[PATCH] efi, x86: Add a debug option to the efi= cmdline

[Parmeshwr Prasad]

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

  
 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@xxxxxxx>
> > 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@xxxxxxx>
> > Link: http://lkml.kernel.org/r/20141209095843.GA3990@xxxxxxx
> > ---
> >  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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