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host linux kernel patch to support allocation of big usb buffers

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j4nn 2025-03-08 19:59:20 +01:00
commit 6487b333d5
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misc/host-linux-kernel-x86-support-big-usb-transfers.patch Normal file
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add ARCH_FORCE_MAX_ORDER kconfig option to x86 arch
this is cloned from arch/arm64/Kconfig, the default value is set to 14
in order to allow big usb transfers, like 16MB or more
usbcore.usbfs_memory_mb=0 kernel command line option is needed too
in order to enable big usb transfers
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 05c82fd5d..a34c71d51 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2077,6 +2077,37 @@ config ARCH_SUPPORTS_CRASH_DUMP
config ARCH_SUPPORTS_CRASH_HOTPLUG
def_bool y
+# include/linux/mmzone.h requires the following to be true:
+#
+# MAX_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS
+#
+# so the maximum value of MAX_ORDER is SECTION_SIZE_BITS - PAGE_SHIFT:
+#
+# | SECTION_SIZE_BITS | PAGE_SHIFT | max MAX_ORDER | default MAX_ORDER |
+# ----+-------------------+--------------+-----------------+--------------------+
+# 4K | 27 | 12 | 15 | 10 |
+# 16K | 27 | 14 | 13 | 11 |
+# 64K | 29 | 16 | 13 | 13 |
+config ARCH_FORCE_MAX_ORDER
+ int
+ default "13" if ARM64_64K_PAGES
+ default "11" if ARM64_16K_PAGES
+ default "14"
+ help
+ The kernel page allocator limits the size of maximal physically
+ contiguous allocations. The limit is called MAX_ORDER and it
+ defines the maximal power of two of number of pages that can be
+ allocated as a single contiguous block. This option allows
+ overriding the default setting when ability to allocate very
+ large blocks of physically contiguous memory is required.
+
+ The maximal size of allocation cannot exceed the size of the
+ section, so the value of MAX_ORDER should satisfy
+
+ MAX_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS
+
+ Don't change if unsure.
+
config PHYSICAL_START
hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
default "0x1000000"