PIN_USER
err = i915_vma_pin(batch, 0, 0, PIN_USER | PIN_NONBLOCK);
pin_flags |= PIN_USER | PIN_NOEVICT | PIN_OFFSET_FIXED;
pin_flags = PIN_USER | PIN_NONBLOCK;
if (flags & PIN_USER)
GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0);
BUILD_BUG_ON(PIN_USER != I915_VMA_LOCAL_BIND);