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| author | Ashutosh Dixit | 2013-09-06 01:42:18 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2013-09-26 22:50:56 +0200 |
| commit | f69bcbf3b4c4b333dcd7a48eaf868bf0c88edab5 (patch) | |
| tree | 82edf895c9db652788945faafb8d4301f79cb5f8 /drivers/misc/mic/host/mic_boot.c | |
| parent | Intel MIC Card Driver for X100 family. (diff) | |
| download | kernel-qcow2-linux-f69bcbf3b4c4b333dcd7a48eaf868bf0c88edab5.tar.gz kernel-qcow2-linux-f69bcbf3b4c4b333dcd7a48eaf868bf0c88edab5.tar.xz kernel-qcow2-linux-f69bcbf3b4c4b333dcd7a48eaf868bf0c88edab5.zip | |
Intel MIC Host Driver Changes for Virtio Devices.
This patch introduces the host "Virtio over PCIe" interface for
Intel MIC. It allows creating user space backends on the host and instantiating
virtio devices for them on the Intel MIC card. It uses the existing VRINGH
infrastructure in the kernel to access virtio rings from the host. A character
device per MIC is exposed with IOCTL, mmap and poll callbacks. This allows the
user space backend to:
(a) add/remove a virtio device via a device page.
(b) map (R/O) virtio rings and device page to user space.
(c) poll for availability of data.
(d) copy a descriptor or entire descriptor chain to/from the card.
(e) modify virtio configuration.
(f) handle virtio device reset.
The buffers are copied over using CPU copies for this initial patch
and host initiated MIC DMA support is planned for future patches.
The avail and desc virtio rings are in host memory and the used ring
is in card memory to maximize writes across PCIe for performance.
Co-author: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Caz Yokoyama <Caz.Yokoyama@intel.com>
Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Signed-off-by: Harshavardhan R Kharche <harshavardhan.r.kharche@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Acked-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mic/host/mic_boot.c')
| -rw-r--r-- | drivers/misc/mic/host/mic_boot.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/misc/mic/host/mic_boot.c b/drivers/misc/mic/host/mic_boot.c index 936fc58084f3..fd9ff6d3784e 100644 --- a/drivers/misc/mic/host/mic_boot.c +++ b/drivers/misc/mic/host/mic_boot.c @@ -20,12 +20,12 @@ */ #include <linux/delay.h> #include <linux/firmware.h> -#include <linux/interrupt.h> #include <linux/mic_common.h> #include "../common/mic_device.h" #include "mic_device.h" #include "mic_smpt.h" +#include "mic_virtio.h" /** * mic_reset - Reset the MIC device. @@ -117,6 +117,7 @@ void mic_stop(struct mic_device *mdev, bool force) { mutex_lock(&mdev->mic_mutex); if (MIC_OFFLINE != mdev->state || force) { + mic_virtio_reset_devices(mdev); mic_bootparam_init(mdev); mic_reset(mdev); if (MIC_RESET_FAILED == mdev->state) |