diff options
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/dynamic-debug-howto.rst | 35 | ||||
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 54 | ||||
| -rw-r--r-- | Documentation/admin-guide/laptops/sonypi.rst | 2 | ||||
| -rw-r--r-- | Documentation/admin-guide/md.rst | 2 |
4 files changed, 58 insertions, 35 deletions
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst index 095a63892257..9c2f096ed1d8 100644 --- a/Documentation/admin-guide/dynamic-debug-howto.rst +++ b/Documentation/admin-guide/dynamic-debug-howto.rst @@ -38,12 +38,12 @@ You can view the currently configured behaviour in the *prdbg* catalog:: :#> head -n7 /proc/dynamic_debug/control # filename:lineno [module]function flags format - init/main.c:1179 [main]initcall_blacklist =_ "blacklisting initcall %s\012 - init/main.c:1218 [main]initcall_blacklisted =_ "initcall %s blacklisted\012" - init/main.c:1424 [main]run_init_process =_ " with arguments:\012" - init/main.c:1426 [main]run_init_process =_ " %s\012" - init/main.c:1427 [main]run_init_process =_ " with environment:\012" - init/main.c:1429 [main]run_init_process =_ " %s\012" + init/main.c:1179 [main]initcall_blacklist =_ "blacklisting initcall %s\n" + init/main.c:1218 [main]initcall_blacklisted =_ "initcall %s blacklisted\n" + init/main.c:1424 [main]run_init_process =_ " with arguments:\n" + init/main.c:1426 [main]run_init_process =_ " %s\n" + init/main.c:1427 [main]run_init_process =_ " with environment:\n" + init/main.c:1429 [main]run_init_process =_ " %s\n" The 3rd space-delimited column shows the current flags, preceded by a ``=`` for easy use with grep/cut. ``=p`` shows enabled callsites. @@ -59,10 +59,10 @@ query/commands to the control file. Example:: :#> ddcmd '-p; module main func run* +p' :#> grep =p /proc/dynamic_debug/control - init/main.c:1424 [main]run_init_process =p " with arguments:\012" - init/main.c:1426 [main]run_init_process =p " %s\012" - init/main.c:1427 [main]run_init_process =p " with environment:\012" - init/main.c:1429 [main]run_init_process =p " %s\012" + init/main.c:1424 [main]run_init_process =p " with arguments:\n" + init/main.c:1426 [main]run_init_process =p " %s\n" + init/main.c:1427 [main]run_init_process =p " with environment:\n" + init/main.c:1429 [main]run_init_process =p " %s\n" Error messages go to console/syslog:: @@ -109,10 +109,19 @@ The match-spec's select *prdbgs* from the catalog, upon which to apply the flags-spec, all constraints are ANDed together. An absent keyword is the same as keyword "*". +Note that since the match-spec can be empty, the flags are checked 1st, +then the pairs of keyword and value. Flag errs will hide keyword errs:: -A match specification is a keyword, which selects the attribute of -the callsite to be compared, and a value to compare against. Possible -keywords are::: + bash-5.2# ddcmd mod bar +foo + dyndbg: read 13 bytes from userspace + dyndbg: query 0: "mod bar +foo" mod:* + dyndbg: unknown flag 'o' + dyndbg: flags parse failed + dyndbg: processed 1 queries, with 0 matches, 1 errs + +So a match-spec is a keyword, which selects the attribute of the +callsite to be compared, and a value to compare against. Possible +keywords are:: match-spec ::= 'func' string | 'file' string | diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 8c22943e51c0..f3bba3cc173e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2580,23 +2580,41 @@ Kernel parameters Don't force hardware IOMMU usage when it is not needed. (default). + merge + Do scatter-gather (SG) merging. Implies "force" + (experimental). + + nomerge + Don't do scatter-gather (SG) merging. + biomerge + Do scatter-gather (SG) merging. Implies "force" + (experimental). [same as "merge"] + panic + Always panic when IOMMU overflows. + nopanic - merge - nomerge + Don't panic on IOMMU overflows. + + pt + Use passththrough mode by default + (Equivalent to iommu.passthrough=1) + + nopt + Use translated mode for DMA by default + (Equivalent to iommu.passthrough=0) soft Use software bounce buffering (SWIOTLB) (default for Intel machines). This can be used to prevent the usage of an available hardware IOMMU. - pt - nopt - nobypass [PPC/POWERNV] - Disable IOMMU bypass, using IOMMU for PCI devices. + usedac + Use the DAC on VIA PCI bridge + (default: disable the VIA PCI bridge DAC) - AMD Gart HW IOMMU-specific options: + AMD Gart HW IOMMU-specific options: (CONFIG_GART_IOMMU) <size> Set the size of the remapping area in bytes. @@ -2604,6 +2622,9 @@ Kernel parameters allowed Overwrite iommu off workarounds for specific chipsets + force + Overwrite iommu off workarounds for specific chipsets + fullflush Flush IOMMU on each allocation (default). @@ -2614,21 +2635,16 @@ Kernel parameters Allocate an own aperture over RAM with size 32MB<<order. (default: order=1, i.e. 64MB) - merge - Do scatter-gather (SG) merging. Implies "force" - (experimental). - - nomerge - Don't do scatter-gather (SG) merging. - noaperture Ask the IOMMU not to touch the aperture for AGP. noagp Don't initialize the AGP driver and use full aperture. - panic - Always panic when IOMMU overflows. + iommu= [PPC/POWERNV] + + nobypass + Disable IOMMU bypass, using IOMMU for PCI devices. iommu.forcedac= [ARM64,X86,EARLY] Control IOVA allocation for PCI devices. Format: { "0" | "1" } @@ -6770,8 +6786,6 @@ Kernel parameters restrictions other than those given by hardware at the cost of significant additional memory use for tables. - sa1100ir [NET] - See drivers/net/irda/sa1100_ir.c. sched_proxy_exec= [KNL] Enables or disables "proxy execution" style @@ -7406,10 +7420,10 @@ Kernel parameters Set the STI (builtin display/keyboard on the HP-PARISC machines) console (graphic card) which should be used as the initial boot-console. - See also comment in drivers/video/console/sticore.c. + See also comment in drivers/video/sticore.c. sti_font= [HW] - See comment in drivers/video/console/sticore.c. + See comment in drivers/video/sticore.c. stifb= [HW] Format: bpp:<bpp1>[:<bpp2>[:<bpp3>...]] diff --git a/Documentation/admin-guide/laptops/sonypi.rst b/Documentation/admin-guide/laptops/sonypi.rst index 7541f56e0007..fb8f4a30ddce 100644 --- a/Documentation/admin-guide/laptops/sonypi.rst +++ b/Documentation/admin-guide/laptops/sonypi.rst @@ -89,7 +89,7 @@ statically linked into the kernel). Those options are: set to 0xffffffff, meaning that all possible events will be tried. You can use the following bits to construct your own event mask (from - drivers/char/sonypi.h):: + include/linux/sonypi.h):: SONYPI_JOGGER_MASK 0x0001 SONYPI_CAPTURE_MASK 0x0002 diff --git a/Documentation/admin-guide/md.rst b/Documentation/admin-guide/md.rst index dc7eab191caa..003fd34f73bc 100644 --- a/Documentation/admin-guide/md.rst +++ b/Documentation/admin-guide/md.rst @@ -734,7 +734,7 @@ also have They should be scaled by the bitmap_chunksize. sync_speed_min, sync_speed_max - This are similar to ``/proc/sys/dev/raid/speed_limit_{min,max}`` + These are similar to ``/proc/sys/dev/raid/speed_limit_{min,max}`` however they only apply to the particular array. If no value has been written to these, or if the word ``system`` |