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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/dma/idxd/compat.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/dma/idxd/compat.c')
-rw-r--r-- | drivers/dma/idxd/compat.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/dma/idxd/compat.c b/drivers/dma/idxd/compat.c new file mode 100644 index 000000000..3df21615f --- /dev/null +++ b/drivers/dma/idxd/compat.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright(c) 2021 Intel Corporation. All rights rsvd. */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/device/bus.h> +#include "idxd.h" + +extern int device_driver_attach(struct device_driver *drv, struct device *dev); +extern void device_driver_detach(struct device *dev); + +#define DRIVER_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \ + struct driver_attribute driver_attr_##_name = \ + __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) + +static ssize_t unbind_store(struct device_driver *drv, const char *buf, size_t count) +{ + struct bus_type *bus = drv->bus; + struct device *dev; + int rc = -ENODEV; + + dev = bus_find_device_by_name(bus, NULL, buf); + if (dev && dev->driver) { + device_driver_detach(dev); + rc = count; + } + + return rc; +} +static DRIVER_ATTR_IGNORE_LOCKDEP(unbind, 0200, NULL, unbind_store); + +static ssize_t bind_store(struct device_driver *drv, const char *buf, size_t count) +{ + struct bus_type *bus = drv->bus; + struct device *dev; + struct device_driver *alt_drv = NULL; + int rc = -ENODEV; + struct idxd_dev *idxd_dev; + + dev = bus_find_device_by_name(bus, NULL, buf); + if (!dev || dev->driver || drv != &dsa_drv.drv) + return -ENODEV; + + idxd_dev = confdev_to_idxd_dev(dev); + if (is_idxd_dev(idxd_dev)) { + alt_drv = driver_find("idxd", bus); + } else if (is_idxd_wq_dev(idxd_dev)) { + struct idxd_wq *wq = confdev_to_wq(dev); + + if (is_idxd_wq_kernel(wq)) + alt_drv = driver_find("dmaengine", bus); + else if (is_idxd_wq_user(wq)) + alt_drv = driver_find("user", bus); + } + if (!alt_drv) + return -ENODEV; + + rc = device_driver_attach(alt_drv, dev); + if (rc < 0) + return rc; + + return count; +} +static DRIVER_ATTR_IGNORE_LOCKDEP(bind, 0200, NULL, bind_store); + +static struct attribute *dsa_drv_compat_attrs[] = { + &driver_attr_bind.attr, + &driver_attr_unbind.attr, + NULL, +}; + +static const struct attribute_group dsa_drv_compat_attr_group = { + .attrs = dsa_drv_compat_attrs, +}; + +static const struct attribute_group *dsa_drv_compat_groups[] = { + &dsa_drv_compat_attr_group, + NULL, +}; + +static int idxd_dsa_drv_probe(struct idxd_dev *idxd_dev) +{ + return -ENODEV; +} + +static void idxd_dsa_drv_remove(struct idxd_dev *idxd_dev) +{ +} + +static enum idxd_dev_type dev_types[] = { + IDXD_DEV_NONE, +}; + +struct idxd_device_driver dsa_drv = { + .name = "dsa", + .probe = idxd_dsa_drv_probe, + .remove = idxd_dsa_drv_remove, + .type = dev_types, + .drv = { + .suppress_bind_attrs = true, + .groups = dsa_drv_compat_groups, + }, +}; + +module_idxd_driver(dsa_drv); +MODULE_IMPORT_NS(IDXD); |