forked from Minki/linux
540f4c0e89
The UEFI Specification permits Graphics Output Protocol (GOP) instances
without direct framebuffer access. This is indicated in the Mode structure
with a PixelFormat enumeration value of PIXEL_BLT_ONLY. Given that the
kernel does not know how to drive a Blt() only framebuffer (which is only
permitted before ExitBootServices() anyway), we should disregard such
framebuffers when looking for a GOP instance that is suitable for use as
the boot console.
So modify the EFI GOP initialization to not use a PIXEL_BLT_ONLY instance,
preventing attempts later in boot to use an invalid screen_info.lfb_base
address.
Signed-off-by: Eugene Cohen <eugene@hp.com>
[ Moved the Blt() only check into the loop and clarified that Blt() only GOPs are unusable by the kernel. ]
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: <stable@vger.kernel.org> # v4.7+
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: leif.lindholm@linaro.org
Cc: linux-efi@vger.kernel.org
Cc: lorenzo.pieralisi@arm.com
Fixes: 9822504c1f ("efifb: Enable the efi-framebuffer platform driver ...")
Link: http://lkml.kernel.org/r/20170404152744.26687-2-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
357 lines
9.2 KiB
C
357 lines
9.2 KiB
C
/* -----------------------------------------------------------------------
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*
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* Copyright 2011 Intel Corporation; author Matt Fleming
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*
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* This file is part of the Linux kernel, and is made available under
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* the terms of the GNU General Public License version 2.
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*
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* ----------------------------------------------------------------------- */
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#include <linux/efi.h>
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#include <linux/screen_info.h>
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#include <asm/efi.h>
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#include <asm/setup.h>
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static void find_bits(unsigned long mask, u8 *pos, u8 *size)
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{
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u8 first, len;
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first = 0;
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len = 0;
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if (mask) {
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while (!(mask & 0x1)) {
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mask = mask >> 1;
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first++;
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}
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while (mask & 0x1) {
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mask = mask >> 1;
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len++;
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}
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}
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*pos = first;
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*size = len;
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}
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static void
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setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
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struct efi_pixel_bitmask pixel_info, int pixel_format)
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{
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if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
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si->lfb_depth = 32;
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si->lfb_linelength = pixels_per_scan_line * 4;
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si->red_size = 8;
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si->red_pos = 0;
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si->green_size = 8;
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si->green_pos = 8;
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si->blue_size = 8;
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si->blue_pos = 16;
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si->rsvd_size = 8;
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si->rsvd_pos = 24;
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} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
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si->lfb_depth = 32;
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si->lfb_linelength = pixels_per_scan_line * 4;
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si->red_size = 8;
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si->red_pos = 16;
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si->green_size = 8;
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si->green_pos = 8;
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si->blue_size = 8;
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si->blue_pos = 0;
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si->rsvd_size = 8;
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si->rsvd_pos = 24;
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} else if (pixel_format == PIXEL_BIT_MASK) {
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find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
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find_bits(pixel_info.green_mask, &si->green_pos,
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&si->green_size);
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find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
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find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
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&si->rsvd_size);
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si->lfb_depth = si->red_size + si->green_size +
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si->blue_size + si->rsvd_size;
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si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
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} else {
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si->lfb_depth = 4;
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si->lfb_linelength = si->lfb_width / 2;
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si->red_size = 0;
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si->red_pos = 0;
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si->green_size = 0;
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si->green_pos = 0;
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si->blue_size = 0;
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si->blue_pos = 0;
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si->rsvd_size = 0;
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si->rsvd_pos = 0;
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}
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}
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static efi_status_t
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__gop_query32(efi_system_table_t *sys_table_arg,
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struct efi_graphics_output_protocol_32 *gop32,
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struct efi_graphics_output_mode_info **info,
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unsigned long *size, u64 *fb_base)
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{
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struct efi_graphics_output_protocol_mode_32 *mode;
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efi_graphics_output_protocol_query_mode query_mode;
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efi_status_t status;
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unsigned long m;
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m = gop32->mode;
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mode = (struct efi_graphics_output_protocol_mode_32 *)m;
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query_mode = (void *)(unsigned long)gop32->query_mode;
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status = __efi_call_early(query_mode, (void *)gop32, mode->mode, size,
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info);
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if (status != EFI_SUCCESS)
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return status;
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*fb_base = mode->frame_buffer_base;
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return status;
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}
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static efi_status_t
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setup_gop32(efi_system_table_t *sys_table_arg, struct screen_info *si,
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efi_guid_t *proto, unsigned long size, void **gop_handle)
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{
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struct efi_graphics_output_protocol_32 *gop32, *first_gop;
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unsigned long nr_gops;
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u16 width, height;
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u32 pixels_per_scan_line;
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u32 ext_lfb_base;
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u64 fb_base;
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struct efi_pixel_bitmask pixel_info;
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int pixel_format;
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efi_status_t status = EFI_NOT_FOUND;
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u32 *handles = (u32 *)(unsigned long)gop_handle;
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int i;
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first_gop = NULL;
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gop32 = NULL;
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nr_gops = size / sizeof(u32);
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for (i = 0; i < nr_gops; i++) {
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struct efi_graphics_output_mode_info *info = NULL;
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efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
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bool conout_found = false;
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void *dummy = NULL;
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efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
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u64 current_fb_base;
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status = efi_call_early(handle_protocol, h,
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proto, (void **)&gop32);
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if (status != EFI_SUCCESS)
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continue;
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status = efi_call_early(handle_protocol, h,
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&conout_proto, &dummy);
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if (status == EFI_SUCCESS)
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conout_found = true;
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status = __gop_query32(sys_table_arg, gop32, &info, &size,
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¤t_fb_base);
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if (status == EFI_SUCCESS && (!first_gop || conout_found) &&
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info->pixel_format != PIXEL_BLT_ONLY) {
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/*
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* Systems that use the UEFI Console Splitter may
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* provide multiple GOP devices, not all of which are
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* backed by real hardware. The workaround is to search
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* for a GOP implementing the ConOut protocol, and if
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* one isn't found, to just fall back to the first GOP.
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*/
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width = info->horizontal_resolution;
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height = info->vertical_resolution;
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pixel_format = info->pixel_format;
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pixel_info = info->pixel_information;
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pixels_per_scan_line = info->pixels_per_scan_line;
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fb_base = current_fb_base;
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/*
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* Once we've found a GOP supporting ConOut,
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* don't bother looking any further.
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*/
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first_gop = gop32;
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if (conout_found)
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break;
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}
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}
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/* Did we find any GOPs? */
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if (!first_gop)
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goto out;
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/* EFI framebuffer */
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si->orig_video_isVGA = VIDEO_TYPE_EFI;
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si->lfb_width = width;
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si->lfb_height = height;
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si->lfb_base = fb_base;
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ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
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if (ext_lfb_base) {
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si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
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si->ext_lfb_base = ext_lfb_base;
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}
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si->pages = 1;
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setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
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si->lfb_size = si->lfb_linelength * si->lfb_height;
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si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
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out:
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return status;
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}
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static efi_status_t
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__gop_query64(efi_system_table_t *sys_table_arg,
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struct efi_graphics_output_protocol_64 *gop64,
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struct efi_graphics_output_mode_info **info,
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unsigned long *size, u64 *fb_base)
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{
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struct efi_graphics_output_protocol_mode_64 *mode;
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efi_graphics_output_protocol_query_mode query_mode;
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efi_status_t status;
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unsigned long m;
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m = gop64->mode;
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mode = (struct efi_graphics_output_protocol_mode_64 *)m;
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query_mode = (void *)(unsigned long)gop64->query_mode;
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status = __efi_call_early(query_mode, (void *)gop64, mode->mode, size,
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info);
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if (status != EFI_SUCCESS)
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return status;
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*fb_base = mode->frame_buffer_base;
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return status;
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}
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static efi_status_t
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setup_gop64(efi_system_table_t *sys_table_arg, struct screen_info *si,
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efi_guid_t *proto, unsigned long size, void **gop_handle)
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{
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struct efi_graphics_output_protocol_64 *gop64, *first_gop;
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unsigned long nr_gops;
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u16 width, height;
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u32 pixels_per_scan_line;
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u32 ext_lfb_base;
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u64 fb_base;
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struct efi_pixel_bitmask pixel_info;
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int pixel_format;
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efi_status_t status = EFI_NOT_FOUND;
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u64 *handles = (u64 *)(unsigned long)gop_handle;
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int i;
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first_gop = NULL;
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gop64 = NULL;
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nr_gops = size / sizeof(u64);
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for (i = 0; i < nr_gops; i++) {
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struct efi_graphics_output_mode_info *info = NULL;
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efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
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bool conout_found = false;
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void *dummy = NULL;
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efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
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u64 current_fb_base;
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status = efi_call_early(handle_protocol, h,
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proto, (void **)&gop64);
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if (status != EFI_SUCCESS)
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continue;
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status = efi_call_early(handle_protocol, h,
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&conout_proto, &dummy);
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if (status == EFI_SUCCESS)
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conout_found = true;
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status = __gop_query64(sys_table_arg, gop64, &info, &size,
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¤t_fb_base);
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if (status == EFI_SUCCESS && (!first_gop || conout_found) &&
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info->pixel_format != PIXEL_BLT_ONLY) {
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/*
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* Systems that use the UEFI Console Splitter may
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* provide multiple GOP devices, not all of which are
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* backed by real hardware. The workaround is to search
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* for a GOP implementing the ConOut protocol, and if
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* one isn't found, to just fall back to the first GOP.
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*/
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width = info->horizontal_resolution;
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height = info->vertical_resolution;
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pixel_format = info->pixel_format;
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pixel_info = info->pixel_information;
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pixels_per_scan_line = info->pixels_per_scan_line;
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fb_base = current_fb_base;
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/*
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* Once we've found a GOP supporting ConOut,
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* don't bother looking any further.
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*/
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first_gop = gop64;
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if (conout_found)
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break;
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}
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}
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/* Did we find any GOPs? */
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if (!first_gop)
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goto out;
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/* EFI framebuffer */
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si->orig_video_isVGA = VIDEO_TYPE_EFI;
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si->lfb_width = width;
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si->lfb_height = height;
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si->lfb_base = fb_base;
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ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
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if (ext_lfb_base) {
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si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
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si->ext_lfb_base = ext_lfb_base;
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}
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si->pages = 1;
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setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
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si->lfb_size = si->lfb_linelength * si->lfb_height;
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si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
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out:
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return status;
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}
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/*
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* See if we have Graphics Output Protocol
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*/
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efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg,
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struct screen_info *si, efi_guid_t *proto,
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unsigned long size)
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{
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efi_status_t status;
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void **gop_handle = NULL;
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status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
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size, (void **)&gop_handle);
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if (status != EFI_SUCCESS)
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return status;
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status = efi_call_early(locate_handle,
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EFI_LOCATE_BY_PROTOCOL,
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proto, NULL, &size, gop_handle);
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if (status != EFI_SUCCESS)
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goto free_handle;
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if (efi_is_64bit()) {
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status = setup_gop64(sys_table_arg, si, proto, size,
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gop_handle);
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} else {
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status = setup_gop32(sys_table_arg, si, proto, size,
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gop_handle);
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}
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free_handle:
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efi_call_early(free_pool, gop_handle);
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return status;
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}
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