ASoC: Add support for GPIOs driven amplifiers

Herve Codina <herve.codina@bootlin.com> says:

On some embedded system boards, audio amplifiers are designed using
discrete components such as op-amp, several resistors and switches to
either adjust the gain (switching resistors) or fully switch the
audio signal path (mute and/or bypass features).

Those switches are usually driven by simple GPIOs.

This kind of amplifiers are not handled in ASoC and the fallback is to
let the user-space handle those GPIOs out of the ALSA world.

In order to have those kind of amplifiers fully integrated in the audio
stack, this series introduces the audio-gpio-amp to handle them.

This new ASoC component allows to have the amplifiers seen as ASoC
auxiliarty devices and so it allows to control them through audio mixer
controls.

In order to ease the review, I choose to split modifications related
to the merge of the gpio-audio-amp part into the simple-amplfier driver
in several commits.

Link: https://patch.msgid.link/20260513081702.317117-1-herve.codina@bootlin.com

9 files changed, 95 insertions, 10 deletions

diff --git a/tools/testing/selftests/cgroup/lib/cgroup_util.c b/tools/testing/selftests/cgroup/lib/cgroup_util.c
index 6a7295347e90..42f54936f4bb 100644
--- a/tools/testing/selftests/cgroup/lib/cgroup_util.c
+++ b/tools/testing/selftests/cgroup/lib/cgroup_util.c
@@ -106,8 +106,9 @@ int cg_read_strcmp(const char *cgroup, const char *control,
 	/* Handle the case of comparing against empty string */
 	if (!expected)
 		return -1;
-	else
-		size = strlen(expected) + 1;
+
+	/* needs size > 1, otherwise cg_read() reads 0 bytes */
+	size = (expected[0] == '\0') ? 2 : strlen(expected) + 1;
 
 	buf = malloc(size);
 	if (!buf)
diff --git a/tools/testing/selftests/cgroup/test_cpuset_v1_base.sh b/tools/testing/selftests/cgroup/test_cpuset_v1_base.sh
index 42a6628fb8bc..1c0444729e70 100755
--- a/tools/testing/selftests/cgroup/test_cpuset_v1_base.sh
+++ b/tools/testing/selftests/cgroup/test_cpuset_v1_base.sh
@@ -18,7 +18,7 @@ write_test() {
 	echo "testing $interface $value"
 	echo $value > $dir/$interface
 	new=$(cat $dir/$interface)
-	[[ $value -ne $(cat $dir/$interface) ]] && {
+	[[ "$value" != "$new" ]] && {
 		echo "$interface write $value failed: new:$new"
 		exit 1
 	}
diff --git a/tools/testing/selftests/cgroup/test_kmem.c b/tools/testing/selftests/cgroup/test_kmem.c
index eeabd34bf083..12f59925500b 100644
--- a/tools/testing/selftests/cgroup/test_kmem.c
+++ b/tools/testing/selftests/cgroup/test_kmem.c
@@ -368,11 +368,15 @@ static int test_percpu_basic(const char *root)
 
 	for (i = 0; i < 1000; i++) {
 		child = cg_name_indexed(parent, "child", i);
-		if (!child)
-			return -1;
+		if (!child) {
+			ret = -1;
+			goto cleanup_children;
+		}
 
-		if (cg_create(child))
+		if (cg_create(child)) {
+			free(child);
 			goto cleanup_children;
+		}
 
 		free(child);
 	}
diff --git a/tools/testing/selftests/drivers/net/shaper.py b/tools/testing/selftests/drivers/net/shaper.py
index 11310f19bfa0..e39d270e688d 100755
--- a/tools/testing/selftests/drivers/net/shaper.py
+++ b/tools/testing/selftests/drivers/net/shaper.py
@@ -1,7 +1,10 @@
 #!/usr/bin/env python3
 # SPDX-License-Identifier: GPL-2.0
 
-from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_true, KsftSkipEx
+import errno
+
+from lib.py import ksft_run, ksft_exit
+from lib.py import ksft_eq, ksft_raises, ksft_true, KsftSkipEx
 from lib.py import EthtoolFamily, NetshaperFamily
 from lib.py import NetDrvEnv
 from lib.py import NlError
@@ -438,6 +441,21 @@ def queue_update(cfg, nl_shaper) -> None:
         nl_shaper.delete({'ifindex': cfg.ifindex,
                           'handle': {'scope': 'queue', 'id': i}})
 
+def dup_leaves(cfg, nl_shaper) -> None:
+    """ Ensure that the kernel rejects duplicate leaves. """
+    if not cfg.groups:
+        raise KsftSkipEx("device does not support node scope")
+
+    with ksft_raises(NlError) as cm:
+        nl_shaper.group({
+                   'ifindex': cfg.ifindex,
+                   'leaves':[{'handle': {'scope': 'queue', 'id': 0}},
+                             {'handle': {'scope': 'queue', 'id': 0}}],
+                   'handle': {'scope':'node'},
+                   'metric': 'bps',
+                   'bw-max': 10000})
+    ksft_eq(cm.exception.error, errno.EINVAL)
+
 def main() -> None:
     with NetDrvEnv(__file__, queue_count=4) as cfg:
         cfg.queues = False
@@ -453,7 +471,9 @@ def main() -> None:
                   basic_groups,
                   qgroups,
                   delegation,
-                  queue_update], args=(cfg, NetshaperFamily()))
+                  dup_leaves,
+                  queue_update],
+                 args=(cfg, NetshaperFamily()))
     ksft_exit()
 
 
diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c
index d6528c6f5e03..253e748c1d4a 100644
--- a/tools/testing/selftests/kvm/guest_memfd_test.c
+++ b/tools/testing/selftests/kvm/guest_memfd_test.c
@@ -510,7 +510,12 @@ static void test_guest_memfd_guest(void)
 		    "Default VM type should support INIT_SHARED, supported flags = 0x%x",
 		    vm_check_cap(vm, KVM_CAP_GUEST_MEMFD_FLAGS));
 
-	size = vm->page_size;
+	/*
+	 * Use the max of the host or guest page size for all operations, as
+	 * KVM requires guest_memfd files and memslots to be sized to multiples
+	 * of the host page size.
+	 */
+	size = max_t(size_t, vm->page_size, page_size);
 	fd = vm_create_guest_memfd(vm, size, GUEST_MEMFD_FLAG_MMAP |
 					     GUEST_MEMFD_FLAG_INIT_SHARED);
 	vm_set_user_memory_region2(vm, slot, KVM_MEM_GUEST_MEMFD, gpa, size, NULL, fd, 0);
@@ -519,7 +524,7 @@ static void test_guest_memfd_guest(void)
 	memset(mem, 0xaa, size);
 	kvm_munmap(mem, size);
 
-	virt_pg_map(vm, gpa, gpa);
+	virt_map(vm, gpa, gpa, size / vm->page_size);
 	vcpu_args_set(vcpu, 2, gpa, size);
 	vcpu_run(vcpu);
 
diff --git a/tools/testing/selftests/kvm/steal_time.c b/tools/testing/selftests/kvm/steal_time.c
index 7df2bc8eec02..76fcdd1fd3cb 100644
--- a/tools/testing/selftests/kvm/steal_time.c
+++ b/tools/testing/selftests/kvm/steal_time.c
@@ -220,6 +220,8 @@ static void check_steal_time_uapi(void)
 	};
 
 	vcpu_ioctl(vcpu, KVM_HAS_DEVICE_ATTR, &dev);
+	vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, ST_GPA_BASE, 1, 1, 0);
+	virt_map(vm, ST_GPA_BASE, ST_GPA_BASE, 1);
 
 	st_ipa = (ulong)ST_GPA_BASE | 1;
 	ret = __vcpu_ioctl(vcpu, KVM_SET_DEVICE_ATTR, &dev);
diff --git a/tools/testing/selftests/sched_ext/dequeue.c b/tools/testing/selftests/sched_ext/dequeue.c
index 4e93262703ca..383d06e972a4 100644
--- a/tools/testing/selftests/sched_ext/dequeue.c
+++ b/tools/testing/selftests/sched_ext/dequeue.c
@@ -33,6 +33,7 @@ static void worker_fn(int id)
 		/* Do some work to trigger scheduling events */
 		for (j = 0; j < 10000; j++)
 			sum += j;
+		asm volatile("" : : "r"(sum));
 
 		/* Sleep to trigger dequeue */
 		usleep(1000 + (id * 100));
diff --git a/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json b/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
index b1f856cf62c1..848696c373fc 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
@@ -1284,5 +1284,46 @@
         "teardown": [
             "$TC qdisc del dev $DUMMY handle 1: root"
         ]
+    },
+    {
+        "id": "3a62",
+        "name": "Try to create a qlen underflow with QFQ/CBS",
+        "category": [
+            "qdisc",
+            "qfq",
+            "cbs"
+        ],
+        "plugins": {
+            "requires": "nsPlugin"
+        },
+        "setup": [
+            "$IP link set dev $DUMMY up || true",
+            "$IP addr add 10.10.10.10/24 dev $DUMMY || true",
+            "$TC qdisc add dev $DUMMY root handle 1: qfq",
+            "$TC class add dev $DUMMY classid 1:1 parent 1: qfq",
+            "$TC class add dev $DUMMY classid 1:2 parent 1: qfq",
+            "$TC qdisc add dev $DUMMY handle 2: parent 1:1 cbs",
+            "$TC qdisc add dev $DUMMY handle 3: parent 2: netem delay 5000000000",
+            "$TC filter add dev $DUMMY parent 1: prio 1 u32 match ip dst 10.10.10.1 classid 1:1 action ok",
+            "$TC filter add dev $DUMMY parent 1: prio 2 u32 match ip dst 10.10.10.2 classid 1:2 action ok",
+            "ping -c 1 10.10.10.1 -W0.01 -I$DUMMY || true",
+            "$IP l set $DUMMY down",
+            "$IP l set $DUMMY up",
+            "$TC qdisc replace dev $DUMMY handle 4: parent 2: pfifo"
+        ],
+        "cmdUnderTest": "ping -c 1 10.10.10.2 -W0.01 -I$DUMMY",
+        "expExitCode": "1",
+        "verifyCmd": "$TC -s -j qdisc ls dev $DUMMY parent 1:1",
+        "matchJSON": [
+            {
+                "kind": "cbs",
+                "handle": "2:",
+                "bytes": 0,
+                "packets": 0
+            }
+        ],
+        "teardown": [
+            "$TC qdisc del dev $DUMMY handle 1: root"
+        ]
     }
 ]
diff --git a/tools/testing/selftests/ublk/kublk.c b/tools/testing/selftests/ublk/kublk.c
index fbd9b1e7342a..0b23c09daea5 100644
--- a/tools/testing/selftests/ublk/kublk.c
+++ b/tools/testing/selftests/ublk/kublk.c
@@ -1735,6 +1735,17 @@ static int __cmd_dev_add(const struct dev_ctx *ctx)
 		goto fail;
 	}
 
+	/*
+	 * The kernel may reduce nr_hw_queues (e.g. capped to nr_cpu_ids).
+	 * Cap nthreads to the actual queue count to avoid creating extra
+	 * handler threads that will hang during device removal.
+	 *
+	 * per_io_tasks mode is excluded: threads interleave across all
+	 * queues so nthreads > nr_hw_queues is valid and intentional.
+	 */
+	if (!ctx->per_io_tasks && dev->nthreads > info->nr_hw_queues)
+		dev->nthreads = info->nr_hw_queues;
+
 	ret = ublk_start_daemon(ctx, dev);
 	ublk_dbg(UBLK_DBG_DEV, "%s: daemon exit %d\n", __func__, ret);
 	if (ret < 0)