Documentation: Add powerpc options for spec_store_bypass_disable

[platform/kernel/linux-rpi.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 638342d..4bb6004 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -256,7 +256,7 @@
                                (may crash computer or cause data corruption)
 
        ALSA            [HW,ALSA]
-                       See Documentation/sound/alsa/alsa-parameters.txt
+                       See Documentation/sound/alsa-configuration.rst
 
        alignment=      [KNL,ARM]
                        Allow the default userspace alignment fault handler
@@ -2926,9 +2926,6 @@
                        This will also cause panics on machine check exceptions.
                        Useful together with panic=30 to trigger a reboot.
 
-       OSS             [HW,OSS]
-                       See Documentation/sound/oss/oss-parameters.txt
-
        page_owner=     [KNL] Boot-time page_owner enabling option.
                        Storage of the information about who allocated
                        each page is disabled in default. With this switch,
@@ -4063,6 +4060,8 @@
                        This parameter controls whether the Speculative Store
                        Bypass optimization is used.
 
+                       On x86 the options are:
+
                        on      - Unconditionally disable Speculative Store Bypass
                        off     - Unconditionally enable Speculative Store Bypass
                        auto    - Kernel detects whether the CPU model contains an
@@ -4078,12 +4077,20 @@
                        seccomp - Same as "prctl" above, but all seccomp threads
                                  will disable SSB unless they explicitly opt out.
 
-                       Not specifying this option is equivalent to
-                       spec_store_bypass_disable=auto.
-
                        Default mitigations:
                        X86:    If CONFIG_SECCOMP=y "seccomp", otherwise "prctl"
 
+                       On powerpc the options are:
+
+                       on,auto - On Power8 and Power9 insert a store-forwarding
+                                 barrier on kernel entry and exit. On Power7
+                                 perform a software flush on kernel entry and
+                                 exit.
+                       off     - No action.
+
+                       Not specifying this option is equivalent to
+                       spec_store_bypass_disable=auto.
+
        spia_io_base=   [HW,MTD]
        spia_fio_base=
        spia_pedr=
@@ -4335,7 +4342,7 @@
                        [FTRACE] Set and start specified trace events in order
                        to facilitate early boot debugging. The event-list is a
                        comma separated list of trace events to enable. See
-                       also Documentation/trace/events.txt
+                       also Documentation/trace/events.rst
 
        trace_options=[option-list]
                        [FTRACE] Enable or disable tracer options at boot.
@@ -4350,7 +4357,7 @@
 
                              trace_options=stacktrace
 
-                       See also Documentation/trace/ftrace.txt "trace options"
+                       See also Documentation/trace/ftrace.rst "trace options"
                        section.
 
        tp_printk[FTRACE]
@@ -4849,3 +4856,8 @@
        xirc2ps_cs=     [NET,PCMCIA]
                        Format:
                        <irq>,<irq_mask>,<io>,<full_duplex>,<do_sound>,<lockup_hack>[,<irq2>[,<irq3>[,<irq4>]]]
+
+       xhci-hcd.quirks         [USB,KNL]
+                       A hex value specifying bitmask with supplemental xhci
+                       host controller quirks. Meaning of each bit can be
+                       consulted in header drivers/usb/host/xhci.h.