[PATCH 4/6] drm/i915: Keep a list of all contexts

Ben Widawsky
2013-09-18T04:13:20Z

I have implemented this patch before without creating a separate list
(I'm having trouble finding the links, but the messages ids are:
<1364942743-6041-2-git-send-email-ben@bwidawsk.net>
<1365118914-15753-9-git-send-email-ben@bwidawsk.net>)

However, the code is much simpler to just use a list and it makes the
code from the next patch a lot more pretty.

As you'll see in the next patch, the reason for this is to be able to
specify when a context needs to get L3 remapping. More details there.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
drivers/gpu/drm/i915/i915_debugfs.c | 15 +++++++++------
drivers/gpu/drm/i915/i915_drv.h | 3 +++
drivers/gpu/drm/i915/i915_gem.c | 1 +
drivers/gpu/drm/i915/i915_gem_context.c | 3 +++
4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1d77624..ada0950 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1442,6 +1442,7 @@ static int i915_context_status(struct seq_file *m, void *unused)
struct drm_device *dev = node->minor->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
struct intel_ring_buffer *ring;
+ struct i915_hw_context *ctx;
int ret, i;

ret = mutex_lock_interruptible(&dev->mode_config.mutex);
@@ -1460,12 +1461,14 @@ static int i915_context_status(struct seq_file *m, void *unused)
seq_putc(m, '\n');
}

- for_each_ring(ring, dev_priv, i) {
- if (ring->default_context) {
- seq_printf(m, "HW default context %s ", ring->name);
- describe_obj(m, ring->default_context->obj);
- seq_putc(m, '\n');
- }
+ list_for_each_entry(ctx, &dev_priv->context_list, link) {
+ seq_puts(m, "HW context ");
+ for_each_ring(ring, dev_priv, i)
+ if (ring->default_context == ctx)
+ seq_printf(m, "(default context %s) ", ring->name);
+
+ describe_obj(m, ctx->obj);
+ seq_putc(m, '\n');
}

mutex_unlock(&dev->mode_config.mutex);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0c39805..1795927 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -605,6 +605,8 @@ struct i915_hw_context {
struct intel_ring_buffer *ring;
struct drm_i915_gem_object *obj;
struct i915_ctx_hang_stats hang_stats;
+
+ struct list_head link;
};

struct i915_fbc {
@@ -1343,6 +1345,7 @@ typedef struct drm_i915_private {

bool hw_contexts_disabled;
uint32_t hw_context_size;
+ struct list_head context_list;

u32 fdi_rx_config;

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 2538138..18d07d7 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4569,6 +4569,7 @@ i915_gem_load(struct drm_device *dev)
INIT_LIST_HEAD(&dev_priv->vm_list);
i915_init_vm(dev_priv, &dev_priv->gtt.base);

+ INIT_LIST_HEAD(&dev_priv->context_list);
INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
INIT_LIST_HEAD(&dev_priv->mm.bound_list);
INIT_LIST_HEAD(&dev_priv->mm.fence_list);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 26c3fcc..2bbdce8 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -129,6 +129,7 @@ void i915_gem_context_free(struct kref *ctx_ref)
struct i915_hw_context *ctx = container_of(ctx_ref,
typeof(*ctx), ref);

+ list_del(&ctx->link);
drm_gem_object_unreference(&ctx->obj->base);
kfree(ctx);
}
@@ -147,6 +148,7 @@ create_hw_context(struct drm_device *dev,

kref_init(&ctx->ref);
ctx->obj = i915_gem_alloc_object(dev, dev_priv->hw_context_size);
+ INIT_LIST_HEAD(&ctx->link);
if (ctx->obj == NULL) {
kfree(ctx);
DRM_DEBUG_DRIVER("Context object allocated failed\n");
@@ -166,6 +168,7 @@ create_hw_context(struct drm_device *dev,
* assertion in the context switch code.
*/
ctx->ring = &dev_priv->ring[RCS];
+ list_add_tail(&ctx->link, &dev_priv->context_list);

/* Default context will never have a file_priv */
if (file_priv == NULL)
--
1.8.4