diff options
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 33 | ||||
| -rw-r--r-- | Documentation/admin-guide/perf/imx-ddr.rst | 52 | ||||
| -rw-r--r-- | Documentation/admin-guide/sysctl/net.rst | 29 |
3 files changed, 78 insertions, 36 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 47d981a86e2f..520dedae7150 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1732,6 +1732,11 @@ Note that using this option lowers the security provided by tboot because it makes the system vulnerable to DMA attacks. + nobounce [Default off] + Disable bounce buffer for unstrusted devices such as + the Thunderbolt devices. This will treat the untrusted + devices as the trusted ones, hence might expose security + risks of DMA attacks. intel_idle.max_cstate= [KNL,HW,ACPI,X86] 0 disables intel_idle and fall back on acpi_idle. @@ -1811,7 +1816,7 @@ synchronously. iommu.passthrough= - [ARM64] Configure DMA to bypass the IOMMU by default. + [ARM64, X86] Configure DMA to bypass the IOMMU by default. Format: { "0" | "1" } 0 - Use IOMMU translation for DMA. 1 - Bypass the IOMMU for DMA. @@ -2373,7 +2378,7 @@ machvec= [IA-64] Force the use of a particular machine-vector (machvec) in a generic kernel. - Example: machvec=hpzx1_swiotlb + Example: machvec=hpzx1 machtype= [Loongson] Share the same kernel image file between different yeeloong laptop. @@ -3837,12 +3842,13 @@ RCU_BOOST is not set, valid values are 0-99 and the default is zero (non-realtime operation). - rcutree.rcu_nocb_leader_stride= [KNL] - Set the number of NOCB kthread groups, which - defaults to the square root of the number of - CPUs. Larger numbers reduces the wakeup overhead - on the per-CPU grace-period kthreads, but increases - that same overhead on each group's leader. + rcutree.rcu_nocb_gp_stride= [KNL] + Set the number of NOCB callback kthreads in + each group, which defaults to the square root + of the number of CPUs. Larger numbers reduce + the wakeup overhead on the global grace-period + kthread, but increases that same overhead on + each group's NOCB grace-period kthread. rcutree.qhimark= [KNL] Set threshold of queued RCU callbacks beyond which @@ -4047,6 +4053,10 @@ rcutorture.verbose= [KNL] Enable additional printk() statements. + rcupdate.rcu_cpu_stall_ftrace_dump= [KNL] + Dump ftrace buffer after reporting RCU CPU + stall warning. + rcupdate.rcu_cpu_stall_suppress= [KNL] Suppress RCU CPU stall warning messages. @@ -4090,6 +4100,13 @@ Run specified binary instead of /init from the ramdisk, used for early userspace startup. See initrd. + rdrand= [X86] + force - Override the decision by the kernel to hide the + advertisement of RDRAND support (this affects + certain AMD processors because of buggy BIOS + support, specifically around the suspend/resume + path). + rdt= [HW,X86,RDT] Turn on/off individual RDT features. List is: cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, l2cdp, diff --git a/Documentation/admin-guide/perf/imx-ddr.rst b/Documentation/admin-guide/perf/imx-ddr.rst new file mode 100644 index 000000000000..517a205abad6 --- /dev/null +++ b/Documentation/admin-guide/perf/imx-ddr.rst @@ -0,0 +1,52 @@ +===================================================== +Freescale i.MX8 DDR Performance Monitoring Unit (PMU) +===================================================== + +There are no performance counters inside the DRAM controller, so performance +signals are brought out to the edge of the controller where a set of 4 x 32 bit +counters is implemented. This is controlled by the CSV modes programed in counter +control register which causes a large number of PERF signals to be generated. + +Selection of the value for each counter is done via the config registers. There +is one register for each counter. Counter 0 is special in that it always counts +“time” and when expired causes a lock on itself and the other counters and an +interrupt is raised. If any other counter overflows, it continues counting, and +no interrupt is raised. + +The "format" directory describes format of the config (event ID) and config1 +(AXI filtering) fields of the perf_event_attr structure, see /sys/bus/event_source/ +devices/imx8_ddr0/format/. The "events" directory describes the events types +hardware supported that can be used with perf tool, see /sys/bus/event_source/ +devices/imx8_ddr0/events/. + e.g.:: + perf stat -a -e imx8_ddr0/cycles/ cmd + perf stat -a -e imx8_ddr0/read/,imx8_ddr0/write/ cmd + +AXI filtering is only used by CSV modes 0x41 (axid-read) and 0x42 (axid-write) +to count reading or writing matches filter setting. Filter setting is various +from different DRAM controller implementations, which is distinguished by quirks +in the driver. + +* With DDR_CAP_AXI_ID_FILTER quirk. + Filter is defined with two configuration parts: + --AXI_ID defines AxID matching value. + --AXI_MASKING defines which bits of AxID are meaningful for the matching. + 0：corresponding bit is masked. + 1: corresponding bit is not masked, i.e. used to do the matching. + + AXI_ID and AXI_MASKING are mapped on DPCR1 register in performance counter. + When non-masked bits are matching corresponding AXI_ID bits then counter is + incremented. Perf counter is incremented if + AxID && AXI_MASKING == AXI_ID && AXI_MASKING + + This filter doesn't support filter different AXI ID for axid-read and axid-write + event at the same time as this filter is shared between counters. + e.g.:: + perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd + perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd + + NOTE: axi_mask is inverted in userspace(i.e. set bits are bits to mask), and + it will be reverted in driver automatically. so that the user can just specify + axi_id to monitor a specific id, rather than having to specify axi_mask. + e.g.:: + perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12 diff --git a/Documentation/admin-guide/sysctl/net.rst b/Documentation/admin-guide/sysctl/net.rst index a7d44e71019d..287b98708a40 100644 --- a/Documentation/admin-guide/sysctl/net.rst +++ b/Documentation/admin-guide/sysctl/net.rst @@ -39,7 +39,6 @@ Table : Subdirectories in /proc/sys/net 802 E802 protocol ax25 AX25 ethernet Ethernet protocol rose X.25 PLP layer ipv4 IP version 4 x25 X.25 protocol - ipx IPX token-ring IBM token ring bridge Bridging decnet DEC net ipv6 IP version 6 tipc TIPC ========= =================== = ========== ================== @@ -401,33 +400,7 @@ interface. (network) that the route leads to, the router (may be directly connected), the route flags, and the device the route is using. - -5. IPX ------- - -The IPX protocol has no tunable values in proc/sys/net. - -The IPX protocol does, however, provide proc/net/ipx. This lists each IPX -socket giving the local and remote addresses in Novell format (that is -network:node:port). In accordance with the strange Novell tradition, -everything but the port is in hex. Not_Connected is displayed for sockets that -are not tied to a specific remote address. The Tx and Rx queue sizes indicate -the number of bytes pending for transmission and reception. The state -indicates the state the socket is in and the uid is the owning uid of the -socket. - -The /proc/net/ipx_interface file lists all IPX interfaces. For each interface -it gives the network number, the node number, and indicates if the network is -the primary network. It also indicates which device it is bound to (or -Internal for internal networks) and the Frame Type if appropriate. Linux -supports 802.3, 802.2, 802.2 SNAP and DIX (Blue Book) ethernet framing for -IPX. - -The /proc/net/ipx_route table holds a list of IPX routes. For each route it -gives the destination network, the router node (or Directly) and the network -address of the router (or Connected) for internal networks. - -6. TIPC +5. TIPC ------- tipc_rmem |
