diff options
Diffstat (limited to 'drivers/dma/ioatdma.c')
| -rw-r--r-- | drivers/dma/ioatdma.c | 840 |
1 files changed, 840 insertions, 0 deletions
diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c new file mode 100644 index 0000000..0fdf7fb --- /dev/null +++ b/drivers/dma/ioatdma.c @@ -0,0 +1,840 @@ +/* + * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * 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. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ + +/* + * This driver supports an Intel I/OAT DMA engine, which does asynchronous + * copy operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include "ioatdma.h" +#include "ioatdma_io.h" +#include "ioatdma_registers.h" +#include "ioatdma_hw.h" + +#define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) +#define to_ioat_device(dev) container_of(dev, struct ioat_device, common) +#define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) + +/* internal functions */ +static int __devinit ioat_probe(struct pci_dev *pdev, const struct pci_device_id *ent); +static void __devexit ioat_remove(struct pci_dev *pdev); + +static int enumerate_dma_channels(struct ioat_device *device) +{ + u8 xfercap_scale; + u32 xfercap; + int i; + struct ioat_dma_chan *ioat_chan; + + device->common.chancnt = ioatdma_read8(device, IOAT_CHANCNT_OFFSET); + xfercap_scale = ioatdma_read8(device, IOAT_XFERCAP_OFFSET); + xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); + + for (i = 0; i < device->common.chancnt; i++) { + ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL); + if (!ioat_chan) { + device->common.chancnt = i; + break; + } + + ioat_chan->device = device; + ioat_chan->reg_base = device->reg_base + (0x80 * (i + 1)); + ioat_chan->xfercap = xfercap; + spin_lock_init(&ioat_chan->cleanup_lock); + spin_lock_init(&ioat_chan->desc_lock); + INIT_LIST_HEAD(&ioat_chan->free_desc); + INIT_LIST_HEAD(&ioat_chan->used_desc); + /* This should be made common somewhere in dmaengine.c */ + ioat_chan->common.device = &device->common; + ioat_chan->common.client = NULL; + list_add_tail(&ioat_chan->common.device_node, + &device->common.channels); + } + return device->common.chancnt; +} + +static struct ioat_desc_sw *ioat_dma_alloc_descriptor( + struct ioat_dma_chan *ioat_chan, + int flags) +{ + struct ioat_dma_descriptor *desc; + struct ioat_desc_sw *desc_sw; + struct ioat_device *ioat_device; + dma_addr_t phys; + + ioat_device = to_ioat_device(ioat_chan->common.device); + desc = pci_pool_alloc(ioat_device->dma_pool, flags, &phys); + if (unlikely(!desc)) + return NULL; + + desc_sw = kzalloc(sizeof(*desc_sw), flags); + if (unlikely(!desc_sw)) { + pci_pool_free(ioat_device->dma_pool, desc, phys); + return NULL; + } + + memset(desc, 0, sizeof(*desc)); + desc_sw->hw = desc; + desc_sw->phys = phys; + + return desc_sw; +} + +#define INITIAL_IOAT_DESC_COUNT 128 + +static void ioat_start_null_desc(struct ioat_dma_chan *ioat_chan); + +/* returns the actual number of allocated descriptors */ +static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_desc_sw *desc = NULL; + u16 chanctrl; + u32 chanerr; + int i; + LIST_HEAD(tmp_list); + + /* + * In-use bit automatically set by reading chanctrl + * If 0, we got it, if 1, someone else did + */ + chanctrl = ioatdma_chan_read16(ioat_chan, IOAT_CHANCTRL_OFFSET); + if (chanctrl & IOAT_CHANCTRL_CHANNEL_IN_USE) + return -EBUSY; + + /* Setup register to interrupt and write completion status on error */ + chanctrl = IOAT_CHANCTRL_CHANNEL_IN_USE | + IOAT_CHANCTRL_ERR_INT_EN | + IOAT_CHANCTRL_ANY_ERR_ABORT_EN | + IOAT_CHANCTRL_ERR_COMPLETION_EN; + ioatdma_chan_write16(ioat_chan, IOAT_CHANCTRL_OFFSET, chanctrl); + + chanerr = ioatdma_chan_read32(ioat_chan, IOAT_CHANERR_OFFSET); + if (chanerr) { + printk("IOAT: CHANERR = %x, clearing\n", chanerr); + ioatdma_chan_write32(ioat_chan, IOAT_CHANERR_OFFSET, chanerr); + } + + /* Allocate descriptors */ + for (i = 0; i < INITIAL_IOAT_DESC_COUNT; i++) { + desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL); + if (!desc) { + printk(KERN_ERR "IOAT: Only %d initial descriptors\n", i); + break; + } + list_add_tail(&desc->node, &tmp_list); + } + spin_lock_bh(&ioat_chan->desc_lock); + list_splice(&tmp_list, &ioat_chan->free_desc); + spin_unlock_bh(&ioat_chan->desc_lock); + + /* allocate a completion writeback area */ + /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ + ioat_chan->completion_virt = + pci_pool_alloc(ioat_chan->device->completion_pool, + GFP_KERNEL, + &ioat_chan->completion_addr); + memset(ioat_chan->completion_virt, 0, + sizeof(*ioat_chan->completion_virt)); + ioatdma_chan_write32(ioat_chan, IOAT_CHANCMP_OFFSET_LOW, + ((u64) ioat_chan->completion_addr) & 0x00000000FFFFFFFF); + ioatdma_chan_write32(ioat_chan, IOAT_CHANCMP_OFFSET_HIGH, + ((u64) ioat_chan->completion_addr) >> 32); + + ioat_start_null_desc(ioat_chan); + return i; +} + +static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan); + +static void ioat_dma_free_chan_resources(struct dma_chan *chan) +{ + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_device *ioat_device = to_ioat_device(chan->device); + struct ioat_desc_sw *desc, *_desc; + u16 chanctrl; + int in_use_descs = 0; + + ioat_dma_memcpy_cleanup(ioat_chan); + + ioatdma_chan_write8(ioat_chan, IOAT_CHANCMD_OFFSET, IOAT_CHANCMD_RESET); + + spin_lock_bh(&ioat_chan->desc_lock); + list_for_each_entry_safe(desc, _desc, &ioat_chan->used_desc, node) { + in_use_descs++; + list_del(&desc->node); + pci_pool_free(ioat_device->dma_pool, desc->hw, desc->phys); + kfree(desc); + } + list_for_each_entry_safe(desc, _desc, &ioat_chan->free_desc, node) { + list_del(&desc->node); + pci_pool_free(ioat_device->dma_pool, desc->hw, desc->phys); + kfree(desc); + } + spin_unlock_bh(&ioat_chan->desc_lock); + + pci_pool_free(ioat_device->completion_pool, + ioat_chan->completion_virt, + ioat_chan->completion_addr); + + /* one is ok since we left it on there on purpose */ + if (in_use_descs > 1) + printk(KERN_ERR "IOAT: Freeing %d in use descriptors!\n", + in_use_descs - 1); + + ioat_chan->last_completion = ioat_chan->completion_addr = 0; + + /* Tell hw the chan is free */ + chanctrl = ioatdma_chan_read16(ioat_chan, IOAT_CHANCTRL_OFFSET); + chanctrl &= ~IOAT_CHANCTRL_CHANNEL_IN_USE; + ioatdma_chan_write16(ioat_chan, IOAT_CHANCTRL_OFFSET, chanctrl); +} + +/** + * do_ioat_dma_memcpy - actual function that initiates a IOAT DMA transaction + * @chan: IOAT DMA channel handle + * @dest: DMA destination address + * @src: DMA source address + * @len: transaction length in bytes + */ + +static dma_cookie_t do_ioat_dma_memcpy(struct ioat_dma_chan *ioat_chan, + dma_addr_t dest, + dma_addr_t src, + size_t len) +{ + struct ioat_desc_sw *first; + struct ioat_desc_sw *prev; + struct ioat_desc_sw *new; + dma_cookie_t cookie; + LIST_HEAD(new_chain); + u32 copy; + size_t orig_len; + dma_addr_t orig_src, orig_dst; + unsigned int desc_count = 0; + unsigned int append = 0; + + if (!ioat_chan || !dest || !src) + return -EFAULT; + + if (!len) + return ioat_chan->common.cookie; + + orig_len = len; + orig_src = src; + orig_dst = dest; + + first = NULL; + prev = NULL; + + spin_lock_bh(&ioat_chan->desc_lock); + + while (len) { + if (!list_empty(&ioat_chan->free_desc)) { + new = to_ioat_desc(ioat_chan->free_desc.next); + list_del(&new->node); + } else { + /* try to get another desc */ + new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); + /* will this ever happen? */ + /* TODO add upper limit on these */ + BUG_ON(!new); + } + + copy = min((u32) len, ioat_chan->xfercap); + + new->hw->size = copy; + new->hw->ctl = 0; + new->hw->src_addr = src; + new->hw->dst_addr = dest; + new->cookie = 0; + + /* chain together the physical address list for the HW */ + if (!first) + first = new; + else + prev->hw->next = (u64) new->phys; + + prev = new; + + len -= copy; + dest += copy; + src += copy; + + list_add_tail(&new->node, &new_chain); + desc_count++; + } + new->hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS; + new->hw->next = 0; + + /* cookie incr and addition to used_list must be atomic */ + + cookie = ioat_chan->common.cookie; + cookie++; + if (cookie < 0) + cookie = 1; + ioat_chan->common.cookie = new->cookie = cookie; + + pci_unmap_addr_set(new, src, orig_src); + pci_unmap_addr_set(new, dst, orig_dst); + pci_unmap_len_set(new, src_len, orig_len); + pci_unmap_len_set(new, dst_len, orig_len); + + /* write address into NextDescriptor field of last desc in chain */ + to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = first->phys; + list_splice_init(&new_chain, ioat_chan->used_desc.prev); + + ioat_chan->pending += desc_count; + if (ioat_chan->pending >= 20) { + append = 1; + ioat_chan->pending = 0; + } + + spin_unlock_bh(&ioat_chan->desc_lock); + + if (append) + ioatdma_chan_write8(ioat_chan, + IOAT_CHANCMD_OFFSET, + IOAT_CHANCMD_APPEND); + return cookie; +} + +/** + * ioat_dma_memcpy_buf_to_buf - wrapper that takes src & dest bufs + * @chan: IOAT DMA channel handle + * @dest: DMA destination address + * @src: DMA source address + * @len: transaction length in bytes + */ + +static dma_cookie_t ioat_dma_memcpy_buf_to_buf(struct dma_chan *chan, + void *dest, + void *src, + size_t len) +{ + dma_addr_t dest_addr; + dma_addr_t src_addr; + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + + dest_addr = pci_map_single(ioat_chan->device->pdev, + dest, len, PCI_DMA_FROMDEVICE); + src_addr = pci_map_single(ioat_chan->device->pdev, + src, len, PCI_DMA_TODEVICE); + + return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len); +} + +/** + * ioat_dma_memcpy_buf_to_pg - wrapper, copying from a buf to a page + * @chan: IOAT DMA channel handle + * @page: pointer to the page to copy to + * @offset: offset into that page + * @src: DMA source address + * @len: transaction length in bytes + */ + +static dma_cookie_t ioat_dma_memcpy_buf_to_pg(struct dma_chan *chan, + struct page *page, + unsigned int offset, + void *src, + size_t len) +{ + dma_addr_t dest_addr; + dma_addr_t src_addr; + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + + dest_addr = pci_map_page(ioat_chan->device->pdev, + page, offset, len, PCI_DMA_FROMDEVICE); + src_addr = pci_map_single(ioat_chan->device->pdev, + src, len, PCI_DMA_TODEVICE); + + return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len); +} + +/** + * ioat_dma_memcpy_pg_to_pg - wrapper, copying between two pages + * @chan: IOAT DMA channel handle + * @dest_pg: pointer to the page to copy to + * @dest_off: offset into that page + * @src_pg: pointer to the page to copy from + * @src_off: offset into that page + * @len: transaction length in bytes. This is guaranteed to not make a copy + * across a page boundary. + */ + +static dma_cookie_t ioat_dma_memcpy_pg_to_pg(struct dma_chan *chan, + struct page *dest_pg, + unsigned int dest_off, + struct page *src_pg, + unsigned int src_off, + size_t len) +{ + dma_addr_t dest_addr; + dma_addr_t src_addr; + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + + dest_addr = pci_map_page(ioat_chan->device->pdev, + dest_pg, dest_off, len, PCI_DMA_FROMDEVICE); + src_addr = pci_map_page(ioat_chan->device->pdev, + src_pg, src_off, len, PCI_DMA_TODEVICE); + + return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len); +} + +/** + * ioat_dma_memcpy_issue_pending - push potentially unrecognoized appended descriptors to hw + * @chan: DMA channel handle + */ + +static void ioat_dma_memcpy_issue_pending(struct dma_chan *chan) +{ + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + + if (ioat_chan->pending != 0) { + ioat_chan->pending = 0; + ioatdma_chan_write8(ioat_chan, + IOAT_CHANCMD_OFFSET, + IOAT_CHANCMD_APPEND); + } +} + +static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *chan) +{ + unsigned long phys_complete; + struct ioat_desc_sw *desc, *_desc; + dma_cookie_t cookie = 0; + + prefetch(chan->completion_virt); + + if (!spin_trylock(&chan->cleanup_lock)) + return; + + /* The completion writeback can happen at any time, + so reads by the driver need to be atomic operations + The descriptor physical addresses are limited to 32-bits + when the CPU can only do a 32-bit mov */ + +#if (BITS_PER_LONG == 64) + phys_complete = + chan->completion_virt->full & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; +#else + phys_complete = chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK; +#endif + + if ((chan->completion_virt->full & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == + IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { + printk("IOAT: Channel halted, chanerr = %x\n", + ioatdma_chan_read32(chan, IOAT_CHANERR_OFFSET)); + + /* TODO do something to salvage the situation */ + } + + if (phys_complete == chan->last_completion) { + spin_unlock(&chan->cleanup_lock); + return; + } + + spin_lock_bh(&chan->desc_lock); + list_for_each_entry_safe(desc, _desc, &chan->used_desc, node) { + + /* + * Incoming DMA requests may use multiple descriptors, due to + * exceeding xfercap, perhaps. If so, only the last one will + * have a cookie, and require unmapping. + */ + if (desc->cookie) { + cookie = desc->cookie; + + /* yes we are unmapping both _page and _single alloc'd + regions with unmap_page. Is this *really* that bad? + */ + pci_unmap_page(chan->device->pdev, + pci_unmap_addr(desc, dst), + pci_unmap_len(desc, dst_len), + PCI_DMA_FROMDEVICE); + pci_unmap_page(chan->device->pdev, + pci_unmap_addr(desc, src), + pci_unmap_len(desc, src_len), + PCI_DMA_TODEVICE); + } + + if (desc->phys != phys_complete) { + /* a completed entry, but not the last, so cleanup */ + list_del(&desc->node); + list_add_tail(&desc->node, &chan->free_desc); + } else { + /* last used desc. Do not remove, so we can append from + it, but don't look at it next time, either */ + desc->cookie = 0; + + /* TODO check status bits? */ + break; + } + } + + spin_unlock_bh(&chan->desc_lock); + + chan->last_completion = phys_complete; + if (cookie != 0) + chan->completed_cookie = cookie; + + spin_unlock(&chan->cleanup_lock); +} + +/** + * ioat_dma_is_complete - poll the status of a IOAT DMA transaction + * @chan: IOAT DMA channel handle + * @cookie: DMA transaction identifier + */ + +static enum dma_status ioat_dma_is_complete(struct dma_chan *chan, + dma_cookie_t cookie, + dma_cookie_t *done, + dma_cookie_t *used) +{ + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + dma_cookie_t last_used; + dma_cookie_t last_complete; + enum dma_status ret; + + last_used = chan->cookie; + last_complete = ioat_chan->completed_cookie; + + if (done) + *done= last_complete; + if (used) + *used = last_used; + + ret = dma_async_is_complete(cookie, last_complete, last_used); + if (ret == DMA_SUCCESS) + return ret; + + ioat_dma_memcpy_cleanup(ioat_chan); + + last_used = chan->cookie; + last_complete = ioat_chan->completed_cookie; + + if (done) + *done= last_complete; + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + +/* PCI API */ + +static struct pci_device_id ioat_pci_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, + { 0, } +}; + +static struct pci_driver ioat_pci_drv = { + .name = "ioatdma", + .id_table = ioat_pci_tbl, + .probe = ioat_probe, + .remove = __devexit_p(ioat_remove), +}; + +static irqreturn_t ioat_do_interrupt(int irq, void *data, struct pt_regs *regs) +{ + struct ioat_device *instance = data; + unsigned long attnstatus; + u8 intrctrl; + + intrctrl = ioatdma_read8(instance, IOAT_INTRCTRL_OFFSET); + + if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN)) + return IRQ_NONE; + + if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) { + ioatdma_write8(instance, IOAT_INTRCTRL_OFFSET, intrctrl); + return IRQ_NONE; + } + + attnstatus = ioatdma_read32(instance, IOAT_ATTNSTATUS_OFFSET); + + printk(KERN_ERR "ioatdma error: interrupt! status %lx\n", attnstatus); + + ioatdma_write8(instance, IOAT_INTRCTRL_OFFSET, intrctrl); + return IRQ_HANDLED; +} + +static void ioat_start_null_desc(struct ioat_dma_chan *ioat_chan) +{ + struct ioat_desc_sw *desc; + + spin_lock_bh(&ioat_chan->desc_lock); + + if (!list_empty(&ioat_chan->free_desc)) { + desc = to_ioat_desc(ioat_chan->free_desc.next); + list_del(&desc->node); + } else { + /* try to get another desc */ + spin_unlock_bh(&ioat_chan->desc_lock); + desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL); + spin_lock_bh(&ioat_chan->desc_lock); + /* will this ever happen? */ + BUG_ON(!desc); + } + + desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL; + desc->hw->next = 0; + + list_add_tail(&desc->node, &ioat_chan->used_desc); + spin_unlock_bh(&ioat_chan->desc_lock); + +#if (BITS_PER_LONG == 64) + ioatdma_chan_write64(ioat_chan, IOAT_CHAINADDR_OFFSET, desc->phys); +#else + ioatdma_chan_write32(ioat_chan, + IOAT_CHAINADDR_OFFSET_LOW, + (u32) desc->phys); + ioatdma_chan_write32(ioat_chan, IOAT_CHAINADDR_OFFSET_HIGH, 0); +#endif + ioatdma_chan_write8(ioat_chan, IOAT_CHANCMD_OFFSET, IOAT_CHANCMD_START); +} + +/* + * Perform a IOAT transaction to verify the HW works. + */ +#define IOAT_TEST_SIZE 2000 + +static int ioat_self_test(struct ioat_device *device) +{ + int i; + u8 *src; + u8 *dest; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + int err = 0; + + src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, SLAB_KERNEL); + if (!src) + return -ENOMEM; + dest = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, SLAB_KERNEL); + if (!dest) { + kfree(src); + return -ENOMEM; + } + + /* Fill in src buffer */ + for (i = 0; i < IOAT_TEST_SIZE; i++) + src[i] = (u8)i; + + /* Start copy, using first DMA channel */ + dma_chan = container_of(device->common.channels.next, + struct dma_chan, + device_node); + if (ioat_dma_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + cookie = ioat_dma_memcpy_buf_to_buf(dma_chan, dest, src, IOAT_TEST_SIZE); + ioat_dma_memcpy_issue_pending(dma_chan); + msleep(1); + + if (ioat_dma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) { + printk(KERN_ERR "ioatdma: Self-test copy timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + if (memcmp(src, dest, IOAT_TEST_SIZE)) { + printk(KERN_ERR "ioatdma: Self-test copy failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + +free_resources: + ioat_dma_free_chan_resources(dma_chan); +out: + kfree(src); + kfree(dest); + return err; +} + +static int __devinit ioat_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + int err; + unsigned long mmio_start, mmio_len; + void *reg_base; + struct ioat_device *device; + + err = pci_enable_device(pdev); + if (err) + goto err_enable_device; + + err = pci_set_dma_mask(pdev, DMA_64BIT_MASK); + if (err) + err = pci_set_dma_mask(pdev, DMA_32BIT_MASK); + if (err) + goto err_set_dma_mask; + + err = pci_request_regions(pdev, ioat_pci_drv.name); + if (err) + goto err_request_regions; + + mmio_start = pci_resource_start(pdev, 0); + mmio_len = pci_resource_len(pdev, 0); + + reg_base = ioremap(mmio_start, mmio_len); + if (!reg_base) { + err = -ENOMEM; + goto err_ioremap; + } + + device = kzalloc(sizeof(*device), GFP_KERNEL); + if (!device) { + err = -ENOMEM; + goto err_kzalloc; + } + + /* DMA coherent memory pool for DMA descriptor allocations */ + device->dma_pool = pci_pool_create("dma_desc_pool", pdev, + sizeof(struct ioat_dma_descriptor), 64, 0); + if (!device->dma_pool) { + err = -ENOMEM; + goto err_dma_pool; + } + + device->completion_pool = pci_pool_create("completion_pool", pdev, sizeof(u64), SMP_CACHE_BYTES, SMP_CACHE_BYTES); + if (!device->completion_pool) { + err = -ENOMEM; + goto err_completion_pool; + } + + device->pdev = pdev; + pci_set_drvdata(pdev, device); +#ifdef CONFIG_PCI_MSI + if (pci_enable_msi(pdev) == 0) { + device->msi = 1; + } else { + device->msi = 0; + } +#endif + err = request_irq(pdev->irq, &ioat_do_interrupt, SA_SHIRQ, "ioat", + device); + if (err) + goto err_irq; + + device->reg_base = reg_base; + + ioatdma_write8(device, IOAT_INTRCTRL_OFFSET, IOAT_INTRCTRL_MASTER_INT_EN); + pci_set_master(pdev); + + INIT_LIST_HEAD(&device->common.channels); + enumerate_dma_channels(device); + + device->common.device_alloc_chan_resources = ioat_dma_alloc_chan_resources; + device->common.device_free_chan_resources = ioat_dma_free_chan_resources; + device->common.device_memcpy_buf_to_buf = ioat_dma_memcpy_buf_to_buf; + device->common.device_memcpy_buf_to_pg = ioat_dma_memcpy_buf_to_pg; + device->common.device_memcpy_pg_to_pg = ioat_dma_memcpy_pg_to_pg; + device->common.device_memcpy_complete = ioat_dma_is_complete; + device->common.device_memcpy_issue_pending = ioat_dma_memcpy_issue_pending; + printk(KERN_INFO "Intel(R) I/OAT DMA Engine found, %d channels\n", + device->common.chancnt); + + err = ioat_self_test(device); + if (err) + goto err_self_test; + + dma_async_device_register(&device->common); + + return 0; + +err_self_test: +err_irq: + pci_pool_destroy(device->completion_pool); +err_completion_pool: + pci_pool_destroy(device->dma_pool); +err_dma_pool: + kfree(device); +err_kzalloc: + iounmap(reg_base); +err_ioremap: + pci_release_regions(pdev); +err_request_regions: +err_set_dma_mask: + pci_disable_device(pdev); +err_enable_device: + return err; +} + +static void __devexit ioat_remove(struct pci_dev *pdev) +{ + struct ioat_device *device; + struct dma_chan *chan, *_chan; + struct ioat_dma_chan *ioat_chan; + + device = pci_get_drvdata(pdev); + dma_async_device_unregister(&device->common); + + free_irq(device->pdev->irq, device); +#ifdef CONFIG_PCI_MSI + if (device->msi) + pci_disable_msi(device->pdev); +#endif + pci_pool_destroy(device->dma_pool); + pci_pool_destroy(device->completion_pool); + iounmap(device->reg_base); + pci_release_regions(pdev); + pci_disable_device(pdev); + list_for_each_entry_safe(chan, _chan, &device->common.channels, device_node) { + ioat_chan = to_ioat_chan(chan); + list_del(&chan->device_node); + kfree(ioat_chan); + } + kfree(device); +} + +/* MODULE API */ +MODULE_VERSION("1.7"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Intel Corporation"); + +static int __init ioat_init_module(void) +{ + /* it's currently unsafe to unload this module */ + /* if forced, worst case is that rmmod hangs */ + if (THIS_MODULE != NULL) + THIS_MODULE->unsafe = 1; + + return pci_module_init(&ioat_pci_drv); +} + +module_init(ioat_init_module); + +static void __exit ioat_exit_module(void) +{ + pci_unregister_driver(&ioat_pci_drv); +} + +module_exit(ioat_exit_module); |