[PATCH 5.4 024/165] efi/earlycon: Remap entire framebuffer after page initialization

Greg Kroah-Hartman
2020-01-11T10:21:37Z

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

[ Upstream commit b418d660bb9798d2249ac6a46c844389ef50b6a5 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/firmware/efi/earlycon.c | 40 +++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)

diff --git a/drivers/firmware/efi/earlycon.c b/drivers/firmware/efi/earlycon.c
index c9a0efca17b0..d4077db6dc97 100644
--- a/drivers/firmware/efi/earlycon.c
+++ b/drivers/firmware/efi/earlycon.c
@@ -13,18 +13,57 @@

#include <asm/early_ioremap.h>

+static const struct console *earlycon_console __initdata;
static const struct font_desc *font;
static u32 efi_x, efi_y;
static u64 fb_base;
static pgprot_t fb_prot;
+static void *efi_fb;
+
+/*
+ * EFI earlycon needs to use early_memremap() to map the framebuffer.
+ * But early_memremap() is not usable for 'earlycon=efifb keep_bootcon',
+ * memremap() should be used instead. memremap() will be available after
+ * paging_init() which is earlier than initcall callbacks. Thus adding this
+ * early initcall function early_efi_map_fb() to map the whole EFI framebuffer.
+ */
+static int __init efi_earlycon_remap_fb(void)
+{
+ /* bail if there is no bootconsole or it has been disabled already */
+ if (!earlycon_console || !(earlycon_console->flags & CON_ENABLED))
+ return 0;
+
+ if (pgprot_val(fb_prot) == pgprot_val(PAGE_KERNEL))
+ efi_fb = memremap(fb_base, screen_info.lfb_size, MEMREMAP_WB);
+ else
+ efi_fb = memremap(fb_base, screen_info.lfb_size, MEMREMAP_WC);
+
+ return efi_fb ? 0 : -ENOMEM;
+}
+early_initcall(efi_earlycon_remap_fb);
+
+static int __init efi_earlycon_unmap_fb(void)
+{
+ /* unmap the bootconsole fb unless keep_bootcon has left it enabled */
+ if (efi_fb && !(earlycon_console->flags & CON_ENABLED))
+ memunmap(efi_fb);
+ return 0;
+}
+late_initcall(efi_earlycon_unmap_fb);

static __ref void *efi_earlycon_map(unsigned long start, unsigned long len)
{
+ if (efi_fb)
+ return efi_fb + start;
+
return early_memremap_prot(fb_base + start, len, pgprot_val(fb_prot));
}

static __ref void efi_earlycon_unmap(void *addr, unsigned long len)
{
+ if (efi_fb)
+ return;
+
early_memunmap(addr, len);
}

@@ -201,6 +240,7 @@ static int __init efi_earlycon_setup(struct earlycon_device *device,
efi_earlycon_scroll_up();

device->con->write = efi_earlycon_write;
+ earlycon_console = device->con;
return 0;
}
EARLYCON_DECLARE(efifb, efi_earlycon_setup);
--
2.20.1