It is better if we add some printk from efifb messages.
Please review the below patch.
>From 7fbac896ab87f1b37646ac2f49bb8216ec330642 Mon Sep 17 00:00:00 2001
From: Parmeshwr Prasad <parmeshwr_prasad@xxxxxxxx>
Date: Wed, 4 Feb 2015 06:50:32 -0500
Subject: [PATCH] efi, x86: Add a debug option to the efi= cmdline
Signed-off-by: Parmeshwr Prasad <parmeshwr_prasad@xxxxxxxx>
---
drivers/video/fbdev/efifb.c | 49 +++++++++++++++++++++++++--------------------
1 file changed, 27 insertions(+), 22 deletions(-)
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index 4bfff34..505bc56 100644
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -145,7 +145,8 @@ static int efifb_probe(struct platform_device *dev)
printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
return -ENODEV;
}
- printk(KERN_INFO "efifb: probing for efifb\n");
+ if (efi_enabled(EFI_DBG))
+ printk(KERN_INFO "efifb: probing for efifb\n");
/* just assume they're all unset if any are */
if (!screen_info.blue_size) {
@@ -224,20 +225,22 @@ static int efifb_probe(struct platform_device *dev)
err = -EIO;
goto err_release_fb;
}
-
- printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
- "using %dk, total %dk\n",
- efifb_fix.smem_start, info->screen_base,
- size_remap/1024, size_total/1024);
- printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
- efifb_defined.xres, efifb_defined.yres,
- efifb_defined.bits_per_pixel, efifb_fix.line_length,
- screen_info.pages);
+ if (efi_enabled(EFI_DBG)){
+ printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
+ "using %dk, total %dk\n",
+ efifb_fix.smem_start, info->screen_base,
+ size_remap/1024, size_total/1024);
+ printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
+ efifb_defined.xres, efifb_defined.yres,
+ efifb_defined.bits_per_pixel, efifb_fix.line_length,
+ screen_info.pages);
+ }
efifb_defined.xres_virtual = efifb_defined.xres;
efifb_defined.yres_virtual = efifb_fix.smem_len /
efifb_fix.line_length;
- printk(KERN_INFO "efifb: scrolling: redraw\n");
+ if (efi_enabled(EFI_DBG))
+ printk(KERN_INFO "efifb: scrolling: redraw\n");
efifb_defined.yres_virtual = efifb_defined.yres;
/* some dummy values for timing to make fbset happy */
@@ -255,17 +258,19 @@ static int efifb_probe(struct platform_device *dev)
efifb_defined.transp.offset = screen_info.rsvd_pos;
efifb_defined.transp.length = screen_info.rsvd_size;
- printk(KERN_INFO "efifb: %s: "
- "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
- "Truecolor",
- screen_info.rsvd_size,
- screen_info.red_size,
- screen_info.green_size,
- screen_info.blue_size,
- screen_info.rsvd_pos,
- screen_info.red_pos,
- screen_info.green_pos,
- screen_info.blue_pos);
+ if (efi_enabled(EFI_DBG)){
+ printk(KERN_INFO "efifb: %s: "
+ "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
+ "Truecolor",
+ screen_info.rsvd_size,
+ screen_info.red_size,
+ screen_info.green_size,
+ screen_info.blue_size,
+ screen_info.rsvd_pos,
+ screen_info.red_pos,
+ screen_info.green_pos,
+ screen_info.blue_pos);
+ }
efifb_fix.ypanstep = 0;
efifb_fix.ywrapstep = 0;
--
1.9.3
On Thu, Feb 05, 2015 at 04:44:41AM -0600, Borislav Petkov wrote:
> From: Borislav Petkov <bp@xxxxxxx>
> Subject: [PATCH v2] efi, x86: Add a "debug" option to the efi= cmdline
>
> ... and hide the memory regions dump behind it. Make it default-off.
>
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> Link: http://lkml.kernel.org/r/20141209095843.GA3990@xxxxxxx
> Acked-by: Laszlo Ersek <lersek@xxxxxxxxxx>
> Acked-by: Dave Young <dyoung@xxxxxxxxxx>
> ---
> Documentation/kernel-parameters.txt | 3 ++-
> arch/x86/platform/efi/efi.c | 5 ++++-
> include/linux/efi.h | 1 +
> 3 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 176d4fe4f076..101ab5601c2d 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1024,7 +1024,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> Format: {"off" | "on" | "skip[mbr]"}
>
> efi= [EFI]
> - Format: { "old_map", "nochunk", "noruntime" }
> + Format: { "old_map", "nochunk", "noruntime", "debug" }
> old_map [X86-64]: switch to the old ioremap-based EFI
> runtime services mapping. 32-bit still uses this one by
> default.
> @@ -1032,6 +1032,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> boot stub, as chunking can cause problems with some
> firmware implementations.
> noruntime : disable EFI runtime services support
> + debug: enable misc debug output
>
> efi_no_storage_paranoia [EFI; X86]
> Using this parameter you can use more than 50% of
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index dbc8627a5cdf..e859d56ce9f8 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -491,7 +491,8 @@ void __init efi_init(void)
> if (efi_memmap_init())
> return;
>
> - print_efi_memmap();
> + if (efi_enabled(EFI_DBG))
> + print_efi_memmap();
> }
>
> void __init efi_late_init(void)
> @@ -939,6 +940,8 @@ static int __init arch_parse_efi_cmdline(char *str)
> {
> if (parse_option_str(str, "old_map"))
> set_bit(EFI_OLD_MEMMAP, &efi.flags);
> + if (parse_option_str(str, "debug"))
> + set_bit(EFI_DBG, &efi.flags);
>
> return 0;
> }
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 0238d612750e..14cec75d7e74 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -940,6 +940,7 @@ extern int __init efi_setup_pcdp_console(char *);
> #define EFI_64BIT 5 /* Is the firmware 64-bit? */
> #define EFI_PARAVIRT 6 /* Access is via a paravirt interface */
> #define EFI_ARCH_1 7 /* First arch-specific bit */
> +#define EFI_DBG 8 /* Print additional debug info at runtime */
>
> #ifdef CONFIG_EFI
> /*
> --
> 2.2.0.33.gc18b867
>
> --
> Regards/Gruss,
> Boris.
>
> ECO tip #101: Trim your mails when you reply.
> --
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