562 lines
16 KiB
C
562 lines
16 KiB
C
/* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* IPC ROUTER SMD XPRT module.
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*/
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#define DEBUG
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <mach/msm_smd.h>
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#include <mach/subsystem_restart.h>
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#include "ipc_router.h"
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#include "smd_private.h"
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static int msm_ipc_router_smd_xprt_debug_mask;
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module_param_named(debug_mask, msm_ipc_router_smd_xprt_debug_mask,
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int, S_IRUGO | S_IWUSR | S_IWGRP);
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#if defined(DEBUG)
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#define D(x...) do { \
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if (msm_ipc_router_smd_xprt_debug_mask) \
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pr_info(x); \
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} while (0)
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#else
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#define D(x...) do { } while (0)
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#endif
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#define MIN_FRAG_SZ (IPC_ROUTER_HDR_SIZE + sizeof(union rr_control_msg))
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#define NUM_SMD_XPRTS 4
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#define XPRT_NAME_LEN (SMD_MAX_CH_NAME_LEN + 12)
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struct msm_ipc_router_smd_xprt {
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struct msm_ipc_router_xprt xprt;
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smd_channel_t *channel;
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struct workqueue_struct *smd_xprt_wq;
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wait_queue_head_t write_avail_wait_q;
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struct rr_packet *in_pkt;
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int is_partial_in_pkt;
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struct delayed_work read_work;
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spinlock_t ss_reset_lock; /*Subsystem reset lock*/
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int ss_reset;
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void *pil;
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struct completion sft_close_complete;
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unsigned xprt_version;
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unsigned xprt_option;
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};
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struct msm_ipc_router_smd_xprt_work {
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struct msm_ipc_router_xprt *xprt;
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struct work_struct work;
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};
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static void smd_xprt_read_data(struct work_struct *work);
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static void smd_xprt_open_event(struct work_struct *work);
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static void smd_xprt_close_event(struct work_struct *work);
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struct msm_ipc_router_smd_xprt_config {
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char ch_name[SMD_MAX_CH_NAME_LEN];
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char xprt_name[XPRT_NAME_LEN];
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uint32_t edge;
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uint32_t link_id;
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unsigned xprt_version;
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};
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struct msm_ipc_router_smd_xprt_config smd_xprt_cfg[] = {
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{"RPCRPY_CNTL", "ipc_rtr_smd_rpcrpy_cntl", SMD_APPS_MODEM, 1, 1},
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{"IPCRTR", "ipc_rtr_smd_ipcrtr", SMD_APPS_MODEM, 1, 1},
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{"IPCRTR", "ipc_rtr_q6_ipcrtr", SMD_APPS_QDSP, 1, 1},
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{"IPCRTR", "ipc_rtr_wcnss_ipcrtr", SMD_APPS_WCNSS, 1, 1},
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};
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static struct msm_ipc_router_smd_xprt smd_remote_xprt[NUM_SMD_XPRTS];
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static int find_smd_xprt_cfg(struct platform_device *pdev)
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{
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int i;
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for (i = 0; i < NUM_SMD_XPRTS; i++) {
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if (!strncmp(pdev->name, smd_xprt_cfg[i].ch_name, 20) &&
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(pdev->id == smd_xprt_cfg[i].edge))
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return i;
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}
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return -ENODEV;
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}
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static int msm_ipc_router_smd_get_xprt_version(
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struct msm_ipc_router_xprt *xprt)
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{
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struct msm_ipc_router_smd_xprt *smd_xprtp;
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if (!xprt)
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return -EINVAL;
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smd_xprtp = container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
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return (int)smd_xprtp->xprt_version;
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}
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static int msm_ipc_router_smd_get_xprt_option(
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struct msm_ipc_router_xprt *xprt)
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{
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struct msm_ipc_router_smd_xprt *smd_xprtp;
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if (!xprt)
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return -EINVAL;
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smd_xprtp = container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
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return (int)smd_xprtp->xprt_option;
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}
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static int msm_ipc_router_smd_remote_write_avail(
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struct msm_ipc_router_xprt *xprt)
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{
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struct msm_ipc_router_smd_xprt *smd_xprtp =
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container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
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return smd_write_avail(smd_xprtp->channel);
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}
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static int msm_ipc_router_smd_remote_write(void *data,
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uint32_t len,
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struct msm_ipc_router_xprt *xprt)
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{
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struct rr_packet *pkt = (struct rr_packet *)data;
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struct sk_buff *ipc_rtr_pkt;
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int offset, sz_written = 0;
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int ret, num_retries = 0;
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unsigned long flags;
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struct msm_ipc_router_smd_xprt *smd_xprtp =
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container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
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if (!pkt)
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return -EINVAL;
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if (!len || pkt->length != len)
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return -EINVAL;
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while ((ret = smd_write_start(smd_xprtp->channel, len)) < 0) {
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spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
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if (smd_xprtp->ss_reset) {
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spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock,
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flags);
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pr_err("%s: %s chnl reset\n", __func__, xprt->name);
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return -ENETRESET;
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}
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spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
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if (num_retries >= 5) {
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pr_err("%s: Error %d @smd_write_start for %s\n",
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__func__, ret, xprt->name);
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return ret;
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}
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msleep(50);
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num_retries++;
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}
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D("%s: Ready to write %d bytes\n", __func__, len);
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skb_queue_walk(pkt->pkt_fragment_q, ipc_rtr_pkt) {
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offset = 0;
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while (offset < ipc_rtr_pkt->len) {
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if (!smd_write_segment_avail(smd_xprtp->channel))
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smd_enable_read_intr(smd_xprtp->channel);
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wait_event(smd_xprtp->write_avail_wait_q,
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(smd_write_segment_avail(smd_xprtp->channel) ||
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smd_xprtp->ss_reset));
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smd_disable_read_intr(smd_xprtp->channel);
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spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
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if (smd_xprtp->ss_reset) {
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spin_unlock_irqrestore(
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&smd_xprtp->ss_reset_lock, flags);
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pr_err("%s: %s chnl reset\n",
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__func__, xprt->name);
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return -ENETRESET;
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}
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spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock,
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flags);
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sz_written = smd_write_segment(smd_xprtp->channel,
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ipc_rtr_pkt->data + offset,
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(ipc_rtr_pkt->len - offset), 0);
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offset += sz_written;
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sz_written = 0;
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}
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D("%s: Wrote %d bytes over %s\n",
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__func__, offset, xprt->name);
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}
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if (!smd_write_end(smd_xprtp->channel))
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D("%s: Finished writing\n", __func__);
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return len;
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}
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static int msm_ipc_router_smd_remote_close(struct msm_ipc_router_xprt *xprt)
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{
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int rc;
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struct msm_ipc_router_smd_xprt *smd_xprtp =
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container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
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rc = smd_close(smd_xprtp->channel);
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if (smd_xprtp->pil) {
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subsystem_put(smd_xprtp->pil);
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smd_xprtp->pil = NULL;
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}
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return rc;
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}
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static void smd_xprt_sft_close_done(struct msm_ipc_router_xprt *xprt)
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{
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struct msm_ipc_router_smd_xprt *smd_xprtp =
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container_of(xprt, struct msm_ipc_router_smd_xprt, xprt);
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complete_all(&smd_xprtp->sft_close_complete);
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}
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static void smd_xprt_read_data(struct work_struct *work)
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{
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int pkt_size, sz_read, sz;
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struct sk_buff *ipc_rtr_pkt;
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void *data;
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unsigned long flags;
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struct delayed_work *rwork = to_delayed_work(work);
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struct msm_ipc_router_smd_xprt *smd_xprtp =
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container_of(rwork, struct msm_ipc_router_smd_xprt, read_work);
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spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
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if (smd_xprtp->ss_reset) {
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spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
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if (smd_xprtp->in_pkt)
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release_pkt(smd_xprtp->in_pkt);
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smd_xprtp->is_partial_in_pkt = 0;
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pr_err("%s: %s channel reset\n",
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__func__, smd_xprtp->xprt.name);
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return;
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}
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spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
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D("%s pkt_size: %d, read_avail: %d\n", __func__,
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smd_cur_packet_size(smd_xprtp->channel),
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smd_read_avail(smd_xprtp->channel));
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while ((pkt_size = smd_cur_packet_size(smd_xprtp->channel)) &&
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smd_read_avail(smd_xprtp->channel)) {
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if (!smd_xprtp->is_partial_in_pkt) {
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smd_xprtp->in_pkt = kzalloc(sizeof(struct rr_packet),
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GFP_KERNEL);
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if (!smd_xprtp->in_pkt) {
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pr_err("%s: Couldn't alloc rr_packet\n",
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__func__);
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return;
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}
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smd_xprtp->in_pkt->pkt_fragment_q =
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kmalloc(sizeof(struct sk_buff_head),
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GFP_KERNEL);
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if (!smd_xprtp->in_pkt->pkt_fragment_q) {
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pr_err("%s: Couldn't alloc pkt_fragment_q\n",
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__func__);
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kfree(smd_xprtp->in_pkt);
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return;
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}
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skb_queue_head_init(smd_xprtp->in_pkt->pkt_fragment_q);
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smd_xprtp->is_partial_in_pkt = 1;
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D("%s: Allocated rr_packet\n", __func__);
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}
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if (((pkt_size >= MIN_FRAG_SZ) &&
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(smd_read_avail(smd_xprtp->channel) < MIN_FRAG_SZ)) ||
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((pkt_size < MIN_FRAG_SZ) &&
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(smd_read_avail(smd_xprtp->channel) < pkt_size)))
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return;
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sz = smd_read_avail(smd_xprtp->channel);
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do {
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ipc_rtr_pkt = alloc_skb(sz, GFP_KERNEL);
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if (!ipc_rtr_pkt) {
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if (sz <= (PAGE_SIZE/2)) {
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queue_delayed_work(
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smd_xprtp->smd_xprt_wq,
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&smd_xprtp->read_work,
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msecs_to_jiffies(100));
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return;
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}
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sz = sz / 2;
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}
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} while (!ipc_rtr_pkt);
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D("%s: Allocated the sk_buff of size %d\n", __func__, sz);
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data = skb_put(ipc_rtr_pkt, sz);
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sz_read = smd_read(smd_xprtp->channel, data, sz);
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if (sz_read != sz) {
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pr_err("%s: Couldn't read %s completely\n",
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__func__, smd_xprtp->xprt.name);
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kfree_skb(ipc_rtr_pkt);
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release_pkt(smd_xprtp->in_pkt);
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smd_xprtp->is_partial_in_pkt = 0;
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return;
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}
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skb_queue_tail(smd_xprtp->in_pkt->pkt_fragment_q, ipc_rtr_pkt);
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smd_xprtp->in_pkt->length += sz_read;
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if (sz_read != pkt_size)
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smd_xprtp->is_partial_in_pkt = 1;
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else
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smd_xprtp->is_partial_in_pkt = 0;
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if (!smd_xprtp->is_partial_in_pkt) {
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D("%s: Packet size read %d\n",
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__func__, smd_xprtp->in_pkt->length);
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msm_ipc_router_xprt_notify(&smd_xprtp->xprt,
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IPC_ROUTER_XPRT_EVENT_DATA,
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(void *)smd_xprtp->in_pkt);
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release_pkt(smd_xprtp->in_pkt);
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smd_xprtp->in_pkt = NULL;
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}
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}
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}
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static void smd_xprt_open_event(struct work_struct *work)
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{
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struct msm_ipc_router_smd_xprt_work *xprt_work =
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container_of(work, struct msm_ipc_router_smd_xprt_work, work);
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struct msm_ipc_router_smd_xprt *smd_xprtp =
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container_of(xprt_work->xprt,
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struct msm_ipc_router_smd_xprt, xprt);
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unsigned long flags;
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spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
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smd_xprtp->ss_reset = 0;
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spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
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msm_ipc_router_xprt_notify(xprt_work->xprt,
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IPC_ROUTER_XPRT_EVENT_OPEN, NULL);
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D("%s: Notified IPC Router of %s OPEN\n",
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__func__, xprt_work->xprt->name);
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kfree(xprt_work);
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}
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static void smd_xprt_close_event(struct work_struct *work)
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{
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struct msm_ipc_router_smd_xprt_work *xprt_work =
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container_of(work, struct msm_ipc_router_smd_xprt_work, work);
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struct msm_ipc_router_smd_xprt *smd_xprtp =
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container_of(xprt_work->xprt,
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struct msm_ipc_router_smd_xprt, xprt);
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init_completion(&smd_xprtp->sft_close_complete);
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msm_ipc_router_xprt_notify(xprt_work->xprt,
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IPC_ROUTER_XPRT_EVENT_CLOSE, NULL);
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D("%s: Notified IPC Router of %s CLOSE\n",
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__func__, xprt_work->xprt->name);
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wait_for_completion(&smd_xprtp->sft_close_complete);
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kfree(xprt_work);
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}
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static void msm_ipc_router_smd_remote_notify(void *_dev, unsigned event)
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{
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unsigned long flags;
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struct msm_ipc_router_smd_xprt *smd_xprtp;
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struct msm_ipc_router_smd_xprt_work *xprt_work;
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smd_xprtp = (struct msm_ipc_router_smd_xprt *)_dev;
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if (!smd_xprtp)
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return;
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switch (event) {
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case SMD_EVENT_DATA:
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if (smd_read_avail(smd_xprtp->channel))
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queue_delayed_work(smd_xprtp->smd_xprt_wq,
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&smd_xprtp->read_work, 0);
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if (smd_write_segment_avail(smd_xprtp->channel))
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wake_up(&smd_xprtp->write_avail_wait_q);
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break;
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case SMD_EVENT_OPEN:
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xprt_work = kmalloc(sizeof(struct msm_ipc_router_smd_xprt_work),
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GFP_ATOMIC);
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if (!xprt_work) {
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pr_err("%s: Couldn't notify %d event to IPC Router\n",
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__func__, event);
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return;
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}
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xprt_work->xprt = &smd_xprtp->xprt;
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INIT_WORK(&xprt_work->work, smd_xprt_open_event);
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queue_work(smd_xprtp->smd_xprt_wq, &xprt_work->work);
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break;
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case SMD_EVENT_CLOSE:
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spin_lock_irqsave(&smd_xprtp->ss_reset_lock, flags);
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smd_xprtp->ss_reset = 1;
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spin_unlock_irqrestore(&smd_xprtp->ss_reset_lock, flags);
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wake_up(&smd_xprtp->write_avail_wait_q);
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xprt_work = kmalloc(sizeof(struct msm_ipc_router_smd_xprt_work),
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GFP_ATOMIC);
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if (!xprt_work) {
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pr_err("%s: Couldn't notify %d event to IPC Router\n",
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__func__, event);
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return;
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}
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xprt_work->xprt = &smd_xprtp->xprt;
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INIT_WORK(&xprt_work->work, smd_xprt_close_event);
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queue_work(smd_xprtp->smd_xprt_wq, &xprt_work->work);
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break;
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}
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}
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static void *msm_ipc_load_subsystem(uint32_t edge)
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{
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void *pil = NULL;
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const char *peripheral;
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peripheral = smd_edge_to_subsystem(edge);
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if (peripheral) {
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pil = subsystem_get(peripheral);
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if (IS_ERR(pil)) {
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pr_err("%s: Failed to load %s\n",
|
|
__func__, peripheral);
|
|
pil = NULL;
|
|
}
|
|
}
|
|
return pil;
|
|
}
|
|
|
|
static int msm_ipc_router_smd_remote_probe(struct platform_device *pdev)
|
|
{
|
|
int rc;
|
|
int id; /*Index into the smd_xprt_cfg table*/
|
|
|
|
id = find_smd_xprt_cfg(pdev);
|
|
if (id < 0) {
|
|
pr_err("%s: called for unknown ch %s\n",
|
|
__func__, pdev->name);
|
|
return id;
|
|
}
|
|
|
|
smd_remote_xprt[id].smd_xprt_wq =
|
|
create_singlethread_workqueue(pdev->name);
|
|
if (!smd_remote_xprt[id].smd_xprt_wq) {
|
|
pr_err("%s: WQ creation failed for %s\n",
|
|
__func__, pdev->name);
|
|
return -EFAULT;
|
|
}
|
|
|
|
smd_remote_xprt[id].xprt.name = smd_xprt_cfg[id].xprt_name;
|
|
smd_remote_xprt[id].xprt.link_id = smd_xprt_cfg[id].link_id;
|
|
smd_remote_xprt[id].xprt.get_version =
|
|
msm_ipc_router_smd_get_xprt_version;
|
|
smd_remote_xprt[id].xprt.get_option =
|
|
msm_ipc_router_smd_get_xprt_option;
|
|
smd_remote_xprt[id].xprt.read_avail = NULL;
|
|
smd_remote_xprt[id].xprt.read = NULL;
|
|
smd_remote_xprt[id].xprt.write_avail =
|
|
msm_ipc_router_smd_remote_write_avail;
|
|
smd_remote_xprt[id].xprt.write = msm_ipc_router_smd_remote_write;
|
|
smd_remote_xprt[id].xprt.close = msm_ipc_router_smd_remote_close;
|
|
smd_remote_xprt[id].xprt.sft_close_done = smd_xprt_sft_close_done;
|
|
smd_remote_xprt[id].xprt.priv = NULL;
|
|
|
|
init_waitqueue_head(&smd_remote_xprt[id].write_avail_wait_q);
|
|
smd_remote_xprt[id].in_pkt = NULL;
|
|
smd_remote_xprt[id].is_partial_in_pkt = 0;
|
|
INIT_DELAYED_WORK(&smd_remote_xprt[id].read_work, smd_xprt_read_data);
|
|
spin_lock_init(&smd_remote_xprt[id].ss_reset_lock);
|
|
smd_remote_xprt[id].ss_reset = 0;
|
|
smd_remote_xprt[id].xprt_version = smd_xprt_cfg[id].xprt_version;
|
|
smd_remote_xprt[id].xprt_option = FRAG_PKT_WRITE_ENABLE;
|
|
|
|
smd_remote_xprt[id].pil = msm_ipc_load_subsystem(
|
|
smd_xprt_cfg[id].edge);
|
|
rc = smd_named_open_on_edge(smd_xprt_cfg[id].ch_name,
|
|
smd_xprt_cfg[id].edge,
|
|
&smd_remote_xprt[id].channel,
|
|
&smd_remote_xprt[id],
|
|
msm_ipc_router_smd_remote_notify);
|
|
if (rc < 0) {
|
|
pr_err("%s: Channel open failed for %s\n",
|
|
__func__, smd_xprt_cfg[id].ch_name);
|
|
if (smd_remote_xprt[id].pil) {
|
|
subsystem_put(smd_remote_xprt[id].pil);
|
|
smd_remote_xprt[id].pil = NULL;
|
|
}
|
|
destroy_workqueue(smd_remote_xprt[id].smd_xprt_wq);
|
|
return rc;
|
|
}
|
|
|
|
smd_disable_read_intr(smd_remote_xprt[id].channel);
|
|
|
|
smsm_change_state(SMSM_APPS_STATE, 0, SMSM_RPCINIT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void *msm_ipc_load_default_node(void)
|
|
{
|
|
void *pil = NULL;
|
|
const char *peripheral;
|
|
|
|
peripheral = smd_edge_to_subsystem(SMD_APPS_MODEM);
|
|
if (peripheral && !strncmp(peripheral, "modem", 6)) {
|
|
pil = subsystem_get(peripheral);
|
|
if (IS_ERR(pil)) {
|
|
pr_err("%s: Failed to load %s\n",
|
|
__func__, peripheral);
|
|
pil = NULL;
|
|
}
|
|
}
|
|
return pil;
|
|
}
|
|
EXPORT_SYMBOL(msm_ipc_load_default_node);
|
|
|
|
void msm_ipc_unload_default_node(void *pil)
|
|
{
|
|
if (pil)
|
|
subsystem_put(pil);
|
|
}
|
|
EXPORT_SYMBOL(msm_ipc_unload_default_node);
|
|
|
|
static struct platform_driver msm_ipc_router_smd_remote_driver[] = {
|
|
{
|
|
.probe = msm_ipc_router_smd_remote_probe,
|
|
.driver = {
|
|
.name = "RPCRPY_CNTL",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
},
|
|
{
|
|
.probe = msm_ipc_router_smd_remote_probe,
|
|
.driver = {
|
|
.name = "IPCRTR",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
},
|
|
};
|
|
|
|
static int __init msm_ipc_router_smd_init(void)
|
|
{
|
|
int i, ret, rc = 0;
|
|
BUG_ON(ARRAY_SIZE(smd_xprt_cfg) != NUM_SMD_XPRTS);
|
|
for (i = 0; i < ARRAY_SIZE(msm_ipc_router_smd_remote_driver); i++) {
|
|
ret = platform_driver_register(
|
|
&msm_ipc_router_smd_remote_driver[i]);
|
|
if (ret) {
|
|
pr_err("%s: Failed to register platform driver for"
|
|
" xprt%d. Continuing...\n", __func__, i);
|
|
rc = ret;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
module_init(msm_ipc_router_smd_init);
|
|
MODULE_DESCRIPTION("IPC Router SMD XPRT");
|
|
MODULE_LICENSE("GPL v2");
|