Enable HDCP for Xe by defining functions which take care of interaction of HDCP as a client with the GSC CS interface. Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx> --- drivers/gpu/drm/xe/display/xe_hdcp_gsc.c | 188 ++++++++++++++++++++++- 1 file changed, 184 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c b/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c index 0f11a39333e2..eca941d7b281 100644 --- a/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c +++ b/drivers/gpu/drm/xe/display/xe_hdcp_gsc.c @@ -3,8 +3,24 @@ * Copyright 2023, Intel Corporation. */ +#include "abi/gsc_command_header_abi.h" #include "i915_drv.h" #include "intel_hdcp_gsc.h" +#include "xe_bo.h" +#include "xe_map.h" +#include "xe_gsc_submit.h" + +#define HECI_MEADDRESS_HDCP 18 + +struct intel_hdcp_gsc_message { + struct xe_bo *hdcp_bo; + u64 hdcp_cmd_in; + u64 hdcp_cmd_out; +}; + +#define HOST_SESSION_CLIENT_MASK GENMASK_ULL(63, 56) +#define HDCP_GSC_MESSAGE_SIZE sizeof(struct intel_hdcp_gsc_message) +#define HDCP_GSC_HEADER_SIZE sizeof(struct intel_gsc_mtl_header) bool intel_hdcp_gsc_cs_required(struct drm_i915_private *i915) { @@ -13,22 +29,186 @@ bool intel_hdcp_gsc_cs_required(struct drm_i915_private *i915) bool intel_hdcp_gsc_check_status(struct drm_i915_private *i915) { - 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 xe_bo *bo = NULL; + u64 cmd_in, cmd_out; + int err, ret = 0; + + /* allocate object of two page for HDCP command memory and store it */ + + xe_device_mem_access_get(i915); + bo = xe_bo_create_pin_map(i915, xe_device_get_root_tile(i915), NULL, PAGE_SIZE * 2, + ttm_bo_type_kernel, + XE_BO_CREATE_SYSTEM_BIT | + XE_BO_CREATE_GGTT_BIT); + + if (IS_ERR(bo)) { + drm_err(&i915->drm, "Failed to allocate bo for HDCP streaming command!\n"); + ret = err; + goto out; + } + + cmd_in = xe_bo_ggtt_addr(bo); + + if (iosys_map_is_null(&bo->vmap)) { + drm_err(&i915->drm, "Failed to map gsc message page!\n"); + ret = PTR_ERR(&bo->vmap); + goto out; + } + + cmd_out = cmd_in + PAGE_SIZE; + + xe_map_memset(i915, &bo->vmap, 0, 0, bo->size); + + hdcp_message->hdcp_bo = bo; + hdcp_message->hdcp_cmd_in = cmd_in; + hdcp_message->hdcp_cmd_out = cmd_out; +out: + xe_device_mem_access_put(i915); + return ret; +} + +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; } int intel_hdcp_gsc_init(struct drm_i915_private *i915) { - drm_info(&i915->drm, "HDCP support not yet implemented\n"); - return -ENODEV; + struct i915_hdcp_arbiter *data; + int ret; + + data = kzalloc(sizeof(*data), 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) { + struct intel_hdcp_gsc_message *hdcp_message = + i915->display.hdcp.hdcp_message; + + xe_bo_unpin_map_no_vm(hdcp_message->hdcp_bo); + kfree(hdcp_message); + } +static int xe_gsc_send_sync(struct drm_i915_private *i915, + struct intel_hdcp_gsc_message *hdcp_message, + u32 msg_size_in, u32 msg_size_out, + u32 addr_in_off, u32 addr_out_off, + size_t msg_out_len) +{ + struct xe_gt *gt = hdcp_message->hdcp_bo->tile->media_gt; + struct iosys_map *map = &hdcp_message->hdcp_bo->vmap; + struct xe_gsc *gsc = >->uc.gsc; + int ret; + + ret = xe_gsc_pkt_submit_kernel(gsc, hdcp_message->hdcp_cmd_in, msg_size_in, + hdcp_message->hdcp_cmd_out, msg_size_out); + if (ret) { + drm_err(&i915->drm, "failed to send gsc HDCP msg (%d)\n", ret); + return ret; + } + + ret = xe_gsc_check_and_update_pending(i915, map, 0, map, addr_out_off); + + if (ret) + return -EAGAIN; + + ret = xe_gsc_read_out_header(i915, map, addr_out_off, + sizeof(struct hdcp_cmd_header), NULL); + + return ret; +} 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) { - return -ENODEV; + const size_t max_msg_size = PAGE_SIZE - HDCP_GSC_HEADER_SIZE; + struct intel_hdcp_gsc_message *hdcp_message; + u64 host_session_id; + u32 msg_size_in, msg_size_out, addr_in_off = 0, addr_out_off; + int ret, tries = 0; + + if (msg_in_len > max_msg_size || msg_out_len > max_msg_size) { + ret = -ENOSPC; + goto out; + } + + msg_size_in = msg_in_len + HDCP_GSC_HEADER_SIZE; + msg_size_out = msg_out_len + HDCP_GSC_HEADER_SIZE; + hdcp_message = i915->display.hdcp.hdcp_message; + addr_out_off = PAGE_SIZE; + + get_random_bytes(&host_session_id, sizeof(u64)); + host_session_id = host_session_id & ~HOST_SESSION_CLIENT_MASK; + xe_device_mem_access_get(i915); + addr_in_off = xe_gsc_emit_header(i915, &hdcp_message->hdcp_bo->vmap, + addr_in_off, + HECI_MEADDRESS_HDCP, host_session_id, + msg_in_len); + + xe_map_memcpy_to(i915, &hdcp_message->hdcp_bo->vmap, addr_in_off, 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 = xe_gsc_send_sync(i915, hdcp_message, msg_size_in, msg_size_out, + addr_in_off, addr_out_off, msg_out_len); + + /* Only try again if gsc says so */ + if (ret != -EAGAIN) + break; + + msleep(50); + + } while (++tries < 20); + + if (ret) + goto out; + + xe_map_memcpy_from(i915, msg_out, &hdcp_message->hdcp_bo->vmap, + addr_out_off + HDCP_GSC_HEADER_SIZE, + msg_out_len); + +out: + xe_device_mem_access_put(i915); + return ret; } -- 2.25.1