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List: linux-api
Subject: Re: [PATCH] EFI: Expose GOP mode number through sysfs and add documentation.
From: Ard Biesheuvel <ard.biesheuvel () linaro ! org>
Date: 2019-01-30 13:29:39
Message-ID: CAKv+Gu-WvtnJ=WHCZCuxBYxABAWigsqk318Wpt6k97z00TNLQQ () mail ! gmail ! com
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On Wed, 30 Jan 2019 at 14:13, Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
>
> (add Arnd and linux-api for the uapi change)
>
(... and team-x86)
> On Tue, 29 Jan 2019 at 20:22, Peter Jones <pjones@redhat.com> wrote:
> >
> > To use the EFI firmware update "UX Capsule" extension, we need to know
> > what the GOP video mode number was during boot. This patch adds it to
> > the efi-framebuffer.N devices in sysfs and adds the various files in
> > /sys/bus/platform/drivers/efi-framebuffer/efi-framebuffer.N/ to the
> > sysfs documentation.
> >
> > Signed-off-by: Peter Jones <pjones@redhat.com>
> > ---
> > drivers/firmware/efi/libstub/gop.c | 16 ++++++++++++----
> > drivers/video/fbdev/efifb.c | 11 +++++++++++
> > include/uapi/linux/screen_info.h | 4 ++--
> > Documentation/ABI/testing/sysfs-firmware-efi | 15 +++++++++++++++
> > 4 files changed, 40 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/firmware/efi/libstub/gop.c \
> > b/drivers/firmware/efi/libstub/gop.c index 24c461dea7a..f9e174acb0b 100644
> > --- a/drivers/firmware/efi/libstub/gop.c
> > +++ b/drivers/firmware/efi/libstub/gop.c
> > @@ -89,7 +89,7 @@ static efi_status_t
> > __gop_query32(efi_system_table_t *sys_table_arg,
> > struct efi_graphics_output_protocol_32 *gop32,
> > struct efi_graphics_output_mode_info **info,
> > - unsigned long *size, u64 *fb_base)
> > + unsigned long *size, u64 *fb_base, u32 *mode_num)
> > {
> > struct efi_graphics_output_protocol_mode_32 *mode;
> > efi_graphics_output_protocol_query_mode query_mode;
> > @@ -106,6 +106,7 @@ __gop_query32(efi_system_table_t *sys_table_arg,
> > return status;
> >
> > *fb_base = mode->frame_buffer_base;
> > + *mode_num = mode->mode;
> > return status;
> > }
> >
> > @@ -115,6 +116,7 @@ setup_gop32(efi_system_table_t *sys_table_arg, struct \
> > screen_info *si, {
> > struct efi_graphics_output_protocol_32 *gop32, *first_gop;
> > unsigned long nr_gops;
> > + u32 mode_num;
> > u16 width, height;
> > u32 pixels_per_scan_line;
> > u32 ext_lfb_base;
> > @@ -148,7 +150,7 @@ setup_gop32(efi_system_table_t *sys_table_arg, struct \
> > screen_info *si, conout_found = true;
> >
> > status = __gop_query32(sys_table_arg, gop32, &info, &size,
> > - ¤t_fb_base);
> > + ¤t_fb_base, &mode_num);
> > if (status == EFI_SUCCESS && (!first_gop || conout_found) &&
> > info->pixel_format != PIXEL_BLT_ONLY) {
> > /*
> > @@ -182,6 +184,8 @@ setup_gop32(efi_system_table_t *sys_table_arg, struct \
> > screen_info *si, /* EFI framebuffer */
> > si->orig_video_isVGA = VIDEO_TYPE_EFI;
> >
> > + si->efi_gop_mode_high = (mode_num & 0xff00) >> 16;
> > + si->efi_gop_mode_low = (mode_num & 0xff);
> > si->lfb_width = width;
> > si->lfb_height = height;
> > si->lfb_base = fb_base;
> > @@ -207,7 +211,7 @@ static efi_status_t
> > __gop_query64(efi_system_table_t *sys_table_arg,
> > struct efi_graphics_output_protocol_64 *gop64,
> > struct efi_graphics_output_mode_info **info,
> > - unsigned long *size, u64 *fb_base)
> > + unsigned long *size, u64 *fb_base, u32 *mode_num)
> > {
> > struct efi_graphics_output_protocol_mode_64 *mode;
> > efi_graphics_output_protocol_query_mode query_mode;
> > @@ -224,6 +228,7 @@ __gop_query64(efi_system_table_t *sys_table_arg,
> > return status;
> >
> > *fb_base = mode->frame_buffer_base;
> > + *mode_num = mode->mode;
> > return status;
> > }
> >
> > @@ -233,6 +238,7 @@ setup_gop64(efi_system_table_t *sys_table_arg, struct \
> > screen_info *si, {
> > struct efi_graphics_output_protocol_64 *gop64, *first_gop;
> > unsigned long nr_gops;
> > + u32 mode_num;
> > u16 width, height;
> > u32 pixels_per_scan_line;
> > u32 ext_lfb_base;
> > @@ -266,7 +272,7 @@ setup_gop64(efi_system_table_t *sys_table_arg, struct \
> > screen_info *si, conout_found = true;
> >
> > status = __gop_query64(sys_table_arg, gop64, &info, &size,
> > - ¤t_fb_base);
> > + ¤t_fb_base, &mode_num);
> > if (status == EFI_SUCCESS && (!first_gop || conout_found) &&
> > info->pixel_format != PIXEL_BLT_ONLY) {
> > /*
> > @@ -300,6 +306,8 @@ setup_gop64(efi_system_table_t *sys_table_arg, struct \
> > screen_info *si, /* EFI framebuffer */
> > si->orig_video_isVGA = VIDEO_TYPE_EFI;
> >
> > + si->efi_gop_mode_high = (mode_num & 0xff00) >> 16;
> > + si->efi_gop_mode_low = (mode_num & 0xff);
> > si->lfb_width = width;
> > si->lfb_height = height;
> > si->lfb_base = fb_base;
> > diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
> > index ba906876cc4..3250f3f9152 100644
> > --- a/drivers/video/fbdev/efifb.c
> > +++ b/drivers/video/fbdev/efifb.c
> > @@ -331,12 +331,23 @@ efifb_attr_decl(height, "%u");
> > efifb_attr_decl(width, "%u");
> > efifb_attr_decl(depth, "%u");
> >
> > +static ssize_t gop_mode_show(struct device *dev,
> > + struct device_attribute *attr,
> > + char *buf)
> > +{
> > + return sprintf(buf, "0x%04hx%04hx\n",
> > + screen_info.efi_gop_mode_high,
> > + screen_info.efi_gop_mode_low);
> > +}
> > +static DEVICE_ATTR_RO(gop_mode);
> > +
> > static struct attribute *efifb_attrs[] = {
> > &dev_attr_base.attr,
> > &dev_attr_linelength.attr,
> > &dev_attr_width.attr,
> > &dev_attr_height.attr,
> > &dev_attr_depth.attr,
> > + &dev_attr_gop_mode.attr,
> > NULL
> > };
> > ATTRIBUTE_GROUPS(efifb);
> > diff --git a/include/uapi/linux/screen_info.h b/include/uapi/linux/screen_info.h
> > index 87e5c086938..a8eb2d76167 100644
> > --- a/include/uapi/linux/screen_info.h
> > +++ b/include/uapi/linux/screen_info.h
> > @@ -18,7 +18,7 @@ struct screen_info {
> > __u8 flags; /* 0x08 */
> > __u8 unused2; /* 0x09 */
> > __u16 orig_video_ega_bx;/* 0x0a */
> > - __u16 unused3; /* 0x0c */
> > + __u16 efi_gop_mode_low; /* 0x0c */
> > __u8 orig_video_lines; /* 0x0e */
> > __u8 orig_video_isVGA; /* 0x0f */
> > __u16 orig_video_points;/* 0x10 */
> > @@ -45,7 +45,7 @@ struct screen_info {
> > __u16 vesa_attributes; /* 0x34 */
> > __u32 capabilities; /* 0x36 */
> > __u32 ext_lfb_base; /* 0x3a */
> > - __u8 _reserved[2]; /* 0x3e */
> > + __u16 efi_gop_mode_high;/* 0x3e */
> > } __attribute__((packed));
> >
> > #define VIDEO_TYPE_MDA 0x10 /* Monochrome Text Display */
> > diff --git a/Documentation/ABI/testing/sysfs-firmware-efi \
> > b/Documentation/ABI/testing/sysfs-firmware-efi index e794eac32a9..6c169599863 \
> > 100644
> > --- a/Documentation/ABI/testing/sysfs-firmware-efi
> > +++ b/Documentation/ABI/testing/sysfs-firmware-efi
> > @@ -28,3 +28,18 @@ Description: Displays the physical addresses of all EFI \
> > Configuration versions are always printed first, i.e. ACPI20 comes
> > before ACPI.
> > Users: dmidecode
> > +
> > +What: /sys/bus/platform/drivers/efi-framebuffer/efi-framebuffer.N/
> > +Date: October 2016
> > +Contact: linux-efi@vger.kernel.org
> > +Description: The characteristics of the EFI GOP framebuffer device.
> > +
> > + base: The physical address of the framebuffer memory.
> > + depth: The color depth of the framebuffer, in bits.
> > + height: The height of the displayed frame in pixels.
> > + linelength: The size of one line (i.e. the stride) of the
> > + framebuffer memory, in bytes.
> > + width: The width of the displayed frame in pixels.
> > + gop_mode: The index into the EFI GOP mode table for the mode in
> > + use during boot-up.
> > +Users: fwupd
> > --
> > 2.20.1
> >
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