Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next-queued

Git got absolutely destroyed with all our cherry-picking from
drm-intel-next-queued to various branches. It ended up insert

Merge remote-tracking branch 'airlied/drm-next' into drm-intel-next-queued

Git got absolutely destroyed with all our cherry-picking from
drm-intel-next-queued to various branches. It ended up inserting
intel_crtc_page_flip 2x even in intel_display.c.

Backmerge to get back to sanity.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

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Merge tag 'v4.7-rc1' into patchwork

Linux 4.7-rc1

* tag 'v4.7-rc1': (10534 commits)
Linux 4.7-rc1
hash_string: Fix zero-length case for !DCACHE_WORD_ACCESS
Rename other copy of hash_string to

Merge tag 'v4.7-rc1' into patchwork

Linux 4.7-rc1

* tag 'v4.7-rc1': (10534 commits)
Linux 4.7-rc1
hash_string: Fix zero-length case for !DCACHE_WORD_ACCESS
Rename other copy of hash_string to hashlen_string
hpfs: implement the show_options method
affs: fix remount failure when there are no options changed
hpfs: fix remount failure when there are no options changed
fs: fix binfmt_aout.c build error
h8300: Add <asm/hash.h>
microblaze: Add <asm/hash.h>
m68k: Add <asm/hash.h>
<linux/hash.h>: Add support for architecture-specific functions
fs/namei.c: Improve dcache hash function
Eliminate bad hash multipliers from hash_32() and hash_64()
Change hash_64() return value to 32 bits
<linux/sunrpc/svcauth.h>: Define hash_str() in terms of hashlen_string()
fs/namei.c: Add hashlen_string() function
Pull out string hash to <linux/stringhash.h>
Revert "platform/chrome: chromeos_laptop: Add Leon Touch"
i2c: dev: use after free in detach
MIPS: Add missing FROZEN hotplug notifier transitions
...

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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
"Highlights:

1) Support SPI based w5100 devices, from Akinobu Mita.

2) Partial

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:
"Highlights:

1) Support SPI based w5100 devices, from Akinobu Mita.

2) Partial Segmentation Offload, from Alexander Duyck.

3) Add GMAC4 support to stmmac driver, from Alexandre TORGUE.

4) Allow cls_flower stats offload, from Amir Vadai.

5) Implement bpf blinding, from Daniel Borkmann.

6) Optimize _ASYNC_ bit twiddling on sockets, unless the socket is
actually using FASYNC these atomics are superfluous. From Eric
Dumazet.

7) Run TCP more preemptibly, also from Eric Dumazet.

8) Support LED blinking, EEPROM dumps, and rxvlan offloading in mlx5e
driver, from Gal Pressman.

9) Allow creating ppp devices via rtnetlink, from Guillaume Nault.

10) Improve BPF usage documentation, from Jesper Dangaard Brouer.

11) Support tunneling offloads in qed, from Manish Chopra.

12) aRFS offloading in mlx5e, from Maor Gottlieb.

13) Add RFS and RPS support to SCTP protocol, from Marcelo Ricardo
Leitner.

14) Add MSG_EOR support to TCP, this allows controlling packet
coalescing on application record boundaries for more accurate
socket timestamp sampling. From Martin KaFai Lau.

15) Fix alignment of 64-bit netlink attributes across the board, from
Nicolas Dichtel.

16) Per-vlan stats in bridging, from Nikolay Aleksandrov.

17) Several conversions of drivers to ethtool ksettings, from Philippe
Reynes.

18) Checksum neutral ILA in ipv6, from Tom Herbert.

19) Factorize all of the various marvell dsa drivers into one, from
Vivien Didelot

20) Add VF support to qed driver, from Yuval Mintz"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1649 commits)
Revert "phy dp83867: Fix compilation with CONFIG_OF_MDIO=m"
Revert "phy dp83867: Make rgmii parameters optional"
r8169: default to 64-bit DMA on recent PCIe chips
phy dp83867: Make rgmii parameters optional
phy dp83867: Fix compilation with CONFIG_OF_MDIO=m
bpf: arm64: remove callee-save registers use for tmp registers
asix: Fix offset calculation in asix_rx_fixup() causing slow transmissions
switchdev: pass pointer to fib_info instead of copy
net_sched: close another race condition in tcf_mirred_release()
tipc: fix nametable publication field in nl compat
drivers: net: Don't print unpopulated net_device name
qed: add support for dcbx.
ravb: Add missing free_irq() calls to ravb_close()
qed: Remove a stray tab
net: ethernet: fec-mpc52xx: use phy_ethtool_{get|set}_link_ksettings
net: ethernet: fec-mpc52xx: use phydev from struct net_device
bpf, doc: fix typo on bpf_asm descriptions
stmmac: hardware TX COE doesn't work when force_thresh_dma_mode is set
net: ethernet: fs-enet: use phy_ethtool_{get|set}_link_ksettings
net: ethernet: fs-enet: use phydev from struct net_device
...

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Merge tag 'mac80211-next-for-davem-2016-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next into master

To synchronize with Kalle, here's just a big change that affects
all d

Merge tag 'mac80211-next-for-davem-2016-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next into master

To synchronize with Kalle, here's just a big change that affects
all drivers - removing the duplicated enum ieee80211_band and
replacing it by enum nl80211_band. On top of that, just a small
documentation update.

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Merge branch 'bpf-tracepoints'

Alexei Starovoitov says:

====================
allow bpf attach to tracepoints

Hi Steven, Peter,

v1->v2: addressed Peter's comments:
- fixed wording in patch 1, adde

Merge branch 'bpf-tracepoints'

Alexei Starovoitov says:

====================
allow bpf attach to tracepoints

Hi Steven, Peter,

v1->v2: addressed Peter's comments:
- fixed wording in patch 1, added ack
- refactored 2nd patch into 3:
2/10 remove unused __perf_addr macro which frees up
an argument in perf_trace_buf_submit
3/10 split perf_trace_buf_prepare into alloc and update parts, so that bpf
programs don't have to pay performance penalty for update of struct trace_entry
which is not going to be accessed by bpf
4/10 actual addition of bpf filter to perf tracepoint handler is now trivial
and bpf prog can be used as proper filter of tracepoints

v1 cover:
last time we discussed bpf+tracepoints it was a year ago [1] and the reason
we didn't proceed with that approach was that bpf would make arguments
arg1, arg2 to trace_xx(arg1, arg2) call to be exposed to bpf program
and that was considered unnecessary extension of abi. Back then I wanted
to avoid the cost of buffer alloc and field assign part in all
of the tracepoints, but looks like when optimized the cost is acceptable.
So this new apporach doesn't expose any new abi to bpf program.
The program is looking at tracepoint fields after they were copied
by perf_trace_xx() and described in /sys/kernel/debug/tracing/events/xxx/format
We made a tool [2] that takes arguments from /sys/.../format and works as:
$ tplist.py -v random:urandom_read
int got_bits;
int pool_left;
int input_left;
Then these fields can be copy-pasted into bpf program like:
struct urandom_read {
__u64 hidden_pad;
int got_bits;
int pool_left;
int input_left;
};
and the program can use it:
SEC("tracepoint/random/urandom_read")
int bpf_prog(struct urandom_read *ctx)
{
return ctx->pool_left > 0 ? 1 : 0;
}
This way the program can access tracepoint fields faster than
equivalent bpf+kprobe program, which is the main goal of these patches.

Patch 1-4 are simple changes in perf core side, please review.
I'd like to take the whole set via net-next tree, since the rest of
the patches might conflict with other bpf work going on in net-next
and we want to avoid cross-tree merge conflicts.
Alternatively we can put patches 1-4 into both tip and net-next.

Patch 9 is an example of access to tracepoint fields from bpf prog.
Patch 10 is a micro benchmark for bpf+kprobe vs bpf+tracepoint.

Note that for actual tracing tools the user doesn't need to
run tplist.py and copy-paste fields manually. The tools do it
automatically. Like argdist tool [3] can be used as:
$ argdist -H 't:block:block_rq_complete():u32:nr_sector'
where 'nr_sector' is name of tracepoint field taken from
/sys/kernel/debug/tracing/events/block/block_rq_complete/format
and appropriate bpf program is generated on the fly.

[1] http://thread.gmane.org/gmane.linux.kernel.api/8127/focus=8165
[2] https://github.com/iovisor/bcc/blob/master/tools/tplist.py
[3] https://github.com/iovisor/bcc/blob/master/tools/argdist.py
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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samples/bpf: add tracepoint vs kprobe performance tests

the first microbenchmark does
fd=open("/proc/self/comm");
for() {
write(fd, "test");
}
and on 4 cpus in parallel:

samples/bpf: add tracepoint vs kprobe performance tests

the first microbenchmark does
fd=open("/proc/self/comm");
for() {
write(fd, "test");
}
and on 4 cpus in parallel:
writes per sec
base (no tracepoints, no kprobes) 930k
with kprobe at __set_task_comm() 420k
with tracepoint at task:task_rename 730k

For kprobe + full bpf program manully fetches oldcomm, newcomm via bpf_probe_read.
For tracepint bpf program does nothing, since arguments are copied by tracepoint.

2nd microbenchmark does:
fd=open("/dev/urandom");
for() {
read(fd, buf);
}
and on 4 cpus in parallel:
reads per sec
base (no tracepoints, no kprobes) 300k
with kprobe at urandom_read() 279k
with tracepoint at random:urandom_read 290k

bpf progs attached to kprobe and tracepoint are noop.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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