mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 00:58:17 +07:00
582563074a
In the current mailbox driver, the mailbox internal pointer for callback can be directly manipulated by the Users, so a second User can easily corrupt the first user's callback pointer. The initial effort to correct this issue can be referred here: https://patchwork.kernel.org/patch/107520/ Along with fixing the above stated issue, this patch adds the flexibility option to register notifications from multiple readers to the events received on a mailbox instance. The discussion regarding this can be referred here. http://www.mail-archive.com/linux-omap@vger.kernel.org/msg30671.html Signed-off-by: Hari Kanigeri <h-kanigeri2@ti.com> Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com> Acked-by: Hiroshi Doyu <hiroshi.doyu@nokia.com>
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* mailbox.h */
|
|
|
|
#ifndef MAILBOX_H
|
|
#define MAILBOX_H
|
|
|
|
#include <linux/spinlock.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kfifo.h>
|
|
|
|
typedef u32 mbox_msg_t;
|
|
struct omap_mbox;
|
|
|
|
typedef int __bitwise omap_mbox_irq_t;
|
|
#define IRQ_TX ((__force omap_mbox_irq_t) 1)
|
|
#define IRQ_RX ((__force omap_mbox_irq_t) 2)
|
|
|
|
typedef int __bitwise omap_mbox_type_t;
|
|
#define OMAP_MBOX_TYPE1 ((__force omap_mbox_type_t) 1)
|
|
#define OMAP_MBOX_TYPE2 ((__force omap_mbox_type_t) 2)
|
|
|
|
struct omap_mbox_ops {
|
|
omap_mbox_type_t type;
|
|
int (*startup)(struct omap_mbox *mbox);
|
|
void (*shutdown)(struct omap_mbox *mbox);
|
|
/* fifo */
|
|
mbox_msg_t (*fifo_read)(struct omap_mbox *mbox);
|
|
void (*fifo_write)(struct omap_mbox *mbox, mbox_msg_t msg);
|
|
int (*fifo_empty)(struct omap_mbox *mbox);
|
|
int (*fifo_full)(struct omap_mbox *mbox);
|
|
/* irq */
|
|
void (*enable_irq)(struct omap_mbox *mbox,
|
|
omap_mbox_irq_t irq);
|
|
void (*disable_irq)(struct omap_mbox *mbox,
|
|
omap_mbox_irq_t irq);
|
|
void (*ack_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
|
|
int (*is_irq)(struct omap_mbox *mbox, omap_mbox_irq_t irq);
|
|
/* ctx */
|
|
void (*save_ctx)(struct omap_mbox *mbox);
|
|
void (*restore_ctx)(struct omap_mbox *mbox);
|
|
};
|
|
|
|
struct omap_mbox_queue {
|
|
spinlock_t lock;
|
|
struct kfifo fifo;
|
|
struct work_struct work;
|
|
struct tasklet_struct tasklet;
|
|
struct omap_mbox *mbox;
|
|
bool full;
|
|
};
|
|
|
|
struct omap_mbox {
|
|
char *name;
|
|
unsigned int irq;
|
|
struct omap_mbox_queue *txq, *rxq;
|
|
struct omap_mbox_ops *ops;
|
|
struct device *dev;
|
|
void *priv;
|
|
int use_count;
|
|
struct blocking_notifier_head notifier;
|
|
};
|
|
|
|
int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
|
|
void omap_mbox_init_seq(struct omap_mbox *);
|
|
|
|
struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
|
|
void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);
|
|
|
|
int omap_mbox_register(struct device *parent, struct omap_mbox **);
|
|
int omap_mbox_unregister(void);
|
|
|
|
static inline void omap_mbox_save_ctx(struct omap_mbox *mbox)
|
|
{
|
|
if (!mbox->ops->save_ctx) {
|
|
dev_err(mbox->dev, "%s:\tno save\n", __func__);
|
|
return;
|
|
}
|
|
|
|
mbox->ops->save_ctx(mbox);
|
|
}
|
|
|
|
static inline void omap_mbox_restore_ctx(struct omap_mbox *mbox)
|
|
{
|
|
if (!mbox->ops->restore_ctx) {
|
|
dev_err(mbox->dev, "%s:\tno restore\n", __func__);
|
|
return;
|
|
}
|
|
|
|
mbox->ops->restore_ctx(mbox);
|
|
}
|
|
|
|
static inline void omap_mbox_enable_irq(struct omap_mbox *mbox,
|
|
omap_mbox_irq_t irq)
|
|
{
|
|
mbox->ops->enable_irq(mbox, irq);
|
|
}
|
|
|
|
static inline void omap_mbox_disable_irq(struct omap_mbox *mbox,
|
|
omap_mbox_irq_t irq)
|
|
{
|
|
mbox->ops->disable_irq(mbox, irq);
|
|
}
|
|
|
|
#endif /* MAILBOX_H */
|