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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH v2 05/12] mini-os: use alloc_file_type() and get_file_from_fd() in tpmfront
Juergen Gross, le mar. 11 janv. 2022 16:12:08 +0100, a ecrit:
> Allocate a file type dynamically via alloc_file_type().
>
> Instead of directly accessing the files[] array use get_file_from_fd().
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
modulo the int fd / file * thing,
Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
> ---
> include/lib.h | 3 +-
> include/tpmfront.h | 5 ---
> lib/sys.c | 23 -----------
> tpmfront.c | 100 ++++++++++++++++++++++++++++++++-------------
> 4 files changed, 72 insertions(+), 59 deletions(-)
>
> diff --git a/include/lib.h b/include/lib.h
> index d94d142..f6478de 100644
> --- a/include/lib.h
> +++ b/include/lib.h
> @@ -165,8 +165,7 @@ void sanity_check(void);
> #define FTYPE_KBD 7
> #define FTYPE_TAP 8
> #define FTYPE_BLK 9
> -#define FTYPE_TPMFRONT 10
> -#define FTYPE_N 11
> +#define FTYPE_N 10
> #define FTYPE_SPARE 16
>
> typedef int file_read_func(int fd, void *buf, size_t nbytes);
> diff --git a/include/tpmfront.h b/include/tpmfront.h
> index b7da50e..a527371 100644
> --- a/include/tpmfront.h
> +++ b/include/tpmfront.h
> @@ -81,7 +81,6 @@ int tpmfront_cmd(struct tpmfront_dev* dev, uint8_t* req,
> size_t reqlen, uint8_t*
> int tpmfront_set_locality(struct tpmfront_dev* dev, int locality);
>
> #ifdef HAVE_LIBC
> -#include <sys/stat.h>
> /* POSIX IO functions:
> * use tpmfront_open() to get a file descriptor to the tpm device
> * use write() on the fd to send a command to the backend. You must
> @@ -90,10 +89,6 @@ int tpmfront_set_locality(struct tpmfront_dev* dev, int
> locality);
> * fstat() to get the size of the response and lseek() to seek on it.
> */
> int tpmfront_open(struct tpmfront_dev* dev);
> -int tpmfront_posix_read(int fd, uint8_t* buf, size_t count);
> -int tpmfront_posix_write(int fd, const uint8_t* buf, size_t count);
> -int tpmfront_posix_fstat(int fd, struct stat* buf);
> #endif
>
> -
> #endif
> diff --git a/lib/sys.c b/lib/sys.c
> index 4060b42..ff6be52 100644
> --- a/lib/sys.c
> +++ b/lib/sys.c
> @@ -28,7 +28,6 @@
> #include <netfront.h>
> #include <blkfront.h>
> #include <fbfront.h>
> -#include <tpmfront.h>
> #include <xenbus.h>
> #include <xenstore.h>
> #include <poll.h>
> @@ -343,11 +342,6 @@ int read(int fd, void *buf, size_t nbytes)
> case FTYPE_BLK: {
> return blkfront_posix_read(fd, buf, nbytes);
> }
> -#endif
> -#ifdef CONFIG_TPMFRONT
> - case FTYPE_TPMFRONT: {
> - return tpmfront_posix_read(fd, buf, nbytes);
> - }
> #endif
> default:
> break;
> @@ -389,10 +383,6 @@ int write(int fd, const void *buf, size_t nbytes)
> #ifdef CONFIG_BLKFRONT
> case FTYPE_BLK:
> return blkfront_posix_write(fd, buf, nbytes);
> -#endif
> -#ifdef CONFIG_TPMFRONT
> - case FTYPE_TPMFRONT:
> - return tpmfront_posix_write(fd, buf, nbytes);
> #endif
> default:
> break;
> @@ -445,10 +435,6 @@ off_t lseek(int fd, off_t offset, int whence)
> #ifdef CONFIG_BLKFRONT
> case FTYPE_BLK:
> break;
> -#endif
> -#ifdef CONFIG_TPMFRONT
> - case FTYPE_TPMFRONT:
> - break;
> #endif
> case FTYPE_FILE:
> break;
> @@ -496,11 +482,6 @@ int close(int fd)
> shutdown_blkfront(files[fd].dev);
> break;
> #endif
> -#ifdef CONFIG_TPMFRONT
> - case FTYPE_TPMFRONT:
> - shutdown_tpmfront(files[fd].dev);
> - break;
> -#endif
> #ifdef CONFIG_KBDFRONT
> case FTYPE_KBD:
> shutdown_kbdfront(files[fd].dev);
> @@ -576,10 +557,6 @@ int fstat(int fd, struct stat *buf)
> #ifdef CONFIG_BLKFRONT
> case FTYPE_BLK:
> return blkfront_posix_fstat(fd, buf);
> -#endif
> -#ifdef CONFIG_TPMFRONT
> - case FTYPE_TPMFRONT:
> - return tpmfront_posix_fstat(fd, buf);
> #endif
> default:
> break;
> diff --git a/tpmfront.c b/tpmfront.c
> index 0a2fefc..a19a052 100644
> --- a/tpmfront.c
> +++ b/tpmfront.c
> @@ -49,6 +49,10 @@
> void tpmfront_handler(evtchn_port_t port, struct pt_regs *regs, void *data) {
> struct tpmfront_dev* dev = (struct tpmfront_dev*) data;
> tpmif_shared_page_t *shr = dev->page;
> +#ifdef HAVE_LIBC
> + struct file *file = get_file_from_fd(dev->fd);
> +#endif
> +
> /*If we get a response when we didnt make a request, just ignore it */
> if(!dev->waiting) {
> return;
> @@ -65,8 +69,9 @@ void tpmfront_handler(evtchn_port_t port, struct pt_regs
> *regs, void *data) {
>
> dev->waiting = 0;
> #ifdef HAVE_LIBC
> - if(dev->fd >= 0) {
> - files[dev->fd].read = true;
> + if ( file )
> + {
> + file->read = true;
> }
> #endif
> wake_up(&dev->waitq);
> @@ -405,6 +410,10 @@ int tpmfront_send(struct tpmfront_dev* dev, const
> uint8_t* msg, size_t length)
> #ifdef TPMFRONT_PRINT_DEBUG
> int i;
> #endif
> +#ifdef HAVE_LIBC
> + struct file *file = dev ? get_file_from_fd(dev->fd) : NULL;
> +#endif
> +
> /* Error Checking */
> if(dev == NULL || dev->state != XenbusStateConnected) {
> TPMFRONT_ERR("Tried to send message through disconnected frontend\n");
> @@ -437,9 +446,10 @@ int tpmfront_send(struct tpmfront_dev* dev, const
> uint8_t* msg, size_t length)
> dev->waiting = 1;
> dev->resplen = 0;
> #ifdef HAVE_LIBC
> - if(dev->fd >= 0) {
> - files[dev->fd].read = false;
> - files[dev->fd].offset = 0;
> + if ( file )
> + {
> + file->read = false;
> + file->offset = 0;
> dev->respgot = false;
> }
> #endif
> @@ -529,25 +539,14 @@ int tpmfront_set_locality(struct tpmfront_dev* dev, int
> locality)
>
> #ifdef HAVE_LIBC
> #include <errno.h>
> -int tpmfront_open(struct tpmfront_dev* dev)
> -{
> - /* Silently prevent multiple opens */
> - if(dev->fd != -1) {
> - return dev->fd;
> - }
>
> - dev->fd = alloc_fd(FTYPE_TPMFRONT);
> - printk("tpmfront_open(%s) -> %d\n", dev->nodename, dev->fd);
> - files[dev->fd].dev = dev;
> - dev->respgot = false;
> - return dev->fd;
> -}
> -
> -int tpmfront_posix_write(int fd, const uint8_t* buf, size_t count)
> +static int tpmfront_posix_write(int fd, const void *buf, size_t count)
> {
> int rc;
> struct tpmfront_dev* dev;
> - dev = files[fd].dev;
> + struct file *file = get_file_from_fd(fd);
> +
> + dev = file->dev;
>
> if(count == 0) {
> return 0;
> @@ -566,14 +565,15 @@ int tpmfront_posix_write(int fd, const uint8_t* buf,
> size_t count)
> return count;
> }
>
> -int tpmfront_posix_read(int fd, uint8_t* buf, size_t count)
> +static int tpmfront_posix_read(int fd, void *buf, size_t count)
> {
> int rc;
> uint8_t* dummybuf;
> size_t dummysz;
> struct tpmfront_dev* dev;
> + struct file *file = get_file_from_fd(fd);
>
> - dev = files[fd].dev;
> + dev = file->dev;
>
> if(count == 0) {
> return 0;
> @@ -588,29 +588,33 @@ int tpmfront_posix_read(int fd, uint8_t* buf, size_t
> count)
> }
>
> /* handle EOF case */
> - if(files[dev->fd].offset >= dev->resplen) {
> + if ( file->offset >= dev->resplen )
> + {
> return 0;
> }
>
> /* Compute the number of bytes and do the copy operation */
> - if((rc = min(count, dev->resplen - files[dev->fd].offset)) != 0) {
> - memcpy(buf, dev->respbuf + files[dev->fd].offset, rc);
> - files[dev->fd].offset += rc;
> + if ( (rc = min(count, dev->resplen - file->offset)) != 0 )
> + {
> + memcpy(buf, dev->respbuf + file->offset, rc);
> + file->offset += rc;
> }
>
> return rc;
> }
>
> -int tpmfront_posix_fstat(int fd, struct stat* buf)
> +static int tpmfront_posix_fstat(int fd, struct stat *buf)
> {
> uint8_t* dummybuf;
> size_t dummysz;
> int rc;
> - struct tpmfront_dev* dev = files[fd].dev;
> + struct file *file = get_file_from_fd(fd);
> + struct tpmfront_dev* dev = file->dev;
>
> /* If we have a response waiting, then read it now from the backend
> * so we can get its length*/
> - if(dev->waiting || (files[dev->fd].read && !dev->respgot)) {
> + if ( dev->waiting || (file->read && !dev->respgot) )
> + {
> if ((rc = tpmfront_recv(dev, &dummybuf, &dummysz)) != 0) {
> errno = EIO;
> return -1;
> @@ -626,5 +630,43 @@ int tpmfront_posix_fstat(int fd, struct stat* buf)
> return 0;
> }
>
> +static int tpmfront_close_fd(int fd)
> +{
> + struct file *file = get_file_from_fd(fd);
> +
> + shutdown_tpmfront(file->dev);
> +
> + return 0;
> +}
> +
> +static struct file_ops tpmfront_ops = {
> + .name = "tpmfront",
> + .read = tpmfront_posix_read,
> + .write = tpmfront_posix_write,
> + .lseek = lseek_default,
> + .close = tpmfront_close_fd,
> + .fstat = tpmfront_posix_fstat,
> +};
> +
> +int tpmfront_open(struct tpmfront_dev* dev)
> +{
> + struct file *file;
> + static unsigned int ftype_tpmfront;
> +
> + /* Silently prevent multiple opens */
> + if(dev->fd != -1) {
> + return dev->fd;
> + }
> +
> + if ( !ftype_tpmfront )
> + ftype_tpmfront = alloc_file_type(&tpmfront_ops);
> +
> + dev->fd = alloc_fd(ftype_tpmfront);
> + printk("tpmfront_open(%s) -> %d\n", dev->nodename, dev->fd);
> + file = get_file_from_fd(dev->fd);
> + file->dev = dev;
> + dev->respgot = false;
> + return dev->fd;
> +}
>
> #endif
> --
> 2.26.2
>
--
Samuel
"...very few phenomena can pull someone out of Deep Hack Mode, with two
noted exceptions: being struck by lightning, or worse, your *computer*
being struck by lightning."
(By Matt Welsh)
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