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misc: fastrpc: Add support for create remote init process
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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 <[email protected]>

Co-developed-by: Thierry Escande <[email protected]>
Signed-off-by: Thierry Escande <[email protected]>
Signed-off-by: Srinivas Kandagatla <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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@Srinivas-Kandagatla @gregkh
Srinivas-Kandagatla authored and gregkh committed Feb 12, 2019
1 parent c68cfb7 commit d73f71c
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156 changes: 156 additions & 0 deletions drivers/misc/fastrpc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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 */
Expand Down Expand Up @@ -59,6 +62,14 @@
#define FASTRPC_SCALARS(method, in, out) \
FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)

#define FASTRPC_CREATE_PROCESS_NARGS 6
/* 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",
Expand Down Expand Up @@ -688,6 +699,109 @@ static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
return err;
}

static int fastrpc_init_create_process(struct fastrpc_user *fl,
char __user *argp)
{
struct fastrpc_init_create init;
struct fastrpc_invoke_args *args;
struct fastrpc_phy_page pages[1];
struct fastrpc_map *map = NULL;
struct fastrpc_buf *imem = NULL;
int memlen;
int err;
struct {
int pgid;
u32 namelen;
u32 filelen;
u32 pageslen;
u32 attrs;
u32 siglen;
} inbuf;
u32 sc;

args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
if (!args)
return -ENOMEM;

if (copy_from_user(&init, argp, sizeof(init))) {
err = -EFAULT;
goto bail;
}

if (init.filelen > INIT_FILELEN_MAX) {
err = -EINVAL;
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) {
fastrpc_map_put(map);
goto bail;
}

fl->init_mem = imem;
args[0].ptr = (u64)(uintptr_t)&inbuf;
args[0].length = sizeof(inbuf);
args[0].fd = -1;

args[1].ptr = (u64)(uintptr_t)current->comm;
args[1].length = inbuf.namelen;
args[1].fd = -1;

args[2].ptr = (u64) 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 = (u64)(uintptr_t) pages;
args[3].length = 1 * sizeof(*pages);
args[3].fd = -1;

args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
args[4].length = sizeof(inbuf.attrs);
args[4].fd = -1;

args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
args[5].length = sizeof(inbuf.siglen);
args[5].fd = -1;

sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
if (init.attrs)
sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);

err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
sc, args);

if (err) {
fastrpc_map_put(map);
fastrpc_buf_free(imem);
}

bail:
kfree(args);

return err;
}

static struct fastrpc_session_ctx *fastrpc_session_alloc(
struct fastrpc_channel_ctx *cctx)
{
Expand Down Expand Up @@ -715,13 +829,32 @@ 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_args args[1];
int tgid = 0;
u32 sc;

tgid = fl->tgid;
args[0].ptr = (u64)(uintptr_t) &tgid;
args[0].length = sizeof(tgid);
args[0].fd = -1;
args[0].reserved = 0;
sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);

return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
sc, &args[0]);
}

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;
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);
Expand Down Expand Up @@ -773,6 +906,23 @@ static int fastrpc_device_open(struct inode *inode, struct file *filp)
return 0;
}

static int fastrpc_init_attach(struct fastrpc_user *fl)
{
struct fastrpc_invoke_args args[1];
int tgid = fl->tgid;
u32 sc;

args[0].ptr = (u64)(uintptr_t) &tgid;
args[0].length = sizeof(tgid);
args[0].fd = -1;
args[0].reserved = 0;
sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
fl->pd = 0;

return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
sc, &args[0]);
}

static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
{
struct fastrpc_invoke_args *args = NULL;
Expand Down Expand Up @@ -814,6 +964,12 @@ 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;
break;
Expand Down
10 changes: 10 additions & 0 deletions include/uapi/misc/fastrpc.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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 {
__u64 ptr;
Expand All @@ -20,4 +22,12 @@ struct fastrpc_invoke {
__u64 args;
};

struct fastrpc_init_create {
__u32 filelen; /* elf file length */
__s32 filefd; /* fd for the file */
__u32 attrs;
__u32 siglen;
__u64 file; /* pointer to elf file */
};

#endif /* __QCOM_FASTRPC_H__ */

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