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| author |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2021-09-02 16:20:56 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2021-09-06 11:11:45 +0200 |
| commit | 843151521844af6c3e22d4bef42d292c04f05fa2 (patch) | |
| tree | dc3208f1a563be6651e2e0352778dff9da32ae81 /drivers/gpu/drm/i915/i915_drv.h | |
| parent | drm/i915: Drop __rcu from gem_context->vm (diff) | |
| download | linux-dev-843151521844af6c3e22d4bef42d292c04f05fa2.tar.xz linux-dev-843151521844af6c3e22d4bef42d292c04f05fa2.zip | |
drm/i915: use xa_lock/unlock for fpriv->vm_xa lookups
We don't need the absolute speed of rcu for this. And
i915_address_space in general dont need rcu protection anywhere else,
after we've made gem contexts and engines a lot more immutable.
Note that this semantically reverts
commit aabbe344dc3ca5f7d8263a02608ba6179e8a4499
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri Aug 30 19:03:25 2019 +0100
drm/i915: Use RCU for unlocked vm_idr lookup
except we have the conversion from idr to xarray in between.
v2: kref_get_unless_zero is no longer required (Maarten)
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20210902142057.929669-10-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 0558921663d9..94175a49c151 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1888,11 +1888,11 @@ i915_gem_vm_lookup(struct drm_i915_file_private *file_priv, u32 id) { struct i915_address_space *vm; - rcu_read_lock(); + xa_lock(&file_priv->vm_xa); vm = xa_load(&file_priv->vm_xa, id); - if (vm && !kref_get_unless_zero(&vm->ref)) - vm = NULL; - rcu_read_unlock(); + if (vm) + kref_get(&vm->ref); + xa_unlock(&file_priv->vm_xa); return vm; } |