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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/kernel/ipc.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2013,2018 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
#include <arch/ppc.H>
#include <kernel/ipc.H>
#include <kernel/cpu.H>
#include <kernel/intmsghandler.H>
#include <kernel/console.H>
#include <errno.h>
#include <kernel/doorbell.H>
using namespace KernelIpc;
namespace KernelIpc
{
int send(uint64_t i_q, msg_t * i_msg);
};
/**
* IPC communication area. Interrupt service provider initializes.
* @see intrrp.C
*/
KernelIpc::ipc_data_area_t KernelIpc::ipc_data_area;
// Put the IPC message in the other nodes memory space
// Two potential issues:
// 1. The destination node is not there - memory location is nonexistant.
// 2. The destination node never responds, potentially hanging this thread.
int KernelIpc::send(uint64_t i_q, msg_t * i_msg)
{
// @note
// Point to memory in the destination image.
// All host boot images are assured to be at the same code level.
// PIR node and physical node are not always the same. For instance a
// single node system with an alt-master could be designed such that the
// alt-master were on a different logical (power bus numbering) node.
// Since it's not in plan to use this IPC mechanism in a single node
// system, this case will get ignored for now.
uint64_t this_node = getPIR()/KERNEL_MAX_SUPPORTED_CPUS_PER_NODE;
uint64_t hrmor_offset = getHRMOR()-(this_node*(ipc_data_area.hrmor_base));
uint64_t dest_node = (i_q >> 32) & 0x07;
uint64_t dest_hrmor = (ipc_data_area.hrmor_base*dest_node) + hrmor_offset;
uint64_t dest_addr = reinterpret_cast<uint64_t>(&ipc_data_area);
dest_addr += dest_hrmor;
dest_addr |= 0x8000000000000000ul;
printkd("IPC Dest addr %lx Q_id:%lx\n",dest_addr,i_q);
// pointer to the ipc_data_area in the destination node
ipc_data_area_t * p_dest =
reinterpret_cast<ipc_data_area_t*>(dest_addr);
// get lock on IPC data area in other node
if(false == __sync_bool_compare_and_swap(&(p_dest->msg_queue_id),
IPC_DATA_AREA_CLEAR,
IPC_DATA_AREA_LOCKED))
{
return -EAGAIN;
}
p_dest->msg_payload = *i_msg; // copy in message
lwsync();
p_dest->msg_queue_id = i_q; // set destination queue id
lwsync();
printk("IPC to PIR %x\n",p_dest->pir);
// send doorbell to interrupt the other drawer
send_doorbell_ipc(p_dest->pir);
// The message allocation is freed here to make msg_send for IPC
// messages behave the same as non-IPC msg_send; that is, the message
// is freed by the consumer; however, i_msg was allocated in user space
// code and freed here in kernel space. The assumption is that this is OK.
msg_free(i_msg);
return 0;
}
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