diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_hdcp_gsc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_hdcp_gsc.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c b/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c new file mode 100644 index 000000000000..3e7b480ee9f1 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_hdcp_gsc.c @@ -0,0 +1,239 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright 2023, Intel Corporation. + */ + +#include <drm/drm_print.h> +#include <drm/intel/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 "intel_hdcp_gsc.h" + +struct intel_hdcp_gsc_context { + struct drm_i915_private *i915; + struct i915_vma *vma; + void *hdcp_cmd_in; + void *hdcp_cmd_out; +}; + +bool intel_hdcp_gsc_check_status(struct drm_device *drm) +{ + struct drm_i915_private *i915 = to_i915(drm); + 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_context *gsc_context) +{ + 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); + + gsc_context->hdcp_cmd_in = cmd_in; + gsc_context->hdcp_cmd_out = cmd_out; + gsc_context->vma = vma; + gsc_context->i915 = i915; + + return 0; + +out_unmap: + i915_gem_object_unpin_map(obj); +out_unpin: + i915_gem_object_put(obj); + return err; +} + +struct intel_hdcp_gsc_context *intel_hdcp_gsc_context_alloc(struct drm_device *drm) +{ + struct drm_i915_private *i915 = to_i915(drm); + struct intel_hdcp_gsc_context *gsc_context; + int ret; + + gsc_context = kzalloc(sizeof(*gsc_context), GFP_KERNEL); + if (!gsc_context) + return ERR_PTR(-ENOMEM); + + /* + * NOTE: No need to lock the comp mutex here as it is already + * going to be taken before this function called + */ + ret = intel_hdcp_gsc_initialize_message(i915, gsc_context); + if (ret) { + drm_err(&i915->drm, "Could not initialize gsc_context\n"); + kfree(gsc_context); + gsc_context = ERR_PTR(ret); + } + + return gsc_context; +} + +void intel_hdcp_gsc_context_free(struct intel_hdcp_gsc_context *gsc_context) +{ + if (!gsc_context) + return; + + i915_vma_unpin_and_release(&gsc_context->vma, I915_VMA_RELEASE_MAP); + kfree(gsc_context); +} + +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_context 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 intel_hdcp_gsc_context *gsc_context, + void *msg_in, size_t msg_in_len, + void *msg_out, size_t msg_out_len) +{ + struct drm_i915_private *i915 = gsc_context->i915; + 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); + 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); + header_in = gsc_context->hdcp_cmd_in; + header_out = gsc_context->hdcp_cmd_out; + addr_in = i915_ggtt_offset(gsc_context->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(gsc_context->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, gsc_context->hdcp_cmd_out + sizeof(*header_out), msg_out_len); + +err: + return ret; +} |