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| author | Yinghai Lu <yhlu.kernel.send@gmail.com> | 2008-04-29 03:52:33 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-25 10:55:09 +0200 |
| commit | 95ffa2438d0e9c48779f0106b1c0eb36165e759c (patch) | |
| tree | 63829c04435fd99fb655a0d1b94fbd2094549ceb /arch/x86/Kconfig | |
| parent | 0dbfafa5fcd4dd189e2adc7b6ed9e0405e846d79 (diff) | |
| download | lwn-95ffa2438d0e9c48779f0106b1c0eb36165e759c.tar.gz lwn-95ffa2438d0e9c48779f0106b1c0eb36165e759c.zip | |
x86: mtrr cleanup for converting continuous to discrete layout, v8
some BIOS like to use continus MTRR layout, and X driver can not add
WB entries for graphical cards when 4g or more RAM installed.
the patch will change MTRR to discrete.
mtrr_chunk_size= could be used to have smaller continuous block to hold holes.
default is 256m, could be set according to size of graphics card memory.
mtrr_gran_size= could be used to send smallest mtrr block to avoid run out of MTRRs
v2: fix -1 for UC checking
v3: default to disable, and need use enable_mtrr_cleanup to enable this feature
skip the var state change warning.
remove next_basek in range_to_mtrr()
v4: correct warning mask.
v5: CONFIG_MTRR_SANITIZER
v6: fix 1g, 2g, 512 aligment with extra hole
v7: gran_sizek to prevent running out of MTRRs.
v8: fix hole_basek caculation caused when removing next_basek
gran_sizek using when basek is 0.
need to apply
[PATCH] x86: fix trimming e820 with MTRR holes.
right after this one.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index fe361ae7ef2f..97a1764a3d20 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1092,6 +1092,32 @@ config MTRR See <file:Documentation/mtrr.txt> for more information. +config MTRR_SANITIZER + def_bool y + prompt "MTRR cleanup support" + depends on MTRR + help + Convert MTRR layout from continuous to discrete, so some X driver + could add WB entries. + + Say N here if you see bootup problems (boot crash, boot hang, + spontaneous reboots). + + Could be disabled with disable_mtrr_cleanup. Also mtrr_chunk_size + could be used to send largest mtrr entry size for continuous block + to hold holes (aka. UC entries) + + If unsure, say Y. + +config MTRR_SANITIZER_ENABLE_DEFAULT + def_bool y + prompt "Enable MTRR cleanup by default" + depends on MTRR_SANITIZER + help + Enable mtrr cleanup by default + + If unsure, say Y. + config X86_PAT bool prompt "x86 PAT support" |