Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992790AbXEBGPV (ORCPT ); Wed, 2 May 2007 02:15:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992789AbXEBGPV (ORCPT ); Wed, 2 May 2007 02:15:21 -0400 Received: from mga09.intel.com ([134.134.136.24]:9181 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992790AbXEBGPN (ORCPT ); Wed, 2 May 2007 02:15:13 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.14,477,1170662400"; d="scan'208";a="82425900" From: Dan Williams Subject: [PATCH 01/16] dmaengine: add base support for the async_tx api To: neilb@suse.de, akpm@linux-foundation.org, christopher.leech@intel.com Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org Date: Tue, 01 May 2007 23:15:10 -0700 Message-ID: <20070502061510.7066.64145.stgit@dwillia2-linux.ch.intel.com> In-Reply-To: <20070502060949.7066.357.stgit@dwillia2-linux.ch.intel.com> References: <20070502060949.7066.357.stgit@dwillia2-linux.ch.intel.com> User-Agent: StGIT/0.12.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 35871 Lines: 1022 In preparation for the async_tx (dmaengine client) API this patch: 1/ introduces struct dma_async_tx_descriptor as a common field for all dmaengine software descriptors. The primary role of this structure is to enable callbacks at transaction completion time, and support transaction chains that span multiple channels 2/ converts the device_memcpy_* methods into separate prep, set src/dest, and submit stages 3/ adds support for capabilities beyond memcpy (xor, memset, xor zero sum, completion interrupts). place holders for future capabilities are also included 4/ converts ioatdma to the new semantics Changelog: * drop dma mapping methods, suggested by Chris Leech * fix ioat_dma_dependency_added, also caught by Andrew Morton * fix dma_sync_wait, change from Andrew Morton * uninline large functions, change from Andrew Morton * add tx->callback = NULL to dmaengine calls to interoperate with async_tx calls * hookup ioat_tx_submit * convert channel capabilities to a 'cpumask_t like' bitmap Cc: Chris Leech Signed-off-by: Dan Williams --- drivers/dma/dmaengine.c | 182 +++++++++++++++++++++++++++++++++ drivers/dma/ioatdma.c | 248 ++++++++++++++++++++------------------------- drivers/dma/ioatdma.h | 8 + include/linux/dmaengine.h | 245 ++++++++++++++++++++++++++++---------------- 4 files changed, 454 insertions(+), 229 deletions(-) diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 322ee29..8a49103 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -59,6 +59,7 @@ #include #include +#include #include #include #include @@ -66,6 +67,7 @@ #include #include #include +#include static DEFINE_MUTEX(dma_list_mutex); static LIST_HEAD(dma_device_list); @@ -165,6 +167,24 @@ static struct dma_chan *dma_client_chan_alloc(struct dma_client *client) return NULL; } +enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie) +{ + enum dma_status status; + unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); + + dma_async_issue_pending(chan); + do { + status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); + if (time_after_eq(jiffies, dma_sync_wait_timeout)) { + printk(KERN_ERR "dma_sync_wait_timeout!\n"); + return DMA_ERROR; + } + } while (status == DMA_IN_PROGRESS); + + return status; +} +EXPORT_SYMBOL(dma_sync_wait); + /** * dma_chan_cleanup - release a DMA channel's resources * @kref: kernel reference structure that contains the DMA channel device @@ -322,6 +342,28 @@ int dma_async_device_register(struct dma_device *device) if (!device) return -ENODEV; + /* validate device routines */ + BUG_ON(dma_has_cap(DMA_MEMCPY, device->cap_mask) && + !device->device_prep_dma_memcpy); + BUG_ON(dma_has_cap(DMA_XOR, device->cap_mask) && + !device->device_prep_dma_xor); + BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) && + !device->device_prep_dma_zero_sum); + BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) && + !device->device_prep_dma_memset); + BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) && + !device->device_prep_dma_interrupt); + + BUG_ON(!device->device_alloc_chan_resources); + BUG_ON(!device->device_free_chan_resources); + BUG_ON(!device->device_tx_submit); + BUG_ON(!device->device_set_dest); + BUG_ON(!device->device_set_src); + BUG_ON(!device->device_dependency_added); + BUG_ON(!device->device_is_tx_complete); + BUG_ON(!device->device_issue_pending); + BUG_ON(!device->dev); + init_completion(&device->done); kref_init(&device->refcount); device->dev_id = id++; @@ -397,6 +439,146 @@ void dma_async_device_unregister(struct dma_device *device) } EXPORT_SYMBOL(dma_async_device_unregister); +/** + * dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses + * @chan: DMA channel to offload copy to + * @dest: destination address (virtual) + * @src: source address (virtual) + * @len: length + * + * Both @dest and @src must be mappable to a bus address according to the + * DMA mapping API rules for streaming mappings. + * Both @dest and @src must stay memory resident (kernel memory or locked + * user space pages). + */ +dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan, + void *dest, void *src, size_t len) +{ + struct dma_device *dev = chan->device; + struct dma_async_tx_descriptor *tx; + dma_addr_t addr; + dma_cookie_t cookie; + int cpu; + + tx = dev->device_prep_dma_memcpy(chan, len, 0); + if (!tx) + return -ENOMEM; + + tx->ack = 1; + tx->callback = NULL; + addr = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE); + dev->device_set_src(addr, tx, 0); + addr = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE); + dev->device_set_dest(addr, tx, 0); + cookie = dev->device_tx_submit(tx); + + cpu = get_cpu(); + per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; + per_cpu_ptr(chan->local, cpu)->memcpy_count++; + put_cpu(); + + return cookie; +} +EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf); + +/** + * dma_async_memcpy_buf_to_pg - offloaded copy from address to page + * @chan: DMA channel to offload copy to + * @page: destination page + * @offset: offset in page to copy to + * @kdata: source address (virtual) + * @len: length + * + * Both @page/@offset and @kdata must be mappable to a bus address according + * to the DMA mapping API rules for streaming mappings. + * Both @page/@offset and @kdata must stay memory resident (kernel memory or + * locked user space pages) + */ +dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan, + struct page *page, unsigned int offset, void *kdata, size_t len) +{ + struct dma_device *dev = chan->device; + struct dma_async_tx_descriptor *tx; + dma_addr_t addr; + dma_cookie_t cookie; + int cpu; + + tx = dev->device_prep_dma_memcpy(chan, len, 0); + if (!tx) + return -ENOMEM; + + tx->ack = 1; + tx->callback = NULL; + addr = dma_map_single(dev->dev, kdata, len, DMA_TO_DEVICE); + dev->device_set_src(addr, tx, 0); + addr = dma_map_page(dev->dev, page, offset, len, DMA_FROM_DEVICE); + dev->device_set_dest(addr, tx, 0); + cookie = dev->device_tx_submit(tx); + + cpu = get_cpu(); + per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; + per_cpu_ptr(chan->local, cpu)->memcpy_count++; + put_cpu(); + + return cookie; +} +EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg); + +/** + * dma_async_memcpy_pg_to_pg - offloaded copy from page to page + * @chan: DMA channel to offload copy to + * @dest_pg: destination page + * @dest_off: offset in page to copy to + * @src_pg: source page + * @src_off: offset in page to copy from + * @len: length + * + * Both @dest_page/@dest_off and @src_page/@src_off must be mappable to a bus + * address according to the DMA mapping API rules for streaming mappings. + * Both @dest_page/@dest_off and @src_page/@src_off must stay memory resident + * (kernel memory or locked user space pages). + */ +dma_cookie_t dma_async_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) +{ + struct dma_device *dev = chan->device; + struct dma_async_tx_descriptor *tx; + dma_addr_t addr; + dma_cookie_t cookie; + int cpu; + + tx = dev->device_prep_dma_memcpy(chan, len, 0); + if (!tx) + return -ENOMEM; + + tx->ack = 1; + tx->callback = NULL; + addr = dma_map_page(dev->dev, src_pg, src_off, len, DMA_TO_DEVICE); + dev->device_set_src(addr, tx, 0); + addr = dma_map_page(dev->dev, dest_pg, dest_off, len, DMA_FROM_DEVICE); + dev->device_set_dest(addr, tx, 0); + cookie = dev->device_tx_submit(tx); + + cpu = get_cpu(); + per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; + per_cpu_ptr(chan->local, cpu)->memcpy_count++; + put_cpu(); + + return cookie; +} +EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg); + +void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, + struct dma_chan *chan) +{ + tx->chan = chan; + spin_lock_init(&tx->lock); + INIT_LIST_HEAD(&tx->depend_node); + INIT_LIST_HEAD(&tx->depend_list); +} +EXPORT_SYMBOL(dma_async_tx_descriptor_init); + static int __init dma_bus_init(void) { mutex_init(&dma_list_mutex); diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c index 8e87261..343013d 100644 --- a/drivers/dma/ioatdma.c +++ b/drivers/dma/ioatdma.c @@ -39,6 +39,7 @@ #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) +#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx) /* internal functions */ static int __devinit ioat_probe(struct pci_dev *pdev, const struct pci_device_id *ent); @@ -99,6 +100,8 @@ static struct ioat_desc_sw *ioat_dma_alloc_descriptor( } memset(desc, 0, sizeof(*desc)); + dma_async_tx_descriptor_init(&desc_sw->async_tx, &ioat_chan->common); + INIT_LIST_HEAD(&desc_sw->group_list); desc_sw->hw = desc; desc_sw->phys = phys; @@ -215,45 +218,25 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan) ioatdma_chan_write16(ioat_chan, IOAT_CHANCTRL_OFFSET, chanctrl); } -/** - * do_ioat_dma_memcpy - actual function that initiates a IOAT DMA transaction - * @ioat_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) +static struct dma_async_tx_descriptor * +ioat_dma_prep_memcpy(struct dma_chan *chan, size_t len, int int_en) { - struct ioat_desc_sw *first; - struct ioat_desc_sw *prev; - struct ioat_desc_sw *new; - dma_cookie_t cookie; + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_desc_sw *first, *prev, *new; 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; + int desc_count = 0; if (!len) - return ioat_chan->common.cookie; + return NULL; 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); @@ -270,9 +253,8 @@ static dma_cookie_t do_ioat_dma_memcpy(struct ioat_dma_chan *ioat_chan, new->hw->size = copy; new->hw->ctl = 0; - new->hw->src_addr = src; - new->hw->dst_addr = dest; - new->cookie = 0; + new->async_tx.cookie = 0; + new->async_tx.ack = 1; /* chain together the physical address list for the HW */ if (!first) @@ -281,129 +263,90 @@ static dma_cookie_t do_ioat_dma_memcpy(struct ioat_dma_chan *ioat_chan, 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 */ + list_splice(&new_chain, &new->group_list); - cookie = ioat_chan->common.cookie; - cookie++; - if (cookie < 0) - cookie = 1; - ioat_chan->common.cookie = new->cookie = cookie; + new->hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS; + new->hw->next = 0; + new->group_count = desc_count; + new->async_tx.ack = 0; /* client is in control of this ack */ + new->async_tx.cookie = -EBUSY; + new->async_tx.type = DMA_MEMCPY; - 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; + return new ? &new->async_tx : NULL; } -/** - * 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) +static void +ioat_set_src(dma_addr_t addr, struct dma_async_tx_descriptor *tx, int index) { - dma_addr_t dest_addr; - dma_addr_t src_addr; - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx); + struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->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); + pci_unmap_addr_set(desc, src, addr); - return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len); -} + list_for_each_entry(iter, &desc->group_list, node) { + iter->hw->src_addr = addr; + addr += ioat_chan->xfercap; + } -/** - * 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) +static void +ioat_set_dest(dma_addr_t addr, struct dma_async_tx_descriptor *tx, int index) { - dma_addr_t dest_addr; - dma_addr_t src_addr; - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx); + struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->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); + pci_unmap_addr_set(desc, dst, addr); - return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len); + list_for_each_entry(iter, &desc->group_list, node) { + iter->hw->dst_addr = addr; + addr += ioat_chan->xfercap; + } } -/** - * 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 not to 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) +static dma_cookie_t +ioat_tx_submit(struct dma_async_tx_descriptor *tx) { - dma_addr_t dest_addr; - dma_addr_t src_addr; - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); + struct ioat_desc_sw *desc = tx_to_ioat_desc(tx); + struct ioat_desc_sw *group_start = list_entry(desc->group_list.next, + struct ioat_desc_sw, node); + int append = 0; + dma_cookie_t cookie; + + spin_lock_bh(&ioat_chan->desc_lock); + /* 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 = desc->async_tx.cookie = cookie; - 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); + /* write address into NextDescriptor field of last desc in chain */ + to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = group_start->phys; + list_splice_init(&desc->group_list, ioat_chan->used_desc.prev); + + ioat_chan->pending += desc->group_count; + if (ioat_chan->pending >= 20) { + append = 1; + ioat_chan->pending = 0; + } + spin_unlock_bh(&ioat_chan->desc_lock); - return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len); + if (append) + ioatdma_chan_write8(ioat_chan, + IOAT_CHANCMD_OFFSET, + IOAT_CHANCMD_APPEND); + return cookie; } /** @@ -467,8 +410,8 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *chan) * exceeding xfercap, perhaps. If so, only the last one will * have a cookie, and require unmapping. */ - if (desc->cookie) { - cookie = desc->cookie; + if (desc->async_tx.cookie) { + cookie = desc->async_tx.cookie; /* yes we are unmapping both _page and _single alloc'd regions with unmap_page. Is this *really* that bad? @@ -484,13 +427,18 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *chan) } 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); + /* a completed entry, but not the last, so cleanup + * if the client is done with the descriptor + */ + if (desc->async_tx.ack) { + list_del(&desc->node); + list_add_tail(&desc->node, &chan->free_desc); + } else + desc->async_tx.cookie = 0; } 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; + desc->async_tx.cookie = 0; /* TODO check status bits? */ break; @@ -506,6 +454,17 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *chan) spin_unlock(&chan->cleanup_lock); } +static void ioat_dma_dependency_added(struct dma_chan *chan) +{ + struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); + spin_lock_bh(&ioat_chan->desc_lock); + if (ioat_chan->pending == 0) { + spin_unlock_bh(&ioat_chan->desc_lock); + ioat_dma_memcpy_cleanup(ioat_chan); + } else + spin_unlock_bh(&ioat_chan->desc_lock); +} + /** * ioat_dma_is_complete - poll the status of a IOAT DMA transaction * @chan: IOAT DMA channel handle @@ -607,6 +566,7 @@ static void ioat_start_null_desc(struct ioat_dma_chan *ioat_chan) desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL; desc->hw->next = 0; + desc->async_tx.ack = 1; list_add_tail(&desc->node, &ioat_chan->used_desc); spin_unlock_bh(&ioat_chan->desc_lock); @@ -633,6 +593,8 @@ static int ioat_self_test(struct ioat_device *device) u8 *src; u8 *dest; struct dma_chan *dma_chan; + struct dma_async_tx_descriptor *tx; + dma_addr_t addr; dma_cookie_t cookie; int err = 0; @@ -658,7 +620,13 @@ static int ioat_self_test(struct ioat_device *device) goto out; } - cookie = ioat_dma_memcpy_buf_to_buf(dma_chan, dest, src, IOAT_TEST_SIZE); + tx = ioat_dma_prep_memcpy(dma_chan, IOAT_TEST_SIZE, 0); + async_tx_ack(tx); + addr = dma_map_single(dma_chan->device->dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE); + ioat_set_src(addr, tx, 0); + addr = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); + ioat_set_dest(addr, tx, 0); + cookie = ioat_tx_submit(tx); ioat_dma_memcpy_issue_pending(dma_chan); msleep(1); @@ -754,13 +722,17 @@ static int __devinit ioat_probe(struct pci_dev *pdev, INIT_LIST_HEAD(&device->common.channels); enumerate_dma_channels(device); + dma_cap_set(DMA_MEMCPY, device->common.cap_mask); 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; + device->common.device_prep_dma_memcpy = ioat_dma_prep_memcpy; + device->common.device_set_src = ioat_set_src; + device->common.device_set_dest = ioat_set_dest; + device->common.device_is_tx_complete = ioat_dma_is_complete; + device->common.device_issue_pending = ioat_dma_memcpy_issue_pending; + device->common.device_dependency_added = ioat_dma_dependency_added; + device->common.device_tx_submit = ioat_tx_submit; + device->common.dev = &pdev->dev; printk(KERN_INFO "Intel(R) I/OAT DMA Engine found, %d channels\n", device->common.chancnt); diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h index 62b26a9..fed259a 100644 --- a/drivers/dma/ioatdma.h +++ b/drivers/dma/ioatdma.h @@ -105,15 +105,20 @@ struct ioat_dma_chan { /** * struct ioat_desc_sw - wrapper around hardware descriptor * @hw: hardware DMA descriptor + * @async_tx: * @node: + * @group_list: + * @group_cnt: * @cookie: * @phys: */ struct ioat_desc_sw { struct ioat_dma_descriptor *hw; + struct dma_async_tx_descriptor async_tx; struct list_head node; - dma_cookie_t cookie; + struct list_head group_list; + int group_count; dma_addr_t phys; DECLARE_PCI_UNMAP_ADDR(src) DECLARE_PCI_UNMAP_LEN(src_len) @@ -122,4 +127,3 @@ struct ioat_desc_sw { }; #endif /* IOATDMA_H */ - diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index c94d8f1..c62d63d 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -21,13 +21,12 @@ #ifndef DMAENGINE_H #define DMAENGINE_H -#ifdef CONFIG_DMA_ENGINE - #include #include #include #include #include +#include /** * enum dma_event - resource PNP/power managment events @@ -65,6 +64,46 @@ enum dma_status { }; /** + * enum dma_transaction_type - DMA transaction types/indexes + */ +enum dma_transaction_type { + DMA_MEMCPY, + DMA_XOR, + DMA_PQ_XOR, + DMA_DUAL_XOR, + DMA_PQ_UPDATE, + DMA_ZERO_SUM, + DMA_PQ_ZERO_SUM, + DMA_MEMSET, + DMA_MEMCPY_CRC32C, + DMA_INTERRUPT, /* when updating, make this the last entry and + * update the DMA_TX_ARRAY_INIT macro + */ +}; + +/* last transaction type for creation of the capabilities mask */ +#define DMA_TX_TYPE_END (DMA_INTERRUPT + 1) + +/* helper macro for clients defining transaction arrays */ +#define DMA_TX_ARRAY_INIT(x) \ + [DMA_MEMCPY] = x, \ + [DMA_XOR] = x, \ + [DMA_PQ_XOR] = x, \ + [DMA_DUAL_XOR] = x, \ + [DMA_PQ_UPDATE] = x, \ + [DMA_ZERO_SUM] = x, \ + [DMA_PQ_ZERO_SUM] = x, \ + [DMA_MEMSET] = x, \ + [DMA_MEMCPY_CRC32C] = x,\ + [DMA_INTERRUPT] = x, + +/** + * dma_cap_mask_t - capabilities bitmap modeled after cpumask_t. + * See linux/cpumask.h + */ +typedef struct { DECLARE_BITMAP(bits, DMA_TX_TYPE_END); } dma_cap_mask_t; + +/** * struct dma_chan_percpu - the per-CPU part of struct dma_chan * @refcount: local_t used for open-coded "bigref" counting * @memcpy_count: transaction counter @@ -157,48 +196,101 @@ struct dma_client { struct list_head global_node; }; +typedef void (*dma_async_tx_callback)(void *dma_async_param); +/** + * struct dma_async_tx_descriptor - async transaction descriptor + * @cookie: tracking cookie for this transaction, set to -EBUSY if + * this tx is sitting on a dependency list + * @ack: the descriptor can not be reused until the client acknowledges + * receipt, i.e. has has a chance to establish any dependency chains + * @type: allows backend implementations to key off the tx_type + * @callback: routine to call after this operation is complete + * @callback_param: general parameter to pass to the callback routine + * @chan: target channel for this operation + * @depend_list: at completion this list of transactions are submitted + * @depend_node: allow this transaction to be executed after another + * transaction has completed + * @parent: pointer to the next level up in the dependency chain + * @lock: protect the dependency list + */ +struct dma_async_tx_descriptor { + dma_cookie_t cookie; + int ack; + enum dma_transaction_type type; + dma_async_tx_callback callback; + void *callback_param; + struct dma_chan *chan; + struct list_head depend_list; + struct list_head depend_node; + struct dma_async_tx_descriptor *parent; + spinlock_t lock; +}; + /** * struct dma_device - info on the entity supplying DMA services * @chancnt: how many DMA channels are supported * @channels: the list of struct dma_chan * @global_node: list_head for global dma_device_list + * @cap_mask: one or more dma_capability flags + * @max_xor: maximum number of xor sources, 0 if no capability * @refcount: reference count * @done: IO completion struct * @dev_id: unique device ID + * @dev: struct device reference for dma mapping api * @device_alloc_chan_resources: allocate resources and return the * number of allocated descriptors * @device_free_chan_resources: release DMA channel's resources - * @device_memcpy_buf_to_buf: memcpy buf pointer to buf pointer - * @device_memcpy_buf_to_pg: memcpy buf pointer to struct page - * @device_memcpy_pg_to_pg: memcpy struct page/offset to struct page/offset - * @device_memcpy_complete: poll the status of an IOAT DMA transaction - * @device_memcpy_issue_pending: push appended descriptors to hardware + * @device_prep_dma_memcpy: prepares a memcpy operation + * @device_prep_dma_xor: prepares a xor operation + * @device_prep_dma_zero_sum: prepares a zero_sum operation + * @device_prep_dma_memset: prepares a memset operation + * @device_prep_dma_interrupt: prepares an end of chain interrupt operation + * @device_tx_submit: execute an operation + * @device_set_dest: set a destination address in a hardware descriptor + * @device_set_src: set a source address in a hardware descriptor + * @device_dependency_added: async_tx notifies the channel about new deps + * @device_issue_pending: push pending transactions to hardware */ struct dma_device { unsigned int chancnt; struct list_head channels; struct list_head global_node; + dma_cap_mask_t cap_mask; + int max_xor; struct kref refcount; struct completion done; int dev_id; + struct device *dev; int (*device_alloc_chan_resources)(struct dma_chan *chan); void (*device_free_chan_resources)(struct dma_chan *chan); - dma_cookie_t (*device_memcpy_buf_to_buf)(struct dma_chan *chan, - void *dest, void *src, size_t len); - dma_cookie_t (*device_memcpy_buf_to_pg)(struct dma_chan *chan, - struct page *page, unsigned int offset, void *kdata, - size_t len); - dma_cookie_t (*device_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); - enum dma_status (*device_memcpy_complete)(struct dma_chan *chan, + + struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)( + struct dma_chan *chan, size_t len, int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_xor)( + struct dma_chan *chan, unsigned int src_cnt, size_t len, + int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)( + struct dma_chan *chan, unsigned int src_cnt, size_t len, + u32 *result, int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_memset)( + struct dma_chan *chan, int value, size_t len, int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)( + struct dma_chan *chan); + + dma_cookie_t (*device_tx_submit)(struct dma_async_tx_descriptor *tx); + void (*device_set_dest)(dma_addr_t addr, + struct dma_async_tx_descriptor *tx, int index); + void (*device_set_src)(dma_addr_t addr, + struct dma_async_tx_descriptor *tx, int index); + void (*device_dependency_added)(struct dma_chan *chan); + enum dma_status (*device_is_tx_complete)(struct dma_chan *chan, dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used); - void (*device_memcpy_issue_pending)(struct dma_chan *chan); + void (*device_issue_pending)(struct dma_chan *chan); }; /* --- public DMA engine API --- */ @@ -207,96 +299,68 @@ struct dma_client *dma_async_client_register(dma_event_callback event_callback); void dma_async_client_unregister(struct dma_client *client); void dma_async_client_chan_request(struct dma_client *client, unsigned int number); - -/** - * dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses - * @chan: DMA channel to offload copy to - * @dest: destination address (virtual) - * @src: source address (virtual) - * @len: length - * - * Both @dest and @src must be mappable to a bus address according to the - * DMA mapping API rules for streaming mappings. - * Both @dest and @src must stay memory resident (kernel memory or locked - * user space pages). - */ -static inline dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan, - void *dest, void *src, size_t len) +dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan, + void *dest, void *src, size_t len); +dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan, + struct page *page, unsigned int offset, void *kdata, size_t len); +dma_cookie_t dma_async_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); +void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, + struct dma_chan *chan); + + +static inline void +async_tx_ack(struct dma_async_tx_descriptor *tx) { - int cpu = get_cpu(); - per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; - per_cpu_ptr(chan->local, cpu)->memcpy_count++; - put_cpu(); - - return chan->device->device_memcpy_buf_to_buf(chan, dest, src, len); + tx->ack = 1; } -/** - * dma_async_memcpy_buf_to_pg - offloaded copy from address to page - * @chan: DMA channel to offload copy to - * @page: destination page - * @offset: offset in page to copy to - * @kdata: source address (virtual) - * @len: length - * - * Both @page/@offset and @kdata must be mappable to a bus address according - * to the DMA mapping API rules for streaming mappings. - * Both @page/@offset and @kdata must stay memory resident (kernel memory or - * locked user space pages) - */ -static inline dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan, - struct page *page, unsigned int offset, void *kdata, size_t len) +#define first_dma_cap(mask) __first_dma_cap(&(mask)) +static inline int __first_dma_cap(const dma_cap_mask_t *srcp) { - int cpu = get_cpu(); - per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; - per_cpu_ptr(chan->local, cpu)->memcpy_count++; - put_cpu(); + return min_t(int, DMA_TX_TYPE_END, find_first_bit(srcp->bits, DMA_TX_TYPE_END)); +} - return chan->device->device_memcpy_buf_to_pg(chan, page, offset, - kdata, len); +#define next_dma_cap(n, mask) __next_dma_cap((n), &(mask)) +static inline int __next_dma_cap(int n, const dma_cap_mask_t *srcp) +{ + return min_t(int, DMA_TX_TYPE_END, find_next_bit(srcp->bits, DMA_TX_TYPE_END, n+1)); } -/** - * dma_async_memcpy_pg_to_pg - offloaded copy from page to page - * @chan: DMA channel to offload copy to - * @dest_pg: destination page - * @dest_off: offset in page to copy to - * @src_pg: source page - * @src_off: offset in page to copy from - * @len: length - * - * Both @dest_page/@dest_off and @src_page/@src_off must be mappable to a bus - * address according to the DMA mapping API rules for streaming mappings. - * Both @dest_page/@dest_off and @src_page/@src_off must stay memory resident - * (kernel memory or locked user space pages). - */ -static inline dma_cookie_t dma_async_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) +#define dma_cap_set(tx, mask) __dma_cap_set((tx), &(mask)) +static inline void __dma_cap_set(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp) { - int cpu = get_cpu(); - per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; - per_cpu_ptr(chan->local, cpu)->memcpy_count++; - put_cpu(); + set_bit(tx_type, dstp->bits); +} - return chan->device->device_memcpy_pg_to_pg(chan, dest_pg, dest_off, - src_pg, src_off, len); +#define dma_has_cap(tx, mask) __dma_has_cap((tx), &(mask)) +static inline int __dma_has_cap(enum dma_transaction_type tx_type, dma_cap_mask_t *srcp) +{ + return test_bit(tx_type, srcp->bits); } +#define for_each_dma_cap_mask(cap, mask) \ + for ((cap) = first_dma_cap(mask); \ + (cap) < DMA_TX_TYPE_END; \ + (cap) = next_dma_cap((cap), (mask))) + /** - * dma_async_memcpy_issue_pending - flush pending copies to HW + * dma_async_issue_pending - flush pending transactions to HW * @chan: target DMA channel * * This allows drivers to push copies to HW in batches, * reducing MMIO writes where possible. */ -static inline void dma_async_memcpy_issue_pending(struct dma_chan *chan) +static inline void dma_async_issue_pending(struct dma_chan *chan) { - return chan->device->device_memcpy_issue_pending(chan); + return chan->device->device_issue_pending(chan); } +#define dma_async_memcpy_issue_pending(chan) dma_async_issue_pending(chan) + /** - * dma_async_memcpy_complete - poll for transaction completion + * dma_async_is_tx_complete - poll for transaction completion * @chan: DMA channel * @cookie: transaction identifier to check status of * @last: returns last completed cookie, can be NULL @@ -306,12 +370,15 @@ static inline void dma_async_memcpy_issue_pending(struct dma_chan *chan) * internal state and can be used with dma_async_is_complete() to check * the status of multiple cookies without re-checking hardware state. */ -static inline enum dma_status dma_async_memcpy_complete(struct dma_chan *chan, +static inline enum dma_status dma_async_is_tx_complete(struct dma_chan *chan, dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used) { - return chan->device->device_memcpy_complete(chan, cookie, last, used); + return chan->device->device_is_tx_complete(chan, cookie, last, used); } +#define dma_async_memcpy_complete(chan, cookie, last, used)\ + dma_async_is_tx_complete(chan, cookie, last, used) + /** * dma_async_is_complete - test a cookie against chan state * @cookie: transaction identifier to test status of @@ -334,6 +401,7 @@ static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie, return DMA_IN_PROGRESS; } +enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie); /* --- DMA device --- */ @@ -362,5 +430,4 @@ dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov, struct dma_pinned_list *pinned_list, struct page *page, unsigned int offset, size_t len); -#endif /* CONFIG_DMA_ENGINE */ #endif /* DMAENGINE_H */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/