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firmware: arm_ffa: Add schedule receiver callback mechanism

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Enable client drivers to register a callback function that will be
called when one or more notifications are pending for a target
partition as part of schedule receiver interrupt handling.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-9-cddd3237809c@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2023-10-05 15:45:02 +01:00
parent 897e9e60c0
commit 0184450b8b
2 changed files with 108 additions and 3 deletions
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103
drivers/firmware/arm_ffa/driver.c
View file

@ -37,6 +37,7 @@
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/uuid.h>
#include <linux/xarray.h>
#include "common.h"
@ -99,6 +100,8 @@ struct ffa_drv_info {
struct ffa_pcpu_irq __percpu *irq_pcpu;
struct workqueue_struct *notif_pcpu_wq;
struct work_struct irq_work;
struct xarray partition_info;
unsigned int partition_count;
};
static struct ffa_drv_info *drv_info;
@ -694,9 +697,26 @@ static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify)
return 0;
}
static void __do_sched_recv_cb(u16 partition_id, u16 vcpu, bool is_per_vcpu)
struct ffa_dev_part_info {
ffa_sched_recv_cb callback;
void *cb_data;
rwlock_t rw_lock;
};
static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu)
{
pr_err("Callback for partition 0x%x failed.\n", partition_id);
struct ffa_dev_part_info *partition;
ffa_sched_recv_cb callback;
void *cb_data;
partition = xa_load(&drv_info->partition_info, part_id);
read_lock(&partition->rw_lock);
callback = partition->callback;
cb_data = partition->cb_data;
read_unlock(&partition->rw_lock);
if (callback)
callback(vcpu, is_per_vcpu, cb_data);
}
static void ffa_notification_info_get(void)
@ -845,6 +865,39 @@ static int ffa_memory_lend(struct ffa_mem_ops_args *args)
return ffa_memory_ops(FFA_MEM_LEND, args);
}
static int ffa_sched_recv_cb_update(u16 part_id, ffa_sched_recv_cb callback,
void *cb_data, bool is_registration)
{
struct ffa_dev_part_info *partition;
bool cb_valid;
partition = xa_load(&drv_info->partition_info, part_id);
write_lock(&partition->rw_lock);
cb_valid = !!partition->callback;
if (!(is_registration ^ cb_valid)) {
write_unlock(&partition->rw_lock);
return -EINVAL;
}
partition->callback = callback;
partition->cb_data = cb_data;
write_unlock(&partition->rw_lock);
return 0;
}
static int ffa_sched_recv_cb_register(struct ffa_device *dev,
ffa_sched_recv_cb cb, void *cb_data)
{
return ffa_sched_recv_cb_update(dev->vm_id, cb, cb_data, true);
}
static int ffa_sched_recv_cb_unregister(struct ffa_device *dev)
{
return ffa_sched_recv_cb_update(dev->vm_id, NULL, NULL, false);
}
static const struct ffa_info_ops ffa_drv_info_ops = {
.api_version_get = ffa_api_version_get,
.partition_info_get = ffa_partition_info_get,
@ -865,11 +918,17 @@ static const struct ffa_cpu_ops ffa_drv_cpu_ops = {
.run = ffa_run,
};
static const struct ffa_notifier_ops ffa_drv_notifier_ops = {
.sched_recv_cb_register = ffa_sched_recv_cb_register,
.sched_recv_cb_unregister = ffa_sched_recv_cb_unregister,
};
static const struct ffa_ops ffa_drv_ops = {
.info_ops = &ffa_drv_info_ops,
.msg_ops = &ffa_drv_msg_ops,
.mem_ops = &ffa_drv_mem_ops,
.cpu_ops = &ffa_drv_cpu_ops,
.notifier_ops = &ffa_drv_notifier_ops,
};
void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
@ -900,6 +959,7 @@ static void ffa_setup_partitions(void)
int count, idx;
uuid_t uuid;
struct ffa_device *ffa_dev;
struct ffa_dev_part_info *info;
struct ffa_partition_info *pbuf, *tpbuf;
count = ffa_partition_probe(&uuid_null, &pbuf);
@ -908,6 +968,7 @@ static void ffa_setup_partitions(void)
return;
}
xa_init(&drv_info->partition_info);
for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
import_uuid(&uuid, (u8 *)tpbuf->uuid);
@ -927,10 +988,42 @@ static void ffa_setup_partitions(void)
if (drv_info->version > FFA_VERSION_1_0 &&
!(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
ffa_mode_32bit_set(ffa_dev);
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
ffa_device_unregister(ffa_dev);
continue;
}
xa_store(&drv_info->partition_info, tpbuf->id, info, GFP_KERNEL);
}
drv_info->partition_count = count;
kfree(pbuf);
}
static void ffa_partitions_cleanup(void)
{
struct ffa_dev_part_info **info;
int idx, count = drv_info->partition_count;
if (!count)
return;
info = kcalloc(count, sizeof(**info), GFP_KERNEL);
if (!info)
return;
xa_extract(&drv_info->partition_info, (void **)info, 0, VM_ID_MASK,
count, XA_PRESENT);
for (idx = 0; idx < count; idx++)
kfree(info[idx]);
kfree(info);
drv_info->partition_count = 0;
xa_destroy(&drv_info->partition_info);
}
/* FFA FEATURE IDs */
#define FFA_FEAT_NOTIFICATION_PENDING_INT (1)
#define FFA_FEAT_SCHEDULE_RECEIVER_INT (2)
@ -1164,9 +1257,11 @@ static int __init ffa_init(void)
ret = ffa_notifications_setup();
if (ret)
goto free_pages;
goto partitions_cleanup;
return 0;
partitions_cleanup:
ffa_partitions_cleanup();
free_pages:
if (drv_info->tx_buffer)
free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
@ -1182,9 +1277,11 @@ subsys_initcall(ffa_init);
static void __exit ffa_exit(void)
{
ffa_notifications_cleanup();
ffa_partitions_cleanup();
ffa_rxtx_unmap(drv_info->vm_id);
free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
xa_destroy(&drv_info->partition_info);
kfree(drv_info);
arm_ffa_bus_exit();
}

8
include/linux/arm_ffa.h
View file

@ -391,11 +391,19 @@ struct ffa_cpu_ops {
int (*run)(struct ffa_device *dev, u16 vcpu);
};
typedef void (*ffa_sched_recv_cb)(u16 vcpu, bool is_per_vcpu, void *cb_data);
struct ffa_notifier_ops {
int (*sched_recv_cb_register)(struct ffa_device *dev,
ffa_sched_recv_cb cb, void *cb_data);
int (*sched_recv_cb_unregister)(struct ffa_device *dev);
};
struct ffa_ops {
const struct ffa_info_ops *info_ops;
const struct ffa_msg_ops *msg_ops;
const struct ffa_mem_ops *mem_ops;
const struct ffa_cpu_ops *cpu_ops;
const struct ffa_notifier_ops *notifier_ops;
};
#endif /* _LINUX_ARM_FFA_H */