From: Helge Deller <deller@gmx.de>
To: Alexey Gladkov <legion@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
kbd@lists.linux.dev, linux-api@vger.kernel.org,
linux-fbdev@vger.kernel.org, linux-serial@vger.kernel.org
Subject: Re: [PATCH v5 2/3] VT: Add KDFONTINFO ioctl
Date: Wed, 17 Apr 2024 21:31:53 +0200 [thread overview]
Message-ID: <9019dc74-35ad-43d7-8763-cea3da93e9c1@gmx.de> (raw)
In-Reply-To: <bd2755e7b6ebe9b49e82d04d9908a176e0fe2f15.1713375378.git.legion@kernel.org>
On 4/17/24 19:37, Alexey Gladkov wrote:
> Each driver has its own restrictions on font size. There is currently no
> way to understand what the requirements are. The new ioctl allows
> userspace to get the minimum and maximum font size values.
>
> Acked-by: Helge Deller <deller@gmx.de>
> Signed-off-by: Alexey Gladkov <legion@kernel.org>
> ---
> drivers/tty/vt/vt.c | 24 ++++++++++++++++++++++++
> drivers/tty/vt/vt_ioctl.c | 13 +++++++++++++
> include/linux/console.h | 3 +++
> include/linux/vt_kern.h | 1 +
> include/uapi/linux/kd.h | 14 ++++++++++++++
> 5 files changed, 55 insertions(+)
>
> diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
> index 9b5b98dfc8b4..e8db0e9ea674 100644
> --- a/drivers/tty/vt/vt.c
> +++ b/drivers/tty/vt/vt.c
> @@ -4851,6 +4851,30 @@ int con_font_op(struct vc_data *vc, struct console_font_op *op)
> return -ENOSYS;
> }
>
> +int con_font_info(struct vc_data *vc, struct console_font_info *info)
> +{
> + int rc;
> +
> + info->min_height = 0;
> + info->max_height = max_font_height;
> +
> + info->min_width = 0;
> + info->max_width = max_font_width;
> +
> + info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE;
> +
> + console_lock();
> + if (vc->vc_mode != KD_TEXT)
> + rc = -EINVAL;
> + else if (vc->vc_sw->con_font_info)
> + rc = vc->vc_sw->con_font_info(vc, info);
> + else
> + rc = -ENOSYS;
> + console_unlock();
> +
> + return rc;
> +}
> +
> /*
> * Interface exported to selection and vcs.
> */
> diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c
> index 4b91072f3a4e..9a2f8081f650 100644
> --- a/drivers/tty/vt/vt_ioctl.c
> +++ b/drivers/tty/vt/vt_ioctl.c
> @@ -479,6 +479,19 @@ static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd,
> break;
> }
>
> + case KDFONTINFO: {
> + struct console_font_info fnt_info;
> +
> + memset(&fnt_info, 0, sizeof(fnt_info));
> +
> + ret = con_font_info(vc, &fnt_info);
> + if (ret)
> + return ret;
> + if (copy_to_user(up, &fnt_info, sizeof(fnt_info)))
> + return -EFAULT;
> + break;
> + }
> +
> default:
> return -ENOIOCTLCMD;
> }
> diff --git a/include/linux/console.h b/include/linux/console.h
> index 31a8f5b85f5d..4b798322aa01 100644
> --- a/include/linux/console.h
> +++ b/include/linux/console.h
> @@ -21,6 +21,7 @@
> #include <linux/vesa.h>
>
> struct vc_data;
> +struct console_font_info;
> struct console_font_op;
> struct console_font;
> struct module;
> @@ -102,6 +103,8 @@ struct consw {
> bool (*con_switch)(struct vc_data *vc);
> bool (*con_blank)(struct vc_data *vc, enum vesa_blank_mode blank,
> bool mode_switch);
> + int (*con_font_info)(struct vc_data *vc,
> + struct console_font_info *info);
> int (*con_font_set)(struct vc_data *vc,
> const struct console_font *font,
> unsigned int vpitch, unsigned int flags);
> diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
> index d008c3d0a9bb..383b3a4f6113 100644
> --- a/include/linux/vt_kern.h
> +++ b/include/linux/vt_kern.h
> @@ -33,6 +33,7 @@ void do_blank_screen(int entering_gfx);
> void do_unblank_screen(int leaving_gfx);
> void poke_blanked_console(void);
> int con_font_op(struct vc_data *vc, struct console_font_op *op);
> +int con_font_info(struct vc_data *vc, struct console_font_info *info);
> int con_set_cmap(unsigned char __user *cmap);
> int con_get_cmap(unsigned char __user *cmap);
> void scrollback(struct vc_data *vc);
> diff --git a/include/uapi/linux/kd.h b/include/uapi/linux/kd.h
> index 8ddb2219a84b..68b715ad4d5c 100644
> --- a/include/uapi/linux/kd.h
> +++ b/include/uapi/linux/kd.h
> @@ -185,6 +185,20 @@ struct console_font {
>
> #define KD_FONT_FLAG_DONT_RECALC 1 /* Don't recalculate hw charcell size [compat] */
>
> +/* font information */
> +
> +#define KD_FONT_INFO_FLAG_LOW_SIZE _BITUL(0) /* 256 */
> +#define KD_FONT_INFO_FLAG_HIGH_SIZE _BITUL(1) /* 512 */
Do we really need those bits?
You set a default min/max font size in con_font_info() above,
and all drivers can override those values.
So, there are always min/max sizes available.
> +struct console_font_info {
> + __u32 flags; /* KD_FONT_INFO_FLAG_* */
One space too much in front of "flags" ?
> + __u32 min_width, min_height; /* minimal font size */
> + __u32 max_width, max_height; /* maximum font size */
> + __u32 reserved[5]; /* This field is reserved for future use. Must be 0. */
> +};
> +
> +#define KDFONTINFO _IOR(KD_IOCTL_BASE, 0x73, struct console_font_info)
> +
> /* note: 0x4B00-0x4B4E all have had a value at some time;
> don't reuse for the time being */
> /* note: 0x4B60-0x4B6D, 0x4B70-0x4B72 used above */
next prev parent reply other threads:[~2024-04-17 19:32 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-15 15:37 [RFC PATCH v1 0/5] VT: Add ability to get font requirements Alexey Gladkov
2024-02-15 15:37 ` [RFC PATCH v1 1/5] VT: Add KD_FONT_OP_GET_INFO operation Alexey Gladkov
2024-02-15 15:37 ` [RFC PATCH v1 2/5] newport_con: Allow to get max font width and height Alexey Gladkov
2024-02-15 15:37 ` [RFC PATCH v1 3/5] sticon: " Alexey Gladkov
2024-02-16 7:10 ` Jiri Slaby
2024-02-16 13:03 ` Alexey Gladkov
2024-02-15 15:37 ` [RFC PATCH v1 4/5] vgacon: " Alexey Gladkov
2024-02-15 15:37 ` [RFC PATCH v1 5/5] fbcon: " Alexey Gladkov
2024-02-16 7:21 ` [RFC PATCH v1 0/5] VT: Add ability to get font requirements Jiri Slaby
2024-02-16 13:26 ` Alexey Gladkov
2024-02-16 13:45 ` Samuel Thibault
2024-02-16 14:40 ` Alexey Gladkov
2024-02-21 7:04 ` Jiri Slaby
2024-02-26 15:21 ` [RFC PATCH v2 " Alexey Gladkov
2024-02-26 15:21 ` [RFC PATCH v2 1/5] VT: Add KD_FONT_OP_GET_INFO operation Alexey Gladkov
2024-02-26 15:21 ` [RFC PATCH v2 2/5] newport_con: Allow to get max font width and height Alexey Gladkov
2024-02-26 15:21 ` [RFC PATCH v2 3/5] sticon: " Alexey Gladkov
2024-02-27 5:52 ` Greg Kroah-Hartman
2024-02-27 14:06 ` Alexey Gladkov
2024-02-26 15:21 ` [RFC PATCH v2 4/5] vgacon: " Alexey Gladkov
2024-02-26 15:21 ` [RFC PATCH v2 5/5] fbcon: " Alexey Gladkov
2024-03-12 14:23 ` [PATCH v3 0/2] VT: Add ability to get font requirements legion
2024-03-12 14:23 ` [PATCH v3 1/2] VT: Add KDFONTINFO ioctl legion
2024-03-15 9:15 ` Helge Deller
2024-03-12 14:23 ` [PATCH v3 2/2] VT: Allow to get max font width and height legion
2024-03-13 17:40 ` Oleg Bulatov
2024-04-02 11:09 ` Jiri Slaby
2024-03-15 9:16 ` Helge Deller
2024-04-02 10:32 ` [RESEND PATCH v3 0/2] VT: Add ability to get font requirements Alexey Gladkov
2024-04-02 10:32 ` [RESEND PATCH v3 1/2] VT: Add KDFONTINFO ioctl Alexey Gladkov
2024-04-02 11:02 ` Jiri Slaby
2024-04-02 13:19 ` Alexey Gladkov
2024-04-03 5:27 ` Jiri Slaby
2024-04-10 16:29 ` Alexey Gladkov
2024-04-10 17:11 ` Greg Kroah-Hartman
2024-04-02 17:50 ` [PATCH v4 0/3] VT: Add ability to get font requirements Alexey Gladkov
2024-04-02 17:50 ` [PATCH v4 1/3] VT: Use macros to define ioctls Alexey Gladkov
2024-04-02 17:50 ` [PATCH v4 2/3] VT: Add KDFONTINFO ioctl Alexey Gladkov
2024-04-03 4:55 ` Greg Kroah-Hartman
2024-04-03 5:05 ` Jiri Slaby
2024-04-10 16:36 ` Alexey Gladkov
2024-04-11 3:53 ` Jiri Slaby
2024-04-02 17:50 ` [PATCH v4 3/3] VT: Allow to get max font width and height Alexey Gladkov
2024-04-17 17:37 ` [PATCH v5 0/3] VT: Add ability to get font requirements Alexey Gladkov
2024-04-17 17:37 ` [PATCH v5 1/3] VT: Use macros to define ioctls Alexey Gladkov
2024-04-18 6:18 ` Greg Kroah-Hartman
2024-04-17 17:37 ` [PATCH v5 2/3] VT: Add KDFONTINFO ioctl Alexey Gladkov
2024-04-17 19:31 ` Helge Deller [this message]
2024-04-18 10:45 ` Alexey Gladkov
2024-04-25 10:33 ` Helge Deller
2024-04-25 11:06 ` Alexey Gladkov
2024-04-25 11:35 ` Helge Deller
2024-04-18 6:18 ` Greg Kroah-Hartman
2024-04-18 10:27 ` Alexey Gladkov
2024-04-17 17:37 ` [PATCH v5 3/3] VT: Allow to get max font width and height Alexey Gladkov
2024-04-02 10:32 ` [RESEND PATCH v3 2/2] " Alexey Gladkov
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