Hi Marius,
On 5/8/23 04:53, Marius Vlad wrote:
This adds support for creating multiple virtual pipes, in case one would
need to display multiple independent things on different outputs.
We use a module parameter to specify how many to create, defaulting to
just one with the possibility of specifying a maximum of 4 possible pipes.
This is of particular importance when testing out the DRM back-end in
compositors, but also to be able to independently set different DPMS states.
Signed-off-by: Marius Vlad <marius.vlad@xxxxxxxxxxxxx>
---
drivers/gpu/drm/vkms/vkms_crtc.c | 3 +--
drivers/gpu/drm/vkms/vkms_drv.c | 37 ++++++++++++++++++++++-----
drivers/gpu/drm/vkms/vkms_drv.h | 12 ++++++---
drivers/gpu/drm/vkms/vkms_output.c | 5 ++--
drivers/gpu/drm/vkms/vkms_writeback.c | 24 ++++++++---------
5 files changed, 55 insertions(+), 26 deletions(-)
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 515f6772b866..051e7b647db9 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -89,8 +89,7 @@ static bool vkms_get_vblank_timestamp(struct drm_crtc *crtc,
{
struct drm_device *dev = crtc->dev;
unsigned int pipe = crtc->index;
- struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
- struct vkms_output *output = &vkmsdev->output;
+ struct vkms_output *output = drm_crtc_to_vkms_output(crtc);
struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
if (!READ_ONCE(vblank->enabled)) {
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index bd53194f1525..b93157fa5336 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -51,14 +51,19 @@ static bool enable_overlay;
module_param_named(enable_overlay, enable_overlay, bool, 0444);
MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
+static unsigned int max_pipes = 1;
+module_param_named(max_pipes, max_pipes, int, 0444);
+MODULE_PARM_DESC(max_pipes, "Specify how many pipes to create");
+
DEFINE_DRM_GEM_FOPS(vkms_driver_fops);
static void vkms_release(struct drm_device *dev)
{
- struct vkms_device *vkms = drm_device_to_vkms_device(dev);
+ int i;
+ struct vkms_device *vkmsdev = drm_device_to_vkms_device(dev);
- if (vkms->output.composer_workq)
- destroy_workqueue(vkms->output.composer_workq);
+ for (i = 0; i < vkmsdev->config->max_pipes; i++)
+ destroy_workqueue(vkmsdev->output[i].composer_workq);
}
static void vkms_atomic_commit_tail(struct drm_atomic_state *old_state)
@@ -100,6 +105,7 @@ static int vkms_config_show(struct seq_file *m, void *data)
seq_printf(m, "cursor=%d\n", vkmsdev->config->cursor);
seq_printf(m, "overlay=%d\n", vkmsdev->config->overlay);
seq_printf(m, "overlay_planes=%d\n", vkmsdev->config->overlay_planes);
+ seq_printf(m, "pipes=%d\n", vkmsdev->config->max_pipes);
return 0;
}
@@ -134,7 +140,7 @@ static const struct drm_mode_config_helper_funcs vkms_mode_config_helpers = {
static int vkms_modeset_init(struct vkms_device *vkmsdev)
{
struct drm_device *dev = &vkmsdev->drm;
- int ret;
+ int ret, i;
ret = drmm_mode_config_init(dev);
if (ret)
@@ -153,7 +159,14 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
dev->mode_config.preferred_depth = 0;
dev->mode_config.helper_private = &vkms_mode_config_helpers;
- return vkms_output_init(vkmsdev, 0);
+ for (i = 0; i < vkmsdev->config->max_pipes; i++) {
+ ret = vkms_output_init(vkmsdev, i);
+ if (ret)
+ return ret;
+ }
+
+ drm_mode_config_reset(dev);
+ return ret;
}
static int vkms_create(struct vkms_config *config)
@@ -189,7 +202,7 @@ static int vkms_create(struct vkms_config *config)
goto out_devres;
}
- ret = drm_vblank_init(&vkms_device->drm, 1);
+ ret = drm_vblank_init(&vkms_device->drm, config->max_pipes);
if (ret) {
DRM_ERROR("Failed to vblank\n");
goto out_devres;
@@ -232,7 +245,19 @@ static int __init vkms_init(void)
config->writeback = enable_writeback;
config->overlay = enable_overlay;
config->overlay_planes = NUM_OVERLAY_PLANES;
+ config->max_pipes = max_pipes;
+
+ if (config->max_pipes > NUM_MAX_PIPES)
+ config->max_pipes = NUM_MAX_PIPES;
+ if (config->max_pipes < NUM_MIN_PIPES)
+ config->max_pipes = NUM_MIN_PIPES;
+
+ /* with NUM_OVERLAY_PLANES overlays and 4 pipes we'll exceed the amount
+ * of planes we can have; see drm_mode_config::num_total_plane */
+ if (config->overlay && config->max_pipes == NUM_MAX_PIPES)
+ config->overlay_planes -= 2;
I'm not sure if you really need to set the overlay planes as a kernel parameter.
You could just reduce NUM_OVERLAY_PLANES to 6 or even 4. This way you could
remove this if statement and make the logic more simple.
Best Regards,
- Maíra Canal
+ DRM_INFO("Initialized with %u pipes\n", config->max_pipes);
ret = vkms_create(config);
if (ret)
kfree(config);
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index ae2b38360236..29617cd491e3 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -21,7 +21,9 @@
#define XRES_MAX 8192
#define YRES_MAX 8192
-#define NUM_OVERLAY_PLANES 8
+#define NUM_OVERLAY_PLANES 8
+#define NUM_MAX_PIPES 4
+#define NUM_MIN_PIPES 1
struct vkms_frame_info {
struct drm_framebuffer *fb;
@@ -113,6 +115,7 @@ struct vkms_config {
bool cursor;
bool overlay;
unsigned int overlay_planes;
+ unsigned int max_pipes;
/* only set when instantiated */
struct vkms_device *dev;
};
@@ -120,13 +123,16 @@ struct vkms_config {
struct vkms_device {
struct drm_device drm;
struct platform_device *platform;
- struct vkms_output output;
+ struct vkms_output output[NUM_MAX_PIPES];
const struct vkms_config *config;
};
#define drm_crtc_to_vkms_output(target) \
container_of(target, struct vkms_output, crtc)
+#define wb_connector_to_vkms_output(target) \
+ container_of(target, struct vkms_output, wb_connector)
+
#define drm_device_to_vkms_device(target) \
container_of(target, struct vkms_device, drm)
@@ -158,6 +164,6 @@ void vkms_set_composer(struct vkms_output *out, bool enabled);
void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state *plane, int y);
/* Writeback */
-int vkms_enable_writeback_connector(struct vkms_device *vkmsdev);
+int vkms_enable_writeback_connector(struct vkms_device *vkmsdev, int index);
#endif /* _VKMS_DRV_H_ */
diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
index f4e67a0ad712..ca4dc16b8d01 100644
--- a/drivers/gpu/drm/vkms/vkms_output.c
+++ b/drivers/gpu/drm/vkms/vkms_output.c
@@ -48,7 +48,7 @@ static int vkms_add_overlay_plane(struct vkms_device *vkmsdev, int index,
int vkms_output_init(struct vkms_device *vkmsdev, int index)
{
- struct vkms_output *output = &vkmsdev->output;
+ struct vkms_output *output = &vkmsdev->output[index];
struct drm_device *dev = &vkmsdev->drm;
struct drm_connector *connector = &output->connector;
struct drm_encoder *encoder = &output->encoder;
@@ -104,12 +104,11 @@ int vkms_output_init(struct vkms_device *vkmsdev, int index)
}
if (vkmsdev->config->writeback) {
- writeback = vkms_enable_writeback_connector(vkmsdev);
+ writeback = vkms_enable_writeback_connector(vkmsdev, index);
if (writeback)
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
index 84a51cd281b9..5f291689f870 100644
--- a/drivers/gpu/drm/vkms/vkms_writeback.c
+++ b/drivers/gpu/drm/vkms/vkms_writeback.c
@@ -101,7 +101,7 @@ static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
struct drm_writeback_job *job)
{
struct vkms_writeback_job *vkmsjob = job->priv;
- struct vkms_device *vkmsdev;
+ struct vkms_output *output = wb_connector_to_vkms_output(connector);
if (!job->fb)
return;
@@ -110,19 +110,18 @@ static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
drm_framebuffer_put(vkmsjob->wb_frame_info.fb);
- vkmsdev = drm_device_to_vkms_device(job->fb->dev);
- vkms_set_composer(&vkmsdev->output, false);
+ vkms_set_composer(output, false);
kfree(vkmsjob);
}
static void vkms_wb_atomic_commit(struct drm_connector *conn,
struct drm_atomic_state *state)
{
- struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
- conn);
- struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
- struct vkms_output *output = &vkmsdev->output;
- struct drm_writeback_connector *wb_conn = &output->wb_connector;
+ struct drm_connector_state *connector_state =
+ drm_atomic_get_new_connector_state(state, conn);
+ struct drm_writeback_job *wb_job = connector_state->writeback_job;
+ struct drm_writeback_connector *wb_conn = wb_job->connector;
+ struct vkms_output *output = wb_connector_to_vkms_output(wb_conn);
struct drm_connector_state *conn_state = wb_conn->base.state;
struct vkms_crtc_state *crtc_state = output->composer_state;
struct drm_framebuffer *fb = connector_state->writeback_job->fb;
@@ -135,7 +134,7 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
if (!conn_state)
return;
- vkms_set_composer(&vkmsdev->output, true);
+ vkms_set_composer(output, true);
active_wb = conn_state->writeback_job->priv;
wb_frame_info = &active_wb->wb_frame_info;
@@ -147,6 +146,7 @@ static void vkms_wb_atomic_commit(struct drm_connector *conn,
wb_frame_info->cpp = fb->format->cpp[0];
crtc_state->wb_pending = true;
spin_unlock_irq(&output->composer_lock);
+
drm_writeback_queue_job(wb_conn, connector_state);
active_wb->wb_write = get_line_to_frame_function(wb_format);
drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height);
@@ -160,9 +160,9 @@ static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
.atomic_commit = vkms_wb_atomic_commit,
};
-int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
+int vkms_enable_writeback_connector(struct vkms_device *vkmsdev, int index)
{
- struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
+ struct drm_writeback_connector *wb = &vkmsdev->output[index].wb_connector;
drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
@@ -171,5 +171,5 @@ int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
&vkms_wb_encoder_helper_funcs,
vkms_wb_formats,
ARRAY_SIZE(vkms_wb_formats),
- 1);
+ 1 << index);
}
