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Subject[PATCH v2 4/6] misc: fastrpc: Add support for create remote init process
Date
This patch adds support to create or attach remote shell process.
The shell process called fastrpc_shell_0 is usually loaded on the DSP
when a user process is spawned.

Most of the work is derived from various downstream Qualcomm kernels.
Credits to various Qualcomm authors who have contributed to this code.
Specially Tharun Kumar Merugu <mtharu@codeaurora.org>

Co-developed-by: Thierry Escande <thierry.escande@linaro.org>
Signed-off-by: Thierry Escande <thierry.escande@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/misc/fastrpc.c | 140 ++++++++++++++++++++++++++++++++++++
include/uapi/misc/fastrpc.h | 12 ++++
2 files changed, 152 insertions(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 46435813785d..fda674e9efe2 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -29,7 +29,10 @@
#define FASTRPC_MAX_CRCLIST 64
#define FASTRPC_PHYS(p) ((p) & 0xffffffff)
#define FASTRPC_CTX_MAX (256)
+#define FASTRPC_INIT_HANDLE 1
#define FASTRPC_CTXID_MASK (0xFF0)
+#define INIT_FILELEN_MAX (2 * 1024 * 1024)
+#define INIT_MEMLEN_MAX (8 * 1024 * 1024)
#define FASTRPC_DEVICE_NAME "fastrpc"

/* Retrives number of input buffers from the scalars parameter */
@@ -60,6 +63,13 @@
#define FASTRPC_SCALARS(method, in, out) \
FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)

+/* Remote Method id table */
+#define FASTRPC_RMID_INIT_ATTACH 0
+#define FASTRPC_RMID_INIT_RELEASE 1
+#define FASTRPC_RMID_INIT_CREATE 6
+#define FASTRPC_RMID_INIT_CREATE_ATTR 7
+#define FASTRPC_RMID_INIT_CREATE_STATIC 8
+
#define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)

static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
@@ -676,6 +686,94 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl,
return err;
}

+static long fastrpc_init_create_process(struct fastrpc_user *fl,
+ char __user *argp)
+{
+ struct fastrpc_init_create init;
+ struct fastrpc_invoke_args args[6];
+ struct fastrpc_phy_page pages[1];
+ struct fastrpc_invoke inv;
+ struct fastrpc_map *map = NULL;
+ struct fastrpc_buf *imem = NULL;
+ int err, memlen;
+ struct {
+ int pgid;
+ unsigned int namelen;
+ unsigned int filelen;
+ unsigned int pageslen;
+ int attrs;
+ int siglen;
+ } inbuf;
+
+ err = copy_from_user(&init, argp, sizeof(init));
+ if (err)
+ goto bail;
+
+ if (init.filelen > INIT_FILELEN_MAX ||
+ init.memlen > INIT_MEMLEN_MAX)
+ goto bail;
+
+ inbuf.pgid = fl->tgid;
+ inbuf.namelen = strlen(current->comm) + 1;
+ inbuf.filelen = init.filelen;
+ inbuf.pageslen = 1;
+ inbuf.attrs = init.attrs;
+ inbuf.siglen = init.siglen;
+ fl->pd = 1;
+
+ if (init.filelen && init.filefd) {
+ err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
+ if (err)
+ goto bail;
+ }
+ memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
+ 1024 * 1024);
+ err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
+ &imem);
+ if (err)
+ goto bail;
+
+ fl->init_mem = imem;
+ args[0].ptr = &inbuf;
+ args[0].length = sizeof(inbuf);
+ args[0].fd = -1;
+
+ args[1].ptr = current->comm;
+ args[1].length = inbuf.namelen;
+ args[1].fd = -1;
+
+ args[2].ptr = (void *)init.file;
+ args[2].length = inbuf.filelen;
+ args[2].fd = init.filefd;
+
+ pages[0].addr = imem->phys;
+ pages[0].size = imem->size;
+
+ args[3].ptr = pages;
+ args[3].length = 1 * sizeof(*pages);
+ args[3].fd = -1;
+
+ args[4].ptr = &inbuf.attrs;
+ args[4].length = sizeof(inbuf.attrs);
+ args[4].fd = -1;
+
+ args[5].ptr = &inbuf.siglen;
+ args[5].length = sizeof(inbuf.siglen);
+ args[5].fd = -1;
+
+ inv.handle = 1;
+ inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
+ if (init.attrs)
+ inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
+ inv.args = &args[0];
+ err = fastrpc_internal_invoke(fl, 1, &inv);
+bail:
+ if (map)
+ fastrpc_map_put(map);
+
+ return err;
+}
+
static struct fastrpc_session_ctx *fastrpc_session_alloc(
struct fastrpc_channel_ctx *cctx,
int secure)
@@ -705,6 +803,23 @@ static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
spin_unlock(&cctx->lock);
}

+static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
+{
+ struct fastrpc_invoke inv;
+ struct fastrpc_invoke_args args[1];
+ int tgid = 0;
+
+ tgid = fl->tgid;
+ args[0].ptr = &tgid;
+ args[0].length = sizeof(tgid);
+ args[0].fd = -1;
+ inv.handle = 1;
+ inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
+ inv.args = &args[0];
+
+ return fastrpc_internal_invoke(fl, 1, &inv);
+}
+
static int fastrpc_device_release(struct inode *inode, struct file *file)
{
struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
@@ -712,6 +827,8 @@ static int fastrpc_device_release(struct inode *inode, struct file *file)
struct fastrpc_invoke_ctx *ctx, *n;
struct fastrpc_map *map, *m;

+ fastrpc_release_current_dsp_process(fl);
+
spin_lock(&cctx->lock);
list_del(&fl->user);
spin_unlock(&cctx->lock);
@@ -759,6 +876,23 @@ static int fastrpc_device_open(struct inode *inode, struct file *filp)
return 0;
}

+static long fastrpc_init_attach(struct fastrpc_user *fl)
+{
+ struct fastrpc_invoke_args args[1];
+ struct fastrpc_invoke inv;
+ int tgid = fl->tgid;
+
+ args[0].ptr = &tgid;
+ args[0].length = sizeof(tgid);
+ args[0].fd = -1;
+ inv.handle = FASTRPC_INIT_HANDLE;
+ inv.sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
+ inv.args = &args[0];
+ fl->pd = 0;
+
+ return fastrpc_internal_invoke(fl, 1, &inv);
+}
+
static long fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
{
struct fastrpc_invoke_args *args = NULL;
@@ -799,6 +933,12 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
case FASTRPC_IOCTL_INVOKE:
err = fastrpc_invoke(fl, argp);
break;
+ case FASTRPC_IOCTL_INIT_ATTACH:
+ err = fastrpc_init_attach(fl);
+ break;
+ case FASTRPC_IOCTL_INIT_CREATE:
+ err = fastrpc_init_create_process(fl, argp);
+ break;
default:
err = -ENOTTY;
dev_err(fl->sctx->dev, "bad ioctl: %d\n", cmd);
diff --git a/include/uapi/misc/fastrpc.h b/include/uapi/misc/fastrpc.h
index 0b408ba62482..2f0afa5dab1f 100644
--- a/include/uapi/misc/fastrpc.h
+++ b/include/uapi/misc/fastrpc.h
@@ -6,6 +6,8 @@
#include <linux/types.h>

#define FASTRPC_IOCTL_INVOKE _IOWR('R', 3, struct fastrpc_invoke)
+#define FASTRPC_IOCTL_INIT_ATTACH _IO('R', 4)
+#define FASTRPC_IOCTL_INIT_CREATE _IOWR('R', 5, struct fastrpc_init_create)

struct fastrpc_invoke_args {
__s32 fd;
@@ -19,4 +21,14 @@ struct fastrpc_invoke {
struct fastrpc_invoke_args *args;
};

+struct fastrpc_init_create {
+ __u32 filelen; /* elf file length */
+ __u32 filefd; /* fd for the file */
+ __u32 memlen; /* mem length */
+ __u32 memfd; /* fd for the mem */
+ __u32 attrs;
+ __u32 siglen;
+ __u64 file; /* pointer to elf file */
+};
+
#endif /* __QCOM_FASTRPC_H__ */
--
2.19.2
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