On 19/04/16 07:49, Chris Wilson wrote:
The hardware tracks contexts and expects all live contexts (those active
on the hardware) to have a unique identifier. This is used by the
hardware to assign pagefaults and the like to a particular context.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 4 ++++
drivers/gpu/drm/i915/i915_gem_context.c | 32 ++++++++++++++++++++++++++++++++
3 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ffc4734cb2dc..cacbe45b7938 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2014,7 +2014,7 @@ static int i915_context_status(struct seq_file *m, void *unused)
ctx->legacy_hw_ctx.rcs_state == NULL)
continue;
- seq_puts(m, "HW context ");
+ seq_printf(m, "HW context %d ", ctx->hw_id);
Should be %u.
describe_ctx(m, ctx);
if (ctx == dev_priv->kernel_context)
seq_printf(m, "(kernel context) ");
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index dc3bb5c10957..368fd7090189 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -851,6 +851,7 @@ struct intel_context {
struct i915_ctx_hang_stats hang_stats;
struct i915_hw_ppgtt *ppgtt;
+ unsigned hw_id;
unsigned flags;
#define CONTEXT_NO_ZEROMAP (1<<0)
#define CONTEXT_NO_ERROR_CAPTURE (1<<1)
@@ -1810,6 +1811,9 @@ struct drm_i915_private {
DECLARE_HASHTABLE(mm_structs, 7);
struct mutex mm_lock;
+ struct ida context_hw_ida;
+#define MAX_CONTEXT_HW_ID (1<<20)
BUILD_BUG_ON somewhere if someone in the future is tempted to increase
this without realizing ids returned by ida_simple_get are limited to
0x80000000 ?
+
/* Kernel Modesetting */
struct drm_crtc *plane_to_crtc_mapping[I915_MAX_PIPES];
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index d7d9763a9818..db53d811370d 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -169,6 +169,8 @@ void i915_gem_context_free(struct kref *ctx_ref)
if (ctx->legacy_hw_ctx.rcs_state)
drm_gem_object_unreference(&ctx->legacy_hw_ctx.rcs_state->base);
list_del(&ctx->link);
+
+ ida_simple_remove(&ctx->i915->context_hw_ida, ctx->hw_id);
kfree(ctx);
}
@@ -209,6 +211,28 @@ i915_gem_alloc_context_obj(struct drm_device *dev, size_t size)
return obj;
}
+static int assign_hw_id(struct drm_i915_private *dev_priv, unsigned *out)
+{
+ int ret;
+
+ ret = ida_simple_get(&dev_priv->context_hw_ida,
+ 0, MAX_CONTEXT_HW_ID, GFP_KERNEL);
+ if (ret < 0) {
+ /* Contexts are only released when no longer active.
+ * Flush any pending retires to hopefully release some
+ * stale contexts and try again.
+ */
+ i915_gem_retire_requests(dev_priv->dev);
+ ret = ida_simple_get(&dev_priv->context_hw_ida,
+ 0, MAX_CONTEXT_HW_ID, GFP_KERNEL);
+ if (ret < 0)
+ return ret;
+ }
+
+ *out = ret;
+ return 0;
+}
+
static struct intel_context *
__create_hw_context(struct drm_device *dev,
struct drm_i915_file_private *file_priv)
@@ -225,6 +249,12 @@ __create_hw_context(struct drm_device *dev,
list_add_tail(&ctx->link, &dev_priv->context_list);
ctx->i915 = dev_priv;
+ ret = assign_hw_id(dev_priv, &ctx->hw_id);
+ if (ret) {
+ kfree(ctx);
+ return ERR_PTR(ret);
+ }
+
if (dev_priv->hw_context_size) {
struct drm_i915_gem_object *obj =
i915_gem_alloc_context_obj(dev, dev_priv->hw_context_size);
@@ -375,6 +405,8 @@ int i915_gem_context_init(struct drm_device *dev)
}
}
+ ida_init(&dev_priv->context_hw_ida);
+
if (i915.enable_execlists) {
/* NB: intentionally left blank. We will allocate our own
* backing objects as we need them, thank you very much */
Otherwise looks fine. With the two minors above added:
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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