x86: mtrr cleanup for converting continuous to discrete - auto detect v4 (12031a62) · Commits · 戴 / test

Loop through mtrr chunk_size and gran_size from 1M to 2G to find out the optimal value so user does not need to add mtrr_chunk_size and mtrr_gran_size to the kernel command line. If optimal value is not found, print out all list to help select less optimal value. Add mtrr_spare_reg_nr= so user could set 2 instead of 1, if the card need more entries. v2: find the one with more spare entries v3: fix hole_basek offset v4: tight the compare between range and range_new loop stop with 4g Signed-off-by:

Yinghai Lu <yhlu.kernel@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Gabriel C <nix.or.die@googlemail.com> Cc: Mika Fischer <mika.fischer@zoopnet.de> Signed-off-by:

Thomas Gleixner <tglx@linutronix.de> Signed-off-by:

Ingo Molnar <mingo@elte.hu>

Documentation/kernel-parameters.txt

+11 −2

Original line number	Diff line number	Diff line
		@@ -610,8 +610,17 @@ and is between 256 and 4096 characters. It is defined in the file
		that could hold holes aka. UC entries.

		mtrr_gran_size=nn[KMG] [X86]
		used for mtrr cleanup. It is granity of mtrr block.
		Big value could prevent small alignment use up MTRRs.
		Used for mtrr cleanup. It is granularity of mtrr block.
		Default is 1.
		Large value could prevent small alignment from
		using up MTRRs.

		mtrr_spare_reg_nr=n [X86]
		Format: <integer>
		Range: 0,7 : spare reg number
		Default : 1
		Used for mtrr cleanup. It is spare mtrr entries number.
		Set to 2 or more if your graphical card needs more.

		disable_mtrr_trim [X86, Intel and AMD only]
		By default the kernel will trim any uncacheable

arch/x86/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -1117,6 +1117,15 @@ config MTRR_SANITIZER_ENABLE_DEFAULT
		help
		Enable mtrr cleanup default value

		config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
		int "MTRR cleanup spare reg num (0-7)"
		range 0 7
		default "1"
		depends on MTRR_SANITIZER
		help
		mtrr cleanup spare entries default, it can be changed via
		mtrr_spare_reg_nr=

		config X86_PAT
		bool
		prompt "x86 PAT support"

arch/x86/kernel/cpu/mtrr/main.c

+464 −146

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