kernel.git/drivers/video/console/vgacon.c, branch linux-3.2.y

vgacon.c: add cond reschedule points in vgacon_do_font_op

2013-07-27T04:34:18Z

commit 7e6d72c15ff4cc0c27573901bb05f9eddbd71ed4 upstream. Booting a 64-vcpu KVM guest, with CONFIG_PREEMPT_VOLUNTARY, can result in a soft lockup: BUG: soft lockup - CPU#41 stuck for 67s! [setfont:1505] RIP: 0010:[] [] vgacon_do_font_op.clone.0+0x1ba/0x550 This is due to the 8192 (cmapsz) IO operations taking longer than expected due to lock contention in QEMU. Add conditional resched points in between writes allowing other tasks to execute. Signed-off-by: Marcelo Tosatti Signed-off-by: Dave Airlie [bwh: Backported to 3.2: add #include , already present upstream] Signed-off-by: Ben Hutchings

vgacon/vt: clear buffer attributes when we load a 512 character font (v2)

2013-03-06T03:23:50Z

commit 2a2483072393b27f4336ab068a1f48ca19ff1c1e upstream. When we switch from 256->512 byte font rendering mode, it means the current contents of the screen is being reinterpreted. The bit that holds the high bit of the 9-bit font, may have been previously set, and thus the new font misrenders. The problem case we see is grub2 writes spaces with the bit set, so it ends up with data like 0x820, which gets reinterpreted into 0x120 char which the font translates into G with a circumflex. This flashes up on screen at boot and is quite ugly. A current side effect of this patch though is that any rendering on the screen changes color to a slightly darker color, but at least the screen no longer corrupts. v2: as suggested by hpa, always clear the attribute space, whether we are are going to or from 512 chars. Signed-off-by: Dave Airlie Signed-off-by: Ben Hutchings

locking, video: Annotate vga console lock as raw

2011-09-13T09:12:04Z

The vga_lock lock can be taken in atomic context and therefore cannot be preempted on -rt - annotate it. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar

video: fix some comments in drivers/video/console/vgacon.c

2011-01-25T06:10:21Z

Now vgacon_scrollback_startup() uses slab, not bootmem, the comment above it is obsolete, so does __init_refok. Signed-off-by: WANG Cong Signed-off-by: Paul Mundt

vgacon: check for efi machine

2011-01-13T16:03:12Z

It seems there is a small problem of VGA palette corruption on EFI machine. When the kernel initializes the architecture, it checks if the machine is a EFI machine and assumes that a VGA console can exist. When it initializes the console in vgacon_startup it checks if it can really use the VGA console. I think this is where a check is missing. Currently, the function can fail if a VESA boot mode is detected but not if a EFI boot mode was used. Thus vgacon_startup() doesn't fail and initialize the video card for a real VGA mode. This function changes the first 16entries of the VGA palette. When the efifb driver kicks in, the palette is not restored to default ramp value, thus the 16 first entry remain in a modified state. The following patch prevent this corruption. Signed-off-by: Yannick Heneault Cc: Dave Airlie Cc: "H. Peter Anvin" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

BKL: remove extraneous #include

2010-11-17T16:59:32Z

The big kernel lock has been removed from all these files at some point, leaving only the #include. Remove this too as a cleanup. Signed-off-by: Arnd Bergmann Signed-off-by: Linus Torvalds

tty: fix console_sem lock order

2010-08-10T20:47:43Z

vgacon_do_font_op releases and reacquires the BTM while holding console_sem. This violates the rule that BTM has to be the outer lock whenever we hold both. There does not seem to be any reason to give up the BTM here, so just stop doing that. Signed-off-by: Arnd Bergmann Cc: Alan Cox Signed-off-by: Greg Kroah-Hartman

tty: replace BKL with a new tty_lock

2010-08-10T20:47:43Z

As a preparation for replacing the big kernel lock in the TTY layer, wrap all the callers in new macros tty_lock, tty_lock_nested and tty_unlock. Signed-off-by: Arnd Bergmann Cc: Alan Cox Signed-off-by: Greg Kroah-Hartman

console/vgacon.c: mark file-local symbol static

2010-03-06T19:26:46Z

warning: symbol 'vgacon_text_mode_force' was not declared. Should it be static? Signed-off-by: Thiago Farina Acked-by: Matthew Garrett Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

vgacon: Add support for setting the default cursor state

2009-11-13T23:55:02Z

Pass the vga cursor state to the vt layer, ensuring that we don't hide the cursor when the bootloader has deliberately disabled it. Signed-off-by: Matthew Garrett LKML-Reference: <1258142222-16092-3-git-send-email-mjg@redhat.com> Signed-off-by: H. Peter Anvin