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// SPDX-License-Identifier: MIT
/*
* Copyright 2023, Intel Corporation.
*/
#include <drm/i915_hdcp_interface.h>
#include "gem/i915_gem_region.h"
#include "gt/intel_gt.h"
#include "gt/uc/intel_gsc_uc_heci_cmd_submit.h"
#include "i915_drv.h"
#include "i915_utils.h"
#include "intel_hdcp_gsc.h"
#include "intel_hdcp_gsc_message.h"
struct intel_hdcp_gsc_message {
struct i915_vma *vma;
void *hdcp_cmd_in;
void *hdcp_cmd_out;
};
bool intel_hdcp_gsc_cs_required(struct drm_i915_private *i915)
{
return DISPLAY_VER(i915) >= 14;
}
bool intel_hdcp_gsc_check_status(struct drm_i915_private *i915)
{
struct intel_gt *gt = i915->media_gt;
struct intel_gsc_uc *gsc = gt ? >->uc.gsc : NULL;
if (!gsc || !intel_uc_fw_is_running(&gsc->fw)) {
drm_dbg_kms(&i915->drm,
"GSC components required for HDCP2.2 are not ready\n");
return false;
}
return true;
}
/*This function helps allocate memory for the command that we will send to gsc cs */
static int intel_hdcp_gsc_initialize_message(struct drm_i915_private *i915,
struct intel_hdcp_gsc_message *hdcp_message)
{
struct intel_gt *gt = i915->media_gt;
struct drm_i915_gem_object *obj = NULL;
struct i915_vma *vma = NULL;
void *cmd_in, *cmd_out;
int err;
/* allocate object of two page for HDCP command memory and store it */
obj = i915_gem_object_create_shmem(i915, 2 * PAGE_SIZE);
if (IS_ERR(obj)) {
drm_err(&i915->drm, "Failed to allocate HDCP streaming command!\n");
return PTR_ERR(obj);
}
cmd_in = i915_gem_object_pin_map_unlocked(obj, intel_gt_coherent_map_type(gt, obj, true));
if (IS_ERR(cmd_in)) {
drm_err(&i915->drm, "Failed to map gsc message page!\n");
err = PTR_ERR(cmd_in);
goto out_unpin;
}
cmd_out = cmd_in + PAGE_SIZE;
vma = i915_vma_instance(obj, >->ggtt->vm, NULL);
if (IS_ERR(vma)) {
err = PTR_ERR(vma);
goto out_unmap;
}
err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL | PIN_HIGH);
if (err)
goto out_unmap;
memset(cmd_in, 0, obj->base.size);
hdcp_message->hdcp_cmd_in = cmd_in;
hdcp_message->hdcp_cmd_out = cmd_out;
hdcp_message->vma = vma;
return 0;
out_unmap:
i915_gem_object_unpin_map(obj);
out_unpin:
i915_gem_object_put(obj);
return err;
}
static const struct i915_hdcp_ops gsc_hdcp_ops = {
.initiate_hdcp2_session = intel_hdcp_gsc_initiate_session,
.verify_receiver_cert_prepare_km =
intel_hdcp_gsc_verify_receiver_cert_prepare_km,
.verify_hprime = intel_hdcp_gsc_verify_hprime,
.store_pairing_info = intel_hdcp_gsc_store_pairing_info,
.initiate_locality_check = intel_hdcp_gsc_initiate_locality_check,
.verify_lprime = intel_hdcp_gsc_verify_lprime,
.get_session_key = intel_hdcp_gsc_get_session_key,
.repeater_check_flow_prepare_ack =
intel_hdcp_gsc_repeater_check_flow_prepare_ack,
.verify_mprime = intel_hdcp_gsc_verify_mprime,
.enable_hdcp_authentication = intel_hdcp_gsc_enable_authentication,
.close_hdcp_session = intel_hdcp_gsc_close_session,
};
static int intel_hdcp_gsc_hdcp2_init(struct drm_i915_private *i915)
{
struct intel_hdcp_gsc_message *hdcp_message;
int ret;
hdcp_message = kzalloc(sizeof(*hdcp_message), GFP_KERNEL);
if (!hdcp_message)
return -ENOMEM;
/*
* NOTE: No need to lock the comp mutex here as it is already
* going to be taken before this function called
*/
i915->display.hdcp.hdcp_message = hdcp_message;
ret = intel_hdcp_gsc_initialize_message(i915, hdcp_message);
if (ret)
drm_err(&i915->drm, "Could not initialize hdcp_message\n");
return ret;
}
static void intel_hdcp_gsc_free_message(struct drm_i915_private *i915)
{
struct intel_hdcp_gsc_message *hdcp_message =
i915->display.hdcp.hdcp_message;
hdcp_message->hdcp_cmd_in = NULL;
hdcp_message->hdcp_cmd_out = NULL;
i915_vma_unpin_and_release(&hdcp_message->vma, I915_VMA_RELEASE_MAP);
kfree(hdcp_message);
}
int intel_hdcp_gsc_init(struct drm_i915_private *i915)
{
struct i915_hdcp_arbiter *data;
int ret;
data = kzalloc(sizeof(struct i915_hdcp_arbiter), GFP_KERNEL);
if (!data)
return -ENOMEM;
mutex_lock(&i915->display.hdcp.hdcp_mutex);
i915->display.hdcp.arbiter = data;
i915->display.hdcp.arbiter->hdcp_dev = i915->drm.dev;
i915->display.hdcp.arbiter->ops = &gsc_hdcp_ops;
ret = intel_hdcp_gsc_hdcp2_init(i915);
mutex_unlock(&i915->display.hdcp.hdcp_mutex);
return ret;
}
void intel_hdcp_gsc_fini(struct drm_i915_private *i915)
{
intel_hdcp_gsc_free_message(i915);
kfree(i915->display.hdcp.arbiter);
}
static int intel_gsc_send_sync(struct drm_i915_private *i915,
struct intel_gsc_mtl_header *header_in,
struct intel_gsc_mtl_header *header_out,
u64 addr_in, u64 addr_out,
size_t msg_out_len)
{
struct intel_gt *gt = i915->media_gt;
int ret;
ret = intel_gsc_uc_heci_cmd_submit_packet(>->uc.gsc, addr_in,
header_in->message_size,
addr_out,
msg_out_len + sizeof(*header_out));
if (ret) {
drm_err(&i915->drm, "failed to send gsc HDCP msg (%d)\n", ret);
return ret;
}
/*
* Checking validity marker and header status to see if some error has
* blocked us from sending message to gsc cs
*/
if (header_out->validity_marker != GSC_HECI_VALIDITY_MARKER) {
drm_err(&i915->drm, "invalid validity marker\n");
return -EINVAL;
}
if (header_out->status != 0) {
drm_err(&i915->drm, "header status indicates error %d\n",
header_out->status);
return -EINVAL;
}
if (header_out->flags & GSC_OUTFLAG_MSG_PENDING) {
header_in->gsc_message_handle = header_out->gsc_message_handle;
return -EAGAIN;
}
return 0;
}
/*
* This function can now be used for sending requests and will also handle
* receipt of reply messages hence no different function of message retrieval
* is required. We will initialize intel_hdcp_gsc_message structure then add
* gsc cs memory header as stated in specs after which the normal HDCP payload
* will follow
*/
ssize_t intel_hdcp_gsc_msg_send(struct drm_i915_private *i915, u8 *msg_in,
size_t msg_in_len, u8 *msg_out,
size_t msg_out_len)
{
struct intel_gt *gt = i915->media_gt;
struct intel_gsc_mtl_header *header_in, *header_out;
const size_t max_msg_size = PAGE_SIZE - sizeof(*header_in);
struct intel_hdcp_gsc_message *hdcp_message;
u64 addr_in, addr_out, host_session_id;
u32 reply_size, msg_size_in, msg_size_out;
int ret, tries = 0;
if (!intel_uc_uses_gsc_uc(>->uc))
return -ENODEV;
if (msg_in_len > max_msg_size || msg_out_len > max_msg_size)
return -ENOSPC;
msg_size_in = msg_in_len + sizeof(*header_in);
msg_size_out = msg_out_len + sizeof(*header_out);
hdcp_message = i915->display.hdcp.hdcp_message;
header_in = hdcp_message->hdcp_cmd_in;
header_out = hdcp_message->hdcp_cmd_out;
addr_in = i915_ggtt_offset(hdcp_message->vma);
addr_out = addr_in + PAGE_SIZE;
memset(header_in, 0, msg_size_in);
memset(header_out, 0, msg_size_out);
get_random_bytes(&host_session_id, sizeof(u64));
intel_gsc_uc_heci_cmd_emit_mtl_header(header_in, HECI_MEADDRESS_HDCP,
msg_size_in, host_session_id);
memcpy(hdcp_message->hdcp_cmd_in + sizeof(*header_in), msg_in, msg_in_len);
/*
* Keep sending request in case the pending bit is set no need to add
* message handle as we are using same address hence loc. of header is
* same and it will contain the message handle. we will send the message
* 20 times each message 50 ms apart
*/
do {
ret = intel_gsc_send_sync(i915, header_in, header_out, addr_in,
addr_out, msg_out_len);
/* Only try again if gsc says so */
if (ret != -EAGAIN)
break;
msleep(50);
} while (++tries < 20);
if (ret)
goto err;
/* we use the same mem for the reply, so header is in the same loc */
reply_size = header_out->message_size - sizeof(*header_out);
if (reply_size > msg_out_len) {
drm_warn(&i915->drm, "caller with insufficient HDCP reply size %u (%d)\n",
reply_size, (u32)msg_out_len);
reply_size = msg_out_len;
} else if (reply_size != msg_out_len) {
drm_dbg_kms(&i915->drm, "caller unexpected HCDP reply size %u (%d)\n",
reply_size, (u32)msg_out_len);
}
memcpy(msg_out, hdcp_message->hdcp_cmd_out + sizeof(*header_out), msg_out_len);
err:
return ret;
}
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