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charset="utf-8" Introduce sclp-vt220 event buffer type to replace the byte-manipulation behavior in the receiver function with well defined primitives. Signed-off-by: Maximilian Immanuel Brandtner Reviewed-by: Peter Oberparleiter --- drivers/s390/char/sclp_vt220.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c index 62979adcb..6de4e2e41 100644 --- a/drivers/s390/char/sclp_vt220.c +++ b/drivers/s390/char/sclp_vt220.c @@ -52,6 +52,12 @@ struct sclp_vt220_sccb { struct evbuf_header evbuf; }; =20 +struct sclp_vt220_evbuf { + struct evbuf_header header; + char type; + char data[]; +} __packed; + #define SCLP_VT220_MAX_CHARS_PER_BUFFER (PAGE_SIZE - \ sizeof(struct sclp_vt220_request) - \ sizeof(struct sclp_vt220_sccb)) @@ -522,25 +528,25 @@ static void sclp_vt220_handle_input(const char *buffe= r, unsigned int count) /* * Called by the SCLP to report incoming event buffers. */ -static void -sclp_vt220_receiver_fn(struct evbuf_header *evbuf) +static void sclp_vt220_receiver_fn(struct evbuf_header *evbuf) { - char *buffer; + struct sclp_vt220_evbuf *buffer; 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charset="utf-8" Add support for sclp vt220 resize events to enable host-initiated terminal resizing when using the sclp-vt220 console. This allows QEMU to dynamically resize the console. On older kernel versions, these events are safely ignored as the kernel drops events with undefined tty codes. Signed-off-by: Maximilian Immanuel Brandtner --- drivers/s390/char/sclp_vt220.c | 63 +++++++++++++++++++++++++++++++--- 1 file changed, 59 insertions(+), 4 deletions(-) diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c index 6de4e2e41..b9162f36d 100644 --- a/drivers/s390/char/sclp_vt220.c +++ b/drivers/s390/char/sclp_vt220.c @@ -27,6 +27,7 @@ #include #include #include +#include =20 #include #include "sclp.h" @@ -58,6 +59,11 @@ struct sclp_vt220_evbuf { char data[]; } __packed; =20 +struct sclp_vt220_resize_data_t { + u16 rows; + u16 cols; +} __packed; + #define SCLP_VT220_MAX_CHARS_PER_BUFFER (PAGE_SIZE - \ sizeof(struct sclp_vt220_request) - \ sizeof(struct sclp_vt220_sccb)) @@ -98,6 +104,15 @@ static int __initdata sclp_vt220_init_count; * another buffer */ static int sclp_vt220_flush_later; =20 +/* Work struct required for scheduling resize */ +static struct work_struct sclp_vt220_resize_work; + +/* Current vt220 terminal winsize */ +static struct winsize sclp_vt220_winsize =3D { + .ws_row =3D 24, + .ws_col =3D 80, +}; + static void sclp_vt220_receiver_fn(struct evbuf_header *evbuf); static int __sclp_vt220_emit(struct sclp_vt220_request *request); static void sclp_vt220_emit_current(void); @@ -477,6 +492,7 @@ sclp_vt220_write(struct tty_struct *tty, const u8 *buf,= size_t count) #define SCLP_VT220_SESSION_ENDED 0x01 #define SCLP_VT220_SESSION_STARTED 0x80 #define SCLP_VT220_SESSION_DATA 0x00 +#define SCLP_VT220_SESSION_RESIZE 0x08 =20 #ifdef CONFIG_MAGIC_SYSRQ =20 @@ -525,6 +541,38 @@ static void sclp_vt220_handle_input(const char *buffer= , unsigned int count) =20 #endif =20 +static void sclp_vt220_resize(struct work_struct *work) +{ + struct tty_struct *tty; + struct winsize ws; + + spin_lock_irq(&sclp_vt220_lock); + ws =3D sclp_vt220_winsize; + spin_unlock_irq(&sclp_vt220_lock); + + tty =3D tty_port_tty_get(&sclp_vt220_port); + if (!tty) + return; + + tty_do_resize(tty, &ws); + tty_kref_put(tty); +} + +static void sclp_vt220_resize_sched(void *buffer, unsigned int count) +{ + struct sclp_vt220_resize_data_t *data =3D buffer; + unsigned long flags; + + if (count < sizeof(*data)) + return; + + spin_lock_irqsave(&sclp_vt220_lock, flags); + sclp_vt220_winsize.ws_row =3D data->rows; + sclp_vt220_winsize.ws_col =3D data->cols; + schedule_work(&sclp_vt220_resize_work); + spin_unlock_irqrestore(&sclp_vt220_lock, flags); +} + /* * Called by the SCLP to report incoming event buffers. */ @@ -549,6 +597,9 @@ static void sclp_vt220_receiver_fn(struct evbuf_header = *evbuf) sclp_vt220_handle_input(buffer->data, count); tty_flip_buffer_push(&sclp_vt220_port); break; + case SCLP_VT220_SESSION_RESIZE: + sclp_vt220_resize_sched(buffer->data, count); + break; } } =20 @@ -560,10 +611,12 @@ sclp_vt220_open(struct tty_struct *tty, struct file *= filp) { if (tty->count =3D=3D 1) { tty_port_tty_set(&sclp_vt220_port, tty); - if (!tty->winsize.ws_row && !tty->winsize.ws_col) { - tty->winsize.ws_row =3D 24; - tty->winsize.ws_col =3D 80; - } + + mutex_lock(&tty->winsize_mutex); + spin_lock_irq(&sclp_vt220_lock); + tty->winsize =3D sclp_vt220_winsize; + spin_unlock_irq(&sclp_vt220_lock); + mutex_unlock(&tty->winsize_mutex); } return 0; } @@ -757,6 +810,8 @@ static int __init sclp_vt220_tty_init(void) rc =3D tty_register_driver(driver); if (rc) goto out_init; + + INIT_WORK(&sclp_vt220_resize_work, sclp_vt220_resize); rc =3D sclp_register(&sclp_vt220_register_input); if (rc) goto out_reg; --=20 2.54.0