@@ -436,12 +436,39 @@ static void context_close(struct i915_gem_context *ctx)
* case we opt to forcibly kill off all remaining requests on
* context close.
*/
- if (!i915_modparams.enable_hangcheck)
+ if (!i915_gem_context_is_persistent(ctx) ||
+ !i915_modparams.enable_hangcheck)
kill_context(ctx);
i915_gem_context_put(ctx);
}
+static int __context_set_persistence(struct i915_gem_context *ctx, bool state)
+{
+ if (i915_gem_context_is_persistent(ctx) == state)
+ return 0;
+
+ if (state) {
+ /*
+ * Only contexts that are short-lived [that will expire or be
+ * reset] are allowed to survive past termination. We require
+ * hangcheck to ensure that the persistent requests are healthy.
+ */
+ if (!i915_modparams.enable_hangcheck)
+ return -EINVAL;
+
+ i915_gem_context_set_persistence(ctx);
+ } else {
+ /* To cancel a context we use "preempt-to-idle" */
+ if (!(ctx->i915->caps.scheduler & I915_SCHEDULER_CAP_PREEMPTION))
+ return -ENODEV;
+
+ i915_gem_context_clear_persistence(ctx);
+ }
+
+ return 0;
+}
+
static struct i915_gem_context *
__create_context(struct drm_i915_private *i915)
{
@@ -476,6 +503,7 @@ __create_context(struct drm_i915_private *i915)
i915_gem_context_set_bannable(ctx);
i915_gem_context_set_recoverable(ctx);
+ __context_set_persistence(ctx, true /* cgroup hook? */);
for (i = 0; i < ARRAY_SIZE(ctx->hang_timestamp); i++)
ctx->hang_timestamp[i] = jiffies - CONTEXT_FAST_HANG_JIFFIES;
@@ -632,6 +660,7 @@ i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio)
return ctx;
i915_gem_context_clear_bannable(ctx);
+ i915_gem_context_set_persistence(ctx);
ctx->sched.priority = I915_USER_PRIORITY(prio);
GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
@@ -1742,6 +1771,16 @@ get_engines(struct i915_gem_context *ctx,
return err;
}
+static int
+set_persistence(struct i915_gem_context *ctx,
+ const struct drm_i915_gem_context_param *args)
+{
+ if (args->size)
+ return -EINVAL;
+
+ return __context_set_persistence(ctx, args->value);
+}
+
static int ctx_setparam(struct drm_i915_file_private *fpriv,
struct i915_gem_context *ctx,
struct drm_i915_gem_context_param *args)
@@ -1819,6 +1858,10 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv,
ret = set_engines(ctx, args);
break;
+ case I915_CONTEXT_PARAM_PERSISTENCE:
+ ret = set_persistence(ctx, args);
+ break;
+
case I915_CONTEXT_PARAM_BAN_PERIOD:
default:
ret = -EINVAL;
@@ -2271,6 +2314,11 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
ret = get_engines(ctx, args);
break;
+ case I915_CONTEXT_PARAM_PERSISTENCE:
+ args->size = 0;
+ args->value = i915_gem_context_is_persistent(ctx);
+ break;
+
case I915_CONTEXT_PARAM_BAN_PERIOD:
default:
ret = -EINVAL;
@@ -76,6 +76,21 @@ static inline void i915_gem_context_clear_recoverable(struct i915_gem_context *c
clear_bit(UCONTEXT_RECOVERABLE, &ctx->user_flags);
}
+static inline bool i915_gem_context_is_persistent(const struct i915_gem_context *ctx)
+{
+ return test_bit(UCONTEXT_PERSISTENCE, &ctx->user_flags);
+}
+
+static inline void i915_gem_context_set_persistence(struct i915_gem_context *ctx)
+{
+ set_bit(UCONTEXT_PERSISTENCE, &ctx->user_flags);
+}
+
+static inline void i915_gem_context_clear_persistence(struct i915_gem_context *ctx)
+{
+ clear_bit(UCONTEXT_PERSISTENCE, &ctx->user_flags);
+}
+
static inline bool i915_gem_context_is_banned(const struct i915_gem_context *ctx)
{
return test_bit(CONTEXT_BANNED, &ctx->flags);
@@ -137,6 +137,7 @@ struct i915_gem_context {
#define UCONTEXT_NO_ERROR_CAPTURE 1
#define UCONTEXT_BANNABLE 2
#define UCONTEXT_RECOVERABLE 3
+#define UCONTEXT_PERSISTENCE 4
/**
* @flags: small set of booleans
@@ -22,6 +22,8 @@ mock_context(struct drm_i915_private *i915,
INIT_LIST_HEAD(&ctx->link);
ctx->i915 = i915;
+ i915_gem_context_set_persistence(ctx);
+
mutex_init(&ctx->engines_mutex);
e = default_engines(ctx);
if (IS_ERR(e))
@@ -1572,6 +1572,21 @@ struct drm_i915_gem_context_param {
* i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND)
*/
#define I915_CONTEXT_PARAM_ENGINES 0xa
+
+/*
+ * I915_CONTEXT_PARAM_PERSISTENCE:
+ *
+ * Allow the context and active rendering to survive the process until
+ * completion. Persistence allows fire-and-forget clients to queue up a
+ * bunch of work, hand the output over to a display server and the quit.
+ * If the context is not marked as persistent, upon closing (either via
+ * an explicit DRM_I915_GEM_CONTEXT_DESTROY or implicitly from file closure
+ * or process termination), the context and any outstanding requests will be
+ * cancelled (and exported fences for cancelled requests marked as -EIO).
+ *
+ * By default, new contexts allow persistence.
+ */
+#define I915_CONTEXT_PARAM_PERSISTENCE 0xb
/* Must be kept compact -- no holes and well documented */
__u64 value;