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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ashmem
import (
"testing"
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/usermem"
)
func TestPinBoard(t *testing.T) {
pb := NewPinBoard()
// Confirm that all pages are pinned.
if !pb.RangePinnedStatus(RangeFromAshmemPin(linux.AshmemPin{0, 0})) {
t.Errorf("RangePinnedStatus(all pages) returned false (unpinned) at start.")
}
// Unpin pages [1, 11) (counting from 0)
pb.UnpinRange(RangeFromAshmemPin(linux.AshmemPin{
usermem.PageSize,
usermem.PageSize * 10,
}))
// Confirm that pages [1, 11) are unpinned and that page 0 and pages
// larger than 10 are pinned.
pinned := []linux.AshmemPin{
{
0,
usermem.PageSize,
}, {
usermem.PageSize * 11,
0,
},
}
for _, pin := range pinned {
if !pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned false (unpinned).",
pin.Offset, pin.Len)
}
}
unpinned := []linux.AshmemPin{
{
usermem.PageSize,
usermem.PageSize * 10,
},
}
for _, pin := range unpinned {
if pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned true (pinned).",
pin.Offset, pin.Len)
}
}
// Pin pages [2, 6).
pb.PinRange(RangeFromAshmemPin(linux.AshmemPin{
usermem.PageSize * 2,
usermem.PageSize * 4,
}))
// Confirm that pages 0, [2, 6) and pages larger than 10 are pinned
// while others remain unpinned.
pinned = []linux.AshmemPin{
{
0,
usermem.PageSize,
},
{
usermem.PageSize * 2,
usermem.PageSize * 4,
},
{
usermem.PageSize * 11,
0,
},
}
for _, pin := range pinned {
if !pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned false (unpinned).",
pin.Offset, pin.Len)
}
}
unpinned = []linux.AshmemPin{
{
usermem.PageSize,
usermem.PageSize,
}, {
usermem.PageSize * 6,
usermem.PageSize * 5,
},
}
for _, pin := range unpinned {
if pb.RangePinnedStatus(RangeFromAshmemPin(pin)) {
t.Errorf("RangePinnedStatus(AshmemPin{offset (pages): %v, len (pages): %v}) returned true (pinned).",
pin.Offset, pin.Len)
}
}
// Status of a partially pinned range is unpinned.
if pb.RangePinnedStatus(RangeFromAshmemPin(linux.AshmemPin{0, 0})) {
t.Errorf("RangePinnedStatus(all pages) returned true (pinned).")
}
// Pin the whole range again.
pb.PinRange(RangeFromAshmemPin(linux.AshmemPin{0, 0}))
// Confirm that all pages are pinned.
if !pb.RangePinnedStatus(RangeFromAshmemPin(linux.AshmemPin{0, 0})) {
t.Errorf("RangePinnedStatus(all pages) returned false (unpinned) at start.")
}
}
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