Since it is a PCIe card, it does not have the ability to host hardware
devices for networking, storage and console. We provide these devices
-on X100 coprocessors thus enabling a self-bootable equivalent environment
-for applications. A key benefit of our solution is that it leverages
-the standard virtio framework for network, disk and console devices,
-though in our case the virtio framework is used across a PCIe bus.
+on X100 coprocessors thus enabling a self-bootable equivalent
+environment for applications. A key benefit of our solution is that it
+leverages the standard virtio framework for network, disk and console
+devices, though in our case the virtio framework is used across a PCIe
+bus. A Virtio Over PCIe (VOP) driver allows creating user space
+backends or devices on the host which are used to probe virtio drivers
+for these devices on the MIC card. The existing VRINGH infrastructure
+in the kernel is used to access virtio rings from the host. The card
+VOP driver allows card virtio drivers to communicate with their user
+space backends on the host via a device page. Ring 3 apps on the host
+can add, remove and configure virtio devices. A thin MIC specific
+virtio_config_ops is implemented which is borrowed heavily from
+previous similar implementations in lguest and s390.
MIC PCIe card has a dma controller with 8 channels. These channels are
shared between the host s/w and the card s/w. 0 to 3 are used by host
the host to initiate DMA's to/from the card using the MIC DMA engine and
the fact that the virtio block storage backend can only be on the host.
- |
+----------+ | +----------+
| Card OS | | | Host OS |
+----------+ | +----------+
| Virtio| |Virtio | |Virtio| | |Virtio | |Virtio | |Virtio |
| Net | |Console | |Block | | |Net | |Console | |Block |
| Driver| |Driver | |Driver| | |backend | |backend | |backend |
- +-------+ +--------+ +------+ | +---------+ +--------+ +--------+
+ +---+---+ +---+----+ +--+---+ | +---------+ +----+---+ +--------+
| | | | | | |
| | | |User | | |
- | | | |------|------------|---------|-------
- +-------------------+ |Kernel +--------------------------+
- | | | Virtio over PCIe IOCTLs |
- | | +--------------------------+
-+-----------+ | | | +-----------+
-| MIC DMA | | +------+ | +------+ +------+ | | MIC DMA |
-| Driver | | | SCIF | | | SCIF | | COSM | | | Driver |
-+-----------+ | +------+ | +------+ +--+---+ | +-----------+
- | | | | | | | |
-+---------------+ | +------+ | +--+---+ +--+---+ | +----------------+
-|MIC virtual Bus| | |SCIF | | |SCIF | | COSM | | |MIC virtual Bus |
-+---------------+ | |HW Bus| | |HW Bus| | Bus | | +----------------+
- | | +------+ | +--+---+ +------+ | |
- | | | | | | | |
- | +-----------+---+ | | | +---------------+ |
- | |Intel MIC | | | | |Intel MIC | |
- +---|Card Driver | | | | |Host Driver | |
- +------------+--------+ | +----+---------------+-----+
+ | | | |------|------------|--+------|-------
+ +---------+---------+ |Kernel |
+ | | |
+ +---------+ +---+----+ +------+ | +------+ +------+ +--+---+ +-------+
+ |MIC DMA | | VOP | | SCIF | | | SCIF | | COSM | | VOP | |MIC DMA|
+ +---+-----+ +---+----+ +--+---+ | +--+---+ +--+---+ +------+ +----+--+
+ | | | | | | |
+ +---+-----+ +---+----+ +--+---+ | +--+---+ +--+---+ +------+ +----+--+
+ |MIC | | VOP | |SCIF | | |SCIF | | COSM | | VOP | | MIC |
+ |HW Bus | | HW Bus| |HW Bus| | |HW Bus| | Bus | |HW Bus| |HW Bus |
+ +---------+ +--------+ +--+---+ | +--+---+ +------+ +------+ +-------+
+ | | | | | | |
+ | +-----------+--+ | | | +---------------+ |
+ | |Intel MIC | | | | |Intel MIC | |
+ | |Card Driver | | | | |Host Driver | |
+ +---+--------------+------+ | +----+---------------+-----+
| | |
+-------------------------------------------------------------+
| |
exec=/usr/sbin/mpssd
sysfs="/sys/class/mic"
-mic_modules="mic_host mic_x100_dma scif"
+mic_modules="mic_host mic_x100_dma scif vop"
start()
{
char path[PATH_MAX];
int fd, err;
- snprintf(path, PATH_MAX, "/dev/mic%d", mic->id);
+ snprintf(path, PATH_MAX, "/dev/vop_virtio%d", mic->id);
fd = open(path, O_RDWR);
if (fd < 0) {
mpsslog("Could not open %s %s\n", path, strerror(errno));
config INTEL_MIC_HOST
tristate "Intel MIC Host Driver"
- depends on 64BIT && PCI && X86 && INTEL_MIC_BUS && SCIF_BUS && MIC_COSM
- select VHOST_RING
+ depends on 64BIT && PCI && X86
+ depends on INTEL_MIC_BUS && SCIF_BUS && MIC_COSM && VOP_BUS
help
This enables Host Driver support for the Intel Many Integrated
Core (MIC) family of PCIe form factor coprocessor devices that
config INTEL_MIC_CARD
tristate "Intel MIC Card Driver"
- depends on 64BIT && X86 && INTEL_MIC_BUS && SCIF_BUS && MIC_COSM
+ depends on 64BIT && X86
+ depends on INTEL_MIC_BUS && SCIF_BUS && MIC_COSM && VOP_BUS
select VIRTIO
help
This enables card driver support for the Intel Many Integrated
.iounmap = ___mic_iounmap,
};
+static inline struct mic_driver *vpdev_to_mdrv(struct vop_device *vpdev)
+{
+ return dev_get_drvdata(vpdev->dev.parent);
+}
+
+static struct mic_irq *
+__mic_request_irq(struct vop_device *vpdev,
+ irqreturn_t (*func)(int irq, void *data),
+ const char *name, void *data, int intr_src)
+{
+ return mic_request_card_irq(func, NULL, name, data, intr_src);
+}
+
+static void __mic_free_irq(struct vop_device *vpdev,
+ struct mic_irq *cookie, void *data)
+{
+ return mic_free_card_irq(cookie, data);
+}
+
+static void __mic_ack_interrupt(struct vop_device *vpdev, int num)
+{
+ struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+ mic_ack_interrupt(&mdrv->mdev);
+}
+
+static int __mic_next_db(struct vop_device *vpdev)
+{
+ return mic_next_card_db();
+}
+
+static void __iomem *__mic_get_remote_dp(struct vop_device *vpdev)
+{
+ struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+ return mdrv->dp;
+}
+
+static void __mic_send_intr(struct vop_device *vpdev, int db)
+{
+ struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+ mic_send_intr(&mdrv->mdev, db);
+}
+
+static void __iomem *__mic_ioremap(struct vop_device *vpdev,
+ dma_addr_t pa, size_t len)
+{
+ struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+ return mic_card_map(&mdrv->mdev, pa, len);
+}
+
+static void __mic_iounmap(struct vop_device *vpdev, void __iomem *va)
+{
+ struct mic_driver *mdrv = vpdev_to_mdrv(vpdev);
+
+ mic_card_unmap(&mdrv->mdev, va);
+}
+
+static struct vop_hw_ops vop_hw_ops = {
+ .request_irq = __mic_request_irq,
+ .free_irq = __mic_free_irq,
+ .ack_interrupt = __mic_ack_interrupt,
+ .next_db = __mic_next_db,
+ .get_remote_dp = __mic_get_remote_dp,
+ .send_intr = __mic_send_intr,
+ .ioremap = __mic_ioremap,
+ .iounmap = __mic_iounmap,
+};
+
static int mic_request_dma_chans(struct mic_driver *mdrv)
{
dma_cap_mask_t mask;
struct dma_chan *chan;
- request_module("mic_x100_dma");
dma_cap_zero(mask);
dma_cap_set(DMA_MEMCPY, mask);
rc = -ENODEV;
goto irq_uninit;
}
+ mdrv->vpdev = vop_register_device(mdrv->dev, VOP_DEV_TRNSP,
+ NULL, &vop_hw_ops, 0,
+ NULL, mdrv->dma_ch[0]);
+ if (IS_ERR(mdrv->vpdev)) {
+ rc = PTR_ERR(mdrv->vpdev);
+ goto dma_free;
+ }
bootparam = mdrv->dp;
node_id = ioread8(&bootparam->node_id);
mdrv->scdev = scif_register_device(mdrv->dev, MIC_SCIF_DEV,
mdrv->num_dma_ch, true);
if (IS_ERR(mdrv->scdev)) {
rc = PTR_ERR(mdrv->scdev);
- goto dma_free;
+ goto vop_remove;
}
mic_create_card_debug_dir(mdrv);
done:
return rc;
+vop_remove:
+ vop_unregister_device(mdrv->vpdev);
dma_free:
mic_free_dma_chans(mdrv);
irq_uninit:
{
mic_delete_card_debug_dir(mdrv);
scif_unregister_device(mdrv->scdev);
+ vop_unregister_device(mdrv->vpdev);
mic_free_dma_chans(mdrv);
mic_uninit_irq();
mic_dp_uninit();
#include <linux/interrupt.h>
#include <linux/mic_bus.h>
#include "../bus/scif_bus.h"
+#include "../bus/vop_bus.h"
/**
* struct mic_intr_info - Contains h/w specific interrupt sources info
* @dma_ch - Array of DMA channels
* @num_dma_ch - Number of DMA channels available
* @scdev: SCIF device on the SCIF virtual bus.
+ * @vpdev: Virtio over PCIe device on the VOP virtual bus.
*/
struct mic_driver {
char name[20];
struct dma_chan *dma_ch[MIC_MAX_DMA_CHAN];
int num_dma_ch;
struct scif_hw_dev *scdev;
+ struct vop_device *vpdev;
};
/**
goto done;
}
+ request_module("mic_x100_dma");
mic_init_card_debugfs();
ret = platform_device_register(&mic_platform_dev);
if (ret) {
#include <linux/mic_common.h>
#include <linux/mic_bus.h>
#include "../bus/scif_bus.h"
+#include "../bus/vop_bus.h"
#include "../common/mic_dev.h"
#include "mic_device.h"
#include "mic_smpt.h"
+static inline struct mic_device *vpdev_to_mdev(struct device *dev)
+{
+ return dev_get_drvdata(dev->parent);
+}
+
+static dma_addr_t
+_mic_dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+ void *va = phys_to_virt(page_to_phys(page)) + offset;
+ struct mic_device *mdev = vpdev_to_mdev(dev);
+
+ return mic_map_single(mdev, va, size);
+}
+
+static void _mic_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
+ size_t size, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct mic_device *mdev = vpdev_to_mdev(dev);
+
+ mic_unmap_single(mdev, dma_addr, size);
+}
+
+static const struct dma_map_ops _mic_dma_ops = {
+ .map_page = _mic_dma_map_page,
+ .unmap_page = _mic_dma_unmap_page,
+};
+
+static struct mic_irq *
+__mic_request_irq(struct vop_device *vpdev,
+ irqreturn_t (*func)(int irq, void *data),
+ const char *name, void *data, int intr_src)
+{
+ struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev);
+
+ return mic_request_threaded_irq(mdev, func, NULL, name, data,
+ intr_src, MIC_INTR_DB);
+}
+
+static void __mic_free_irq(struct vop_device *vpdev,
+ struct mic_irq *cookie, void *data)
+{
+ struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev);
+
+ return mic_free_irq(mdev, cookie, data);
+}
+
+static void __mic_ack_interrupt(struct vop_device *vpdev, int num)
+{
+ struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev);
+
+ mdev->ops->intr_workarounds(mdev);
+}
+
+static int __mic_next_db(struct vop_device *vpdev)
+{
+ struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev);
+
+ return mic_next_db(mdev);
+}
+
+static void *__mic_get_dp(struct vop_device *vpdev)
+{
+ struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev);
+
+ return mdev->dp;
+}
+
+static void __iomem *__mic_get_remote_dp(struct vop_device *vpdev)
+{
+ return NULL;
+}
+
+static void __mic_send_intr(struct vop_device *vpdev, int db)
+{
+ struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev);
+
+ mdev->ops->send_intr(mdev, db);
+}
+
+static void __iomem *__mic_ioremap(struct vop_device *vpdev,
+ dma_addr_t pa, size_t len)
+{
+ struct mic_device *mdev = vpdev_to_mdev(&vpdev->dev);
+
+ return mdev->aper.va + pa;
+}
+
+static void __mic_iounmap(struct vop_device *vpdev, void __iomem *va)
+{
+ /* nothing to do */
+}
+
+static struct vop_hw_ops vop_hw_ops = {
+ .request_irq = __mic_request_irq,
+ .free_irq = __mic_free_irq,
+ .ack_interrupt = __mic_ack_interrupt,
+ .next_db = __mic_next_db,
+ .get_dp = __mic_get_dp,
+ .get_remote_dp = __mic_get_remote_dp,
+ .send_intr = __mic_send_intr,
+ .ioremap = __mic_ioremap,
+ .iounmap = __mic_iounmap,
+};
+
static inline struct mic_device *scdev_to_mdev(struct scif_hw_dev *scdev)
{
return dev_get_drvdata(scdev->dev.parent);
dma_cap_mask_t mask;
struct dma_chan *chan;
- request_module("mic_x100_dma");
dma_cap_zero(mask);
dma_cap_set(DMA_MEMCPY, mask);
goto dma_free;
}
+ mdev->vpdev = vop_register_device(&mdev->pdev->dev,
+ VOP_DEV_TRNSP, &_mic_dma_ops,
+ &vop_hw_ops, id + 1, &mdev->aper,
+ mdev->dma_ch[0]);
+ if (IS_ERR(mdev->vpdev)) {
+ rc = PTR_ERR(mdev->vpdev);
+ goto scif_remove;
+ }
+
rc = mdev->ops->load_mic_fw(mdev, NULL);
if (rc)
- goto scif_remove;
+ goto vop_remove;
mic_smpt_restore(mdev);
mic_intr_restore(mdev);
mdev->intr_ops->enable_interrupts(mdev);
mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
mdev->ops->send_firmware_intr(mdev);
goto unlock_ret;
+vop_remove:
+ vop_unregister_device(mdev->vpdev);
scif_remove:
scif_unregister_device(mdev->scdev);
dma_free:
* will be the first to be registered and the last to be
* unregistered.
*/
+ vop_unregister_device(mdev->vpdev);
scif_unregister_device(mdev->scdev);
mic_free_dma_chans(mdev);
mbus_unregister_device(mdev->dma_mbdev);
#include <linux/miscdevice.h>
#include <linux/mic_bus.h>
#include "../bus/scif_bus.h"
+#include "../bus/vop_bus.h"
#include "../bus/cosm_bus.h"
#include "mic_intr.h"
* @dma_ch - Array of DMA channels
* @num_dma_ch - Number of DMA channels available
* @scdev: SCIF device on the SCIF virtual bus.
+ * @vpdev: Virtio over PCIe device on the VOP virtual bus.
* @cosm_dev: COSM device
*/
struct mic_device {
struct dma_chan *dma_ch[MIC_MAX_DMA_CHAN];
int num_dma_ch;
struct scif_hw_dev *scdev;
+ struct vop_device *vpdev;
struct cosm_device *cosm_dev;
};
{
int ret;
+ request_module("mic_x100_dma");
mic_init_debugfs();
ida_init(&g_mic_ida);
ret = pci_register_driver(&mic_driver);
projects / linux.git / commitdiff