235 строки
6.6 KiB
C
235 строки
6.6 KiB
C
/**********************************************************************
|
|
* Author: Cavium, Inc.
|
|
*
|
|
* Contact: support@cavium.com
|
|
* Please include "LiquidIO" in the subject.
|
|
*
|
|
* Copyright (c) 2003-2016 Cavium, Inc.
|
|
*
|
|
* This file is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, Version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This file is distributed in the hope that it will be useful, but
|
|
* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
|
|
* NONINFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
**********************************************************************/
|
|
#include <linux/pci.h>
|
|
#include <linux/netdevice.h>
|
|
#include "liquidio_common.h"
|
|
#include "octeon_droq.h"
|
|
#include "octeon_iq.h"
|
|
#include "response_manager.h"
|
|
#include "octeon_device.h"
|
|
#include "octeon_main.h"
|
|
|
|
static void oct_poll_req_completion(struct work_struct *work);
|
|
|
|
int octeon_setup_response_list(struct octeon_device *oct)
|
|
{
|
|
int i, ret = 0;
|
|
struct cavium_wq *cwq;
|
|
|
|
for (i = 0; i < MAX_RESPONSE_LISTS; i++) {
|
|
INIT_LIST_HEAD(&oct->response_list[i].head);
|
|
spin_lock_init(&oct->response_list[i].lock);
|
|
atomic_set(&oct->response_list[i].pending_req_count, 0);
|
|
}
|
|
spin_lock_init(&oct->cmd_resp_wqlock);
|
|
|
|
oct->dma_comp_wq.wq = alloc_workqueue("dma-comp", WQ_MEM_RECLAIM, 0);
|
|
if (!oct->dma_comp_wq.wq) {
|
|
dev_err(&oct->pci_dev->dev, "failed to create wq thread\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cwq = &oct->dma_comp_wq;
|
|
INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion);
|
|
cwq->wk.ctxptr = oct;
|
|
oct->cmd_resp_state = OCT_DRV_ONLINE;
|
|
|
|
return ret;
|
|
}
|
|
|
|
void octeon_delete_response_list(struct octeon_device *oct)
|
|
{
|
|
cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work);
|
|
destroy_workqueue(oct->dma_comp_wq.wq);
|
|
}
|
|
|
|
int lio_process_ordered_list(struct octeon_device *octeon_dev,
|
|
u32 force_quit)
|
|
{
|
|
struct octeon_response_list *ordered_sc_list;
|
|
struct octeon_soft_command *sc;
|
|
int request_complete = 0;
|
|
int resp_to_process = MAX_ORD_REQS_TO_PROCESS;
|
|
u32 status;
|
|
u64 status64;
|
|
|
|
octeon_free_sc_done_list(octeon_dev);
|
|
|
|
ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST];
|
|
|
|
do {
|
|
spin_lock_bh(&ordered_sc_list->lock);
|
|
|
|
if (list_empty(&ordered_sc_list->head)) {
|
|
spin_unlock_bh(&ordered_sc_list->lock);
|
|
return 1;
|
|
}
|
|
|
|
sc = list_first_entry(&ordered_sc_list->head,
|
|
struct octeon_soft_command, node);
|
|
|
|
status = OCTEON_REQUEST_PENDING;
|
|
|
|
/* check if octeon has finished DMA'ing a response
|
|
* to where rptr is pointing to
|
|
*/
|
|
status64 = *sc->status_word;
|
|
|
|
if (status64 != COMPLETION_WORD_INIT) {
|
|
/* This logic ensures that all 64b have been written.
|
|
* 1. check byte 0 for non-FF
|
|
* 2. if non-FF, then swap result from BE to host order
|
|
* 3. check byte 7 (swapped to 0) for non-FF
|
|
* 4. if non-FF, use the low 32-bit status code
|
|
* 5. if either byte 0 or byte 7 is FF, don't use status
|
|
*/
|
|
if ((status64 & 0xff) != 0xff) {
|
|
octeon_swap_8B_data(&status64, 1);
|
|
if (((status64 & 0xff) != 0xff)) {
|
|
/* retrieve 16-bit firmware status */
|
|
status = (u32)(status64 & 0xffffULL);
|
|
if (status) {
|
|
status =
|
|
FIRMWARE_STATUS_CODE(status);
|
|
} else {
|
|
/* i.e. no error */
|
|
status = OCTEON_REQUEST_DONE;
|
|
}
|
|
}
|
|
}
|
|
} else if (unlikely(force_quit) || (sc->expiry_time &&
|
|
time_after(jiffies, (unsigned long)sc->expiry_time))) {
|
|
struct octeon_instr_irh *irh =
|
|
(struct octeon_instr_irh *)&sc->cmd.cmd3.irh;
|
|
|
|
dev_err(&octeon_dev->pci_dev->dev, "%s: ", __func__);
|
|
dev_err(&octeon_dev->pci_dev->dev,
|
|
"cmd %x/%x/%llx/%llx failed, ",
|
|
irh->opcode, irh->subcode,
|
|
sc->cmd.cmd3.ossp[0], sc->cmd.cmd3.ossp[1]);
|
|
dev_err(&octeon_dev->pci_dev->dev,
|
|
"timeout (%ld, %ld)\n",
|
|
(long)jiffies, (long)sc->expiry_time);
|
|
status = OCTEON_REQUEST_TIMEOUT;
|
|
}
|
|
|
|
if (status != OCTEON_REQUEST_PENDING) {
|
|
sc->sc_status = status;
|
|
|
|
/* we have received a response or we have timed out */
|
|
/* remove node from linked list */
|
|
list_del(&sc->node);
|
|
atomic_dec(&octeon_dev->response_list
|
|
[OCTEON_ORDERED_SC_LIST].
|
|
pending_req_count);
|
|
|
|
if (!sc->callback) {
|
|
atomic_inc(&octeon_dev->response_list
|
|
[OCTEON_DONE_SC_LIST].
|
|
pending_req_count);
|
|
list_add_tail(&sc->node,
|
|
&octeon_dev->response_list
|
|
[OCTEON_DONE_SC_LIST].head);
|
|
|
|
if (unlikely(READ_ONCE(sc->caller_is_done))) {
|
|
/* caller does not wait for response
|
|
* from firmware
|
|
*/
|
|
if (status != OCTEON_REQUEST_DONE) {
|
|
struct octeon_instr_irh *irh;
|
|
|
|
irh =
|
|
(struct octeon_instr_irh *)
|
|
&sc->cmd.cmd3.irh;
|
|
dev_dbg
|
|
(&octeon_dev->pci_dev->dev,
|
|
"%s: sc failed: opcode=%x, ",
|
|
__func__, irh->opcode);
|
|
dev_dbg
|
|
(&octeon_dev->pci_dev->dev,
|
|
"subcode=%x, ossp[0]=%llx, ",
|
|
irh->subcode,
|
|
sc->cmd.cmd3.ossp[0]);
|
|
dev_dbg
|
|
(&octeon_dev->pci_dev->dev,
|
|
"ossp[1]=%llx, status=%d\n",
|
|
sc->cmd.cmd3.ossp[1],
|
|
status);
|
|
}
|
|
} else {
|
|
complete(&sc->complete);
|
|
}
|
|
|
|
spin_unlock_bh(&ordered_sc_list->lock);
|
|
} else {
|
|
/* sc with callback function */
|
|
if (status == OCTEON_REQUEST_TIMEOUT) {
|
|
atomic_inc(&octeon_dev->response_list
|
|
[OCTEON_ZOMBIE_SC_LIST].
|
|
pending_req_count);
|
|
list_add_tail(&sc->node,
|
|
&octeon_dev->response_list
|
|
[OCTEON_ZOMBIE_SC_LIST].
|
|
head);
|
|
}
|
|
|
|
spin_unlock_bh(&ordered_sc_list->lock);
|
|
|
|
sc->callback(octeon_dev, status,
|
|
sc->callback_arg);
|
|
/* sc is freed by caller */
|
|
}
|
|
|
|
request_complete++;
|
|
|
|
} else {
|
|
/* no response yet */
|
|
request_complete = 0;
|
|
spin_unlock_bh
|
|
(&ordered_sc_list->lock);
|
|
}
|
|
|
|
/* If we hit the Max Ordered requests to process every loop,
|
|
* we quit
|
|
* and let this function be invoked the next time the poll
|
|
* thread runs
|
|
* to process the remaining requests. This function can take up
|
|
* the entire CPU if there is no upper limit to the requests
|
|
* processed.
|
|
*/
|
|
if (request_complete >= resp_to_process)
|
|
break;
|
|
} while (request_complete);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void oct_poll_req_completion(struct work_struct *work)
|
|
{
|
|
struct cavium_wk *wk = (struct cavium_wk *)work;
|
|
struct octeon_device *oct = (struct octeon_device *)wk->ctxptr;
|
|
struct cavium_wq *cwq = &oct->dma_comp_wq;
|
|
|
|
lio_process_ordered_list(oct, 0);
|
|
|
|
if (atomic_read(&oct->response_list
|
|
[OCTEON_ORDERED_SC_LIST].pending_req_count))
|
|
queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(1));
|
|
}
|