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Char/Misc driver patches for 4.2-rc1
Here's the big char/misc driver pull request for 4.2-rc1. Lots of mei, extcon, coresight, uio, mic, and other driver updates in here. Full details in the shortlog. All of these have been in linux-next for some time with no reported problems. Signed-off-by: Greg Kroah-Hartman <[email protected]> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlWNn0gACgkQMUfUDdst+ykCCQCgvdF4F2+Hy9+RATdk22ak1uq1 JDMAoJTf4oyaIEdaiOKfEIWg9MasS42B =H5wD -----END PGP SIGNATURE----- Merge tag 'char-misc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc driver updates from Greg KH: "Here's the big char/misc driver pull request for 4.2-rc1. Lots of mei, extcon, coresight, uio, mic, and other driver updates in here. Full details in the shortlog. All of these have been in linux-next for some time with no reported problems" * tag 'char-misc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (176 commits) mei: me: wait for power gating exit confirmation mei: reset flow control on the last client disconnection MAINTAINERS: mei: add mei_cl_bus.h to maintained file list misc: sram: sort and clean up included headers misc: sram: move reserved block logic out of probe function misc: sram: add private struct device and virt_base members misc: sram: report correct SRAM pool size misc: sram: bump error message level on unclean driver unbinding misc: sram: fix device node reference leak on error misc: sram: fix enabled clock leak on error path misc: mic: Fix reported static checker warning misc: mic: Fix randconfig build error by including errno.h uio: pruss: Drop depends on ARCH_DAVINCI_DA850 from config uio: pruss: Add CONFIG_HAS_IOMEM dependence uio: pruss: Include <linux/sizes.h> extcon: Redefine the unique id of supported external connectors without 'enum extcon' type char:xilinx_hwicap:buffer_icap - change 1/0 to true/false for bool type variable in function buffer_icap_set_configuration(). Drivers: hv: vmbus: Allocate ring buffer memory in NUMA aware fashion parport: check exclusive access before register w1: use correct lock on error in w1_seq_show() ...
This commit is contained in:
Linus Torvalds
commit
d87823813f
172 changed files with 15485 additions and 5653 deletions
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@ -24,6 +24,10 @@ a virtual bus called mic bus is created and virtual dma devices are
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created on it by the host/card drivers. On host the channels are private
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and used only by the host driver to transfer data for the virtio devices.
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The Symmetric Communication Interface (SCIF (pronounced as skiff)) is a
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low level communications API across PCIe currently implemented for MIC.
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More details are available at scif_overview.txt.
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Here is a block diagram of the various components described above. The
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virtio backends are situated on the host rather than the card given better
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single threaded performance for the host compared to MIC, the ability of
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@ -47,18 +51,18 @@ the fact that the virtio block storage backend can only be on the host.
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| | | Virtio over PCIe IOCTLs |
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| | +--------------------------+
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+-----------+ | | | +-----------+
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| MIC DMA | | | | | MIC DMA |
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| Driver | | | | | Driver |
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+-----------+ | | | +-----------+
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| | | | |
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+---------------+ | | | +----------------+
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|MIC virtual Bus| | | | |MIC virtual Bus |
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+---------------+ | | | +----------------+
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| | | | |
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| +--------------+ | +---------------+ |
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| |Intel MIC | | |Intel MIC | |
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+---|Card Driver | | |Host Driver | |
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+--------------+ | +---------------+-----+
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| MIC DMA | | +----------+ | +-----------+ | | MIC DMA |
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| Driver | | | SCIF | | | SCIF | | | Driver |
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+-----------+ | +----------+ | +-----------+ | +-----------+
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| | | | | | |
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+---------------+ | +-----+-----+ | +-----+-----+ | +---------------+
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|MIC virtual Bus| | |SCIF HW Bus| | |SCIF HW BUS| | |MIC virtual Bus|
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+---------------+ | +-----------+ | +-----+-----+ | +---------------+
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| | | | | | |
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| +--------------+ | | | +---------------+ |
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| |Intel MIC | | | | |Intel MIC | |
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+---|Card Driver +----+ | | |Host Driver | |
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+--------------+ | +----+---------------+-----+
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| | |
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+-------------------------------------------------------------+
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| |
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@ -35,6 +35,7 @@
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exec=/usr/sbin/mpssd
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sysfs="/sys/class/mic"
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mic_modules="mic_host mic_x100_dma scif"
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start()
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{
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@ -48,18 +49,15 @@ start()
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fi
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echo -e $"Starting MPSS Stack"
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echo -e $"Loading MIC_X100_DMA & MIC_HOST Modules"
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echo -e $"Loading MIC drivers:" $mic_modules
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for f in "mic_host" "mic_x100_dma"
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do
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modprobe $f
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RETVAL=$?
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if [ $RETVAL -ne 0 ]; then
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failure
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echo
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return $RETVAL
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fi
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done
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modprobe -a $mic_modules
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RETVAL=$?
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if [ $RETVAL -ne 0 ]; then
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failure
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echo
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return $RETVAL
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fi
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# Start the daemon
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echo -n $"Starting MPSSD "
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@ -170,8 +168,8 @@ unload()
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stop
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sleep 5
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echo -n $"Removing MIC_HOST & MIC_X100_DMA Modules: "
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modprobe -r mic_host mic_x100_dma
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echo -n $"Removing MIC drivers:" $mic_modules
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modprobe -r $mic_modules
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RETVAL=$?
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[ $RETVAL -ne 0 ] && failure || success
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echo
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98
Documentation/mic/scif_overview.txt
Normal file
98
Documentation/mic/scif_overview.txt
Normal file
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@ -0,0 +1,98 @@
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The Symmetric Communication Interface (SCIF (pronounced as skiff)) is a low
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level communications API across PCIe currently implemented for MIC. Currently
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SCIF provides inter-node communication within a single host platform, where a
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node is a MIC Coprocessor or Xeon based host. SCIF abstracts the details of
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communicating over the PCIe bus while providing an API that is symmetric
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across all the nodes in the PCIe network. An important design objective for SCIF
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is to deliver the maximum possible performance given the communication
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abilities of the hardware. SCIF has been used to implement an offload compiler
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runtime and OFED support for MPI implementations for MIC coprocessors.
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==== SCIF API Components ====
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The SCIF API has the following parts:
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1. Connection establishment using a client server model
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2. Byte stream messaging intended for short messages
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3. Node enumeration to determine online nodes
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4. Poll semantics for detection of incoming connections and messages
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5. Memory registration to pin down pages
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6. Remote memory mapping for low latency CPU accesses via mmap
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7. Remote DMA (RDMA) for high bandwidth DMA transfers
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8. Fence APIs for RDMA synchronization
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SCIF exposes the notion of a connection which can be used by peer processes on
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nodes in a SCIF PCIe "network" to share memory "windows" and to communicate. A
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process in a SCIF node initiates a SCIF connection to a peer process on a
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different node via a SCIF "endpoint". SCIF endpoints support messaging APIs
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which are similar to connection oriented socket APIs. Connected SCIF endpoints
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can also register local memory which is followed by data transfer using either
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DMA, CPU copies or remote memory mapping via mmap. SCIF supports both user and
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kernel mode clients which are functionally equivalent.
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==== SCIF Performance for MIC ====
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DMA bandwidth comparison between the TCP (over ethernet over PCIe) stack versus
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SCIF shows the performance advantages of SCIF for HPC applications and runtimes.
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Comparison of TCP and SCIF based BW
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Throughput (GB/sec)
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8 + PCIe Bandwidth ******
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+ TCP ######
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7 + ************************************** SCIF %%%%%%
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| %%%%%%%%%%%%%%%%%%%
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6 + %%%%
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| %%
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| %%%
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5 + %%
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| %%
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4 + %%
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| %%
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3 + %%
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| %
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2 + %%
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| %%
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| %
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1 +
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+ ######################################
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0 +++---+++--+--+-+--+--+-++-+--+-++-+--+-++-+-
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1 10 100 1000 10000 100000
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Transfer Size (KBytes)
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SCIF allows memory sharing via mmap(..) between processes on different PCIe
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nodes and thus provides bare-metal PCIe latency. The round trip SCIF mmap
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latency from the host to an x100 MIC for an 8 byte message is 0.44 usecs.
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SCIF has a user space library which is a thin IOCTL wrapper providing a user
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space API similar to the kernel API in scif.h. The SCIF user space library
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is distributed @ https://software.intel.com/en-us/mic-developer
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Here is some pseudo code for an example of how two applications on two PCIe
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nodes would typically use the SCIF API:
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Process A (on node A) Process B (on node B)
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/* get online node information */
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scif_get_node_ids(..) scif_get_node_ids(..)
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scif_open(..) scif_open(..)
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scif_bind(..) scif_bind(..)
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scif_listen(..)
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scif_accept(..) scif_connect(..)
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/* SCIF connection established */
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/* Send and receive short messages */
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scif_send(..)/scif_recv(..) scif_send(..)/scif_recv(..)
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/* Register memory */
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scif_register(..) scif_register(..)
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/* RDMA */
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scif_readfrom(..)/scif_writeto(..) scif_readfrom(..)/scif_writeto(..)
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/* Fence DMAs */
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scif_fence_signal(..) scif_fence_signal(..)
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mmap(..) mmap(..)
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/* Access remote registered memory */
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/* Close the endpoints */
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scif_close(..) scif_close(..)
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