We can do less work during driver load by deferring some of it until
the first time the device is opened; in particular, the function
i915_gem_init_hw_late() introduced by the previous patch. This should
allow the system to get out of the early single-threaded phase of
system initialisation and into full multi-user mode somewhat quicker.
In addition, we expect that by the time of the first open, not only
the driver's software structures but also system-specific items such
as filesystem mounting have been fully initialised, meaning that the
late initialisation code can run in a much more complete environment
than the driver_load stage presents. This can be important for
embedded programmable devices that need firmware loaded from a file
before they can be used.
Signed-off-by: Dave Gordon <david.s.gordon@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gem.c | 4 +++-
drivers/gpu/drm/i915/i915_gem_context.c | 32 ++++++++++++++++++++++++++-----
3 files changed, 31 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bc7c510..ba63804 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1845,6 +1845,7 @@ struct drm_i915_private {
/* hda/i915 audio component */
bool audio_component_registered;
+ bool contexts_ready;
uint32_t hw_context_size;
struct list_head context_list;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1887e60..0cb962f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5073,7 +5073,9 @@ i915_gem_init_hw(struct drm_device *dev)
goto out;
}
- ret = i915_gem_init_hw_late(dev);
+ /* Don't do late init on the first time through here */
+ if (dev_priv->contexts_ready)
+ ret = i915_gem_init_hw_late(dev);
out:
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index a7e58a8..917c867 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -438,23 +438,45 @@ static int context_idr_cleanup(int id, void *p, void *data)
return 0;
}
+/* Complete any late initialisation here */
+static int i915_gem_context_first_open(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int ret;
+
+ ret = i915_gem_init_hw_late(dev);
+ if (ret == 0)
+ dev_priv->contexts_ready = true;
+
+ return ret;
+}
+
int i915_gem_context_open(struct drm_device *dev, struct drm_file *file)
{
+ struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_file_private *file_priv = file->driver_priv;
struct intel_context *ctx;
+ int ret = 0;
idr_init(&file_priv->context_idr);
mutex_lock(&dev->struct_mutex);
- ctx = i915_gem_create_context(dev, file_priv);
+
+ if (!dev_priv->contexts_ready)
+ ret = i915_gem_context_first_open(dev);
+
+ if (ret == 0) {
+ ctx = i915_gem_create_context(dev, file_priv);
+ if (IS_ERR(ctx))
+ ret = PTR_ERR(ctx);
+ }
+
mutex_unlock(&dev->struct_mutex);
- if (IS_ERR(ctx)) {
+ if (ret)
idr_destroy(&file_priv->context_idr);
- return PTR_ERR(ctx);
- }
- return 0;
+ return ret;
}
void i915_gem_context_close(struct drm_device *dev, struct drm_file *file)
--
1.7.9.5
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