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firmware: arm_ffa: Implement the FFA_RUN interface

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FFA_RUN is used by a scheduler to allocate CPU cycles to a target
endpoint execution context specified in the target information parameter.

If the endpoint execution context is in the waiting/blocked state, it
transitions to the running state.

Expose the ability to call FFA_RUN in order to give any partition in the
system cpu cycles to perform IMPDEF functionality.

Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-4-cddd3237809c@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Sudeep Holla 2023-10-05 15:44:57 +01:00
parent 933db703e8
commit fe2ddb6b42
2 changed files with 27 additions and 0 deletions
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22
drivers/firmware/arm_ffa/driver.c
View File

@ -616,6 +616,23 @@ static int ffa_notification_bind_common(u16 dst_id, u64 bitmap,
return 0;
}
static int ffa_run(struct ffa_device *dev, u16 vcpu)
{
ffa_value_t ret;
u32 target = dev->vm_id << 16 | vcpu;
invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret);
while (ret.a0 == FFA_INTERRUPT)
invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, },
&ret);
if (ret.a0 == FFA_ERROR)
return ffa_to_linux_errno((int)ret.a2);
return 0;
}
static void ffa_set_up_mem_ops_native_flag(void)
{
if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
@ -700,10 +717,15 @@ static const struct ffa_mem_ops ffa_drv_mem_ops = {
.memory_lend = ffa_memory_lend,
};
static const struct ffa_cpu_ops ffa_drv_cpu_ops = {
.run = ffa_run,
};
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,
};
void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)

5
include/linux/arm_ffa.h
View File

@ -387,10 +387,15 @@ struct ffa_mem_ops {
int (*memory_lend)(struct ffa_mem_ops_args *args);
};
struct ffa_cpu_ops {
int (*run)(struct ffa_device *dev, u16 vcpu);
};
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;
};
#endif /* _LINUX_ARM_FFA_H */