); + + /* Wait for An to be acquired */ + if (intel_wait_for_register(dev_priv, SKL_PORT_HDCP_STATUS(port), + SKL_HDCP_STATUS_AN_READY, + SKL_HDCP_STATUS_AN_READY, 1)) { + DRM_ERROR("Timed out waiting for An\n"); + return -ETIMEDOUT; + } + + an.reg[0] = I915_READ(SKL_PORT_HDCP_ANLO(port)); + an.reg[1] = I915_READ(SKL_PORT_HDCP_ANHI(port)); + ret = shim->write_an_aksv(intel_dig_port, an.shim); + if (ret) + return ret; + + r0_prime_gen_start = jiffies; + + memset(&bksv, 0, sizeof(bksv)); + ret = shim->read_bksv(intel_dig_port, bksv.shim); + if (ret) + return ret; + + I915_WRITE(SKL_PORT_HDCP_BKSVLO(port), bksv.reg[0]); + I915_WRITE(SKL_PORT_HDCP_BKSVHI(port), bksv.reg[1]); + + ret = shim->repeater_present(intel_dig_port, &repeater_present); + if (ret) + return ret; + if (repeater_present) + I915_WRITE(SKL_HDCP_REP_CTL, + intel_hdcp_get_repeater_ctl(intel_dig_port)); + + ret = shim->toggle_signalling(intel_dig_port, true); + if (ret) + return ret; + + I915_WRITE(SKL_PORT_HDCP_CONF(port), SKL_HDCP_CONF_AUTH_AND_ENC); + + /* Wait for R0 ready */ + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) & + (SKL_HDCP_STATUS_R0_READY | SKL_HDCP_STATUS_ENC), 1)) { + DRM_ERROR("Timed out waiting for R0 ready\n"); + return -ETIMEDOUT; + } + + /* + * Wait for R0' to become available, the spec says 100ms from Aksv + * write. On DP, there's an R0_READY bit available but no such bit + * exists on HDMI. Since the upper-bound is the same, we'll just do + * the stupid thing instead of polling on one and not the other. + */ + wait_remaining_ms_from_jiffies(r0_prime_gen_start, 100); + + ri.reg = 0; + ret = shim->read_ri_prime(intel_dig_port, ri.shim); + if (ret) + return ret; + I915_WRITE(SKL_PORT_HDCP_RPRIME(port), ri.reg); + + /* Wait for Ri prime match */ + if (wait_for(I915_READ(SKL_PORT_HDCP_STATUS(port)) & + (SKL_HDCP_STATUS_RI_MATCH | SKL_HDCP_STATUS_ENC), 1)) { + DRM_ERROR("Timed out waiting for Ri prime match (%x)\n", + I915_READ(SKL_PORT_HDCP_STATUS(port))); + return -ETIMEDOUT; + } + + /* Wait for encryption confirmation */ + if (intel_wait_for_register(dev_priv, SKL_PORT_HDCP_STATUS(port), + SKL_HDCP_STATUS_ENC, + SKL_HDCP_STATUS_ENC, 20)) { + DRM_ERROR("Timed out waiting for encryption\n"); + return -ETIMEDOUT; + } + + /* + * XXX: If we have MST-connected devices, we need to enable encryption + * on those as well. + */ + + return intel_hdcp_auth_downstream(intel_dig_port, shim); +} + +static +struct intel_digital_port *conn_to_dig_port(struct intel_connector *connector) +{ + return enc_to_dig_port(&intel_attached_encoder(&connector->base)->base); +} + +static int _intel_hdcp_disable(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = connector->base.dev->dev_private; + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + enum port port = intel_dig_port->base.port; + int ret; + + I915_WRITE(SKL_PORT_HDCP_CONF(port), 0); + if (intel_wait_for_register(dev_priv, SKL_PORT_HDCP_STATUS(port), ~0, 0, + 20)) { + DRM_ERROR("Failed to disable HDCP, timeout clearing status\n"); + return -ETIMEDOUT; + } + + intel_hdcp_clear_keys(dev_priv); + + ret = connector->hdcp_shim->toggle_signalling(intel_dig_port, false); + if (ret) { + DRM_ERROR("Failed to disable HDCP signalling\n"); + return ret; + } + + DRM_INFO("HDCP is disabled\n"); + return 0; +} + +static int _intel_hdcp_enable(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = connector->base.dev->dev_private; + int i, ret; + + if (!(I915_READ(SKL_FUSE_STATUS) & SKL_FUSE_PG_DIST_STATUS(1))) { + DRM_ERROR("PG1 is disabled, cannot load keys\n"); + return -ENXIO; + } + + for (i = 0; i < KEY_LOAD_TRIES; i++) { + ret = intel_hdcp_load_keys(dev_priv); + if (!ret) + break; + intel_hdcp_clear_keys(dev_priv); + } + if (ret) { + DRM_ERROR("Could not load HDCP keys, (%d)\n", ret); + return ret; + } + + ret = intel_hdcp_auth(conn_to_dig_port(connector), + connector->hdcp_shim); + if (ret) { + DRM_ERROR("Failed to authenticate HDCP (%d)\n", ret); + return ret; + } + + return 0; +} + +void intel_hdcp_check_work(struct work_struct *work) +{ + struct intel_connector *connector = container_of(to_delayed_work(work), + struct intel_connector, + hdcp_check_work); + if (!intel_hdcp_check_link(connector)) + schedule_delayed_work(&connector->hdcp_check_work, + DRM_HDCP_CHECK_PERIOD_MS); +} + +void intel_hdcp_prop_work(struct work_struct *work) +{ + struct intel_connector *connector = container_of(work, + struct intel_connector, + hdcp_prop_work); + struct drm_device *dev = connector->base.dev; + struct drm_connector_state *state; + + mutex_lock(&dev->mode_config.mutex); + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); + mutex_lock(&connector->hdcp_mutex); + + /* + * This worker is only used to flip between ENABLED/DESIRED. Either of + * those to OFF is handled by core. If hdcp_value == OFF, we're running + * just after hdcp has been disabled, so just exit + */ + if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_OFF) { + state = connector->base.state; + state->content_protection = connector->hdcp_value; + } + + mutex_unlock(&connector->hdcp_mutex); + drm_modeset_unlock(&dev->mode_config.connection_mutex); + mutex_unlock(&dev->mode_config.mutex); +} + +static int intel_hdcp_enable(struct intel_connector *connector) +{ + int ret; + + if (!connector->hdcp_shim) + return -ENOENT; + + mutex_lock(&connector->hdcp_mutex); + + ret = _intel_hdcp_enable(connector); + if (ret) + goto out; + + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_ENABLED; + schedule_work(&connector->hdcp_prop_work); + schedule_delayed_work(&connector->hdcp_check_work, + DRM_HDCP_CHECK_PERIOD_MS); +out: + mutex_unlock(&connector->hdcp_mutex); + return ret; +} + +static int intel_hdcp_disable(struct intel_connector *connector) +{ + int ret; + + if (!connector->hdcp_shim) + return -ENOENT; + + mutex_lock(&connector->hdcp_mutex); + + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_OFF; + ret = _intel_hdcp_disable(connector); + + mutex_unlock(&connector->hdcp_mutex); + cancel_delayed_work_sync(&connector->hdcp_check_work); + return ret; +} + +void intel_hdcp_atomic_check(struct drm_connector *connector, + struct drm_connector_state *old_state, + struct drm_connector_state *new_state) +{ + uint64_t old_cp = old_state->content_protection; + uint64_t new_cp = new_state->content_protection; + + if (!new_state->crtc) { + /* + * If the connector is being disabled with CP enabled, mark it + * desired so it's re-enabled when the connector is brought back + */ + if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) + new_state->content_protection = + DRM_MODE_CONTENT_PROTECTION_DESIRED; + return; + } + + /* Only drivers can set content protection enabled */ + if (old_cp != DRM_MODE_CONTENT_PROTECTION_ENABLED && + new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) + new_state->content_protection = + DRM_MODE_CONTENT_PROTECTION_DESIRED; +} + +void intel_hdcp_atomic_pre_commit(struct drm_connector *connector, + struct drm_connector_state *old_state, + struct drm_connector_state *new_state) +{ + uint64_t old_cp = old_state->content_protection; + uint64_t new_cp = new_state->content_protection; + + /* + * Disable HDCP if the connector is becoming disabled, or if requested + * via the property. + */ + if ((!new_state->crtc && old_cp != DRM_MODE_CONTENT_PROTECTION_OFF) || + (new_state->crtc && old_cp != DRM_MODE_CONTENT_PROTECTION_OFF && + new_cp == DRM_MODE_CONTENT_PROTECTION_OFF)) + intel_hdcp_disable(to_intel_connector(connector)); +} + +void intel_hdcp_atomic_commit(struct drm_connector *connector, + struct drm_connector_state *new_state) +{ + uint64_t new_cp = new_state->content_protection; + + /* Enable hdcp if it's desired */ + if (new_state->crtc && new_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED) + intel_hdcp_enable(to_intel_connector(connector)); +} + +/* Implements Part 3 of the HDCP authorization procedure */ +int intel_hdcp_check_link(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = connector->base.dev->dev_private; + struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); + enum port port = intel_dig_port->base.port; + int ret = 0; + + if (!connector->hdcp_shim) + return -ENOENT; + + mutex_lock(&connector->hdcp_mutex); + + if (connector->hdcp_value == DRM_MODE_CONTENT_PROTECTION_OFF) + goto out; + + if (!(I915_READ(SKL_PORT_HDCP_STATUS(port)) & SKL_HDCP_STATUS_ENC)) { + DRM_ERROR("HDCP check failed: link is not encrypted, %x\n", + I915_READ(SKL_PORT_HDCP_STATUS(port))); + ret = -ENXIO; + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&connector->hdcp_prop_work); + goto out; + } + + if (connector->hdcp_shim->check_link(intel_dig_port)) { + if (connector->hdcp_value != DRM_MODE_CONTENT_PROTECTION_OFF) { + connector->hdcp_value = + DRM_MODE_CONTENT_PROTECTION_ENABLED; + schedule_work(&connector->hdcp_prop_work); + } + goto out; + } + + DRM_INFO("HDCP link failed, retrying authentication\n"); + + ret = _intel_hdcp_disable(connector); + if (ret) { + DRM_ERROR("Failed to disable hdcp (%d)\n", ret); + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&connector->hdcp_prop_work); + goto out; + } + + ret = _intel_hdcp_enable(connector); + if (ret) { + DRM_ERROR("Failed to enable hdcp (%d)\n", ret); + connector->hdcp_value = DRM_MODE_CONTENT_PROTECTION_DESIRED; + schedule_work(&connector->hdcp_prop_work); + goto out; + } + +out: + mutex_unlock(&connector->hdcp_mutex); + return ret; +} -- 2.15.0.531.g2ccb3012c9-goog