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net/ism: Add new API for client registration
Add a new API that allows other drivers to concurrently access ISM devices. To do so, we introduce a new API that allows other modules to register for ISM device usage. Furthermore, we move the GID to struct ism, where it belongs conceptually, and rename and relocate struct smcd_event to struct ism_event. This is the first part of a bigger overhaul of the interfaces between SMC and ISM. Signed-off-by: Stefan Raspl <raspl@linux.ibm.com> Signed-off-by: Jan Karcher <jaka@linux.ibm.com> Signed-off-by: Wenjia Zhang <wenjia@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Raspl
David S. Miller
parent
1baedb13f1
commit
89e7d2ba61
@ -16,7 +16,6 @@
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*/
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#define ISM_DMB_WORD_OFFSET 1
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#define ISM_DMB_BIT_OFFSET (ISM_DMB_WORD_OFFSET * 32)
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#define ISM_NR_DMBS 1920
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#define ISM_IDENT_MASK 0x00FFFF
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#define ISM_REG_SBA 0x1
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@ -178,7 +177,7 @@ struct ism_eq_header {
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struct ism_eq {
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struct ism_eq_header header;
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struct smcd_event entry[15];
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struct ism_event entry[15];
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};
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struct ism_sba {
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@ -190,21 +189,6 @@ struct ism_sba {
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u16 dmbe_mask[ISM_NR_DMBS];
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};
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struct ism_dev {
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spinlock_t lock;
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struct pci_dev *pdev;
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struct smcd_dev *smcd;
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struct ism_sba *sba;
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dma_addr_t sba_dma_addr;
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DECLARE_BITMAP(sba_bitmap, ISM_NR_DMBS);
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struct ism_eq *ieq;
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dma_addr_t ieq_dma_addr;
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int ieq_idx;
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};
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#define ISM_CREATE_REQ(dmb, idx, sf, offset) \
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((dmb) | (idx) << 24 | (sf) << 23 | (offset))
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@ -15,9 +15,6 @@
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#include <linux/err.h>
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#include <linux/ctype.h>
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#include <linux/processor.h>
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#include <net/smc.h>
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#include <asm/debug.h>
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#include "ism.h"
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@ -34,6 +31,84 @@ static const struct pci_device_id ism_device_table[] = {
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MODULE_DEVICE_TABLE(pci, ism_device_table);
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static debug_info_t *ism_debug_info;
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static const struct smcd_ops ism_ops;
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#define NO_CLIENT 0xff /* must be >= MAX_CLIENTS */
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static struct ism_client *clients[MAX_CLIENTS]; /* use an array rather than */
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/* a list for fast mapping */
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static u8 max_client;
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static DEFINE_SPINLOCK(clients_lock);
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struct ism_dev_list {
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struct list_head list;
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struct mutex mutex; /* protects ism device list */
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};
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static struct ism_dev_list ism_dev_list = {
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.list = LIST_HEAD_INIT(ism_dev_list.list),
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.mutex = __MUTEX_INITIALIZER(ism_dev_list.mutex),
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};
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int ism_register_client(struct ism_client *client)
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{
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struct ism_dev *ism;
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unsigned long flags;
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int i, rc = -ENOSPC;
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mutex_lock(&ism_dev_list.mutex);
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spin_lock_irqsave(&clients_lock, flags);
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for (i = 0; i < MAX_CLIENTS; ++i) {
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if (!clients[i]) {
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clients[i] = client;
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client->id = i;
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if (i == max_client)
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max_client++;
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rc = 0;
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break;
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}
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}
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spin_unlock_irqrestore(&clients_lock, flags);
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if (i < MAX_CLIENTS) {
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/* initialize with all devices that we got so far */
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list_for_each_entry(ism, &ism_dev_list.list, list) {
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ism->priv[i] = NULL;
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client->add(ism);
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}
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}
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mutex_unlock(&ism_dev_list.mutex);
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return rc;
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}
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EXPORT_SYMBOL_GPL(ism_register_client);
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int ism_unregister_client(struct ism_client *client)
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{
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struct ism_dev *ism;
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unsigned long flags;
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int rc = 0;
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mutex_lock(&ism_dev_list.mutex);
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spin_lock_irqsave(&clients_lock, flags);
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clients[client->id] = NULL;
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if (client->id + 1 == max_client)
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max_client--;
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spin_unlock_irqrestore(&clients_lock, flags);
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list_for_each_entry(ism, &ism_dev_list.list, list) {
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for (int i = 0; i < ISM_NR_DMBS; ++i) {
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if (ism->sba_client_arr[i] == client->id) {
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pr_err("%s: attempt to unregister client '%s'"
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"with registered dmb(s)\n", __func__,
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client->name);
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rc = -EBUSY;
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goto out;
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}
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}
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}
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out:
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mutex_unlock(&ism_dev_list.mutex);
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return rc;
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}
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EXPORT_SYMBOL_GPL(ism_unregister_client);
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static int ism_cmd(struct ism_dev *ism, void *cmd)
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{
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@ -193,7 +268,7 @@ static int ism_read_local_gid(struct ism_dev *ism)
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if (ret)
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goto out;
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ism->smcd->local_gid = cmd.response.gid;
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ism->local_gid = cmd.response.gid;
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out:
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return ret;
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}
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@ -437,7 +512,8 @@ static u16 ism_get_chid(struct smcd_dev *smcd)
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static void ism_handle_event(struct ism_dev *ism)
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{
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struct smcd_event *entry;
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struct ism_event *entry;
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int i;
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while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) {
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if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry))
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@ -445,13 +521,18 @@ static void ism_handle_event(struct ism_dev *ism)
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entry = &ism->ieq->entry[ism->ieq_idx];
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debug_event(ism_debug_info, 2, entry, sizeof(*entry));
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smcd_handle_event(ism->smcd, entry);
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spin_lock(&clients_lock);
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for (i = 0; i < max_client; ++i)
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if (clients[i])
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clients[i]->handle_event(ism, entry);
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spin_unlock(&clients_lock);
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}
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}
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static irqreturn_t ism_handle_irq(int irq, void *data)
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{
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struct ism_dev *ism = data;
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struct ism_client *clt;
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unsigned long bit, end;
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unsigned long *bv;
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u16 dmbemask;
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@ -471,7 +552,8 @@ static irqreturn_t ism_handle_irq(int irq, void *data)
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dmbemask = ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET];
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ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0;
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barrier();
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smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET, dmbemask);
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clt = clients[ism->sba_client_arr[bit]];
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clt->handle_irq(ism, bit + ISM_DMB_BIT_OFFSET, dmbemask);
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}
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if (ism->sba->e) {
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@ -497,10 +579,21 @@ static const struct smcd_ops ism_ops = {
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.get_chid = ism_get_chid,
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};
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static void ism_dev_add_work_func(struct work_struct *work)
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{
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struct ism_client *client = container_of(work, struct ism_client,
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add_work);
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client->add(client->tgt_ism);
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atomic_dec(&client->tgt_ism->add_dev_cnt);
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wake_up(&client->tgt_ism->waitq);
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}
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static int ism_dev_init(struct ism_dev *ism)
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{
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struct pci_dev *pdev = ism->pdev;
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int ret;
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unsigned long flags;
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int i, ret;
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ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
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if (ret <= 0)
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@ -527,6 +620,28 @@ static int ism_dev_init(struct ism_dev *ism)
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/* hardware is V2 capable */
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ism_create_system_eid();
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init_waitqueue_head(&ism->waitq);
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atomic_set(&ism->free_clients_cnt, 0);
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atomic_set(&ism->add_dev_cnt, 0);
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wait_event(ism->waitq, !atomic_read(&ism->add_dev_cnt));
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spin_lock_irqsave(&clients_lock, flags);
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for (i = 0; i < max_client; ++i)
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if (clients[i]) {
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INIT_WORK(&clients[i]->add_work,
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ism_dev_add_work_func);
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clients[i]->tgt_ism = ism;
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atomic_inc(&ism->add_dev_cnt);
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schedule_work(&clients[i]->add_work);
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}
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spin_unlock_irqrestore(&clients_lock, flags);
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wait_event(ism->waitq, !atomic_read(&ism->add_dev_cnt));
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mutex_lock(&ism_dev_list.mutex);
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list_add(&ism->list, &ism_dev_list.list);
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mutex_unlock(&ism_dev_list.mutex);
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ret = smcd_register_dev(ism->smcd);
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if (ret)
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goto unreg_ieq;
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@ -602,9 +717,36 @@ err:
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return ret;
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}
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static void ism_dev_remove_work_func(struct work_struct *work)
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{
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struct ism_client *client = container_of(work, struct ism_client,
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remove_work);
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client->remove(client->tgt_ism);
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atomic_dec(&client->tgt_ism->free_clients_cnt);
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wake_up(&client->tgt_ism->waitq);
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}
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/* Callers must hold ism_dev_list.mutex */
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static void ism_dev_exit(struct ism_dev *ism)
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{
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struct pci_dev *pdev = ism->pdev;
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unsigned long flags;
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int i;
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wait_event(ism->waitq, !atomic_read(&ism->free_clients_cnt));
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spin_lock_irqsave(&clients_lock, flags);
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for (i = 0; i < max_client; ++i)
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if (clients[i]) {
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INIT_WORK(&clients[i]->remove_work,
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ism_dev_remove_work_func);
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clients[i]->tgt_ism = ism;
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atomic_inc(&ism->free_clients_cnt);
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schedule_work(&clients[i]->remove_work);
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}
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spin_unlock_irqrestore(&clients_lock, flags);
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wait_event(ism->waitq, !atomic_read(&ism->free_clients_cnt));
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smcd_unregister_dev(ism->smcd);
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if (SYSTEM_EID.serial_number[0] != '0' ||
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@ -614,18 +756,22 @@ static void ism_dev_exit(struct ism_dev *ism)
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unregister_sba(ism);
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free_irq(pci_irq_vector(pdev, 0), ism);
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pci_free_irq_vectors(pdev);
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list_del_init(&ism->list);
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}
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static void ism_remove(struct pci_dev *pdev)
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{
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struct ism_dev *ism = dev_get_drvdata(&pdev->dev);
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mutex_lock(&ism_dev_list.mutex);
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ism_dev_exit(ism);
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mutex_unlock(&ism_dev_list.mutex);
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smcd_free_dev(ism->smcd);
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pci_clear_master(pdev);
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pci_release_mem_regions(pdev);
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pci_disable_device(pdev);
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device_del(&ism->dev);
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dev_set_drvdata(&pdev->dev, NULL);
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kfree(ism);
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}
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@ -645,6 +791,8 @@ static int __init ism_init(void)
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if (!ism_debug_info)
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return -ENODEV;
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memset(clients, 0, sizeof(clients));
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max_client = 0;
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debug_register_view(ism_debug_info, &debug_hex_ascii_view);
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ret = pci_register_driver(&ism_driver);
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if (ret)
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@ -655,6 +803,14 @@ static int __init ism_init(void)
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static void __exit ism_exit(void)
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{
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struct ism_dev *ism;
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mutex_lock(&ism_dev_list.mutex);
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list_for_each_entry(ism, &ism_dev_list.list, list) {
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ism_dev_exit(ism);
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}
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mutex_unlock(&ism_dev_list.mutex);
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pci_unregister_driver(&ism_driver);
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debug_unregister(ism_debug_info);
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}
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@ -9,6 +9,8 @@
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#ifndef _ISM_H
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#define _ISM_H
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#include <linux/workqueue.h>
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struct ism_dmb {
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u64 dmb_tok;
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u64 rgid;
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@ -20,4 +22,69 @@ struct ism_dmb {
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dma_addr_t dma_addr;
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};
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/* Unless we gain unexpected popularity, this limit should hold for a while */
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#define MAX_CLIENTS 8
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#define ISM_NR_DMBS 1920
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struct ism_dev {
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spinlock_t lock; /* protects the ism device */
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struct list_head list;
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struct pci_dev *pdev;
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struct smcd_dev *smcd;
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struct ism_sba *sba;
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dma_addr_t sba_dma_addr;
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DECLARE_BITMAP(sba_bitmap, ISM_NR_DMBS);
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u8 *sba_client_arr; /* entries are indices into 'clients' array */
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void *priv[MAX_CLIENTS];
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struct ism_eq *ieq;
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dma_addr_t ieq_dma_addr;
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struct device dev;
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u64 local_gid;
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int ieq_idx;
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atomic_t free_clients_cnt;
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atomic_t add_dev_cnt;
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wait_queue_head_t waitq;
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};
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struct ism_event {
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u32 type;
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u32 code;
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u64 tok;
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u64 time;
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u64 info;
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};
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struct ism_client {
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const char *name;
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void (*add)(struct ism_dev *dev);
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void (*remove)(struct ism_dev *dev);
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void (*handle_event)(struct ism_dev *dev, struct ism_event *event);
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/* Parameter dmbemask contains a bit vector with updated DMBEs, if sent
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* via ism_move_data(). Callback function must handle all active bits
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* indicated by dmbemask.
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*/
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void (*handle_irq)(struct ism_dev *dev, unsigned int bit, u16 dmbemask);
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/* Private area - don't touch! */
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struct work_struct remove_work;
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struct work_struct add_work;
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struct ism_dev *tgt_ism;
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u8 id;
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};
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int ism_register_client(struct ism_client *client);
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int ism_unregister_client(struct ism_client *client);
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static inline void *ism_get_priv(struct ism_dev *dev,
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struct ism_client *client) {
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return dev->priv[client->id];
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}
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static inline void ism_set_priv(struct ism_dev *dev, struct ism_client *client,
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void *priv) {
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dev->priv[client->id] = priv;
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}
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#endif /* _ISM_H */
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@ -15,6 +15,7 @@
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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#include "linux/ism.h"
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struct sock;
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@ -48,14 +49,6 @@ struct smcd_dmb {
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#define ISM_ERROR 0xFFFF
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struct smcd_event {
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u32 type;
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u32 code;
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u64 tok;
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u64 time;
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u64 info;
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};
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struct smcd_dev;
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struct smcd_ops {
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@ -100,6 +93,6 @@ struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
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int smcd_register_dev(struct smcd_dev *smcd);
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void smcd_unregister_dev(struct smcd_dev *smcd);
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void smcd_free_dev(struct smcd_dev *smcd);
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void smcd_handle_event(struct smcd_dev *dev, struct smcd_event *event);
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void smcd_handle_event(struct smcd_dev *dev, struct ism_event *event);
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void smcd_handle_irq(struct smcd_dev *dev, unsigned int bit, u16 dmbemask);
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#endif /* _SMC_H */
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@ -296,7 +296,7 @@ int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
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struct smc_ism_event_work {
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struct work_struct work;
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struct smcd_dev *smcd;
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struct smcd_event event;
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struct ism_event event;
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};
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#define ISM_EVENT_REQUEST 0x0001
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@ -490,7 +490,7 @@ EXPORT_SYMBOL_GPL(smcd_free_dev);
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* Context:
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* - Function called in IRQ context from ISM device driver event handler.
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*/
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void smcd_handle_event(struct smcd_dev *smcd, struct smcd_event *event)
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void smcd_handle_event(struct smcd_dev *smcd, struct ism_event *event)
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{
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struct smc_ism_event_work *wrk;
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