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net/ism: Add new API for client registration

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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
2023-01-23 19:17:48 +01:00
committed by David S. Miller
parent 1baedb13f1
commit 89e7d2ba61
5 changed files with 236 additions and 36 deletions
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67
include/linux/ism.h
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@@ -9,6 +9,8 @@
#ifndef _ISM_H
#define _ISM_H
#include <linux/workqueue.h>
struct ism_dmb {
u64 dmb_tok;
u64 rgid;
@@ -20,4 +22,69 @@ struct ism_dmb {
dma_addr_t dma_addr;
};
/* Unless we gain unexpected popularity, this limit should hold for a while */
#define MAX_CLIENTS 8
#define ISM_NR_DMBS 1920
struct ism_dev {
spinlock_t lock; /* protects the ism device */
struct list_head list;
struct pci_dev *pdev;
struct smcd_dev *smcd;
struct ism_sba *sba;
dma_addr_t sba_dma_addr;
DECLARE_BITMAP(sba_bitmap, ISM_NR_DMBS);
u8 *sba_client_arr; /* entries are indices into 'clients' array */
void *priv[MAX_CLIENTS];
struct ism_eq *ieq;
dma_addr_t ieq_dma_addr;
struct device dev;
u64 local_gid;
int ieq_idx;
atomic_t free_clients_cnt;
atomic_t add_dev_cnt;
wait_queue_head_t waitq;
};
struct ism_event {
u32 type;
u32 code;
u64 tok;
u64 time;
u64 info;
};
struct ism_client {
const char *name;
void (*add)(struct ism_dev *dev);
void (*remove)(struct ism_dev *dev);
void (*handle_event)(struct ism_dev *dev, struct ism_event *event);
/* Parameter dmbemask contains a bit vector with updated DMBEs, if sent
* via ism_move_data(). Callback function must handle all active bits
* indicated by dmbemask.
*/
void (*handle_irq)(struct ism_dev *dev, unsigned int bit, u16 dmbemask);
/* Private area - don't touch! */
struct work_struct remove_work;
struct work_struct add_work;
struct ism_dev *tgt_ism;
u8 id;
};
int ism_register_client(struct ism_client *client);
int ism_unregister_client(struct ism_client *client);
static inline void *ism_get_priv(struct ism_dev *dev,
struct ism_client *client) {
return dev->priv[client->id];
}
static inline void ism_set_priv(struct ism_dev *dev, struct ism_client *client,
void *priv) {
dev->priv[client->id] = priv;
}
#endif /* _ISM_H */