Addresses regressions from the reverted merge
of the tbx fault manager for host memory.
Recursive locking of mutex caused deadlock.
To fix, separate tbx fault data from base
cpu fault data, allowing separate mutexes
for each, eliminating recursive locks on
the same mutex.
By separating, we also help ensure that tbx-related
changes don't affect the original cpu fault manager code
paths.
As an added safe guard preventing critical regressions
and avoiding another auto-revert, the tbx fault manager
is hidden behind a new debug flag which is disabled by default.
Related-To: NEO-12268
Signed-off-by: Jack Myers <jack.myers@intel.com>
Addresses regressions from the reverted merge
of the tbx fault manager for host memory.
This fixes attempts by the tbx fault manager
to protect/unprotect host buffer memory, even
if the host ptr was not driver-allocated.
In the case of the smoke test that triggered
the critical regression, clCreateBuffer was
called with the CL_MEM_USE_HOST_PTR flag.
The subsequent `mprotect` calls on the
provided host ptr then failed.
Related-To: NEO-12268
Signed-off-by: Jack Myers <jack.myers@intel.com>
In TBX mode, the host could not write to host buffers after access from device
code due to the lack of a migration mechanism post-initial TBX upload.
Migration is unnecessary with real hardware, but required for TBX.
This patch introduces a new page fault manager type that extends the original
CPU fault manager, enabling automatic migration of host buffers in TBX mode.
Refactoring was necessary to avoid diamond inheritance, achieved by using a
template parameter as the base class for OS-specific fault managers.
Related-To: NEO-12268
Signed-off-by: Jack Myers <jack.myers@intel.com>
Recorded multiple page fault handlers by using vector in
cpu_page_fault_manager_linux.
Added a static handlerIndex in order to track the depth of
handler logic to call appropriate previous handlers.
Related-To: NEO-11563
Signed-off-by: Young Jin Yoon <young.jin.yoon@intel.com>
Recorded multiple page fault handlers by using vector in
cpu_page_fault_manager_linux.
Added a static handlerIndex in order to track the depth of
handler logic to call appropriate previous handlers.
Related-To: NEO-11563
Signed-off-by: Young Jin Yoon <young.jin.yoon@intel.com>
Recorded multiple page fault handlers by using vector in
cpu_page_fault_manager_linux.
Added a static handlerIndex in order to track the depth of
handler logic to call appropriate previous handlers.
Related-To: NEO-11563
Signed-off-by: Young Jin Yoon <young.jin.yoon@intel.com>
Created registerFaultHandler() and checkFaultHandlerFromPageFaultManager()
and removed registering sigaction() from the contructor of the
PageFaultManagerLinux class.
Added if statment to check the current pagefault handler is from the
pagefault manager. If not, register the pagefault handler of the current
pagefault manager on linux.
Refactored windows exception vector adding logic to
registerFaultHandler() and call upon the constructor of the
PageFaultManagerWindows, and make
checkFaultHandlerFromPageFaultManager() always return true for windows.
Related-To: NEO-8190
Signed-off-by: Young Jin Yoon <young.jin.yoon@intel.com>
Enable eviction of CPU side USM allocation for UMD migrations on Windows.
Reverts incorrect auto-revert commit 218de586a4f28b1de3e983b9006e7a99d3a4d10e.
Related-To: NEO-8015
Signed-off-by: Milczarek, Slawomir <slawomir.milczarek@intel.com>
Enable eviction of CPU side USM allocation for UMD migrations on Windows.
Related-To: NEO-8015
Signed-off-by: Milczarek, Slawomir <slawomir.milczarek@intel.com>
Enable eviction of CPU side USM allocation for UMD migrations on Windows.
Related-To: NEO-8015
Signed-off-by: Milczarek, Slawomir <slawomir.milczarek@intel.com>
Jack Myers