Re: [Intel-gfx] [PATCH v9 20/24] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
On Mon, Nov 19, 2018 at 10:27:44PM +0200, Ville Syrjälä wrote:
> On Thu, Nov 15, 2018 at 05:39:42PM -0800, Manasi Navare wrote:
> > On Tue, Nov 13, 2018 at 05:52:28PM -0800, Manasi Navare wrote:
> > > DSC can be supported per DP connector. This patch adds a per connector
> > > debugfs node to expose DSC support capability by the kernel.
> > > The same node can be used from userspace to force DSC enable.
> > >
> > > force_dsc_en written through this debugfs node is used to force
> > > DSC even for lower resolutions.
> > >
> > > v4:
> > > * Add missed connector_status check (Manasi)
> > > * Create i915_dsc_support node only for Gen >=10 (manasi)
> > > * Access intel_dp->dsc_dpcd only if its not NULL (Manasi)
> > > v3:
> > > * Combine Force_dsc_en with this patch (Ville)
> > > v2:
> > > * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> > > * Rebase on drm-tip (Manasi)
> > >
> > > Cc: Rodrigo Vivi
> > > Cc: Ville Syrjala
> > > Cc: Anusha Srivatsa
> > > Cc: Lyude Paul
> > > Signed-off-by: Manasi Navare
> > > Reviewed-by: Lyude Paul
> > > ---
> > > drivers/gpu/drm/i915/i915_debugfs.c | 77 +
> > > drivers/gpu/drm/i915/intel_dp.c | 3 +-
> > > drivers/gpu/drm/i915/intel_drv.h| 3 ++
> > > 3 files changed, 82 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> > > b/drivers/gpu/drm/i915/i915_debugfs.c
> > > index 670db5073d70..3c112bb225d6 100644
> > > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > > @@ -5074,6 +5074,76 @@ static int i915_hdcp_sink_capability_show(struct
> > > seq_file *m, void *data)
> > > }
> > > DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
> > >
> > > +static int i915_dsc_support_show(struct seq_file *m, void *data)
> > > +{
> > > + struct drm_connector *connector = m->private;
> > > + struct intel_encoder *encoder = intel_attached_encoder(connector);
> > > + struct intel_dp *intel_dp =
> > > + enc_to_intel_dp(&encoder->base);
> > > + struct intel_crtc *crtc;
> > > + struct intel_crtc_state *crtc_state;
> > > +
> > > + if (connector->status != connector_status_connected)
> > > + return -ENODEV;
> > > +
> > > + crtc = to_intel_crtc(encoder->base.crtc);
> > > + crtc_state = to_intel_crtc_state(crtc->base.state);
>
> This stuff is broken. If you want to root around in the atomic states
> you need to grab some locks first.
I thought using the drm_modeset_lock before grabbing the crtc_state value should
be enough.
Are you referring to using the locks like:
drm_modeset_lock_single_interruptible()?
>
> > > + drm_modeset_lock(&crtc->base.mutex, NULL);
> > > + seq_printf(m, "Enabled: %s\n",
> > > +yesno(crtc_state->dsc_params.compression_enable));
> > > + if (intel_dp->dsc_dpcd)
> > > + seq_printf(m, "Supported: %s\n",
> > > +yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
> >
> > I think this supported should also use the intel_dp_supports_dsc() helper so
> > it checks for sink support and platform support as well.
> >
> > Ville, what do you think?
>
> Possibly. We may want to report per-crtc whether DSC is possible or not
> (due to transcoder A not being capable of DSC). And to do that we
> actually need to change intel_dp_source_supports_dsc() & co. to not take
> the crtc state, and rather we just need to pass in the transcoder. That
> would mean we have to determine the correct transcoder here. Perhaps
> a better alternative would be to pass in pipe/crtc + port and let the
> function derive the transcoder itself. That would keep the
> pipe+port->transcoder logic in one place. Actually we have that logic
> in two places at least already (intel_ddi_compute_config() and
> intel_ddi_connector_get_hw_state()). We could extract that bit into
> a small helper that gets called by all three places.
So there would be Sink_Supported and Enabled separately and then for
for_each_crtc loop and report out Source_supported for every crtc
by passing port and pipe/crtc and determining transcoder from that find
the intel_dp_source_supports_dsc for that transcoder ?
Is this the correct way?
Also should this be kept separately in a follow on series and get the simpler
version of intel_dp_supports_dsc() merged first?
Manasi
>
> >
> > Manasi
> >
> > > + drm_modeset_unlock(&crtc->base.mutex);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static ssize_t i915_dsc_support_write(struct file *file,
> > > + const char __user *ubuf,
> > > + size_t len, loff_t *offp)
> > > +{
> > > + bool dsc_enable = false;
> > > + int ret;
> > > + struct drm_connector *connector =
> > > + ((struct seq_file *)file->private_data)->private;
> > > + struct intel_encoder *encoder = intel_attached_encoder(connector);
> > > + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > > +
> > > + if (len == 0)
> > > + return 0;
Re: [Intel-gfx] [PATCH v9 20/24] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
On Thu, Nov 15, 2018 at 05:39:42PM -0800, Manasi Navare wrote:
> On Tue, Nov 13, 2018 at 05:52:28PM -0800, Manasi Navare wrote:
> > DSC can be supported per DP connector. This patch adds a per connector
> > debugfs node to expose DSC support capability by the kernel.
> > The same node can be used from userspace to force DSC enable.
> >
> > force_dsc_en written through this debugfs node is used to force
> > DSC even for lower resolutions.
> >
> > v4:
> > * Add missed connector_status check (Manasi)
> > * Create i915_dsc_support node only for Gen >=10 (manasi)
> > * Access intel_dp->dsc_dpcd only if its not NULL (Manasi)
> > v3:
> > * Combine Force_dsc_en with this patch (Ville)
> > v2:
> > * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> > * Rebase on drm-tip (Manasi)
> >
> > Cc: Rodrigo Vivi
> > Cc: Ville Syrjala
> > Cc: Anusha Srivatsa
> > Cc: Lyude Paul
> > Signed-off-by: Manasi Navare
> > Reviewed-by: Lyude Paul
> > ---
> > drivers/gpu/drm/i915/i915_debugfs.c | 77 +
> > drivers/gpu/drm/i915/intel_dp.c | 3 +-
> > drivers/gpu/drm/i915/intel_drv.h| 3 ++
> > 3 files changed, 82 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> > b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 670db5073d70..3c112bb225d6 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -5074,6 +5074,76 @@ static int i915_hdcp_sink_capability_show(struct
> > seq_file *m, void *data)
> > }
> > DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
> >
> > +static int i915_dsc_support_show(struct seq_file *m, void *data)
> > +{
> > + struct drm_connector *connector = m->private;
> > + struct intel_encoder *encoder = intel_attached_encoder(connector);
> > + struct intel_dp *intel_dp =
> > + enc_to_intel_dp(&encoder->base);
> > + struct intel_crtc *crtc;
> > + struct intel_crtc_state *crtc_state;
> > +
> > + if (connector->status != connector_status_connected)
> > + return -ENODEV;
> > +
> > + crtc = to_intel_crtc(encoder->base.crtc);
> > + crtc_state = to_intel_crtc_state(crtc->base.state);
This stuff is broken. If you want to root around in the atomic states
you need to grab some locks first.
> > + drm_modeset_lock(&crtc->base.mutex, NULL);
> > + seq_printf(m, "Enabled: %s\n",
> > + yesno(crtc_state->dsc_params.compression_enable));
> > + if (intel_dp->dsc_dpcd)
> > + seq_printf(m, "Supported: %s\n",
> > + yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
>
> I think this supported should also use the intel_dp_supports_dsc() helper so
> it checks for sink support and platform support as well.
>
> Ville, what do you think?
Possibly. We may want to report per-crtc whether DSC is possible or not
(due to transcoder A not being capable of DSC). And to do that we
actually need to change intel_dp_source_supports_dsc() & co. to not take
the crtc state, and rather we just need to pass in the transcoder. That
would mean we have to determine the correct transcoder here. Perhaps
a better alternative would be to pass in pipe/crtc + port and let the
function derive the transcoder itself. That would keep the
pipe+port->transcoder logic in one place. Actually we have that logic
in two places at least already (intel_ddi_compute_config() and
intel_ddi_connector_get_hw_state()). We could extract that bit into
a small helper that gets called by all three places.
>
> Manasi
>
> > + drm_modeset_unlock(&crtc->base.mutex);
> > +
> > + return 0;
> > +}
> > +
> > +static ssize_t i915_dsc_support_write(struct file *file,
> > + const char __user *ubuf,
> > + size_t len, loff_t *offp)
> > +{
> > + bool dsc_enable = false;
> > + int ret;
> > + struct drm_connector *connector =
> > + ((struct seq_file *)file->private_data)->private;
> > + struct intel_encoder *encoder = intel_attached_encoder(connector);
> > + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> > +
> > + if (len == 0)
> > + return 0;
> > +
> > + DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
> > +(unsigned int)len);
> > +
> > + ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
> > + if (ret < 0)
> > + return ret;
> > +
> > + DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
> > +(dsc_enable) ? "true" : "false");
> > + intel_dp->force_dsc_en = dsc_enable;
> > +
> > + *offp += len;
> > + return len;
> > +}
> > +
> > +static int i915_dsc_support_open(struct inode *inode,
> > +struct file *file)
> > +{
> > + return single_open(file, i915_dsc_support_show,
> > + inode->i_private);
> > +}
> > +
> > +static const struct file_operations i915_dsc_support_fops = {
> > + .owner = THIS_MODULE,
> > + .open = i915_dsc_support
Re: [Intel-gfx] [PATCH v9 20/24] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
On Tue, Nov 13, 2018 at 05:52:28PM -0800, Manasi Navare wrote:
> DSC can be supported per DP connector. This patch adds a per connector
> debugfs node to expose DSC support capability by the kernel.
> The same node can be used from userspace to force DSC enable.
>
> force_dsc_en written through this debugfs node is used to force
> DSC even for lower resolutions.
>
> v4:
> * Add missed connector_status check (Manasi)
> * Create i915_dsc_support node only for Gen >=10 (manasi)
> * Access intel_dp->dsc_dpcd only if its not NULL (Manasi)
> v3:
> * Combine Force_dsc_en with this patch (Ville)
> v2:
> * Use kstrtobool_from_user to avoid explicit error checking (Lyude)
> * Rebase on drm-tip (Manasi)
>
> Cc: Rodrigo Vivi
> Cc: Ville Syrjala
> Cc: Anusha Srivatsa
> Cc: Lyude Paul
> Signed-off-by: Manasi Navare
> Reviewed-by: Lyude Paul
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 77 +
> drivers/gpu/drm/i915/intel_dp.c | 3 +-
> drivers/gpu/drm/i915/intel_drv.h| 3 ++
> 3 files changed, 82 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 670db5073d70..3c112bb225d6 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -5074,6 +5074,76 @@ static int i915_hdcp_sink_capability_show(struct
> seq_file *m, void *data)
> }
> DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
>
> +static int i915_dsc_support_show(struct seq_file *m, void *data)
> +{
> + struct drm_connector *connector = m->private;
> + struct intel_encoder *encoder = intel_attached_encoder(connector);
> + struct intel_dp *intel_dp =
> + enc_to_intel_dp(&encoder->base);
> + struct intel_crtc *crtc;
> + struct intel_crtc_state *crtc_state;
> +
> + if (connector->status != connector_status_connected)
> + return -ENODEV;
> +
> + crtc = to_intel_crtc(encoder->base.crtc);
> + crtc_state = to_intel_crtc_state(crtc->base.state);
> + drm_modeset_lock(&crtc->base.mutex, NULL);
> + seq_printf(m, "Enabled: %s\n",
> +yesno(crtc_state->dsc_params.compression_enable));
> + if (intel_dp->dsc_dpcd)
> + seq_printf(m, "Supported: %s\n",
> +yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
I think this supported should also use the intel_dp_supports_dsc() helper so
it checks for sink support and platform support as well.
Ville, what do you think?
Manasi
> + drm_modeset_unlock(&crtc->base.mutex);
> +
> + return 0;
> +}
> +
> +static ssize_t i915_dsc_support_write(struct file *file,
> + const char __user *ubuf,
> + size_t len, loff_t *offp)
> +{
> + bool dsc_enable = false;
> + int ret;
> + struct drm_connector *connector =
> + ((struct seq_file *)file->private_data)->private;
> + struct intel_encoder *encoder = intel_attached_encoder(connector);
> + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> +
> + if (len == 0)
> + return 0;
> +
> + DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
> + (unsigned int)len);
> +
> + ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
> + if (ret < 0)
> + return ret;
> +
> + DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
> + (dsc_enable) ? "true" : "false");
> + intel_dp->force_dsc_en = dsc_enable;
> +
> + *offp += len;
> + return len;
> +}
> +
> +static int i915_dsc_support_open(struct inode *inode,
> + struct file *file)
> +{
> + return single_open(file, i915_dsc_support_show,
> +inode->i_private);
> +}
> +
> +static const struct file_operations i915_dsc_support_fops = {
> + .owner = THIS_MODULE,
> + .open = i915_dsc_support_open,
> + .read = seq_read,
> + .llseek = seq_lseek,
> + .release = single_release,
> + .write = i915_dsc_support_write
> +};
> +
> /**
> * i915_debugfs_connector_add - add i915 specific connector debugfs files
> * @connector: pointer to a registered drm_connector
> @@ -5086,6 +5156,7 @@ DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
> int i915_debugfs_connector_add(struct drm_connector *connector)
> {
> struct dentry *root = connector->debugfs_entry;
> + struct drm_i915_private *dev_priv = to_i915(connector->dev);
>
> /* The connector must have been registered beforehands. */
> if (!root)
> @@ -5110,5 +5181,11 @@ int i915_debugfs_connector_add(struct drm_connector
> *connector)
> connector, &i915_hdcp_sink_capability_fops);
> }
>
> + if (INTEL_GEN(dev_priv) >= 10 &&
> + (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> + connector->connector_type == DRM_MODE_CONNECTOR_eDP))
> + debugfs_cr
[Intel-gfx] [PATCH v9 20/24] drm/i915/dsc: Add Per connector debugfs node for DSC support/enable
DSC can be supported per DP connector. This patch adds a per connector
debugfs node to expose DSC support capability by the kernel.
The same node can be used from userspace to force DSC enable.
force_dsc_en written through this debugfs node is used to force
DSC even for lower resolutions.
v4:
* Add missed connector_status check (Manasi)
* Create i915_dsc_support node only for Gen >=10 (manasi)
* Access intel_dp->dsc_dpcd only if its not NULL (Manasi)
v3:
* Combine Force_dsc_en with this patch (Ville)
v2:
* Use kstrtobool_from_user to avoid explicit error checking (Lyude)
* Rebase on drm-tip (Manasi)
Cc: Rodrigo Vivi
Cc: Ville Syrjala
Cc: Anusha Srivatsa
Cc: Lyude Paul
Signed-off-by: Manasi Navare
Reviewed-by: Lyude Paul
---
drivers/gpu/drm/i915/i915_debugfs.c | 77 +
drivers/gpu/drm/i915/intel_dp.c | 3 +-
drivers/gpu/drm/i915/intel_drv.h| 3 ++
3 files changed, 82 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 670db5073d70..3c112bb225d6 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5074,6 +5074,76 @@ static int i915_hdcp_sink_capability_show(struct
seq_file *m, void *data)
}
DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
+static int i915_dsc_support_show(struct seq_file *m, void *data)
+{
+ struct drm_connector *connector = m->private;
+ struct intel_encoder *encoder = intel_attached_encoder(connector);
+ struct intel_dp *intel_dp =
+ enc_to_intel_dp(&encoder->base);
+ struct intel_crtc *crtc;
+ struct intel_crtc_state *crtc_state;
+
+ if (connector->status != connector_status_connected)
+ return -ENODEV;
+
+ crtc = to_intel_crtc(encoder->base.crtc);
+ crtc_state = to_intel_crtc_state(crtc->base.state);
+ drm_modeset_lock(&crtc->base.mutex, NULL);
+ seq_printf(m, "Enabled: %s\n",
+ yesno(crtc_state->dsc_params.compression_enable));
+ if (intel_dp->dsc_dpcd)
+ seq_printf(m, "Supported: %s\n",
+ yesno(drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)));
+ drm_modeset_unlock(&crtc->base.mutex);
+
+ return 0;
+}
+
+static ssize_t i915_dsc_support_write(struct file *file,
+ const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ bool dsc_enable = false;
+ int ret;
+ struct drm_connector *connector =
+ ((struct seq_file *)file->private_data)->private;
+ struct intel_encoder *encoder = intel_attached_encoder(connector);
+ struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+
+ if (len == 0)
+ return 0;
+
+ DRM_DEBUG_DRIVER("Copied %d bytes from user to force DSC\n",
+(unsigned int)len);
+
+ ret = kstrtobool_from_user(ubuf, len, &dsc_enable);
+ if (ret < 0)
+ return ret;
+
+ DRM_DEBUG_DRIVER("Got %s for DSC Enable\n",
+(dsc_enable) ? "true" : "false");
+ intel_dp->force_dsc_en = dsc_enable;
+
+ *offp += len;
+ return len;
+}
+
+static int i915_dsc_support_open(struct inode *inode,
+struct file *file)
+{
+ return single_open(file, i915_dsc_support_show,
+ inode->i_private);
+}
+
+static const struct file_operations i915_dsc_support_fops = {
+ .owner = THIS_MODULE,
+ .open = i915_dsc_support_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = i915_dsc_support_write
+};
+
/**
* i915_debugfs_connector_add - add i915 specific connector debugfs files
* @connector: pointer to a registered drm_connector
@@ -5086,6 +5156,7 @@ DEFINE_SHOW_ATTRIBUTE(i915_hdcp_sink_capability);
int i915_debugfs_connector_add(struct drm_connector *connector)
{
struct dentry *root = connector->debugfs_entry;
+ struct drm_i915_private *dev_priv = to_i915(connector->dev);
/* The connector must have been registered beforehands. */
if (!root)
@@ -5110,5 +5181,11 @@ int i915_debugfs_connector_add(struct drm_connector
*connector)
connector, &i915_hdcp_sink_capability_fops);
}
+ if (INTEL_GEN(dev_priv) >= 10 &&
+ (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
+connector->connector_type == DRM_MODE_CONNECTOR_eDP))
+ debugfs_create_file("i915_dsc_support", S_IRUGO, root,
+ connector, &i915_dsc_support_fops);
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b43a77bf42df..99e0dd0e32d6 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2042,7 +2042,7 @@ intel_dp_compute_link
