This patch implements the necessary functions to add writeback support
for vkms. This feature is useful for testing compositors if you don't
have hardware with writeback support.
Change in V2:
- Rework signal completion (Brian)
- Integrates writeback with active_planes (Daniel)
- Compose cursor (Daniel)
Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@xxxxxxxxx>
---
drivers/gpu/drm/vkms/Makefile | 3 +-
drivers/gpu/drm/vkms/vkms_drv.c | 7 ++
drivers/gpu/drm/vkms/vkms_drv.h | 6 +
drivers/gpu/drm/vkms/vkms_output.c | 6 +
drivers/gpu/drm/vkms/vkms_writeback.c | 166 ++++++++++++++++++++++++++
5 files changed, 187 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/vkms/vkms_writeback.c
diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile
index b4c040854bd6..091e6fa643d1 100644
--- a/drivers/gpu/drm/vkms/Makefile
+++ b/drivers/gpu/drm/vkms/Makefile
@@ -6,6 +6,7 @@ vkms-y := \
vkms_crtc.o \
vkms_gem.o \
vkms_composer.o \
- vkms_crc.o
+ vkms_crc.o \
+ vkms_writeback.o
obj-$(CONFIG_DRM_VKMS) += vkms.o
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 966b3d653189..d870779abf9d 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -30,6 +30,10 @@ bool enable_cursor;
module_param_named(enable_cursor, enable_cursor, bool, 0444);
MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
+bool enable_writeback;
+module_param_named(enable_writeback, enable_writeback, bool, 0444);
+MODULE_PARM_DESC(enable_writeback, "Enable/Disable writeback connector");
+
static const struct file_operations vkms_driver_fops = {
.owner = THIS_MODULE,
.open = drm_open,
@@ -158,6 +162,9 @@ static int __init vkms_init(void)
goto out_fini;
}
+ if (enable_writeback)
+ DRM_INFO("Writeback connector enabled");
+
ret = vkms_modeset_init(vkms_device);
if (ret)
goto out_fini;
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index ad63dbe5e994..bf3fa737b3d7 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -7,6 +7,7 @@
#include <drm/drm.h>
#include <drm/drm_gem.h>
#include <drm/drm_encoder.h>
+#include <drm/drm_writeback.h>
#include <linux/hrtimer.h>
#define XRES_MIN 20
@@ -19,6 +20,7 @@
#define YRES_MAX 8192
extern bool enable_cursor;
+extern bool enable_writeback;
struct vkms_data {
struct drm_framebuffer fb;
@@ -63,6 +65,7 @@ struct vkms_output {
struct drm_crtc crtc;
struct drm_encoder encoder;
struct drm_connector connector;
+ struct drm_writeback_connector wb_connector;
struct hrtimer vblank_hrtimer;
ktime_t period_ns;
struct drm_pending_vblank_event *event;
@@ -143,4 +146,7 @@ int vkms_verify_crc_source(struct drm_crtc *crtc, const char *source_name,
size_t *values_cnt);
void vkms_crc_work_handle(struct work_struct *work);
+/* Writeback */
+int enable_writeback_connector(struct vkms_device *vkmsdev);
+
#endif /* _VKMS_DRV_H_ */
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index fb1941a6522c..3b093ae8f373 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -84,6 +84,12 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
goto err_attach;
}
+ if (enable_writeback) {
+ ret = enable_writeback_connector(vkmsdev);
+ if (ret)
+ DRM_ERROR("Failed to init writeback connector\n");
+ }
+
drm_mode_config_reset(dev);
return 0;
diff --git a/drivers/gpu/drm/vkms/vkms_writeback.c b/drivers/gpu/drm/vkms/vkms_writeback.c
new file mode 100644
index 000000000000..56632eb393cb
--- /dev/null
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "vkms_drv.h"
+#include "vkms_composer.h"
+#include <drm/drm_writeback.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+
+static const u32 vkms_wb_formats[] = {
+ DRM_FORMAT_XRGB8888,
+};
+
+static const struct drm_connector_funcs vkms_wb_connector_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_framebuffer *fb;
+ const struct drm_display_mode *mode = &crtc_state->mode;
+
+ if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
+ return 0;
+
+ fb = conn_state->writeback_job->fb;
+ if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
+ DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
+ fb->width, fb->height);
+ return -EINVAL;
+ }
+
+ if (fb->format->format != DRM_FORMAT_XRGB8888) {
+ struct drm_format_name_buf format_name;
+
+ DRM_DEBUG_KMS("Invalid pixel format %s\n",
+ drm_get_format_name(fb->format->format,
+ &format_name));
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
+ .atomic_check = vkms_wb_encoder_atomic_check,
+};
+
+static int vkms_wb_connector_get_modes(struct drm_connector *connector)
+{
+ struct drm_device *dev = connector->dev;
+
+ return drm_add_modes_noedid(connector, dev->mode_config.max_width,
+ dev->mode_config.max_height);
+}
+
+static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
+ struct drm_writeback_job *job)
+{
+ struct vkms_gem_object *vkms_obj;
+ struct drm_gem_object *gem_obj;
+ int ret;
+
+ if (!job->fb)
+ return 0;
+
+ gem_obj = drm_gem_fb_get_obj(job->fb, 0);
+ ret = vkms_gem_vmap(gem_obj);
+ if (ret) {
+ DRM_ERROR("vmap failed: %d\n", ret);
+ return ret;
+ }
+
+ vkms_obj = drm_gem_to_vkms_gem(gem_obj);
+ job->priv = vkms_obj->vaddr;
+
+ return 0;
+}
+
+static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
+ struct drm_writeback_job *job)
+{
+ struct drm_gem_object *gem_obj;
+
+ if (!job->fb)
+ return;
+
+ gem_obj = drm_gem_fb_get_obj(job->fb, 0);
+ vkms_gem_vunmap(gem_obj);
+}
+
+static void vkms_wb_atomic_commit(struct drm_connector *conn,
+ struct drm_connector_state *state)
+{
+ struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
+ struct vkms_output *output = &vkmsdev->output;
+ struct vkms_crtc_state *crtc_state = output->crc_state;
+ struct drm_writeback_connector *wb_conn = &output->wb_connector;
+ struct drm_connector_state *conn_state = wb_conn->base.state;
+ void *priv_data = conn_state->writeback_job->priv;
+ struct vkms_data *primary_data = NULL;
+ struct vkms_data *cursor_data = NULL;
+ struct drm_framebuffer *fb = NULL;
+ struct vkms_gem_object *vkms_obj;
+ struct drm_gem_object *gem_obj;
+
+ if (!conn_state)
+ return;
+
+ if (!conn_state->writeback_job || !conn_state->writeback_job->fb) {
+ DRM_DEBUG_DRIVER("Disable writeback\n");
+ return;
+ }
+
+ if (crtc_state->num_active_planes >= 1)
+ primary_data = crtc_state->active_planes[0]->data;
+
+ if (crtc_state->num_active_planes == 2)
+ cursor_data = crtc_state->active_planes[1]->data;
+
+ if (!primary_data)
+ return;
+
+ fb = &primary_data->fb;
+ gem_obj = drm_gem_fb_get_obj(fb, 0);
+ vkms_obj = drm_gem_to_vkms_gem(gem_obj);
+
+ if (!vkms_obj->vaddr || !priv_data)
+ return;
+
+ drm_writeback_queue_job(wb_conn, state);
+
+ memcpy(priv_data, vkms_obj->vaddr, vkms_obj->gem.size);
+ if (cursor_data)
+ compose_cursor(cursor_data, primary_data, priv_data);
+
+ drm_writeback_signal_completion(wb_conn, 0);
+}
+
+static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
+ .get_modes = vkms_wb_connector_get_modes,
+ .prepare_writeback_job = vkms_wb_prepare_job,
+ .cleanup_writeback_job = vkms_wb_cleanup_job,
+ .atomic_commit = vkms_wb_atomic_commit,
+};
+
+int enable_writeback_connector(struct vkms_device *vkmsdev)
+{
+ struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
+
+ vkmsdev->output.wb_connector.encoder.possible_crtcs = 1;
+ drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
+
+ return drm_writeback_connector_init(&vkmsdev->drm, wb,
+ &vkms_wb_connector_funcs,
+ &vkms_wb_encoder_helper_funcs,
+ vkms_wb_formats,
+ ARRAY_SIZE(vkms_wb_formats));
+}
+
--
2.21.0
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