^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Shared Memory Communications Direct over ISM devices (SMC-D)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Functions for ISM device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright IBM Corp. 2018
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "smc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "smc_core.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "smc_ism.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "smc_pnet.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) struct smcd_dev_list smcd_dev_list = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) .list = LIST_HEAD_INIT(smcd_dev_list.list),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) .mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) bool smc_ism_v2_capable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /* Test if an ISM communication is possible - same CPC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) vlan_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int smc_ism_write(struct smcd_dev *smcd, const struct smc_ism_position *pos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) void *data, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) rc = smcd->ops->move_data(smcd, pos->token, pos->index, pos->signal,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) pos->offset, data, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return rc < 0 ? rc : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) void smc_ism_get_system_eid(struct smcd_dev *smcd, u8 **eid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) smcd->ops->get_system_eid(smcd, eid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) u16 smc_ism_get_chid(struct smcd_dev *smcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return smcd->ops->get_chid(smcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /* Set a connection using this DMBE. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) void smc_ism_set_conn(struct smc_connection *conn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /* Unset a connection using this DMBE. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) void smc_ism_unset_conn(struct smc_connection *conn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (!conn->rmb_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) /* Register a VLAN identifier with the ISM device. Use a reference count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * and add a VLAN identifier only when the first DMB using this VLAN is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * registered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct smc_ism_vlanid *new_vlan, *vlan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (!vlanid) /* No valid vlan id */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* create new vlan entry, in case we need it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (!new_vlan)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) new_vlan->vlanid = vlanid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) refcount_set(&new_vlan->refcnt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* if there is an existing entry, increase count and return */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) spin_lock_irqsave(&smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) list_for_each_entry(vlan, &smcd->vlan, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) if (vlan->vlanid == vlanid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) refcount_inc(&vlan->refcnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) kfree(new_vlan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /* no existing entry found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * add new entry to device; might fail, e.g., if HW limit reached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (smcd->ops->add_vlan_id(smcd, vlanid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) kfree(new_vlan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) list_add_tail(&new_vlan->list, &smcd->vlan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) spin_unlock_irqrestore(&smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Unregister a VLAN identifier with the ISM device. Use a reference count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * and remove a VLAN identifier only when the last DMB using this VLAN is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * unregistered.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct smc_ism_vlanid *vlan;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) bool found = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (!vlanid) /* No valid vlan id */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) spin_lock_irqsave(&smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) list_for_each_entry(vlan, &smcd->vlan, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (vlan->vlanid == vlanid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (!refcount_dec_and_test(&vlan->refcnt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) found = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) if (!found) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) rc = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) goto out; /* VLAN id not in table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /* Found and the last reference just gone */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (smcd->ops->del_vlan_id(smcd, vlanid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) list_del(&vlan->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) kfree(vlan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) spin_unlock_irqrestore(&smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct smcd_dmb dmb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (!dmb_desc->dma_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) memset(&dmb, 0, sizeof(dmb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) dmb.dmb_tok = dmb_desc->token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) dmb.sba_idx = dmb_desc->sba_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) dmb.cpu_addr = dmb_desc->cpu_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) dmb.dma_addr = dmb_desc->dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) dmb.dmb_len = dmb_desc->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) rc = smcd->ops->unregister_dmb(smcd, &dmb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (!rc || rc == ISM_ERROR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) dmb_desc->cpu_addr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) dmb_desc->dma_addr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct smc_buf_desc *dmb_desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct smcd_dmb dmb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) memset(&dmb, 0, sizeof(dmb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) dmb.dmb_len = dmb_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) dmb.sba_idx = dmb_desc->sba_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) dmb.vlan_id = lgr->vlan_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) dmb.rgid = lgr->peer_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) rc = lgr->smcd->ops->register_dmb(lgr->smcd, &dmb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) dmb_desc->sba_idx = dmb.sba_idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) dmb_desc->token = dmb.dmb_tok;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) dmb_desc->cpu_addr = dmb.cpu_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) dmb_desc->dma_addr = dmb.dma_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) dmb_desc->len = dmb.dmb_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct smc_ism_event_work {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct work_struct work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct smcd_dev *smcd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) struct smcd_event event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) #define ISM_EVENT_REQUEST 0x0001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) #define ISM_EVENT_RESPONSE 0x0002
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) #define ISM_EVENT_REQUEST_IR 0x00000001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) #define ISM_EVENT_CODE_SHUTDOWN 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) #define ISM_EVENT_CODE_TESTLINK 0x83
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) union smcd_sw_event_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) u64 info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) u8 uid[SMC_LGR_ID_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) unsigned short vlan_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) u16 code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) union smcd_sw_event_info ev_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) ev_info.info = wrk->event.info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) switch (wrk->event.code) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) case ISM_EVENT_CODE_SHUTDOWN: /* Peer shut down DMBs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) smc_smcd_terminate(wrk->smcd, wrk->event.tok, ev_info.vlan_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) case ISM_EVENT_CODE_TESTLINK: /* Activity timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (ev_info.code == ISM_EVENT_REQUEST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) ev_info.code = ISM_EVENT_RESPONSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) wrk->smcd->ops->signal_event(wrk->smcd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) wrk->event.tok,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) ISM_EVENT_REQUEST_IR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) ISM_EVENT_CODE_TESTLINK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) ev_info.info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) int smc_ism_signal_shutdown(struct smc_link_group *lgr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) union smcd_sw_event_info ev_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (lgr->peer_shutdown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) ev_info.vlan_id = lgr->vlan_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ev_info.code = ISM_EVENT_REQUEST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) rc = lgr->smcd->ops->signal_event(lgr->smcd, lgr->peer_gid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) ISM_EVENT_REQUEST_IR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) ISM_EVENT_CODE_SHUTDOWN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) ev_info.info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) /* worker for SMC-D events */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static void smc_ism_event_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct smc_ism_event_work *wrk =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) container_of(work, struct smc_ism_event_work, work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) switch (wrk->event.type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) case ISM_EVENT_GID: /* GID event, token is peer GID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) smc_smcd_terminate(wrk->smcd, wrk->event.tok, VLAN_VID_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) case ISM_EVENT_DMB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) case ISM_EVENT_SWR: /* Software defined event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) smcd_handle_sw_event(wrk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) kfree(wrk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static void smcd_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) struct smcd_dev *smcd = container_of(dev, struct smcd_dev, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) kfree(smcd->conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) kfree(smcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) const struct smcd_ops *ops, int max_dmbs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct smcd_dev *smcd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) smcd = kzalloc(sizeof(*smcd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (!smcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) if (!smcd->conn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) kfree(smcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) WQ_MEM_RECLAIM, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) if (!smcd->event_wq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) kfree(smcd->conn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) kfree(smcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) smcd->dev.parent = parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) smcd->dev.release = smcd_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) device_initialize(&smcd->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) dev_set_name(&smcd->dev, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) smcd->ops = ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (smc_pnetid_by_dev_port(parent, 0, smcd->pnetid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) smc_pnetid_by_table_smcd(smcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) spin_lock_init(&smcd->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) spin_lock_init(&smcd->lgr_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) INIT_LIST_HEAD(&smcd->vlan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) INIT_LIST_HEAD(&smcd->lgr_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) init_waitqueue_head(&smcd->lgrs_deleted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return smcd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) EXPORT_SYMBOL_GPL(smcd_alloc_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int smcd_register_dev(struct smcd_dev *smcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) mutex_lock(&smcd_dev_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (list_empty(&smcd_dev_list.list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) u8 *system_eid = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) smc_ism_get_system_eid(smcd, &system_eid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (system_eid[24] != '0' || system_eid[28] != '0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) smc_ism_v2_capable = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /* sort list: devices without pnetid before devices with pnetid */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (smcd->pnetid[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) list_add_tail(&smcd->list, &smcd_dev_list.list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) list_add(&smcd->list, &smcd_dev_list.list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) mutex_unlock(&smcd_dev_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) dev_name(&smcd->dev), smcd->pnetid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) smcd->pnetid_by_user ? " (user defined)" : "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) rc = device_add(&smcd->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) mutex_lock(&smcd_dev_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) list_del(&smcd->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) mutex_unlock(&smcd_dev_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) EXPORT_SYMBOL_GPL(smcd_register_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) void smcd_unregister_dev(struct smcd_dev *smcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) pr_warn_ratelimited("smc: removing smcd device %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) dev_name(&smcd->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) mutex_lock(&smcd_dev_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) list_del_init(&smcd->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) mutex_unlock(&smcd_dev_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) smcd->going_away = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) smc_smcd_terminate_all(smcd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) flush_workqueue(smcd->event_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) destroy_workqueue(smcd->event_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) device_del(&smcd->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) EXPORT_SYMBOL_GPL(smcd_unregister_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) void smcd_free_dev(struct smcd_dev *smcd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) put_device(&smcd->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) EXPORT_SYMBOL_GPL(smcd_free_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) /* SMCD Device event handler. Called from ISM device interrupt handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) * Parameters are smcd device pointer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) * - event->type (0 --> DMB, 1 --> GID),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) * - event->code (event code),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) * - event->tok (either DMB token when event type 0, or GID when event type 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * - event->time (time of day)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) * - event->info (debug info).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) * Context:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) * - Function called in IRQ context from ISM device driver event handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) void smcd_handle_event(struct smcd_dev *smcd, struct smcd_event *event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct smc_ism_event_work *wrk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (smcd->going_away)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) /* copy event to event work queue, and let it be handled there */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (!wrk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) INIT_WORK(&wrk->work, smc_ism_event_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) wrk->smcd = smcd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) wrk->event = *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) queue_work(smcd->event_wq, &wrk->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) EXPORT_SYMBOL_GPL(smcd_handle_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /* SMCD Device interrupt handler. Called from ISM device interrupt handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * Parameters are smcd device pointer and DMB number. Find the connection and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * schedule the tasklet for this connection.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * Context:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * - Function called in IRQ context from ISM device driver IRQ handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) void smcd_handle_irq(struct smcd_dev *smcd, unsigned int dmbno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) struct smc_connection *conn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) spin_lock_irqsave(&smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) conn = smcd->conn[dmbno];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (conn && !conn->killed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) tasklet_schedule(&conn->rx_tsklet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) spin_unlock_irqrestore(&smcd->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) EXPORT_SYMBOL_GPL(smcd_handle_irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) void __init smc_ism_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) smc_ism_v2_capable = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags