Load instructions using ASI_PNF or other no-fault ASIs should not
cause a SIGSEGV or SIGBUS.

A garden variety unmapped address follows the TSB miss path, and when
no valid mapping is found in the process page tables, the miss handler
checks to see if the access was via a no-fault ASI.  It then fixes up
the target register with a zero, and skips the no-fault load
instruction.

But different paths are taken for data access exceptions and alignment
traps, and these do not respect the no-fault ASI. We add checks in
these paths for the no-fault ASI, and fix up the target register and
TPC just like in the TSB miss case.

Signed-off-by: Rob Gardner <rob.gardner@oracle.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

For many sun4v processor types, reading or writing a privileged register
has a latency of 40 to 70 cycles.  Use a combination of the low-latency
allclean, otherw, normalw, and nop instructions in etrap and rtrap to
replace 2 rdpr and 5 wrpr instructions and improve etrap/rtrap
performance.  allclean, otherw, and normalw are available on NG2 and
later processors.

The average ticks to execute the flush windows trap ("ta 0x3") with and
without this patch on select platforms:

 CPU            Not patched     Patched    % Latency Reduction

 NG2            1762            1558            -11.58
 NG4            3619            3204            -11.47
 M7             3015            2624            -12.97
 SPARC64-X      829             770              -7.12

Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Make this const as it is not modified anywhere.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

of_device_id are not supposed to change at runtime. All functions
working with of_device_id provided by <linux/of.h> work with const
of_device_ids. So mark the const and __initconst.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

of_device_id are not supposed to change at runtime. All functions
working with of_device_id provided by <linux/of.h> work with const
of_device_ids. So mark the const and __initconst.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The tty_alloc_driver() function never returns NULL, it returns error
pointers on error.

Fixes: ce808b74

 ("sparc64: vcc: TTY driver initialization and cleanup")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Nitin Gupta says:

====================
sparc64: Add 16GB hugepage support

SPARC architecture supports 16G hugepages but the kernel did not
support these. This patch series adds support for it and also cleanes
up some page walk/alloc functions.

Patch 1/3: Core changes needed to add 16G hugepage support: To map a
  single 16G hugepage, two PUD entries are used. Each PUD entry maps
  8G portion of a 16G page. This page table encoding scheme is same as
  that used for hugepages at PMD level (8M, 256M and 2G pages) where
  each PMD entry points successively to 8M regions within a page.  No
  page table entries below the PUD level are allocated for 16G
  hugepage since those are not required.

  TSB entries for a 16G page are created at every 4M boundary since
  the HUGE_TSB is used for these pages which is configured with page
  size of 4M.  When walking page tables (on a TSB miss), bits [32:22]
  are transferred from vaddr to PUD to resolve addresses at 4M
  boundary. The resolved address mapping is then stored in HUGE_TSB.

Patch 2/3: get_user_pages() etc. are used for direct IO. These
  functions were not aware of hugepages at the PUD level and would try
  to continue walking page tables beyond the PUD level. Since 16G
  hugepages have page tables allocated till PUD level only, these
  accesses would result in invalid access. This patch adds the case
  for PUD huge pages to these functions.

Patch 3/3: Patch 1 added the case of PUD entry being huge in page
  table walk and alloc functions. This new case further increased
  nesting in these functions and made them harder to follow. This
  patch flattens these functions for better readability.

Cc: sparclinux@vger.kernel.org

Chagenlog v6 vs v5:
 - Move include of hvcalls.S after the trap table to avoid
   overflowing previous space (Anthony)
Changelog v5 vs v4:
 - Checking at PUD level for hugepage entry during page table walk is
    patched out if 16GB hugepages are not being used.
	Changelog v4 vs v3:
 - Added cover letter (patch 0/4) for patch series.

Changelog v3 vs v2:
 - Fixed email headers so the subject shows up correctly.

Changelog v2 vs v1:
 - Remove redundant brgez,pn (Bob Picco)
 - Remove unncessary label rename from 700 to 701 (Rob Gardner)
 - Add patch description (Paul)
 - Add 16G case to get_user_pages()
====================

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

Flatten out nested code structure in huge_pte_offset()
and huge_pte_alloc().

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Adds support for 16GB hugepage size. To use this page size
use kernel parameters as:

default_hugepagesz=16G hugepagesz=16G hugepages=10

Testing:

Tested with the stream benchmark which allocates 48G of
arrays backed by 16G hugepages and does RW operation on
them in parallel.

Orabug: 25362942

Cc: Anthony Yznaga <anthony.yznaga@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

get_user_pages() is used to do direct IO. It already
handles the case where the address range is backed
by PMD huge pages. This patch now adds the case where
the range could be backed by PUD huge pages.

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jag Raman says:

====================
sparc64: Enable Virtual Console Concentrator (VCC)

Patchset to enable Virtual Console Concentrator (VCC). VCC provides
access to the serial console of a guest domain. It creates a RAW
VIO/LDC link between the guest domain & primary through which serial
console data is shared.

This set addresses feedback provided by Dave Miller. Cleanup of
driver state is also addressed in this set. Patches updated
are 4, 5, 6 & 7.
====================

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

Add handlers to support TTY install & cleanup operations

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add handler to support TTY break_ctl operation

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add handler to support TTY chars_in_buffer operation

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add handlers to support TTY write & write_room operations

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add handler to support TTY hangup operation

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add handlers to support TTY open & close operations

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Enable event processing engine to handle LDC events

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add RX & TX timers to perform delayed/asynchronous LDC
read and write operations.

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Create sysfs attribute group to show the domain name and
send break command.

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Enables VCC port probe and removal to initialize and terminate
VCC ports respectively. When a device/port matching the VCC driver
is added, the probe function is invoked along with a reference
to the device. remove function is called when the device is
removed.

Also add APIs to cache and retrieve VCC ports from a VCC table

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Allocate and register TTY driver during module init. Cleanup
TTY driver during module exit.

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add C macros to print debug messages from VCC module

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Enables the Virtual Console Concentrator (VCC) module
in linux kernel

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Babu Moger says:

====================
sparc64: Update memcpy, memset etc. for M7/M8 architectures

This series of patches updates the memcpy, memset, copy_to_user, copy_from_user
etc for SPARC M7/M8 architecture.

New algorithm here takes advantage of the M7/M8 block init store ASIs, with much
more optimized way to improve the performance. More detail are in code comments.

Tested and compared the latency measured in ticks(NG4memcpy vs new M7memcpy).

1. Memset numbers(Aligned memset)

No.of bytes   NG4memset	   M7memset    	Delta ((B-A)/A)*100
	     (Avg.Ticks A) (Avg.Ticks B) (latency reduction)
  3		77		25		-67.53
  7		43		33		-23.25
  32		72		68		 -5.55
  128		164		44		-73.17
  256		335		68		-79.70
  512		511		220		-56.94
  1024		1552		627		-59.60
  2048		3515		1322		-62.38
  4096		6303		2472		-60.78
  8192		13118		4867		-62.89
  16384		26206		10371		-60.42
  32768		52501		18569		-64.63
  65536		100219		35899		-64.17

2. Memcpy numbers(Aligned memcpy)

No.of bytes   NG4memcpy	   M7memcpy    	Delta ((B-A)/A)*100
	     (Avg.Ticks A) (Avg.Ticks B) (latency reduction)
  3		20		19		-5
  7		29		27		-6.89
  32		30		28		-6.66
  128		89		69		-22.47
  256		142		143		 0.70
  512		341		283		-17.00
  1024		1588		655		-58.75
  2048		3553		1357		-61.80
  4096		7218		2590		-64.11
  8192		13701		5231		-61.82
  16384		28304		10716		-62.13
  32768		56516		22995		-59.31
  65536		115443		50840		-55.96

3. Memset numbers(un-aligned memset)

No.of bytes   NG4memset	   M7memset    	Delta ((B-A)/A)*100
	     (Avg.Ticks A) (Avg.Ticks B) (latency reduction)
  3		40		31		-22.5
  7		52		29		-44.2307692308
  32		89		86		-3.3707865169
  128		201		74		-63.184079602
  256		340		154		-54.7058823529
  512		961		335		-65.1404786681
  1024		1799		686		-61.8677042802
  2048		3575		1260		-64.7552447552
  4096		6560		2627		-59.9542682927
  8192		13161		6018		-54.273991338
  16384		26465		10439		-60.5554505951
  32768		52119		18649		-64.2184232238
  65536		101593		35724		-64.8361599717

4. Memcpy numbers(un-aligned memcpy)

No.of bytes   NG4memcpy	   M7memcpy    	Delta ((B-A)/A)*100
	     (Avg.Ticks A) (Avg.Ticks B) (latency reduction)
  3		26		19		-26.9230769231
  7		48		45		-6.25
  32		52		49		-5.7692307692
  128		284		334		17.6056338028
  256		430		482		12.0930232558
  512		646		690		6.8111455108
  1024		1051		1016		-3.3301617507
  2048		1787		1818		1.7347509793
  4096		3309		3376		2.0247809006
  8192		8151		7444		-8.673782358
  16384		34222		34556		0.9759803635
  32768		87851		95044		8.1877269468
  65536		158331		159572		0.7838010244

There is not much difference in numbers with Un-aligned copies
between NG4memcpy and M7memcpy because they both mostly use the
same algorithems.

v2:
 1. Fixed indentation issues found by David Miller
 2. Used ENTRY and ENDPROC for the labels in M7patch.S as suggested by David Miller
 3. Now M8 also will use M7memcpy. Also tested on M8 config.
 4. These patches are created on top of below M8 patches
    https://patchwork.ozlabs.org/patch/792661/
    https://patchwork.ozlabs.org/patch/792662/


    However, I did not see these patches in sparc-next tree. It may be in queue now.
    It is possible these patches might cause some build problems. It will resolve
    once all M8 patches are in sparc-next tree.

v0: Initial version
====================

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

Add accurate exception reporting in M7memcpy

Signed-off-by: Babu Moger <babu.moger@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

New algorithm that takes advantage of the M7/M8 block init store
ASI, ie, overlapping pipelines and miss buffer filling.
Full details in code comments.

Signed-off-by: Babu Moger <babu.moger@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Rename exception handlers to memcpy_xxx as these
are going to be used by new memcpy routines and these
handlers are not exclusive to NG4memcpy anymore.

Signed-off-by: Babu Moger <babu.moger@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Separate the exception handlers from NG4memcpy so that it can be
used with new memcpy routines. Make a separate file for all these handlers.

Signed-off-by: Babu Moger <babu.moger@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Update comments about the range the different
parts of the code copies, the original comments were wrong.

Introduce a few descriptive labels too.

No functional changes.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull networking fixes from David Miller:

 1) Fix handling of initial STATE message in TIPC, from Jon Paul Maloy.

 2) Fix stats handling in bcm_sysport_get_stats(), from Florian
    Fainelli.

 3) Reject 16777215 VNI value in geneve_validate(), from Girish
    Moodalbail.

 4) Fix initial IGMP sysctl setting regression, from Nikolay Borisov.

 5) Once a UFO fragmented frame is treated as UFO, we should continue
    doing so. Likewise once a frame has been segmented, we should
    continue doing that and not try to convert it to a UFO frame. From
    Willem de Bruijn.

 6) Test the AF_PACKET RX/TX ring pg_vec state under the socket lock to
    prevent races. From Willem de Bruijn.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  packet: fix tp_reserve race in packet_set_ring
  udp: consistently apply ufo or fragmentation
  net: sched: set xt_tgchk_param par.nft_compat as 0 in ipt_init_target
  igmp: Fix regression caused by igmp sysctl namespace code.
  geneve: maximum value of VNI cannot be used
  net: systemport: Fix software statistics for SYSTEMPORT Lite
  tipc: remove premature ESTABLISH FSM event at link synchronization

Updates to tp_reserve can race with reads of the field in
packet_set_ring. Avoid this by holding the socket lock during
updates in setsockopt PACKET_RESERVE.

This bug was discovered by syzkaller.

Fixes: 8913336a

 ("packet: add PACKET_RESERVE sockopt")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When iteratively building a UDP datagram with MSG_MORE and that
datagram exceeds MTU, consistently choose UFO or fragmentation.

Once skb_is_gso, always apply ufo. Conversely, once a datagram is
split across multiple skbs, do not consider ufo.

Sendpage already maintains the first invariant, only add the second.
IPv6 does not have a sendpage implementation to modify.

A gso skb must have a partial checksum, do not follow sk_no_check_tx
in udp_send_skb.

Found by syzkaller.

Fixes: e89e9cf5

 ("[IPv4/IPv6]: UFO Scatter-gather approach")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

It overflows the amount of space available in the initial .text section
of trap handler assembler in some configurations, resulting in build
failures.

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

Pull sparc updates from David Miller:

 1) Recognize M8 cpus, just basic chip ID matching, from Allen Pais.

 2) Prevent crashes when bringing up sunvdc virtual block devices in
    some environments. From Jim Quigley.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sunvdc: prevent sunvdc panic when mpgroup disk added to guest domain
  sparc64: Increase max_phys_bits to 51 and VA bits to 53 for M8.
  sparc64: recognize and support sparc M8 cpu type
  sparc64: properly name the cpu constants

Commit 55917a21 ("netfilter: x_tables: add context to know if
extension runs from nft_compat") introduced a member nft_compat to
xt_tgchk_param structure.

But it didn't set it's value for ipt_init_target. With unexpected
value in par.nft_compat, it may return unexpected result in some
target's checkentry.

This patch is to set all it's fields as 0 and only initialize the
non-zero fields in ipt_init_target.

v1->v2:
  As Wang Cong's suggestion, fix it by setting all it's fields as
  0 and only initializing the non-zero fields.

Fixes: 55917a21

 ("netfilter: x_tables: add context to know if extension runs from nft_compat")
Suggested-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Commit dcd87999 ("igmp: net: Move igmp namespace init to correct file")
moved the igmp sysctls initialization from tcp_sk_init to igmp_net_init. This
function is only called as part of per-namespace initialization, only if
CONFIG_IP_MULTICAST is defined, otherwise igmp_mc_init() call in ip_init is
compiled out, casuing the igmp pernet ops to not be registerd and those sysctl
being left initialized with 0. However, there are certain functions, such as
ip_mc_join_group which are always compiled and make use of some of those
sysctls. Let's do a partial revert of the aforementioned commit and move the
sysctl initialization into inet_init_net, that way they will always have
sane values.

Fixes: dcd87999 ("igmp: net: Move igmp namespace init to correct file")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=196595


Reported-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Geneve's Virtual Network Identifier (VNI) is 24 bit long, so the range
of values for it would be from 0 to 16777215 (2^24 -1).  However, one
cannot create a geneve device with VNI set to 16777215. This patch fixes
this issue.

Signed-off-by: Girish Moodalbail <girish.moodalbail@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

With SYSTEMPORT Lite we have holes in our statistics layout that make us
skip over the hardware MIB counters, bcm_sysport_get_stats() was not
taking that into account resulting in reporting 0 for all SW-maintained
statistics, fix this by skipping accordingly.

Fixes: 44a4524c

 ("net: systemport: Add support for SYSTEMPORT Lite")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>