diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-06-20 12:05:47 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-06-20 17:13:54 +0100 |
| commit | 1acfc104cdf8a3408f0e83b4115d4419c6315005 (patch) | |
| tree | 34bb5200d992f514e11e1482f17466a577931bc0 /drivers/gpu/drm/i915/i915_drv.h | |
| parent | 5f09a9c8ab6b16eefbcf81635330d68481af1edc (diff) | |
drm/i915: Enable rcu-only context lookups
Whilst the contents of the context is still protected by the big
struct_mutex, this is not much of an improvement. It is just one tiny
step towards reducing our BKL.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170620110547.15947-3-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 0f1330adc37b..69219b5d1198 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -3534,15 +3534,21 @@ void i915_gem_object_save_bit_17_swizzle(struct drm_i915_gem_object *obj, struct sg_table *pages); static inline struct i915_gem_context * +__i915_gem_context_lookup_rcu(struct drm_i915_file_private *file_priv, u32 id) +{ + return idr_find(&file_priv->context_idr, id); +} + +static inline struct i915_gem_context * i915_gem_context_lookup(struct drm_i915_file_private *file_priv, u32 id) { struct i915_gem_context *ctx; - lockdep_assert_held(&file_priv->dev_priv->drm.struct_mutex); - - ctx = idr_find(&file_priv->context_idr, id); - if (!ctx) - return ERR_PTR(-ENOENT); + rcu_read_lock(); + ctx = __i915_gem_context_lookup_rcu(file_priv, id); + if (ctx && !kref_get_unless_zero(&ctx->ref)) + ctx = NULL; + rcu_read_unlock(); return ctx; } |