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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Bhupesh Sharma <bhsharma@redhat.com>,
	Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Subject: Re: [PATCH 6/6] efi/earlycon: Remap entire framebuffer after page initialization
Date: Mon, 9 Dec 2019 14:12:42 -0500	[thread overview]
Message-ID: <20191209191242.GA3075464@rani.riverdale.lan> (raw)
In-Reply-To: <20191206165542.31469-7-ardb@kernel.org>

On Fri, Dec 06, 2019 at 04:55:42PM +0000, Ard Biesheuvel wrote:
> From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> 
> 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.
> 

Could the efi earlycon have an interaction with PCI resource allocation,
similar to what commit dcf8f5ce3165 ("drivers/fbdev/efifb: Allow BAR to
be moved instead of claiming it") fixed for efifb?

  parent reply	other threads:[~2019-12-09 19:12 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-06 16:55 [GIT PULL 0/6] EFI fixes for v5.5 Ard Biesheuvel
2019-12-06 16:55 ` [PATCH 1/6] efi/memreserve: register reservations as 'reserved' in /proc/iomem Ard Biesheuvel
2019-12-08 13:33   ` [tip: efi/urgent] efi/memreserve: Register " tip-bot2 for Ard Biesheuvel
2019-12-06 16:55 ` [PATCH 2/6] efi/gop: Return EFI_NOT_FOUND if there are no usable GOPs Ard Biesheuvel
2019-12-08 13:33   ` [tip: efi/urgent] " tip-bot2 for Arvind Sankar
2019-12-06 16:55 ` [PATCH 3/6] efi/gop: Return EFI_SUCCESS if a usable GOP was found Ard Biesheuvel
2019-12-08 13:33   ` [tip: efi/urgent] " tip-bot2 for Arvind Sankar
2019-12-06 16:55 ` [PATCH 4/6] efi/gop: Fix memory leak from __gop_query32/64 Ard Biesheuvel
2019-12-08 13:33   ` [tip: efi/urgent] efi/gop: Fix memory leak in __gop_query32/64() tip-bot2 for Arvind Sankar
2019-12-06 16:55 ` [PATCH 5/6] efi: fix type of unload field in efi_loaded_image_t Ard Biesheuvel
2019-12-08 13:33   ` [tip: efi/urgent] efi: Fix efi_loaded_image_t::unload type tip-bot2 for Arvind Sankar
2019-12-06 16:55 ` [PATCH 6/6] efi/earlycon: Remap entire framebuffer after page initialization Ard Biesheuvel
2019-12-08 13:33   ` [tip: efi/urgent] " tip-bot2 for Andy Shevchenko
2019-12-09 19:12   ` Arvind Sankar [this message]
2019-12-09 19:24     ` [PATCH 6/6] " Ard Biesheuvel
2019-12-10 20:05       ` Arvind Sankar
2019-12-11 11:26         ` Ard Biesheuvel
2019-12-11 15:55           ` Arvind Sankar

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