Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

4 files changed, 375 insertions, 0 deletions

diff --git a/tools/testing/selftests/sched/.gitignore b/tools/testing/selftests/sched/.gitignore
new file mode 100644
index 000000000..6996d4654
--- /dev/null
+++ b/tools/testing/selftests/sched/.gitignore
@@ -0,0 +1 @@
+cs_prctl_test
diff --git a/tools/testing/selftests/sched/Makefile b/tools/testing/selftests/sched/Makefile
new file mode 100644
index 000000000..099ee9213
--- /dev/null
+++ b/tools/testing/selftests/sched/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
+CLANG_FLAGS += -no-integrated-as
+endif
+
+CFLAGS += -O2 -Wall -g -I./ $(KHDR_INCLUDES) -Wl,-rpath=./ \
+	  $(CLANG_FLAGS)
+LDLIBS += -lpthread
+
+TEST_GEN_FILES := cs_prctl_test
+TEST_PROGS := cs_prctl_test
+
+include ../lib.mk
diff --git a/tools/testing/selftests/sched/config b/tools/testing/selftests/sched/config
new file mode 100644
index 000000000..1bb8bf6d7
--- /dev/null
+++ b/tools/testing/selftests/sched/config
@@ -0,0 +1 @@
+# empty
diff --git a/tools/testing/selftests/sched/cs_prctl_test.c b/tools/testing/selftests/sched/cs_prctl_test.c
new file mode 100644
index 000000000..52d97fae4
--- /dev/null
+++ b/tools/testing/selftests/sched/cs_prctl_test.c
@@ -0,0 +1,359 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Use the core scheduling prctl() to test core scheduling cookies control.
+ *
+ * Copyright (c) 2021 Oracle and/or its affiliates.
+ * Author: Chris Hyser <chris.hyser@oracle.com>
+ *
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, see <http://www.gnu.org/licenses>.
+ */
+
+#define _GNU_SOURCE
+#include <sys/eventfd.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <sched.h>
+#include <sys/prctl.h>
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if __GLIBC_PREREQ(2, 30) == 0
+#include <sys/syscall.h>
+static pid_t gettid(void)
+{
+	return syscall(SYS_gettid);
+}
+#endif
+
+#ifndef PR_SCHED_CORE
+#define PR_SCHED_CORE			62
+#define PR_SCHED_CORE_GET		0
+#define PR_SCHED_CORE_CREATE		1 /* create unique core_sched cookie */
+#define PR_SCHED_CORE_SHARE_TO		2 /* push core_sched cookie to pid */
+#define PR_SCHED_CORE_SHARE_FROM	3 /* pull core_sched cookie to pid */
+#define PR_SCHED_CORE_MAX		4
+#endif
+
+#define MAX_PROCESSES 128
+#define MAX_THREADS   128
+
+static const char USAGE[] = "cs_prctl_test [options]\n"
+"    options:\n"
+"	-P  : number of processes to create.\n"
+"	-T  : number of threads per process to create.\n"
+"	-d  : delay time to keep tasks alive.\n"
+"	-k  : keep tasks alive until keypress.\n";
+
+enum pid_type {PIDTYPE_PID = 0, PIDTYPE_TGID, PIDTYPE_PGID};
+
+const int THREAD_CLONE_FLAGS = CLONE_THREAD | CLONE_SIGHAND | CLONE_FS | CLONE_VM | CLONE_FILES;
+
+struct child_args {
+	int num_threads;
+	int pfd[2];
+	int cpid;
+	int thr_tids[MAX_THREADS];
+};
+
+static struct child_args procs[MAX_PROCESSES];
+static int num_processes = 2;
+static int need_cleanup;
+
+static int _prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4,
+		  unsigned long arg5)
+{
+	int res;
+
+	res = prctl(option, arg2, arg3, arg4, arg5);
+	printf("%d = prctl(%d, %ld, %ld, %ld, %lx)\n", res, option, (long)arg2, (long)arg3,
+	       (long)arg4, arg5);
+	return res;
+}
+
+#define STACK_SIZE (1024 * 1024)
+
+#define handle_error(msg) __handle_error(__FILE__, __LINE__, msg)
+static void __handle_error(char *fn, int ln, char *msg)
+{
+	int pidx;
+	printf("(%s:%d) - ", fn, ln);
+	perror(msg);
+	if (need_cleanup) {
+		for (pidx = 0; pidx < num_processes; ++pidx)
+			kill(procs[pidx].cpid, 15);
+		need_cleanup = 0;
+	}
+	exit(EXIT_FAILURE);
+}
+
+static void handle_usage(int rc, char *msg)
+{
+	puts(USAGE);
+	puts(msg);
+	putchar('\n');
+	exit(rc);
+}
+
+static unsigned long get_cs_cookie(int pid)
+{
+	unsigned long long cookie;
+	int ret;
+
+	ret = prctl(PR_SCHED_CORE, PR_SCHED_CORE_GET, pid, PIDTYPE_PID,
+		    (unsigned long)&cookie);
+	if (ret) {
+		printf("Not a core sched system\n");
+		return -1UL;
+	}
+
+	return cookie;
+}
+
+static int child_func_thread(void __attribute__((unused))*arg)
+{
+	while (1)
+		usleep(20000);
+	return 0;
+}
+
+static void create_threads(int num_threads, int thr_tids[])
+{
+	void *child_stack;
+	pid_t tid;
+	int i;
+
+	for (i = 0; i < num_threads; ++i) {
+		child_stack = malloc(STACK_SIZE);
+		if (!child_stack)
+			handle_error("child stack allocate");
+
+		tid = clone(child_func_thread, child_stack + STACK_SIZE, THREAD_CLONE_FLAGS, NULL);
+		if (tid == -1)
+			handle_error("clone thread");
+		thr_tids[i] = tid;
+	}
+}
+
+static int child_func_process(void *arg)
+{
+	struct child_args *ca = (struct child_args *)arg;
+	int ret;
+
+	close(ca->pfd[0]);
+
+	create_threads(ca->num_threads, ca->thr_tids);
+
+	ret = write(ca->pfd[1], &ca->thr_tids, sizeof(int) * ca->num_threads);
+	if (ret == -1)
+		printf("write failed on pfd[%d] - error (%s)\n",
+			ca->pfd[1], strerror(errno));
+
+	close(ca->pfd[1]);
+
+	while (1)
+		usleep(20000);
+	return 0;
+}
+
+static unsigned char child_func_process_stack[STACK_SIZE];
+
+void create_processes(int num_processes, int num_threads, struct child_args proc[])
+{
+	pid_t cpid;
+	int i, ret;
+
+	for (i = 0; i < num_processes; ++i) {
+		proc[i].num_threads = num_threads;
+
+		if (pipe(proc[i].pfd) == -1)
+			handle_error("pipe() failed");
+
+		cpid = clone(child_func_process, child_func_process_stack + STACK_SIZE,
+			     SIGCHLD, &proc[i]);
+		proc[i].cpid = cpid;
+		close(proc[i].pfd[1]);
+	}
+
+	for (i = 0; i < num_processes; ++i) {
+		ret = read(proc[i].pfd[0], &proc[i].thr_tids, sizeof(int) * proc[i].num_threads);
+		if (ret == -1)
+			printf("read failed on proc[%d].pfd[0] error (%s)\n",
+				i, strerror(errno));
+		close(proc[i].pfd[0]);
+	}
+}
+
+void disp_processes(int num_processes, struct child_args proc[])
+{
+	int i, j;
+
+	printf("tid=%d, / tgid=%d / pgid=%d: %lx\n", gettid(), getpid(), getpgid(0),
+	       get_cs_cookie(getpid()));
+
+	for (i = 0; i < num_processes; ++i) {
+		printf("    tid=%d, / tgid=%d / pgid=%d: %lx\n", proc[i].cpid, proc[i].cpid,
+		       getpgid(proc[i].cpid), get_cs_cookie(proc[i].cpid));
+		for (j = 0; j < proc[i].num_threads; ++j) {
+			printf("        tid=%d, / tgid=%d / pgid=%d: %lx\n", proc[i].thr_tids[j],
+			       proc[i].cpid, getpgid(0), get_cs_cookie(proc[i].thr_tids[j]));
+		}
+	}
+	puts("\n");
+}
+
+static int errors;
+
+#define validate(v) _validate(__LINE__, v, #v)
+void _validate(int line, int val, char *msg)
+{
+	if (!val) {
+		++errors;
+		printf("(%d) FAILED: %s\n", line, msg);
+	} else {
+		printf("(%d) PASSED: %s\n", line, msg);
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	int keypress = 0;
+	int num_threads = 3;
+	int delay = 0;
+	int res = 0;
+	int pidx;
+	int pid;
+	int opt;
+
+	while ((opt = getopt(argc, argv, ":hkT:P:d:")) != -1) {
+		switch (opt) {
+		case 'P':
+			num_processes = (int)strtol(optarg, NULL, 10);
+			break;
+		case 'T':
+			num_threads = (int)strtoul(optarg, NULL, 10);
+			break;
+		case 'd':
+			delay = (int)strtol(optarg, NULL, 10);
+			break;
+		case 'k':
+			keypress = 1;
+			break;
+		case 'h':
+			printf(USAGE);
+			exit(EXIT_SUCCESS);
+		default:
+			handle_usage(20, "unknown option");
+		}
+	}
+
+	if (num_processes < 1 || num_processes > MAX_PROCESSES)
+		handle_usage(1, "Bad processes value");
+
+	if (num_threads < 1 || num_threads > MAX_THREADS)
+		handle_usage(2, "Bad thread value");
+
+	if (keypress)
+		delay = -1;
+
+	srand(time(NULL));
+
+	/* put into separate process group */
+	if (setpgid(0, 0) != 0)
+		handle_error("process group");
+
+	printf("\n## Create a thread/process/process group hierarchy\n");
+	create_processes(num_processes, num_threads, procs);
+	need_cleanup = 1;
+	disp_processes(num_processes, procs);
+	validate(get_cs_cookie(0) == 0);
+
+	printf("\n## Set a cookie on entire process group\n");
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, 0, PIDTYPE_PGID, 0) < 0)
+		handle_error("core_sched create failed -- PGID");
+	disp_processes(num_processes, procs);
+
+	validate(get_cs_cookie(0) != 0);
+
+	/* get a random process pid */
+	pidx = rand() % num_processes;
+	pid = procs[pidx].cpid;
+
+	validate(get_cs_cookie(0) == get_cs_cookie(pid));
+	validate(get_cs_cookie(0) == get_cs_cookie(procs[pidx].thr_tids[0]));
+
+	printf("\n## Set a new cookie on entire process/TGID [%d]\n", pid);
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_CREATE, pid, PIDTYPE_TGID, 0) < 0)
+		handle_error("core_sched create failed -- TGID");
+	disp_processes(num_processes, procs);
+
+	validate(get_cs_cookie(0) != get_cs_cookie(pid));
+	validate(get_cs_cookie(pid) != 0);
+	validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[0]));
+
+	printf("\n## Copy the cookie of current/PGID[%d], to pid [%d] as PIDTYPE_PID\n",
+	       getpid(), pid);
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, pid, PIDTYPE_PID, 0) < 0)
+		handle_error("core_sched share to itself failed -- PID");
+	disp_processes(num_processes, procs);
+
+	validate(get_cs_cookie(0) == get_cs_cookie(pid));
+	validate(get_cs_cookie(pid) != 0);
+	validate(get_cs_cookie(pid) != get_cs_cookie(procs[pidx].thr_tids[0]));
+
+	printf("\n## Copy cookie from a thread [%d] to current/PGID [%d] as PIDTYPE_PID\n",
+	       procs[pidx].thr_tids[0], getpid());
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_FROM, procs[pidx].thr_tids[0],
+		   PIDTYPE_PID, 0) < 0)
+		handle_error("core_sched share from thread failed -- PID");
+	disp_processes(num_processes, procs);
+
+	validate(get_cs_cookie(0) == get_cs_cookie(procs[pidx].thr_tids[0]));
+	validate(get_cs_cookie(pid) != get_cs_cookie(procs[pidx].thr_tids[0]));
+
+	printf("\n## Copy cookie from current [%d] to current as pidtype PGID\n", getpid());
+	if (_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, 0, PIDTYPE_PGID, 0) < 0)
+		handle_error("core_sched share to self failed -- PGID");
+	disp_processes(num_processes, procs);
+
+	validate(get_cs_cookie(0) == get_cs_cookie(pid));
+	validate(get_cs_cookie(pid) != 0);
+	validate(get_cs_cookie(pid) == get_cs_cookie(procs[pidx].thr_tids[0]));
+
+	validate(_prctl(PR_SCHED_CORE, PR_SCHED_CORE_MAX, 0, PIDTYPE_PGID, 0) < 0
+		&& errno == EINVAL);
+
+	validate(_prctl(PR_SCHED_CORE, PR_SCHED_CORE_SHARE_TO, 0, PIDTYPE_PGID, 1) < 0
+		&& errno == EINVAL);
+
+	if (errors) {
+		printf("TESTS FAILED. errors: %d\n", errors);
+		res = 10;
+	} else {
+		printf("SUCCESS !!!\n");
+	}
+
+	if (keypress)
+		getchar();
+	else
+		sleep(delay);
+
+	for (pidx = 0; pidx < num_processes; ++pidx)
+		kill(procs[pidx].cpid, 15);
+
+	return res;
+}