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authorYinghai Lu <yhlu.kernel.send@gmail.com>2008-04-29 03:52:33 -0700
committerThomas Gleixner <tglx@linutronix.de>2008-05-25 10:55:09 +0200
commit95ffa2438d0e9c48779f0106b1c0eb36165e759c (patch)
tree63829c04435fd99fb655a0d1b94fbd2094549ceb /arch/x86/Kconfig
parent0dbfafa5fcd4dd189e2adc7b6ed9e0405e846d79 (diff)
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/Kconfig26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index fe361ae7ef2..97a1764a3d2 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"