On 07/11/2019 22:12, Chris Wilson wrote:
In the selftests, where we are accessing a private ctx from within the
confines of a single test, we know that the ctx->vm pointer is static
and bounded by the lifetime of the test. We can use a simple helper to
provide the RCU annotations to keep sparse happy.
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
.../drm/i915/gem/selftests/i915_gem_context.c | 24 +++++++++++--------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index 0d4cdf38d5f9..13ae8f66bed6 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -26,6 +26,12 @@
#define DW_PER_PAGE (PAGE_SIZE / sizeof(u32))
+static inline struct i915_address_space *ctx_vm(struct i915_gem_context *ctx)
+{
+ /* single threaded, private ctx */
+ return rcu_dereference_protected(ctx->vm, true);
+}
+
static int live_nop_switch(void *arg)
{
const unsigned int nctx = 1024;
@@ -787,14 +793,15 @@ static int igt_shared_ctx_exec(void *arg)
}
mutex_lock(&ctx->mutex);
- __assign_ppgtt(ctx, parent->vm);
+ __assign_ppgtt(ctx, ctx_vm(parent));
mutex_unlock(&ctx->mutex);
ce = i915_gem_context_get_engine(ctx, engine->legacy_idx);
GEM_BUG_ON(IS_ERR(ce));
if (!obj) {
- obj = create_test_object(parent->vm, file, &objects);
+ obj = create_test_object(ctx_vm(parent),
+ file, &objects);
if (IS_ERR(obj)) {
err = PTR_ERR(obj);
intel_context_put(ce);
@@ -1344,14 +1351,11 @@ static int igt_ctx_readonly(void *arg)
goto out_file;
}
- rcu_read_lock();
- vm = rcu_dereference(ctx->vm) ?: &i915->ggtt.alias->vm;
+ vm = ctx_vm(ctx) ?: &i915->ggtt.alias->vm;
if (!vm || !vm->has_read_only) {
- rcu_read_unlock();
err = 0;
goto out_file;
}
- rcu_read_unlock();
ndwords = 0;
dw = 0;
@@ -1381,7 +1385,7 @@ static int igt_ctx_readonly(void *arg)
pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) [full-ppgtt? %s], err=%d\n",
ndwords, dw, max_dwords(obj),
ce->engine->name,
- yesno(!!rcu_access_pointer(ctx->vm)),
+ yesno(!!ctx_vm(ctx)),
err);
i915_gem_context_unlock_engines(ctx);
goto out_file;
@@ -1699,11 +1703,11 @@ static int igt_vm_isolation(void *arg)
}
/* We can only test vm isolation, if the vm are distinct */
- if (ctx_a->vm == ctx_b->vm)
+ if (ctx_vm(ctx_a) == ctx_vm(ctx_b))
goto out_file;
- vm_total = ctx_a->vm->total;
- GEM_BUG_ON(ctx_b->vm->total != vm_total);
+ vm_total = ctx_vm(ctx_a)->total;
+ GEM_BUG_ON(ctx_vm(ctx_b)->total != vm_total);
vm_total -= I915_GTT_PAGE_SIZE;
count = 0;
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