Commit f6f9279f authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Greg Kroah-Hartman

misc: fastrpc: Add Qualcomm fastrpc basic driver model

This patch adds basic driver model for Qualcomm FastRPC driver which
implements an IPC (Inter-Processor Communication) mechanism that
allows for clients to transparently make remote method invocations
across processor boundaries.

Each DSP rpmsg channel is represented as fastrpc channel context and
is exposed as a character device for userspace interface.
Each compute context bank is represented as fastrpc-session-context,
which are dynamically managed by the channel context char device.
Co-developed-by: default avatarThierry Escande <thierry.escande@linaro.org>
Signed-off-by: default avatarThierry Escande <thierry.escande@linaro.org>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 36e738bd
......@@ -295,6 +295,16 @@ config QCOM_COINCELL
to maintain PMIC register and RTC state in the absence of
external power.
config QCOM_FASTRPC
tristate "Qualcomm FastRPC"
depends on ARCH_QCOM || COMPILE_TEST
depends on RPMSG
help
Provides a communication mechanism that allows for clients to
make remote method invocations across processor boundary to
applications DSP processor. Say M if you want to enable this
module.
config SGI_GRU
tristate "SGI GRU driver"
depends on X86_UV && SMP
......
......@@ -18,6 +18,7 @@ obj-$(CONFIG_TIFM_CORE) += tifm_core.o
obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o
obj-$(CONFIG_PHANTOM) += phantom.o
obj-$(CONFIG_QCOM_COINCELL) += qcom-coincell.o
obj-$(CONFIG_QCOM_FASTRPC) += fastrpc.o
obj-$(CONFIG_SENSORS_BH1770) += bh1770glc.o
obj-$(CONFIG_SENSORS_APDS990X) += apds990x.o
obj-$(CONFIG_SGI_IOC4) += ioc4.o
......
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2011-2018, The Linux Foundation. All rights reserved.
// Copyright (c) 2018, Linaro Limited
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/idr.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/rpmsg.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#define ADSP_DOMAIN_ID (0)
#define MDSP_DOMAIN_ID (1)
#define SDSP_DOMAIN_ID (2)
#define CDSP_DOMAIN_ID (3)
#define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/
#define FASTRPC_MAX_SESSIONS 9 /*8 compute, 1 cpz*/
#define FASTRPC_CTX_MAX (256)
#define FASTRPC_CTXID_MASK (0xFF0)
#define FASTRPC_DEVICE_NAME "fastrpc"
#define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)
static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
"sdsp", "cdsp"};
struct fastrpc_session_ctx {
struct device *dev;
int sid;
bool used;
bool valid;
};
struct fastrpc_channel_ctx {
int domain_id;
int sesscount;
struct rpmsg_device *rpdev;
struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
spinlock_t lock;
struct idr ctx_idr;
struct list_head users;
struct miscdevice miscdev;
};
struct fastrpc_user {
struct list_head user;
struct list_head maps;
struct list_head pending;
struct fastrpc_channel_ctx *cctx;
struct fastrpc_session_ctx *sctx;
int tgid;
int pd;
/* Lock for lists */
spinlock_t lock;
/* lock for allocations */
struct mutex mutex;
};
static struct fastrpc_session_ctx *fastrpc_session_alloc(
struct fastrpc_channel_ctx *cctx)
{
struct fastrpc_session_ctx *session = NULL;
int i;
spin_lock(&cctx->lock);
for (i = 0; i < cctx->sesscount; i++) {
if (!cctx->session[i].used && cctx->session[i].valid) {
cctx->session[i].used = true;
session = &cctx->session[i];
break;
}
}
spin_unlock(&cctx->lock);
return session;
}
static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
struct fastrpc_session_ctx *session)
{
spin_lock(&cctx->lock);
session->used = false;
spin_unlock(&cctx->lock);
}
static int fastrpc_device_release(struct inode *inode, struct file *file)
{
struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
struct fastrpc_channel_ctx *cctx = fl->cctx;
spin_lock(&cctx->lock);
list_del(&fl->user);
spin_unlock(&cctx->lock);
fastrpc_session_free(cctx, fl->sctx);
mutex_destroy(&fl->mutex);
kfree(fl);
file->private_data = NULL;
return 0;
}
static int fastrpc_device_open(struct inode *inode, struct file *filp)
{
struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
struct fastrpc_user *fl = NULL;
fl = kzalloc(sizeof(*fl), GFP_KERNEL);
if (!fl)
return -ENOMEM;
filp->private_data = fl;
spin_lock_init(&fl->lock);
mutex_init(&fl->mutex);
INIT_LIST_HEAD(&fl->pending);
INIT_LIST_HEAD(&fl->maps);
INIT_LIST_HEAD(&fl->user);
fl->tgid = current->tgid;
fl->cctx = cctx;
spin_lock(&cctx->lock);
list_add_tail(&fl->user, &cctx->users);
spin_unlock(&cctx->lock);
fl->sctx = fastrpc_session_alloc(cctx);
return 0;
}
static const struct file_operations fastrpc_fops = {
.open = fastrpc_device_open,
.release = fastrpc_device_release,
};
static int fastrpc_cb_probe(struct platform_device *pdev)
{
struct fastrpc_channel_ctx *cctx;
struct fastrpc_session_ctx *sess;
struct device *dev = &pdev->dev;
int i, sessions = 0;
cctx = dev_get_drvdata(dev->parent);
if (!cctx)
return -EINVAL;
of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
spin_lock(&cctx->lock);
sess = &cctx->session[cctx->sesscount];
sess->used = false;
sess->valid = true;
sess->dev = dev;
dev_set_drvdata(dev, sess);
if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
dev_info(dev, "FastRPC Session ID not specified in DT\n");
if (sessions > 0) {
struct fastrpc_session_ctx *dup_sess;
for (i = 1; i < sessions; i++) {
if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
break;
dup_sess = &cctx->session[cctx->sesscount];
memcpy(dup_sess, sess, sizeof(*dup_sess));
}
}
cctx->sesscount++;
spin_unlock(&cctx->lock);
dma_set_mask(dev, DMA_BIT_MASK(32));
return 0;
}
static int fastrpc_cb_remove(struct platform_device *pdev)
{
struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
int i;
spin_lock(&cctx->lock);
for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
if (cctx->session[i].sid == sess->sid) {
cctx->session[i].valid = false;
cctx->sesscount--;
}
}
spin_unlock(&cctx->lock);
return 0;
}
static const struct of_device_id fastrpc_match_table[] = {
{ .compatible = "qcom,fastrpc-compute-cb", },
{}
};
static struct platform_driver fastrpc_cb_driver = {
.probe = fastrpc_cb_probe,
.remove = fastrpc_cb_remove,
.driver = {
.name = "qcom,fastrpc-cb",
.of_match_table = fastrpc_match_table,
.suppress_bind_attrs = true,
},
};
static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
{
struct device *rdev = &rpdev->dev;
struct fastrpc_channel_ctx *data;
int i, err, domain_id = -1;
const char *domain;
data = devm_kzalloc(rdev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
err = of_property_read_string(rdev->of_node, "label", &domain);
if (err) {
dev_info(rdev, "FastRPC Domain not specified in DT\n");
return err;
}
for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
if (!strcmp(domains[i], domain)) {
domain_id = i;
break;
}
}
if (domain_id < 0) {
dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
return -EINVAL;
}
data->miscdev.minor = MISC_DYNAMIC_MINOR;
data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s",
domains[domain_id]);
data->miscdev.fops = &fastrpc_fops;
err = misc_register(&data->miscdev);
if (err)
return err;
dev_set_drvdata(&rpdev->dev, data);
dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
INIT_LIST_HEAD(&data->users);
spin_lock_init(&data->lock);
idr_init(&data->ctx_idr);
data->domain_id = domain_id;
data->rpdev = rpdev;
return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
}
static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
{
struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
misc_deregister(&cctx->miscdev);
of_platform_depopulate(&rpdev->dev);
kfree(cctx);
}
static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
int len, void *priv, u32 addr)
{
return 0;
}
static const struct of_device_id fastrpc_rpmsg_of_match[] = {
{ .compatible = "qcom,fastrpc" },
{ },
};
MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
static struct rpmsg_driver fastrpc_driver = {
.probe = fastrpc_rpmsg_probe,
.remove = fastrpc_rpmsg_remove,
.callback = fastrpc_rpmsg_callback,
.drv = {
.name = "qcom,fastrpc",
.of_match_table = fastrpc_rpmsg_of_match,
},
};
static int fastrpc_init(void)
{
int ret;
ret = platform_driver_register(&fastrpc_cb_driver);
if (ret < 0) {
pr_err("fastrpc: failed to register cb driver\n");
return ret;
}
ret = register_rpmsg_driver(&fastrpc_driver);
if (ret < 0) {
pr_err("fastrpc: failed to register rpmsg driver\n");
platform_driver_unregister(&fastrpc_cb_driver);
return ret;
}
return 0;
}
module_init(fastrpc_init);
static void fastrpc_exit(void)
{
platform_driver_unregister(&fastrpc_cb_driver);
unregister_rpmsg_driver(&fastrpc_driver);
}
module_exit(fastrpc_exit);
MODULE_LICENSE("GPL v2");
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