From 6b1ba40bb2ca4dc3797e0f30b9e8b3ee1acddd0f Mon Sep 17 00:00:00 2001 From: Sumit Garg Date: Wed, 5 May 2021 12:38:32 +0530 Subject: meta-rtmod1: Add sysfs polling lab material Signed-off-by: Sumit Garg --- meta-rtmod1/model_answer/files/rt-demo-kmod.c | 98 ++++++ meta-rtmod1/model_answer/files/rt-sysfs-poll.c | 52 ++++ .../recipes-training/rt-demoapps/files/COPYING | 340 +++++++++++++++++++++ .../recipes-training/rt-demoapps/files/Makefile | 14 + .../rt-demoapps/files/rt-demo-kmod.c | 85 ++++++ .../rt-demoapps/files/rt-sysfs-poll.c | 26 ++ .../rt-demoapps/rt-demo-kmod_1.0.bb | 17 ++ .../rt-demoapps/rt-demoapps_1.0.bb | 4 + 8 files changed, 636 insertions(+) create mode 100644 meta-rtmod1/model_answer/files/rt-demo-kmod.c create mode 100644 meta-rtmod1/model_answer/files/rt-sysfs-poll.c create mode 100644 meta-rtmod1/recipes-training/rt-demoapps/files/COPYING create mode 100644 meta-rtmod1/recipes-training/rt-demoapps/files/Makefile create mode 100644 meta-rtmod1/recipes-training/rt-demoapps/files/rt-demo-kmod.c create mode 100644 meta-rtmod1/recipes-training/rt-demoapps/files/rt-sysfs-poll.c create mode 100644 meta-rtmod1/recipes-training/rt-demoapps/rt-demo-kmod_1.0.bb diff --git a/meta-rtmod1/model_answer/files/rt-demo-kmod.c b/meta-rtmod1/model_answer/files/rt-demo-kmod.c new file mode 100644 index 0000000000..2342b9c35e --- /dev/null +++ b/meta-rtmod1/model_answer/files/rt-demo-kmod.c @@ -0,0 +1,98 @@ +#include +#include +#include +#include +#include + +struct demo_attr { + struct attribute attr; + int value; +}; + +static struct demo_attr notify = { + .attr.name="notify", + .attr.mode = 0644, + .value = 0, +}; + +static struct demo_attr trigger = { + .attr.name="trigger", + .attr.mode = 0644, + .value = 0, +}; + +static struct attribute *demoattr[] = { + ¬ify.attr, + &trigger.attr, + NULL +}; + +static struct kobject *demo_kobj; + +static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) +{ + struct demo_attr *a = container_of(attr, struct demo_attr, attr); + + pr_debug("RT demo kmod: show called (%s)\n", a->attr.name); + + return scnprintf(buf, PAGE_SIZE, "%s: %d\n", a->attr.name, a->value); +} + +static ssize_t store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t len) +{ + struct demo_attr *a = container_of(attr, struct demo_attr, attr); + + if (!strncmp(a->attr.name, "notify", sizeof("notify"))) + return len; + + sscanf(buf, "%d", &a->value); + notify.value = a->value; + pr_debug("RT demo kmod: sysfs_notify store %s = %d\n", a->attr.name, + a->value); + sysfs_notify(demo_kobj, NULL, "notify"); + + return len; +} + +static struct sysfs_ops demoops = { + .show = show, + .store = store, +}; + +static struct kobj_type mytype = { + .sysfs_ops = &demoops, + .default_attrs = demoattr, +}; + +static int __init demo_module_init(void) +{ + int err = -1; + + pr_debug("RT demo kmod: init\n"); + demo_kobj = kzalloc(sizeof(*demo_kobj), GFP_KERNEL); + if (demo_kobj) { + kobject_init(demo_kobj, &mytype); + if (kobject_add(demo_kobj, NULL, "%s", "demo-poll")) { + err = -1; + pr_err("RT demo kmod: kobject_add() failed\n"); + kobject_put(demo_kobj); + demo_kobj = NULL; + } + err = 0; + } + return err; +} + +static void __exit demo_module_exit(void) +{ + if (demo_kobj) { + kobject_put(demo_kobj); + kfree(demo_kobj); + } + pr_debug("RT demo kmod: exit\n"); +} + +module_init(demo_module_init); +module_exit(demo_module_exit); +MODULE_LICENSE("GPL"); diff --git a/meta-rtmod1/model_answer/files/rt-sysfs-poll.c b/meta-rtmod1/model_answer/files/rt-sysfs-poll.c new file mode 100644 index 0000000000..8d0a5314e9 --- /dev/null +++ b/meta-rtmod1/model_answer/files/rt-sysfs-poll.c @@ -0,0 +1,52 @@ +/* Copyright (C) 2021 by Linaro */ +/* Permission to use, copy, modify, and/or distribute this software for any */ +/* purpose with or without fee is hereby granted. */ +/* THE SOFTWARE IS PROVIDED AS IS AND THE AUTHOR DISCLAIMS ALL WARRANTIES */ +/* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF */ +/* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR */ +/* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */ +/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN */ +/* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF */ +/* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define TEST_SYSFS_NOTIFY "/sys/demo-poll/notify" + +int main(void) +{ + int notify_fd, rv, cnt; + char attr_data[100]; + struct pollfd ufds; + + if ((notify_fd = open(TEST_SYSFS_NOTIFY, O_RDWR)) < 0) { + printf("Unable to open %s", TEST_SYSFS_NOTIFY); + exit(1); + } + + cnt = read(notify_fd, attr_data, 100); + lseek(notify_fd, 0, SEEK_SET); + ufds.fd = notify_fd; + ufds.events = POLLPRI | POLLERR; + ufds.revents = 0; + + if ((rv = poll(&ufds, 1, 100000)) < 0) { + perror("poll error"); + } else if (rv == 0) { + printf("Timeout occurred!\n"); + } else if (ufds.revents & (POLLPRI | POLLERR)) { + cnt = read(notify_fd, attr_data, 100); + printf("sysfs_notify() triggered, revents: %08X," + " attribute data[%d] %s", ufds.revents, cnt, attr_data); + } + + close(notify_fd); +} diff --git a/meta-rtmod1/recipes-training/rt-demoapps/files/COPYING b/meta-rtmod1/recipes-training/rt-demoapps/files/COPYING new file mode 100644 index 0000000000..6d45519c8c --- /dev/null +++ b/meta-rtmod1/recipes-training/rt-demoapps/files/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/meta-rtmod1/recipes-training/rt-demoapps/files/Makefile b/meta-rtmod1/recipes-training/rt-demoapps/files/Makefile new file mode 100644 index 0000000000..9bedbc6a0b --- /dev/null +++ b/meta-rtmod1/recipes-training/rt-demoapps/files/Makefile @@ -0,0 +1,14 @@ +obj-m := rt-demo-kmod.o + +SRC := $(shell pwd) + +all: + $(MAKE) -C $(KERNEL_SRC) M=$(SRC) + +modules_install: + $(MAKE) -C $(KERNEL_SRC) M=$(SRC) modules_install + +clean: + rm -f *.o *~ core .depend .*.cmd *.ko *.mod.c + rm -f Module.markers Module.symvers modules.order + rm -rf .tmp_versions Modules.symvers diff --git a/meta-rtmod1/recipes-training/rt-demoapps/files/rt-demo-kmod.c b/meta-rtmod1/recipes-training/rt-demoapps/files/rt-demo-kmod.c new file mode 100644 index 0000000000..38cb93bb0c --- /dev/null +++ b/meta-rtmod1/recipes-training/rt-demoapps/files/rt-demo-kmod.c @@ -0,0 +1,85 @@ +#include +#include +#include +#include +#include + +struct demo_attr { + struct attribute attr; + int value; +}; + +static struct demo_attr notify = { + .attr.name="notify", + .attr.mode = 0644, + .value = 0, +}; + +static struct demo_attr trigger = { + .attr.name="trigger", + .attr.mode = 0644, + .value = 0, +}; + +static struct attribute *demoattr[] = { + ¬ify.attr, + &trigger.attr, + NULL +}; + +static struct kobject *demo_kobj; + +static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "TODO: Implement sysfs show()\n"); +} + +static ssize_t store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t len) +{ + pr_info("TODO: Implement sysfs store()\n"); + + return len; +} + +static struct sysfs_ops demoops = { + .show = show, + .store = store, +}; + +static struct kobj_type mytype = { + .sysfs_ops = &demoops, + .default_attrs = demoattr, +}; + +static int __init demo_module_init(void) +{ + int err = -1; + + pr_debug("RT demo kmod: init\n"); + demo_kobj = kzalloc(sizeof(*demo_kobj), GFP_KERNEL); + if (demo_kobj) { + kobject_init(demo_kobj, &mytype); + if (kobject_add(demo_kobj, NULL, "%s", "demo-poll")) { + err = -1; + pr_err("RT demo kmod: kobject_add() failed\n"); + kobject_put(demo_kobj); + demo_kobj = NULL; + } + err = 0; + } + return err; +} + +static void __exit demo_module_exit(void) +{ + if (demo_kobj) { + kobject_put(demo_kobj); + kfree(demo_kobj); + } + pr_debug("RT demo kmod: exit\n"); +} + +module_init(demo_module_init); +module_exit(demo_module_exit); +MODULE_LICENSE("GPL"); diff --git a/meta-rtmod1/recipes-training/rt-demoapps/files/rt-sysfs-poll.c b/meta-rtmod1/recipes-training/rt-demoapps/files/rt-sysfs-poll.c new file mode 100644 index 0000000000..0480072d22 --- /dev/null +++ b/meta-rtmod1/recipes-training/rt-demoapps/files/rt-sysfs-poll.c @@ -0,0 +1,26 @@ +/* Copyright (C) 2021 by Linaro */ +/* Permission to use, copy, modify, and/or distribute this software for any */ +/* purpose with or without fee is hereby granted. */ +/* THE SOFTWARE IS PROVIDED AS IS AND THE AUTHOR DISCLAIMS ALL WARRANTIES */ +/* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF */ +/* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR */ +/* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */ +/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN */ +/* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF */ +/* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +int main(void) +{ + printf("TODO: Write an apllication to do sysfs poll!\n"); + return 0; +} diff --git a/meta-rtmod1/recipes-training/rt-demoapps/rt-demo-kmod_1.0.bb b/meta-rtmod1/recipes-training/rt-demoapps/rt-demo-kmod_1.0.bb new file mode 100644 index 0000000000..19a0839f12 --- /dev/null +++ b/meta-rtmod1/recipes-training/rt-demoapps/rt-demo-kmod_1.0.bb @@ -0,0 +1,17 @@ +SUMMARY = "RT sysfs notify example Linux kernel module" +LICENSE = "GPLv2" +LIC_FILES_CHKSUM = "file://COPYING;md5=12f884d2ae1ff87c09e5b7ccc2c4ca7e" + +inherit module + +SRC_URI = "file://Makefile \ + file://rt-demo-kmod.c \ + file://COPYING \ + " + +S = "${WORKDIR}" + +# The inherit of module.bbclass will automatically name module packages with +# "kernel-module-" prefix as required by the oe-core build environment. + +RPROVIDES_${PN} += "kernel-module-demo" diff --git a/meta-rtmod1/recipes-training/rt-demoapps/rt-demoapps_1.0.bb b/meta-rtmod1/recipes-training/rt-demoapps/rt-demoapps_1.0.bb index 3f06c7a299..9d8ca3fcbb 100644 --- a/meta-rtmod1/recipes-training/rt-demoapps/rt-demoapps_1.0.bb +++ b/meta-rtmod1/recipes-training/rt-demoapps/rt-demoapps_1.0.bb @@ -7,6 +7,7 @@ SRC_URI = "file://rt-thread.c \ file://rt-demotest.c \ file://rt-demotest-mlockall.c \ file://rtapps-systemd.service \ + file://rt-sysfs-poll.c \ " S = "${WORKDIR}" @@ -21,6 +22,7 @@ do_compile() { ${CC} rt-thread.c ${CFLAGS} -o rt-thread ${LDFLAGS} -lpthread ${CC} rt-demotest.c ${CFLAGS} -o rt-demotest ${LDFLAGS} -lpthread ${CC} rt-demotest-mlockall.c ${CFLAGS} -o rt-demotest-mlockall ${LDFLAGS} -lpthread + ${CC} rt-sysfs-poll.c ${CFLAGS} -o rt-sysfs-poll ${LDFLAGS} } do_install() { @@ -28,6 +30,7 @@ do_install() { install -m 0755 rt-thread ${D}${bindir} install -m 0755 rt-demotest ${D}${bindir} install -m 0755 rt-demotest-mlockall ${D}${bindir} + install -m 0755 rt-sysfs-poll ${D}${bindir} if ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}; then install -d ${D}${systemd_unitdir}/system @@ -41,4 +44,5 @@ SYSTEMD_SERVICE_${PN} += "${@bb.utils.contains('PACKAGECONFIG', 'systemd', 'rtap FILES_{PN} += "${bindir}/rt-thread \ ${bindir}/rt-demotest \ ${bindir}/rt-demotest-mlockall \ + ${bindir}/rt-sysfs-poll \ " -- cgit v1.2.3