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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/sparc/kernel/vio.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/sparc/kernel/vio.c')
-rw-r--r-- | arch/sparc/kernel/vio.c | 573 |
1 files changed, 573 insertions, 0 deletions
diff --git a/arch/sparc/kernel/vio.c b/arch/sparc/kernel/vio.c new file mode 100644 index 0000000000..b78df3a15a --- /dev/null +++ b/arch/sparc/kernel/vio.c @@ -0,0 +1,573 @@ +// SPDX-License-Identifier: GPL-2.0 +/* vio.c: Virtual I/O channel devices probing infrastructure. + * + * Copyright (c) 2003-2005 IBM Corp. + * Dave Engebretsen engebret@us.ibm.com + * Santiago Leon santil@us.ibm.com + * Hollis Blanchard <hollisb@us.ibm.com> + * Stephen Rothwell + * + * Adapted to sparc64 by David S. Miller davem@davemloft.net + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/irq.h> +#include <linux/export.h> +#include <linux/init.h> + +#include <asm/mdesc.h> +#include <asm/vio.h> + +static const struct vio_device_id *vio_match_device( + const struct vio_device_id *matches, + const struct vio_dev *dev) +{ + const char *type, *compat; + int len; + + type = dev->type; + compat = dev->compat; + len = dev->compat_len; + + while (matches->type[0] || matches->compat[0]) { + int match = 1; + if (matches->type[0]) + match &= !strcmp(matches->type, type); + + if (matches->compat[0]) { + match &= len && + of_find_in_proplist(compat, matches->compat, len); + } + if (match) + return matches; + matches++; + } + return NULL; +} + +static int vio_hotplug(const struct device *dev, struct kobj_uevent_env *env) +{ + const struct vio_dev *vio_dev = to_vio_dev(dev); + + add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat); + return 0; +} + +static int vio_bus_match(struct device *dev, struct device_driver *drv) +{ + struct vio_dev *vio_dev = to_vio_dev(dev); + struct vio_driver *vio_drv = to_vio_driver(drv); + const struct vio_device_id *matches = vio_drv->id_table; + + if (!matches) + return 0; + + return vio_match_device(matches, vio_dev) != NULL; +} + +static int vio_device_probe(struct device *dev) +{ + struct vio_dev *vdev = to_vio_dev(dev); + struct vio_driver *drv = to_vio_driver(dev->driver); + const struct vio_device_id *id; + + if (!drv->probe) + return -ENODEV; + + id = vio_match_device(drv->id_table, vdev); + if (!id) + return -ENODEV; + + /* alloc irqs (unless the driver specified not to) */ + if (!drv->no_irq) { + if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL) + vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle, + vdev->tx_ino); + + if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL) + vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle, + vdev->rx_ino); + } + + return drv->probe(vdev, id); +} + +static void vio_device_remove(struct device *dev) +{ + struct vio_dev *vdev = to_vio_dev(dev); + struct vio_driver *drv = to_vio_driver(dev->driver); + + if (drv->remove) { + /* + * Ideally, we would remove/deallocate tx/rx virqs + * here - however, there are currently no support + * routines to do so at the moment. TBD + */ + + drv->remove(vdev); + } +} + +static ssize_t devspec_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct vio_dev *vdev = to_vio_dev(dev); + const char *str = "none"; + + if (!strcmp(vdev->type, "vnet-port")) + str = "vnet"; + else if (!strcmp(vdev->type, "vdc-port")) + str = "vdisk"; + + return sprintf(buf, "%s\n", str); +} +static DEVICE_ATTR_RO(devspec); + +static ssize_t type_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct vio_dev *vdev = to_vio_dev(dev); + return sprintf(buf, "%s\n", vdev->type); +} +static DEVICE_ATTR_RO(type); + +static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + const struct vio_dev *vdev = to_vio_dev(dev); + + return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat); +} +static DEVICE_ATTR_RO(modalias); + +static struct attribute *vio_dev_attrs[] = { + &dev_attr_devspec.attr, + &dev_attr_type.attr, + &dev_attr_modalias.attr, + NULL, + }; +ATTRIBUTE_GROUPS(vio_dev); + +static struct bus_type vio_bus_type = { + .name = "vio", + .dev_groups = vio_dev_groups, + .uevent = vio_hotplug, + .match = vio_bus_match, + .probe = vio_device_probe, + .remove = vio_device_remove, +}; + +int __vio_register_driver(struct vio_driver *viodrv, struct module *owner, + const char *mod_name) +{ + viodrv->driver.bus = &vio_bus_type; + viodrv->driver.name = viodrv->name; + viodrv->driver.owner = owner; + viodrv->driver.mod_name = mod_name; + + return driver_register(&viodrv->driver); +} +EXPORT_SYMBOL(__vio_register_driver); + +void vio_unregister_driver(struct vio_driver *viodrv) +{ + driver_unregister(&viodrv->driver); +} +EXPORT_SYMBOL(vio_unregister_driver); + +static void vio_dev_release(struct device *dev) +{ + kfree(to_vio_dev(dev)); +} + +static ssize_t +show_pciobppath_attr(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct vio_dev *vdev; + struct device_node *dp; + + vdev = to_vio_dev(dev); + dp = vdev->dp; + + return scnprintf(buf, PAGE_SIZE, "%pOF\n", dp); +} + +static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, + show_pciobppath_attr, NULL); + +static struct device_node *cdev_node; + +static struct vio_dev *root_vdev; +static u64 cdev_cfg_handle; + +static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node) +{ + const u64 *cfg_handle = NULL; + u64 a; + + mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { + u64 target; + + target = mdesc_arc_target(hp, a); + cfg_handle = mdesc_get_property(hp, target, + "cfg-handle", NULL); + if (cfg_handle) + break; + } + + return cfg_handle; +} + +/** + * vio_vdev_node() - Find VDEV node in MD + * @hp: Handle to the MD + * @vdev: Pointer to VDEV + * + * Find the node in the current MD which matches the given vio_dev. This + * must be done dynamically since the node value can change if the MD + * is updated. + * + * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine + * + * Return: The VDEV node in MDESC + */ +u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev) +{ + u64 node; + + if (vdev == NULL) + return MDESC_NODE_NULL; + + node = mdesc_get_node(hp, (const char *)vdev->node_name, + &vdev->md_node_info); + + return node; +} +EXPORT_SYMBOL(vio_vdev_node); + +static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, + struct vio_dev *vdev) +{ + u64 a; + + vdev->tx_ino = ~0UL; + vdev->rx_ino = ~0UL; + vdev->channel_id = ~0UL; + mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { + const u64 *chan_id; + const u64 *irq; + u64 target; + + target = mdesc_arc_target(hp, a); + + irq = mdesc_get_property(hp, target, "tx-ino", NULL); + if (irq) + vdev->tx_ino = *irq; + + irq = mdesc_get_property(hp, target, "rx-ino", NULL); + if (irq) + vdev->rx_ino = *irq; + + chan_id = mdesc_get_property(hp, target, "id", NULL); + if (chan_id) + vdev->channel_id = *chan_id; + } + + vdev->cdev_handle = cdev_cfg_handle; +} + +int vio_set_intr(unsigned long dev_ino, int state) +{ + int err; + + err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state); + return err; +} +EXPORT_SYMBOL(vio_set_intr); + +static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, + const char *node_name, + struct device *parent) +{ + const char *type, *compat; + struct device_node *dp; + struct vio_dev *vdev; + int err, tlen, clen; + const u64 *id, *cfg_handle; + + type = mdesc_get_property(hp, mp, "device-type", &tlen); + if (!type) { + type = mdesc_get_property(hp, mp, "name", &tlen); + if (!type) { + type = mdesc_node_name(hp, mp); + tlen = strlen(type) + 1; + } + } + if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) { + printk(KERN_ERR "VIO: Type string [%s] is too long.\n", + type); + return NULL; + } + + id = mdesc_get_property(hp, mp, "id", NULL); + + cfg_handle = vio_cfg_handle(hp, mp); + + compat = mdesc_get_property(hp, mp, "device-type", &clen); + if (!compat) { + clen = 0; + } else if (clen > VIO_MAX_COMPAT_LEN) { + printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", + clen, type); + return NULL; + } + + vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); + if (!vdev) { + printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); + return NULL; + } + + vdev->mp = mp; + memcpy(vdev->type, type, tlen); + if (compat) + memcpy(vdev->compat, compat, clen); + else + memset(vdev->compat, 0, sizeof(vdev->compat)); + vdev->compat_len = clen; + + vdev->port_id = ~0UL; + vdev->tx_irq = 0; + vdev->rx_irq = 0; + + vio_fill_channel_info(hp, mp, vdev); + + if (!id) { + dev_set_name(&vdev->dev, "%s", type); + vdev->dev_no = ~(u64)0; + } else if (!cfg_handle) { + dev_set_name(&vdev->dev, "%s-%llu", type, *id); + vdev->dev_no = *id; + } else { + dev_set_name(&vdev->dev, "%s-%llu-%llu", type, + *cfg_handle, *id); + vdev->dev_no = *cfg_handle; + vdev->port_id = *id; + } + + vdev->dev.parent = parent; + vdev->dev.bus = &vio_bus_type; + vdev->dev.release = vio_dev_release; + + if (parent == NULL) { + dp = cdev_node; + } else if (to_vio_dev(parent) == root_vdev) { + for_each_child_of_node(cdev_node, dp) { + if (of_node_is_type(dp, type)) + break; + } + } else { + dp = to_vio_dev(parent)->dp; + } + vdev->dp = dp; + + /* + * node_name is NULL for the parent/channel-devices node and + * the parent doesn't require the MD node info. + */ + if (node_name != NULL) { + (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s", + node_name); + + err = mdesc_get_node_info(hp, mp, node_name, + &vdev->md_node_info); + if (err) { + pr_err("VIO: Could not get MD node info %s, err=%d\n", + dev_name(&vdev->dev), err); + kfree(vdev); + return NULL; + } + } + + pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n", + dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino); + + err = device_register(&vdev->dev); + if (err) { + printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", + dev_name(&vdev->dev), err); + put_device(&vdev->dev); + return NULL; + } + if (vdev->dp) + err = sysfs_create_file(&vdev->dev.kobj, + &dev_attr_obppath.attr); + + return vdev; +} + +static void vio_add(struct mdesc_handle *hp, u64 node, + const char *node_name) +{ + (void) vio_create_one(hp, node, node_name, &root_vdev->dev); +} + +struct vio_remove_node_data { + struct mdesc_handle *hp; + u64 node; +}; + +static int vio_md_node_match(struct device *dev, void *arg) +{ + struct vio_dev *vdev = to_vio_dev(dev); + struct vio_remove_node_data *node_data; + u64 node; + + node_data = (struct vio_remove_node_data *)arg; + + node = vio_vdev_node(node_data->hp, vdev); + + if (node == node_data->node) + return 1; + else + return 0; +} + +static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name) +{ + struct vio_remove_node_data node_data; + struct device *dev; + + node_data.hp = hp; + node_data.node = node; + + dev = device_find_child(&root_vdev->dev, (void *)&node_data, + vio_md_node_match); + if (dev) { + printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); + + device_unregister(dev); + put_device(dev); + } else { + pr_err("VIO: %s node not found in MDESC\n", node_name); + } +} + +static struct mdesc_notifier_client vio_device_notifier = { + .add = vio_add, + .remove = vio_remove, + .node_name = "virtual-device-port", +}; + +/* We are only interested in domain service ports under the + * "domain-services" node. On control nodes there is another port + * under "openboot" that we should not mess with as aparently that is + * reserved exclusively for OBP use. + */ +static void vio_add_ds(struct mdesc_handle *hp, u64 node, + const char *node_name) +{ + int found; + u64 a; + + found = 0; + mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) { + u64 target = mdesc_arc_target(hp, a); + const char *name = mdesc_node_name(hp, target); + + if (!strcmp(name, "domain-services")) { + found = 1; + break; + } + } + + if (found) + (void) vio_create_one(hp, node, node_name, &root_vdev->dev); +} + +static struct mdesc_notifier_client vio_ds_notifier = { + .add = vio_add_ds, + .remove = vio_remove, + .node_name = "domain-services-port", +}; + +static const char *channel_devices_node = "channel-devices"; +static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; +static const char *cfg_handle_prop = "cfg-handle"; + +static int __init vio_init(void) +{ + struct mdesc_handle *hp; + const char *compat; + const u64 *cfg_handle; + int err, len; + u64 root; + + err = bus_register(&vio_bus_type); + if (err) { + printk(KERN_ERR "VIO: Could not register bus type err=%d\n", + err); + return err; + } + + hp = mdesc_grab(); + if (!hp) + return 0; + + root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); + if (root == MDESC_NODE_NULL) { + printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); + mdesc_release(hp); + return 0; + } + + cdev_node = of_find_node_by_name(NULL, "channel-devices"); + err = -ENODEV; + if (!cdev_node) { + printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); + goto out_release; + } + + compat = mdesc_get_property(hp, root, "compatible", &len); + if (!compat) { + printk(KERN_ERR "VIO: Channel devices lacks compatible " + "property\n"); + goto out_release; + } + if (!of_find_in_proplist(compat, channel_devices_compat, len)) { + printk(KERN_ERR "VIO: Channel devices node lacks (%s) " + "compat entry.\n", channel_devices_compat); + goto out_release; + } + + cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); + if (!cfg_handle) { + printk(KERN_ERR "VIO: Channel devices lacks %s property\n", + cfg_handle_prop); + goto out_release; + } + + cdev_cfg_handle = *cfg_handle; + + root_vdev = vio_create_one(hp, root, NULL, NULL); + err = -ENODEV; + if (!root_vdev) { + printk(KERN_ERR "VIO: Could not create root device.\n"); + goto out_release; + } + + mdesc_register_notifier(&vio_device_notifier); + mdesc_register_notifier(&vio_ds_notifier); + + mdesc_release(hp); + + return err; + +out_release: + mdesc_release(hp); + return err; +} + +postcore_initcall(vio_init); |