From db80a1294c231b6ac725085f046bb2931e00c9db Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 18 Jan 2021 11:08:54 +0000 Subject: [PATCH] drm/i915/gem: Remove per-client stats from debugfs/i915_gem_objects Rather than trying to avoid the use-after-free possible with the current context chasing, simply remove presentation of the per-client stats from debugfs. While we know from bug reports that this debugfs/i915_gem_objects has been used by chromeos (and chrome itself) for debug purposes, google suggests that it is unparsed, so we are free to invoke debugfs is not ABI and remove details from it. Suggested-by: Tvrtko Ursulin Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Reviewed-by: Tvrtko Ursulin Link: https://patchwork.freedesktop.org/patch/msgid/20210118110854.1873-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_debugfs.c | 142 ------------------------------------ 1 file changed, 142 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index de8e0e4..437da31 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -220,145 +220,6 @@ i915_debugfs_describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj) seq_printf(m, " (%s)", engine->name); } -struct file_stats { - struct i915_address_space *vm; - unsigned long count; - u64 total; - u64 active, inactive; - u64 closed; -}; - -static int per_file_stats(int id, void *ptr, void *data) -{ - struct drm_i915_gem_object *obj = ptr; - struct file_stats *stats = data; - struct i915_vma *vma; - - if (IS_ERR_OR_NULL(obj) || !kref_get_unless_zero(&obj->base.refcount)) - return 0; - - stats->count++; - stats->total += obj->base.size; - - spin_lock(&obj->vma.lock); - if (!stats->vm) { - for_each_ggtt_vma(vma, obj) { - if (!drm_mm_node_allocated(&vma->node)) - continue; - - if (i915_vma_is_active(vma)) - stats->active += vma->node.size; - else - stats->inactive += vma->node.size; - - if (i915_vma_is_closed(vma)) - stats->closed += vma->node.size; - } - } else { - struct rb_node *p = obj->vma.tree.rb_node; - - while (p) { - long cmp; - - vma = rb_entry(p, typeof(*vma), obj_node); - cmp = i915_vma_compare(vma, stats->vm, NULL); - if (cmp == 0) { - if (drm_mm_node_allocated(&vma->node)) { - if (i915_vma_is_active(vma)) - stats->active += vma->node.size; - else - stats->inactive += vma->node.size; - - if (i915_vma_is_closed(vma)) - stats->closed += vma->node.size; - } - break; - } - if (cmp < 0) - p = p->rb_right; - else - p = p->rb_left; - } - } - spin_unlock(&obj->vma.lock); - - i915_gem_object_put(obj); - return 0; -} - -#define print_file_stats(m, name, stats) do { \ - if (stats.count) \ - seq_printf(m, "%s: %lu objects, %llu bytes (%llu active, %llu inactive, %llu closed)\n", \ - name, \ - stats.count, \ - stats.total, \ - stats.active, \ - stats.inactive, \ - stats.closed); \ -} while (0) - -static void print_context_stats(struct seq_file *m, - struct drm_i915_private *i915) -{ - struct file_stats kstats = {}; - struct i915_gem_context *ctx, *cn; - - spin_lock(&i915->gem.contexts.lock); - list_for_each_entry_safe(ctx, cn, &i915->gem.contexts.list, link) { - struct i915_gem_engines_iter it; - struct intel_context *ce; - - if (!kref_get_unless_zero(&ctx->ref)) - continue; - - spin_unlock(&i915->gem.contexts.lock); - - for_each_gem_engine(ce, - i915_gem_context_lock_engines(ctx), it) { - if (intel_context_pin_if_active(ce)) { - rcu_read_lock(); - if (ce->state) - per_file_stats(0, - ce->state->obj, &kstats); - per_file_stats(0, ce->ring->vma->obj, &kstats); - rcu_read_unlock(); - intel_context_unpin(ce); - } - } - i915_gem_context_unlock_engines(ctx); - - mutex_lock(&ctx->mutex); - if (!IS_ERR_OR_NULL(ctx->file_priv)) { - struct file_stats stats = { - .vm = rcu_access_pointer(ctx->vm), - }; - struct drm_file *file = ctx->file_priv->file; - struct task_struct *task; - char name[80]; - - rcu_read_lock(); - idr_for_each(&file->object_idr, per_file_stats, &stats); - rcu_read_unlock(); - - rcu_read_lock(); - task = pid_task(ctx->pid ?: file->pid, PIDTYPE_PID); - snprintf(name, sizeof(name), "%s", - task ? task->comm : ""); - rcu_read_unlock(); - - print_file_stats(m, name, stats); - } - mutex_unlock(&ctx->mutex); - - spin_lock(&i915->gem.contexts.lock); - list_safe_reset_next(ctx, cn, link); - i915_gem_context_put(ctx); - } - spin_unlock(&i915->gem.contexts.lock); - - print_file_stats(m, "[k]contexts", kstats); -} - static int i915_gem_object_info(struct seq_file *m, void *data) { struct drm_i915_private *i915 = node_to_i915(m->private); @@ -372,9 +233,6 @@ static int i915_gem_object_info(struct seq_file *m, void *data) for_each_memory_region(mr, i915, id) seq_printf(m, "%s: total:%pa, available:%pa bytes\n", mr->name, &mr->total, &mr->avail); - seq_putc(m, '\n'); - - print_context_stats(m, i915); return 0; } -- 2.7.4