From b083a0870c7937e131762f8b702afa6bac8d08f4 Mon Sep 17 00:00:00 2001 From: Mika Kuoppala Date: Fri, 18 Nov 2016 15:10:47 +0200 Subject: [PATCH] drm/i915: Add per client max context ban limit If we have a bad client submitting unfavourably across different contexts, creating new ones, the per context scoring of badness doesn't remove the root cause, the offending client. To counter, keep track of per client context bans. Deny access if client is responsible for more than 3 context bans in it's lifetime. v2: move ban check to context create ioctl (Chris) v3: add commentary about hangs needed to reach client ban (Chris) Cc: Chris Wilson Reviewed-by: Chris Wilson Signed-off-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_drv.h | 10 ++++++++++ drivers/gpu/drm/i915/i915_gem.c | 14 ++++++++++++++ drivers/gpu/drm/i915/i915_gem_context.c | 13 +++++++++++++ drivers/gpu/drm/i915/i915_gpu_error.c | 10 ++++++---- 4 files changed, 43 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 7db7b37937e7..1f0b5c37f6de 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -416,6 +416,15 @@ struct drm_i915_file_private { } rps; 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. + */ +#define I915_MAX_CLIENT_CONTEXT_BANS 3 + int context_bans; }; /* Used by dp and fdi links */ @@ -872,6 +881,7 @@ struct drm_i915_error_state { pid_t pid; char comm[TASK_COMM_LEN]; + int context_bans; } engine[I915_NUM_ENGINES]; struct drm_i915_error_buffer { diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 99198146ecc8..a8118386a23b 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2646,6 +2646,20 @@ static void i915_gem_context_mark_guilty(struct i915_gem_context *ctx) hs->banned = i915_context_is_banned(ctx); hs->batch_active++; + + DRM_DEBUG_DRIVER("context %s marked guilty (score %d) banned? %s\n", + ctx->name, hs->ban_score, yesno(hs->banned)); + + if (!ctx->file_priv) + return; + + if (hs->banned) { + ctx->file_priv->context_bans++; + + DRM_DEBUG_DRIVER("client %s has has %d context banned\n", + ctx->name, + ctx->file_priv->context_bans); + } } static void i915_gem_context_mark_innocent(struct i915_gem_context *ctx) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 97012373a8d5..88d59866c433 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -1003,6 +1003,11 @@ static bool contexts_enabled(struct drm_device *dev) return i915.enable_execlists || to_i915(dev)->hw_context_size; } +static bool client_is_banned(struct drm_i915_file_private *file_priv) +{ + return file_priv->context_bans > I915_MAX_CLIENT_CONTEXT_BANS; +} + int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { @@ -1017,6 +1022,14 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, if (args->pad != 0) return -EINVAL; + if (client_is_banned(file_priv)) { + DRM_DEBUG("client %s[%d] banned from creating ctx\n", + current->comm, + pid_nr(get_task_pid(current, PIDTYPE_PID))); + + return -EIO; + } + ret = i915_mutex_lock_interruptible(dev); if (ret) return ret; diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index fa988a00ae68..af4f0ef4fa08 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -538,10 +538,11 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m, for (i = 0; i < ARRAY_SIZE(error->engine); i++) { if (error->engine[i].hangcheck_stalled && error->engine[i].pid != -1) { - err_printf(m, "Active process (on ring %s): %s [%d]\n", + err_printf(m, "Active process (on ring %s): %s [%d], context bans %d\n", engine_str(i), error->engine[i].comm, - error->engine[i].pid); + error->engine[i].pid, + error->engine[i].context_bans); } } err_printf(m, "Reset count: %u\n", error->reset_count); @@ -632,9 +633,10 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m, if (obj) { err_puts(m, dev_priv->engine[i]->name); if (ee->pid != -1) - err_printf(m, " (submitted by %s [%d])", + err_printf(m, " (submitted by %s [%d], bans %d)", ee->comm, - ee->pid); + ee->pid, + ee->context_bans); err_printf(m, " --- gtt_offset = 0x%08x %08x\n", upper_32_bits(obj->gtt_offset), lower_32_bits(obj->gtt_offset)); -- 2.20.1