forked from Minki/linux
8347356626
Use PDR helper functions to track the protection domains that the apr services are dependent upon on SDM845 SoC, specifically the "avs/audio" service running on ADSP Q6. Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Link: https://lore.kernel.org/r/20200312120842.21991-4-sibis@codeaurora.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
548 lines
13 KiB
C
548 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
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// Copyright (c) 2018, Linaro Limited
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/of_device.h>
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#include <linux/soc/qcom/apr.h>
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#include <linux/soc/qcom/pdr.h>
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#include <linux/rpmsg.h>
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#include <linux/of.h>
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struct apr {
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struct rpmsg_endpoint *ch;
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struct device *dev;
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spinlock_t svcs_lock;
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spinlock_t rx_lock;
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struct idr svcs_idr;
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int dest_domain_id;
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struct pdr_handle *pdr;
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struct workqueue_struct *rxwq;
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struct work_struct rx_work;
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struct list_head rx_list;
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};
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struct apr_rx_buf {
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struct list_head node;
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int len;
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uint8_t buf[];
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};
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/**
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* apr_send_pkt() - Send a apr message from apr device
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*
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* @adev: Pointer to previously registered apr device.
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* @pkt: Pointer to apr packet to send
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*
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* Return: Will be an negative on packet size on success.
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*/
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int apr_send_pkt(struct apr_device *adev, struct apr_pkt *pkt)
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{
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struct apr *apr = dev_get_drvdata(adev->dev.parent);
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struct apr_hdr *hdr;
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&adev->lock, flags);
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hdr = &pkt->hdr;
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hdr->src_domain = APR_DOMAIN_APPS;
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hdr->src_svc = adev->svc_id;
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hdr->dest_domain = adev->domain_id;
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hdr->dest_svc = adev->svc_id;
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ret = rpmsg_trysend(apr->ch, pkt, hdr->pkt_size);
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spin_unlock_irqrestore(&adev->lock, flags);
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return ret ? ret : hdr->pkt_size;
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}
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EXPORT_SYMBOL_GPL(apr_send_pkt);
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static void apr_dev_release(struct device *dev)
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{
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struct apr_device *adev = to_apr_device(dev);
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kfree(adev);
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}
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static int apr_callback(struct rpmsg_device *rpdev, void *buf,
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int len, void *priv, u32 addr)
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{
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struct apr *apr = dev_get_drvdata(&rpdev->dev);
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struct apr_rx_buf *abuf;
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unsigned long flags;
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if (len <= APR_HDR_SIZE) {
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dev_err(apr->dev, "APR: Improper apr pkt received:%p %d\n",
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buf, len);
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return -EINVAL;
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}
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abuf = kzalloc(sizeof(*abuf) + len, GFP_ATOMIC);
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if (!abuf)
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return -ENOMEM;
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abuf->len = len;
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memcpy(abuf->buf, buf, len);
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spin_lock_irqsave(&apr->rx_lock, flags);
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list_add_tail(&abuf->node, &apr->rx_list);
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spin_unlock_irqrestore(&apr->rx_lock, flags);
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queue_work(apr->rxwq, &apr->rx_work);
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return 0;
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}
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static int apr_do_rx_callback(struct apr *apr, struct apr_rx_buf *abuf)
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{
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uint16_t hdr_size, msg_type, ver, svc_id;
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struct apr_device *svc = NULL;
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struct apr_driver *adrv = NULL;
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struct apr_resp_pkt resp;
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struct apr_hdr *hdr;
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unsigned long flags;
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void *buf = abuf->buf;
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int len = abuf->len;
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hdr = buf;
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ver = APR_HDR_FIELD_VER(hdr->hdr_field);
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if (ver > APR_PKT_VER + 1)
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return -EINVAL;
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hdr_size = APR_HDR_FIELD_SIZE_BYTES(hdr->hdr_field);
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if (hdr_size < APR_HDR_SIZE) {
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dev_err(apr->dev, "APR: Wrong hdr size:%d\n", hdr_size);
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return -EINVAL;
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}
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if (hdr->pkt_size < APR_HDR_SIZE || hdr->pkt_size != len) {
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dev_err(apr->dev, "APR: Wrong packet size\n");
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return -EINVAL;
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}
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msg_type = APR_HDR_FIELD_MT(hdr->hdr_field);
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if (msg_type >= APR_MSG_TYPE_MAX) {
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dev_err(apr->dev, "APR: Wrong message type: %d\n", msg_type);
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return -EINVAL;
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}
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if (hdr->src_domain >= APR_DOMAIN_MAX ||
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hdr->dest_domain >= APR_DOMAIN_MAX ||
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hdr->src_svc >= APR_SVC_MAX ||
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hdr->dest_svc >= APR_SVC_MAX) {
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dev_err(apr->dev, "APR: Wrong APR header\n");
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return -EINVAL;
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}
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svc_id = hdr->dest_svc;
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spin_lock_irqsave(&apr->svcs_lock, flags);
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svc = idr_find(&apr->svcs_idr, svc_id);
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if (svc && svc->dev.driver)
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adrv = to_apr_driver(svc->dev.driver);
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spin_unlock_irqrestore(&apr->svcs_lock, flags);
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if (!adrv) {
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dev_err(apr->dev, "APR: service is not registered\n");
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return -EINVAL;
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}
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resp.hdr = *hdr;
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resp.payload_size = hdr->pkt_size - hdr_size;
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/*
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* NOTE: hdr_size is not same as APR_HDR_SIZE as remote can include
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* optional headers in to apr_hdr which should be ignored
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*/
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if (resp.payload_size > 0)
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resp.payload = buf + hdr_size;
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adrv->callback(svc, &resp);
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return 0;
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}
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static void apr_rxwq(struct work_struct *work)
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{
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struct apr *apr = container_of(work, struct apr, rx_work);
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struct apr_rx_buf *abuf, *b;
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unsigned long flags;
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if (!list_empty(&apr->rx_list)) {
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list_for_each_entry_safe(abuf, b, &apr->rx_list, node) {
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apr_do_rx_callback(apr, abuf);
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spin_lock_irqsave(&apr->rx_lock, flags);
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list_del(&abuf->node);
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spin_unlock_irqrestore(&apr->rx_lock, flags);
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kfree(abuf);
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}
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}
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}
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static int apr_device_match(struct device *dev, struct device_driver *drv)
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{
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struct apr_device *adev = to_apr_device(dev);
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struct apr_driver *adrv = to_apr_driver(drv);
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const struct apr_device_id *id = adrv->id_table;
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/* Attempt an OF style match first */
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if (of_driver_match_device(dev, drv))
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return 1;
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if (!id)
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return 0;
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while (id->domain_id != 0 || id->svc_id != 0) {
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if (id->domain_id == adev->domain_id &&
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id->svc_id == adev->svc_id)
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return 1;
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id++;
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}
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return 0;
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}
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static int apr_device_probe(struct device *dev)
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{
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struct apr_device *adev = to_apr_device(dev);
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struct apr_driver *adrv = to_apr_driver(dev->driver);
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return adrv->probe(adev);
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}
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static int apr_device_remove(struct device *dev)
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{
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struct apr_device *adev = to_apr_device(dev);
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struct apr_driver *adrv;
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struct apr *apr = dev_get_drvdata(adev->dev.parent);
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if (dev->driver) {
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adrv = to_apr_driver(dev->driver);
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if (adrv->remove)
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adrv->remove(adev);
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spin_lock(&apr->svcs_lock);
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idr_remove(&apr->svcs_idr, adev->svc_id);
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spin_unlock(&apr->svcs_lock);
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}
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return 0;
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}
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static int apr_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct apr_device *adev = to_apr_device(dev);
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int ret;
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ret = of_device_uevent_modalias(dev, env);
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if (ret != -ENODEV)
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return ret;
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return add_uevent_var(env, "MODALIAS=apr:%s", adev->name);
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}
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struct bus_type aprbus = {
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.name = "aprbus",
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.match = apr_device_match,
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.probe = apr_device_probe,
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.uevent = apr_uevent,
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.remove = apr_device_remove,
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};
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EXPORT_SYMBOL_GPL(aprbus);
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static int apr_add_device(struct device *dev, struct device_node *np,
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const struct apr_device_id *id)
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{
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struct apr *apr = dev_get_drvdata(dev);
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struct apr_device *adev = NULL;
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int ret;
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adev = kzalloc(sizeof(*adev), GFP_KERNEL);
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if (!adev)
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return -ENOMEM;
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spin_lock_init(&adev->lock);
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adev->svc_id = id->svc_id;
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adev->domain_id = id->domain_id;
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adev->version = id->svc_version;
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if (np)
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snprintf(adev->name, APR_NAME_SIZE, "%pOFn", np);
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else
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strscpy(adev->name, id->name, APR_NAME_SIZE);
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dev_set_name(&adev->dev, "aprsvc:%s:%x:%x", adev->name,
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id->domain_id, id->svc_id);
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adev->dev.bus = &aprbus;
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adev->dev.parent = dev;
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adev->dev.of_node = np;
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adev->dev.release = apr_dev_release;
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adev->dev.driver = NULL;
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spin_lock(&apr->svcs_lock);
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idr_alloc(&apr->svcs_idr, adev, id->svc_id,
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id->svc_id + 1, GFP_ATOMIC);
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spin_unlock(&apr->svcs_lock);
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of_property_read_string_index(np, "qcom,protection-domain",
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1, &adev->service_path);
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dev_info(dev, "Adding APR dev: %s\n", dev_name(&adev->dev));
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ret = device_register(&adev->dev);
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if (ret) {
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dev_err(dev, "device_register failed: %d\n", ret);
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put_device(&adev->dev);
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}
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return ret;
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}
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static int of_apr_add_pd_lookups(struct device *dev)
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{
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const char *service_name, *service_path;
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struct apr *apr = dev_get_drvdata(dev);
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struct device_node *node;
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struct pdr_service *pds;
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int ret;
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for_each_child_of_node(dev->of_node, node) {
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ret = of_property_read_string_index(node, "qcom,protection-domain",
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0, &service_name);
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if (ret < 0)
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continue;
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ret = of_property_read_string_index(node, "qcom,protection-domain",
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1, &service_path);
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if (ret < 0) {
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dev_err(dev, "pdr service path missing: %d\n", ret);
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return ret;
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}
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pds = pdr_add_lookup(apr->pdr, service_name, service_path);
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if (IS_ERR(pds) && PTR_ERR(pds) != -EALREADY) {
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dev_err(dev, "pdr add lookup failed: %d\n", ret);
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return PTR_ERR(pds);
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}
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}
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return 0;
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}
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static void of_register_apr_devices(struct device *dev, const char *svc_path)
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{
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struct apr *apr = dev_get_drvdata(dev);
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struct device_node *node;
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const char *service_path;
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int ret;
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for_each_child_of_node(dev->of_node, node) {
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struct apr_device_id id = { {0} };
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/*
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* This function is called with svc_path NULL during
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* apr_probe(), in which case we register any apr devices
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* without a qcom,protection-domain specified.
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*
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* Then as the protection domains becomes available
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* (if applicable) this function is again called, but with
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* svc_path representing the service becoming available. In
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* this case we register any apr devices with a matching
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* qcom,protection-domain.
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*/
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ret = of_property_read_string_index(node, "qcom,protection-domain",
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1, &service_path);
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if (svc_path) {
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/* skip APR services that are PD independent */
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if (ret)
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continue;
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/* skip APR services whose PD paths don't match */
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if (strcmp(service_path, svc_path))
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continue;
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} else {
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/* skip APR services whose PD lookups are registered */
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if (ret == 0)
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continue;
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}
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if (of_property_read_u32(node, "reg", &id.svc_id))
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continue;
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id.domain_id = apr->dest_domain_id;
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if (apr_add_device(dev, node, &id))
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dev_err(dev, "Failed to add apr %d svc\n", id.svc_id);
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}
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}
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static int apr_remove_device(struct device *dev, void *svc_path)
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{
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struct apr_device *adev = to_apr_device(dev);
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if (svc_path && adev->service_path) {
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if (!strcmp(adev->service_path, (char *)svc_path))
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device_unregister(&adev->dev);
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} else {
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device_unregister(&adev->dev);
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}
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return 0;
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}
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static void apr_pd_status(int state, char *svc_path, void *priv)
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{
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struct apr *apr = (struct apr *)priv;
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switch (state) {
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case SERVREG_SERVICE_STATE_UP:
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of_register_apr_devices(apr->dev, svc_path);
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break;
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case SERVREG_SERVICE_STATE_DOWN:
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device_for_each_child(apr->dev, svc_path, apr_remove_device);
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break;
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}
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}
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static int apr_probe(struct rpmsg_device *rpdev)
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{
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struct device *dev = &rpdev->dev;
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struct apr *apr;
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int ret;
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apr = devm_kzalloc(dev, sizeof(*apr), GFP_KERNEL);
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if (!apr)
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return -ENOMEM;
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ret = of_property_read_u32(dev->of_node, "qcom,apr-domain", &apr->dest_domain_id);
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if (ret) {
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dev_err(dev, "APR Domain ID not specified in DT\n");
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return ret;
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}
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dev_set_drvdata(dev, apr);
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apr->ch = rpdev->ept;
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apr->dev = dev;
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apr->rxwq = create_singlethread_workqueue("qcom_apr_rx");
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if (!apr->rxwq) {
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dev_err(apr->dev, "Failed to start Rx WQ\n");
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return -ENOMEM;
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}
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INIT_WORK(&apr->rx_work, apr_rxwq);
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apr->pdr = pdr_handle_alloc(apr_pd_status, apr);
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if (IS_ERR(apr->pdr)) {
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dev_err(dev, "Failed to init PDR handle\n");
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ret = PTR_ERR(apr->pdr);
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goto destroy_wq;
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}
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INIT_LIST_HEAD(&apr->rx_list);
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spin_lock_init(&apr->rx_lock);
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spin_lock_init(&apr->svcs_lock);
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idr_init(&apr->svcs_idr);
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ret = of_apr_add_pd_lookups(dev);
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if (ret)
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goto handle_release;
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of_register_apr_devices(dev, NULL);
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return 0;
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handle_release:
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pdr_handle_release(apr->pdr);
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destroy_wq:
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destroy_workqueue(apr->rxwq);
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return ret;
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}
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static void apr_remove(struct rpmsg_device *rpdev)
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{
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struct apr *apr = dev_get_drvdata(&rpdev->dev);
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pdr_handle_release(apr->pdr);
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device_for_each_child(&rpdev->dev, NULL, apr_remove_device);
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flush_workqueue(apr->rxwq);
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destroy_workqueue(apr->rxwq);
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}
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/*
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* __apr_driver_register() - Client driver registration with aprbus
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*
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* @drv:Client driver to be associated with client-device.
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* @owner: owning module/driver
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*
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* This API will register the client driver with the aprbus
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* It is called from the driver's module-init function.
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*/
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int __apr_driver_register(struct apr_driver *drv, struct module *owner)
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{
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drv->driver.bus = &aprbus;
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drv->driver.owner = owner;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(__apr_driver_register);
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/*
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* apr_driver_unregister() - Undo effect of apr_driver_register
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*
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* @drv: Client driver to be unregistered
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*/
|
|
void apr_driver_unregister(struct apr_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(apr_driver_unregister);
|
|
|
|
static const struct of_device_id apr_of_match[] = {
|
|
{ .compatible = "qcom,apr"},
|
|
{ .compatible = "qcom,apr-v2"},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, apr_of_match);
|
|
|
|
static struct rpmsg_driver apr_driver = {
|
|
.probe = apr_probe,
|
|
.remove = apr_remove,
|
|
.callback = apr_callback,
|
|
.drv = {
|
|
.name = "qcom,apr",
|
|
.of_match_table = apr_of_match,
|
|
},
|
|
};
|
|
|
|
static int __init apr_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = bus_register(&aprbus);
|
|
if (!ret)
|
|
ret = register_rpmsg_driver(&apr_driver);
|
|
else
|
|
bus_unregister(&aprbus);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit apr_exit(void)
|
|
{
|
|
bus_unregister(&aprbus);
|
|
unregister_rpmsg_driver(&apr_driver);
|
|
}
|
|
|
|
subsys_initcall(apr_init);
|
|
module_exit(apr_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Qualcomm APR Bus");
|