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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | // 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) { const 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) { const 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); |