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| author |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2019-12-06 16:55:42 +0000 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2019-12-08 12:42:19 +0100 |
| commit | b418d660bb9798d2249ac6a46c844389ef50b6a5 (patch) | |
| tree | a9471893ef19fde5fef722fbe5149d2a0584edb2 /kernel | |
| parent | efi: Fix efi_loaded_image_t::unload type (diff) | |
| download | linux-dev-b418d660bb9798d2249ac6a46c844389ef50b6a5.tar.xz linux-dev-b418d660bb9798d2249ac6a46c844389ef50b6a5.zip | |
efi/earlycon: Remap entire framebuffer after page initialization
When commit:
69c1f396f25b ("efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation")
moved the x86 specific EFI earlyprintk implementation to a shared location,
it also tweaked the behaviour. In particular, it dropped a trick with full
framebuffer remapping after page initialization, leading to two regressions:
1) very slow scrolling after page initialization,
2) kernel hang when the 'keep_bootcon' command line argument is passed.
Putting the tweak back fixes #2 and mitigates #1, i.e., it limits the slow
behavior to the early boot stages, presumably due to eliminating heavy
map()/unmap() operations per each pixel line on the screen.
[ ardb: ensure efifb is unmapped again unless keep_bootcon is in effect. ]
[ mingo: speling fixes. ]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>
Cc: Bhupesh Sharma <bhsharma@redhat.com>
Cc: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Cc: linux-efi@vger.kernel.org
Fixes: 69c1f396f25b ("efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation")
Link: https://lkml.kernel.org/r/20191206165542.31469-7-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions