From patchwork Tue Mar 12 14:23:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Gladkov X-Patchwork-Id: 779978 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 36B797B3C7; Tue, 12 Mar 2024 14:24:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710253454; cv=none; b=p+utODWUZYYYhReW3mICIoc97pAQA10b0KO9I5taxCa4ao2sIoBADKqLSxtNqQq/yuaxEIh4Z1nchYfv5OreuUEtim4/GslvCQ7J48eKFO9aVEW/F2sbIFXoOEFq6RgwTI+0+S5D+C7gnbs4dMnE58MlHg1a18LbtiF1yCY9+Mk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710253454; c=relaxed/simple; bh=9qlk7GD9pq1DJKHl/qvH6Vvyk7ogZ7rO5bWU0G4xQ30=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gGx3zTtbgejqWt72k7VEat8s/f6M+JgB3lqvJo2tVSID/zPeXWjV3wIXx0k9A3wRJc/iw08235xDKWD3J+bI6nqHLYlsw0pzvzQmJP8sWvwrPfGZCt8n62pfRaNxn6+m7NWPrS6FXVAkb0NmaXie98RLS2qwZENZcdVqmCup/J4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TuX+KZ1g; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="TuX+KZ1g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03DF3C43399; Tue, 12 Mar 2024 14:24:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710253453; bh=9qlk7GD9pq1DJKHl/qvH6Vvyk7ogZ7rO5bWU0G4xQ30=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TuX+KZ1gFoe0h5o4Ny53zZrvAWMtdFr0qqQHm43GN9Zis1Ml7oGsZuykoiJsWKYyq OW+xdKp6f63QOwCVv/3NJspSL+g24ak46iT0jId8NJW2eC0rujYYNR79qgX6jxcLM5 7uoBI9P6OQlM7x7Qp3QeddhLJ76YV0lEqynHLaM3GLM57RCq90KD/CD7E7lyGohZzb nP6uokfCONJCFZHCXkPrhY1o1fpdVTTJniDRXwnNNW2Zo8Sn659EyWQ15+WcdtLOO2 YUZfpCSZQURktpMFptyluii7cHICOxWOztUaS+1j7JznPNXu66TCYACq0GazjlPBlC 8vTw4lM0cbX2Q== From: legion@kernel.org To: Greg Kroah-Hartman , Jiri Slaby Cc: Alexey Gladkov , LKML , kbd@lists.linux.dev, linux-api@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-serial@vger.kernel.org Subject: [PATCH v3 1/2] VT: Add KDFONTINFO ioctl Date: Tue, 12 Mar 2024 15:23:57 +0100 Message-ID: X-Mailer: git-send-email 2.44.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Alexey Gladkov 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 minmum and maximum font size values. Signed-off-by: Alexey Gladkov Acked-by: Helge Deller --- drivers/tty/vt/vt.c | 24 ++++++++++++++++++++++++ drivers/tty/vt/vt_ioctl.c | 13 +++++++++++++ include/linux/console.h | 2 ++ include/linux/vt_kern.h | 1 + include/uapi/linux/kd.h | 13 ++++++++++++- 5 files changed, 52 insertions(+), 1 deletion(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 156efda7c80d..8c2a3d98b5ec 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -4680,6 +4680,30 @@ 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 = -EINVAL; + + 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 8c685b501404..b3b4e4b69366 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; + + if (copy_from_user(&fnt_info, up, sizeof(fnt_info))) + return -EFAULT; + 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 779d388af8a0..5bea6f6c2042 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -20,6 +20,7 @@ #include struct vc_data; +struct console_font_info; struct console_font_op; struct console_font; struct module; @@ -59,6 +60,7 @@ struct consw { unsigned int lines); int (*con_switch)(struct vc_data *vc); int (*con_blank)(struct vc_data *vc, int blank, int mode_switch); + int (*con_font_info)(struct vc_data *vc, struct console_font_info *info); int (*con_font_set)(struct vc_data *vc, struct console_font *font, unsigned int vpitch, unsigned int flags); int (*con_font_get)(struct vc_data *vc, struct console_font *font, diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h index c1f5aebef170..6bda4cc1fe6f 100644 --- a/include/linux/vt_kern.h +++ b/include/linux/vt_kern.h @@ -32,6 +32,7 @@ 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 6b384065c013..781e086e55bf 100644 --- a/include/uapi/linux/kd.h +++ b/include/uapi/linux/kd.h @@ -183,8 +183,19 @@ struct console_font { #define KD_FONT_FLAG_DONT_RECALC 1 /* Don't recalculate hw charcell size [compat] */ +#define KDFONTINFO 0x4B73 /* font information */ + +#define KD_FONT_INFO_FLAG_LOW_SIZE (1U << 0) /* 256 */ +#define KD_FONT_INFO_FLAG_HIGH_SIZE (1U << 1) /* 512 */ + +struct console_font_info { + unsigned int min_width, min_height; /* minimal font size */ + unsigned int max_width, max_height; /* maximum font size */ + unsigned int flags; /* KD_FONT_INFO_FLAG_* */ +}; + /* 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 */ +/* note: 0x4B60-0x4B6D, 0x4B70-0x4B73 used above */ #endif /* _UAPI_LINUX_KD_H */ From patchwork Tue Mar 12 14:23:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Gladkov X-Patchwork-Id: 780267 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 86E3D7BAF6; Tue, 12 Mar 2024 14:24:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; 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Tue, 12 Mar 2024 14:24:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710253456; bh=q6T87hUD5gO8HiHv1jhJS969Nl+81V50e8kMxP7/ldY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RaCO4OmZ+q0+oNKx8K06PtTZVOYs3I8UUZiOAAkOl2/SMpmFUF9yQvJhhuetTg8QR ICzmzW26NLjOjxriPkRChGkKoQSOBHsd1PYJeRpmGxntQrwvz3R9l6fLHVviE6KntR PiKLgdxjEZeUm4+hmNcjLdyXFYMd5j33GvsZ3dJ1AZJZxhqRBoTT0PMI+yu27Bw6FF y+LtvCY+R/48LHdEIn44l5fKWhlJB+qyTZ6dLfmP0V1cpwQzqPoDo+mfB1carZiIKN ChleVdq159G21ulUzQt0Qjq2AJSkmWBRRTSikxSG+Ax0/wQV/Gp1ABcgmVez1DY77b LQLpmsRLaKf1A== From: legion@kernel.org To: Greg Kroah-Hartman , Jiri Slaby Cc: Alexey Gladkov , LKML , kbd@lists.linux.dev, linux-api@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-serial@vger.kernel.org Subject: [PATCH v3 2/2] VT: Allow to get max font width and height Date: Tue, 12 Mar 2024 15:23:58 +0100 Message-ID: <78fcb9ad77b88edee8768806ce6a4d23f6d33118.1710252966.git.legion@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Alexey Gladkov The Console drivers has more restrictive font size limits than vt_ioctl. This leads to errors that are difficult to handle. If a font whose size is not supported is used, an EINVAL error will be returned, which is also returned in case of errors in the font itself. At the moment there is no way to understand what font sizes the current console driver supports. To solve this problem, we need to transfer information about the supported font to userspace from the console driver. Signed-off-by: Alexey Gladkov Acked-by: Helge Deller --- drivers/video/console/newport_con.c | 21 +++++++++++++++++---- drivers/video/console/sticon.c | 25 +++++++++++++++++++++++-- drivers/video/console/vgacon.c | 21 ++++++++++++++++++++- drivers/video/fbdev/core/fbcon.c | 22 +++++++++++++++++++++- 4 files changed, 81 insertions(+), 8 deletions(-) diff --git a/drivers/video/console/newport_con.c b/drivers/video/console/newport_con.c index e8e4f82cd4a1..87f174a95fa8 100644 --- a/drivers/video/console/newport_con.c +++ b/drivers/video/console/newport_con.c @@ -33,6 +33,9 @@ #define NEWPORT_LEN 0x10000 +#define NEWPORT_MAX_FONT_WIDTH 8 +#define NEWPORT_MAX_FONT_HEIGHT 16 + #define FONT_DATA ((unsigned char *)font_vga_8x16.data) static unsigned char *font_data[MAX_NR_CONSOLES]; @@ -328,8 +331,8 @@ static void newport_init(struct vc_data *vc, int init) { int cols, rows; - cols = newport_xsize / 8; - rows = newport_ysize / 16; + cols = newport_xsize / NEWPORT_MAX_FONT_WIDTH; + rows = newport_ysize / NEWPORT_MAX_FONT_HEIGHT; vc->vc_can_do_color = 1; if (init) { vc->vc_cols = cols; @@ -507,8 +510,8 @@ static int newport_set_font(int unit, struct console_font *op, unsigned int vpit /* ladis: when I grow up, there will be a day... and more sizes will * be supported ;-) */ - if ((w != 8) || (h != 16) || (vpitch != 32) - || (op->charcount != 256 && op->charcount != 512)) + if ((w != NEWPORT_MAX_FONT_WIDTH) || (h != NEWPORT_MAX_FONT_HEIGHT) || + (vpitch != 32) || (op->charcount != 256 && op->charcount != 512)) return -EINVAL; if (!(new_data = kmalloc(FONT_EXTRA_WORDS * sizeof(int) + size, @@ -569,6 +572,15 @@ static int newport_font_default(struct vc_data *vc, struct console_font *op, cha return newport_set_def_font(vc->vc_num, op); } +static int newport_font_info(struct vc_data *vc, struct console_font_info *info) +{ + info->min_width = info->max_width = NEWPORT_MAX_FONT_WIDTH; + info->min_height = info->max_height = NEWPORT_MAX_FONT_HEIGHT; + info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE; + + return 0; +} + static int newport_font_set(struct vc_data *vc, struct console_font *font, unsigned int vpitch, unsigned int flags) { @@ -688,6 +700,7 @@ const struct consw newport_con = { .con_scroll = newport_scroll, .con_switch = newport_switch, .con_blank = newport_blank, + .con_font_info = newport_font_info, .con_font_set = newport_font_set, .con_font_default = newport_font_default, .con_save_screen = newport_save_screen diff --git a/drivers/video/console/sticon.c b/drivers/video/console/sticon.c index 992a4fa431aa..d32ca458eb77 100644 --- a/drivers/video/console/sticon.c +++ b/drivers/video/console/sticon.c @@ -56,6 +56,11 @@ #define BLANK 0 static int vga_is_gfx; +#define STICON_MIN_FONT_WIDTH 6 +#define STICON_MIN_FONT_HEIGHT 6 +#define STICON_MAX_FONT_WIDTH 32 +#define STICON_MAX_FONT_HEIGHT 32 + #define STI_DEF_FONT sticon_sti->font /* borrowed from fbcon.c */ @@ -180,8 +185,10 @@ static int sticon_set_font(struct vc_data *vc, struct console_font *op, struct sti_cooked_font *cooked_font; unsigned char *data = op->data, *p; - if ((w < 6) || (h < 6) || (w > 32) || (h > 32) || (vpitch != 32) - || (op->charcount != 256 && op->charcount != 512)) + if (!in_range(w, STICON_MIN_FONT_WIDTH, STICON_MAX_FONT_WIDTH) || + !in_range(h, STICON_MIN_FONT_HEIGHT, STICON_MAX_FONT_HEIGHT) || + (vpitch != 32) || + (op->charcount != 256 && op->charcount != 512)) return -EINVAL; pitch = ALIGN(w, 8) / 8; bpc = pitch * h; @@ -273,6 +280,19 @@ static int sticon_font_set(struct vc_data *vc, struct console_font *font, return sticon_set_font(vc, font, vpitch); } +static int sticon_font_info(struct vc_data *vc, struct console_font_info *info) +{ + info->min_width = STICON_MIN_FONT_WIDTH; + info->min_height = STICON_MIN_FONT_HEIGHT; + + info->max_width = STICON_MAX_FONT_WIDTH; + info->max_height = STICON_MAX_FONT_HEIGHT; + + info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE; + + return 0; +} + static void sticon_init(struct vc_data *c, int init) { struct sti_struct *sti = sticon_sti; @@ -371,6 +391,7 @@ static const struct consw sti_con = { .con_scroll = sticon_scroll, .con_switch = sticon_switch, .con_blank = sticon_blank, + .con_font_info = sticon_font_info, .con_font_set = sticon_font_set, .con_font_default = sticon_font_default, .con_build_attr = sticon_build_attr, diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 8ef1579fa57f..b75d31ef3353 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -61,6 +61,10 @@ static struct vgastate vgastate; #define BLANK 0x0020 #define VGA_FONTWIDTH 8 /* VGA does not support fontwidths != 8 */ + +#define VGACON_MAX_FONT_WIDTH VGA_FONTWIDTH +#define VGACON_MAX_FONT_HEIGHT 32 + /* * Interface used by the world */ @@ -1013,6 +1017,19 @@ static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight) return 0; } +static int vgacon_font_info(struct vc_data *vc, struct console_font_info *info) +{ + info->min_width = VGACON_MAX_FONT_WIDTH; + info->min_height = 0; + + info->max_width = VGACON_MAX_FONT_WIDTH; + info->max_height = VGACON_MAX_FONT_HEIGHT; + + info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE; + + return 0; +} + static int vgacon_font_set(struct vc_data *c, struct console_font *font, unsigned int vpitch, unsigned int flags) { @@ -1022,7 +1039,8 @@ static int vgacon_font_set(struct vc_data *c, struct console_font *font, if (vga_video_type < VIDEO_TYPE_EGAM) return -EINVAL; - if (font->width != VGA_FONTWIDTH || font->height > 32 || vpitch != 32 || + if (font->width != VGACON_MAX_FONT_WIDTH || + font->height > VGACON_MAX_FONT_HEIGHT || vpitch != 32 || (charcount != 256 && charcount != 512)) return -EINVAL; @@ -1177,6 +1195,7 @@ const struct consw vga_con = { .con_scroll = vgacon_scroll, .con_switch = vgacon_switch, .con_blank = vgacon_blank, + .con_font_info = vgacon_font_info, .con_font_set = vgacon_font_set, .con_font_get = vgacon_font_get, .con_resize = vgacon_resize, diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index 46823c2e2ba1..e10abe416159 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -101,6 +101,9 @@ enum { FBCON_LOGO_DONTSHOW = -3 /* do not show the logo */ }; +#define FBCON_MAX_FONT_WIDTH 32 +#define FBCON_MAX_FONT_HEIGHT 32 + static struct fbcon_display fb_display[MAX_NR_CONSOLES]; static struct fb_info *fbcon_registered_fb[FB_MAX]; @@ -2456,6 +2459,21 @@ static int fbcon_do_set_font(struct vc_data *vc, int w, int h, int charcount, return ret; } + +static int fbcon_font_info(struct vc_data *vc, struct console_font_info *info) +{ + info->min_width = 0; + info->min_height = 0; + + info->max_width = FBCON_MAX_FONT_WIDTH; + info->max_height = FBCON_MAX_FONT_HEIGHT; + + info->flags = KD_FONT_INFO_FLAG_LOW_SIZE | KD_FONT_INFO_FLAG_HIGH_SIZE; + + return 0; +} + + /* * User asked to set font; we are guaranteed that charcount does not exceed 512 * but lets not assume that, since charcount of 512 is small for unicode support. @@ -2483,7 +2501,8 @@ static int fbcon_set_font(struct vc_data *vc, struct console_font *font, h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres)) return -EINVAL; - if (font->width > 32 || font->height > 32) + if (font->width > FBCON_MAX_FONT_WIDTH || + font->height > FBCON_MAX_FONT_HEIGHT) return -EINVAL; /* Make sure drawing engine can handle the font */ @@ -3158,6 +3177,7 @@ static const struct consw fb_con = { .con_scroll = fbcon_scroll, .con_switch = fbcon_switch, .con_blank = fbcon_blank, + .con_font_info = fbcon_font_info, .con_font_set = fbcon_set_font, .con_font_get = fbcon_get_font, .con_font_default = fbcon_set_def_font,