diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mic/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_boot.c | 83 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_device.h | 24 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_intr.h | 3 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_virtio.c | 181 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_virtio.h | 21 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_x100.c | 8 |
7 files changed, 281 insertions, 41 deletions
diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig index ee1d2ac3cd09..bf76313dab16 100644 --- a/drivers/misc/mic/Kconfig +++ b/drivers/misc/mic/Kconfig @@ -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 diff --git a/drivers/misc/mic/host/mic_boot.c b/drivers/misc/mic/host/mic_boot.c index b75c6b5cc20f..ff2b0fb1a6be 100644 --- a/drivers/misc/mic/host/mic_boot.c +++ b/drivers/misc/mic/host/mic_boot.c @@ -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) diff --git a/drivers/misc/mic/host/mic_device.h b/drivers/misc/mic/host/mic_device.h index 0398c696d257..016bd15a7bd1 100644 --- a/drivers/misc/mic/host/mic_device.h +++ b/drivers/misc/mic/host/mic_device.h @@ -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); diff --git a/drivers/misc/mic/host/mic_intr.h b/drivers/misc/mic/host/mic_intr.h index b1334dd9a0a1..9f783d4ad7f1 100644 --- a/drivers/misc/mic/host/mic_intr.h +++ b/drivers/misc/mic/host/mic_intr.h @@ -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 /** diff --git a/drivers/misc/mic/host/mic_virtio.c b/drivers/misc/mic/host/mic_virtio.c index aba3e8324b82..a020e4eb435a 100644 --- a/drivers/misc/mic/host/mic_virtio.c +++ b/drivers/misc/mic/host/mic_virtio.c @@ -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", + int err = 0; + struct dma_async_tx_descriptor *tx; + struct dma_chan *mic_ch = mdev->dma_ch; + + if (!mic_ch) { + err = -EBUSY; + goto error; + } + + 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); - goto err; + return err; +} + +/* + * 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_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; + + 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; } - mvdev->in_bytes += len; - err = 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. + * 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 addr) +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; - void __iomem *dbuf = mvdev->mdev->aper.va + addr; + + 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), diff --git a/drivers/misc/mic/host/mic_virtio.h b/drivers/misc/mic/host/mic_virtio.h index 184f3c84805b..d574efb853d9 100644 --- a/drivers/misc/mic/host/mic_virtio.h +++ b/drivers/misc/mic/host/mic_virtio.h @@ -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; diff --git a/drivers/misc/mic/host/mic_x100.c b/drivers/misc/mic/host/mic_x100.c index 5562fdd3ef4e..b7a21e11dcdf 100644 --- a/drivers/misc/mic/host/mic_x100.c +++ b/drivers/misc/mic/host/mic_x100.c @@ -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 = { |