linux-kernel - [PATCH v2 0/7] habanalabs: support info queries by multiple processes

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Message-Id: <20190730094724.18691-1-oded.gabbay@gmail.com>
Date:   Tue, 30 Jul 2019 12:47:17 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org, oshpigelman@...ana.ai,
        ttayar@...ana.ai, gregkh@...uxfoundation.org
Subject: [PATCH v2 0/7] habanalabs: support info queries by multiple processes

Today, the driver allows only a single user application (the deep-learning
application) to perform queries of the device's stats, information, idle
state and more.

This is a serious limitation in data centers, where there are
multiple system/monitorining applications that want to continuously
retrieve that information, while allowing the deep-learning application to
perform work on the device.

This patch-set allows unlimited number of user applications to perform
the above queries (by calling the INFO IOCTL), while the deep-learning
application is running.

This is done by creating an additional char device per ASIC, that is
dedicated to information retrieval only (allows only to call the INFO
IOCTL). This method will maintain backward compatibility with existing
userspace applications.

- Patches 1-4 makes small improvements to existing code.
- Patch 5 removes the accounting of the number of open file-descriptors
  and replace it with tracking of the driver's internal file private data
  strcuture.
- Patch 6 is a pre-requisite to creating the two char devices
- Patch 7 introduce the additional char device

Thanks,
Oded

Oded Gabbay (7):
  habanalabs: add handle field to context structure
  habanalabs: kill user process after CS rollback
  habanalabs: show the process context dram usage
  habanalabs: rename user_ctx as compute_ctx
  habanalabs: maintain a list of file private data objects
  habanalabs: change device_setup_cdev() to be more generic
  habanalabs: create two char devices per ASIC

 drivers/misc/habanalabs/context.c          |  38 +--
 drivers/misc/habanalabs/debugfs.c          |   4 +-
 drivers/misc/habanalabs/device.c           | 256 ++++++++++++---------
 drivers/misc/habanalabs/goya/goya_hwmgr.c  |  11 +-
 drivers/misc/habanalabs/habanalabs.h       |  53 +++--
 drivers/misc/habanalabs/habanalabs_drv.c   | 125 ++++++----
 drivers/misc/habanalabs/habanalabs_ioctl.c | 104 ++++++---
 7 files changed, 374 insertions(+), 217 deletions(-)

-- 
2.17.1