drm/amd/display: Create amdgpu_dm_hdcp

[Why]
We need to interact with the hdcp module from the DM, the module
has to be interacted with in terms of events

[How]
Create the files needed for linux hdcp. These files manage the events
needed for the dm to interact with the hdcp module.

We use the kernel work queue to process the events needed for
the module
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/Makefile

@@ -31,6 +31,10 @@ ifneq ($(CONFIG_DRM_AMD_DC),)
 AMDGPUDM += amdgpu_dm_services.o amdgpu_dm_helpers.o amdgpu_dm_pp_smu.o
 endif
 
+ifdef CONFIG_DRM_AMD_DC_HDCP
+AMDGPUDM += amdgpu_dm_hdcp.o
+endif
+
 ifneq ($(CONFIG_DEBUG_FS),)
 AMDGPUDM += amdgpu_dm_crc.o amdgpu_dm_debugfs.o
 endif

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c

+/*
+ * Copyright 2019 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#include "amdgpu_dm_hdcp.h"
+#include "amdgpu.h"
+#include "amdgpu_dm.h"
+
+static void process_output(struct hdcp_workqueue *hdcp_work)
+{
+	struct mod_hdcp_output output = hdcp_work->output;
+
+	if (output.callback_stop)
+		cancel_delayed_work(&hdcp_work->callback_dwork);
+
+	if (output.callback_needed)
+		schedule_delayed_work(&hdcp_work->callback_dwork,
+				      msecs_to_jiffies(output.callback_delay));
+
+	if (output.watchdog_timer_stop)
+		cancel_delayed_work(&hdcp_work->watchdog_timer_dwork);
+
+	if (output.watchdog_timer_needed)
+		schedule_delayed_work(&hdcp_work->watchdog_timer_dwork,
+				      msecs_to_jiffies(output.watchdog_timer_delay));
+
+}
+
+void hdcp_add_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index)
+{
+	struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
+	struct mod_hdcp_display *display = &hdcp_work[link_index].display;
+	struct mod_hdcp_link *link = &hdcp_work[link_index].link;
+
+	mutex_lock(&hdcp_w->mutex);
+
+	mod_hdcp_add_display(&hdcp_w->hdcp, link, display, &hdcp_w->output);
+
+	process_output(hdcp_w);
+
+	mutex_unlock(&hdcp_w->mutex);
+
+}
+
+void hdcp_remove_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index,  unsigned int display_index)
+{
+	struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
+
+	mutex_lock(&hdcp_w->mutex);
+
+	mod_hdcp_remove_display(&hdcp_w->hdcp, display_index, &hdcp_w->output);
+
+	process_output(hdcp_w);
+
+	mutex_unlock(&hdcp_w->mutex);
+
+}
+
+void hdcp_reset_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index)
+{
+	struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
+
+	mutex_lock(&hdcp_w->mutex);
+
+	mod_hdcp_reset_connection(&hdcp_w->hdcp,  &hdcp_w->output);
+
+	process_output(hdcp_w);
+
+	mutex_unlock(&hdcp_w->mutex);
+}
+
+void hdcp_handle_cpirq(struct hdcp_workqueue *hdcp_work, unsigned int link_index)
+{
+	struct hdcp_workqueue *hdcp_w = &hdcp_work[link_index];
+
+	schedule_work(&hdcp_w->cpirq_work);
+}
+
+
+
+
+static void event_callback(struct work_struct *work)
+{
+	struct hdcp_workqueue *hdcp_work;
+
+	hdcp_work = container_of(to_delayed_work(work), struct hdcp_workqueue,
+				      callback_dwork);
+
+	mutex_lock(&hdcp_work->mutex);
+
+	cancel_delayed_work(&hdcp_work->watchdog_timer_dwork);
+
+	mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CALLBACK,
+			       &hdcp_work->output);
+
+	process_output(hdcp_work);
+
+	mutex_unlock(&hdcp_work->mutex);
+
+
+}
+
+
+static void event_watchdog_timer(struct work_struct *work)
+{
+	struct hdcp_workqueue *hdcp_work;
+
+	hdcp_work = container_of(to_delayed_work(work),
+				      struct hdcp_workqueue,
+				      watchdog_timer_dwork);
+
+	mutex_lock(&hdcp_work->mutex);
+
+	mod_hdcp_process_event(&hdcp_work->hdcp,
+			       MOD_HDCP_EVENT_WATCHDOG_TIMEOUT,
+			       &hdcp_work->output);
+
+	process_output(hdcp_work);
+
+	mutex_unlock(&hdcp_work->mutex);
+
+}
+
+static void event_cpirq(struct work_struct *work)
+{
+	struct hdcp_workqueue *hdcp_work;
+
+	hdcp_work = container_of(work, struct hdcp_workqueue, cpirq_work);
+
+	mutex_lock(&hdcp_work->mutex);
+
+	mod_hdcp_process_event(&hdcp_work->hdcp, MOD_HDCP_EVENT_CPIRQ, &hdcp_work->output);
+
+	process_output(hdcp_work);
+
+	mutex_unlock(&hdcp_work->mutex);
+
+}
+
+
+void hdcp_destroy(struct hdcp_workqueue *hdcp_work)
+{
+	int i = 0;
+
+	for (i = 0; i < hdcp_work->max_link; i++) {
+		cancel_delayed_work_sync(&hdcp_work[i].callback_dwork);
+		cancel_delayed_work_sync(&hdcp_work[i].watchdog_timer_dwork);
+	}
+
+	kfree(hdcp_work);
+
+}
+
+static void update_config(void *handle, struct cp_psp_stream_config *config)
+{
+	struct hdcp_workqueue *hdcp_work = handle;
+	struct amdgpu_dm_connector *aconnector = config->dm_stream_ctx;
+	int link_index = aconnector->dc_link->link_index;
+	struct mod_hdcp_display *display = &hdcp_work[link_index].display;
+	struct mod_hdcp_link *link = &hdcp_work[link_index].link;
+
+	memset(display, 0, sizeof(*display));
+	memset(link, 0, sizeof(*link));
+
+	display->index = aconnector->base.index;
+	display->state = MOD_HDCP_DISPLAY_ACTIVE;
+
+	if (aconnector->dc_sink != NULL)
+		link->mode = mod_hdcp_signal_type_to_operation_mode(aconnector->dc_sink->sink_signal);
+
+	display->controller = CONTROLLER_ID_D0 + config->otg_inst;
+	display->dig_fe = config->stream_enc_inst;
+	link->dig_be = config->link_enc_inst;
+	link->ddc_line = aconnector->dc_link->ddc_hw_inst + 1;
+	link->dp.rev = aconnector->dc_link->dpcd_caps.dpcd_rev.raw;
+	link->adjust.hdcp2.disable = 1;
+
+}
+
+struct hdcp_workqueue *hdcp_create_workqueue(void *psp_context, struct cp_psp *cp_psp, struct dc *dc)
+{
+
+	int max_caps = dc->caps.max_links;
+	struct hdcp_workqueue *hdcp_work = kzalloc(max_caps*sizeof(*hdcp_work), GFP_KERNEL);
+	int i = 0;
+
+	if (hdcp_work == NULL)
+		goto fail_alloc_context;
+
+	hdcp_work->max_link = max_caps;
+
+	for (i = 0; i < max_caps; i++) {
+
+		mutex_init(&hdcp_work[i].mutex);
+
+		INIT_WORK(&hdcp_work[i].cpirq_work, event_cpirq);
+		INIT_DELAYED_WORK(&hdcp_work[i].callback_dwork, event_callback);
+		INIT_DELAYED_WORK(&hdcp_work[i].watchdog_timer_dwork, event_watchdog_timer);
+
+		hdcp_work[i].hdcp.config.psp.handle =  psp_context;
+		hdcp_work[i].hdcp.config.ddc.handle = dc_get_link_at_index(dc, i);
+
+	}
+
+	cp_psp->funcs.update_stream_config = update_config;
+	cp_psp->handle = hdcp_work;
+
+	return hdcp_work;
+
+fail_alloc_context:
+	kfree(hdcp_work);
+
+	return NULL;
+
+
+
+}
+
+
+

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.h

+/*
+ * Copyright 2019 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef AMDGPU_DM_AMDGPU_DM_HDCP_H_
+#define AMDGPU_DM_AMDGPU_DM_HDCP_H_
+
+#include "mod_hdcp.h"
+#include "hdcp.h"
+#include "dc.h"
+#include "dm_cp_psp.h"
+
+struct mod_hdcp;
+struct mod_hdcp_link;
+struct mod_hdcp_display;
+struct cp_psp;
+
+struct hdcp_workqueue {
+	struct work_struct cpirq_work;
+	struct delayed_work callback_dwork;
+	struct delayed_work watchdog_timer_dwork;
+	struct mutex mutex;
+
+	struct mod_hdcp hdcp;
+	struct mod_hdcp_output output;
+	struct mod_hdcp_display display;
+	struct mod_hdcp_link link;
+
+	uint8_t max_link;
+};
+
+void hdcp_add_display(struct hdcp_workqueue *hdcp_work, unsigned int link_index);
+void hdcp_remove_display(struct hdcp_workqueue *work, unsigned int link_index, unsigned int display_index);
+void hdcp_reset_display(struct hdcp_workqueue *work, unsigned int link_index);
+void hdcp_handle_cpirq(struct hdcp_workqueue *work, unsigned int link_index);
+void hdcp_destroy(struct hdcp_workqueue *work);
+
+struct hdcp_workqueue *hdcp_create_workqueue(void *psp_context, struct cp_psp *cp_psp, struct dc *dc);
+
+#endif /* AMDGPU_DM_AMDGPU_DM_HDCP_H_ */