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misc: mic: add dma support in host driver 

This patch adds a dma device on the mic virtual bus and uses this dmaengine
to transfer data for virtio devices

Reviewed-by: Nikhil Rao <nikhil.rao@intel.com>
Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Siva Yerramreddy <yshivakrishna@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Siva Yerramreddy 2014-07-11 14:04:23 -07:00 committed by Greg Kroah-Hartman
parent b8e439f48a
commit d4ef098e4c
7 changed files with 283 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/misc/mic/Kconfig
View File

@ -19,7 +19,7 @@ comment "Intel MIC Host Driver"
config INTEL_MIC_HOST
tristate "Intel MIC Host Driver"
depends on 64BIT && PCI && X86
depends on 64BIT && PCI && X86 && INTEL_MIC_BUS
select VHOST_RING
help
This enables Host Driver support for the Intel Many Integrated

83
drivers/misc/mic/host/mic_boot.c
View File

@ -23,11 +23,70 @@
#include <linux/pci.h>
#include <linux/mic_common.h>
#include <linux/mic_bus.h>
#include "../common/mic_dev.h"
#include "mic_device.h"
#include "mic_smpt.h"
#include "mic_virtio.h"
static inline struct mic_device *mbdev_to_mdev(struct mbus_device *mbdev)
{
return dev_get_drvdata(mbdev->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 = dev_get_drvdata(dev->parent);
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 = dev_get_drvdata(dev->parent);
mic_unmap_single(mdev, dma_addr, size);
}
static 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_threaded_irq(struct mbus_device *mbdev,
irq_handler_t handler, irq_handler_t thread_fn,
const char *name, void *data, int intr_src)
{
return mic_request_threaded_irq(mbdev_to_mdev(mbdev), handler,
thread_fn, name, data,
intr_src, MIC_INTR_DMA);
}
static void _mic_free_irq(struct mbus_device *mbdev,
struct mic_irq *cookie, void *data)
{
return mic_free_irq(mbdev_to_mdev(mbdev), cookie, data);
}
static void _mic_ack_interrupt(struct mbus_device *mbdev, int num)
{
struct mic_device *mdev = mbdev_to_mdev(mbdev);
mdev->ops->intr_workarounds(mdev);
}
static struct mbus_hw_ops mbus_hw_ops = {
.request_threaded_irq = _mic_request_threaded_irq,
.free_irq = _mic_free_irq,
.ack_interrupt = _mic_ack_interrupt,
};
/**
* mic_reset - Reset the MIC device.
* @mdev: pointer to mic_device instance
@ -95,9 +154,21 @@ retry:
*/
goto retry;
}
mdev->dma_mbdev = mbus_register_device(mdev->sdev->parent,
MBUS_DEV_DMA_HOST, &mic_dma_ops,
&mbus_hw_ops, mdev->mmio.va);
if (IS_ERR(mdev->dma_mbdev)) {
rc = PTR_ERR(mdev->dma_mbdev);
goto unlock_ret;
}
mdev->dma_ch = mic_request_dma_chan(mdev);
if (!mdev->dma_ch) {
rc = -ENXIO;
goto dma_remove;
}
rc = mdev->ops->load_mic_fw(mdev, buf);
if (rc)
goto unlock_ret;
goto dma_release;
mic_smpt_restore(mdev);
mic_intr_restore(mdev);
mdev->intr_ops->enable_interrupts(mdev);
@ -105,6 +176,11 @@ retry:
mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
mdev->ops->send_firmware_intr(mdev);
mic_set_state(mdev, MIC_ONLINE);
goto unlock_ret;
dma_release:
dma_release_channel(mdev->dma_ch);
dma_remove:
mbus_unregister_device(mdev->dma_mbdev);
unlock_ret:
mutex_unlock(&mdev->mic_mutex);
return rc;
@ -122,6 +198,11 @@ 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);
if (mdev->dma_ch) {
dma_release_channel(mdev->dma_ch);
mdev->dma_ch = NULL;
}
mbus_unregister_device(mdev->dma_mbdev);
mic_bootparam_init(mdev);
mic_reset(mdev);
if (MIC_RESET_FAILED == mdev->state)

24
drivers/misc/mic/host/mic_device.h
View File

@ -25,6 +25,8 @@
#include <linux/idr.h>
#include <linux/notifier.h>
#include <linux/irqreturn.h>
#include <linux/dmaengine.h>
#include <linux/mic_bus.h>
#include "mic_intr.h"
@ -87,6 +89,8 @@ enum mic_stepping {
* @cdev: Character device for MIC.
* @vdev_list: list of virtio devices.
* @pm_notifier: Handles PM notifications from the OS.
* @dma_mbdev: MIC BUS DMA device.
* @dma_ch: DMA channel reserved by this driver for use by virtio devices.
*/
struct mic_device {
struct mic_mw mmio;
@ -124,6 +128,8 @@ struct mic_device {
struct cdev cdev;
struct list_head vdev_list;
struct notifier_block pm_notifier;
struct mbus_device *dma_mbdev;
struct dma_chan *dma_ch;
};
/**
@ -144,6 +150,7 @@ struct mic_device {
* @load_mic_fw: Load firmware segments required to boot the card
* into card memory. This includes the kernel, command line, ramdisk etc.
* @get_postcode: Get post code status from firmware.
* @dma_filter: DMA filter function to be used.
*/
struct mic_hw_ops {
u8 aper_bar;
@ -159,6 +166,7 @@ struct mic_hw_ops {
void (*send_firmware_intr)(struct mic_device *mdev);
int (*load_mic_fw)(struct mic_device *mdev, const char *buf);
u32 (*get_postcode)(struct mic_device *mdev);
bool (*dma_filter)(struct dma_chan *chan, void *param);
};
/**
@ -187,6 +195,22 @@ mic_mmio_write(struct mic_mw *mw, u32 val, u32 offset)
iowrite32(val, mw->va + offset);
}
static inline struct dma_chan *mic_request_dma_chan(struct mic_device *mdev)
{
dma_cap_mask_t mask;
struct dma_chan *chan;
dma_cap_zero(mask);
dma_cap_set(DMA_MEMCPY, mask);
chan = dma_request_channel(mask, mdev->ops->dma_filter,
mdev->sdev->parent);
if (chan)
return chan;
dev_err(mdev->sdev->parent, "%s %d unable to acquire channel\n",
__func__, __LINE__);
return NULL;
}
void mic_sysfs_init(struct mic_device *mdev);
int mic_start(struct mic_device *mdev, const char *buf);
void mic_stop(struct mic_device *mdev, bool force);

3
drivers/misc/mic/host/mic_intr.h
View File

@ -27,8 +27,9 @@
* The minimum number of msix vectors required for normal operation.
* 3 for virtio network, console and block devices.
* 1 for card shutdown notifications.
* 4 for host owned DMA channels.
*/
#define MIC_MIN_MSIX 4
#define MIC_MIN_MSIX 8
#define MIC_NUM_OFFSETS 32
/**

185
drivers/misc/mic/host/mic_virtio.c
View File

@ -21,60 +21,157 @@
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <linux/dmaengine.h>
#include <linux/mic_common.h>
#include "../common/mic_dev.h"
#include "mic_device.h"
#include "mic_smpt.h"
#include "mic_virtio.h"
/*
* Initiates the copies across the PCIe bus from card memory to
* a user space buffer.
* Size of the internal buffer used during DMA's as an intermediate buffer
* for copy to/from user.
*/
static int mic_virtio_copy_to_user(struct mic_vdev *mvdev,
void __user *ubuf, size_t len, u64 addr)
#define MIC_INT_DMA_BUF_SIZE PAGE_ALIGN(64 * 1024ULL)
static int mic_sync_dma(struct mic_device *mdev, dma_addr_t dst,
dma_addr_t src, size_t len)
{
int err;
void __iomem *dbuf = mvdev->mdev->aper.va + addr;
/*
* We are copying from IO below an should ideally use something
* like copy_to_user_fromio(..) if it existed.
*/
if (copy_to_user(ubuf, (void __force *)dbuf, len)) {
err = -EFAULT;
dev_err(mic_dev(mvdev), "%s %d err %d\n",
__func__, __LINE__, err);
goto err;
int err = 0;
struct dma_async_tx_descriptor *tx;
struct dma_chan *mic_ch = mdev->dma_ch;
if (!mic_ch) {
err = -EBUSY;
goto error;
}
mvdev->in_bytes += len;
err = 0;
err:
tx = mic_ch->device->device_prep_dma_memcpy(mic_ch, dst, src, len,
DMA_PREP_FENCE);
if (!tx) {
err = -ENOMEM;
goto error;
} else {
dma_cookie_t cookie = tx->tx_submit(tx);
err = dma_submit_error(cookie);
if (err)
goto error;
err = dma_sync_wait(mic_ch, cookie);
}
error:
if (err)
dev_err(mdev->sdev->parent, "%s %d err %d\n",
__func__, __LINE__, err);
return err;
}
/*
* Initiates copies across the PCIe bus from a user space
* buffer to card memory.
* Initiates the copies across the PCIe bus from card memory to a user
* space buffer. When transfers are done using DMA, source/destination
* addresses and transfer length must follow the alignment requirements of
* the MIC DMA engine.
*/
static int mic_virtio_copy_from_user(struct mic_vdev *mvdev,
void __user *ubuf, size_t len, u64 addr)
static int mic_virtio_copy_to_user(struct mic_vdev *mvdev, void __user *ubuf,
size_t len, u64 daddr, size_t dlen,
int vr_idx)
{
struct mic_device *mdev = mvdev->mdev;
void __iomem *dbuf = mdev->aper.va + daddr;
struct mic_vringh *mvr = &mvdev->mvr[vr_idx];
size_t dma_alignment = 1 << mdev->dma_ch->device->copy_align;
size_t dma_offset;
size_t partlen;
int err;
void __iomem *dbuf = mvdev->mdev->aper.va + addr;
dma_offset = daddr - round_down(daddr, dma_alignment);
daddr -= dma_offset;
len += dma_offset;
while (len) {
partlen = min_t(size_t, len, MIC_INT_DMA_BUF_SIZE);
err = mic_sync_dma(mdev, mvr->buf_da, daddr,
ALIGN(partlen, dma_alignment));
if (err)
goto err;
if (copy_to_user(ubuf, mvr->buf + dma_offset,
partlen - dma_offset)) {
err = -EFAULT;
goto err;
}
daddr += partlen;
ubuf += partlen;
dbuf += partlen;
mvdev->in_bytes_dma += partlen;
mvdev->in_bytes += partlen;
len -= partlen;
dma_offset = 0;
}
return 0;
err:
dev_err(mic_dev(mvdev), "%s %d err %d\n", __func__, __LINE__, err);
return err;
}
/*
* Initiates copies across the PCIe bus from a user space buffer to card
* memory. When transfers are done using DMA, source/destination addresses
* and transfer length must follow the alignment requirements of the MIC
* DMA engine.
*/
static int mic_virtio_copy_from_user(struct mic_vdev *mvdev, void __user *ubuf,
size_t len, u64 daddr, size_t dlen,
int vr_idx)
{
struct mic_device *mdev = mvdev->mdev;
void __iomem *dbuf = mdev->aper.va + daddr;
struct mic_vringh *mvr = &mvdev->mvr[vr_idx];
size_t dma_alignment = 1 << mdev->dma_ch->device->copy_align;
size_t partlen;
int err;
if (daddr & (dma_alignment - 1)) {
mvdev->tx_dst_unaligned += len;
goto memcpy;
} else if (ALIGN(len, dma_alignment) > dlen) {
mvdev->tx_len_unaligned += len;
goto memcpy;
}
while (len) {
partlen = min_t(size_t, len, MIC_INT_DMA_BUF_SIZE);
if (copy_from_user(mvr->buf, ubuf, partlen)) {
err = -EFAULT;
goto err;
}
err = mic_sync_dma(mdev, daddr, mvr->buf_da,
ALIGN(partlen, dma_alignment));
if (err)
goto err;
daddr += partlen;
ubuf += partlen;
dbuf += partlen;
mvdev->out_bytes_dma += partlen;
mvdev->out_bytes += partlen;
len -= partlen;
}
memcpy:
/*
* We are copying to IO below and should ideally use something
* like copy_from_user_toio(..) if it existed.
*/
if (copy_from_user((void __force *)dbuf, ubuf, len)) {
err = -EFAULT;
dev_err(mic_dev(mvdev), "%s %d err %d\n",
__func__, __LINE__, err);
goto err;
}
mvdev->out_bytes += len;
err = 0;
return 0;
err:
dev_err(mic_dev(mvdev), "%s %d err %d\n", __func__, __LINE__, err);
return err;
}
@ -110,7 +207,8 @@ static inline u32 mic_vringh_iov_consumed(struct vringh_kiov *iov)
* way to override the VRINGH xfer(..) routines as of v3.10.
*/
static int mic_vringh_copy(struct mic_vdev *mvdev, struct vringh_kiov *iov,
void __user *ubuf, size_t len, bool read, size_t *out_len)
void __user *ubuf, size_t len, bool read, int vr_idx,
size_t *out_len)
{
int ret = 0;
size_t partlen, tot_len = 0;
@ -118,13 +216,15 @@ static int mic_vringh_copy(struct mic_vdev *mvdev, struct vringh_kiov *iov,
while (len && iov->i < iov->used) {
partlen = min(iov->iov[iov->i].iov_len, len);
if (read)
ret = mic_virtio_copy_to_user(mvdev,
ubuf, partlen,
(u64)iov->iov[iov->i].iov_base);
ret = mic_virtio_copy_to_user(mvdev, ubuf, partlen,
(u64)iov->iov[iov->i].iov_base,
iov->iov[iov->i].iov_len,
vr_idx);
else
ret = mic_virtio_copy_from_user(mvdev,
ubuf, partlen,
(u64)iov->iov[iov->i].iov_base);
ret = mic_virtio_copy_from_user(mvdev, ubuf, partlen,
(u64)iov->iov[iov->i].iov_base,
iov->iov[iov->i].iov_len,
vr_idx);
if (ret) {
dev_err(mic_dev(mvdev), "%s %d err %d\n",
__func__, __LINE__, ret);
@ -192,8 +292,8 @@ static int _mic_virtio_copy(struct mic_vdev *mvdev,
ubuf = iov.iov_base;
}
/* Issue all the read descriptors first */
ret = mic_vringh_copy(mvdev, riov, ubuf, len,
MIC_VRINGH_READ, &out_len);
ret = mic_vringh_copy(mvdev, riov, ubuf, len, MIC_VRINGH_READ,
copy->vr_idx, &out_len);
if (ret) {
dev_err(mic_dev(mvdev), "%s %d err %d\n",
__func__, __LINE__, ret);
@ -203,8 +303,8 @@ static int _mic_virtio_copy(struct mic_vdev *mvdev,
ubuf += out_len;
copy->out_len += out_len;
/* Issue the write descriptors next */
ret = mic_vringh_copy(mvdev, wiov, ubuf, len,
!MIC_VRINGH_READ, &out_len);
ret = mic_vringh_copy(mvdev, wiov, ubuf, len, !MIC_VRINGH_READ,
copy->vr_idx, &out_len);
if (ret) {
dev_err(mic_dev(mvdev), "%s %d err %d\n",
__func__, __LINE__, ret);
@ -589,6 +689,10 @@ int mic_virtio_add_device(struct mic_vdev *mvdev,
dev_dbg(mdev->sdev->parent,
"%s %d index %d va %p info %p vr_size 0x%x\n",
__func__, __LINE__, i, vr->va, vr->info, vr_size);
mvr->buf = (void *)__get_free_pages(GFP_KERNEL,
get_order(MIC_INT_DMA_BUF_SIZE));
mvr->buf_da = mic_map_single(mvdev->mdev, mvr->buf,
MIC_INT_DMA_BUF_SIZE);
}
snprintf(irqname, sizeof(irqname), "mic%dvirtio%d", mdev->id,
@ -673,6 +777,11 @@ skip_hot_remove:
vqconfig = mic_vq_config(mvdev->dd);
for (i = 0; i < mvdev->dd->num_vq; i++) {
struct mic_vringh *mvr = &mvdev->mvr[i];
mic_unmap_single(mvdev->mdev, mvr->buf_da,
MIC_INT_DMA_BUF_SIZE);
free_pages((unsigned long)mvr->buf,
get_order(MIC_INT_DMA_BUF_SIZE));
vringh_kiov_cleanup(&mvr->riov);
vringh_kiov_cleanup(&mvr->wiov);
mic_unmap_single(mdev, le64_to_cpu(vqconfig[i].address),

21
drivers/misc/mic/host/mic_virtio.h
View File

@ -46,18 +46,23 @@
* @vrh: The host VRINGH used for accessing the card vrings.
* @riov: The VRINGH read kernel IOV.
* @wiov: The VRINGH write kernel IOV.
* @head: The VRINGH head index address passed to vringh_getdesc_kern(..).
* @vr_mutex: Mutex for synchronizing access to the VRING.
* @buf: Temporary kernel buffer used to copy in/out data
* from/to the card via DMA.
* @buf_da: dma address of buf.
* @mvdev: Back pointer to MIC virtio device for vringh_notify(..).
* @head: The VRINGH head index address passed to vringh_getdesc_kern(..).
*/
struct mic_vringh {
struct mic_vring vring;
struct vringh vrh;
struct vringh_kiov riov;
struct vringh_kiov wiov;
u16 head;
struct mutex vr_mutex;
void *buf;
dma_addr_t buf_da;
struct mic_vdev *mvdev;
u16 head;
};
/**
@ -69,6 +74,14 @@ struct mic_vringh {
* @poll_wake - Used for waking up threads blocked in poll.
* @out_bytes - Debug stats for number of bytes copied from host to card.
* @in_bytes - Debug stats for number of bytes copied from card to host.
* @out_bytes_dma - Debug stats for number of bytes copied from host to card
* using DMA.
* @in_bytes_dma - Debug stats for number of bytes copied from card to host
* using DMA.
* @tx_len_unaligned - Debug stats for number of bytes copied to the card where
* the transfer length did not have the required DMA alignment.
* @tx_dst_unaligned - Debug stats for number of bytes copied where the
* destination address on the card did not have the required DMA alignment.
* @mvr - Store per VRING data structures.
* @virtio_bh_work - Work struct used to schedule virtio bottom half handling.
* @dd - Virtio device descriptor.
@ -84,6 +97,10 @@ struct mic_vdev {
int poll_wake;
unsigned long out_bytes;
unsigned long in_bytes;
unsigned long out_bytes_dma;
unsigned long in_bytes_dma;
unsigned long tx_len_unaligned;
unsigned long tx_dst_unaligned;
struct mic_vringh mvr[MIC_MAX_VRINGS];
struct work_struct virtio_bh_work;
struct mic_device_desc *dd;

8
drivers/misc/mic/host/mic_x100.c
View File

@ -549,6 +549,13 @@ struct mic_smpt_ops mic_x100_smpt_ops = {
.set = mic_x100_smpt_set,
};
static bool mic_x100_dma_filter(struct dma_chan *chan, void *param)
{
if (chan->device->dev->parent == (struct device *)param)
return true;
return false;
}
struct mic_hw_ops mic_x100_ops = {
.aper_bar = MIC_X100_APER_BAR,
.mmio_bar = MIC_X100_MMIO_BAR,
@ -563,6 +570,7 @@ struct mic_hw_ops mic_x100_ops = {
.send_firmware_intr = mic_x100_send_firmware_intr,
.load_mic_fw = mic_x100_load_firmware,
.get_postcode = mic_x100_get_postcode,
.dma_filter = mic_x100_dma_filter,
};
struct mic_hw_intr_ops mic_x100_intr_ops = {