diff options
| author | Sudeep Holla <sudeep.holla@arm.com> | 2023-10-05 17:44:57 +0300 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2023-10-06 17:33:13 +0300 |
| commit | fe2ddb6b42358ad25a6aed30512fb284522335f3 (patch) | |
| tree | 43b1f181729268ad1b4644218c72b83fb2352c4a /drivers/firmware/arm_ffa | |
| parent | 933db703e8ce3e30bb9f282afe73f7316338036b (diff) | |
| download | linux-fe2ddb6b42358ad25a6aed30512fb284522335f3.tar.xz | |
firmware: arm_ffa: Implement the FFA_RUN interface
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>
Diffstat (limited to 'drivers/firmware/arm_ffa')
| -rw-r--r-- | drivers/firmware/arm_ffa/driver.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index 20f8f4ca8e89..82e54d231074 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -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) |