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coral / linux-mtk / 40b033ab93b226e7e640c5ad11b05310c0f29cb7 / . / drivers / net / wireless / ath / ath6kl / htc_mbox.c
blob: 65c31da43c4738de6a58a840c7e858fc5844b8f0 [file] [log] [blame]
/*
* Copyright (c) 2007-2011 Atheros Communications Inc.
* Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "core.h"
#include "hif.h"
#include "debug.h"
#include "hif-ops.h"
#include "trace.h"
#include <asm/unaligned.h>
#define CALC_TXRX_PADDED_LEN(dev, len) (__ALIGN_MASK((len), (dev)->block_mask))
static void ath6kl_htc_mbox_cleanup(struct htc_target *target);
static void ath6kl_htc_mbox_stop(struct htc_target *target);
static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target,
struct list_head *pkt_queue);
static void ath6kl_htc_set_credit_dist(struct htc_target *target,
struct ath6kl_htc_credit_info *cred_info,
u16 svc_pri_order[], int len);
/* threshold to re-enable Tx bundling for an AC*/
#define TX_RESUME_BUNDLE_THRESHOLD 1500
/* Functions for Tx credit handling */
static void ath6kl_credit_deposit(struct ath6kl_htc_credit_info *cred_info,
struct htc_endpoint_credit_dist *ep_dist,
int credits)
{
ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit deposit ep %d credits %d\n",
ep_dist->endpoint, credits);
ep_dist->credits += credits;
ep_dist->cred_assngd += credits;
cred_info->cur_free_credits -= credits;
}
static void ath6kl_credit_init(struct ath6kl_htc_credit_info *cred_info,
struct list_head *ep_list,
int tot_credits)
{
struct htc_endpoint_credit_dist *cur_ep_dist;
int count;
ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit init total %d\n", tot_credits);
cred_info->cur_free_credits = tot_credits;
cred_info->total_avail_credits = tot_credits;
list_for_each_entry(cur_ep_dist, ep_list, list) {
if (cur_ep_dist->endpoint == ENDPOINT_0)
continue;
cur_ep_dist->cred_min = cur_ep_dist->cred_per_msg;
if (tot_credits > 4) {
if ((cur_ep_dist->svc_id == WMI_DATA_BK_SVC) ||
(cur_ep_dist->svc_id == WMI_DATA_BE_SVC)) {
ath6kl_credit_deposit(cred_info,
cur_ep_dist,
cur_ep_dist->cred_min);
cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
}
}
if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) {
ath6kl_credit_deposit(cred_info, cur_ep_dist,
cur_ep_dist->cred_min);
/*
* Control service is always marked active, it
* never goes inactive EVER.
*/
cur_ep_dist->dist_flags |= HTC_EP_ACTIVE;
}
/*
* Streams have to be created (explicit | implicit) for all
* kinds of traffic. BE endpoints are also inactive in the
* beginning. When BE traffic starts it creates implicit
* streams that redistributes credits.
*
* Note: all other endpoints have minimums set but are
* initially given NO credits. credits will be distributed
* as traffic activity demands
*/
}
/*
* For ath6kl_credit_seek function,
* it use list_for_each_entry_reverse to walk around the whole ep list.
* Therefore assign this lowestpri_ep_dist after walk around the ep_list
*/
cred_info->lowestpri_ep_dist = cur_ep_dist->list;
WARN_ON(cred_info->cur_free_credits <= 0);
list_for_each_entry(cur_ep_dist, ep_list, list) {
if (cur_ep_dist->endpoint == ENDPOINT_0)
continue;
if (cur_ep_dist->svc_id == WMI_CONTROL_SVC) {
cur_ep_dist->cred_norm = cur_ep_dist->cred_per_msg;
} else {
/*
* For the remaining data endpoints, we assume that
* each cred_per_msg are the same. We use a simple
* calculation here, we take the remaining credits
* and determine how many max messages this can
* cover and then set each endpoint's normal value
* equal to 3/4 this amount.
*/
count = (cred_info->cur_free_credits /
cur_ep_dist->cred_per_msg)
* cur_ep_dist->cred_per_msg;
count = (count * 3) >> 2;
count = max(count, cur_ep_dist->cred_per_msg);
cur_ep_dist->cred_norm = count;
}
ath6kl_dbg(ATH6KL_DBG_CREDIT,
"credit ep %d svc_id %d credits %d per_msg %d norm %d min %d\n",
cur_ep_dist->endpoint,
cur_ep_dist->svc_id,
cur_ep_dist->credits,
cur_ep_dist->cred_per_msg,
cur_ep_dist->cred_norm,
cur_ep_dist->cred_min);
}
}
/* initialize and setup credit distribution */
static int ath6kl_htc_mbox_credit_setup(struct htc_target *htc_target,
struct ath6kl_htc_credit_info *cred_info)
{
u16 servicepriority[5];
memset(cred_info, 0, sizeof(struct ath6kl_htc_credit_info));
servicepriority[0] = WMI_CONTROL_SVC; /* highest */
servicepriority[1] = WMI_DATA_VO_SVC;
servicepriority[2] = WMI_DATA_VI_SVC;
servicepriority[3] = WMI_DATA_BE_SVC;
servicepriority[4] = WMI_DATA_BK_SVC; /* lowest */
/* set priority list */
ath6kl_htc_set_credit_dist(htc_target, cred_info, servicepriority, 5);
return 0;
}
/* reduce an ep's credits back to a set limit */
static void ath6kl_credit_reduce(struct ath6kl_htc_credit_info *cred_info,
struct htc_endpoint_credit_dist *ep_dist,
int limit)
{
int credits;
ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit reduce ep %d limit %d\n",
ep_dist->endpoint, limit);
ep_dist->cred_assngd = limit;
if (ep_dist->credits <= limit)
return;
credits = ep_dist->credits - limit;
ep_dist->credits -= credits;
cred_info->cur_free_credits += credits;
}
static void ath6kl_credit_update(struct ath6kl_htc_credit_info *cred_info,
struct list_head *epdist_list)
{
struct htc_endpoint_credit_dist *cur_list;
list_for_each_entry(cur_list, epdist_list, list) {
if (cur_list->endpoint == ENDPOINT_0)
continue;
if (cur_list->cred_to_dist > 0) {
cur_list->credits += cur_list->cred_to_dist;
cur_list->cred_to_dist = 0;
if (cur_list->credits > cur_list->cred_assngd)
ath6kl_credit_reduce(cred_info,
cur_list,
cur_list->cred_assngd);
if (cur_list->credits > cur_list->cred_norm)
ath6kl_credit_reduce(cred_info, cur_list,
cur_list->cred_norm);
if (!(cur_list->dist_flags & HTC_EP_ACTIVE)) {
if (cur_list->txq_depth == 0)
ath6kl_credit_reduce(cred_info,
cur_list, 0);
}
}
}
}
/*
* HTC has an endpoint that needs credits, ep_dist is the endpoint in
* question.
*/
static void ath6kl_credit_seek(struct ath6kl_htc_credit_info *cred_info,
struct htc_endpoint_credit_dist *ep_dist)
{
struct htc_endpoint_credit_dist *curdist_list;
int credits = 0;
int need;
if (ep_dist->svc_id == WMI_CONTROL_SVC)
goto out;
if ((ep_dist->svc_id == WMI_DATA_VI_SVC) ||
(ep_dist->svc_id == WMI_DATA_VO_SVC))
if ((ep_dist->cred_assngd >= ep_dist->cred_norm))
goto out;
/*
* For all other services, we follow a simple algorithm of:
*
* 1. checking the free pool for credits
* 2. checking lower priority endpoints for credits to take
*/
credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
if (credits >= ep_dist->seek_cred)
goto out;
/*
* We don't have enough in the free pool, try taking away from
* lower priority services The rule for taking away credits:
*
* 1. Only take from lower priority endpoints
* 2. Only take what is allocated above the minimum (never
* starve an endpoint completely)
* 3. Only take what you need.
*/
list_for_each_entry_reverse(curdist_list,
&cred_info->lowestpri_ep_dist,
list) {
if (curdist_list == ep_dist)
break;
need = ep_dist->seek_cred - cred_info->cur_free_credits;
if ((curdist_list->cred_assngd - need) >=
curdist_list->cred_min) {
/*
* The current one has been allocated more than
* it's minimum and it has enough credits assigned
* above it's minimum to fulfill our need try to
* take away just enough to fulfill our need.
*/
ath6kl_credit_reduce(cred_info, curdist_list,
curdist_list->cred_assngd - need);
if (cred_info->cur_free_credits >=
ep_dist->seek_cred)
break;
}
if (curdist_list->endpoint == ENDPOINT_0)
break;
}
credits = min(cred_info->cur_free_credits, ep_dist->seek_cred);
out:
/* did we find some credits? */
if (credits)
ath6kl_credit_deposit(cred_info, ep_dist, credits);
ep_dist->seek_cred = 0;
}
/* redistribute credits based on activity change */
static void ath6kl_credit_redistribute(struct ath6kl_htc_credit_info *info,
struct list_head *ep_dist_list)
{
struct htc_endpoint_credit_dist *curdist_list;
list_for_each_entry(curdist_list, ep_dist_list, list) {
if (curdist_list->endpoint == ENDPOINT_0)
continue;
if ((curdist_list->svc_id == WMI_DATA_BK_SVC) ||
(curdist_list->svc_id == WMI_DATA_BE_SVC))
curdist_list->dist_flags |= HTC_EP_ACTIVE;
if ((curdist_list->svc_id != WMI_CONTROL_SVC) &&
!(curdist_list->dist_flags & HTC_EP_ACTIVE)) {
if (curdist_list->txq_depth == 0)
ath6kl_credit_reduce(info, curdist_list, 0);
else
ath6kl_credit_reduce(info,
curdist_list,
curdist_list->cred_min);
}
}
}
/*
*
* This function is invoked whenever endpoints require credit
* distributions. A lock is held while this function is invoked, this
* function shall NOT block. The ep_dist_list is a list of distribution
* structures in prioritized order as defined by the call to the
* htc_set_credit_dist() api.
*/
static void ath6kl_credit_distribute(struct ath6kl_htc_credit_info *cred_info,
struct list_head *ep_dist_list,
enum htc_credit_dist_reason reason)
{
switch (reason) {
case HTC_CREDIT_DIST_SEND_COMPLETE:
ath6kl_credit_update(cred_info, ep_dist_list);
break;
case HTC_CREDIT_DIST_ACTIVITY_CHANGE:
ath6kl_credit_redistribute(cred_info, ep_dist_list);
break;
default:
break;
}
WARN_ON(cred_info->cur_free_credits > cred_info->total_avail_credits);
WARN_ON(cred_info->cur_free_credits < 0);
}
static void ath6kl_htc_tx_buf_align(u8 **buf, unsigned long len)
{
u8 *align_addr;
if (!IS_ALIGNED((unsigned long) *buf, 4)) {
align_addr = PTR_ALIGN(*buf - 4, 4);
memmove(align_addr, *buf, len);
*buf = align_addr;
}
}
static void ath6kl_htc_tx_prep_pkt(struct htc_packet *packet, u8 flags,
int ctrl0, int ctrl1)
{
struct htc_frame_hdr *hdr;
packet->buf -= HTC_HDR_LENGTH;
hdr = (struct htc_frame_hdr *)packet->buf;
/* Endianess? */
put_unaligned((u16)packet->act_len, &hdr->payld_len);
hdr->flags = flags;
hdr->eid = packet->endpoint;
hdr->ctrl[0] = ctrl0;
hdr->ctrl[1] = ctrl1;
}
static void htc_reclaim_txctrl_buf(struct htc_target *target,
struct htc_packet *pkt)
{
spin_lock_bh(&target->htc_lock);
list_add_tail(&pkt->list, &target->free_ctrl_txbuf);
spin_unlock_bh(&target->htc_lock);
}
static struct htc_packet *htc_get_control_buf(struct htc_target *target,
bool tx)
{
struct htc_packet *packet = NULL;
struct list_head *buf_list;
buf_list = tx ? &target->free_ctrl_txbuf : &target->free_ctrl_rxbuf;
spin_lock_bh(&target->htc_lock);
if (list_empty(buf_list)) {
spin_unlock_bh(&target->htc_lock);
return NULL;
}
packet = list_first_entry(buf_list, struct htc_packet, list);
list_del(&packet->list);
spin_unlock_bh(&target->htc_lock);
if (tx)
packet->buf = packet->buf_start + HTC_HDR_LENGTH;
return packet;
}
static void htc_tx_comp_update(struct htc_target *target,
struct htc_endpoint *endpoint,
struct htc_packet *packet)
{
packet->completion = NULL;
packet->buf += HTC_HDR_LENGTH;
if (!packet->status)
return;
ath6kl_err("req failed (status:%d, ep:%d, len:%d creds:%d)\n",
packet->status, packet->endpoint, packet->act_len,
packet->info.tx.cred_used);
/* on failure to submit, reclaim credits for this packet */
spin_lock_bh(&target->tx_lock);
endpoint->cred_dist.cred_to_dist +=
packet->info.tx.cred_used;
endpoint->cred_dist.txq_depth = get_queue_depth(&endpoint->txq);
ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx ctxt 0x%p dist 0x%p\n",
target->credit_info, &target->cred_dist_list);
ath6kl_credit_distribute(target->credit_info,
&target->cred_dist_list,
HTC_CREDIT_DIST_SEND_COMPLETE);
spin_unlock_bh(&target->tx_lock);
}
static void htc_tx_complete(struct htc_endpoint *endpoint,
struct list_head *txq)
{
if (list_empty(txq))
return;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx complete ep %d pkts %d\n",
endpoint->eid, get_queue_depth(txq));
ath6kl_tx_complete(endpoint->target, txq);
}
static void htc_tx_comp_handler(struct htc_target *target,
struct htc_packet *packet)
{
struct htc_endpoint *endpoint = &target->endpoint[packet->endpoint];
struct list_head container;
ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx complete seqno %d\n",
packet->info.tx.seqno);
htc_tx_comp_update(target, endpoint, packet);
INIT_LIST_HEAD(&container);
list_add_tail(&packet->list, &container);
/* do completion */
htc_tx_complete(endpoint, &container);
}
static void htc_async_tx_scat_complete(struct htc_target *target,
struct hif_scatter_req *scat_req)
{
struct htc_endpoint *endpoint;
struct htc_packet *packet;
struct list_head tx_compq;
int i;
INIT_LIST_HEAD(&tx_compq);
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx scat complete len %d entries %d\n",
scat_req->len, scat_req->scat_entries);
if (scat_req->status)
ath6kl_err("send scatter req failed: %d\n", scat_req->status);
packet = scat_req->scat_list[0].packet;
endpoint = &target->endpoint[packet->endpoint];
/* walk through the scatter list and process */
for (i = 0; i < scat_req->scat_entries; i++) {
packet = scat_req->scat_list[i].packet;
if (!packet) {
WARN_ON(1);
return;
}
packet->status = scat_req->status;
htc_tx_comp_update(target, endpoint, packet);
list_add_tail(&packet->list, &tx_compq);
}
/* free scatter request */
hif_scatter_req_add(target->dev->ar, scat_req);
/* complete all packets */
htc_tx_complete(endpoint, &tx_compq);
}
static int ath6kl_htc_tx_issue(struct htc_target *target,
struct htc_packet *packet)
{
int status;
bool sync = false;
u32 padded_len, send_len;
if (!packet->completion)
sync = true;
send_len = packet->act_len + HTC_HDR_LENGTH;
padded_len = CALC_TXRX_PADDED_LEN(target, send_len);
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx issue len %d seqno %d padded_len %d mbox 0x%X %s\n",
send_len, packet->info.tx.seqno, padded_len,
target->dev->ar->mbox_info.htc_addr,
sync ? "sync" : "async");
if (sync) {
status = hif_read_write_sync(target->dev->ar,
target->dev->ar->mbox_info.htc_addr,
packet->buf, padded_len,
HIF_WR_SYNC_BLOCK_INC);
packet->status = status;
packet->buf += HTC_HDR_LENGTH;
} else
status = hif_write_async(target->dev->ar,
target->dev->ar->mbox_info.htc_addr,
packet->buf, padded_len,
HIF_WR_ASYNC_BLOCK_INC, packet);
trace_ath6kl_htc_tx(status, packet->endpoint, packet->buf, send_len);
return status;
}
static int htc_check_credits(struct htc_target *target,
struct htc_endpoint *ep, u8 *flags,
enum htc_endpoint_id eid, unsigned int len,
int *req_cred)
{
*req_cred = (len > target->tgt_cred_sz) ?
DIV_ROUND_UP(len, target->tgt_cred_sz) : 1;
ath6kl_dbg(ATH6KL_DBG_CREDIT, "credit check need %d got %d\n",
*req_cred, ep->cred_dist.credits);
if (ep->cred_dist.credits < *req_cred) {
if (eid == ENDPOINT_0)
return -EINVAL;
/* Seek more credits */
ep->cred_dist.seek_cred = *req_cred - ep->cred_dist.credits;
ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
ep->cred_dist.seek_cred = 0;
if (ep->cred_dist.credits < *req_cred) {
ath6kl_dbg(ATH6KL_DBG_CREDIT,
"credit not found for ep %d\n",
eid);
return -EINVAL;
}
}
ep->cred_dist.credits -= *req_cred;
ep->ep_st.cred_cosumd += *req_cred;
/* When we are getting low on credits, ask for more */
if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
ep->cred_dist.seek_cred =
ep->cred_dist.cred_per_msg - ep->cred_dist.credits;
ath6kl_credit_seek(target->credit_info, &ep->cred_dist);
/* see if we were successful in getting more */
if (ep->cred_dist.credits < ep->cred_dist.cred_per_msg) {
/* tell the target we need credits ASAP! */
*flags |= HTC_FLAGS_NEED_CREDIT_UPDATE;
ep->ep_st.cred_low_indicate += 1;
ath6kl_dbg(ATH6KL_DBG_CREDIT,
"credit we need credits asap\n");
}
}
return 0;
}
static void ath6kl_htc_tx_pkts_get(struct htc_target *target,
struct htc_endpoint *endpoint,
struct list_head *queue)
{
int req_cred;
u8 flags;
struct htc_packet *packet;
unsigned int len;
while (true) {
flags = 0;
if (list_empty(&endpoint->txq))
break;
packet = list_first_entry(&endpoint->txq, struct htc_packet,
list);
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx got packet 0x%p queue depth %d\n",
packet, get_queue_depth(&endpoint->txq));
len = CALC_TXRX_PADDED_LEN(target,
packet->act_len + HTC_HDR_LENGTH);
if (htc_check_credits(target, endpoint, &flags,
packet->endpoint, len, &req_cred))
break;
/* now we can fully move onto caller's queue */
packet = list_first_entry(&endpoint->txq, struct htc_packet,
list);
list_move_tail(&packet->list, queue);
/* save the number of credits this packet consumed */
packet->info.tx.cred_used = req_cred;
/* all TX packets are handled asynchronously */
packet->completion = htc_tx_comp_handler;
packet->context = target;
endpoint->ep_st.tx_issued += 1;
/* save send flags */
packet->info.tx.flags = flags;
packet->info.tx.seqno = endpoint->seqno;
endpoint->seqno++;
}
}
/* See if the padded tx length falls on a credit boundary */
static int htc_get_credit_padding(unsigned int cred_sz, int *len,
struct htc_endpoint *ep)
{
int rem_cred, cred_pad;
rem_cred = *len % cred_sz;
/* No padding needed */
if (!rem_cred)
return 0;
if (!(ep->conn_flags & HTC_FLGS_TX_BNDL_PAD_EN))
return -1;
/*
* The transfer consumes a "partial" credit, this
* packet cannot be bundled unless we add
* additional "dummy" padding (max 255 bytes) to
* consume the entire credit.
*/
cred_pad = *len < cred_sz ? (cred_sz - *len) : rem_cred;
if ((cred_pad > 0) && (cred_pad <= 255))
*len += cred_pad;
else
/* The amount of padding is too large, send as non-bundled */
return -1;
return cred_pad;
}
static int ath6kl_htc_tx_setup_scat_list(struct htc_target *target,
struct htc_endpoint *endpoint,
struct hif_scatter_req *scat_req,
int n_scat,
struct list_head *queue)
{
struct htc_packet *packet;
int i, len, rem_scat, cred_pad;
int status = 0;
u8 flags;
rem_scat = target->max_tx_bndl_sz;
for (i = 0; i < n_scat; i++) {
scat_req->scat_list[i].packet = NULL;
if (list_empty(queue))
break;
packet = list_first_entry(queue, struct htc_packet, list);
len = CALC_TXRX_PADDED_LEN(target,
packet->act_len + HTC_HDR_LENGTH);
cred_pad = htc_get_credit_padding(target->tgt_cred_sz,
&len, endpoint);
if (cred_pad < 0 || rem_scat < len) {
status = -ENOSPC;
break;
}
rem_scat -= len;
/* now remove it from the queue */
list_del(&packet->list);
scat_req->scat_list[i].packet = packet;
/* prepare packet and flag message as part of a send bundle */
flags = packet->info.tx.flags | HTC_FLAGS_SEND_BUNDLE;
ath6kl_htc_tx_prep_pkt(packet, flags,
cred_pad, packet->info.tx.seqno);
/* Make sure the buffer is 4-byte aligned */
ath6kl_htc_tx_buf_align(&packet->buf,
packet->act_len + HTC_HDR_LENGTH);
scat_req->scat_list[i].buf = packet->buf;
scat_req->scat_list[i].len = len;
scat_req->len += len;
scat_req->scat_entries++;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx adding (%d) pkt 0x%p seqno %d len %d remaining %d\n",
i, packet, packet->info.tx.seqno, len, rem_scat);
}
/* Roll back scatter setup in case of any failure */
if (scat_req->scat_entries < HTC_MIN_HTC_MSGS_TO_BUNDLE) {
for (i = scat_req->scat_entries - 1; i >= 0; i--) {
packet = scat_req->scat_list[i].packet;
if (packet) {
packet->buf += HTC_HDR_LENGTH;
list_add(&packet->list, queue);
}
}
return -EAGAIN;
}
return status;
}
/*
* Drain a queue and send as bundles this function may return without fully
* draining the queue when
*
* 1. scatter resources are exhausted
* 2. a message that will consume a partial credit will stop the
* bundling process early
* 3. we drop below the minimum number of messages for a bundle
*/
static void ath6kl_htc_tx_bundle(struct htc_endpoint *endpoint,
struct list_head *queue,
int *sent_bundle, int *n_bundle_pkts)
{
struct htc_target *target = endpoint->target;
struct hif_scatter_req *scat_req = NULL;
int n_scat, n_sent_bundle = 0, tot_pkts_bundle = 0, i;
struct htc_packet *packet;
int status;
u32 txb_mask;
u8 ac = WMM_NUM_AC;
if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
(WMI_CONTROL_SVC != endpoint->svc_id))
ac = target->dev->ar->ep2ac_map[endpoint->eid];
while (true) {
status = 0;
n_scat = get_queue_depth(queue);
n_scat = min(n_scat, target->msg_per_bndl_max);
if (n_scat < HTC_MIN_HTC_MSGS_TO_BUNDLE)
/* not enough to bundle */
break;
scat_req = hif_scatter_req_get(target->dev->ar);
if (!scat_req) {
/* no scatter resources */
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx no more scatter resources\n");
break;
}
if ((ac < WMM_NUM_AC) && (ac != WMM_AC_BK)) {
if (WMM_AC_BE == ac)
/*
* BE, BK have priorities and bit
* positions reversed
*/
txb_mask = (1 << WMM_AC_BK);
else
/*
* any AC with priority lower than
* itself
*/
txb_mask = ((1 << ac) - 1);
/*
* when the scatter request resources drop below a
* certain threshold, disable Tx bundling for all
* AC's with priority lower than the current requesting
* AC. Otherwise re-enable Tx bundling for them
*/
if (scat_req->scat_q_depth < ATH6KL_SCATTER_REQS)
target->tx_bndl_mask &= ~txb_mask;
else
target->tx_bndl_mask |= txb_mask;
}
ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx pkts to scatter: %d\n",
n_scat);
scat_req->len = 0;
scat_req->scat_entries = 0;
status = ath6kl_htc_tx_setup_scat_list(target, endpoint,
scat_req, n_scat,
queue);
if (status == -EAGAIN) {
hif_scatter_req_add(target->dev->ar, scat_req);
break;
}
/* send path is always asynchronous */
scat_req->complete = htc_async_tx_scat_complete;
n_sent_bundle++;
tot_pkts_bundle += scat_req->scat_entries;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx scatter bytes %d entries %d\n",
scat_req->len, scat_req->scat_entries);
for (i = 0; i < scat_req->scat_entries; i++) {
packet = scat_req->scat_list[i].packet;
trace_ath6kl_htc_tx(packet->status, packet->endpoint,
packet->buf, packet->act_len);
}
ath6kl_hif_submit_scat_req(target->dev, scat_req, false);
if (status)
break;
}
*sent_bundle = n_sent_bundle;
*n_bundle_pkts = tot_pkts_bundle;
ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx bundle sent %d pkts\n",
n_sent_bundle);
return;
}
static void ath6kl_htc_tx_from_queue(struct htc_target *target,
struct htc_endpoint *endpoint)
{
struct list_head txq;
struct htc_packet *packet;
int bundle_sent;
int n_pkts_bundle;
u8 ac = WMM_NUM_AC;
int status;
spin_lock_bh(&target->tx_lock);
endpoint->tx_proc_cnt++;
if (endpoint->tx_proc_cnt > 1) {
endpoint->tx_proc_cnt--;
spin_unlock_bh(&target->tx_lock);
ath6kl_dbg(ATH6KL_DBG_HTC, "htc tx busy\n");
return;
}
/*
* drain the endpoint TX queue for transmission as long
* as we have enough credits.
*/
INIT_LIST_HEAD(&txq);
if ((HTC_CTRL_RSVD_SVC != endpoint->svc_id) &&
(WMI_CONTROL_SVC != endpoint->svc_id))
ac = target->dev->ar->ep2ac_map[endpoint->eid];
while (true) {
if (list_empty(&endpoint->txq))
break;
ath6kl_htc_tx_pkts_get(target, endpoint, &txq);
if (list_empty(&txq))
break;
spin_unlock_bh(&target->tx_lock);
bundle_sent = 0;
n_pkts_bundle = 0;
while (true) {
/* try to send a bundle on each pass */
if ((target->tx_bndl_mask) &&
(get_queue_depth(&txq) >=
HTC_MIN_HTC_MSGS_TO_BUNDLE)) {
int temp1 = 0, temp2 = 0;
/* check if bundling is enabled for an AC */
if (target->tx_bndl_mask & (1 << ac)) {
ath6kl_htc_tx_bundle(endpoint, &txq,
&temp1, &temp2);
bundle_sent += temp1;
n_pkts_bundle += temp2;
}
}
if (list_empty(&txq))
break;
packet = list_first_entry(&txq, struct htc_packet,
list);
list_del(&packet->list);
ath6kl_htc_tx_prep_pkt(packet, packet->info.tx.flags,
0, packet->info.tx.seqno);
status = ath6kl_htc_tx_issue(target, packet);
if (status) {
packet->status = status;
packet->completion(packet->context, packet);
}
}
spin_lock_bh(&target->tx_lock);
endpoint->ep_st.tx_bundles += bundle_sent;
endpoint->ep_st.tx_pkt_bundled += n_pkts_bundle;
/*
* if an AC has bundling disabled and no tx bundling
* has occured continously for a certain number of TX,
* enable tx bundling for this AC
*/
if (!bundle_sent) {
if (!(target->tx_bndl_mask & (1 << ac)) &&
(ac < WMM_NUM_AC)) {
if (++target->ac_tx_count[ac] >=
TX_RESUME_BUNDLE_THRESHOLD) {
target->ac_tx_count[ac] = 0;
target->tx_bndl_mask |= (1 << ac);
}
}
} else {
/* tx bundling will reset the counter */
if (ac < WMM_NUM_AC)
target->ac_tx_count[ac] = 0;
}
}
endpoint->tx_proc_cnt = 0;
spin_unlock_bh(&target->tx_lock);
}
static bool ath6kl_htc_tx_try(struct htc_target *target,
struct htc_endpoint *endpoint,
struct htc_packet *tx_pkt)
{
struct htc_ep_callbacks ep_cb;
int txq_depth;
bool overflow = false;
ep_cb = endpoint->ep_cb;
spin_lock_bh(&target->tx_lock);
txq_depth = get_queue_depth(&endpoint->txq);
spin_unlock_bh(&target->tx_lock);
if (txq_depth >= endpoint->max_txq_depth)
overflow = true;
if (overflow)
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx overflow ep %d depth %d max %d\n",
endpoint->eid, txq_depth,
endpoint->max_txq_depth);
if (overflow && ep_cb.tx_full) {
if (ep_cb.tx_full(endpoint->target, tx_pkt) ==
HTC_SEND_FULL_DROP) {
endpoint->ep_st.tx_dropped += 1;
return false;
}
}
spin_lock_bh(&target->tx_lock);
list_add_tail(&tx_pkt->list, &endpoint->txq);
spin_unlock_bh(&target->tx_lock);
ath6kl_htc_tx_from_queue(target, endpoint);
return true;
}
static void htc_chk_ep_txq(struct htc_target *target)
{
struct htc_endpoint *endpoint;
struct htc_endpoint_credit_dist *cred_dist;
/*
* Run through the credit distribution list to see if there are
* packets queued. NOTE: no locks need to be taken since the
* distribution list is not dynamic (cannot be re-ordered) and we
* are not modifying any state.
*/
list_for_each_entry(cred_dist, &target->cred_dist_list, list) {
endpoint = cred_dist->htc_ep;
spin_lock_bh(&target->tx_lock);
if (!list_empty(&endpoint->txq)) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc creds ep %d credits %d pkts %d\n",
cred_dist->endpoint,
endpoint->cred_dist.credits,
get_queue_depth(&endpoint->txq));
spin_unlock_bh(&target->tx_lock);
/*
* Try to start the stalled queue, this list is
* ordered by priority. If there are credits
* available the highest priority queue will get a
* chance to reclaim credits from lower priority
* ones.
*/
ath6kl_htc_tx_from_queue(target, endpoint);
spin_lock_bh(&target->tx_lock);
}
spin_unlock_bh(&target->tx_lock);
}
}
static int htc_setup_tx_complete(struct htc_target *target)
{
struct htc_packet *send_pkt = NULL;
int status;
send_pkt = htc_get_control_buf(target, true);
if (!send_pkt)
return -ENOMEM;
if (target->htc_tgt_ver >= HTC_VERSION_2P1) {
struct htc_setup_comp_ext_msg *setup_comp_ext;
u32 flags = 0;
setup_comp_ext =
(struct htc_setup_comp_ext_msg *)send_pkt->buf;
memset(setup_comp_ext, 0, sizeof(*setup_comp_ext));
setup_comp_ext->msg_id =
cpu_to_le16(HTC_MSG_SETUP_COMPLETE_EX_ID);
if (target->msg_per_bndl_max > 0) {
/* Indicate HTC bundling to the target */
flags |= HTC_SETUP_COMP_FLG_RX_BNDL_EN;
setup_comp_ext->msg_per_rxbndl =
target->msg_per_bndl_max;
}
memcpy(&setup_comp_ext->flags, &flags,
sizeof(setup_comp_ext->flags));
set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp_ext,
sizeof(struct htc_setup_comp_ext_msg),
ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
} else {
struct htc_setup_comp_msg *setup_comp;
setup_comp = (struct htc_setup_comp_msg *)send_pkt->buf;
memset(setup_comp, 0, sizeof(struct htc_setup_comp_msg));
setup_comp->msg_id = cpu_to_le16(HTC_MSG_SETUP_COMPLETE_ID);
set_htc_pkt_info(send_pkt, NULL, (u8 *) setup_comp,
sizeof(struct htc_setup_comp_msg),
ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
}
/* we want synchronous operation */
send_pkt->completion = NULL;
ath6kl_htc_tx_prep_pkt(send_pkt, 0, 0, 0);
status = ath6kl_htc_tx_issue(target, send_pkt);
htc_reclaim_txctrl_buf(target, send_pkt);
return status;
}
static void ath6kl_htc_set_credit_dist(struct htc_target *target,
struct ath6kl_htc_credit_info *credit_info,
u16 srvc_pri_order[], int list_len)
{
struct htc_endpoint *endpoint;
int i, ep;
target->credit_info = credit_info;
list_add_tail(&target->endpoint[ENDPOINT_0].cred_dist.list,
&target->cred_dist_list);
for (i = 0; i < list_len; i++) {
for (ep = ENDPOINT_1; ep < ENDPOINT_MAX; ep++) {
endpoint = &target->endpoint[ep];
if (endpoint->svc_id == srvc_pri_order[i]) {
list_add_tail(&endpoint->cred_dist.list,
&target->cred_dist_list);
break;
}
}
if (ep >= ENDPOINT_MAX) {
WARN_ON(1);
return;
}
}
}
static int ath6kl_htc_mbox_tx(struct htc_target *target,
struct htc_packet *packet)
{
struct htc_endpoint *endpoint;
struct list_head queue;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx ep id %d buf 0x%p len %d\n",
packet->endpoint, packet->buf, packet->act_len);
if (packet->endpoint >= ENDPOINT_MAX) {
WARN_ON(1);
return -EINVAL;
}
endpoint = &target->endpoint[packet->endpoint];
if (!ath6kl_htc_tx_try(target, endpoint, packet)) {
packet->status = (target->htc_flags & HTC_OP_STATE_STOPPING) ?
-ECANCELED : -ENOSPC;
INIT_LIST_HEAD(&queue);
list_add(&packet->list, &queue);
htc_tx_complete(endpoint, &queue);
}
return 0;
}
/* flush endpoint TX queue */
static void ath6kl_htc_mbox_flush_txep(struct htc_target *target,
enum htc_endpoint_id eid, u16 tag)
{
struct htc_packet *packet, *tmp_pkt;
struct list_head discard_q, container;
struct htc_endpoint *endpoint = &target->endpoint[eid];
if (!endpoint->svc_id) {
WARN_ON(1);
return;
}
/* initialize the discard queue */
INIT_LIST_HEAD(&discard_q);
spin_lock_bh(&target->tx_lock);
list_for_each_entry_safe(packet, tmp_pkt, &endpoint->txq, list) {
if ((tag == HTC_TX_PACKET_TAG_ALL) ||
(tag == packet->info.tx.tag))
list_move_tail(&packet->list, &discard_q);
}
spin_unlock_bh(&target->tx_lock);
list_for_each_entry_safe(packet, tmp_pkt, &discard_q, list) {
packet->status = -ECANCELED;
list_del(&packet->list);
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx flushing pkt 0x%p len %d ep %d tag 0x%x\n",
packet, packet->act_len,
packet->endpoint, packet->info.tx.tag);
INIT_LIST_HEAD(&container);
list_add_tail(&packet->list, &container);
htc_tx_complete(endpoint, &container);
}
}
static void ath6kl_htc_flush_txep_all(struct htc_target *target)
{
struct htc_endpoint *endpoint;
int i;
dump_cred_dist_stats(target);
for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
endpoint = &target->endpoint[i];
if (endpoint->svc_id == 0)
/* not in use.. */
continue;
ath6kl_htc_mbox_flush_txep(target, i, HTC_TX_PACKET_TAG_ALL);
}
}
static void ath6kl_htc_mbox_activity_changed(struct htc_target *target,
enum htc_endpoint_id eid,
bool active)
{
struct htc_endpoint *endpoint = &target->endpoint[eid];
bool dist = false;
if (endpoint->svc_id == 0) {
WARN_ON(1);
return;
}
spin_lock_bh(&target->tx_lock);
if (active) {
if (!(endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE)) {
endpoint->cred_dist.dist_flags |= HTC_EP_ACTIVE;
dist = true;
}
} else {
if (endpoint->cred_dist.dist_flags & HTC_EP_ACTIVE) {
endpoint->cred_dist.dist_flags &= ~HTC_EP_ACTIVE;
dist = true;
}
}
if (dist) {
endpoint->cred_dist.txq_depth =
get_queue_depth(&endpoint->txq);
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc tx activity ctxt 0x%p dist 0x%p\n",
target->credit_info, &target->cred_dist_list);
ath6kl_credit_distribute(target->credit_info,
&target->cred_dist_list,
HTC_CREDIT_DIST_ACTIVITY_CHANGE);
}
spin_unlock_bh(&target->tx_lock);
if (dist && !active)
htc_chk_ep_txq(target);
}
/* HTC Rx */
static inline void ath6kl_htc_rx_update_stats(struct htc_endpoint *endpoint,
int n_look_ahds)
{
endpoint->ep_st.rx_pkts++;
if (n_look_ahds == 1)
endpoint->ep_st.rx_lkahds++;
else if (n_look_ahds > 1)
endpoint->ep_st.rx_bundle_lkahd++;
}
static inline bool htc_valid_rx_frame_len(struct htc_target *target,
enum htc_endpoint_id eid, int len)
{
return (eid == target->dev->ar->ctrl_ep) ?
len <= ATH6KL_BUFFER_SIZE : len <= ATH6KL_AMSDU_BUFFER_SIZE;
}
static int htc_add_rxbuf(struct htc_target *target, struct htc_packet *packet)
{
struct list_head queue;
INIT_LIST_HEAD(&queue);
list_add_tail(&packet->list, &queue);
return ath6kl_htc_mbox_add_rxbuf_multiple(target, &queue);
}
static void htc_reclaim_rxbuf(struct htc_target *target,
struct htc_packet *packet,
struct htc_endpoint *ep)
{
if (packet->info.rx.rx_flags & HTC_RX_PKT_NO_RECYCLE) {
htc_rxpkt_reset(packet);
packet->status = -ECANCELED;
ep->ep_cb.rx(ep->target, packet);
} else {
htc_rxpkt_reset(packet);
htc_add_rxbuf((void *)(target), packet);
}
}
static void reclaim_rx_ctrl_buf(struct htc_target *target,
struct htc_packet *packet)
{
spin_lock_bh(&target->htc_lock);
list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
spin_unlock_bh(&target->htc_lock);
}
static int ath6kl_htc_rx_packet(struct htc_target *target,
struct htc_packet *packet,
u32 rx_len)
{
struct ath6kl_device *dev = target->dev;
u32 padded_len;
int status;
padded_len = CALC_TXRX_PADDED_LEN(target, rx_len);
if (padded_len > packet->buf_len) {
ath6kl_err("not enough receive space for packet - padlen %d recvlen %d bufferlen %d\n",
padded_len, rx_len, packet->buf_len);
return -ENOMEM;
}
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx 0x%p hdr 0x%x len %d mbox 0x%x\n",
packet, packet->info.rx.exp_hdr,
padded_len, dev->ar->mbox_info.htc_addr);
status = hif_read_write_sync(dev->ar,
dev->ar->mbox_info.htc_addr,
packet->buf, padded_len,
HIF_RD_SYNC_BLOCK_FIX);
packet->status = status;
return status;
}
/*
* optimization for recv packets, we can indicate a
* "hint" that there are more single-packets to fetch
* on this endpoint.
*/
static void ath6kl_htc_rx_set_indicate(u32 lk_ahd,
struct htc_endpoint *endpoint,
struct htc_packet *packet)
{
struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)&lk_ahd;
if (htc_hdr->eid == packet->endpoint) {
if (!list_empty(&endpoint->rx_bufq))
packet->info.rx.indicat_flags |=
HTC_RX_FLAGS_INDICATE_MORE_PKTS;
}
}
static void ath6kl_htc_rx_chk_water_mark(struct htc_endpoint *endpoint)
{
struct htc_ep_callbacks ep_cb = endpoint->ep_cb;
if (ep_cb.rx_refill_thresh > 0) {
spin_lock_bh(&endpoint->target->rx_lock);
if (get_queue_depth(&endpoint->rx_bufq)
< ep_cb.rx_refill_thresh) {
spin_unlock_bh(&endpoint->target->rx_lock);
ep_cb.rx_refill(endpoint->target, endpoint->eid);
return;
}
spin_unlock_bh(&endpoint->target->rx_lock);
}
}
/* This function is called with rx_lock held */
static int ath6kl_htc_rx_setup(struct htc_target *target,
struct htc_endpoint *ep,
u32 *lk_ahds, struct list_head *queue, int n_msg)
{
struct htc_packet *packet;
/* FIXME: type of lk_ahds can't be right */
struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)lk_ahds;
struct htc_ep_callbacks ep_cb;
int status = 0, j, full_len;
bool no_recycle;
full_len = CALC_TXRX_PADDED_LEN(target,
le16_to_cpu(htc_hdr->payld_len) +
sizeof(*htc_hdr));
if (!htc_valid_rx_frame_len(target, ep->eid, full_len)) {
ath6kl_warn("Rx buffer requested with invalid length htc_hdr:eid %d, flags 0x%x, len %d\n",
htc_hdr->eid, htc_hdr->flags,
le16_to_cpu(htc_hdr->payld_len));
return -EINVAL;
}
ep_cb = ep->ep_cb;
for (j = 0; j < n_msg; j++) {
/*
* Reset flag, any packets allocated using the
* rx_alloc() API cannot be recycled on
* cleanup,they must be explicitly returned.
*/
no_recycle = false;
if (ep_cb.rx_allocthresh &&
(full_len > ep_cb.rx_alloc_thresh)) {
ep->ep_st.rx_alloc_thresh_hit += 1;
ep->ep_st.rxalloc_thresh_byte +=
le16_to_cpu(htc_hdr->payld_len);
spin_unlock_bh(&target->rx_lock);
no_recycle = true;
packet = ep_cb.rx_allocthresh(ep->target, ep->eid,
full_len);
spin_lock_bh(&target->rx_lock);
} else {
/* refill handler is being used */
if (list_empty(&ep->rx_bufq)) {
if (ep_cb.rx_refill) {
spin_unlock_bh(&target->rx_lock);
ep_cb.rx_refill(ep->target, ep->eid);
spin_lock_bh(&target->rx_lock);
}
}
if (list_empty(&ep->rx_bufq)) {
packet = NULL;
} else {
packet = list_first_entry(&ep->rx_bufq,
struct htc_packet, list);
list_del(&packet->list);
}
}
if (!packet) {
target->rx_st_flags |= HTC_RECV_WAIT_BUFFERS;
target->ep_waiting = ep->eid;
return -ENOSPC;
}
/* clear flags */
packet->info.rx.rx_flags = 0;
packet->info.rx.indicat_flags = 0;
packet->status = 0;
if (no_recycle)
/*
* flag that these packets cannot be
* recycled, they have to be returned to
* the user
*/
packet->info.rx.rx_flags |= HTC_RX_PKT_NO_RECYCLE;
/* Caller needs to free this upon any failure */
list_add_tail(&packet->list, queue);
if (target->htc_flags & HTC_OP_STATE_STOPPING) {
status = -ECANCELED;
break;
}
if (j) {
packet->info.rx.rx_flags |= HTC_RX_PKT_REFRESH_HDR;
packet->info.rx.exp_hdr = 0xFFFFFFFF;
} else
/* set expected look ahead */
packet->info.rx.exp_hdr = *lk_ahds;
packet->act_len = le16_to_cpu(htc_hdr->payld_len) +
HTC_HDR_LENGTH;
}
return status;
}
static int ath6kl_htc_rx_alloc(struct htc_target *target,
u32 lk_ahds[], int msg,
struct htc_endpoint *endpoint,
struct list_head *queue)
{
int status = 0;
struct htc_packet *packet, *tmp_pkt;
struct htc_frame_hdr *htc_hdr;
int i, n_msg;
spin_lock_bh(&target->rx_lock);
for (i = 0; i < msg; i++) {
htc_hdr = (struct htc_frame_hdr *)&lk_ahds[i];
if (htc_hdr->eid >= ENDPOINT_MAX) {
ath6kl_err("invalid ep in look-ahead: %d\n",
htc_hdr->eid);
status = -ENOMEM;
break;
}
if (htc_hdr->eid != endpoint->eid) {
ath6kl_err("invalid ep in look-ahead: %d should be : %d (index:%d)\n",
htc_hdr->eid, endpoint->eid, i);
status = -ENOMEM;
break;
}
if (le16_to_cpu(htc_hdr->payld_len) > HTC_MAX_PAYLOAD_LENGTH) {
ath6kl_err("payload len %d exceeds max htc : %d !\n",
htc_hdr->payld_len,
(u32) HTC_MAX_PAYLOAD_LENGTH);
status = -ENOMEM;
break;
}
if (endpoint->svc_id == 0) {
ath6kl_err("ep %d is not connected !\n", htc_hdr->eid);
status = -ENOMEM;
break;
}
if (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) {
/*
* HTC header indicates that every packet to follow
* has the same padded length so that it can be
* optimally fetched as a full bundle.
*/
n_msg = (htc_hdr->flags & HTC_FLG_RX_BNDL_CNT) >>
HTC_FLG_RX_BNDL_CNT_S;
/* the count doesn't include the starter frame */
n_msg++;
if (n_msg > target->msg_per_bndl_max) {
status = -ENOMEM;
break;
}
endpoint->ep_st.rx_bundle_from_hdr += 1;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx bundle pkts %d\n",
n_msg);
} else
/* HTC header only indicates 1 message to fetch */
n_msg = 1;
/* Setup packet buffers for each message */
status = ath6kl_htc_rx_setup(target, endpoint, &lk_ahds[i],
queue, n_msg);
/*
* This is due to unavailabilty of buffers to rx entire data.
* Return no error so that free buffers from queue can be used
* to receive partial data.
*/
if (status == -ENOSPC) {
spin_unlock_bh(&target->rx_lock);
return 0;
}
if (status)
break;
}
spin_unlock_bh(&target->rx_lock);
if (status) {
list_for_each_entry_safe(packet, tmp_pkt, queue, list) {
list_del(&packet->list);
htc_reclaim_rxbuf(target, packet,
&target->endpoint[packet->endpoint]);
}
}
return status;
}
static void htc_ctrl_rx(struct htc_target *context, struct htc_packet *packets)
{
if (packets->endpoint != ENDPOINT_0) {
WARN_ON(1);
return;
}
if (packets->status == -ECANCELED) {
reclaim_rx_ctrl_buf(context, packets);
return;
}
if (packets->act_len > 0) {
ath6kl_err("htc_ctrl_rx, got message with len:%zu\n",
packets->act_len + HTC_HDR_LENGTH);
ath6kl_dbg_dump(ATH6KL_DBG_HTC,
"htc rx unexpected endpoint 0 message", "",
packets->buf - HTC_HDR_LENGTH,
packets->act_len + HTC_HDR_LENGTH);
}
htc_reclaim_rxbuf(context, packets, &context->endpoint[0]);
}
static void htc_proc_cred_rpt(struct htc_target *target,
struct htc_credit_report *rpt,
int n_entries,
enum htc_endpoint_id from_ep)
{
struct htc_endpoint *endpoint;
int tot_credits = 0, i;
bool dist = false;
spin_lock_bh(&target->tx_lock);
for (i = 0; i < n_entries; i++, rpt++) {
if (rpt->eid >= ENDPOINT_MAX) {
WARN_ON(1);
spin_unlock_bh(&target->tx_lock);
return;
}
endpoint = &target->endpoint[rpt->eid];
ath6kl_dbg(ATH6KL_DBG_CREDIT,
"credit report ep %d credits %d\n",
rpt->eid, rpt->credits);
endpoint->ep_st.tx_cred_rpt += 1;
endpoint->ep_st.cred_retnd += rpt->credits;
if (from_ep == rpt->eid) {
/*
* This credit report arrived on the same endpoint
* indicating it arrived in an RX packet.
*/
endpoint->ep_st.cred_from_rx += rpt->credits;
endpoint->ep_st.cred_rpt_from_rx += 1;
} else if (from_ep == ENDPOINT_0) {
/* credit arrived on endpoint 0 as a NULL message */
endpoint->ep_st.cred_from_ep0 += rpt->credits;
endpoint->ep_st.cred_rpt_ep0 += 1;
} else {
endpoint->ep_st.cred_from_other += rpt->credits;
endpoint->ep_st.cred_rpt_from_other += 1;
}
if (rpt->eid == ENDPOINT_0)
/* always give endpoint 0 credits back */
endpoint->cred_dist.credits += rpt->credits;
else {
endpoint->cred_dist.cred_to_dist += rpt->credits;
dist = true;
}
/*
* Refresh tx depth for distribution function that will
* recover these credits NOTE: this is only valid when
* there are credits to recover!
*/
endpoint->cred_dist.txq_depth =
get_queue_depth(&endpoint->txq);
tot_credits += rpt->credits;
}
if (dist) {
/*
* This was a credit return based on a completed send
* operations note, this is done with the lock held
*/
ath6kl_credit_distribute(target->credit_info,
&target->cred_dist_list,
HTC_CREDIT_DIST_SEND_COMPLETE);
}
spin_unlock_bh(&target->tx_lock);
if (tot_credits)
htc_chk_ep_txq(target);
}
static int htc_parse_trailer(struct htc_target *target,
struct htc_record_hdr *record,
u8 *record_buf, u32 *next_lk_ahds,
enum htc_endpoint_id endpoint,
int *n_lk_ahds)
{
struct htc_bundle_lkahd_rpt *bundle_lkahd_rpt;
struct htc_lookahead_report *lk_ahd;
int len;
switch (record->rec_id) {
case HTC_RECORD_CREDITS:
len = record->len / sizeof(struct htc_credit_report);
if (!len) {
WARN_ON(1);
return -EINVAL;
}
htc_proc_cred_rpt(target,
(struct htc_credit_report *) record_buf,
len, endpoint);
break;
case HTC_RECORD_LOOKAHEAD:
len = record->len / sizeof(*lk_ahd);
if (!len) {
WARN_ON(1);
return -EINVAL;
}
lk_ahd = (struct htc_lookahead_report *) record_buf;
if ((lk_ahd->pre_valid == ((~lk_ahd->post_valid) & 0xFF)) &&
next_lk_ahds) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx lk_ahd found pre_valid 0x%x post_valid 0x%x\n",
lk_ahd->pre_valid, lk_ahd->post_valid);
/* look ahead bytes are valid, copy them over */
memcpy((u8 *)&next_lk_ahds[0], lk_ahd->lk_ahd, 4);
ath6kl_dbg_dump(ATH6KL_DBG_HTC,
"htc rx next look ahead",
"", next_lk_ahds, 4);
*n_lk_ahds = 1;
}
break;
case HTC_RECORD_LOOKAHEAD_BUNDLE:
len = record->len / sizeof(*bundle_lkahd_rpt);
if (!len || (len > HTC_HOST_MAX_MSG_PER_BUNDLE)) {
WARN_ON(1);
return -EINVAL;
}
if (next_lk_ahds) {
int i;
bundle_lkahd_rpt =
(struct htc_bundle_lkahd_rpt *) record_buf;
ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bundle lk_ahd",
"", record_buf, record->len);
for (i = 0; i < len; i++) {
memcpy((u8 *)&next_lk_ahds[i],
bundle_lkahd_rpt->lk_ahd, 4);
bundle_lkahd_rpt++;
}
*n_lk_ahds = i;
}
break;
default:
ath6kl_err("unhandled record: id:%d len:%d\n",
record->rec_id, record->len);
break;
}
return 0;
}
static int htc_proc_trailer(struct htc_target *target,
u8 *buf, int len, u32 *next_lk_ahds,
int *n_lk_ahds, enum htc_endpoint_id endpoint)
{
struct htc_record_hdr *record;
int orig_len;
int status;
u8 *record_buf;
u8 *orig_buf;
ath6kl_dbg(ATH6KL_DBG_HTC, "htc rx trailer len %d\n", len);
ath6kl_dbg_dump(ATH6KL_DBG_HTC, NULL, "", buf, len);
orig_buf = buf;
orig_len = len;
status = 0;
while (len > 0) {
if (len < sizeof(struct htc_record_hdr)) {
status = -ENOMEM;
break;
}
/* these are byte aligned structs */
record = (struct htc_record_hdr *) buf;
len -= sizeof(struct htc_record_hdr);
buf += sizeof(struct htc_record_hdr);
if (record->len > len) {
ath6kl_err("invalid record len: %d (id:%d) buf has: %d bytes left\n",
record->len, record->rec_id, len);
status = -ENOMEM;
break;
}
record_buf = buf;
status = htc_parse_trailer(target, record, record_buf,
next_lk_ahds, endpoint, n_lk_ahds);
if (status)
break;
/* advance buffer past this record for next time around */
buf += record->len;
len -= record->len;
}
if (status)
ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad trailer",
"", orig_buf, orig_len);
return status;
}
static int ath6kl_htc_rx_process_hdr(struct htc_target *target,
struct htc_packet *packet,
u32 *next_lkahds, int *n_lkahds)
{
int status = 0;
u16 payload_len;
u32 lk_ahd;
struct htc_frame_hdr *htc_hdr = (struct htc_frame_hdr *)packet->buf;
if (n_lkahds != NULL)
*n_lkahds = 0;
/*
* NOTE: we cannot assume the alignment of buf, so we use the safe
* macros to retrieve 16 bit fields.
*/
payload_len = le16_to_cpu(get_unaligned(&htc_hdr->payld_len));
memcpy((u8 *)&lk_ahd, packet->buf, sizeof(lk_ahd));
if (packet->info.rx.rx_flags & HTC_RX_PKT_REFRESH_HDR) {
/*
* Refresh the expected header and the actual length as it
* was unknown when this packet was grabbed as part of the
* bundle.
*/
packet->info.rx.exp_hdr = lk_ahd;
packet->act_len = payload_len + HTC_HDR_LENGTH;
/* validate the actual header that was refreshed */
if (packet->act_len > packet->buf_len) {
ath6kl_err("refreshed hdr payload len (%d) in bundled recv is invalid (hdr: 0x%X)\n",
payload_len, lk_ahd);
/*
* Limit this to max buffer just to print out some
* of the buffer.
*/
packet->act_len = min(packet->act_len, packet->buf_len);
status = -ENOMEM;
goto fail_rx;
}
if (packet->endpoint != htc_hdr->eid) {
ath6kl_err("refreshed hdr ep (%d) does not match expected ep (%d)\n",
htc_hdr->eid, packet->endpoint);
status = -ENOMEM;
goto fail_rx;
}
}
if (lk_ahd != packet->info.rx.exp_hdr) {
ath6kl_err("%s(): lk_ahd mismatch! (pPkt:0x%p flags:0x%X)\n",
__func__, packet, packet->info.rx.rx_flags);
ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx expected lk_ahd",
"", &packet->info.rx.exp_hdr, 4);
ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx current header",
"", (u8 *)&lk_ahd, sizeof(lk_ahd));
status = -ENOMEM;
goto fail_rx;
}
if (htc_hdr->flags & HTC_FLG_RX_TRAILER) {
if (htc_hdr->ctrl[0] < sizeof(struct htc_record_hdr) ||
htc_hdr->ctrl[0] > payload_len) {
ath6kl_err("%s(): invalid hdr (payload len should be :%d, CB[0] is:%d)\n",
__func__, payload_len, htc_hdr->ctrl[0]);
status = -ENOMEM;
goto fail_rx;
}
if (packet->info.rx.rx_flags & HTC_RX_PKT_IGNORE_LOOKAHEAD) {
next_lkahds = NULL;
n_lkahds = NULL;
}
status = htc_proc_trailer(target, packet->buf + HTC_HDR_LENGTH
+ payload_len - htc_hdr->ctrl[0],
htc_hdr->ctrl[0], next_lkahds,
n_lkahds, packet->endpoint);
if (status)
goto fail_rx;
packet->act_len -= htc_hdr->ctrl[0];
}
packet->buf += HTC_HDR_LENGTH;
packet->act_len -= HTC_HDR_LENGTH;
fail_rx:
if (status)
ath6kl_dbg_dump(ATH6KL_DBG_HTC, "htc rx bad packet",
"", packet->buf, packet->act_len);
return status;
}
static void ath6kl_htc_rx_complete(struct htc_endpoint *endpoint,
struct htc_packet *packet)
{
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx complete ep %d packet 0x%p\n",
endpoint->eid, packet);
endpoint->ep_cb.rx(endpoint->target, packet);
}
static int ath6kl_htc_rx_bundle(struct htc_target *target,
struct list_head *rxq,
struct list_head *sync_compq,
int *n_pkt_fetched, bool part_bundle)
{
struct hif_scatter_req *scat_req;
struct htc_packet *packet;
int rem_space = target->max_rx_bndl_sz;
int n_scat_pkt, status = 0, i, len;
n_scat_pkt = get_queue_depth(rxq);
n_scat_pkt = min(n_scat_pkt, target->msg_per_bndl_max);
if ((get_queue_depth(rxq) - n_scat_pkt) > 0) {
/*
* We were forced to split this bundle receive operation
* all packets in this partial bundle must have their
* lookaheads ignored.
*/
part_bundle = true;
/*
* This would only happen if the target ignored our max
* bundle limit.
*/
ath6kl_warn("%s(): partial bundle detected num:%d , %d\n",
__func__, get_queue_depth(rxq), n_scat_pkt);
}
len = 0;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx bundle depth %d pkts %d\n",
get_queue_depth(rxq), n_scat_pkt);
scat_req = hif_scatter_req_get(target->dev->ar);
if (scat_req == NULL)
goto fail_rx_pkt;
for (i = 0; i < n_scat_pkt; i++) {
int pad_len;
packet = list_first_entry(rxq, struct htc_packet, list);
list_del(&packet->list);
pad_len = CALC_TXRX_PADDED_LEN(target,
packet->act_len);
if ((rem_space - pad_len) < 0) {
list_add(&packet->list, rxq);
break;
}
rem_space -= pad_len;
if (part_bundle || (i < (n_scat_pkt - 1)))
/*
* Packet 0..n-1 cannot be checked for look-aheads
* since we are fetching a bundle the last packet
* however can have it's lookahead used
*/
packet->info.rx.rx_flags |=
HTC_RX_PKT_IGNORE_LOOKAHEAD;
/* NOTE: 1 HTC packet per scatter entry */
scat_req->scat_list[i].buf = packet->buf;
scat_req->scat_list[i].len = pad_len;
packet->info.rx.rx_flags |= HTC_RX_PKT_PART_OF_BUNDLE;
list_add_tail(&packet->list, sync_compq);
WARN_ON(!scat_req->scat_list[i].len);
len += scat_req->scat_list[i].len;
}
scat_req->len = len;
scat_req->scat_entries = i;
status = ath6kl_hif_submit_scat_req(target->dev, scat_req, true);
if (!status)
*n_pkt_fetched = i;
/* free scatter request */
hif_scatter_req_add(target->dev->ar, scat_req);
fail_rx_pkt:
return status;
}
static int ath6kl_htc_rx_process_packets(struct htc_target *target,
struct list_head *comp_pktq,
u32 lk_ahds[],
int *n_lk_ahd)
{
struct htc_packet *packet, *tmp_pkt;
struct htc_endpoint *ep;
int status = 0;
list_for_each_entry_safe(packet, tmp_pkt, comp_pktq, list) {
ep = &target->endpoint[packet->endpoint];
trace_ath6kl_htc_rx(packet->status, packet->endpoint,
packet->buf, packet->act_len);
/* process header for each of the recv packet */
status = ath6kl_htc_rx_process_hdr(target, packet, lk_ahds,
n_lk_ahd);
if (status)
return status;
list_del(&packet->list);
if (list_empty(comp_pktq)) {
/*
* Last packet's more packet flag is set
* based on the lookahead.
*/
if (*n_lk_ahd > 0)
ath6kl_htc_rx_set_indicate(lk_ahds[0],
ep, packet);
} else
/*
* Packets in a bundle automatically have
* this flag set.
*/
packet->info.rx.indicat_flags |=
HTC_RX_FLAGS_INDICATE_MORE_PKTS;
ath6kl_htc_rx_update_stats(ep, *n_lk_ahd);
if (packet->info.rx.rx_flags & HTC_RX_PKT_PART_OF_BUNDLE)
ep->ep_st.rx_bundl += 1;
ath6kl_htc_rx_complete(ep, packet);
}
return status;
}
static int ath6kl_htc_rx_fetch(struct htc_target *target,
struct list_head *rx_pktq,
struct list_head *comp_pktq)
{
int fetched_pkts;
bool part_bundle = false;
int status = 0;
struct list_head tmp_rxq;
struct htc_packet *packet, *tmp_pkt;
/* now go fetch the list of HTC packets */
while (!list_empty(rx_pktq)) {
fetched_pkts = 0;
INIT_LIST_HEAD(&tmp_rxq);
if (target->rx_bndl_enable && (get_queue_depth(rx_pktq) > 1)) {
/*
* There are enough packets to attempt a
* bundle transfer and recv bundling is
* allowed.
*/
status = ath6kl_htc_rx_bundle(target, rx_pktq,
&tmp_rxq,
&fetched_pkts,
part_bundle);
if (status)
goto fail_rx;
if (!list_empty(rx_pktq))
part_bundle = true;
list_splice_tail_init(&tmp_rxq, comp_pktq);
}
if (!fetched_pkts) {
packet = list_first_entry(rx_pktq, struct htc_packet,
list);
/* fully synchronous */
packet->completion = NULL;
if (!list_is_singular(rx_pktq))
/*
* look_aheads in all packet
* except the last one in the
* bundle must be ignored
*/
packet->info.rx.rx_flags |=
HTC_RX_PKT_IGNORE_LOOKAHEAD;
/* go fetch the packet */
status = ath6kl_htc_rx_packet(target, packet,
packet->act_len);
list_move_tail(&packet->list, &tmp_rxq);
if (status)
goto fail_rx;
list_splice_tail_init(&tmp_rxq, comp_pktq);
}
}
return 0;
fail_rx:
/*
* Cleanup any packets we allocated but didn't use to
* actually fetch any packets.
*/
list_for_each_entry_safe(packet, tmp_pkt, rx_pktq, list) {
list_del(&packet->list);
htc_reclaim_rxbuf(target, packet,
&target->endpoint[packet->endpoint]);
}
list_for_each_entry_safe(packet, tmp_pkt, &tmp_rxq, list) {
list_del(&packet->list);
htc_reclaim_rxbuf(target, packet,
&target->endpoint[packet->endpoint]);
}
return status;
}
int ath6kl_htc_rxmsg_pending_handler(struct htc_target *target,
u32 msg_look_ahead, int *num_pkts)
{
struct htc_packet *packets, *tmp_pkt;
struct htc_endpoint *endpoint;
struct list_head rx_pktq, comp_pktq;
int status = 0;
u32 look_aheads[HTC_HOST_MAX_MSG_PER_BUNDLE];
int num_look_ahead = 1;
enum htc_endpoint_id id;
int n_fetched = 0;
INIT_LIST_HEAD(&comp_pktq);
*num_pkts = 0;
/*
* On first entry copy the look_aheads into our temp array for
* processing
*/
look_aheads[0] = msg_look_ahead;
while (true) {
/*
* First lookahead sets the expected endpoint IDs for all
* packets in a bundle.
*/
id = ((struct htc_frame_hdr *)&look_aheads[0])->eid;
endpoint = &target->endpoint[id];
if (id >= ENDPOINT_MAX) {
ath6kl_err("MsgPend, invalid endpoint in look-ahead: %d\n",
id);
status = -ENOMEM;
break;
}
INIT_LIST_HEAD(&rx_pktq);
INIT_LIST_HEAD(&comp_pktq);
/*
* Try to allocate as many HTC RX packets indicated by the
* look_aheads.
*/
status = ath6kl_htc_rx_alloc(target, look_aheads,
num_look_ahead, endpoint,
&rx_pktq);
if (status)
break;
if (get_queue_depth(&rx_pktq) >= 2)
/*
* A recv bundle was detected, force IRQ status
* re-check again
*/
target->chk_irq_status_cnt = 1;
n_fetched += get_queue_depth(&rx_pktq);
num_look_ahead = 0;
status = ath6kl_htc_rx_fetch(target, &rx_pktq, &comp_pktq);
if (!status)
ath6kl_htc_rx_chk_water_mark(endpoint);
/* Process fetched packets */
status = ath6kl_htc_rx_process_packets(target, &comp_pktq,
look_aheads,
&num_look_ahead);
if (!num_look_ahead || status)
break;
/*
* For SYNCH processing, if we get here, we are running
* through the loop again due to a detected lookahead. Set
* flag that we should re-check IRQ status registers again
* before leaving IRQ processing, this can net better
* performance in high throughput situations.
*/
target->chk_irq_status_cnt = 1;
}
if (status) {
if (status != -ECANCELED)
ath6kl_err("failed to get pending recv messages: %d\n",
status);
/* cleanup any packets in sync completion queue */
list_for_each_entry_safe(packets, tmp_pkt, &comp_pktq, list) {
list_del(&packets->list);
htc_reclaim_rxbuf(target, packets,
&target->endpoint[packets->endpoint]);
}
if (target->htc_flags & HTC_OP_STATE_STOPPING) {
ath6kl_warn("host is going to stop blocking receiver for htc_stop\n");
ath6kl_hif_rx_control(target->dev, false);
}
}
/*
* Before leaving, check to see if host ran out of buffers and
* needs to stop the receiver.
*/
if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
ath6kl_warn("host has no rx buffers blocking receiver to prevent overrun\n");
ath6kl_hif_rx_control(target->dev, false);
}
*num_pkts = n_fetched;
return status;
}
/*
* Synchronously wait for a control message from the target,
* This function is used at initialization time ONLY. At init messages
* on ENDPOINT 0 are expected.
*/
static struct htc_packet *htc_wait_for_ctrl_msg(struct htc_target *target)
{
struct htc_packet *packet = NULL;
struct htc_frame_hdr *htc_hdr;
u32 look_ahead;
if (ath6kl_hif_poll_mboxmsg_rx(target->dev, &look_ahead,
HTC_TARGET_RESPONSE_TIMEOUT))
return NULL;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx wait ctrl look_ahead 0x%X\n", look_ahead);
htc_hdr = (struct htc_frame_hdr *)&look_ahead;
if (htc_hdr->eid != ENDPOINT_0)
return NULL;
packet = htc_get_control_buf(target, false);
if (!packet)
return NULL;
packet->info.rx.rx_flags = 0;
packet->info.rx.exp_hdr = look_ahead;
packet->act_len = le16_to_cpu(htc_hdr->payld_len) + HTC_HDR_LENGTH;
if (packet->act_len > packet->buf_len)
goto fail_ctrl_rx;
/* we want synchronous operation */
packet->completion = NULL;
/* get the message from the device, this will block */
if (ath6kl_htc_rx_packet(target, packet, packet->act_len))
goto fail_ctrl_rx;
trace_ath6kl_htc_rx(packet->status, packet->endpoint,
packet->buf, packet->act_len);
/* process receive header */
packet->status = ath6kl_htc_rx_process_hdr(target, packet, NULL, NULL);
if (packet->status) {
ath6kl_err("htc_wait_for_ctrl_msg, ath6kl_htc_rx_process_hdr failed (status = %d)\n",
packet->status);
goto fail_ctrl_rx;
}
return packet;
fail_ctrl_rx:
if (packet != NULL) {
htc_rxpkt_reset(packet);
reclaim_rx_ctrl_buf(target, packet);
}
return NULL;
}
static int ath6kl_htc_mbox_add_rxbuf_multiple(struct htc_target *target,
struct list_head *pkt_queue)
{
struct htc_endpoint *endpoint;
struct htc_packet *first_pkt;
bool rx_unblock = false;
int status = 0, depth;
if (list_empty(pkt_queue))
return -ENOMEM;
first_pkt = list_first_entry(pkt_queue, struct htc_packet, list);
if (first_pkt->endpoint >= ENDPOINT_MAX)
return status;
depth = get_queue_depth(pkt_queue);
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx add multiple ep id %d cnt %d len %d\n",
first_pkt->endpoint, depth, first_pkt->buf_len);
endpoint = &target->endpoint[first_pkt->endpoint];
if (target->htc_flags & HTC_OP_STATE_STOPPING) {
struct htc_packet *packet, *tmp_pkt;
/* walk through queue and mark each one canceled */
list_for_each_entry_safe(packet, tmp_pkt, pkt_queue, list) {
packet->status = -ECANCELED;
list_del(&packet->list);
ath6kl_htc_rx_complete(endpoint, packet);
}
return status;
}
spin_lock_bh(&target->rx_lock);
list_splice_tail_init(pkt_queue, &endpoint->rx_bufq);
/* check if we are blocked waiting for a new buffer */
if (target->rx_st_flags & HTC_RECV_WAIT_BUFFERS) {
if (target->ep_waiting == first_pkt->endpoint) {
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx blocked on ep %d, unblocking\n",
target->ep_waiting);
target->rx_st_flags &= ~HTC_RECV_WAIT_BUFFERS;
target->ep_waiting = ENDPOINT_MAX;
rx_unblock = true;
}
}
spin_unlock_bh(&target->rx_lock);
if (rx_unblock && !(target->htc_flags & HTC_OP_STATE_STOPPING))
/* TODO : implement a buffer threshold count? */
ath6kl_hif_rx_control(target->dev, true);
return status;
}
static void ath6kl_htc_mbox_flush_rx_buf(struct htc_target *target)
{
struct htc_endpoint *endpoint;
struct htc_packet *packet, *tmp_pkt;
int i;
for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
endpoint = &target->endpoint[i];
if (!endpoint->svc_id)
/* not in use.. */
continue;
spin_lock_bh(&target->rx_lock);
list_for_each_entry_safe(packet, tmp_pkt,
&endpoint->rx_bufq, list) {
list_del(&packet->list);
spin_unlock_bh(&target->rx_lock);
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc rx flush pkt 0x%p len %d ep %d\n",
packet, packet->buf_len,
packet->endpoint);
/*
* packets in rx_bufq of endpoint 0 have originally
* been queued from target->free_ctrl_rxbuf where
* packet and packet->buf_start are allocated
* separately using kmalloc(). For other endpoint
* rx_bufq, it is allocated as skb where packet is
* skb->head. Take care of this difference while freeing
* the memory.
*/
if (packet->endpoint == ENDPOINT_0) {
kfree(packet->buf_start);
kfree(packet);
} else {
dev_kfree_skb(packet->pkt_cntxt);
}
spin_lock_bh(&target->rx_lock);
}
spin_unlock_bh(&target->rx_lock);
}
}
static int ath6kl_htc_mbox_conn_service(struct htc_target *target,
struct htc_service_connect_req *conn_req,
struct htc_service_connect_resp *conn_resp)
{
struct htc_packet *rx_pkt = NULL;
struct htc_packet *tx_pkt = NULL;
struct htc_conn_service_resp *resp_msg;
struct htc_conn_service_msg *conn_msg;
struct htc_endpoint *endpoint;
enum htc_endpoint_id assigned_ep = ENDPOINT_MAX;
unsigned int max_msg_sz = 0;
int status = 0;
u16 msg_id;
ath6kl_dbg(ATH6KL_DBG_HTC,
"htc connect service target 0x%p service id 0x%x\n",
target, conn_req->svc_id);
if (conn_req->svc_id == HTC_CTRL_RSVD_SVC) {
/* special case for pseudo control service */
assigned_ep = ENDPOINT_0;
max_msg_sz = HTC_MAX_CTRL_MSG_LEN;
} else {
/* allocate a packet to send to the target */
tx_pkt = htc_get_control_buf(target, true);
if (!tx_pkt)
return -ENOMEM;
conn_msg = (struct htc_conn_service_msg *)tx_pkt->buf;
memset(conn_msg, 0, sizeof(*conn_msg));
conn_msg->msg_id = cpu_to_le16(HTC_MSG_CONN_SVC_ID);
conn_msg->svc_id = cpu_to_le16(conn_req->svc_id);
conn_msg->conn_flags = cpu_to_le16(conn_req->conn_flags);
set_htc_pkt_info(tx_pkt, NULL, (u8 *) conn_msg,
sizeof(*conn_msg) + conn_msg->svc_meta_len,
ENDPOINT_0, HTC_SERVICE_TX_PACKET_TAG);
/* we want synchronous operation */
tx_pkt->completion = NULL;
ath6kl_htc_tx_prep_pkt(tx_pkt, 0, 0, 0);
status = ath6kl_htc_tx_issue(target, tx_pkt);
if (status)
goto fail_tx;
/* wait for response */
rx_pkt = htc_wait_for_ctrl_msg(target);
if (!rx_pkt) {
status = -ENOMEM;
goto fail_tx;
}
resp_msg = (struct htc_conn_service_resp *)rx_pkt->buf;
msg_id = le16_to_cpu(resp_msg->msg_id);
if ((msg_id != HTC_MSG_CONN_SVC_RESP_ID) ||
(rx_pkt->act_len < sizeof(*resp_msg))) {
status = -ENOMEM;
goto fail_tx;
}
conn_resp->resp_code = resp_msg->status;
/* check response status */
if (resp_msg->status != HTC_SERVICE_SUCCESS) {
ath6kl_err("target failed service 0x%X connect request (status:%d)\n",
resp_msg->svc_id, resp_msg->status);
status = -ENOMEM;
goto fail_tx;
}
assigned_ep = (enum htc_endpoint_id)resp_msg->eid;
max_msg_sz = le16_to_cpu(resp_msg->max_msg_sz);
}
if (WARN_ON_ONCE(assigned_ep == ENDPOINT_UNUSED ||
assigned_ep >= ENDPOINT_MAX || !max_msg_sz)) {
status = -ENOMEM;
goto fail_tx;
}
endpoint = &target->endpoint[assigned_ep];
endpoint->eid = assigned_ep;
if (endpoint->svc_id) {
status = -ENOMEM;
goto fail_tx;
}
/* return assigned endpoint to caller */
conn_resp->endpoint = assigned_ep;
conn_resp->len_max = max_msg_sz;
/* setup the endpoint */
/* this marks the endpoint in use */
endpoint->svc_id = conn_req->svc_id;
endpoint->max_txq_depth = conn_req->max_txq_depth;
endpoint->len_max = max_msg_sz;
endpoint->ep_cb = conn_req->ep_cb;
endpoint->cred_dist.svc_id = conn_req->svc_id;
endpoint->cred_dist.htc_ep = endpoint;
endpoint->cred_dist.endpoint = assigned_ep;
endpoint->cred_dist.cred_sz = target->tgt_cred_sz;
switch (endpoint->svc_id) {
case WMI_DATA_BK_SVC:
endpoint->tx_drop_packet_threshold = MAX_DEF_COOKIE_NUM / 3;
break;
default:
endpoint->tx_drop_packet_threshold = MAX_HI_COOKIE_NUM;
break;
}
if (conn_req->max_rxmsg_sz) {
/*
* Override cred_per_msg calculation, this optimizes
* the credit-low indications since the host will actually
* issue smaller messages in the Send path.
*/
if (conn_req->max_rxmsg_sz > max_msg_sz) {
status = -ENOMEM;
goto fail_tx;
}
endpoint->cred_dist.cred_per_msg =
conn_req->max_rxmsg_sz / target->tgt_cred_sz;
} else
endpoint->cred_dist.cred_per_msg =
max_msg_sz / target->tgt_cred_sz;
if (!endpoint->cred_dist.cred_per_msg)
endpoint->cred_dist.cred_per_msg = 1;
/* save local connection flags */
endpoint->conn_flags = conn_req->flags;
fail_tx:
if (tx_pkt)
htc_reclaim_txctrl_buf(target, tx_pkt);
if (rx_pkt) {
htc_rxpkt_reset(rx_pkt);
reclaim_rx_ctrl_buf(target, rx_pkt);
}
return status;
}
static void reset_ep_state(struct htc_target *target)
{
struct htc_endpoint *endpoint;
int i;
for (i = ENDPOINT_0; i < ENDPOINT_MAX; i++) {
endpoint = &target->endpoint[i];
memset(&endpoint->cred_dist, 0, sizeof(endpoint->cred_dist));
endpoint->svc_id = 0;
endpoint->len_max = 0;
endpoint->max_txq_depth = 0;
memset(&endpoint->ep_st, 0,
sizeof(endpoint->ep_st));
INIT_LIST_HEAD(&endpoint->rx_bufq);
INIT_LIST_HEAD(&endpoint->txq);
endpoint->target = target;
}
/* reset distribution list */
/* FIXME: free existing entries */
INIT_LIST_HEAD(&target->cred_dist_list);
}
static int ath6kl_htc_mbox_get_rxbuf_num(struct htc_target *target,
enum htc_endpoint_id endpoint)
{
int num;
spin_lock_bh(&target->rx_lock);
num = get_queue_depth(&(target->endpoint[endpoint].rx_bufq));
spin_unlock_bh(&target->rx_lock);
return num;
}
static void htc_setup_msg_bndl(struct htc_target *target)
{
/* limit what HTC can handle */
target->msg_per_bndl_max = min(HTC_HOST_MAX_MSG_PER_BUNDLE,
target->msg_per_bndl_max);
if (ath6kl_hif_enable_scatter(target->dev->ar)) {
target->msg_per_bndl_max = 0;
return;
}
/* limit bundle what the device layer can handle */
target->msg_per_bndl_max = min(target->max_scat_entries,
target->msg_per_bndl_max);
ath6kl_dbg(ATH6KL_DBG_BOOT,
"htc bundling allowed msg_per_bndl_max %d\n",
target->msg_per_bndl_max);
/* Max rx bundle size is limited by the max tx bundle size */
target->max_rx_bndl_sz = target->max_xfer_szper_scatreq;
/* Max tx bundle size if limited by the extended mbox address range */
target->max_tx_bndl_sz = min(HIF_MBOX0_EXT_WIDTH,
target->max_xfer_szper_scatreq);
ath6kl_dbg(ATH6KL_DBG_BOOT, "htc max_rx_bndl_sz %d max_tx_bndl_sz %d\n",
target->max_rx_bndl_sz, target->max_tx_bndl_sz);
if (target->max_tx_bndl_sz)
/* tx_bndl_mask is enabled per AC, each has 1 bit */
target->tx_bndl_mask = (1 << WMM_NUM_AC) - 1;
if (target->max_rx_bndl_sz)
target->rx_bndl_enable = true;
if ((target->tgt_cred_sz % target->block_sz) != 0) {
ath6kl_warn("credit size: %d is not block aligned! Disabling send bundling\n",
target->tgt_cred_sz);
/*
* Disallow send bundling since the credit size is
* not aligned to a block size the I/O block
* padding will spill into the next credit buffer
* which is fatal.
*/
target->tx_bndl_mask = 0;
}
}
static int ath6kl_htc_mbox_wait_target(struct htc_target *target)
{
struct htc_packet *packet = NULL;
struct htc_ready_ext_msg *rdy_msg;
struct htc_service_connect_req connect;
struct htc_service_connect_resp resp;
int status;
/* we should be getting 1 control message that the target is ready */
packet = htc_wait_for_ctrl_msg(target);
if (!packet)
return -ENOMEM;
/* we controlled the buffer creation so it's properly aligned */
rdy_msg = (struct htc_ready_ext_msg *)packet->buf;
if ((le16_to_cpu(rdy_msg->ver2_0_info.msg_id) != HTC_MSG_READY_ID) ||
(packet->act_len < sizeof(struct htc_ready_msg))) {
status = -ENOMEM;
goto fail_wait_target;
}
if (!rdy_msg->ver2_0_info.cred_cnt || !rdy_msg->ver2_0_info.cred_sz) {
status = -ENOMEM;
goto fail_wait_target;
}
target->tgt_creds = le16_to_cpu(rdy_msg->ver2_0_info.cred_cnt);
target->tgt_cred_sz = le16_to_cpu(rdy_msg->ver2_0_info.cred_sz);
ath6kl_dbg(ATH6KL_DBG_BOOT,
"htc target ready credits %d size %d\n",
target->tgt_creds, target->tgt_cred_sz);
/* check if this is an extended ready message */
if (packet->act_len >= sizeof(struct htc_ready_ext_msg)) {
/* this is an extended message */
target->htc_tgt_ver = rdy_msg->htc_ver;
target->msg_per_bndl_max = rdy_msg->msg_per_htc_bndl;
} else {
/* legacy */
target->htc_tgt_ver = HTC_VERSION_2P0;
target->msg_per_bndl_max = 0;
}
ath6kl_dbg(ATH6KL_DBG_BOOT, "htc using protocol %s (%d)\n",
(target->htc_tgt_ver == HTC_VERSION_2P0) ? "2.0" : ">= 2.1",
target->htc_tgt_ver);
if (target->msg_per_bndl_max > 0)
htc_setup_msg_bndl(target);
/* setup our pseudo HTC control endpoint connection */
memset(&connect, 0, sizeof(connect));
memset(&resp, 0, sizeof(resp));
connect.ep_cb.rx = htc_ctrl_rx;
connect.ep_cb.rx_refill = NULL;
connect.ep_cb.tx_full = NULL;
connect.max_txq_depth = NUM_CONTROL_BUFFERS;
connect.svc_id = HTC_CTRL_RSVD_SVC;
/* connect fake service */
status = ath6kl_htc_mbox_conn_service((void *)target, &connect, &resp);
if (status)
/*
* FIXME: this call doesn't make sense, the caller should
* call ath6kl_htc_mbox_cleanup() when it wants remove htc
*/
ath6kl_hif_cleanup_scatter(target->dev->ar);
fail_wait_target:
if (packet) {
htc_rxpkt_reset(packet);
reclaim_rx_ctrl_buf(target, packet);
}
return status;
}
/*
* Start HTC, enable interrupts and let the target know
* host has finished setup.
*/
static int ath6kl_htc_mbox_start(struct htc_target *target)
{
struct htc_packet *packet;
int status;
memset(&target->dev->irq_proc_reg, 0,
sizeof(target->dev->irq_proc_reg));
/* Disable interrupts at the chip level */
ath6kl_hif_disable_intrs(target->dev);
target->htc_flags = 0;
target->rx_st_flags = 0;
/* Push control receive buffers into htc control endpoint */
while ((packet = htc_get_control_buf(target, false)) != NULL) {
status = htc_add_rxbuf(target, packet);
if (status)
return status;
}
/* NOTE: the first entry in the distribution list is ENDPOINT_0 */
ath6kl_credit_init(target->credit_info, &target->cred_dist_list,
target->tgt_creds);
dump_cred_dist_stats(target);
/* Indicate to the target of the setup completion */
status = htc_setup_tx_complete(target);
if (status)
return status;
/* unmask interrupts */
status = ath6kl_hif_unmask_intrs(target->dev);
if (status)
ath6kl_htc_mbox_stop(target);
return status;
}
static int ath6kl_htc_reset(struct htc_target *target)
{
u32 block_size, ctrl_bufsz;
struct htc_packet *packet;
int i;
reset_ep_state(target);
block_size = target->dev->ar->mbox_info.block_size;
ctrl_bufsz = (block_size > HTC_MAX_CTRL_MSG_LEN) ?
(block_size + HTC_HDR_LENGTH) :
(HTC_MAX_CTRL_MSG_LEN + HTC_HDR_LENGTH);
for (i = 0; i < NUM_CONTROL_BUFFERS; i++) {
packet = kzalloc(sizeof(*packet), GFP_KERNEL);
if (!packet)
return -ENOMEM;
packet->buf_start = kzalloc(ctrl_bufsz, GFP_KERNEL);
if (!packet->buf_start) {
kfree(packet);
return -ENOMEM;
}
packet->buf_len = ctrl_bufsz;
if (i < NUM_CONTROL_RX_BUFFERS) {
packet->act_len = 0;
packet->buf = packet->buf_start;
packet->endpoint = ENDPOINT_0;
list_add_tail(&packet->list, &target->free_ctrl_rxbuf);
} else {
list_add_tail(&packet->list, &target->free_ctrl_txbuf);
}
}
return 0;
}
/* htc_stop: stop interrupt reception, and flush all queued buffers */
static void ath6kl_htc_mbox_stop(struct htc_target *target)
{
spin_lock_bh(&target->htc_lock);
target->htc_flags |= HTC_OP_STATE_STOPPING;
spin_unlock_bh(&target->htc_lock);
/*
* Masking interrupts is a synchronous operation, when this
* function returns all pending HIF I/O has completed, we can
* safely flush the queues.
*/
ath6kl_hif_mask_intrs(target->dev);
ath6kl_htc_flush_txep_all(target);
ath6kl_htc_mbox_flush_rx_buf(target);
ath6kl_htc_reset(target);
}
static void *ath6kl_htc_mbox_create(struct ath6kl *ar)
{
struct htc_target *target = NULL;
int status = 0;
target = kzalloc(sizeof(*target), GFP_KERNEL);
if (!target) {
ath6kl_err("unable to allocate memory\n");
return NULL;
}
target->dev = kzalloc(sizeof(*target->dev), GFP_KERNEL);
if (!target->dev) {
ath6kl_err("unable to allocate memory\n");
status = -ENOMEM;
goto err_htc_cleanup;
}
spin_lock_init(&target->htc_lock);
spin_lock_init(&target->rx_lock);
spin_lock_init(&target->tx_lock);
INIT_LIST_HEAD(&target->free_ctrl_txbuf);
INIT_LIST_HEAD(&target->free_ctrl_rxbuf);
INIT_LIST_HEAD(&target->cred_dist_list);
target->dev->ar = ar;
target->dev->htc_cnxt = target;
target->ep_waiting = ENDPOINT_MAX;
status = ath6kl_hif_setup(target->dev);
if (status)
goto err_htc_cleanup;
status = ath6kl_htc_reset(target);
if (status)
goto err_htc_cleanup;
return target;
err_htc_cleanup:
ath6kl_htc_mbox_cleanup(target);
return NULL;
}
/* cleanup the HTC instance */
static void ath6kl_htc_mbox_cleanup(struct htc_target *target)
{
struct htc_packet *packet, *tmp_packet;
ath6kl_hif_cleanup_scatter(target->dev->ar);
list_for_each_entry_safe(packet, tmp_packet,
&target->free_ctrl_txbuf, list) {
list_del(&packet->list);
kfree(packet->buf_start);
kfree(packet);
}
list_for_each_entry_safe(packet, tmp_packet,
&target->free_ctrl_rxbuf, list) {
list_del(&packet->list);
kfree(packet->buf_start);
kfree(packet);
}
kfree(target->dev);
kfree(target);
}
static const struct ath6kl_htc_ops ath6kl_htc_mbox_ops = {
.create = ath6kl_htc_mbox_create,
.wait_target = ath6kl_htc_mbox_wait_target,
.start = ath6kl_htc_mbox_start,
.conn_service = ath6kl_htc_mbox_conn_service,
.tx = ath6kl_htc_mbox_tx,
.stop = ath6kl_htc_mbox_stop,
.cleanup = ath6kl_htc_mbox_cleanup,
.flush_txep = ath6kl_htc_mbox_flush_txep,
.flush_rx_buf = ath6kl_htc_mbox_flush_rx_buf,
.activity_changed = ath6kl_htc_mbox_activity_changed,
.get_rxbuf_num = ath6kl_htc_mbox_get_rxbuf_num,
.add_rxbuf_multiple = ath6kl_htc_mbox_add_rxbuf_multiple,
.credit_setup = ath6kl_htc_mbox_credit_setup,
};
void ath6kl_htc_mbox_attach(struct ath6kl *ar)
{
ar->htc_ops = &ath6kl_htc_mbox_ops;
}