Commit Graph

185 Commits

Author SHA1 Message Date
Mark Johnston
33baed9452 Add a lockdep macro to the LinuxKPI.
Also fix some nearby style issues.

MFC after:	1 week
2017-06-21 18:08:36 +00:00
Mark Johnston
8504aa9852 Add kthread parking support to the LinuxKPI.
Submitted by:	kmacy (original version)
Reviewed by:	hselasky
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D11264
2017-06-18 19:22:05 +00:00
Mark Johnston
4eb18346d1 Avoid including list.h in LinuxKPI headers.
list.h includes a number of FreeBSD headers as a workaround for the
LIST_HEAD name collision. To reduce pollution, avoid including list.h
in commonly used headers when it is not explicitly needed.

Reviewed by:	hselasky
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D11249
2017-06-18 16:43:57 +00:00
Mark Johnston
8239734079 Remove prototypes for unimplemented LinuxKPI functions.
MFC after:	1 week
2017-06-17 22:52:23 +00:00
Mark Johnston
f67b5de754 Implement pci_disable_device() in the LinuxKPI.
Submitted by:	kmacy
MFC after:	2 weeks
2017-06-09 19:57:27 +00:00
Mark Johnston
465659643b Augment wait queue support in the LinuxKPI.
In particular:
- Don't evaluate event conditions with a sleepqueue lock held, since such
  code may attempt to acquire arbitrary locks.
- Fix the return value for wait_event_interruptible() in the case that the
  wait is interrupted by a signal.
- Implement wait_on_bit_timeout() and wait_on_atomic_t().
- Implement some functions used to test for pending signals.
- Implement a number of wait_event_*() variants and unify the existing
  implementations.
- Unify the mechanism used by wait_event_*() and schedule() to put the
  calling thread to sleep.

This is required to support updated DRM drivers. Thanks to hselasky for
finding and fixing a number of bugs in the original revision.

Reviewed by:	hselasky
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D10986
2017-06-09 19:41:12 +00:00
Justin Hibbits
864092bcaa Remove ARM and MIPS from linuxkpi ioremap_attr definition
ARM and MIPS fail universe builds.

ARM and MIPS are missing the following:
* VM_MEMATTR_WRITE_THROUGH
* VM_MEMATTR_WRITE_COMBINING

Pointy-hat to:	jhibbits
2017-06-08 02:44:34 +00:00
Justin Hibbits
287e7a861a Add more #ifdef arch checks to the linuxkpi
arm, mips, and powerpc all implement pmap_mapdev_attr() and pmap_unmapdev(),
so add those archs to the checks.  powerpc also includes the atomic_swap_*()
functions, so add that to the supported list as well.  Not tested except by
compiling powerpc.

Reviewed by:	markj
2017-06-07 18:08:11 +00:00
Hans Petter Selasky
8600ba1aa9 Make sure the selrecord() function is only called from within system
polling contexts in the LinuxKPI.

After the kqueue() support was added to the LinuxKPI in r319409 the
Linux poll file operation will be used outside the system file polling
callback function, which can cause a NULL-pointer panic inside
selrecord() because curthread->td_sel is set to NULL. This patch moves
the selrecord() call away from poll_wait() and to the system file poll
callback function in the LinuxKPI, which essentially wraps the Linux
one. This is similar to what the cuse(3) module is currently doing.
Refer to sys/fs/cuse/*.[ch] for more details.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-06-01 16:49:48 +00:00
Hans Petter Selasky
a6b28ee02a Add generic kqueue() and kevent() support to the LinuxKPI character
devices. The implementation allows read and write filters to be
created and piggybacks on the poll() file operation to determine when
a filter should trigger. The piggyback mechanism is simply to check
for the EWOULDBLOCK or EAGAIN return code from read(), write() or
ioctl() system calls and then update the kqueue() polling state bits.
The implementation is similar to the one found in the cuse(3) module.
Refer to sys/fs/cuse/*.[ch] for more details.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-06-01 09:34:51 +00:00
Hans Petter Selasky
c2676069cb Implement print_hex_dump(), print_hex_dump_bytes() and
printk_ratelimited() in the LinuxKPI.

While at it fix the inclusion guard of printk.h to be similar to the
rest of the LinuxKPI header files.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-05-31 16:24:02 +00:00
Hans Petter Selasky
427cefde27 Properly implement idr_preload() and idr_preload_end() in the
LinuxKPI.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-05-31 16:08:30 +00:00
Hans Petter Selasky
dff36e69a1 Implement in_atomic() function in the LinuxKPI.
Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-05-31 15:05:44 +00:00
Hans Petter Selasky
68b9f2f00c Don't acquire a reference on the VM-space when allocating the LinuxKPI
task structure to avoid deadlock when tearing down the VM object
during a process exit.

Found by:		markj @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-05-31 13:01:27 +00:00
Hans Petter Selasky
f5a9867b7d Fixes for refcounting "struct linux_file" in the LinuxKPI.
- Allow "struct linux_file" to be refcounted when its "_file" member
  is NULL by using its "f_count" field. The reference counts are
  transferred to the file structure when the file descriptor is
  installed.

- Add missing vdrop() calls for error cases during open().

- Set the "_file" member of "struct linux_file" during open. This
allows use of refcounting through get_file() and fput() with LinuxKPI
character devices.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-05-31 12:02:59 +00:00
Mark Johnston
cb564d2436 Add some miscellaneous definitions to support DRM drivers.
Reviewed by:	hselasky
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D10985
2017-05-30 17:16:08 +00:00
Mark Johnston
d6c8335623 Add get_cpu() and put_cpu().
MFC after:	1 week
2017-05-21 00:06:36 +00:00
Mark Johnston
c12488bbe0 Add on_each_cpu() and wbinvd_on_all_cpus().
Reviewed by:	hselasky
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D10550
2017-05-01 16:32:28 +00:00
Hans Petter Selasky
a1be2ead3a Use __typeof() instead of typeof() in some RCU related macros in the LinuxKPI.
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-19 13:04:34 +00:00
Hans Petter Selasky
f3de9af633 Fix problem regarding priority inversion when using the concurrency
kit, CK, in the LinuxKPI.

When threads are pinned to a CPU core or when there is only one CPU,
it can happen that a higher priority thread can call the CK
synchronize function while a lower priority thread holds the read
lock. Because the CK's synchronize is a simple wait loop this can lead
to a deadlock situation. To solve this problem use the recently
introduced CK's wait callback function.

When detecting a CK blocking condition figure out the lowest priority
among the blockers and update the calling thread's priority and
yield. If another CPU core is holding the read lock, pin the thread to
the blocked CPU core and update the priority. The calling threads
priority and CPU bindings are restored before return.

If a thread holding a CK read lock is detected to be sleeping, pause()
will be used instead of yield().

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-19 13:03:29 +00:00
Gleb Smirnoff
9ed01c32e0 All these files need sys/vmmeter.h, but now they got it implicitly
included via sys/pcpu.h.
2017-04-17 17:07:00 +00:00
Hans Petter Selasky
76fe8c9330 Fix compilation of LinuxKPI for PowerPC.
Found by:		emaste @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-09 14:31:41 +00:00
Hans Petter Selasky
22cbd6ef2e Create the LinuxKPI current task structure on the fly if it doesn't
exist when the current macro is used.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-07 14:43:28 +00:00
Hans Petter Selasky
99e690772a The __stringify() macro in the LinuxKPI should expand any macros
before stringifying.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-07 12:27:49 +00:00
Hans Petter Selasky
c9dd0b48c9 Cleanup the bitmap_xxx() functions in the LinuxKPI:
- Move all bitmap related functions from bitops.h to bitmap.h, similar
  to what Linux does.

- Apply some minor code cleanup and simplifications to optimize the
  generated code when using static inline functions.

- Implement the following list of bitmap functions which are needed by
  drm-next and ibcore:
  - bitmap_find_next_zero_area_off()
  - bitmap_find_next_zero_area()
  - bitmap_or()
  - bitmap_and()
  - bitmap_xor()

- Add missing include directives to the qlnxe driver
  (davidcs@ has been notified)

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-06 13:30:31 +00:00
Hans Petter Selasky
480e2fd3d5 Define VM_READ, VM_WRITE and VM_EXEC in the LinuxKPI.
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-06 10:52:52 +00:00
Hans Petter Selasky
fc51649e31 Implement need_resched() in the LinuxKPI.
Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-06 10:29:54 +00:00
Hans Petter Selasky
8402f058ad Fix implementation of task_pid_group_leader() in the LinuxKPI.
In FreeBSD thread IDs and procedure IDs have distinct number
spaces. When asking for the group leader task ID in the LinuxKPI,
return the procedure ID and let this resolve to the first task in the
procedure having a valid LinuxKPI task structure pointer.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-06 10:26:03 +00:00
Hans Petter Selasky
1ea4c85781 Implement proper support for memory map operations in the LinuxKPI,
like open, close and fault using the character device pager.

Some notes about the implementation:

1) Linux drivers set the vm_ops and vm_private_data fields during a
mmap() call to indicate that the driver wants to use the LinuxKPI VM
operations. Else these operations are not used.

2) The vm_private_data pointer is associated with a VM area structure
and inserted into an internal LinuxKPI list. If the vm_private_data
pointer already exists, the existing VM area structure is used instead
of the allocated one which gets freed.

3) The LinuxKPI's vm_private_data pointer is used as the callback
handle for the FreeBSD VM object. The VM subsystem in FreeBSD has a
similar list to identify equal handles and will only call the
character device pager's close function once.

4) All LinuxKPI VM operations are serialized through the mmap_sem
sempaphore, which is per procedure, which prevents simultaneous access
to the shared VM area structure when receiving page faults.

Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-06 09:34:54 +00:00
Hans Petter Selasky
0bd68b774d Implement down_write_killable() in the LinuxKPI.
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-04-05 12:10:02 +00:00
Hans Petter Selasky
0a475c59a9 Implement vmalloc_32() in the LinuxKPI.
Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-27 17:18:04 +00:00
Hans Petter Selasky
8186b52744 Implement a series of physical page management related functions in
the LinuxKPI for accessing user-space memory in the kernel.

Add functions to hold and wire physical page(s) based on a given range
of user-space virtual addresses.

Add functions to get and put a reference on, wire, hold, mark
accessed, copy and dirty a physical page.

Add new VM related structures and defines as a preparation step for
advancing the memory map capabilities of the LinuxKPI.

Add function to figure out if a virtual address was allocated using
malloc().

Add function to convert a virtual kernel address into its physical
page pointer.

Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-27 17:04:11 +00:00
Hans Petter Selasky
8f7eee5a63 Use ppsratecheck() for ratelimiting in the LinuxKPI.
Suggested by:		cem @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-23 16:23:55 +00:00
Hans Petter Selasky
d2f312e0e7 Add proper error checking for the string to number conversion
functions in the LinuxKPI.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-23 16:01:51 +00:00
Hans Petter Selasky
8293738e64 Function macros are preferred in the LinuxKPI.
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-23 13:28:16 +00:00
Hans Petter Selasky
e9db3df254 Add support for ratelimited printouts in the LinuxKPI.
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-23 10:48:10 +00:00
Mark Johnston
e5fe3ae2b4 Extend cmpxchg() to support 8- and 16-bit values, and add xchg().
These are needed to support updated revisions of the DRM code.

Reviewed by:	hselasky (previous version)
MFC after:	2 weeks
2017-03-22 17:33:57 +00:00
Hans Petter Selasky
82d0140707 Add full VNET support to the inet_get_local_port_range() function in
the LinuxKPI.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-22 15:46:31 +00:00
Hans Petter Selasky
303bd80ad5 Add support for more IPv4 and IPv6 related macros in the LinuxKPI.
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-22 15:44:00 +00:00
Hans Petter Selasky
a0699ebf77 Implement get_pid_task(), pid_task() and some other PID helper
functions in the LinuxKPI. Add a usage atomic to the task_struct
structure to facilitate refcounting the task structure when returned
from get_pid_task(). The get_task_struct() and put_task_struct()
function is used to manage atomic refcounting. After this change the
task_struct should only be freed through put_task_struct().

Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-17 15:40:24 +00:00
Hans Petter Selasky
05d4f501dc Implement minimalistic memory mapping structure, struct mm_struct, and
some associated helper functions in the LinuxKPI. Let the existing
linux_alloc_current() function allocate and initialize the new
structure and let linux_free_current() drop the refcount on the memory
mapping structure. When the mm_struct's refcount reaches zero, the
structure is freed.

Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-17 10:30:06 +00:00
Hans Petter Selasky
0a2f4606bb Add comment describing the use of pagefault_disable() and
pagefault_enable() in the LinuxKPI.

Suggested by:  		rpokala@
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-17 08:02:46 +00:00
Hans Petter Selasky
810ea5b270 The LinuxKPI pagefault disable and enable functions can only be used
pairwise to support the FreeBSD way of pushing and popping the page
fault flags. Ensure this by requiring every occurrence of pagefault
disable function call to have a corresponding pagefault enable call.

Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-16 16:53:22 +00:00
Hans Petter Selasky
0e05589b39 Implement more userspace memory access functions in the LinuxKPI.
Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-16 16:49:27 +00:00
Hans Petter Selasky
b8a8ed7c96 Define some more LinuxKPI task related macros.
Obtained from:		kmacy @
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-16 12:33:34 +00:00
Hans Petter Selasky
8300fb13dd Add helper function similar to ip_dev_find() to the LinuxKPI to lookup
a network device by its IPv6 address in the given VNET.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-16 10:02:45 +00:00
Hans Petter Selasky
404027276b Add basic support for VIMAGE to the LinuxKPI and ibcore.
Support is implemented by mapping Linux's "struct net" into FreeBSD's
"struct vnet". Currently only vnet0 is supported by ibcore.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-16 09:59:35 +00:00
Hans Petter Selasky
f73286645f Fix implementation of the DECLARE_WORK() macro in the LinuxKPI to fully
initialize the declared work structure and not only the function callback
pointer.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-09 18:37:17 +00:00
Hans Petter Selasky
9760ac0a3e Implement support for mutexes with deadlock avoidance in the LinuxKPI.
When locking a mutex and deadlock is detected the first mutex lock
call that sees the deadlock will return -EDEADLK .

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-09 18:33:40 +00:00
Hans Petter Selasky
4f688d19fb Cleanup the LinuxKPI mutex wrappers.
Add support for using mutexes during KDB and shutdown. This is also
required for doing mode-switching during panic for drm-next.

Add new mutex functions mutex_init_witness() and mutex_destroy()
allowing LinuxKPI mutexes to be tracked by witness.

Declare mutex_is_locked() and mutex_is_owned() like inline functions
to get cleaner warnings. These functions are used inside WARN_ON()
statements which might look a bit odd if these functions get fully
expanded.

Give mutexes better debug names through the mutex_name() macro when
WITNESS_ALL is defined. The mutex_name() macro can prefix parts of the
filename and line number before the mutex name.

MFC after:		1 week
Sponsored by:		Mellanox Technologies
2017-03-09 17:01:00 +00:00