kernel/git/stable/linux.git/drivers/misc/habanalabs/device.c, branch master

habanalabs: create common folder

2020-07-24T17:31:37+00:00

For internal needs of our CI we need to move all the common code into a common folder instead of putting them in the root folder of the driver. Same applies to the common header files under include/ Signed-off-by: Oded Gabbay Reviewed-by: Omer Shpigelman

habanalabs: Assign each CQ with its own work queue

2020-07-24T17:31:37+00:00

We identified a possible race during job completion when working with a single multi-threaded work queue. In order to overcome this race we suggest using a single threaded work queue per completion queue, hence we guarantee jobs completion in order. Signed-off-by: Ofir Bitton Reviewed-by: Oded Gabbay Signed-off-by: Oded Gabbay

habanalabs: halt device CPU only upon certain reset

2020-07-24T17:31:36+00:00

Currently the driver halts the device CPU in the halt engines function, which halts all the engines of the ASIC. The problem is that if later on we stop the reset process (due to inability to clean memory mappings in time), the CPU will remain in halt mode. This creates many issues, such as thermal/power control and FLR handling. Therefore, move the halting of the device CPU to the very end of the reset process, just before writing to the registers to initiate the reset. In addition, the driver now needs to send a message to the device F/W to disable it from sending interrupts to the host machine because during halt engines function the driver disables the MSI/MSI-X interrupts. Signed-off-by: Oded Gabbay Reviewed-by: Tomer Tayar

habanalabs: use queue pi/ci in order to determine queue occupancy

2020-07-24T17:31:36+00:00

Instead of using the free slots amount on the compute CQ to determine whether we can submit work to queues, use the queues pi/ci. This is needed in future ASICs where we don't have CQ per queue. Signed-off-by: Ofir Bitton Reviewed-by: Oded Gabbay Signed-off-by: Oded Gabbay

habanalabs: don't allow hard reset with open processes

2020-05-25T05:15:33+00:00

When the MMU is heavily used by the engines, unmapping might take a lot of time due to a full MMU cache invalidation done as part of the unmap flow. Hence we might not be able to kill all open processes before going to hard reset the device, as it involves unmapping of all user memory. In case of a failure in killing all open processes, we should stop the hard reset flow as it might lead to a kernel crash - one thread (killing of a process) is updating MMU structures that other thread (hard reset) is freeing. Stopping a hard reset flow leaves the device as nonoperational and the user can then initiate a hard reset via sysfs to reinitialize the device. Signed-off-by: Omer Shpigelman Reviewed-by: Oded Gabbay Signed-off-by: Oded Gabbay

habanalabs: GAUDI does not support soft-reset

2020-05-25T05:15:33+00:00

GAUDI does not support soft-reset as it leaves the NIC ports in an awkward state, where their QMANs were reset but the NIC itself is still working. In addition, there is not much sense in doing soft-reset when training is done on multiple GAUDIs. Signed-off-by: Oded Gabbay Reviewed-by: Tomer Tayar

habanalabs: enable gaudi code in driver

2020-05-19T11:48:41+00:00

Enable the GAUDI ASIC code in the pci probe callback of the driver so the driver will handle GAUDI ASICs. Signed-off-by: Oded Gabbay

habanalabs: support clock gating enable/disable

2020-05-19T11:48:41+00:00

In Gaudi there is a feature of clock gating certain engines. Therefore, add this property to the device structure. In addition, due to a limitation of this feature, the driver needs to dynamically enable or disable this feature during run-time. Therefore, add ASIC interface functions to enable/disable this function from the common code. Moreover, this feature must be turned off when the user wishes to debug the ASIC by reading/writing registers and/or memory through the driver's debugfs. Therefore, add an option to enable/disable clock gating via the debugfs interface. Signed-off-by: Oded Gabbay

habanalabs: add dedicated define for hard reset

2020-05-19T11:48:41+00:00

Gaudi requires longer waiting during reset due to closing of network ports. Add this explanation to the relevant comment in the code and add a dedicated define for this reset timeout period, instead of multiplying another define. Signed-off-by: Omer Shpigelman Reviewed-by: Oded Gabbay Signed-off-by: Oded Gabbay

habanalabs: re-factor H/W queues initialization

2020-05-17T09:06:22+00:00

We want to remove the following restrictions/assumptions in our driver: 1. The H/W queue index is also the completion queue index. 2. The H/W queue index is also the IRQ number of the completion queue. 3. All queues of the same type have consecutive indexes. Therefore we add the support for H/W queues of the same type with nonconsecutive indexes and completion queue index and IRQ number different than the H/W queue index. Signed-off-by: Omer Shpigelman Reviewed-by: Oded Gabbay Signed-off-by: Oded Gabbay