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Message-ID: <20150204121805.GA18368@linuxteamdev.amer.dell.com>
Date: Wed, 4 Feb 2015 07:18:10 -0500
From: Parmeshwr Prasad <parmeshwr_prasad@...l.com>
To: Borislav Petkov <bp@...en8.de>,
Matt Fleming <matt@...sole-pimps.org>,
Randy Dunlap <rdunlap@...radead.org>,
Jon Masters <jonathan@...masters.org>,
Laszlo Ersek <lersek@...hat.com>,
Dave Young <dyoung@...hat.com>,
linux-efi <linux-efi@...r.kernel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Matt Fleming <matt.fleming@...el.com>,
Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
lkml <linux-kernel@...r.kernel.org>, parmeshwr_prasad@...l.com
Subject: Re: [PATCH] efi, x86: Add a "debug" option to the efi= cmdline
Some messages from efifb also should be suppressed. It will be better if we can move them under
efi=debug kernel parameter.
Please review the following patch.
>From 7fbac896ab87f1b37646ac2f49bb8216ec330642 Mon Sep 17 00:00:00 2001
From: Parmeshwr Prasad <parmeshwr_prasad@...l.com>
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@...l.com>
---
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
Fri, Jan 30, 2015 at 12:06:13PM -0600, Randy Dunlap wrote:
> On 01/30/15 08:43, Borislav Petkov wrote:
> > From: Borislav Petkov <bp@...e.de>
> > Date: Mon, 26 Jan 2015 19:49:59 +0100
> > Subject: [PATCH] efi, x86: Add a "debug" option to the efi= cmdline
> >
>
> Please update Documentation/kernel-parameters.txt also.
>
> > ... and hide the memory regions dump behind it. Make it default-off.
> >
> > Signed-off-by: Borislav Petkov <bp@...e.de>
> > Link: http://lkml.kernel.org/r/20141209095843.GA3990@pd.tnic
> > ---
> > arch/x86/platform/efi/efi.c | 5 ++++-
> > include/linux/efi.h | 1 +
> > 2 files changed, 5 insertions(+), 1 deletion(-)
> >
> > 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
> > /*
> >
>
>
> --
> ~Randy
> --
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