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kernel/drivers/gpu/drm/i915/display/intel_hdcp.c
tqcq e5480701d3 init repo.
2024-07-22 17:22:30 +08:00

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/* SPDX-License-Identifier: MIT */
/*
* Copyright (C) 2017 Google, Inc.
* Copyright _ 2017-2019, Intel Corporation.
*
* Authors:
* Sean Paul <seanpaul@chromium.org>
* Ramalingam C <ramalingam.c@intel.com>
*/
#include <linux/component.h>
#include <linux/i2c.h>
#include <linux/random.h>
#include <drm/drm_hdcp.h>
#include <drm/i915_component.h>
#include "i915_drv.h"
#include "i915_reg.h"
#include "intel_display_power.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_hdcp.h"
#include "intel_sideband.h"
#include "intel_connector.h"
#define KEY_LOAD_TRIES 5
#define HDCP2_LC_RETRY_CNT 3
static int intel_conn_to_vcpi(struct intel_connector *connector)
{
/* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */
return connector->port ? connector->port->vcpi.vcpi : 0;
}
static bool
intel_streams_type1_capable(struct intel_connector *connector)
{
const struct intel_hdcp_shim *shim = connector->hdcp.shim;
bool capable = false;
if (!shim)
return capable;
if (shim->streams_type1_capable)
shim->streams_type1_capable(connector, &capable);
return capable;
}
/*
* intel_hdcp_required_content_stream selects the most highest common possible HDCP
* content_type for all streams in DP MST topology because security f/w doesn't
* have any provision to mark content_type for each stream separately, it marks
* all available streams with the content_type proivided at the time of port
* authentication. This may prohibit the userspace to use type1 content on
* HDCP 2.2 capable sink because of other sink are not capable of HDCP 2.2 in
* DP MST topology. Though it is not compulsory, security fw should change its
* policy to mark different content_types for different streams.
*/
static int
intel_hdcp_required_content_stream(struct intel_digital_port *dig_port)
{
struct drm_connector_list_iter conn_iter;
struct intel_digital_port *conn_dig_port;
struct intel_connector *connector;
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
bool enforce_type0 = false;
int k;
data->k = 0;
if (dig_port->hdcp_auth_status)
return 0;
drm_connector_list_iter_begin(&i915->drm, &conn_iter);
for_each_intel_connector_iter(connector, &conn_iter) {
if (connector->base.status == connector_status_disconnected)
continue;
if (!intel_encoder_is_mst(intel_attached_encoder(connector)))
continue;
conn_dig_port = intel_attached_dig_port(connector);
if (conn_dig_port != dig_port)
continue;
if (!enforce_type0 && !intel_streams_type1_capable(connector))
enforce_type0 = true;
data->streams[data->k].stream_id = intel_conn_to_vcpi(connector);
data->k++;
/* if there is only one active stream */
if (dig_port->dp.active_mst_links <= 1)
break;
}
drm_connector_list_iter_end(&conn_iter);
if (drm_WARN_ON(&i915->drm, data->k > INTEL_NUM_PIPES(i915) || data->k == 0))
return -EINVAL;
/*
* Apply common protection level across all streams in DP MST Topology.
* Use highest supported content type for all streams in DP MST Topology.
*/
for (k = 0; k < data->k; k++)
data->streams[k].stream_type =
enforce_type0 ? DRM_MODE_HDCP_CONTENT_TYPE0 : DRM_MODE_HDCP_CONTENT_TYPE1;
return 0;
}
static
bool intel_hdcp_is_ksv_valid(u8 *ksv)
{
int i, ones = 0;
/* KSV has 20 1's and 20 0's */
for (i = 0; i < DRM_HDCP_KSV_LEN; i++)
ones += hweight8(ksv[i]);
if (ones != 20)
return false;
return true;
}
static
int intel_hdcp_read_valid_bksv(struct intel_digital_port *dig_port,
const struct intel_hdcp_shim *shim, u8 *bksv)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
int ret, i, tries = 2;
/* HDCP spec states that we must retry the bksv if it is invalid */
for (i = 0; i < tries; i++) {
ret = shim->read_bksv(dig_port, bksv);
if (ret)
return ret;
if (intel_hdcp_is_ksv_valid(bksv))
break;
}
if (i == tries) {
drm_dbg_kms(&i915->drm, "Bksv is invalid\n");
return -ENODEV;
}
return 0;
}
/* Is HDCP1.4 capable on Platform and Sink */
bool intel_hdcp_capable(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
const struct intel_hdcp_shim *shim = connector->hdcp.shim;
bool capable = false;
u8 bksv[5];
if (!shim)
return capable;
if (shim->hdcp_capable) {
shim->hdcp_capable(dig_port, &capable);
} else {
if (!intel_hdcp_read_valid_bksv(dig_port, shim, bksv))
capable = true;
}
return capable;
}
/* Is HDCP2.2 capable on Platform and Sink */
bool intel_hdcp2_capable(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
bool capable = false;
/* I915 support for HDCP2.2 */
if (!hdcp->hdcp2_supported)
return false;
/* MEI interface is solid */
mutex_lock(&dev_priv->hdcp_comp_mutex);
if (!dev_priv->hdcp_comp_added || !dev_priv->hdcp_master) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return false;
}
mutex_unlock(&dev_priv->hdcp_comp_mutex);
/* Sink's capability for HDCP2.2 */
hdcp->shim->hdcp_2_2_capable(dig_port, &capable);
return capable;
}
static bool intel_hdcp_in_use(struct drm_i915_private *dev_priv,
enum transcoder cpu_transcoder, enum port port)
{
return intel_de_read(dev_priv,
HDCP_STATUS(dev_priv, cpu_transcoder, port)) &
HDCP_STATUS_ENC;
}
static bool intel_hdcp2_in_use(struct drm_i915_private *dev_priv,
enum transcoder cpu_transcoder, enum port port)
{
return intel_de_read(dev_priv,
HDCP2_STATUS(dev_priv, cpu_transcoder, port)) &
LINK_ENCRYPTION_STATUS;
}
static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *dig_port,
const struct intel_hdcp_shim *shim)
{
int ret, read_ret;
bool ksv_ready;
/* Poll for ksv list ready (spec says max time allowed is 5s) */
ret = __wait_for(read_ret = shim->read_ksv_ready(dig_port,
&ksv_ready),
read_ret || ksv_ready, 5 * 1000 * 1000, 1000,
100 * 1000);
if (ret)
return ret;
if (read_ret)
return read_ret;
if (!ksv_ready)
return -ETIMEDOUT;
return 0;
}
static bool hdcp_key_loadable(struct drm_i915_private *dev_priv)
{
enum i915_power_well_id id;
intel_wakeref_t wakeref;
bool enabled = false;
/*
* On HSW and BDW, Display HW loads the Key as soon as Display resumes.
* On all BXT+, SW can load the keys only when the PW#1 is turned on.
*/
if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
id = HSW_DISP_PW_GLOBAL;
else
id = SKL_DISP_PW_1;
/* PG1 (power well #1) needs to be enabled */
with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref)
enabled = intel_display_power_well_is_enabled(dev_priv, id);
/*
* Another req for hdcp key loadability is enabled state of pll for
* cdclk. Without active crtc we wont land here. So we are assuming that
* cdclk is already on.
*/
return enabled;
}
static void intel_hdcp_clear_keys(struct drm_i915_private *dev_priv)
{
intel_de_write(dev_priv, HDCP_KEY_CONF, HDCP_CLEAR_KEYS_TRIGGER);
intel_de_write(dev_priv, HDCP_KEY_STATUS,
HDCP_KEY_LOAD_DONE | HDCP_KEY_LOAD_STATUS | HDCP_FUSE_IN_PROGRESS | HDCP_FUSE_ERROR | HDCP_FUSE_DONE);
}
static int intel_hdcp_load_keys(struct drm_i915_private *dev_priv)
{
int ret;
u32 val;
val = intel_de_read(dev_priv, HDCP_KEY_STATUS);
if ((val & HDCP_KEY_LOAD_DONE) && (val & HDCP_KEY_LOAD_STATUS))
return 0;
/*
* On HSW and BDW HW loads the HDCP1.4 Key when Display comes
* out of reset. So if Key is not already loaded, its an error state.
*/
if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
if (!(intel_de_read(dev_priv, HDCP_KEY_STATUS) & HDCP_KEY_LOAD_DONE))
return -ENXIO;
/*
* Initiate loading the HDCP key from fuses.
*
* BXT+ platforms, HDCP key needs to be loaded by SW. Only display
* version 9 platforms (minus BXT) differ in the key load trigger
* process from other platforms. These platforms use the GT Driver
* Mailbox interface.
*/
if (DISPLAY_VER(dev_priv) == 9 && !IS_BROXTON(dev_priv)) {
ret = sandybridge_pcode_write(dev_priv,
SKL_PCODE_LOAD_HDCP_KEYS, 1);
if (ret) {
drm_err(&dev_priv->drm,
"Failed to initiate HDCP key load (%d)\n",
ret);
return ret;
}
} else {
intel_de_write(dev_priv, HDCP_KEY_CONF, HDCP_KEY_LOAD_TRIGGER);
}
/* Wait for the keys to load (500us) */
ret = __intel_wait_for_register(&dev_priv->uncore, HDCP_KEY_STATUS,
HDCP_KEY_LOAD_DONE, HDCP_KEY_LOAD_DONE,
10, 1, &val);
if (ret)
return ret;
else if (!(val & HDCP_KEY_LOAD_STATUS))
return -ENXIO;
/* Send Aksv over to PCH display for use in authentication */
intel_de_write(dev_priv, HDCP_KEY_CONF, 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)
{
intel_de_write(dev_priv, HDCP_SHA_TEXT, sha_text);
if (intel_de_wait_for_set(dev_priv, HDCP_REP_CTL, HDCP_SHA1_READY, 1)) {
drm_err(&dev_priv->drm, "Timed out waiting for SHA1 ready\n");
return -ETIMEDOUT;
}
return 0;
}
static
u32 intel_hdcp_get_repeater_ctl(struct drm_i915_private *dev_priv,
enum transcoder cpu_transcoder, enum port port)
{
if (DISPLAY_VER(dev_priv) >= 12) {
switch (cpu_transcoder) {
case TRANSCODER_A:
return HDCP_TRANSA_REP_PRESENT |
HDCP_TRANSA_SHA1_M0;
case TRANSCODER_B:
return HDCP_TRANSB_REP_PRESENT |
HDCP_TRANSB_SHA1_M0;
case TRANSCODER_C:
return HDCP_TRANSC_REP_PRESENT |
HDCP_TRANSC_SHA1_M0;
case TRANSCODER_D:
return HDCP_TRANSD_REP_PRESENT |
HDCP_TRANSD_SHA1_M0;
default:
drm_err(&dev_priv->drm, "Unknown transcoder %d\n",
cpu_transcoder);
return -EINVAL;
}
}
switch (port) {
case PORT_A:
return HDCP_DDIA_REP_PRESENT | HDCP_DDIA_SHA1_M0;
case PORT_B:
return HDCP_DDIB_REP_PRESENT | HDCP_DDIB_SHA1_M0;
case PORT_C:
return HDCP_DDIC_REP_PRESENT | HDCP_DDIC_SHA1_M0;
case PORT_D:
return HDCP_DDID_REP_PRESENT | HDCP_DDID_SHA1_M0;
case PORT_E:
return HDCP_DDIE_REP_PRESENT | HDCP_DDIE_SHA1_M0;
default:
drm_err(&dev_priv->drm, "Unknown port %d\n", port);
return -EINVAL;
}
}
static
int intel_hdcp_validate_v_prime(struct intel_connector *connector,
const struct intel_hdcp_shim *shim,
u8 *ksv_fifo, u8 num_downstream, u8 *bstatus)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
enum transcoder cpu_transcoder = connector->hdcp.cpu_transcoder;
enum port port = dig_port->base.port;
u32 vprime, sha_text, sha_leftovers, rep_ctl;
int ret, i, j, sha_idx;
/* Process V' values from the receiver */
for (i = 0; i < DRM_HDCP_V_PRIME_NUM_PARTS; i++) {
ret = shim->read_v_prime_part(dig_port, i, &vprime);
if (ret)
return ret;
intel_de_write(dev_priv, 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(dev_priv, cpu_transcoder, port);
intel_de_write(dev_priv, HDCP_REP_CTL, rep_ctl | HDCP_SHA1_TEXT_32);
for (i = 0; i < num_downstream; i++) {
unsigned int 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++) {
u8 off = ((sizeof(sha_text) - j - 1 - sha_leftovers) * 8);
sha_text |= ksv[j] << off;
}
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))
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | HDCP_SHA1_TEXT_32);
sha_text |= bstatus[0] << 8 | bstatus[1];
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 64 bits of M0 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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);
}
/*
* Terminate the SHA-1 stream by hand. For the other leftover
* cases this is appended by the hardware.
*/
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | HDCP_SHA1_TEXT_32);
sha_text = DRM_HDCP_SHA1_TERMINATOR << 24;
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
} else if (sha_leftovers == 3) {
/* Write 32 bits of text (filled from LSB) */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | HDCP_SHA1_TEXT_32);
sha_text |= bstatus[0];
ret = intel_write_sha_text(dev_priv, sha_text);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
/* Write 8 bits of text (filled from LSB), 24 bits of M0 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | HDCP_SHA1_TEXT_24);
ret = intel_write_sha_text(dev_priv, 0);
if (ret < 0)
return ret;
sha_idx += sizeof(sha_text);
} else {
drm_dbg_kms(&dev_priv->drm, "Invalid number of leftovers %d\n",
sha_leftovers);
return -EINVAL;
}
intel_de_write(dev_priv, HDCP_REP_CTL, rep_ctl | 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 */
intel_de_write(dev_priv, HDCP_REP_CTL,
rep_ctl | HDCP_SHA1_COMPLETE_HASH);
if (intel_de_wait_for_set(dev_priv, HDCP_REP_CTL,
HDCP_SHA1_COMPLETE, 1)) {
drm_err(&dev_priv->drm, "Timed out waiting for SHA1 complete\n");
return -ETIMEDOUT;
}
if (!(intel_de_read(dev_priv, HDCP_REP_CTL) & HDCP_SHA1_V_MATCH)) {
drm_dbg_kms(&dev_priv->drm, "SHA-1 mismatch, HDCP failed\n");
return -ENXIO;
}
return 0;
}
/* Implements Part 2 of the HDCP authorization procedure */
static
int intel_hdcp_auth_downstream(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
const struct intel_hdcp_shim *shim = connector->hdcp.shim;
u8 bstatus[2], num_downstream, *ksv_fifo;
int ret, i, tries = 3;
ret = intel_hdcp_poll_ksv_fifo(dig_port, shim);
if (ret) {
drm_dbg_kms(&dev_priv->drm,
"KSV list failed to become ready (%d)\n", ret);
return ret;
}
ret = shim->read_bstatus(dig_port, bstatus);
if (ret)
return ret;
if (DRM_HDCP_MAX_DEVICE_EXCEEDED(bstatus[0]) ||
DRM_HDCP_MAX_CASCADE_EXCEEDED(bstatus[1])) {
drm_dbg_kms(&dev_priv->drm, "Max Topology Limit Exceeded\n");
return -EPERM;
}
/*
* When repeater reports 0 device count, HDCP1.4 spec allows disabling
* the HDCP encryption. That implies that repeater can't have its own
* display. As there is no consumption of encrypted content in the
* repeater with 0 downstream devices, we are failing the
* authentication.
*/
num_downstream = DRM_HDCP_NUM_DOWNSTREAM(bstatus[0]);
if (num_downstream == 0) {
drm_dbg_kms(&dev_priv->drm,
"Repeater with zero downstream devices\n");
return -EINVAL;
}
ksv_fifo = kcalloc(DRM_HDCP_KSV_LEN, num_downstream, GFP_KERNEL);
if (!ksv_fifo) {
drm_dbg_kms(&dev_priv->drm, "Out of mem: ksv_fifo\n");
return -ENOMEM;
}
ret = shim->read_ksv_fifo(dig_port, num_downstream, ksv_fifo);
if (ret)
goto err;
if (drm_hdcp_check_ksvs_revoked(&dev_priv->drm, ksv_fifo,
num_downstream) > 0) {
drm_err(&dev_priv->drm, "Revoked Ksv(s) in ksv_fifo\n");
ret = -EPERM;
goto err;
}
/*
* When V prime mismatches, DP Spec mandates re-read of
* V prime atleast twice.
*/
for (i = 0; i < tries; i++) {
ret = intel_hdcp_validate_v_prime(connector, shim,
ksv_fifo, num_downstream,
bstatus);
if (!ret)
break;
}
if (i == tries) {
drm_dbg_kms(&dev_priv->drm,
"V Prime validation failed.(%d)\n", ret);
goto err;
}
drm_dbg_kms(&dev_priv->drm, "HDCP is enabled (%d downstream devices)\n",
num_downstream);
ret = 0;
err:
kfree(ksv_fifo);
return ret;
}
/* Implements Part 1 of the HDCP authorization procedure */
static int intel_hdcp_auth(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
const struct intel_hdcp_shim *shim = hdcp->shim;
enum transcoder cpu_transcoder = connector->hdcp.cpu_transcoder;
enum port port = dig_port->base.port;
unsigned long r0_prime_gen_start;
int ret, i, tries = 2;
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, hdcp_capable;
/*
* Detects whether the display is HDCP capable. Although we check for
* valid Bksv below, the HDCP over DP spec requires that we check
* whether the display supports HDCP before we write An. For HDMI
* displays, this is not necessary.
*/
if (shim->hdcp_capable) {
ret = shim->hdcp_capable(dig_port, &hdcp_capable);
if (ret)
return ret;
if (!hdcp_capable) {
drm_dbg_kms(&dev_priv->drm,
"Panel is not HDCP capable\n");
return -EINVAL;
}
}
/* Initialize An with 2 random values and acquire it */
for (i = 0; i < 2; i++)
intel_de_write(dev_priv,
HDCP_ANINIT(dev_priv, cpu_transcoder, port),
get_random_u32());
intel_de_write(dev_priv, HDCP_CONF(dev_priv, cpu_transcoder, port),
HDCP_CONF_CAPTURE_AN);
/* Wait for An to be acquired */
if (intel_de_wait_for_set(dev_priv,
HDCP_STATUS(dev_priv, cpu_transcoder, port),
HDCP_STATUS_AN_READY, 1)) {
drm_err(&dev_priv->drm, "Timed out waiting for An\n");
return -ETIMEDOUT;
}
an.reg[0] = intel_de_read(dev_priv,
HDCP_ANLO(dev_priv, cpu_transcoder, port));
an.reg[1] = intel_de_read(dev_priv,
HDCP_ANHI(dev_priv, cpu_transcoder, port));
ret = shim->write_an_aksv(dig_port, an.shim);
if (ret)
return ret;
r0_prime_gen_start = jiffies;
memset(&bksv, 0, sizeof(bksv));
ret = intel_hdcp_read_valid_bksv(dig_port, shim, bksv.shim);
if (ret < 0)
return ret;
if (drm_hdcp_check_ksvs_revoked(&dev_priv->drm, bksv.shim, 1) > 0) {
drm_err(&dev_priv->drm, "BKSV is revoked\n");
return -EPERM;
}
intel_de_write(dev_priv, HDCP_BKSVLO(dev_priv, cpu_transcoder, port),
bksv.reg[0]);
intel_de_write(dev_priv, HDCP_BKSVHI(dev_priv, cpu_transcoder, port),
bksv.reg[1]);
ret = shim->repeater_present(dig_port, &repeater_present);
if (ret)
return ret;
if (repeater_present)
intel_de_write(dev_priv, HDCP_REP_CTL,
intel_hdcp_get_repeater_ctl(dev_priv, cpu_transcoder, port));
ret = shim->toggle_signalling(dig_port, cpu_transcoder, true);
if (ret)
return ret;
intel_de_write(dev_priv, HDCP_CONF(dev_priv, cpu_transcoder, port),
HDCP_CONF_AUTH_AND_ENC);
/* Wait for R0 ready */
if (wait_for(intel_de_read(dev_priv, HDCP_STATUS(dev_priv, cpu_transcoder, port)) &
(HDCP_STATUS_R0_READY | HDCP_STATUS_ENC), 1)) {
drm_err(&dev_priv->drm, "Timed out waiting for R0 ready\n");
return -ETIMEDOUT;
}
/*
* Wait for R0' to become available. The spec says 100ms from Aksv, but
* some monitors can take longer than this. We'll set the timeout at
* 300ms just to be sure.
*
* 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, 300);
tries = 3;
/*
* DP HDCP Spec mandates the two more reattempt to read R0, incase
* of R0 mismatch.
*/
for (i = 0; i < tries; i++) {
ri.reg = 0;
ret = shim->read_ri_prime(dig_port, ri.shim);
if (ret)
return ret;
intel_de_write(dev_priv,
HDCP_RPRIME(dev_priv, cpu_transcoder, port),
ri.reg);
/* Wait for Ri prime match */
if (!wait_for(intel_de_read(dev_priv, HDCP_STATUS(dev_priv, cpu_transcoder, port)) &
(HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC), 1))
break;
}
if (i == tries) {
drm_dbg_kms(&dev_priv->drm,
"Timed out waiting for Ri prime match (%x)\n",
intel_de_read(dev_priv, HDCP_STATUS(dev_priv,
cpu_transcoder, port)));
return -ETIMEDOUT;
}
/* Wait for encryption confirmation */
if (intel_de_wait_for_set(dev_priv,
HDCP_STATUS(dev_priv, cpu_transcoder, port),
HDCP_STATUS_ENC,
HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) {
drm_err(&dev_priv->drm, "Timed out waiting for encryption\n");
return -ETIMEDOUT;
}
/* DP MST Auth Part 1 Step 2.a and Step 2.b */
if (shim->stream_encryption) {
ret = shim->stream_encryption(connector, true);
if (ret) {
drm_err(&dev_priv->drm, "[%s:%d] Failed to enable HDCP 1.4 stream enc\n",
connector->base.name, connector->base.base.id);
return ret;
}
drm_dbg_kms(&dev_priv->drm, "HDCP 1.4 transcoder: %s stream encrypted\n",
transcoder_name(hdcp->stream_transcoder));
}
if (repeater_present)
return intel_hdcp_auth_downstream(connector);
drm_dbg_kms(&dev_priv->drm, "HDCP is enabled (no repeater present)\n");
return 0;
}
static int _intel_hdcp_disable(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
enum port port = dig_port->base.port;
enum transcoder cpu_transcoder = hdcp->cpu_transcoder;
u32 repeater_ctl;
int ret;
drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP is being disabled...\n",
connector->base.name, connector->base.base.id);
if (hdcp->shim->stream_encryption) {
ret = hdcp->shim->stream_encryption(connector, false);
if (ret) {
drm_err(&dev_priv->drm, "[%s:%d] Failed to disable HDCP 1.4 stream enc\n",
connector->base.name, connector->base.base.id);
return ret;
}
drm_dbg_kms(&dev_priv->drm, "HDCP 1.4 transcoder: %s stream encryption disabled\n",
transcoder_name(hdcp->stream_transcoder));
/*
* If there are other connectors on this port using HDCP,
* don't disable it until it disabled HDCP encryption for
* all connectors in MST topology.
*/
if (dig_port->num_hdcp_streams > 0)
return 0;
}
hdcp->hdcp_encrypted = false;
intel_de_write(dev_priv, HDCP_CONF(dev_priv, cpu_transcoder, port), 0);
if (intel_de_wait_for_clear(dev_priv,
HDCP_STATUS(dev_priv, cpu_transcoder, port),
~0, HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) {
drm_err(&dev_priv->drm,
"Failed to disable HDCP, timeout clearing status\n");
return -ETIMEDOUT;
}
repeater_ctl = intel_hdcp_get_repeater_ctl(dev_priv, cpu_transcoder,
port);
intel_de_write(dev_priv, HDCP_REP_CTL,
intel_de_read(dev_priv, HDCP_REP_CTL) & ~repeater_ctl);
ret = hdcp->shim->toggle_signalling(dig_port, cpu_transcoder, false);
if (ret) {
drm_err(&dev_priv->drm, "Failed to disable HDCP signalling\n");
return ret;
}
drm_dbg_kms(&dev_priv->drm, "HDCP is disabled\n");
return 0;
}
static int _intel_hdcp_enable(struct intel_connector *connector)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
int i, ret, tries = 3;
drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP is being enabled...\n",
connector->base.name, connector->base.base.id);
if (!hdcp_key_loadable(dev_priv)) {
drm_err(&dev_priv->drm, "HDCP key Load is not possible\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_err(&dev_priv->drm, "Could not load HDCP keys, (%d)\n",
ret);
return ret;
}
/* Incase of authentication failures, HDCP spec expects reauth. */
for (i = 0; i < tries; i++) {
ret = intel_hdcp_auth(connector);
if (!ret) {
hdcp->hdcp_encrypted = true;
return 0;
}
drm_dbg_kms(&dev_priv->drm, "HDCP Auth failure (%d)\n", ret);
/* Ensuring HDCP encryption and signalling are stopped. */
_intel_hdcp_disable(connector);
}
drm_dbg_kms(&dev_priv->drm,
"HDCP authentication failed (%d tries/%d)\n", tries, ret);
return ret;
}
static struct intel_connector *intel_hdcp_to_connector(struct intel_hdcp *hdcp)
{
return container_of(hdcp, struct intel_connector, hdcp);
}
static void intel_hdcp_update_value(struct intel_connector *connector,
u64 value, bool update_property)
{
struct drm_device *dev = connector->base.dev;
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct intel_hdcp *hdcp = &connector->hdcp;
drm_WARN_ON(connector->base.dev, !mutex_is_locked(&hdcp->mutex));
if (hdcp->value == value)
return;
drm_WARN_ON(dev, !mutex_is_locked(&dig_port->hdcp_mutex));
if (hdcp->value == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
if (!drm_WARN_ON(dev, dig_port->num_hdcp_streams == 0))
dig_port->num_hdcp_streams--;
} else if (value == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
dig_port->num_hdcp_streams++;
}
hdcp->value = value;
if (update_property) {
drm_connector_get(&connector->base);
schedule_work(&hdcp->prop_work);
}
}
/* Implements Part 3 of the HDCP authorization procedure */
static int intel_hdcp_check_link(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
enum port port = dig_port->base.port;
enum transcoder cpu_transcoder;
int ret = 0;
mutex_lock(&hdcp->mutex);
mutex_lock(&dig_port->hdcp_mutex);
cpu_transcoder = hdcp->cpu_transcoder;
/* Check_link valid only when HDCP1.4 is enabled */
if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_ENABLED ||
!hdcp->hdcp_encrypted) {
ret = -EINVAL;
goto out;
}
if (drm_WARN_ON(&dev_priv->drm,
!intel_hdcp_in_use(dev_priv, cpu_transcoder, port))) {
drm_err(&dev_priv->drm,
"%s:%d HDCP link stopped encryption,%x\n",
connector->base.name, connector->base.base.id,
intel_de_read(dev_priv, HDCP_STATUS(dev_priv, cpu_transcoder, port)));
ret = -ENXIO;
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_DESIRED,
true);
goto out;
}
if (hdcp->shim->check_link(dig_port, connector)) {
if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_ENABLED, true);
}
goto out;
}
drm_dbg_kms(&dev_priv->drm,
"[%s:%d] HDCP link failed, retrying authentication\n",
connector->base.name, connector->base.base.id);
ret = _intel_hdcp_disable(connector);
if (ret) {
drm_err(&dev_priv->drm, "Failed to disable hdcp (%d)\n", ret);
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_DESIRED,
true);
goto out;
}
ret = _intel_hdcp_enable(connector);
if (ret) {
drm_err(&dev_priv->drm, "Failed to enable hdcp (%d)\n", ret);
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_DESIRED,
true);
goto out;
}
out:
mutex_unlock(&dig_port->hdcp_mutex);
mutex_unlock(&hdcp->mutex);
return ret;
}
static void intel_hdcp_prop_work(struct work_struct *work)
{
struct intel_hdcp *hdcp = container_of(work, struct intel_hdcp,
prop_work);
struct intel_connector *connector = intel_hdcp_to_connector(hdcp);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
drm_modeset_lock(&dev_priv->drm.mode_config.connection_mutex, NULL);
mutex_lock(&hdcp->mutex);
/*
* This worker is only used to flip between ENABLED/DESIRED. Either of
* those to UNDESIRED is handled by core. If value == UNDESIRED,
* we're running just after hdcp has been disabled, so just exit
*/
if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
drm_hdcp_update_content_protection(&connector->base,
hdcp->value);
mutex_unlock(&hdcp->mutex);
drm_modeset_unlock(&dev_priv->drm.mode_config.connection_mutex);
drm_connector_put(&connector->base);
}
bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port)
{
return INTEL_INFO(dev_priv)->display.has_hdcp &&
(DISPLAY_VER(dev_priv) >= 12 || port < PORT_E);
}
static int
hdcp2_prepare_ake_init(struct intel_connector *connector,
struct hdcp2_ake_init *ake_data)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->initiate_hdcp2_session(comp->mei_dev, data, ake_data);
if (ret)
drm_dbg_kms(&dev_priv->drm, "Prepare_ake_init failed. %d\n",
ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int
hdcp2_verify_rx_cert_prepare_km(struct intel_connector *connector,
struct hdcp2_ake_send_cert *rx_cert,
bool *paired,
struct hdcp2_ake_no_stored_km *ek_pub_km,
size_t *msg_sz)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->verify_receiver_cert_prepare_km(comp->mei_dev, data,
rx_cert, paired,
ek_pub_km, msg_sz);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Verify rx_cert failed. %d\n",
ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int hdcp2_verify_hprime(struct intel_connector *connector,
struct hdcp2_ake_send_hprime *rx_hprime)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->verify_hprime(comp->mei_dev, data, rx_hprime);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Verify hprime failed. %d\n", ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int
hdcp2_store_pairing_info(struct intel_connector *connector,
struct hdcp2_ake_send_pairing_info *pairing_info)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->store_pairing_info(comp->mei_dev, data, pairing_info);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Store pairing info failed. %d\n",
ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int
hdcp2_prepare_lc_init(struct intel_connector *connector,
struct hdcp2_lc_init *lc_init)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->initiate_locality_check(comp->mei_dev, data, lc_init);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Prepare lc_init failed. %d\n",
ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int
hdcp2_verify_lprime(struct intel_connector *connector,
struct hdcp2_lc_send_lprime *rx_lprime)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->verify_lprime(comp->mei_dev, data, rx_lprime);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Verify L_Prime failed. %d\n",
ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int hdcp2_prepare_skey(struct intel_connector *connector,
struct hdcp2_ske_send_eks *ske_data)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->get_session_key(comp->mei_dev, data, ske_data);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Get session key failed. %d\n",
ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int
hdcp2_verify_rep_topology_prepare_ack(struct intel_connector *connector,
struct hdcp2_rep_send_receiverid_list
*rep_topology,
struct hdcp2_rep_send_ack *rep_send_ack)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->repeater_check_flow_prepare_ack(comp->mei_dev, data,
rep_topology,
rep_send_ack);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm,
"Verify rep topology failed. %d\n", ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int
hdcp2_verify_mprime(struct intel_connector *connector,
struct hdcp2_rep_stream_ready *stream_ready)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->verify_mprime(comp->mei_dev, data, stream_ready);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Verify mprime failed. %d\n", ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int hdcp2_authenticate_port(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->enable_hdcp_authentication(comp->mei_dev, data);
if (ret < 0)
drm_dbg_kms(&dev_priv->drm, "Enable hdcp auth failed. %d\n",
ret);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int hdcp2_close_mei_session(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct i915_hdcp_comp_master *comp;
int ret;
mutex_lock(&dev_priv->hdcp_comp_mutex);
comp = dev_priv->hdcp_master;
if (!comp || !comp->ops) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return -EINVAL;
}
ret = comp->ops->close_hdcp_session(comp->mei_dev,
&dig_port->hdcp_port_data);
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return ret;
}
static int hdcp2_deauthenticate_port(struct intel_connector *connector)
{
return hdcp2_close_mei_session(connector);
}
/* Authentication flow starts from here */
static int hdcp2_authentication_key_exchange(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
union {
struct hdcp2_ake_init ake_init;
struct hdcp2_ake_send_cert send_cert;
struct hdcp2_ake_no_stored_km no_stored_km;
struct hdcp2_ake_send_hprime send_hprime;
struct hdcp2_ake_send_pairing_info pairing_info;
} msgs;
const struct intel_hdcp_shim *shim = hdcp->shim;
size_t size;
int ret;
/* Init for seq_num */
hdcp->seq_num_v = 0;
hdcp->seq_num_m = 0;
ret = hdcp2_prepare_ake_init(connector, &msgs.ake_init);
if (ret < 0)
return ret;
ret = shim->write_2_2_msg(dig_port, &msgs.ake_init,
sizeof(msgs.ake_init));
if (ret < 0)
return ret;
ret = shim->read_2_2_msg(dig_port, HDCP_2_2_AKE_SEND_CERT,
&msgs.send_cert, sizeof(msgs.send_cert));
if (ret < 0)
return ret;
if (msgs.send_cert.rx_caps[0] != HDCP_2_2_RX_CAPS_VERSION_VAL) {
drm_dbg_kms(&dev_priv->drm, "cert.rx_caps dont claim HDCP2.2\n");
return -EINVAL;
}
hdcp->is_repeater = HDCP_2_2_RX_REPEATER(msgs.send_cert.rx_caps[2]);
if (drm_hdcp_check_ksvs_revoked(&dev_priv->drm,
msgs.send_cert.cert_rx.receiver_id,
1) > 0) {
drm_err(&dev_priv->drm, "Receiver ID is revoked\n");
return -EPERM;
}
/*
* Here msgs.no_stored_km will hold msgs corresponding to the km
* stored also.
*/
ret = hdcp2_verify_rx_cert_prepare_km(connector, &msgs.send_cert,
&hdcp->is_paired,
&msgs.no_stored_km, &size);
if (ret < 0)
return ret;
ret = shim->write_2_2_msg(dig_port, &msgs.no_stored_km, size);
if (ret < 0)
return ret;
ret = shim->read_2_2_msg(dig_port, HDCP_2_2_AKE_SEND_HPRIME,
&msgs.send_hprime, sizeof(msgs.send_hprime));
if (ret < 0)
return ret;
ret = hdcp2_verify_hprime(connector, &msgs.send_hprime);
if (ret < 0)
return ret;
if (!hdcp->is_paired) {
/* Pairing is required */
ret = shim->read_2_2_msg(dig_port,
HDCP_2_2_AKE_SEND_PAIRING_INFO,
&msgs.pairing_info,
sizeof(msgs.pairing_info));
if (ret < 0)
return ret;
ret = hdcp2_store_pairing_info(connector, &msgs.pairing_info);
if (ret < 0)
return ret;
hdcp->is_paired = true;
}
return 0;
}
static int hdcp2_locality_check(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct intel_hdcp *hdcp = &connector->hdcp;
union {
struct hdcp2_lc_init lc_init;
struct hdcp2_lc_send_lprime send_lprime;
} msgs;
const struct intel_hdcp_shim *shim = hdcp->shim;
int tries = HDCP2_LC_RETRY_CNT, ret, i;
for (i = 0; i < tries; i++) {
ret = hdcp2_prepare_lc_init(connector, &msgs.lc_init);
if (ret < 0)
continue;
ret = shim->write_2_2_msg(dig_port, &msgs.lc_init,
sizeof(msgs.lc_init));
if (ret < 0)
continue;
ret = shim->read_2_2_msg(dig_port,
HDCP_2_2_LC_SEND_LPRIME,
&msgs.send_lprime,
sizeof(msgs.send_lprime));
if (ret < 0)
continue;
ret = hdcp2_verify_lprime(connector, &msgs.send_lprime);
if (!ret)
break;
}
return ret;
}
static int hdcp2_session_key_exchange(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct intel_hdcp *hdcp = &connector->hdcp;
struct hdcp2_ske_send_eks send_eks;
int ret;
ret = hdcp2_prepare_skey(connector, &send_eks);
if (ret < 0)
return ret;
ret = hdcp->shim->write_2_2_msg(dig_port, &send_eks,
sizeof(send_eks));
if (ret < 0)
return ret;
return 0;
}
static
int _hdcp2_propagate_stream_management_info(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct intel_hdcp *hdcp = &connector->hdcp;
union {
struct hdcp2_rep_stream_manage stream_manage;
struct hdcp2_rep_stream_ready stream_ready;
} msgs;
const struct intel_hdcp_shim *shim = hdcp->shim;
int ret, streams_size_delta, i;
if (connector->hdcp.seq_num_m > HDCP_2_2_SEQ_NUM_MAX)
return -ERANGE;
/* Prepare RepeaterAuth_Stream_Manage msg */
msgs.stream_manage.msg_id = HDCP_2_2_REP_STREAM_MANAGE;
drm_hdcp_cpu_to_be24(msgs.stream_manage.seq_num_m, hdcp->seq_num_m);
msgs.stream_manage.k = cpu_to_be16(data->k);
for (i = 0; i < data->k; i++) {
msgs.stream_manage.streams[i].stream_id = data->streams[i].stream_id;
msgs.stream_manage.streams[i].stream_type = data->streams[i].stream_type;
}
streams_size_delta = (HDCP_2_2_MAX_CONTENT_STREAMS_CNT - data->k) *
sizeof(struct hdcp2_streamid_type);
/* Send it to Repeater */
ret = shim->write_2_2_msg(dig_port, &msgs.stream_manage,
sizeof(msgs.stream_manage) - streams_size_delta);
if (ret < 0)
goto out;
ret = shim->read_2_2_msg(dig_port, HDCP_2_2_REP_STREAM_READY,
&msgs.stream_ready, sizeof(msgs.stream_ready));
if (ret < 0)
goto out;
data->seq_num_m = hdcp->seq_num_m;
ret = hdcp2_verify_mprime(connector, &msgs.stream_ready);
out:
hdcp->seq_num_m++;
return ret;
}
static
int hdcp2_authenticate_repeater_topology(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
union {
struct hdcp2_rep_send_receiverid_list recvid_list;
struct hdcp2_rep_send_ack rep_ack;
} msgs;
const struct intel_hdcp_shim *shim = hdcp->shim;
u32 seq_num_v, device_cnt;
u8 *rx_info;
int ret;
ret = shim->read_2_2_msg(dig_port, HDCP_2_2_REP_SEND_RECVID_LIST,
&msgs.recvid_list, sizeof(msgs.recvid_list));
if (ret < 0)
return ret;
rx_info = msgs.recvid_list.rx_info;
if (HDCP_2_2_MAX_CASCADE_EXCEEDED(rx_info[1]) ||
HDCP_2_2_MAX_DEVS_EXCEEDED(rx_info[1])) {
drm_dbg_kms(&dev_priv->drm, "Topology Max Size Exceeded\n");
return -EINVAL;
}
/* Converting and Storing the seq_num_v to local variable as DWORD */
seq_num_v =
drm_hdcp_be24_to_cpu((const u8 *)msgs.recvid_list.seq_num_v);
if (!hdcp->hdcp2_encrypted && seq_num_v) {
drm_dbg_kms(&dev_priv->drm,
"Non zero Seq_num_v at first RecvId_List msg\n");
return -EINVAL;
}
if (seq_num_v < hdcp->seq_num_v) {
/* Roll over of the seq_num_v from repeater. Reauthenticate. */
drm_dbg_kms(&dev_priv->drm, "Seq_num_v roll over.\n");
return -EINVAL;
}
device_cnt = (HDCP_2_2_DEV_COUNT_HI(rx_info[0]) << 4 |
HDCP_2_2_DEV_COUNT_LO(rx_info[1]));
if (drm_hdcp_check_ksvs_revoked(&dev_priv->drm,
msgs.recvid_list.receiver_ids,
device_cnt) > 0) {
drm_err(&dev_priv->drm, "Revoked receiver ID(s) is in list\n");
return -EPERM;
}
ret = hdcp2_verify_rep_topology_prepare_ack(connector,
&msgs.recvid_list,
&msgs.rep_ack);
if (ret < 0)
return ret;
hdcp->seq_num_v = seq_num_v;
ret = shim->write_2_2_msg(dig_port, &msgs.rep_ack,
sizeof(msgs.rep_ack));
if (ret < 0)
return ret;
return 0;
}
static int hdcp2_authenticate_sink(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
const struct intel_hdcp_shim *shim = hdcp->shim;
int ret;
ret = hdcp2_authentication_key_exchange(connector);
if (ret < 0) {
drm_dbg_kms(&i915->drm, "AKE Failed. Err : %d\n", ret);
return ret;
}
ret = hdcp2_locality_check(connector);
if (ret < 0) {
drm_dbg_kms(&i915->drm,
"Locality Check failed. Err : %d\n", ret);
return ret;
}
ret = hdcp2_session_key_exchange(connector);
if (ret < 0) {
drm_dbg_kms(&i915->drm, "SKE Failed. Err : %d\n", ret);
return ret;
}
if (shim->config_stream_type) {
ret = shim->config_stream_type(dig_port,
hdcp->is_repeater,
hdcp->content_type);
if (ret < 0)
return ret;
}
if (hdcp->is_repeater) {
ret = hdcp2_authenticate_repeater_topology(connector);
if (ret < 0) {
drm_dbg_kms(&i915->drm,
"Repeater Auth Failed. Err: %d\n", ret);
return ret;
}
}
return ret;
}
static int hdcp2_enable_stream_encryption(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct intel_hdcp *hdcp = &connector->hdcp;
enum transcoder cpu_transcoder = hdcp->cpu_transcoder;
enum port port = dig_port->base.port;
int ret = 0;
if (!(intel_de_read(dev_priv, HDCP2_STATUS(dev_priv, cpu_transcoder, port)) &
LINK_ENCRYPTION_STATUS)) {
drm_err(&dev_priv->drm, "[%s:%d] HDCP 2.2 Link is not encrypted\n",
connector->base.name, connector->base.base.id);
ret = -EPERM;
goto link_recover;
}
if (hdcp->shim->stream_2_2_encryption) {
ret = hdcp->shim->stream_2_2_encryption(connector, true);
if (ret) {
drm_err(&dev_priv->drm, "[%s:%d] Failed to enable HDCP 2.2 stream enc\n",
connector->base.name, connector->base.base.id);
return ret;
}
drm_dbg_kms(&dev_priv->drm, "HDCP 2.2 transcoder: %s stream encrypted\n",
transcoder_name(hdcp->stream_transcoder));
}
return 0;
link_recover:
if (hdcp2_deauthenticate_port(connector) < 0)
drm_dbg_kms(&dev_priv->drm, "Port deauth failed.\n");
dig_port->hdcp_auth_status = false;
data->k = 0;
return ret;
}
static int hdcp2_enable_encryption(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
enum port port = dig_port->base.port;
enum transcoder cpu_transcoder = hdcp->cpu_transcoder;
int ret;
drm_WARN_ON(&dev_priv->drm,
intel_de_read(dev_priv, HDCP2_STATUS(dev_priv, cpu_transcoder, port)) &
LINK_ENCRYPTION_STATUS);
if (hdcp->shim->toggle_signalling) {
ret = hdcp->shim->toggle_signalling(dig_port, cpu_transcoder,
true);
if (ret) {
drm_err(&dev_priv->drm,
"Failed to enable HDCP signalling. %d\n",
ret);
return ret;
}
}
if (intel_de_read(dev_priv, HDCP2_STATUS(dev_priv, cpu_transcoder, port)) &
LINK_AUTH_STATUS) {
/* Link is Authenticated. Now set for Encryption */
intel_de_write(dev_priv,
HDCP2_CTL(dev_priv, cpu_transcoder, port),
intel_de_read(dev_priv, HDCP2_CTL(dev_priv, cpu_transcoder, port)) | CTL_LINK_ENCRYPTION_REQ);
}
ret = intel_de_wait_for_set(dev_priv,
HDCP2_STATUS(dev_priv, cpu_transcoder,
port),
LINK_ENCRYPTION_STATUS,
HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS);
dig_port->hdcp_auth_status = true;
return ret;
}
static int hdcp2_disable_encryption(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
enum port port = dig_port->base.port;
enum transcoder cpu_transcoder = hdcp->cpu_transcoder;
int ret;
drm_WARN_ON(&dev_priv->drm, !(intel_de_read(dev_priv, HDCP2_STATUS(dev_priv, cpu_transcoder, port)) &
LINK_ENCRYPTION_STATUS));
intel_de_write(dev_priv, HDCP2_CTL(dev_priv, cpu_transcoder, port),
intel_de_read(dev_priv, HDCP2_CTL(dev_priv, cpu_transcoder, port)) & ~CTL_LINK_ENCRYPTION_REQ);
ret = intel_de_wait_for_clear(dev_priv,
HDCP2_STATUS(dev_priv, cpu_transcoder,
port),
LINK_ENCRYPTION_STATUS,
HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS);
if (ret == -ETIMEDOUT)
drm_dbg_kms(&dev_priv->drm, "Disable Encryption Timedout");
if (hdcp->shim->toggle_signalling) {
ret = hdcp->shim->toggle_signalling(dig_port, cpu_transcoder,
false);
if (ret) {
drm_err(&dev_priv->drm,
"Failed to disable HDCP signalling. %d\n",
ret);
return ret;
}
}
return ret;
}
static int
hdcp2_propagate_stream_management_info(struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
int i, tries = 3, ret;
if (!connector->hdcp.is_repeater)
return 0;
for (i = 0; i < tries; i++) {
ret = _hdcp2_propagate_stream_management_info(connector);
if (!ret)
break;
/* Lets restart the auth incase of seq_num_m roll over */
if (connector->hdcp.seq_num_m > HDCP_2_2_SEQ_NUM_MAX) {
drm_dbg_kms(&i915->drm,
"seq_num_m roll over.(%d)\n", ret);
break;
}
drm_dbg_kms(&i915->drm,
"HDCP2 stream management %d of %d Failed.(%d)\n",
i + 1, tries, ret);
}
return ret;
}
static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
int ret = 0, i, tries = 3;
for (i = 0; i < tries && !dig_port->hdcp_auth_status; i++) {
ret = hdcp2_authenticate_sink(connector);
if (!ret) {
ret = hdcp2_propagate_stream_management_info(connector);
if (ret) {
drm_dbg_kms(&i915->drm,
"Stream management failed.(%d)\n",
ret);
break;
}
ret = hdcp2_authenticate_port(connector);
if (!ret)
break;
drm_dbg_kms(&i915->drm, "HDCP2 port auth failed.(%d)\n",
ret);
}
/* Clearing the mei hdcp session */
drm_dbg_kms(&i915->drm, "HDCP2.2 Auth %d of %d Failed.(%d)\n",
i + 1, tries, ret);
if (hdcp2_deauthenticate_port(connector) < 0)
drm_dbg_kms(&i915->drm, "Port deauth failed.\n");
}
if (!ret && !dig_port->hdcp_auth_status) {
/*
* Ensuring the required 200mSec min time interval between
* Session Key Exchange and encryption.
*/
msleep(HDCP_2_2_DELAY_BEFORE_ENCRYPTION_EN);
ret = hdcp2_enable_encryption(connector);
if (ret < 0) {
drm_dbg_kms(&i915->drm,
"Encryption Enable Failed.(%d)\n", ret);
if (hdcp2_deauthenticate_port(connector) < 0)
drm_dbg_kms(&i915->drm, "Port deauth failed.\n");
}
}
if (!ret)
ret = hdcp2_enable_stream_encryption(connector);
return ret;
}
static int _intel_hdcp2_enable(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct intel_hdcp *hdcp = &connector->hdcp;
int ret;
drm_dbg_kms(&i915->drm, "[%s:%d] HDCP2.2 is being enabled. Type: %d\n",
connector->base.name, connector->base.base.id,
hdcp->content_type);
/* Stream which requires encryption */
if (!intel_encoder_is_mst(intel_attached_encoder(connector))) {
data->k = 1;
data->streams[0].stream_type = hdcp->content_type;
} else {
ret = intel_hdcp_required_content_stream(dig_port);
if (ret)
return ret;
}
ret = hdcp2_authenticate_and_encrypt(connector);
if (ret) {
drm_dbg_kms(&i915->drm, "HDCP2 Type%d Enabling Failed. (%d)\n",
hdcp->content_type, ret);
return ret;
}
drm_dbg_kms(&i915->drm, "[%s:%d] HDCP2.2 is enabled. Type %d\n",
connector->base.name, connector->base.base.id,
hdcp->content_type);
hdcp->hdcp2_encrypted = true;
return 0;
}
static int
_intel_hdcp2_disable(struct intel_connector *connector, bool hdcp2_link_recovery)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct intel_hdcp *hdcp = &connector->hdcp;
int ret;
drm_dbg_kms(&i915->drm, "[%s:%d] HDCP2.2 is being Disabled\n",
connector->base.name, connector->base.base.id);
if (hdcp->shim->stream_2_2_encryption) {
ret = hdcp->shim->stream_2_2_encryption(connector, false);
if (ret) {
drm_err(&i915->drm, "[%s:%d] Failed to disable HDCP 2.2 stream enc\n",
connector->base.name, connector->base.base.id);
return ret;
}
drm_dbg_kms(&i915->drm, "HDCP 2.2 transcoder: %s stream encryption disabled\n",
transcoder_name(hdcp->stream_transcoder));
if (dig_port->num_hdcp_streams > 0 && !hdcp2_link_recovery)
return 0;
}
ret = hdcp2_disable_encryption(connector);
if (hdcp2_deauthenticate_port(connector) < 0)
drm_dbg_kms(&i915->drm, "Port deauth failed.\n");
connector->hdcp.hdcp2_encrypted = false;
dig_port->hdcp_auth_status = false;
data->k = 0;
return ret;
}
/* Implements the Link Integrity Check for HDCP2.2 */
static int intel_hdcp2_check_link(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
enum port port = dig_port->base.port;
enum transcoder cpu_transcoder;
int ret = 0;
mutex_lock(&hdcp->mutex);
mutex_lock(&dig_port->hdcp_mutex);
cpu_transcoder = hdcp->cpu_transcoder;
/* hdcp2_check_link is expected only when HDCP2.2 is Enabled */
if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_ENABLED ||
!hdcp->hdcp2_encrypted) {
ret = -EINVAL;
goto out;
}
if (drm_WARN_ON(&dev_priv->drm,
!intel_hdcp2_in_use(dev_priv, cpu_transcoder, port))) {
drm_err(&dev_priv->drm,
"HDCP2.2 link stopped the encryption, %x\n",
intel_de_read(dev_priv, HDCP2_STATUS(dev_priv, cpu_transcoder, port)));
ret = -ENXIO;
_intel_hdcp2_disable(connector, true);
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_DESIRED,
true);
goto out;
}
ret = hdcp->shim->check_2_2_link(dig_port, connector);
if (ret == HDCP_LINK_PROTECTED) {
if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_ENABLED,
true);
}
goto out;
}
if (ret == HDCP_TOPOLOGY_CHANGE) {
if (hdcp->value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
goto out;
drm_dbg_kms(&dev_priv->drm,
"HDCP2.2 Downstream topology change\n");
ret = hdcp2_authenticate_repeater_topology(connector);
if (!ret) {
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_ENABLED,
true);
goto out;
}
drm_dbg_kms(&dev_priv->drm,
"[%s:%d] Repeater topology auth failed.(%d)\n",
connector->base.name, connector->base.base.id,
ret);
} else {
drm_dbg_kms(&dev_priv->drm,
"[%s:%d] HDCP2.2 link failed, retrying auth\n",
connector->base.name, connector->base.base.id);
}
ret = _intel_hdcp2_disable(connector, true);
if (ret) {
drm_err(&dev_priv->drm,
"[%s:%d] Failed to disable hdcp2.2 (%d)\n",
connector->base.name, connector->base.base.id, ret);
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_DESIRED, true);
goto out;
}
ret = _intel_hdcp2_enable(connector);
if (ret) {
drm_dbg_kms(&dev_priv->drm,
"[%s:%d] Failed to enable hdcp2.2 (%d)\n",
connector->base.name, connector->base.base.id,
ret);
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_DESIRED,
true);
goto out;
}
out:
mutex_unlock(&dig_port->hdcp_mutex);
mutex_unlock(&hdcp->mutex);
return ret;
}
static void intel_hdcp_check_work(struct work_struct *work)
{
struct intel_hdcp *hdcp = container_of(to_delayed_work(work),
struct intel_hdcp,
check_work);
struct intel_connector *connector = intel_hdcp_to_connector(hdcp);
if (drm_connector_is_unregistered(&connector->base))
return;
if (!intel_hdcp2_check_link(connector))
schedule_delayed_work(&hdcp->check_work,
DRM_HDCP2_CHECK_PERIOD_MS);
else if (!intel_hdcp_check_link(connector))
schedule_delayed_work(&hdcp->check_work,
DRM_HDCP_CHECK_PERIOD_MS);
}
static int i915_hdcp_component_bind(struct device *i915_kdev,
struct device *mei_kdev, void *data)
{
struct drm_i915_private *dev_priv = kdev_to_i915(i915_kdev);
drm_dbg(&dev_priv->drm, "I915 HDCP comp bind\n");
mutex_lock(&dev_priv->hdcp_comp_mutex);
dev_priv->hdcp_master = (struct i915_hdcp_comp_master *)data;
dev_priv->hdcp_master->mei_dev = mei_kdev;
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return 0;
}
static void i915_hdcp_component_unbind(struct device *i915_kdev,
struct device *mei_kdev, void *data)
{
struct drm_i915_private *dev_priv = kdev_to_i915(i915_kdev);
drm_dbg(&dev_priv->drm, "I915 HDCP comp unbind\n");
mutex_lock(&dev_priv->hdcp_comp_mutex);
dev_priv->hdcp_master = NULL;
mutex_unlock(&dev_priv->hdcp_comp_mutex);
}
static const struct component_ops i915_hdcp_component_ops = {
.bind = i915_hdcp_component_bind,
.unbind = i915_hdcp_component_unbind,
};
static enum mei_fw_ddi intel_get_mei_fw_ddi_index(enum port port)
{
switch (port) {
case PORT_A:
return MEI_DDI_A;
case PORT_B ... PORT_F:
return (enum mei_fw_ddi)port;
default:
return MEI_DDI_INVALID_PORT;
}
}
static enum mei_fw_tc intel_get_mei_fw_tc(enum transcoder cpu_transcoder)
{
switch (cpu_transcoder) {
case TRANSCODER_A ... TRANSCODER_D:
return (enum mei_fw_tc)(cpu_transcoder | 0x10);
default: /* eDP, DSI TRANSCODERS are non HDCP capable */
return MEI_INVALID_TRANSCODER;
}
}
static int initialize_hdcp_port_data(struct intel_connector *connector,
struct intel_digital_port *dig_port,
const struct intel_hdcp_shim *shim)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct hdcp_port_data *data = &dig_port->hdcp_port_data;
struct intel_hdcp *hdcp = &connector->hdcp;
enum port port = dig_port->base.port;
if (DISPLAY_VER(dev_priv) < 12)
data->fw_ddi = intel_get_mei_fw_ddi_index(port);
else
/*
* As per ME FW API expectation, for GEN 12+, fw_ddi is filled
* with zero(INVALID PORT index).
*/
data->fw_ddi = MEI_DDI_INVALID_PORT;
/*
* As associated transcoder is set and modified at modeset, here fw_tc
* is initialized to zero (invalid transcoder index). This will be
* retained for <Gen12 forever.
*/
data->fw_tc = MEI_INVALID_TRANSCODER;
data->port_type = (u8)HDCP_PORT_TYPE_INTEGRATED;
data->protocol = (u8)shim->protocol;
if (!data->streams)
data->streams = kcalloc(INTEL_NUM_PIPES(dev_priv),
sizeof(struct hdcp2_streamid_type),
GFP_KERNEL);
if (!data->streams) {
drm_err(&dev_priv->drm, "Out of Memory\n");
return -ENOMEM;
}
/* For SST */
data->streams[0].stream_id = 0;
data->streams[0].stream_type = hdcp->content_type;
return 0;
}
static bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
{
if (!IS_ENABLED(CONFIG_INTEL_MEI_HDCP))
return false;
return (DISPLAY_VER(dev_priv) >= 10 ||
IS_KABYLAKE(dev_priv) ||
IS_COFFEELAKE(dev_priv) ||
IS_COMETLAKE(dev_priv));
}
void intel_hdcp_component_init(struct drm_i915_private *dev_priv)
{
int ret;
if (!is_hdcp2_supported(dev_priv))
return;
mutex_lock(&dev_priv->hdcp_comp_mutex);
drm_WARN_ON(&dev_priv->drm, dev_priv->hdcp_comp_added);
dev_priv->hdcp_comp_added = true;
mutex_unlock(&dev_priv->hdcp_comp_mutex);
ret = component_add_typed(dev_priv->drm.dev, &i915_hdcp_component_ops,
I915_COMPONENT_HDCP);
if (ret < 0) {
drm_dbg_kms(&dev_priv->drm, "Failed at component add(%d)\n",
ret);
mutex_lock(&dev_priv->hdcp_comp_mutex);
dev_priv->hdcp_comp_added = false;
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return;
}
}
static void intel_hdcp2_init(struct intel_connector *connector,
struct intel_digital_port *dig_port,
const struct intel_hdcp_shim *shim)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
int ret;
ret = initialize_hdcp_port_data(connector, dig_port, shim);
if (ret) {
drm_dbg_kms(&i915->drm, "Mei hdcp data init failed\n");
return;
}
hdcp->hdcp2_supported = true;
}
int intel_hdcp_init(struct intel_connector *connector,
struct intel_digital_port *dig_port,
const struct intel_hdcp_shim *shim)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_hdcp *hdcp = &connector->hdcp;
int ret;
if (!shim)
return -EINVAL;
if (is_hdcp2_supported(dev_priv))
intel_hdcp2_init(connector, dig_port, shim);
ret =
drm_connector_attach_content_protection_property(&connector->base,
hdcp->hdcp2_supported);
if (ret) {
hdcp->hdcp2_supported = false;
kfree(dig_port->hdcp_port_data.streams);
return ret;
}
hdcp->shim = shim;
mutex_init(&hdcp->mutex);
INIT_DELAYED_WORK(&hdcp->check_work, intel_hdcp_check_work);
INIT_WORK(&hdcp->prop_work, intel_hdcp_prop_work);
init_waitqueue_head(&hdcp->cp_irq_queue);
return 0;
}
int intel_hdcp_enable(struct intel_connector *connector,
const struct intel_crtc_state *pipe_config, u8 content_type)
{
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct intel_hdcp *hdcp = &connector->hdcp;
unsigned long check_link_interval = DRM_HDCP_CHECK_PERIOD_MS;
int ret = -EINVAL;
if (!hdcp->shim)
return -ENOENT;
if (!connector->encoder) {
drm_err(&dev_priv->drm, "[%s:%d] encoder is not initialized\n",
connector->base.name, connector->base.base.id);
return -ENODEV;
}
mutex_lock(&hdcp->mutex);
mutex_lock(&dig_port->hdcp_mutex);
drm_WARN_ON(&dev_priv->drm,
hdcp->value == DRM_MODE_CONTENT_PROTECTION_ENABLED);
hdcp->content_type = content_type;
if (intel_crtc_has_type(pipe_config, INTEL_OUTPUT_DP_MST)) {
hdcp->cpu_transcoder = pipe_config->mst_master_transcoder;
hdcp->stream_transcoder = pipe_config->cpu_transcoder;
} else {
hdcp->cpu_transcoder = pipe_config->cpu_transcoder;
hdcp->stream_transcoder = INVALID_TRANSCODER;
}
if (DISPLAY_VER(dev_priv) >= 12)
dig_port->hdcp_port_data.fw_tc = intel_get_mei_fw_tc(hdcp->cpu_transcoder);
/*
* Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
* is capable of HDCP2.2, it is preferred to use HDCP2.2.
*/
if (intel_hdcp2_capable(connector)) {
ret = _intel_hdcp2_enable(connector);
if (!ret)
check_link_interval = DRM_HDCP2_CHECK_PERIOD_MS;
}
/*
* When HDCP2.2 fails and Content Type is not Type1, HDCP1.4 will
* be attempted.
*/
if (ret && intel_hdcp_capable(connector) &&
hdcp->content_type != DRM_MODE_HDCP_CONTENT_TYPE1) {
ret = _intel_hdcp_enable(connector);
}
if (!ret) {
schedule_delayed_work(&hdcp->check_work, check_link_interval);
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_ENABLED,
true);
}
mutex_unlock(&dig_port->hdcp_mutex);
mutex_unlock(&hdcp->mutex);
return ret;
}
int intel_hdcp_disable(struct intel_connector *connector)
{
struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
struct intel_hdcp *hdcp = &connector->hdcp;
int ret = 0;
if (!hdcp->shim)
return -ENOENT;
mutex_lock(&hdcp->mutex);
mutex_lock(&dig_port->hdcp_mutex);
if (hdcp->value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
goto out;
intel_hdcp_update_value(connector,
DRM_MODE_CONTENT_PROTECTION_UNDESIRED, false);
if (hdcp->hdcp2_encrypted)
ret = _intel_hdcp2_disable(connector, false);
else if (hdcp->hdcp_encrypted)
ret = _intel_hdcp_disable(connector);
out:
mutex_unlock(&dig_port->hdcp_mutex);
mutex_unlock(&hdcp->mutex);
cancel_delayed_work_sync(&hdcp->check_work);
return ret;
}
void intel_hdcp_update_pipe(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
struct intel_connector *connector =
to_intel_connector(conn_state->connector);
struct intel_hdcp *hdcp = &connector->hdcp;
bool content_protection_type_changed, desired_and_not_enabled = false;
if (!connector->hdcp.shim)
return;
content_protection_type_changed =
(conn_state->hdcp_content_type != hdcp->content_type &&
conn_state->content_protection !=
DRM_MODE_CONTENT_PROTECTION_UNDESIRED);
/*
* During the HDCP encryption session if Type change is requested,
* disable the HDCP and reenable it with new TYPE value.
*/
if (conn_state->content_protection ==
DRM_MODE_CONTENT_PROTECTION_UNDESIRED ||
content_protection_type_changed)
intel_hdcp_disable(connector);
/*
* Mark the hdcp state as DESIRED after the hdcp disable of type
* change procedure.
*/
if (content_protection_type_changed) {
mutex_lock(&hdcp->mutex);
hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED;
drm_connector_get(&connector->base);
schedule_work(&hdcp->prop_work);
mutex_unlock(&hdcp->mutex);
}
if (conn_state->content_protection ==
DRM_MODE_CONTENT_PROTECTION_DESIRED) {
mutex_lock(&hdcp->mutex);
/* Avoid enabling hdcp, if it already ENABLED */
desired_and_not_enabled =
hdcp->value != DRM_MODE_CONTENT_PROTECTION_ENABLED;
mutex_unlock(&hdcp->mutex);
/*
* If HDCP already ENABLED and CP property is DESIRED, schedule
* prop_work to update correct CP property to user space.
*/
if (!desired_and_not_enabled && !content_protection_type_changed) {
drm_connector_get(&connector->base);
schedule_work(&hdcp->prop_work);
}
}
if (desired_and_not_enabled || content_protection_type_changed)
intel_hdcp_enable(connector,
crtc_state,
(u8)conn_state->hdcp_content_type);
}
void intel_hdcp_component_fini(struct drm_i915_private *dev_priv)
{
mutex_lock(&dev_priv->hdcp_comp_mutex);
if (!dev_priv->hdcp_comp_added) {
mutex_unlock(&dev_priv->hdcp_comp_mutex);
return;
}
dev_priv->hdcp_comp_added = false;
mutex_unlock(&dev_priv->hdcp_comp_mutex);
component_del(dev_priv->drm.dev, &i915_hdcp_component_ops);
}
void intel_hdcp_cleanup(struct intel_connector *connector)
{
struct intel_hdcp *hdcp = &connector->hdcp;
if (!hdcp->shim)
return;
/*
* If the connector is registered, it's possible userspace could kick
* off another HDCP enable, which would re-spawn the workers.
*/
drm_WARN_ON(connector->base.dev,
connector->base.registration_state == DRM_CONNECTOR_REGISTERED);
/*
* Now that the connector is not registered, check_work won't be run,
* but cancel any outstanding instances of it
*/
cancel_delayed_work_sync(&hdcp->check_work);
/*
* We don't cancel prop_work in the same way as check_work since it
* requires connection_mutex which could be held while calling this
* function. Instead, we rely on the connector references grabbed before
* scheduling prop_work to ensure the connector is alive when prop_work
* is run. So if we're in the destroy path (which is where this
* function should be called), we're "guaranteed" that prop_work is not
* active (tl;dr This Should Never Happen).
*/
drm_WARN_ON(connector->base.dev, work_pending(&hdcp->prop_work));
mutex_lock(&hdcp->mutex);
hdcp->shim = NULL;
mutex_unlock(&hdcp->mutex);
}
void intel_hdcp_atomic_check(struct drm_connector *connector,
struct drm_connector_state *old_state,
struct drm_connector_state *new_state)
{
u64 old_cp = old_state->content_protection;
u64 new_cp = new_state->content_protection;
struct drm_crtc_state *crtc_state;
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;
}
crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
new_state->crtc);
/*
* Fix the HDCP uapi content protection state in case of modeset.
* FIXME: As per HDCP content protection property uapi doc, an uevent()
* need to be sent if there is transition from ENABLED->DESIRED.
*/
if (drm_atomic_crtc_needs_modeset(crtc_state) &&
(old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
new_state->content_protection =
DRM_MODE_CONTENT_PROTECTION_DESIRED;
/*
* Nothing to do if the state didn't change, or HDCP was activated since
* the last commit. And also no change in hdcp content type.
*/
if (old_cp == new_cp ||
(old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) {
if (old_state->hdcp_content_type ==
new_state->hdcp_content_type)
return;
}
crtc_state->mode_changed = true;
}
/* Handles the CP_IRQ raised from the DP HDCP sink */
void intel_hdcp_handle_cp_irq(struct intel_connector *connector)
{
struct intel_hdcp *hdcp = &connector->hdcp;
if (!hdcp->shim)
return;
atomic_inc(&connector->hdcp.cp_irq_count);
wake_up_all(&connector->hdcp.cp_irq_queue);
schedule_delayed_work(&hdcp->check_work, 0);
}
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