src/sys/powerpc, branch releng/10.2

MFC r282213:

2015-06-21T06:28:26Z

Add kern.racct.enable tunable and RACCT_DISABLED config option. The point of this is to be able to add RACCT (with RACCT_DISABLED) to GENERIC, to avoid having to rebuild the kernel to use rctl(8). MFC r282901: Build GENERIC with RACCT/RCTL support by default. Note that it still needs to be enabled by adding "kern.racct.enable=1" to /boot/loader.conf. Note those two are MFC-ed together, because the latter one changes the name of RACCT_DISABLED option to RACCT_DEFAULT_TO_DISABLED. Should have committed the renaming separately... Relnotes: yes Sponsored by: The FreeBSD Foundation

MFC r276480, r276485, r276498, r277225, r277226, r277227, r277230,

2015-06-06T09:28:40Z

r277637, and r283149 (by emaste@). r276485 is the real change here, the rest deal with the fallout of mp_ring's reliance on 64b atomics. Use the incorrectly spelled 'eigth' from struct pkthdr in this branch instead of MFC'ing r261733, which would have renamed the field of a public structure in a -STABLE branch. --- r276480: Temporarily unplug cxgbe(4) from !amd64 builds. r276485: cxgbe(4): major tx rework. a) Front load as much work as possible in if_transmit, before any driver lock or software queue has to get involved. b) Replace buf_ring with a brand new mp_ring (multiproducer ring). This is specifically for the tx multiqueue model where one of the if_transmit producer threads becomes the consumer and other producers carry on as usual. mp_ring is implemented as standalone code and it should be possible to use it in any driver with tx multiqueue. It also has: - the ability to enqueue/dequeue multiple items. This might become significant if packet batching is ever implemented. - an abdication mechanism to allow a thread to give up writing tx descriptors and have another if_transmit thread take over. A thread that's writing tx descriptors can end up doing so for an unbounded time period if a) there are other if_transmit threads continuously feeding the sofware queue, and b) the chip keeps up with whatever the thread is throwing at it. - accurate statistics about interesting events even when the stats come at the expense of additional branches/conditional code. The NIC txq lock is uncontested on the fast path at this point. I've left it there for synchronization with the control events (interface up/down, modload/unload). c) Add support for "type 1" coalescing work request in the normal NIC tx path. This work request is optimized for frames with a single item in the DMA gather list. These are very common when forwarding packets. Note that netmap tx in cxgbe already uses these "type 1" work requests. d) Do not request automatic cidx updates every 32 descriptors. Instead, request updates via bits in individual work requests (still every 32 descriptors approximately). Also, request an automatic final update when the queue idles after activity. This means NIC tx reclaim is still performed lazily but it will catch up quickly as soon as the queue idles. This seems to be the best middle ground and I'll probably do something similar for netmap tx as well. e) Implement a faster tx path for WRQs (used by TOE tx and control queues, _not_ by the normal NIC tx). Allow work requests to be written directly to the hardware descriptor ring if room is available. I will convert t4_tom and iw_cxgbe modules to this faster style gradually. r276498: cxgbe(4): remove buf_ring specific restriction on the txq size. r277225: Make cxgbe(4) buildable with the gcc in base. r277226: Allow cxgbe(4) to be built on i386. Driver attach will succeed only on a subset of i386 systems. r277227: Plug cxgbe(4) back into !powerpc && !arm builds, instead of building it on amd64 only. r277230: Build cxgbe(4) on powerpc64 too. r277637: Make sure the compiler flag to get cxgbe(4) to compile with gcc is used only when gcc is being used. This is what r277225 should have been.

MFC 281266:

2015-06-02T14:54:53Z

Move the 32-bit compatible procfs types from freebsd32.h to and export them to userland. - Define __HAVE_REG32 on platforms that define a reg32 structure and check for this in to control when to export prstatus32, etc. - Add prstatus32_t and prpsinfo32_t typedefs for the 32-bit structures. libbfd looks for these types, and having them fixes 'gcore' in gdb of a 32-bit process on a 64-bit platform. - Use the structure definitions from in gcore's elf32 core dump code instead of duplicating the definitions.

MFC r282120:

2015-05-05T19:47:17Z

The add_bounce_page() function can be called when loading physical pages which pass a NULL virtual address. If the BUS_DMA_KEEP_PG_OFFSET flag is set, use the physical address to compute the page offset instead. The physical address should always be valid when adding bounce pages and should contain the same page offset like the virtual address. Submitted by: Svatopluk Kraus Reviewed by: jhb@

MFC r274670, r274671, r276168:

2015-02-14T21:16:19Z

Moves all the duplicate code to a single function. Verify for invalid modes and unwanted flags before pass the new flags to driver. Make gpio_default_map_gpios() static. No functional changes. Improves the GPIO API description a little bit. gpio_pin_max must return the maximum supported pin number and not the total number of pins on the system.

MFC r273799:

2015-02-14T20:37:33Z

Make the GPIO children attach to the first unit available and not only to unit 0. This fix a bug where a GPIO controller could fail to attach its children (gpioc and gpiobus) if another GPIO driver attach first.

MFC r275779, r275963, r276101, r276161, r276297:

2015-02-12T00:25:33Z

Move ofw_cpu.c to sys/dev/ofw so that it can be used by other architectures. Add driver for CPU frequency/voltage control on the Raspberry Pi. On initialization, do not use bcm_mbox_intr() to read the pending messages. This fixes the hang that happens on boot while initializing the cpufreq on Raspberry Pi.

MFC r278001:

2015-02-07T08:47:15Z

Do not qualify the mcontext_t *mcp argument for set_mcontext(9) as const.

MFC r266969 and r276717:

2015-02-05T20:03:02Z

Add 64-bit DMA support in the XHCI controller driver. - Fix some comments and whitespaces while at it. - Add support for PAE.

MFC r277792:

2015-02-03T00:29:58Z

Fix bug in mapppings of multiple pages exposed by updates to the VSCSI support in QEMU. Each page of a many page mapping was getting mapped to the same physical address, which is not the desired behavior.