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authorTakashi Iwai <tiwai@suse.de>2018-07-09 17:53:02 +0200
committerTakashi Iwai <tiwai@suse.de>2018-07-09 17:53:20 +0200
commit08767e84b9c17fa17b4b0f26b36c6aaec2d2a314 (patch)
tree71bb87f520eb4f0d4e55ec66dd8c63aae15358cd
parentf2fda2f9886c2499653e305e377f386f978459b0 (diff)
drm/i915: Fix context ban and hang accounting for client
(bsc#1051510). suse-commit: f8dc37506e1f4920256ecda3683189db1b3d39a0
-rw-r--r--drivers/gpu/drm/i915/i915_drv.h21
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c57
-rw-r--r--drivers/gpu/drm/i915/i915_gem_context.c2
3 files changed, 55 insertions, 25 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index afe52d5d120a..1c08114dde1b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -332,14 +332,21 @@ struct drm_i915_file_private {
unsigned int bsd_engine;
-/* Client can have a maximum of 3 contexts banned before
- * it is denied of creating new contexts. As one context
- * ban needs 4 consecutive hangs, and more if there is
- * progress in between, this is a last resort stop gap measure
- * to limit the badly behaving clients access to gpu.
+/*
+ * Every context ban increments per client ban score. Also
+ * hangs in short succession increments ban score. If ban threshold
+ * is reached, client is considered banned and submitting more work
+ * will fail. This is a stop gap measure to limit the badly behaving
+ * clients access to gpu. Note that unbannable contexts never increment
+ * the client ban score.
*/
-#define I915_MAX_CLIENT_CONTEXT_BANS 3
- atomic_t context_bans;
+#define I915_CLIENT_SCORE_HANG_FAST 1
+#define I915_CLIENT_FAST_HANG_JIFFIES (60 * HZ)
+#define I915_CLIENT_SCORE_CONTEXT_BAN 3
+#define I915_CLIENT_SCORE_BANNED 9
+ /** ban_score: Accumulated score of all ctx bans and fast hangs. */
+ atomic_t ban_score;
+ unsigned long hang_timestamp;
};
/* Interface history:
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dc5175614b2e..e07629be2d6a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2809,32 +2809,54 @@ i915_gem_object_pwrite_gtt(struct drm_i915_gem_object *obj,
return 0;
}
+static void i915_gem_client_mark_guilty(struct drm_i915_file_private *file_priv,
+ const struct i915_gem_context *ctx)
+{
+ unsigned int score;
+ unsigned long prev_hang;
+
+ if (i915_gem_context_is_banned(ctx))
+ score = I915_CLIENT_SCORE_CONTEXT_BAN;
+ else
+ score = 0;
+
+ prev_hang = xchg(&file_priv->hang_timestamp, jiffies);
+ if (time_before(jiffies, prev_hang + I915_CLIENT_FAST_HANG_JIFFIES))
+ score += I915_CLIENT_SCORE_HANG_FAST;
+
+ if (score) {
+ atomic_add(score, &file_priv->ban_score);
+
+ DRM_DEBUG_DRIVER("client %s: gained %u ban score, now %u\n",
+ ctx->name, score,
+ atomic_read(&file_priv->ban_score));
+ }
+}
+
static void i915_gem_context_mark_guilty(struct i915_gem_context *ctx)
{
- bool banned;
+ unsigned int score;
+ bool banned, bannable;
atomic_inc(&ctx->guilty_count);
- banned = false;
- if (i915_gem_context_is_bannable(ctx)) {
- unsigned int score;
+ bannable = i915_gem_context_is_bannable(ctx);
+ score = atomic_add_return(CONTEXT_SCORE_GUILTY, &ctx->ban_score);
+ banned = score >= CONTEXT_SCORE_BAN_THRESHOLD;
- score = atomic_add_return(CONTEXT_SCORE_GUILTY,
- &ctx->ban_score);
- banned = score >= CONTEXT_SCORE_BAN_THRESHOLD;
+ DRM_DEBUG_DRIVER("context %s: guilty %d, score %u, ban %s\n",
+ ctx->name, atomic_read(&ctx->guilty_count),
+ score, yesno(banned && bannable));
- DRM_DEBUG_DRIVER("context %s marked guilty (score %d) banned? %s\n",
- ctx->name, score, yesno(banned));
- }
- if (!banned)
+ /* Cool contexts don't accumulate client ban score */
+ if (!bannable)
return;
- i915_gem_context_set_banned(ctx);
- if (!IS_ERR_OR_NULL(ctx->file_priv)) {
- atomic_inc(&ctx->file_priv->context_bans);
- DRM_DEBUG_DRIVER("client %s has had %d context banned\n",
- ctx->name, atomic_read(&ctx->file_priv->context_bans));
- }
+ if (banned)
+ i915_gem_context_set_banned(ctx);
+
+ if (!IS_ERR_OR_NULL(ctx->file_priv))
+ i915_gem_client_mark_guilty(ctx->file_priv, ctx);
}
static void i915_gem_context_mark_innocent(struct i915_gem_context *ctx)
@@ -5483,6 +5505,7 @@ int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
INIT_LIST_HEAD(&file_priv->mm.request_list);
file_priv->bsd_engine = -1;
+ file_priv->hang_timestamp = jiffies;
ret = i915_gem_context_open(i915, file);
if (ret)
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 0c963fcf31ff..2fab4edf05b6 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -635,7 +635,7 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv)
static bool client_is_banned(struct drm_i915_file_private *file_priv)
{
- return atomic_read(&file_priv->context_bans) > I915_MAX_CLIENT_CONTEXT_BANS;
+ return atomic_read(&file_priv->ban_score) >= I915_CLIENT_SCORE_BANNED;
}
int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,