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