diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mic/host/Makefile | 2 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_device.h | 21 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_intr.c | 628 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_intr.h | 137 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_main.c | 26 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_smpt.c | 442 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_smpt.h | 98 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_x100.c | 247 | ||||
| -rw-r--r-- | drivers/misc/mic/host/mic_x100.h | 39 |
9 files changed, 1638 insertions, 2 deletions
diff --git a/drivers/misc/mic/host/Makefile b/drivers/misc/mic/host/Makefile index 93b9d25..6ff5550 100644 --- a/drivers/misc/mic/host/Makefile +++ b/drivers/misc/mic/host/Makefile @@ -6,3 +6,5 @@ obj-$(CONFIG_INTEL_MIC_HOST) += mic_host.o mic_host-objs := mic_main.o mic_host-objs += mic_x100.o mic_host-objs += mic_sysfs.o +mic_host-objs += mic_smpt.o +mic_host-objs += mic_intr.o diff --git a/drivers/misc/mic/host/mic_device.h b/drivers/misc/mic/host/mic_device.h index 6cd904c..dd34b65 100644 --- a/drivers/misc/mic/host/mic_device.h +++ b/drivers/misc/mic/host/mic_device.h @@ -21,6 +21,10 @@ #ifndef _MIC_DEVICE_H_ #define _MIC_DEVICE_H_ +#include <linux/idr.h> + +#include "mic_intr.h" + /* The maximum number of MIC devices supported in a single host system. */ #define MIC_MAX_NUM_DEVS 256 @@ -53,6 +57,12 @@ enum mic_stepping { * @stepping: Stepping ID. * @attr_group: Pointer to list of sysfs attribute groups. * @sdev: Device for sysfs entries. + * @mic_mutex: Mutex for synchronizing access to mic_device. + * @intr_ops: HW specific interrupt operations. + * @smpt_ops: Hardware specific SMPT operations. + * @smpt: MIC SMPT information. + * @intr_info: H/W specific interrupt information. + * @irq_info: The OS specific irq information */ struct mic_device { struct mic_mw mmio; @@ -63,6 +73,12 @@ struct mic_device { enum mic_stepping stepping; const struct attribute_group **attr_group; struct device *sdev; + struct mutex mic_mutex; + struct mic_hw_intr_ops *intr_ops; + struct mic_smpt_ops *smpt_ops; + struct mic_smpt_info *smpt; + struct mic_intr_info *intr_info; + struct mic_irq_info irq_info; }; /** @@ -71,12 +87,17 @@ struct mic_device { * @mmio_bar: MMIO bar resource number. * @read_spad: Read from scratch pad register. * @write_spad: Write to scratch pad register. + * @send_intr: Send an interrupt for a particular doorbell on the card. + * @ack_interrupt: Hardware specific operations to ack the h/w on + * receipt of an interrupt. */ struct mic_hw_ops { u8 aper_bar; u8 mmio_bar; u32 (*read_spad)(struct mic_device *mdev, unsigned int idx); void (*write_spad)(struct mic_device *mdev, unsigned int idx, u32 val); + void (*send_intr)(struct mic_device *mdev, int doorbell); + u32 (*ack_interrupt)(struct mic_device *mdev); }; /** diff --git a/drivers/misc/mic/host/mic_intr.c b/drivers/misc/mic/host/mic_intr.c new file mode 100644 index 0000000..cdae314 --- /dev/null +++ b/drivers/misc/mic/host/mic_intr.c @@ -0,0 +1,628 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2013 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC Host driver. + * + */ +#include <linux/pci.h> +#include <linux/interrupt.h> + +#include "../common/mic_device.h" +#include "mic_device.h" + +/* + * mic_invoke_callback - Invoke callback functions registered for + * the corresponding source id. + * + * @mdev: pointer to the mic_device instance + * @idx: The interrupt source id. + * + * Returns none. + */ +static inline void mic_invoke_callback(struct mic_device *mdev, int idx) +{ + struct mic_intr_cb *intr_cb; + struct pci_dev *pdev = container_of(mdev->sdev->parent, + struct pci_dev, dev); + + spin_lock(&mdev->irq_info.mic_intr_lock); + list_for_each_entry(intr_cb, &mdev->irq_info.cb_list[idx], list) + if (intr_cb->func) + intr_cb->func(pdev->irq, intr_cb->data); + spin_unlock(&mdev->irq_info.mic_intr_lock); +} + +/** + * mic_interrupt - Generic interrupt handler for + * MSI and INTx based interrupts. + */ +static irqreturn_t mic_interrupt(int irq, void *dev) +{ + struct mic_device *mdev = dev; + struct mic_intr_info *info = mdev->intr_info; + u32 mask; + int i; + + mask = mdev->ops->ack_interrupt(mdev); + if (!mask) + return IRQ_NONE; + + for (i = info->intr_start_idx[MIC_INTR_DB]; + i < info->intr_len[MIC_INTR_DB]; i++) + if (mask & BIT(i)) + mic_invoke_callback(mdev, i); + + return IRQ_HANDLED; +} + +/* Return the interrupt offset from the index. Index is 0 based. */ +static u16 mic_map_src_to_offset(struct mic_device *mdev, + int intr_src, enum mic_intr_type type) { + + if (type >= MIC_NUM_INTR_TYPES) + return MIC_NUM_OFFSETS; + if (intr_src >= mdev->intr_info->intr_len[type]) + return MIC_NUM_OFFSETS; + + return mdev->intr_info->intr_start_idx[type] + intr_src; +} + +/* Return next available msix_entry. */ +static struct msix_entry *mic_get_available_vector(struct mic_device *mdev) +{ + int i; + struct mic_irq_info *info = &mdev->irq_info; + + for (i = 0; i < info->num_vectors; i++) + if (!info->mic_msi_map[i]) + return &info->msix_entries[i]; + return NULL; +} + +/** + * mic_register_intr_callback - Register a callback handler for the + * given source id. + * + * @mdev: pointer to the mic_device instance + * @idx: The source id to be registered. + * @func: The function to be called when the source id receives + * the interrupt. + * @data: Private data of the requester. + * Return the callback structure that was registered or an + * appropriate error on failure. + */ +static struct mic_intr_cb *mic_register_intr_callback(struct mic_device *mdev, + u8 idx, irqreturn_t (*func) (int irq, void *dev), + void *data) +{ + struct mic_intr_cb *intr_cb; + unsigned long flags; + int rc; + intr_cb = kmalloc(sizeof(struct mic_intr_cb), GFP_KERNEL); + + if (!intr_cb) + return ERR_PTR(-ENOMEM); + + intr_cb->func = func; + intr_cb->data = data; + intr_cb->cb_id = ida_simple_get(&mdev->irq_info.cb_ida, + 0, 0, GFP_KERNEL); + if (intr_cb->cb_id < 0) { + rc = intr_cb->cb_id; + goto ida_fail; + } + + spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags); + list_add_tail(&intr_cb->list, &mdev->irq_info.cb_list[idx]); + spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags); + + return intr_cb; +ida_fail: + kfree(intr_cb); + return ERR_PTR(rc); +} + +/** + * mic_unregister_intr_callback - Unregister the callback handler + * identified by its callback id. + * + * @mdev: pointer to the mic_device instance + * @idx: The callback structure id to be unregistered. + * Return the source id that was unregistered or MIC_NUM_OFFSETS if no + * such callback handler was found. + */ +static u8 mic_unregister_intr_callback(struct mic_device *mdev, u32 idx) +{ + struct list_head *pos, *tmp; + struct mic_intr_cb *intr_cb; + unsigned long flags; + int i; + + for (i = 0; i < MIC_NUM_OFFSETS; i++) { + spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags); + list_for_each_safe(pos, tmp, &mdev->irq_info.cb_list[i]) { + intr_cb = list_entry(pos, struct mic_intr_cb, list); + if (intr_cb->cb_id == idx) { + list_del(pos); + ida_simple_remove(&mdev->irq_info.cb_ida, + intr_cb->cb_id); + kfree(intr_cb); + spin_unlock_irqrestore( + &mdev->irq_info.mic_intr_lock, flags); + return i; + } + } + spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags); + } + return MIC_NUM_OFFSETS; +} + +/** + * mic_setup_msix - Initializes MSIx interrupts. + * + * @mdev: pointer to mic_device instance + * + * + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +static int mic_setup_msix(struct mic_device *mdev, struct pci_dev *pdev) +{ + int rc, i; + + mdev->irq_info.msix_entries = kmalloc(sizeof(struct msix_entry) * + MIC_MIN_MSIX, GFP_KERNEL); + if (!mdev->irq_info.msix_entries) { + rc = -ENOMEM; + goto err_nomem1; + } + + for (i = 0; i < MIC_MIN_MSIX; i++) + mdev->irq_info.msix_entries[i].entry = i; + + rc = pci_enable_msix(pdev, mdev->irq_info.msix_entries, + MIC_MIN_MSIX); + if (rc) { + dev_dbg(&pdev->dev, "Error enabling MSIx. rc = %d\n", rc); + goto err_enable_msix; + } + + mdev->irq_info.num_vectors = MIC_MIN_MSIX; + mdev->irq_info.mic_msi_map = kzalloc((sizeof(u32) * + mdev->irq_info.num_vectors), GFP_KERNEL); + + if (!mdev->irq_info.mic_msi_map) { + rc = -ENOMEM; + goto err_nomem2; + } + + dev_dbg(mdev->sdev->parent, + "%d MSIx irqs setup\n", mdev->irq_info.num_vectors); + return 0; +err_nomem2: + pci_disable_msix(pdev); +err_enable_msix: + kfree(mdev->irq_info.msix_entries); +err_nomem1: + mdev->irq_info.num_vectors = 0; + return rc; +} + +/** + * mic_setup_callbacks - Initialize data structures needed + * to handle callbacks. + * + * @mdev: pointer to mic_device instance + */ +static int mic_setup_callbacks(struct mic_device *mdev) +{ + int i; + + mdev->irq_info.cb_list = kmalloc(sizeof(struct list_head) * + MIC_NUM_OFFSETS, GFP_KERNEL); + if (!mdev->irq_info.cb_list) + return -ENOMEM; + + for (i = 0; i < MIC_NUM_OFFSETS; i++) + INIT_LIST_HEAD(&mdev->irq_info.cb_list[i]); + ida_init(&mdev->irq_info.cb_ida); + spin_lock_init(&mdev->irq_info.mic_intr_lock); + return 0; +} + +/** + * mic_release_callbacks - Uninitialize data structures needed + * to handle callbacks. + * + * @mdev: pointer to mic_device instance + */ +static void mic_release_callbacks(struct mic_device *mdev) +{ + unsigned long flags; + struct list_head *pos, *tmp; + struct mic_intr_cb *intr_cb; + int i; + + for (i = 0; i < MIC_NUM_OFFSETS; i++) { + spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags); + + if (list_empty(&mdev->irq_info.cb_list[i])) { + spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, + flags); + break; + } + + list_for_each_safe(pos, tmp, &mdev->irq_info.cb_list[i]) { + intr_cb = list_entry(pos, struct mic_intr_cb, list); + list_del(pos); + ida_simple_remove(&mdev->irq_info.cb_ida, + intr_cb->cb_id); + kfree(intr_cb); + } + spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags); + } + ida_destroy(&mdev->irq_info.cb_ida); + kfree(mdev->irq_info.cb_list); +} + +/** + * mic_setup_msi - Initializes MSI interrupts. + * + * @mdev: pointer to mic_device instance + * @pdev: PCI device structure + * + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +static int mic_setup_msi(struct mic_device *mdev, struct pci_dev *pdev) +{ + int rc; + + rc = pci_enable_msi(pdev); + if (rc) { + dev_dbg(&pdev->dev, "Error enabling MSI. rc = %d\n", rc); + return rc; + } + + mdev->irq_info.num_vectors = 1; + mdev->irq_info.mic_msi_map = kzalloc((sizeof(u32) * + mdev->irq_info.num_vectors), GFP_KERNEL); + + if (!mdev->irq_info.mic_msi_map) { + rc = -ENOMEM; + goto err_nomem1; + } + + rc = mic_setup_callbacks(mdev); + if (rc) { + dev_err(&pdev->dev, "Error setting up callbacks\n"); + goto err_nomem2; + } + + rc = request_irq(pdev->irq, mic_interrupt, 0 , "mic-msi", mdev); + if (rc) { + dev_err(&pdev->dev, "Error allocating MSI interrupt\n"); + goto err_irq_req_fail; + } + + dev_dbg(&pdev->dev, "%d MSI irqs setup\n", mdev->irq_info.num_vectors); + return 0; +err_irq_req_fail: + mic_release_callbacks(mdev); +err_nomem2: + kfree(mdev->irq_info.mic_msi_map); +err_nomem1: + pci_disable_msi(pdev); + mdev->irq_info.num_vectors = 0; + return rc; +} + +/** + * mic_setup_intx - Initializes legacy interrupts. + * + * @mdev: pointer to mic_device instance + * @pdev: PCI device structure + * + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +static int mic_setup_intx(struct mic_device *mdev, struct pci_dev *pdev) +{ + int rc; + + pci_msi_off(pdev); + + /* Enable intx */ + pci_intx(pdev, 1); + rc = mic_setup_callbacks(mdev); + if (rc) { + dev_err(&pdev->dev, "Error setting up callbacks\n"); + goto err_nomem; + } + + rc = request_irq(pdev->irq, mic_interrupt, + IRQF_SHARED, "mic-intx", mdev); + if (rc) + goto err; + + dev_dbg(&pdev->dev, "intx irq setup\n"); + return 0; +err: + mic_release_callbacks(mdev); +err_nomem: + return rc; +} + +/** + * mic_next_db - Retrieve the next doorbell interrupt source id. + * The id is picked sequentially from the available pool of + * doorlbell ids. + * + * @mdev: pointer to the mic_device instance. + * + * Returns the next doorbell interrupt source. + */ +int mic_next_db(struct mic_device *mdev) +{ + int next_db; + + next_db = mdev->irq_info.next_avail_src % + mdev->intr_info->intr_len[MIC_INTR_DB]; + mdev->irq_info.next_avail_src++; + return next_db; +} + +#define COOKIE_ID_SHIFT 16 +#define GET_ENTRY(cookie) ((cookie) & 0xFFFF) +#define GET_OFFSET(cookie) ((cookie) >> COOKIE_ID_SHIFT) +#define MK_COOKIE(x, y) ((x) | (y) << COOKIE_ID_SHIFT) + +/** + * mic_request_irq - request an irq. mic_mutex needs + * to be held before calling this function. + * + * @mdev: pointer to mic_device instance + * @func: The callback function that handles the interrupt. + * The function needs to call ack_interrupts + * (mdev->ops->ack_interrupt(mdev)) when handling the interrupts. + * @name: The ASCII name of the callee requesting the irq. + * @data: private data that is returned back when calling the + * function handler. + * @intr_src: The source id of the requester. Its the doorbell id + * for Doorbell interrupts and DMA channel id for DMA interrupts. + * @type: The type of interrupt. Values defined in mic_intr_type + * + * returns: The cookie that is transparent to the caller. Passed + * back when calling mic_free_irq. An appropriate error code + * is returned on failure. Caller needs to use IS_ERR(return_val) + * to check for failure and PTR_ERR(return_val) to obtained the + * error code. + * + */ +struct mic_irq *mic_request_irq(struct mic_device *mdev, + irqreturn_t (*func)(int irq, void *dev), + const char *name, void *data, int intr_src, + enum mic_intr_type type) +{ + u16 offset; + int rc = 0; + struct msix_entry *msix = NULL; + unsigned long cookie = 0; + u16 entry; + struct mic_intr_cb *intr_cb; + struct pci_dev *pdev = container_of(mdev->sdev->parent, + struct pci_dev, dev); + + offset = mic_map_src_to_offset(mdev, intr_src, type); + if (offset >= MIC_NUM_OFFSETS) { + dev_err(mdev->sdev->parent, + "Error mapping index %d to a valid source id.\n", + intr_src); + rc = -EINVAL; + goto err; + } + + if (mdev->irq_info.num_vectors > 1) { + msix = mic_get_available_vector(mdev); + if (!msix) { + dev_err(mdev->sdev->parent, + "No MSIx vectors available for use.\n"); + rc = -ENOSPC; + goto err; + } + + rc = request_irq(msix->vector, func, 0, name, data); + if (rc) { + dev_dbg(mdev->sdev->parent, + "request irq failed rc = %d\n", rc); + goto err; + } + entry = msix->entry; + mdev->irq_info.mic_msi_map[entry] |= BIT(offset); + mdev->intr_ops->program_msi_to_src_map(mdev, + entry, offset, true); + cookie = MK_COOKIE(entry, offset); + dev_dbg(mdev->sdev->parent, "irq: %d assigned for src: %d\n", + msix->vector, intr_src); + } else { + intr_cb = mic_register_intr_callback(mdev, + offset, func, data); + if (IS_ERR(intr_cb)) { + dev_err(mdev->sdev->parent, + "No available callback entries for use\n"); + rc = PTR_ERR(intr_cb); + goto err; + } + + entry = 0; + if (pci_dev_msi_enabled(pdev)) { + mdev->irq_info.mic_msi_map[entry] |= (1 << offset); + mdev->intr_ops->program_msi_to_src_map(mdev, + entry, offset, true); + } + cookie = MK_COOKIE(entry, intr_cb->cb_id); + dev_dbg(mdev->sdev->parent, "callback %d registered for src: %d\n", + intr_cb->cb_id, intr_src); + } + return (struct mic_irq *)cookie; +err: + return ERR_PTR(rc); +} + +/** + * mic_free_irq - free irq. mic_mutex + * needs to be held before calling this function. + * + * @mdev: pointer to mic_device instance + * @cookie: cookie obtained during a successful call to mic_request_irq + * @data: private data specified by the calling function during the + * mic_request_irq + * + * returns: none. + */ +void mic_free_irq(struct mic_device *mdev, + struct mic_irq *cookie, void *data) +{ + u32 offset; + u32 entry; + u8 src_id; + unsigned int irq; + struct pci_dev *pdev = container_of(mdev->sdev->parent, + struct pci_dev, dev); + + entry = GET_ENTRY((unsigned long)cookie); + offset = GET_OFFSET((unsigned long)cookie); + if (mdev->irq_info.num_vectors > 1) { + if (entry >= mdev->irq_info.num_vectors) { + dev_warn(mdev->sdev->parent, + "entry %d should be < num_irq %d\n", + entry, mdev->irq_info.num_vectors); + return; + } + irq = mdev->irq_info.msix_entries[entry].vector; + free_irq(irq, data); + mdev->irq_info.mic_msi_map[entry] &= ~(BIT(offset)); + mdev->intr_ops->program_msi_to_src_map(mdev, + entry, offset, false); + + dev_dbg(mdev->sdev->parent, "irq: %d freed\n", irq); + } else { + irq = pdev->irq; + src_id = mic_unregister_intr_callback(mdev, offset); + if (src_id >= MIC_NUM_OFFSETS) { + dev_warn(mdev->sdev->parent, "Error unregistering callback\n"); + return; + } + if (pci_dev_msi_enabled(pdev)) { + mdev->irq_info.mic_msi_map[entry] &= ~(BIT(src_id)); + mdev->intr_ops->program_msi_to_src_map(mdev, + entry, src_id, false); + } + dev_dbg(mdev->sdev->parent, "callback %d unregistered for src: %d\n", + offset, src_id); + } +} + +/** + * mic_setup_interrupts - Initializes interrupts. + * + * @mdev: pointer to mic_device instance + * @pdev: PCI device structure + * + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +int mic_setup_interrupts(struct mic_device *mdev, struct pci_dev *pdev) +{ + int rc; + + rc = mic_setup_msix(mdev, pdev); + if (!rc) + goto done; + + rc = mic_setup_msi(mdev, pdev); + if (!rc) + goto done; + + rc = mic_setup_intx(mdev, pdev); + if (rc) { + dev_err(mdev->sdev->parent, "no usable interrupts\n"); + return rc; + } +done: + mdev->intr_ops->enable_interrupts(mdev); + return 0; +} + +/** + * mic_free_interrupts - Frees interrupts setup by mic_setup_interrupts + * + * @mdev: pointer to mic_device instance + * @pdev: PCI device structure + * + * returns none. + */ +void mic_free_interrupts(struct mic_device *mdev, struct pci_dev *pdev) +{ + int i; + + mdev->intr_ops->disable_interrupts(mdev); + if (mdev->irq_info.num_vectors > 1) { + for (i = 0; i < mdev->irq_info.num_vectors; i++) { + if (mdev->irq_info.mic_msi_map[i]) + dev_warn(&pdev->dev, "irq %d may still be in use.\n", + mdev->irq_info.msix_entries[i].vector); + } + kfree(mdev->irq_info.mic_msi_map); + kfree(mdev->irq_info.msix_entries); + pci_disable_msix(pdev); + } else { + if (pci_dev_msi_enabled(pdev)) { + free_irq(pdev->irq, mdev); + kfree(mdev->irq_info.mic_msi_map); + pci_disable_msi(pdev); + } else { + free_irq(pdev->irq, mdev); + } + mic_release_callbacks(mdev); + } +} + +/** + * mic_intr_restore - Restore MIC interrupt registers. + * + * @mdev: pointer to mic_device instance. + * + * Restore the interrupt registers to values previously + * stored in the SW data structures. mic_mutex needs to + * be held before calling this function. + * + * returns None. + */ +void mic_intr_restore(struct mic_device *mdev) +{ + int entry, offset; + struct pci_dev *pdev = container_of(mdev->sdev->parent, + struct pci_dev, dev); + + if (!pci_dev_msi_enabled(pdev)) + return; + + for (entry = 0; entry < mdev->irq_info.num_vectors; entry++) { + for (offset = 0; offset < MIC_NUM_OFFSETS; offset++) { + if (mdev->irq_info.mic_msi_map[entry] & BIT(offset)) + mdev->intr_ops->program_msi_to_src_map(mdev, + entry, offset, true); + } + } +} diff --git a/drivers/misc/mic/host/mic_intr.h b/drivers/misc/mic/host/mic_intr.h new file mode 100644 index 0000000..6091aa9 --- /dev/null +++ b/drivers/misc/mic/host/mic_intr.h @@ -0,0 +1,137 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2013 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC Host driver. + * + */ +#ifndef _MIC_INTR_H_ +#define _MIC_INTR_H_ + +/* + * The minimum number of msix vectors required for normal operation. + * 3 for virtio network, console and block devices. + * 1 for card shutdown notifications. + */ +#define MIC_MIN_MSIX 4 +#define MIC_NUM_OFFSETS 32 + +/** + * mic_intr_source - The type of source that will generate + * the interrupt.The number of types needs to be in sync with + * MIC_NUM_INTR_TYPES + * + * MIC_INTR_DB: The source is a doorbell + * MIC_INTR_DMA: The source is a DMA channel + * MIC_INTR_ERR: The source is an error interrupt e.g. SBOX ERR + * MIC_NUM_INTR_TYPES: Total number of interrupt sources. + */ +enum mic_intr_type { + MIC_INTR_DB = 0, + MIC_INTR_DMA, + MIC_INTR_ERR, + MIC_NUM_INTR_TYPES +}; + +/** + * struct mic_intr_info - Contains h/w specific interrupt sources + * information. + * + * @intr_start_idx: Contains the starting indexes of the + * interrupt types. + * @intr_len: Contains the length of the interrupt types. + */ +struct mic_intr_info { + u16 intr_start_idx[MIC_NUM_INTR_TYPES]; + u16 intr_len[MIC_NUM_INTR_TYPES]; +}; + +/** + * struct mic_irq_info - OS specific irq information + * + * @next_avail_src: next available doorbell that can be assigned. + * @msix_entries: msix entries allocated while setting up MSI-x + * @mic_msi_map: The MSI/MSI-x mapping information. + * @num_vectors: The number of MSI/MSI-x vectors that have been allocated. + * @cb_ida: callback ID allocator to track the callbacks registered. + * @mic_intr_lock: spinlock to protect the interrupt callback list. + * @cb_list: Array of callback lists one for each source. + */ +struct mic_irq_info { + int next_avail_src; + struct msix_entry *msix_entries; + u32 *mic_msi_map; + u16 num_vectors; + struct ida cb_ida; + spinlock_t mic_intr_lock; + struct list_head *cb_list; +}; + +/** + * struct mic_intr_cb - Interrupt callback structure. + * + * @func: The callback function + * @data: Private data of the requester. + * @cb_id: The callback id. Identifies this callback. + * @list: list head pointing to the next callback structure. + */ +struct mic_intr_cb { + irqreturn_t (*func) (int irq, void *data); + void *data; + int cb_id; + struct list_head list; +}; + +/** + * struct mic_irq - opaque pointer used as cookie + */ +struct mic_irq; + +/* Forward declaration */ +struct mic_device; + +/** + * struct mic_hw_intr_ops: MIC HW specific interrupt operations + * @intr_init: Initialize H/W specific interrupt information. + * @enable_interrupts: Enable interrupts from the hardware. + * @disable_interrupts: Disable interrupts from the hardware. + * @program_msi_to_src_map: Update MSI mapping registers with + * irq information. + * @read_msi_to_src_map: Read MSI mapping registers containing + * irq information. + */ +struct mic_hw_intr_ops { + void (*intr_init)(struct mic_device *mdev); + void (*enable_interrupts)(struct mic_device *mdev); + void (*disable_interrupts)(struct mic_device *mdev); + void (*program_msi_to_src_map) (struct mic_device *mdev, + int idx, int intr_src, bool set); + u32 (*read_msi_to_src_map) (struct mic_device *mdev, + int idx); +}; + +int mic_next_db(struct mic_device *mdev); +struct mic_irq *mic_request_irq(struct mic_device *mdev, + irqreturn_t (*func)(int irq, void *data), + const char *name, void *data, int intr_src, + enum mic_intr_type type); + +void mic_free_irq(struct mic_device *mdev, + struct mic_irq *cookie, void *data); +int mic_setup_interrupts(struct mic_device *mdev, struct pci_dev *pdev); +void mic_free_interrupts(struct mic_device *mdev, struct pci_dev *pdev); +void mic_intr_restore(struct mic_device *mdev); +#endif diff --git a/drivers/misc/mic/host/mic_main.c b/drivers/misc/mic/host/mic_main.c index 228c96c..332a15e 100644 --- a/drivers/misc/mic/host/mic_main.c +++ b/drivers/misc/mic/host/mic_main.c @@ -23,13 +23,13 @@ * 2) Enable per vring interrupt support. */ #include <linux/fs.h> -#include <linux/idr.h> #include <linux/module.h> #include <linux/pci.h> #include "../common/mic_device.h" #include "mic_device.h" #include "mic_x100.h" +#include "mic_smpt.h" static const char mic_driver_name[] = "mic"; @@ -75,6 +75,8 @@ static void mic_ops_init(struct mic_device *mdev) switch (mdev->family) { case MIC_FAMILY_X100: mdev->ops = &mic_x100_ops; + mdev->intr_ops = &mic_x100_intr_ops; + mdev->smpt_ops = &mic_x100_smpt_ops; break; default: break; @@ -132,6 +134,8 @@ mic_device_init(struct mic_device *mdev, struct pci_dev *pdev) mdev->stepping = pdev->revision; mic_ops_init(mdev); mic_sysfs_init(mdev); + mutex_init(&mdev->mic_mutex); + mdev->irq_info.next_avail_src = 0; } /** @@ -201,6 +205,18 @@ static int mic_probe(struct pci_dev *pdev, goto unmap_mmio; } + mdev->intr_ops->intr_init(mdev); + rc = mic_setup_interrupts(mdev, pdev); + if (rc) { + dev_err(&pdev->dev, "mic_setup_interrupts failed %d\n", rc); + goto unmap_aper; + } + rc = mic_smpt_init(mdev); + if (rc) { + dev_err(&pdev->dev, "smpt_init failed %d\n", rc); + goto free_interrupts; + } + pci_set_drvdata(pdev, mdev); mdev->sdev = device_create_with_groups(g_mic_class, &pdev->dev, @@ -210,9 +226,13 @@ static int mic_probe(struct pci_dev *pdev, rc = PTR_ERR(mdev->sdev); dev_err(&pdev->dev, "device_create_with_groups failed rc %d\n", rc); - goto unmap_aper; + goto smpt_uninit; } return 0; +smpt_uninit: + mic_smpt_uninit(mdev); +free_interrupts: + mic_free_interrupts(mdev, pdev); unmap_aper: iounmap(mdev->aper.va); unmap_mmio: @@ -246,6 +266,8 @@ static void mic_remove(struct pci_dev *pdev) return; device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id)); + mic_smpt_uninit(mdev); + mic_free_interrupts(mdev, pdev); iounmap(mdev->mmio.va); iounmap(mdev->aper.va); pci_release_regions(pdev); diff --git a/drivers/misc/mic/host/mic_smpt.c b/drivers/misc/mic/host/mic_smpt.c new file mode 100644 index 0000000..a346207 --- /dev/null +++ b/drivers/misc/mic/host/mic_smpt.c @@ -0,0 +1,442 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2013 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC Host driver. + * + */ +#include <linux/pci.h> + +#include "../common/mic_device.h" +#include "mic_device.h" +#include "mic_smpt.h" + +static inline u64 mic_system_page_mask(struct mic_device *mdev) +{ + return (1ULL << mdev->smpt->info.page_shift) - 1ULL; +} + +static inline u8 mic_sys_addr_to_smpt(struct mic_device *mdev, dma_addr_t pa) +{ + return (pa - mdev->smpt->info.base) >> mdev->smpt->info.page_shift; +} + +static inline u64 mic_smpt_to_pa(struct mic_device *mdev, u8 index) +{ + return mdev->smpt->info.base + (index * mdev->smpt->info.page_size); +} + +static inline u64 mic_smpt_offset(struct mic_device *mdev, dma_addr_t pa) +{ + return pa & mic_system_page_mask(mdev); +} + +static inline u64 mic_smpt_align_low(struct mic_device *mdev, dma_addr_t pa) +{ + return ALIGN(pa - mic_system_page_mask(mdev), + mdev->smpt->info.page_size); +} + +static inline u64 mic_smpt_align_high(struct mic_device *mdev, dma_addr_t pa) +{ + return ALIGN(pa, mdev->smpt->info.page_size); +} + +/* Total Cumulative system memory accessible by MIC across all SMPT entries */ +static inline u64 mic_max_system_memory(struct mic_device *mdev) +{ + return mdev->smpt->info.num_reg * mdev->smpt->info.page_size; +} + +/* Maximum system memory address accessible by MIC */ +static inline u64 mic_max_system_addr(struct mic_device *mdev) +{ + return mdev->smpt->info.base + mic_max_system_memory(mdev) - 1ULL; +} + +/* Check if the DMA address is a MIC system memory address */ +static inline bool +mic_is_system_addr(struct mic_device *mdev, dma_addr_t pa) +{ + return pa >= mdev->smpt->info.base && pa <= mic_max_system_addr(mdev); +} + +/* Populate an SMPT entry and update the reference counts. */ +static void mic_add_smpt_entry(int spt, s64 *ref, u64 addr, + int entries, struct mic_device *mdev) +{ + struct mic_smpt_info *smpt_info = mdev->smpt; + int i; + + for (i = spt; i < spt + entries; i++, + addr += smpt_info->info.page_size) { + if (!smpt_info->entry[i].ref_count && + (smpt_info->entry[i].dma_addr != addr)) { + mdev->smpt_ops->set(mdev, addr, i); + smpt_info->entry[i].dma_addr = addr; + } + smpt_info->entry[i].ref_count += ref[i - spt]; + } +} + +/* + * Find an available MIC address in MIC SMPT address space + * for a given DMA address and size. + */ +static dma_addr_t mic_smpt_op(struct mic_device *mdev, u64 dma_addr, + int entries, s64 *ref, size_t size) +{ + int spt; + int ae = 0; + int i; + unsigned long flags; + dma_addr_t mic_addr = 0; + dma_addr_t addr = dma_addr; + struct mic_smpt_info *smpt_info = mdev->smpt; + + spin_lock_irqsave(&smpt_info->smpt_lock, flags); + + /* find existing entries */ + for (i = 0; i < smpt_info->info.num_reg; i++) { + if (smpt_info->entry[i].dma_addr == addr) { + ae++; + addr += smpt_info->info.page_size; + } else if (ae) /* cannot find contiguous entries */ + goto not_found; + + if (ae == entries) + goto found; + } + + /* find free entry */ + for (ae = 0, i = 0; i < smpt_info->info.num_reg; i++) { + ae = (smpt_info->entry[i].ref_count == 0) ? ae + 1 : 0; + if (ae == entries) + goto found; + } + +not_found: + spin_unlock_irqrestore(&smpt_info->smpt_lock, flags); + return mic_addr; + +found: + spt = i - entries + 1; + mic_addr = mic_smpt_to_pa(mdev, spt); + mic_add_smpt_entry(spt, ref, dma_addr, entries, mdev); + smpt_info->map_count++; + smpt_info->ref_count += (s64)size; + spin_unlock_irqrestore(&smpt_info->smpt_lock, flags); + return mic_addr; +} + +/* + * Returns number of smpt entries needed for dma_addr to dma_addr + size + * also returns the reference count array for each of those entries + * and the starting smpt address + */ +static int mic_get_smpt_ref_count(struct mic_device *mdev, dma_addr_t dma_addr, + size_t size, s64 *ref, u64 *smpt_start) +{ + u64 start = dma_addr; + u64 end = dma_addr + size; + int i = 0; + + while (start < end) { + ref[i++] = min(mic_smpt_align_high(mdev, start + 1), + end) - start; + start = mic_smpt_align_high(mdev, start + 1); + } + + if (smpt_start) + *smpt_start = mic_smpt_align_low(mdev, dma_addr); + + return i; +} + +/* + * mic_to_dma_addr - Converts a MIC address to a DMA address. + * + * @mdev: pointer to mic_device instance. + * @mic_addr: MIC address. + * + * returns a DMA address. + */ +static dma_addr_t +mic_to_dma_addr(struct mic_device *mdev, dma_addr_t mic_addr) +{ + struct mic_smpt_info *smpt_info = mdev->smpt; + int spt; + dma_addr_t dma_addr; + + if (!mic_is_system_addr(mdev, mic_addr)) { + dev_err(mdev->sdev->parent, + "mic_addr is invalid. mic_addr = 0x%llx\n", mic_addr); + return -EINVAL; + } + spt = mic_sys_addr_to_smpt(mdev, mic_addr); + dma_addr = smpt_info->entry[spt].dma_addr + + mic_smpt_offset(mdev, mic_addr); + return dma_addr; +} + +/** + * mic_map - Maps a DMA address to a MIC physical address. + * + * @mdev: pointer to mic_device instance. + * @dma_addr: DMA address. + * @size: Size of the region to be mapped. + * + * This API converts the DMA address provided to a DMA address understood + * by MIC. Caller should check for errors by calling mic_map_error(..). + * + * returns DMA address as required by MIC. + */ +dma_addr_t mic_map(struct mic_device *mdev, dma_addr_t dma_addr, size_t size) +{ + dma_addr_t mic_addr = 0; + int num_entries; + s64 *ref; + u64 smpt_start; + + if (!size || size > mic_max_system_memory(mdev)) + return mic_addr; + + ref = kmalloc(mdev->smpt->info.num_reg * sizeof(s64), GFP_KERNEL); + if (!ref) + return mic_addr; + + num_entries = mic_get_smpt_ref_count(mdev, dma_addr, size, + ref, &smpt_start); + + /* Set the smpt table appropriately and get 16G aligned mic address */ + mic_addr = mic_smpt_op(mdev, smpt_start, num_entries, ref, size); + + kfree(ref); + + /* + * If mic_addr is zero then its an error case + * since mic_addr can never be zero. + * else generate mic_addr by adding the 16G offset in dma_addr + */ + if (!mic_addr && MIC_FAMILY_X100 == mdev->family) { + dev_err(mdev->sdev->parent, + "mic_map failed dma_addr 0x%llx size 0x%lx\n", + dma_addr, size); + return mic_addr; + } else { + return mic_addr + mic_smpt_offset(mdev, dma_addr); + } +} + +/** + * mic_unmap - Unmaps a MIC physical address. + * + * @mdev: pointer to mic_device instance. + * @mic_addr: MIC physical address. + * @size: Size of the region to be unmapped. + * + * This API unmaps the mappings created by mic_map(..). + * + * returns None. + */ +void mic_unmap(struct mic_device *mdev, dma_addr_t mic_addr, size_t size) +{ + struct mic_smpt_info *smpt_info = mdev->smpt; + s64 *ref; + int num_smpt; + int spt; + int i; + unsigned long flags; + + if (!size) + return; + + if (!mic_is_system_addr(mdev, mic_addr)) { + dev_err(mdev->sdev->parent, + "invalid address: 0x%llx\n", mic_addr); + return; + } + + spt = mic_sys_addr_to_smpt(mdev, mic_addr); + ref = kmalloc(mdev->smpt->info.num_reg * sizeof(s64), GFP_KERNEL); + if (!ref) + return; + + /* Get number of smpt entries to be mapped, ref count array */ + num_smpt = mic_get_smpt_ref_count(mdev, mic_addr, size, ref, NULL); + + spin_lock_irqsave(&smpt_info->smpt_lock, flags); + smpt_info->unmap_count++; + smpt_info->ref_count -= (s64)size; + + for (i = spt; i < spt + num_smpt; i++) { + smpt_info->entry[i].ref_count -= ref[i - spt]; + if (smpt_info->entry[i].ref_count < 0) + dev_warn(mdev->sdev->parent, + "ref count for entry %d is negative\n", i); + } + spin_unlock_irqrestore(&smpt_info->smpt_lock, flags); + kfree(ref); +} + +/** + * mic_map_single - Maps a virtual address to a MIC physical address. + * + * @mdev: pointer to mic_device instance. + * @va: Kernel direct mapped virtual address. + * @size: Size of the region to be mapped. + * + * This API calls pci_map_single(..) for the direct mapped virtual address + * and then converts the DMA address provided to a DMA address understood + * by MIC. Caller should check for errors by calling mic_map_error(..). + * + * returns DMA address as required by MIC. + */ +dma_addr_t mic_map_single(struct mic_device *mdev, void *va, size_t size) +{ + dma_addr_t mic_addr = 0; + struct pci_dev *pdev = container_of(mdev->sdev->parent, + struct pci_dev, dev); + dma_addr_t dma_addr = + pci_map_single(pdev, va, size, PCI_DMA_BIDIRECTIONAL); + + if (!pci_dma_mapping_error(pdev, dma_addr)) { + mic_addr = mic_map(mdev, dma_addr, size); + if (!mic_addr) { + dev_err(mdev->sdev->parent, + "mic_map failed dma_addr 0x%llx size 0x%lx\n", + dma_addr, size); + pci_unmap_single(pdev, dma_addr, + size, PCI_DMA_BIDIRECTIONAL); + } + } + return mic_addr; +} + +/** + * mic_unmap_single - Unmaps a MIC physical address. + * + * @mdev: pointer to mic_device instance. + * @mic_addr: MIC physical address. + * @size: Size of the region to be unmapped. + * + * This API unmaps the mappings created by mic_map_single(..). + * + * returns None. + */ +void +mic_unmap_single(struct mic_device *mdev, dma_addr_t mic_addr, size_t size) +{ + struct pci_dev *pdev = container_of(mdev->sdev->parent, + struct pci_dev, dev); + dma_addr_t dma_addr = mic_to_dma_addr(mdev, mic_addr); + mic_unmap(mdev, mic_addr, size); + pci_unmap_single(pdev, dma_addr, size, PCI_DMA_BIDIRECTIONAL); +} + +/** + * mic_smpt_init - Initialize MIC System Memory Page Tables. + * + * @mdev: pointer to mic_device instance. + * + * returns 0 for success and -errno for error. + */ +int mic_smpt_init(struct mic_device *mdev) +{ + int i, err = 0; + dma_addr_t dma_addr; + struct mic_smpt_info *smpt_info; + + mdev->smpt = kmalloc(sizeof(*mdev->smpt), GFP_KERNEL); + if (!mdev->smpt) + return -ENOMEM; + + smpt_info = mdev->smpt; + mdev->smpt_ops->init(mdev); + smpt_info->entry = kmalloc(sizeof(struct mic_smpt) + * smpt_info->info.num_reg, GFP_KERNEL); + if (!smpt_info->entry) { + err = -ENOMEM; + goto free_smpt; + } + spin_lock_init(&smpt_info->smpt_lock); + for (i = 0; i < smpt_info->info.num_reg; i++) { + dma_addr = i * smpt_info->info.page_size; + smpt_info->entry[i].dma_addr = dma_addr; + smpt_info->entry[i].ref_count = 0; + mdev->smpt_ops->set(mdev, dma_addr, i); + } + smpt_info->ref_count = 0; + smpt_info->map_count = 0; + smpt_info->unmap_count = 0; + return 0; +free_smpt: + kfree(smpt_info); + return err; +} + +/** + * mic_smpt_uninit - UnInitialize MIC System Memory Page Tables. + * + * @mdev: pointer to mic_device instance. + * + * returns None. + */ +void mic_smpt_uninit(struct mic_device *mdev) +{ + struct mic_smpt_info *smpt_info = mdev->smpt; + int i; + + dev_dbg(mdev->sdev->parent, + "nodeid %d SMPT ref count %lld map %lld unmap %lld\n", + mdev->id, smpt_info->ref_count, + smpt_info->map_count, smpt_info->unmap_count); + + for (i = 0; i < smpt_info->info.num_reg; i++) { + dev_dbg(mdev->sdev->parent, + "SMPT entry[%d] dma_addr = 0x%llx ref_count = %lld\n", + i, smpt_info->entry[i].dma_addr, + smpt_info->entry[i].ref_count); + if (smpt_info->entry[i].ref_count) + dev_warn(mdev->sdev->parent, + "ref count for entry %d is not zero\n", i); + } + kfree(smpt_info->entry); + kfree(smpt_info); +} + +/** + * mic_smpt_restore - Restore MIC System Memory Page Tables. + * + * @mdev: pointer to mic_device instance. + * + * Restore the SMPT registers to values previously stored in the + * SW data structures. Some MIC steppings lose register state + * across resets and this API should be called for performing + * a restore operation if required. + * + * returns None. + */ +void mic_smpt_restore(struct mic_device *mdev) +{ + int i; + dma_addr_t dma_addr; + + for (i = 0; i < mdev->smpt->info.num_reg; i++) { + dma_addr = mdev->smpt->entry[i].dma_addr; + mdev->smpt_ops->set(mdev, dma_addr, i); + } +} diff --git a/drivers/misc/mic/host/mic_smpt.h b/drivers/misc/mic/host/mic_smpt.h new file mode 100644 index 0000000..51970ab --- /dev/null +++ b/drivers/misc/mic/host/mic_smpt.h @@ -0,0 +1,98 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2013 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC Host driver. + * + */ +#ifndef MIC_SMPT_H +#define MIC_SMPT_H +/** + * struct mic_smpt_ops - MIC HW specific SMPT operations. + * @init: Initialize hardware specific SMPT information in mic_smpt_hw_info. + * @set: Set the value for a particular SMPT entry. + */ +struct mic_smpt_ops { + void (*init)(struct mic_device *mdev); + void (*set)(struct mic_device *mdev, dma_addr_t dma_addr, u8 index); +}; + +/** + * struct mic_smpt - MIC SMPT entry information. + * @dma_addr: Base DMA address for this SMPT entry. + * @ref_count: Number of active mappings for this SMPT entry in bytes. + */ +struct mic_smpt { + dma_addr_t dma_addr; + s64 ref_count; +}; + +/** + * struct mic_smpt_hw_info - MIC SMPT hardware specific information. + * @num_reg: Number of SMPT registers. + * @page_shift: System memory page shift. + * @page_size: System memory page size. + * @base: System address base. + */ +struct mic_smpt_hw_info { + u8 num_reg; + u8 page_shift; + u64 page_size; + u64 base; +}; + +/** + * struct mic_smpt_info - MIC SMPT information. + * @entry: Array of SMPT entries. + * @smpt_lock: Spin lock protecting access to SMPT data structures. + * @info: Hardware specific SMPT information. + * @ref_count: Number of active SMPT mappings (for debug). + * @map_count: Number of SMPT mappings created (for debug). + * @unmap_count: Number of SMPT mappings destroyed (for debug). + */ +struct mic_smpt_info { + struct mic_smpt *entry; + spinlock_t smpt_lock; + struct mic_smpt_hw_info info; + s64 ref_count; + s64 map_count; + s64 unmap_count; +}; + +dma_addr_t mic_map_single(struct mic_device *mdev, void *va, size_t size); +void mic_unmap_single(struct mic_device *mdev, + dma_addr_t mic_addr, size_t size); +dma_addr_t mic_map(struct mic_device *mdev, + dma_addr_t dma_addr, size_t size); +void mic_unmap(struct mic_device *mdev, dma_addr_t mic_addr, size_t size); + +/** + * mic_map_error - Check a MIC address for errors. + * + * @mdev: pointer to mic_device instance. + * + * returns Whether there was an error during mic_map..(..) APIs. + */ +static inline bool mic_map_error(dma_addr_t mic_addr) +{ + return !mic_addr; +} + +int mic_smpt_init(struct mic_device *mdev); +void mic_smpt_uninit(struct mic_device *mdev); +void mic_smpt_restore(struct mic_device *mdev); + +#endif diff --git a/drivers/misc/mic/host/mic_x100.c b/drivers/misc/mic/host/mic_x100.c index da481b1..b637316 100644 --- a/drivers/misc/mic/host/mic_x100.c +++ b/drivers/misc/mic/host/mic_x100.c @@ -24,6 +24,7 @@ #include "../common/mic_device.h" #include "mic_device.h" #include "mic_x100.h" +#include "mic_smpt.h" /** * mic_x100_write_spad - write to the scratchpad register @@ -67,9 +68,255 @@ mic_x100_read_spad(struct mic_device *mdev, unsigned int idx) return val; } +/** + * mic_x100_enable_interrupts - Enable interrupts. + * @mdev: pointer to mic_device instance + */ +static void mic_x100_enable_interrupts(struct mic_device *mdev) +{ + u32 reg; + struct mic_mw *mw = &mdev->mmio; + u32 sice0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICE0; + u32 siac0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SIAC0; + + reg = mic_mmio_read(mw, sice0); + reg |= MIC_X100_SBOX_DBR_BITS(0xf) | MIC_X100_SBOX_DMA_BITS(0xff); + mic_mmio_write(mw, reg, sice0); + + /* + * Enable auto-clear when enabling interrupts. Applicable only for + * MSI-x. Legacy and MSI mode cannot have auto-clear enabled. + */ + if (mdev->irq_info.num_vectors > 1) { + reg = mic_mmio_read(mw, siac0); + reg |= MIC_X100_SBOX_DBR_BITS(0xf) | + MIC_X100_SBOX_DMA_BITS(0xff); + mic_mmio_write(mw, reg, siac0); + } +} + +/** + * mic_x100_disable_interrupts - Disable interrupts. + * @mdev: pointer to mic_device instance + */ +static void mic_x100_disable_interrupts(struct mic_device *mdev) +{ + u32 reg; + struct mic_mw *mw = &mdev->mmio; + u32 sice0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICE0; + u32 siac0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SIAC0; + u32 sicc0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICC0; + + reg = mic_mmio_read(mw, sice0); + mic_mmio_write(mw, reg, sicc0); + + if (mdev->irq_info.num_vectors > 1) { + reg = mic_mmio_read(mw, siac0); + reg &= ~(MIC_X100_SBOX_DBR_BITS(0xf) | + MIC_X100_SBOX_DMA_BITS(0xff)); + mic_mmio_write(mw, reg, siac0); + } +} + +/** + * mic_x100_send_sbox_intr - Send an MIC_X100_SBOX interrupt to MIC. + * @mdev: pointer to mic_device instance + */ +static void mic_x100_send_sbox_intr(struct mic_device *mdev, + int doorbell) +{ + struct mic_mw *mw = &mdev->mmio; + u64 apic_icr_offset = MIC_X100_SBOX_APICICR0 + doorbell * 8; + u32 apicicr_low = mic_mmio_read(mw, + MIC_X100_SBOX_BASE_ADDRESS + apic_icr_offset); + + /* for MIC we need to make sure we "hit" the send_icr bit (13) */ + apicicr_low = (apicicr_low | (1 << 13)); + + /* Ensure that the interrupt is ordered w.r.t. previous stores. */ + wmb(); + mic_mmio_write(mw, apicicr_low, + MIC_X100_SBOX_BASE_ADDRESS + apic_icr_offset); +} + +/** + * mic_x100_send_rdmasr_intr - Send an RDMASR interrupt to MIC. + * @mdev: pointer to mic_device instance + */ +static void mic_x100_send_rdmasr_intr(struct mic_device *mdev, + int doorbell) +{ + int rdmasr_offset = MIC_X100_SBOX_RDMASR0 + (doorbell << 2); + /* Ensure that the interrupt is ordered w.r.t. previous stores. */ + wmb(); + mic_mmio_write(&mdev->mmio, 0, + MIC_X100_SBOX_BASE_ADDRESS + rdmasr_offset); +} + +/** + * __mic_x100_send_intr - Send interrupt to MIC. + * @mdev: pointer to mic_device instance + * @doorbell: doorbell number. + */ +static void mic_x100_send_intr(struct mic_device *mdev, int doorbell) +{ + int rdmasr_db; + if (doorbell < MIC_X100_NUM_SBOX_IRQ) { + mic_x100_send_sbox_intr(mdev, doorbell); + } else { + rdmasr_db = doorbell - MIC_X100_NUM_SBOX_IRQ + + MIC_X100_RDMASR_IRQ_BASE; + mic_x100_send_rdmasr_intr(mdev, rdmasr_db); + } +} + +/** + * mic_ack_interrupt - Device specific interrupt handling. + * @mdev: pointer to mic_device instance + * + * Returns: bitmask of doorbell events triggered. + */ +static u32 mic_x100_ack_interrupt(struct mic_device *mdev) +{ + u32 reg = 0; + struct mic_mw *mw = &mdev->mmio; + u32 sicr0 = MIC_X100_SBOX_BASE_ADDRESS + MIC_X100_SBOX_SICR0; + + /* Clear pending bit array. */ + if (MIC_A0_STEP == mdev->stepping) + mic_mmio_write(mw, 1, MIC_X100_SBOX_BASE_ADDRESS + + MIC_X100_SBOX_MSIXPBACR); + + if (mdev->irq_info.num_vectors <= 1) { + reg = mic_mmio_read(mw, sicr0); + + if (unlikely(!reg)) + goto done; + + mic_mmio_write(mw, reg, sicr0); + } + + if (mdev->stepping >= MIC_B0_STEP) + mdev->intr_ops->enable_interrupts(mdev); +done: + return reg; +} + +/** + * mic_x100_hw_intr_init - Initialize h/w specific interrupt + * information. + * @mdev: pointer to mic_device instance + */ +static void mic_x100_hw_intr_init(struct mic_device *mdev) +{ + mdev->intr_info = (struct mic_intr_info *) mic_x100_intr_init; +} + +/** + * mic_x100_read_msi_to_src_map - read from the MSI mapping registers + * @mdev: pointer to mic_device instance + * @idx: index to the mapping register, 0 based + * + * This function allows reading of the 32bit MSI mapping register. + * + * RETURNS: The value in the register. + */ +static u32 +mic_x100_read_msi_to_src_map(struct mic_device *mdev, int idx) +{ + return mic_mmio_read(&mdev->mmio, + MIC_X100_SBOX_BASE_ADDRESS + + MIC_X100_SBOX_MXAR0 + idx * 4); +} + +/** + * mic_x100_program_msi_to_src_map - program the MSI mapping registers + * @mdev: pointer to mic_device instance + * @idx: index to the mapping register, 0 based + * @offset: The bit offset in the register that needs to be updated. + * @set: boolean specifying if the bit in the specified offset needs + * to be set or cleared. + * + * RETURNS: None. + */ +static void +mic_x100_program_msi_to_src_map(struct mic_device *mdev, + int idx, int offset, bool set) +{ + unsigned long reg; + struct mic_mw *mw = &mdev->mmio; + u32 mxar = MIC_X100_SBOX_BASE_ADDRESS + + MIC_X100_SBOX_MXAR0 + idx * 4; + + reg = mic_mmio_read(mw, mxar); + if (set) + __set_bit(offset, ®); + else + __clear_bit(offset, ®); + mic_mmio_write(mw, reg, mxar); +} + +/** + * mic_x100_smpt_set - Update an SMPT entry with a DMA address. + * @mdev: pointer to mic_device instance + * + * RETURNS: none. + */ +static void +mic_x100_smpt_set(struct mic_device *mdev, dma_addr_t dma_addr, u8 index) +{ +#define SNOOP_ON (0 << 0) +#define SNOOP_OFF (1 << 0) +/* + * Sbox Smpt Reg Bits: + * Bits 31:2 Host address + * Bits 1 RSVD + * Bits 0 No snoop + */ +#define BUILD_SMPT(NO_SNOOP, HOST_ADDR) \ + (u32)(((HOST_ADDR) << 2) | ((NO_SNOOP) & 0x01)) + + uint32_t smpt_reg_val = BUILD_SMPT(SNOOP_ON, + dma_addr >> mdev->smpt->info.page_shift); + mic_mmio_write(&mdev->mmio, smpt_reg_val, + MIC_X100_SBOX_BASE_ADDRESS + + MIC_X100_SBOX_SMPT00 + (4 * index)); +} + +/** + * mic_x100_smpt_hw_init - Initialize SMPT X100 specific fields. + * @mdev: pointer to mic_device instance + * + * RETURNS: none. + */ +static void mic_x100_smpt_hw_init(struct mic_device *mdev) +{ + struct mic_smpt_hw_info *info = &mdev->smpt->info; + + info->num_reg = 32; + info->page_shift = 34; + info->page_size = (1ULL << info->page_shift); + info->base = 0x8000000000ULL; +} + +struct mic_smpt_ops mic_x100_smpt_ops = { + .init = mic_x100_smpt_hw_init, + .set = mic_x100_smpt_set, +}; + struct mic_hw_ops mic_x100_ops = { .aper_bar = MIC_X100_APER_BAR, .mmio_bar = MIC_X100_MMIO_BAR, .read_spad = mic_x100_read_spad, .write_spad = mic_x100_write_spad, + .send_intr = mic_x100_send_intr, + .ack_interrupt = mic_x100_ack_interrupt, +}; + +struct mic_hw_intr_ops mic_x100_intr_ops = { + .intr_init = mic_x100_hw_intr_init, + .enable_interrupts = mic_x100_enable_interrupts, + .disable_interrupts = mic_x100_disable_interrupts, + .program_msi_to_src_map = mic_x100_program_msi_to_src_map, + .read_msi_to_src_map = mic_x100_read_msi_to_src_map, }; diff --git a/drivers/misc/mic/host/mic_x100.h b/drivers/misc/mic/host/mic_x100.h index 1f4e630..642cae9 100644 --- a/drivers/misc/mic/host/mic_x100.h +++ b/drivers/misc/mic/host/mic_x100.h @@ -42,6 +42,45 @@ #define MIC_X100_SBOX_BASE_ADDRESS 0x00010000 #define MIC_X100_SBOX_SPAD0 0x0000AB20 +#define MIC_X100_SBOX_SICR0_DBR(x) ((x) & 0xf) +#define MIC_X100_SBOX_SICR0_DMA(x) (((x) >> 8) & 0xff) +#define MIC_X100_SBOX_SICE0_DBR(x) ((x) & 0xf) +#define MIC_X100_SBOX_DBR_BITS(x) ((x) & 0xf) +#define MIC_X100_SBOX_SICE0_DMA(x) (((x) >> 8) & 0xff) +#define MIC_X100_SBOX_DMA_BITS(x) (((x) & 0xff) << 8) + +#define MIC_X100_SBOX_APICICR0 0x0000A9D0 +#define MIC_X100_SBOX_SICR0 0x00009004 +#define MIC_X100_SBOX_SICE0 0x0000900C +#define MIC_X100_SBOX_SICC0 0x00009010 +#define MIC_X100_SBOX_SIAC0 0x00009014 +#define MIC_X100_SBOX_MSIXPBACR 0x00009084 +#define MIC_X100_SBOX_MXAR0 0x00009044 +#define MIC_X100_SBOX_SMPT00 0x00003100 +#define MIC_X100_SBOX_RDMASR0 0x0000B180 + +#define MIC_X100_DOORBELL_IDX_START 0 +#define MIC_X100_NUM_DOORBELL 4 +#define MIC_X100_DMA_IDX_START 8 +#define MIC_X100_NUM_DMA 8 +#define MIC_X100_ERR_IDX_START 30 +#define MIC_X100_NUM_ERR 1 + +#define MIC_X100_NUM_SBOX_IRQ 8 +#define MIC_X100_NUM_RDMASR_IRQ 8 +#define MIC_X100_RDMASR_IRQ_BASE 17 + +static const u16 mic_x100_intr_init[] = { + MIC_X100_DOORBELL_IDX_START, + MIC_X100_DMA_IDX_START, + MIC_X100_ERR_IDX_START, + MIC_X100_NUM_DOORBELL, + MIC_X100_NUM_DMA, + MIC_X100_NUM_ERR, +}; + extern struct mic_hw_ops mic_x100_ops; +extern struct mic_smpt_ops mic_x100_smpt_ops; +extern struct mic_hw_intr_ops mic_x100_intr_ops; #endif |