From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- Documentation/fb/vesafb.rst | 190 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 Documentation/fb/vesafb.rst (limited to 'Documentation/fb/vesafb.rst') diff --git a/Documentation/fb/vesafb.rst b/Documentation/fb/vesafb.rst new file mode 100644 index 000000000..f890a4f56 --- /dev/null +++ b/Documentation/fb/vesafb.rst @@ -0,0 +1,190 @@ +=============== +What is vesafb? +=============== + +This is a generic driver for a graphic framebuffer on intel boxes. + +The idea is simple: Turn on graphics mode at boot time with the help +of the BIOS, and use this as framebuffer device /dev/fb0, like the m68k +(and other) ports do. + +This means we decide at boot time whenever we want to run in text or +graphics mode. Switching mode later on (in protected mode) is +impossible; BIOS calls work in real mode only. VESA BIOS Extensions +Version 2.0 are required, because we need a linear frame buffer. + +Advantages: + + * It provides a nice large console (128 cols + 48 lines with 1024x768) + without using tiny, unreadable fonts. + * You can run XF68_FBDev on top of /dev/fb0 (=> non-accelerated X11 + support for every VBE 2.0 compliant graphics board). + * Most important: boot logo :-) + +Disadvantages: + + * graphic mode is slower than text mode... + + +How to use it? +============== + +Switching modes is done using the vga=... boot parameter. Read +Documentation/admin-guide/svga.rst for details. + +You should compile in both vgacon (for text mode) and vesafb (for +graphics mode). Which of them takes over the console depends on +whenever the specified mode is text or graphics. + +The graphic modes are NOT in the list which you get if you boot with +vga=ask and hit return. The mode you wish to use is derived from the +VESA mode number. Here are those VESA mode numbers: + +====== ======= ======= ======== ========= +colors 640x480 800x600 1024x768 1280x1024 +====== ======= ======= ======== ========= +256 0x101 0x103 0x105 0x107 +32k 0x110 0x113 0x116 0x119 +64k 0x111 0x114 0x117 0x11A +16M 0x112 0x115 0x118 0x11B +====== ======= ======= ======== ========= + + +The video mode number of the Linux kernel is the VESA mode number plus +0x200: + + Linux_kernel_mode_number = VESA_mode_number + 0x200 + +So the table for the Kernel mode numbers are: + +====== ======= ======= ======== ========= +colors 640x480 800x600 1024x768 1280x1024 +====== ======= ======= ======== ========= +256 0x301 0x303 0x305 0x307 +32k 0x310 0x313 0x316 0x319 +64k 0x311 0x314 0x317 0x31A +16M 0x312 0x315 0x318 0x31B +====== ======= ======= ======== ========= + +To enable one of those modes you have to specify "vga=ask" in the +lilo.conf file and rerun LILO. Then you can type in the desired +mode at the "vga=ask" prompt. For example if you like to use +1024x768x256 colors you have to say "305" at this prompt. + +If this does not work, this might be because your BIOS does not support +linear framebuffers or because it does not support this mode at all. +Even if your board does, it might be the BIOS which does not. VESA BIOS +Extensions v2.0 are required, 1.2 is NOT sufficient. You will get a +"bad mode number" message if something goes wrong. + +1. Note: LILO cannot handle hex, for booting directly with + "vga=mode-number" you have to transform the numbers to decimal. +2. Note: Some newer versions of LILO appear to work with those hex values, + if you set the 0x in front of the numbers. + +X11 +=== + +XF68_FBDev should work just fine, but it is non-accelerated. Running +another (accelerated) X-Server like XF86_SVGA might or might not work. +It depends on X-Server and graphics board. + +The X-Server must restore the video mode correctly, else you end up +with a broken console (and vesafb cannot do anything about this). + + +Refresh rates +============= + +There is no way to change the vesafb video mode and/or timings after +booting linux. If you are not happy with the 60 Hz refresh rate, you +have these options: + + * configure and load the DOS-Tools for the graphics board (if + available) and boot linux with loadlin. + * use a native driver (matroxfb/atyfb) instead if vesafb. If none + is available, write a new one! + * VBE 3.0 might work too. I have neither a gfx board with VBE 3.0 + support nor the specs, so I have not checked this yet. + + +Configuration +============= + +The VESA BIOS provides protected mode interface for changing +some parameters. vesafb can use it for palette changes and +to pan the display. It is turned off by default because it +seems not to work with some BIOS versions, but there are options +to turn it on. + +You can pass options to vesafb using "video=vesafb:option" on +the kernel command line. Multiple options should be separated +by comma, like this: "video=vesafb:ypan,inverse" + +Accepted options: + +inverse use inverse color map + +========= ====================================================================== +ypan enable display panning using the VESA protected mode + interface. The visible screen is just a window of the + video memory, console scrolling is done by changing the + start of the window. + + pro: + + * scrolling (fullscreen) is fast, because there is + no need to copy around data. + + kontra: + + * scrolling only parts of the screen causes some + ugly flicker effects (boot logo flickers for + example). + +ywrap Same as ypan, but assumes your gfx board can wrap-around + the video memory (i.e. starts reading from top if it + reaches the end of video memory). Faster than ypan. + +redraw Scroll by redrawing the affected part of the screen, this + is the safe (and slow) default. + + +vgapal Use the standard vga registers for palette changes. + This is the default. +pmipal Use the protected mode interface for palette changes. + +mtrr:n Setup memory type range registers for the vesafb framebuffer + where n: + + - 0 - disabled (equivalent to nomtrr) (default) + - 1 - uncachable + - 2 - write-back + - 3 - write-combining + - 4 - write-through + + If you see the following in dmesg, choose the type that matches the + old one. In this example, use "mtrr:2". +... +mtrr: type mismatch for e0000000,8000000 old: write-back new: + write-combining +... + +nomtrr disable mtrr + +vremap:n + Remap 'n' MiB of video RAM. If 0 or not specified, remap memory + according to video mode. (2.5.66 patch/idea by Antonino Daplas + reversed to give override possibility (allocate more fb memory + than the kernel would) to 2.4 by tmb@iki.fi) + +vtotal:n If the video BIOS of your card incorrectly determines the total + amount of video RAM, use this option to override the BIOS (in MiB). +========= ====================================================================== + +Have fun! + +Gerd Knorr + +Minor (mostly typo) changes +by Nico Schmoigl -- cgit v1.2.3