| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ramalingam C | 6710 | 73.80% | 34 | 69.39% |
| Sean Paul | 2321 | 25.53% | 3 | 6.12% |
| Radhakrishna Sripada | 18 | 0.20% | 1 | 2.04% |
| Daniele Ceraolo Spurio | 13 | 0.14% | 3 | 6.12% |
| Jani Nikula | 10 | 0.11% | 2 | 4.08% |
| Chris Wilson | 7 | 0.08% | 3 | 6.12% |
| Wei Yongjun | 6 | 0.07% | 1 | 2.04% |
| Imre Deak | 4 | 0.04% | 1 | 2.04% |
| Kees Cook | 3 | 0.03% | 1 | 2.04% |
| Total | 9092 | 49 |
/* SPDX-License-Identifier: MIT */ /* * Copyright (C) 2017 Google, Inc. * * Authors: * Sean Paul <seanpaul@chromium.org> */ #include <linux/component.h> #include <linux/i2c.h> #include <linux/random.h> #include <drm/drm_hdcp.h> #include <drm/i915_component.h> #include "i915_reg.h" #include "intel_display_power.h" #include "intel_display_types.h" #include "intel_hdcp.h" #include "intel_sideband.h" #define KEY_LOAD_TRIES 5 #define ENCRYPT_STATUS_CHANGE_TIMEOUT_MS 50 #define HDCP2_LC_RETRY_CNT 3 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 *intel_dig_port, const struct intel_hdcp_shim *shim, u8 *bksv) { 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(intel_dig_port, bksv); if (ret) return ret; if (intel_hdcp_is_ksv_valid(bksv)) break; } if (i == tries) { DRM_DEBUG_KMS("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 *intel_dig_port = conn_to_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(intel_dig_port, &capable); } else { if (!intel_hdcp_read_valid_bksv(intel_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 drm_i915_private *dev_priv = to_i915(connector->base.dev); struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); 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(intel_dig_port, &capable); return capable; } static inline bool intel_hdcp_in_use(struct intel_connector *connector) { struct drm_i915_private *dev_priv = to_i915(connector->base.dev); enum port port = connector->encoder->port; u32 reg; reg = I915_READ(PORT_HDCP_STATUS(port)); return reg & HDCP_STATUS_ENC; } static inline bool intel_hdcp2_in_use(struct intel_connector *connector) { struct drm_i915_private *dev_priv = to_i915(connector->base.dev); enum port port = connector->encoder->port; u32 reg; reg = I915_READ(HDCP2_STATUS_DDI(port)); return reg & LINK_ENCRYPTION_STATUS; } 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; /* Poll for ksv list ready (spec says max time allowed is 5s) */ ret = __wait_for(read_ret = shim->read_ksv_ready(intel_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) { struct i915_power_domains *power_domains = &dev_priv->power_domains; struct i915_power_well *power_well; enum i915_power_well_id id; 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; mutex_lock(&power_domains->lock); /* PG1 (power well #1) needs to be enabled */ for_each_power_well(dev_priv, power_well) { if (power_well->desc->id == id) { enabled = power_well->desc->ops->is_enabled(dev_priv, power_well); break; } } mutex_unlock(&power_domains->lock); /* * 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) { I915_WRITE(HDCP_KEY_CONF, HDCP_CLEAR_KEYS_TRIGGER); I915_WRITE(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 = I915_READ(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 (!(I915_READ(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 Gen 9 * platforms except BXT and GLK, differ in the key load trigger process * from other platforms. So GEN9_BC uses the GT Driver Mailbox i/f. */ if (IS_GEN9_BC(dev_priv)) { ret = sandybridge_pcode_write(dev_priv, SKL_PCODE_LOAD_HDCP_KEYS, 1); if (ret) { DRM_ERROR("Failed to initiate HDCP key load (%d)\n", ret); return ret; } } else { I915_WRITE(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 */ I915_WRITE(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) { I915_WRITE(HDCP_SHA_TEXT, sha_text); if (intel_de_wait_for_set(dev_priv, HDCP_REP_CTL, 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 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: break; } DRM_ERROR("Unknown port %d\n", port); return -EINVAL; } static int intel_hdcp_validate_v_prime(struct intel_digital_port *intel_dig_port, const struct intel_hdcp_shim *shim, u8 *ksv_fifo, u8 num_downstream, u8 *bstatus) { struct drm_i915_private *dev_priv; u32 vprime, sha_text, sha_leftovers, rep_ctl; int ret, i, j, sha_idx; dev_priv = intel_dig_port->base.base.dev->dev_private; /* 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(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(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++) 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(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 */ I915_WRITE(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 */ I915_WRITE(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 */ I915_WRITE(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 */ I915_WRITE(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 */ I915_WRITE(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 */ I915_WRITE(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 */ I915_WRITE(HDCP_REP_CTL, rep_ctl | 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(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); } } else if (sha_leftovers == 3) { /* Write 32 bits of text */ I915_WRITE(HDCP_REP_CTL, rep_ctl | 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(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 */ I915_WRITE(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 */ I915_WRITE(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_DEBUG_KMS("Invalid number of leftovers %d\n", sha_leftovers); return -EINVAL; } I915_WRITE(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 */ I915_WRITE(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_ERROR("Timed out waiting for SHA1 complete\n"); return -ETIMEDOUT; } if (!(I915_READ(HDCP_REP_CTL) & HDCP_SHA1_V_MATCH)) { DRM_DEBUG_KMS("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 *intel_dig_port = conn_to_dig_port(connector); const struct intel_hdcp_shim *shim = connector->hdcp.shim; struct drm_device *dev = connector->base.dev; u8 bstatus[2], num_downstream, *ksv_fifo; int ret, i, tries = 3; ret = intel_hdcp_poll_ksv_fifo(intel_dig_port, shim); if (ret) { DRM_DEBUG_KMS("KSV list failed to become ready (%d)\n", ret); return ret; } ret = shim->read_bstatus(intel_dig_port, bstatus); if (ret) return ret; if (DRM_HDCP_MAX_DEVICE_EXCEEDED(bstatus[0]) || DRM_HDCP_MAX_CASCADE_EXCEEDED(bstatus[1])) { DRM_DEBUG_KMS("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_DEBUG_KMS("Repeater with zero downstream devices\n"); return -EINVAL; } ksv_fifo = kcalloc(DRM_HDCP_KSV_LEN, num_downstream, GFP_KERNEL); if (!ksv_fifo) { DRM_DEBUG_KMS("Out of mem: ksv_fifo\n"); return -ENOMEM; } ret = shim->read_ksv_fifo(intel_dig_port, num_downstream, ksv_fifo); if (ret) goto err; if (drm_hdcp_check_ksvs_revoked(dev, ksv_fifo, num_downstream)) { DRM_ERROR("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(intel_dig_port, shim, ksv_fifo, num_downstream, bstatus); if (!ret) break; } if (i == tries) { DRM_DEBUG_KMS("V Prime validation failed.(%d)\n", ret); goto err; } DRM_DEBUG_KMS("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 *intel_dig_port = conn_to_dig_port(connector); struct intel_hdcp *hdcp = &connector->hdcp; struct drm_device *dev = connector->base.dev; const struct intel_hdcp_shim *shim = hdcp->shim; struct drm_i915_private *dev_priv; enum port 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; dev_priv = intel_dig_port->base.base.dev->dev_private; port = intel_dig_port->base.port; /* * 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(intel_dig_port, &hdcp_capable); if (ret) return ret; if (!hdcp_capable) { DRM_DEBUG_KMS("Panel is not HDCP capable\n"); return -EINVAL; } } /* Initialize An with 2 random values and acquire it */ for (i = 0; i < 2; i++) I915_WRITE(PORT_HDCP_ANINIT(port), get_random_u32()); I915_WRITE(PORT_HDCP_CONF(port), HDCP_CONF_CAPTURE_AN); /* Wait for An to be acquired */ if (intel_de_wait_for_set(dev_priv, PORT_HDCP_STATUS(port), HDCP_STATUS_AN_READY, 1)) { DRM_ERROR("Timed out waiting for An\n"); return -ETIMEDOUT; } an.reg[0] = I915_READ(PORT_HDCP_ANLO(port)); an.reg[1] = I915_READ(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 = intel_hdcp_read_valid_bksv(intel_dig_port, shim, bksv.shim); if (ret < 0) return ret; if (drm_hdcp_check_ksvs_revoked(dev, bksv.shim, 1)) { DRM_ERROR("BKSV is revoked\n"); return -EPERM; } I915_WRITE(PORT_HDCP_BKSVLO(port), bksv.reg[0]); I915_WRITE(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(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(PORT_HDCP_CONF(port), HDCP_CONF_AUTH_AND_ENC); /* Wait for R0 ready */ if (wait_for(I915_READ(PORT_HDCP_STATUS(port)) & (HDCP_STATUS_R0_READY | 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, 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(intel_dig_port, ri.shim); if (ret) return ret; I915_WRITE(PORT_HDCP_RPRIME(port), ri.reg); /* Wait for Ri prime match */ if (!wait_for(I915_READ(PORT_HDCP_STATUS(port)) & (HDCP_STATUS_RI_MATCH | HDCP_STATUS_ENC), 1)) break; } if (i == tries) { DRM_DEBUG_KMS("Timed out waiting for Ri prime match (%x)\n", I915_READ(PORT_HDCP_STATUS(port))); return -ETIMEDOUT; } /* Wait for encryption confirmation */ if (intel_de_wait_for_set(dev_priv, PORT_HDCP_STATUS(port), HDCP_STATUS_ENC, ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) { 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. */ if (repeater_present) return intel_hdcp_auth_downstream(connector); DRM_DEBUG_KMS("HDCP is enabled (no repeater present)\n"); return 0; } static int _intel_hdcp_disable(struct intel_connector *connector) { struct intel_hdcp *hdcp = &connector->hdcp; 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; DRM_DEBUG_KMS("[%s:%d] HDCP is being disabled...\n", connector->base.name, connector->base.base.id); hdcp->hdcp_encrypted = false; I915_WRITE(PORT_HDCP_CONF(port), 0); if (intel_de_wait_for_clear(dev_priv, PORT_HDCP_STATUS(port), ~0, ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) { DRM_ERROR("Failed to disable HDCP, timeout clearing status\n"); return -ETIMEDOUT; } ret = hdcp->shim->toggle_signalling(intel_dig_port, false); if (ret) { DRM_ERROR("Failed to disable HDCP signalling\n"); return ret; } DRM_DEBUG_KMS("HDCP is disabled\n"); return 0; } static int _intel_hdcp_enable(struct intel_connector *connector) { struct intel_hdcp *hdcp = &connector->hdcp; struct drm_i915_private *dev_priv = connector->base.dev->dev_private; int i, ret, tries = 3; DRM_DEBUG_KMS("[%s:%d] HDCP is being enabled...\n", connector->base.name, connector->base.base.id); if (!hdcp_key_loadable(dev_priv)) { DRM_ERROR("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_ERROR("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_DEBUG_KMS("HDCP Auth failure (%d)\n", ret); /* Ensuring HDCP encryption and signalling are stopped. */ _intel_hdcp_disable(connector); } DRM_DEBUG_KMS("HDCP authentication failed (%d tries/%d)\n", tries, ret); return ret; } static inline struct intel_connector *intel_hdcp_to_connector(struct intel_hdcp *hdcp) { return container_of(hdcp, struct intel_connector, hdcp); } /* Implements Part 3 of the HDCP authorization procedure */ static int intel_hdcp_check_link(struct intel_connector *connector) { struct intel_hdcp *hdcp = &connector->hdcp; 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; mutex_lock(&hdcp->mutex); /* 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 (WARN_ON(!intel_hdcp_in_use(connector))) { DRM_ERROR("%s:%d HDCP link stopped encryption,%x\n", connector->base.name, connector->base.base.id, I915_READ(PORT_HDCP_STATUS(port))); ret = -ENXIO; hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED; schedule_work(&hdcp->prop_work); goto out; } if (hdcp->shim->check_link(intel_dig_port)) { if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED; schedule_work(&hdcp->prop_work); } goto out; } DRM_DEBUG_KMS("[%s:%d] HDCP link failed, retrying authentication\n", connector->base.name, connector->base.base.id); ret = _intel_hdcp_disable(connector); if (ret) { DRM_ERROR("Failed to disable hdcp (%d)\n", ret); hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED; schedule_work(&hdcp->prop_work); goto out; } ret = _intel_hdcp_enable(connector); if (ret) { DRM_ERROR("Failed to enable hdcp (%d)\n", ret); hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED; schedule_work(&hdcp->prop_work); goto out; } out: 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_device *dev = connector->base.dev; drm_modeset_lock(&dev->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->mode_config.connection_mutex); } bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port) { /* PORT E doesn't have HDCP, and PORT F is disabled */ return INTEL_GEN(dev_priv) >= 9 && port < PORT_E; } static int hdcp2_prepare_ake_init(struct intel_connector *connector, struct hdcp2_ake_init *ake_data) { struct hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 hdcp_port_data *data = &connector->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_DEBUG_KMS("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 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, &connector->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 *intel_dig_port = conn_to_dig_port(connector); struct intel_hdcp *hdcp = &connector->hdcp; struct drm_device *dev = connector->base.dev; 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(intel_dig_port, &msgs.ake_init, sizeof(msgs.ake_init)); if (ret < 0) return ret; ret = shim->read_2_2_msg(intel_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_DEBUG_KMS("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, msgs.send_cert.cert_rx.receiver_id, 1)) { DRM_ERROR("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(intel_dig_port, &msgs.no_stored_km, size); if (ret < 0) return ret; ret = shim->read_2_2_msg(intel_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(intel_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 *intel_dig_port = conn_to_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(intel_dig_port, &msgs.lc_init, sizeof(msgs.lc_init)); if (ret < 0) continue; ret = shim->read_2_2_msg(intel_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 *intel_dig_port = conn_to_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(intel_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 *intel_dig_port = conn_to_dig_port(connector); 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; /* 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); /* K no of streams is fixed as 1. Stored as big-endian. */ msgs.stream_manage.k = cpu_to_be16(1); /* For HDMI this is forced to be 0x0. For DP SST also this is 0x0. */ msgs.stream_manage.streams[0].stream_id = 0; msgs.stream_manage.streams[0].stream_type = hdcp->content_type; /* Send it to Repeater */ ret = shim->write_2_2_msg(intel_dig_port, &msgs.stream_manage, sizeof(msgs.stream_manage)); if (ret < 0) return ret; ret = shim->read_2_2_msg(intel_dig_port, HDCP_2_2_REP_STREAM_READY, &msgs.stream_ready, sizeof(msgs.stream_ready)); if (ret < 0) return ret; hdcp->port_data.seq_num_m = hdcp->seq_num_m; hdcp->port_data.streams[0].stream_type = hdcp->content_type; ret = hdcp2_verify_mprime(connector, &msgs.stream_ready); if (ret < 0) return ret; hdcp->seq_num_m++; if (hdcp->seq_num_m > HDCP_2_2_SEQ_NUM_MAX) { DRM_DEBUG_KMS("seq_num_m roll over.\n"); return -1; } return 0; } static int hdcp2_authenticate_repeater_topology(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); struct intel_hdcp *hdcp = &connector->hdcp; struct drm_device *dev = connector->base.dev; 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(intel_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_DEBUG_KMS("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 (seq_num_v < hdcp->seq_num_v) { /* Roll over of the seq_num_v from repeater. Reauthenticate. */ DRM_DEBUG_KMS("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, msgs.recvid_list.receiver_ids, device_cnt)) { DRM_ERROR("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(intel_dig_port, &msgs.rep_ack, sizeof(msgs.rep_ack)); if (ret < 0) return ret; return 0; } static int hdcp2_authenticate_repeater(struct intel_connector *connector) { int ret; ret = hdcp2_authenticate_repeater_topology(connector); if (ret < 0) return ret; return hdcp2_propagate_stream_management_info(connector); } static int hdcp2_authenticate_sink(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); 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_DEBUG_KMS("AKE Failed. Err : %d\n", ret); return ret; } ret = hdcp2_locality_check(connector); if (ret < 0) { DRM_DEBUG_KMS("Locality Check failed. Err : %d\n", ret); return ret; } ret = hdcp2_session_key_exchange(connector); if (ret < 0) { DRM_DEBUG_KMS("SKE Failed. Err : %d\n", ret); return ret; } if (shim->config_stream_type) { ret = shim->config_stream_type(intel_dig_port, hdcp->is_repeater, hdcp->content_type); if (ret < 0) return ret; } if (hdcp->is_repeater) { ret = hdcp2_authenticate_repeater(connector); if (ret < 0) { DRM_DEBUG_KMS("Repeater Auth Failed. Err: %d\n", ret); return ret; } } hdcp->port_data.streams[0].stream_type = hdcp->content_type; ret = hdcp2_authenticate_port(connector); if (ret < 0) return ret; return ret; } static int hdcp2_enable_encryption(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); struct drm_i915_private *dev_priv = to_i915(connector->base.dev); struct intel_hdcp *hdcp = &connector->hdcp; enum port port = connector->encoder->port; int ret; WARN_ON(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS); if (hdcp->shim->toggle_signalling) { ret = hdcp->shim->toggle_signalling(intel_dig_port, true); if (ret) { DRM_ERROR("Failed to enable HDCP signalling. %d\n", ret); return ret; } } if (I915_READ(HDCP2_STATUS_DDI(port)) & LINK_AUTH_STATUS) { /* Link is Authenticated. Now set for Encryption */ I915_WRITE(HDCP2_CTL_DDI(port), I915_READ(HDCP2_CTL_DDI(port)) | CTL_LINK_ENCRYPTION_REQ); } ret = intel_de_wait_for_set(dev_priv, HDCP2_STATUS_DDI(port), LINK_ENCRYPTION_STATUS, ENCRYPT_STATUS_CHANGE_TIMEOUT_MS); return ret; } static int hdcp2_disable_encryption(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); struct drm_i915_private *dev_priv = to_i915(connector->base.dev); struct intel_hdcp *hdcp = &connector->hdcp; enum port port = connector->encoder->port; int ret; WARN_ON(!(I915_READ(HDCP2_STATUS_DDI(port)) & LINK_ENCRYPTION_STATUS)); I915_WRITE(HDCP2_CTL_DDI(port), I915_READ(HDCP2_CTL_DDI(port)) & ~CTL_LINK_ENCRYPTION_REQ); ret = intel_de_wait_for_clear(dev_priv, HDCP2_STATUS_DDI(port), LINK_ENCRYPTION_STATUS, ENCRYPT_STATUS_CHANGE_TIMEOUT_MS); if (ret == -ETIMEDOUT) DRM_DEBUG_KMS("Disable Encryption Timedout"); if (hdcp->shim->toggle_signalling) { ret = hdcp->shim->toggle_signalling(intel_dig_port, false); if (ret) { DRM_ERROR("Failed to disable HDCP signalling. %d\n", ret); return ret; } } return ret; } static int hdcp2_authenticate_and_encrypt(struct intel_connector *connector) { int ret, i, tries = 3; for (i = 0; i < tries; i++) { ret = hdcp2_authenticate_sink(connector); if (!ret) break; /* Clearing the mei hdcp session */ DRM_DEBUG_KMS("HDCP2.2 Auth %d of %d Failed.(%d)\n", i + 1, tries, ret); if (hdcp2_deauthenticate_port(connector) < 0) DRM_DEBUG_KMS("Port deauth failed.\n"); } if (i != tries) { /* * 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_DEBUG_KMS("Encryption Enable Failed.(%d)\n", ret); if (hdcp2_deauthenticate_port(connector) < 0) DRM_DEBUG_KMS("Port deauth failed.\n"); } } return ret; } static int _intel_hdcp2_enable(struct intel_connector *connector) { struct intel_hdcp *hdcp = &connector->hdcp; int ret; DRM_DEBUG_KMS("[%s:%d] HDCP2.2 is being enabled. Type: %d\n", connector->base.name, connector->base.base.id, hdcp->content_type); ret = hdcp2_authenticate_and_encrypt(connector); if (ret) { DRM_DEBUG_KMS("HDCP2 Type%d Enabling Failed. (%d)\n", hdcp->content_type, ret); return ret; } DRM_DEBUG_KMS("[%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) { int ret; DRM_DEBUG_KMS("[%s:%d] HDCP2.2 is being Disabled\n", connector->base.name, connector->base.base.id); ret = hdcp2_disable_encryption(connector); if (hdcp2_deauthenticate_port(connector) < 0) DRM_DEBUG_KMS("Port deauth failed.\n"); connector->hdcp.hdcp2_encrypted = false; return ret; } /* Implements the Link Integrity Check for HDCP2.2 */ static int intel_hdcp2_check_link(struct intel_connector *connector) { struct intel_digital_port *intel_dig_port = conn_to_dig_port(connector); struct drm_i915_private *dev_priv = to_i915(connector->base.dev); struct intel_hdcp *hdcp = &connector->hdcp; enum port port = connector->encoder->port; int ret = 0; mutex_lock(&hdcp->mutex); /* 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 (WARN_ON(!intel_hdcp2_in_use(connector))) { DRM_ERROR("HDCP2.2 link stopped the encryption, %x\n", I915_READ(HDCP2_STATUS_DDI(port))); ret = -ENXIO; hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED; schedule_work(&hdcp->prop_work); goto out; } ret = hdcp->shim->check_2_2_link(intel_dig_port); if (ret == HDCP_LINK_PROTECTED) { if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED; schedule_work(&hdcp->prop_work); } goto out; } if (ret == HDCP_TOPOLOGY_CHANGE) { if (hdcp->value == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) goto out; DRM_DEBUG_KMS("HDCP2.2 Downstream topology change\n"); ret = hdcp2_authenticate_repeater_topology(connector); if (!ret) { hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED; schedule_work(&hdcp->prop_work); goto out; } DRM_DEBUG_KMS("[%s:%d] Repeater topology auth failed.(%d)\n", connector->base.name, connector->base.base.id, ret); } else { DRM_DEBUG_KMS("[%s:%d] HDCP2.2 link failed, retrying auth\n", connector->base.name, connector->base.base.id); } ret = _intel_hdcp2_disable(connector); if (ret) { DRM_ERROR("[%s:%d] Failed to disable hdcp2.2 (%d)\n", connector->base.name, connector->base.base.id, ret); hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED; schedule_work(&hdcp->prop_work); goto out; } ret = _intel_hdcp2_enable(connector); if (ret) { DRM_DEBUG_KMS("[%s:%d] Failed to enable hdcp2.2 (%d)\n", connector->base.name, connector->base.base.id, ret); hdcp->value = DRM_MODE_CONTENT_PROTECTION_DESIRED; schedule_work(&hdcp->prop_work); goto out; } out: 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 (!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_DEBUG("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_DEBUG("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 inline int initialize_hdcp_port_data(struct intel_connector *connector, const struct intel_hdcp_shim *shim) { struct intel_hdcp *hdcp = &connector->hdcp; struct hdcp_port_data *data = &hdcp->port_data; data->port = connector->encoder->port; data->port_type = (u8)HDCP_PORT_TYPE_INTEGRATED; data->protocol = (u8)shim->protocol; data->k = 1; if (!data->streams) data->streams = kcalloc(data->k, sizeof(struct hdcp2_streamid_type), GFP_KERNEL); if (!data->streams) { DRM_ERROR("Out of Memory\n"); return -ENOMEM; } 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 (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) || IS_KABYLAKE(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); WARN_ON(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_DEBUG_KMS("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, const struct intel_hdcp_shim *shim) { struct intel_hdcp *hdcp = &connector->hdcp; int ret; ret = initialize_hdcp_port_data(connector, shim); if (ret) { DRM_DEBUG_KMS("Mei hdcp data init failed\n"); return; } hdcp->hdcp2_supported = true; } int intel_hdcp_init(struct intel_connector *connector, 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, shim); ret = drm_connector_attach_content_protection_property(&connector->base, hdcp->hdcp2_supported); if (ret) { hdcp->hdcp2_supported = false; kfree(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, u8 content_type) { struct intel_hdcp *hdcp = &connector->hdcp; unsigned long check_link_interval = DRM_HDCP_CHECK_PERIOD_MS; int ret = -EINVAL; if (!hdcp->shim) return -ENOENT; mutex_lock(&hdcp->mutex); WARN_ON(hdcp->value == DRM_MODE_CONTENT_PROTECTION_ENABLED); hdcp->content_type = content_type; /* * 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); hdcp->value = DRM_MODE_CONTENT_PROTECTION_ENABLED; schedule_work(&hdcp->prop_work); } mutex_unlock(&hdcp->mutex); return ret; } int intel_hdcp_disable(struct intel_connector *connector) { struct intel_hdcp *hdcp = &connector->hdcp; int ret = 0; if (!hdcp->shim) return -ENOENT; mutex_lock(&hdcp->mutex); if (hdcp->value != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { hdcp->value = DRM_MODE_CONTENT_PROTECTION_UNDESIRED; if (hdcp->hdcp2_encrypted) ret = _intel_hdcp2_disable(connector); else if (hdcp->hdcp_encrypted) ret = _intel_hdcp_disable(connector); } mutex_unlock(&hdcp->mutex); cancel_delayed_work_sync(&hdcp->check_work); return ret; } 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) { if (!connector->hdcp.shim) return; mutex_lock(&connector->hdcp.mutex); kfree(connector->hdcp.port_data.streams); mutex_unlock(&connector->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; } /* * 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 = drm_atomic_get_new_crtc_state(new_state->state, new_state->crtc); 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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