[Intel-gfx] [PATCH 19/31] drm/i915: Add an i915_gem_vm_lookup helper

[Jason Ekstrand]

This is the VM equivalent of i915_gem_context_lookup.  It's only used
once in this patch but future patches will need to duplicate this lookup
code so it's better to have it in a helper.

Signed-off-by: Jason Ekstrand <ja...@jlekstrand.net>
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c |  6 +-----
 drivers/gpu/drm/i915/i915_drv.h             | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c 
b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index e62482477c771..8e7c0e3f070ed 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -1352,11 +1352,7 @@ static int set_ppgtt(struct drm_i915_file_private 
*file_priv,
        if (upper_32_bits(args->value))
                return -ENOENT;
 
-       rcu_read_lock();
-       vm = xa_load(&file_priv->vm_xa, args->value);
-       if (vm && !kref_get_unless_zero(&vm->ref))
-               vm = NULL;
-       rcu_read_unlock();
+       vm = i915_gem_vm_lookup(file_priv, args->value);
        if (!vm)
                return -ENOENT;
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index fed14ffc52437..b191946229746 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1864,6 +1864,20 @@ i915_gem_context_lookup(struct drm_i915_file_private 
*file_priv, u32 id)
        return ctx;
 }
 
+static inline struct i915_address_space *
+i915_gem_vm_lookup(struct drm_i915_file_private *file_priv, u32 id)
+{
+       struct i915_address_space *vm;
+
+       rcu_read_lock();
+       vm = xa_load(&file_priv->vm_xa, id);
+       if (vm && !kref_get_unless_zero(&vm->ref))
+               vm = NULL;
+       rcu_read_unlock();
+
+       return vm;
+}
+
 /* i915_gem_evict.c */
 int __must_check i915_gem_evict_something(struct i915_address_space *vm,
                                          u64 min_size, u64 alignment,
-- 
2.31.1

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