mirror of https://gitee.com/openkylin/linux.git
[SPARC64]: Fix race between MD update and dr-cpu add.
We need to make sure the MD update occurs before we try to process dr-cpu configure requests. MD update and dr-cpu were being processed by seperate threads so that did not happen occaisionally. Fix this by executing all domain services data packets from a single thread, in order. This will help simplify some other things as well. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
3ac66e33ea
commit
778feeb475
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@ -228,7 +228,7 @@ static struct ds_cap_state *find_cap_by_string(const char *name)
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return NULL;
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}
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static int ds_send(struct ldc_channel *lp, void *data, int len)
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static int __ds_send(struct ldc_channel *lp, void *data, int len)
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{
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int err, limit = 1000;
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@ -243,6 +243,18 @@ static int ds_send(struct ldc_channel *lp, void *data, int len)
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return err;
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}
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static int ds_send(struct ldc_channel *lp, void *data, int len)
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{
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unsigned long flags;
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int err;
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spin_lock_irqsave(&ds_lock, flags);
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err = __ds_send(lp, data, len);
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spin_unlock_irqrestore(&ds_lock, flags);
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return err;
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}
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struct ds_md_update_req {
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__u64 req_num;
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};
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@ -267,6 +279,8 @@ static void md_update_data(struct ldc_channel *lp,
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printk(KERN_INFO PFX "Machine description update.\n");
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mdesc_update();
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memset(&pkt, 0, sizeof(pkt));
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pkt.data.tag.type = DS_DATA;
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pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
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@ -275,8 +289,6 @@ static void md_update_data(struct ldc_channel *lp,
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pkt.res.result = DS_OK;
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ds_send(lp, &pkt, sizeof(pkt));
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mdesc_update();
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}
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struct ds_shutdown_req {
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@ -391,18 +403,6 @@ struct dr_cpu_resp_entry {
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__u32 str_off;
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};
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/* DR cpu requests get queued onto the work list by the
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* dr_cpu_data() callback. The list is protected by
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* ds_lock, and processed by dr_cpu_process() in order.
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*/
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static LIST_HEAD(dr_cpu_work_list);
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static DECLARE_WAIT_QUEUE_HEAD(dr_cpu_wait);
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struct dr_cpu_queue_entry {
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struct list_head list;
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char req[0];
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};
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static void __dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data)
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{
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struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
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@ -425,7 +425,7 @@ static void __dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data)
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pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
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ds_send(dp->lp, &pkt, msg_len);
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__ds_send(dp->lp, &pkt, msg_len);
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}
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static void dr_cpu_send_error(struct ds_cap_state *cp, struct ds_data *data)
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@ -555,7 +555,7 @@ static int dr_cpu_configure(struct ds_cap_state *cp, u64 req_num,
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}
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spin_lock_irqsave(&ds_lock, flags);
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ds_send(ds_info->lp, resp, resp_len);
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__ds_send(ds_info->lp, resp, resp_len);
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spin_unlock_irqrestore(&ds_lock, flags);
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kfree(resp);
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@ -596,7 +596,7 @@ static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num,
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}
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spin_lock_irqsave(&ds_lock, flags);
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ds_send(ds_info->lp, resp, resp_len);
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__ds_send(ds_info->lp, resp, resp_len);
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spin_unlock_irqrestore(&ds_lock, flags);
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kfree(resp);
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@ -604,107 +604,49 @@ static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num,
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return 0;
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}
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static void process_dr_cpu_list(struct ds_cap_state *cp)
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{
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struct dr_cpu_queue_entry *qp, *tmp;
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unsigned long flags;
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LIST_HEAD(todo);
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cpumask_t mask;
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spin_lock_irqsave(&ds_lock, flags);
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list_splice(&dr_cpu_work_list, &todo);
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INIT_LIST_HEAD(&dr_cpu_work_list);
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spin_unlock_irqrestore(&ds_lock, flags);
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list_for_each_entry_safe(qp, tmp, &todo, list) {
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struct ds_data *data = (struct ds_data *) qp->req;
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struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
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u32 *cpu_list = (u32 *) (tag + 1);
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u64 req_num = tag->req_num;
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unsigned int i;
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int err;
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switch (tag->type) {
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case DR_CPU_CONFIGURE:
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case DR_CPU_UNCONFIGURE:
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case DR_CPU_FORCE_UNCONFIGURE:
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break;
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default:
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dr_cpu_send_error(cp, data);
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goto next;
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}
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purge_dups(cpu_list, tag->num_records);
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cpus_clear(mask);
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for (i = 0; i < tag->num_records; i++) {
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if (cpu_list[i] == CPU_SENTINEL)
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continue;
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if (cpu_list[i] < NR_CPUS)
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cpu_set(cpu_list[i], mask);
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}
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if (tag->type == DR_CPU_CONFIGURE)
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err = dr_cpu_configure(cp, req_num, &mask);
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else
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err = dr_cpu_unconfigure(cp, req_num, &mask);
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if (err)
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dr_cpu_send_error(cp, data);
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next:
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list_del(&qp->list);
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kfree(qp);
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}
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}
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static int dr_cpu_thread(void *__unused)
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{
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struct ds_cap_state *cp;
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DEFINE_WAIT(wait);
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cp = find_cap_by_string("dr-cpu");
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while (1) {
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prepare_to_wait(&dr_cpu_wait, &wait, TASK_INTERRUPTIBLE);
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if (list_empty(&dr_cpu_work_list))
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schedule();
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finish_wait(&dr_cpu_wait, &wait);
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if (kthread_should_stop())
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break;
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process_dr_cpu_list(cp);
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}
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return 0;
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}
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static void dr_cpu_data(struct ldc_channel *lp,
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struct ds_cap_state *dp,
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struct ds_cap_state *cp,
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void *buf, int len)
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{
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struct dr_cpu_queue_entry *qp;
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struct ds_data *dpkt = buf;
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struct dr_cpu_tag *rp;
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struct ds_data *data = buf;
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struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
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u32 *cpu_list = (u32 *) (tag + 1);
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u64 req_num = tag->req_num;
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cpumask_t mask;
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unsigned int i;
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int err;
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rp = (struct dr_cpu_tag *) (dpkt + 1);
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switch (tag->type) {
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case DR_CPU_CONFIGURE:
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case DR_CPU_UNCONFIGURE:
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case DR_CPU_FORCE_UNCONFIGURE:
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break;
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qp = kmalloc(sizeof(struct dr_cpu_queue_entry) + len, GFP_ATOMIC);
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if (!qp) {
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struct ds_cap_state *cp;
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cp = find_cap_by_string("dr-cpu");
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__dr_cpu_send_error(cp, dpkt);
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} else {
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memcpy(&qp->req, buf, len);
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list_add_tail(&qp->list, &dr_cpu_work_list);
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wake_up(&dr_cpu_wait);
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default:
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dr_cpu_send_error(cp, data);
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return;
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}
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purge_dups(cpu_list, tag->num_records);
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cpus_clear(mask);
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for (i = 0; i < tag->num_records; i++) {
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if (cpu_list[i] == CPU_SENTINEL)
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continue;
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if (cpu_list[i] < NR_CPUS)
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cpu_set(cpu_list[i], mask);
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}
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if (tag->type == DR_CPU_CONFIGURE)
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err = dr_cpu_configure(cp, req_num, &mask);
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else
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err = dr_cpu_unconfigure(cp, req_num, &mask);
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if (err)
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dr_cpu_send_error(cp, data);
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}
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#endif
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#endif /* CONFIG_HOTPLUG_CPU */
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struct ds_pri_msg {
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__u64 req_num;
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@ -820,7 +762,7 @@ void ldom_set_var(const char *var, const char *value)
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ds_var_doorbell = 0;
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ds_var_response = -1;
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ds_send(dp->lp, &pkt, msg_len);
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__ds_send(dp->lp, &pkt, msg_len);
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spin_unlock_irqrestore(&ds_lock, flags);
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loops = 1000;
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@ -904,7 +846,7 @@ static int register_services(struct ds_info *dp)
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pbuf.req.minor = 0;
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strcpy(pbuf.req.svc_id, cp->service_id);
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err = ds_send(lp, &pbuf, msg_len);
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err = __ds_send(lp, &pbuf, msg_len);
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if (err > 0)
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cp->state = CAP_STATE_REG_SENT;
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}
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@ -960,27 +902,97 @@ static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
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return -ECONNRESET;
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}
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static void __send_ds_nack(struct ds_info *dp, u64 handle)
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{
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struct ds_data_nack nack = {
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.tag = {
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.type = DS_NACK,
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.len = (sizeof(struct ds_data_nack) -
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sizeof(struct ds_msg_tag)),
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},
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.handle = handle,
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.result = DS_INV_HDL,
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};
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__ds_send(dp->lp, &nack, sizeof(nack));
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}
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static LIST_HEAD(ds_work_list);
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static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
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struct ds_queue_entry {
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struct list_head list;
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int req_len;
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int __pad;
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u64 req[0];
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};
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static void process_ds_work(void)
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{
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struct ds_queue_entry *qp, *tmp;
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static struct ds_info *dp;
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unsigned long flags;
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LIST_HEAD(todo);
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spin_lock_irqsave(&ds_lock, flags);
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list_splice(&ds_work_list, &todo);
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INIT_LIST_HEAD(&ds_work_list);
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spin_unlock_irqrestore(&ds_lock, flags);
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dp = ds_info;
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list_for_each_entry_safe(qp, tmp, &todo, list) {
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struct ds_data *dpkt = (struct ds_data *) qp->req;
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struct ds_cap_state *cp = find_cap(dpkt->handle);
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int req_len = qp->req_len;
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if (!cp) {
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printk(KERN_ERR PFX "Data for unknown handle %lu\n",
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dpkt->handle);
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spin_lock_irqsave(&ds_lock, flags);
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__send_ds_nack(dp, dpkt->handle);
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spin_unlock_irqrestore(&ds_lock, flags);
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} else {
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cp->data(dp->lp, cp, dpkt, req_len);
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}
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list_del(&qp->list);
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kfree(qp);
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}
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}
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static int ds_thread(void *__unused)
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{
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DEFINE_WAIT(wait);
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while (1) {
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prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
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if (list_empty(&ds_work_list))
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schedule();
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finish_wait(&ds_wait, &wait);
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if (kthread_should_stop())
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break;
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process_ds_work();
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}
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return 0;
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}
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static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
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{
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struct ds_data *dpkt = (struct ds_data *) pkt;
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struct ds_cap_state *cp = find_cap(dpkt->handle);
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struct ds_queue_entry *qp;
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if (!cp) {
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struct ds_data_nack nack = {
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.tag = {
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.type = DS_NACK,
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.len = (sizeof(struct ds_data_nack) -
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sizeof(struct ds_msg_tag)),
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},
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.handle = dpkt->handle,
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.result = DS_INV_HDL,
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};
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printk(KERN_ERR PFX "Data for unknown handle %lu\n",
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dpkt->handle);
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ds_send(dp->lp, &nack, sizeof(nack));
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qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
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if (!qp) {
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__send_ds_nack(dp, dpkt->handle);
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} else {
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cp->data(dp->lp, cp, dpkt, len);
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memcpy(&qp->req, pkt, len);
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list_add_tail(&qp->list, &ds_work_list);
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wake_up(&ds_wait);
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}
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return 0;
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}
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@ -996,7 +1008,7 @@ static void ds_up(struct ds_info *dp)
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req.ver.major = 1;
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req.ver.minor = 0;
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err = ds_send(lp, &req, sizeof(req));
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err = __ds_send(lp, &req, sizeof(req));
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if (err > 0)
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dp->hs_state = DS_HS_START;
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}
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@ -1148,9 +1160,7 @@ static int __init ds_init(void)
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for (i = 0; i < ARRAY_SIZE(ds_states); i++)
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ds_states[i].handle = ((u64)i << 32);
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#ifdef CONFIG_HOTPLUG_CPU
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kthread_run(dr_cpu_thread, NULL, "kdrcpud");
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#endif
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kthread_run(ds_thread, NULL, "kldomd");
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return vio_register_driver(&ds_driver);
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}
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@ -214,7 +214,7 @@ void mdesc_release(struct mdesc_handle *hp)
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}
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EXPORT_SYMBOL(mdesc_release);
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static void do_mdesc_update(struct work_struct *work)
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void mdesc_update(void)
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{
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unsigned long len, real_len, status;
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struct mdesc_handle *hp, *orig_hp;
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@ -248,13 +248,6 @@ static void do_mdesc_update(struct work_struct *work)
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spin_unlock_irqrestore(&mdesc_lock, flags);
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}
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static DECLARE_WORK(mdesc_update_work, do_mdesc_update);
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void mdesc_update(void)
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{
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schedule_work(&mdesc_update_work);
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}
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static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
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{
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return (struct mdesc_elem *) (mdesc + 1);
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@ -278,13 +271,14 @@ u64 mdesc_node_by_name(struct mdesc_handle *hp,
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u64 last_node = hp->mdesc.node_sz / 16;
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u64 ret;
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if (from_node == MDESC_NODE_NULL)
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from_node = 0;
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if (from_node >= last_node)
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if (from_node == MDESC_NODE_NULL) {
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ret = from_node = 0;
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} else if (from_node >= last_node) {
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return MDESC_NODE_NULL;
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} else {
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ret = ep[from_node].d.val;
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}
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ret = ep[from_node].d.val;
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while (ret < last_node) {
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if (ep[ret].tag != MD_NODE)
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return MDESC_NODE_NULL;
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