From: Sanjay R Mehta <[email protected]> This Registers the ptdma to Linux dmaengine framework as general purpose DMA channels.
Signed-off-by: Sanjay R Mehta <[email protected]> Reviewed-by: Shyam Sundar S K <[email protected]> Reviewed-by: Rajesh Kumar <[email protected]> --- drivers/dma/ptdma/Kconfig | 1 + drivers/dma/ptdma/Makefile | 3 +- drivers/dma/ptdma/ptdma-dev.c | 8 + drivers/dma/ptdma/ptdma-dmaengine.c | 700 ++++++++++++++++++++++++++++++++++++ drivers/dma/ptdma/ptdma.h | 43 +++ 5 files changed, 754 insertions(+), 1 deletion(-) create mode 100644 drivers/dma/ptdma/ptdma-dmaengine.c diff --git a/drivers/dma/ptdma/Kconfig b/drivers/dma/ptdma/Kconfig index a373431..3954501 100644 --- a/drivers/dma/ptdma/Kconfig +++ b/drivers/dma/ptdma/Kconfig @@ -3,5 +3,6 @@ config AMD_PTDMA tristate "AMD Passthru DMA Engine" default m depends on X86_64 && PCI + select DMA_ENGINE help Provides the support for AMD Passthru DMA engine. diff --git a/drivers/dma/ptdma/Makefile b/drivers/dma/ptdma/Makefile index a5b4cef..5fc174a 100644 --- a/drivers/dma/ptdma/Makefile +++ b/drivers/dma/ptdma/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_AMD_PTDMA) += ptdma.o ptdma-objs := ptdma-ops.o \ - ptdma-dev.o + ptdma-dev.o \ + ptdma-dmaengine.o ptdma-$(CONFIG_PCI) += ptdma-pci.o diff --git a/drivers/dma/ptdma/ptdma-dev.c b/drivers/dma/ptdma/ptdma-dev.c index e69999b..1a7a982 100644 --- a/drivers/dma/ptdma/ptdma-dev.c +++ b/drivers/dma/ptdma/ptdma-dev.c @@ -357,6 +357,11 @@ int pt_core_init(struct pt_device *pt) /* Put this on the unit list to make it available */ pt_add_device(pt); + /* Register the DMA engine support */ + ret = pt_dmaengine_register(pt); + if (ret) + goto e_kthread; + return 0; @@ -382,6 +387,9 @@ void pt_core_destroy(struct pt_device *pt) struct pt_cmd_queue *cmd_q = &pt->cmd_q; struct pt_cmd *cmd; + /* Unregister the DMA engine */ + pt_dmaengine_unregister(pt); + /* Remove this device from the list of available units first */ pt_del_device(pt); diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-dmaengine.c new file mode 100644 index 0000000..265cdaa --- /dev/null +++ b/drivers/dma/ptdma/ptdma-dmaengine.c @@ -0,0 +1,700 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AMD Passthrough DMA device driver + * + * Copyright (C) 2019 Advanced Micro Devices, Inc. + * + * Author: Sanjay R Mehta <[email protected]> + * + * Based on CCP driver + * Original copyright message: + * + * Copyright (C) 2016,2017 Advanced Micro Devices, Inc. + * + * Author: Gary R Hook <[email protected]> + */ + +#include "ptdma.h" +#include "../dmaengine.h" + +#define PT_DMA_WIDTH(_mask) \ +({ \ + u64 mask = _mask + 1; \ + (mask == 0) ? 64 : fls64(mask); \ +}) + +static void pt_free_cmd_resources(struct pt_device *pt, + struct list_head *list) +{ + struct pt_dma_cmd *cmd, *ctmp; + + list_for_each_entry_safe(cmd, ctmp, list, entry) { + list_del(&cmd->entry); + kmem_cache_free(pt->dma_cmd_cache, cmd); + } +} + +static void pt_free_desc_resources(struct pt_device *pt, + struct list_head *list) +{ + struct pt_dma_desc *desc, *dtmp; + + list_for_each_entry_safe(desc, dtmp, list, entry) { + pt_free_cmd_resources(pt, &desc->active); + pt_free_cmd_resources(pt, &desc->pending); + + list_del(&desc->entry); + kmem_cache_free(pt->dma_desc_cache, desc); + } +} + +static void pt_free_chan_resources(struct dma_chan *dma_chan) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + unsigned long flags; + + dev_dbg(chan->pt->dev, "%s - chan=%p\n", __func__, chan); + + spin_lock_irqsave(&chan->lock, flags); + + pt_free_desc_resources(chan->pt, &chan->complete); + pt_free_desc_resources(chan->pt, &chan->active); + pt_free_desc_resources(chan->pt, &chan->pending); + pt_free_desc_resources(chan->pt, &chan->created); + + spin_unlock_irqrestore(&chan->lock, flags); +} + +static void pt_cleanup_desc_resources(struct pt_device *pt, + struct list_head *list) +{ + struct pt_dma_desc *desc, *dtmp; + + list_for_each_entry_safe_reverse(desc, dtmp, list, entry) { + if (!async_tx_test_ack(&desc->tx_desc)) + continue; + + dev_dbg(pt->dev, "%s - desc=%p\n", __func__, desc); + + pt_free_cmd_resources(pt, &desc->active); + pt_free_cmd_resources(pt, &desc->pending); + + list_del(&desc->entry); + kmem_cache_free(pt->dma_desc_cache, desc); + } +} + +static void pt_do_cleanup(unsigned long data) +{ + struct pt_dma_chan *chan = (struct pt_dma_chan *)data; + unsigned long flags; + + dev_dbg(chan->pt->dev, "%s - chan=%s\n", __func__, + dma_chan_name(&chan->dma_chan)); + + spin_lock_irqsave(&chan->lock, flags); + + pt_cleanup_desc_resources(chan->pt, &chan->complete); + + spin_unlock_irqrestore(&chan->lock, flags); +} + +static int pt_issue_next_cmd(struct pt_dma_desc *desc) +{ + struct pt_dma_cmd *cmd; + int ret; + + cmd = list_first_entry(&desc->pending, struct pt_dma_cmd, entry); + list_move(&cmd->entry, &desc->active); + + dev_dbg(desc->pt->dev, "%s - tx %d, cmd=%p\n", __func__, + desc->tx_desc.cookie, cmd); + + ret = pt_enqueue_cmd(&cmd->pt_cmd); + if (!ret || (ret == -EINPROGRESS) || (ret == -EBUSY)) + return 0; + + dev_dbg(desc->pt->dev, "%s - error: ret=%d, tx %d, cmd=%p\n", __func__, + ret, desc->tx_desc.cookie, cmd); + + return ret; +} + +static void pt_free_active_cmd(struct pt_dma_desc *desc) +{ + struct pt_dma_cmd *cmd; + + cmd = list_first_entry_or_null(&desc->active, struct pt_dma_cmd, + entry); + if (!cmd) + return; + + dev_dbg(desc->pt->dev, "%s - freeing tx %d cmd=%p\n", + __func__, desc->tx_desc.cookie, cmd); + + list_del(&cmd->entry); + kmem_cache_free(desc->pt->dma_cmd_cache, cmd); +} + +static struct pt_dma_desc *__pt_next_dma_desc(struct pt_dma_chan *chan, + struct pt_dma_desc *desc) +{ + /* Move current DMA descriptor to the complete list */ + if (desc) + list_move(&desc->entry, &chan->complete); + + /* Get the next DMA descriptor on the active list */ + desc = list_first_entry_or_null(&chan->active, struct pt_dma_desc, + entry); + + return desc; +} + +static struct pt_dma_desc *pt_handle_active_desc(struct pt_dma_chan *chan, + struct pt_dma_desc *desc) +{ + struct dma_async_tx_descriptor *tx_desc; + unsigned long flags; + + /* Loop over descriptors until one is found with commands */ + do { + if (desc) { + /* Remove the DMA command from the list and free it */ + pt_free_active_cmd(desc); + + if (!list_empty(&desc->pending)) { + /* No errors, keep going */ + if (desc->status != DMA_ERROR) + return desc; + + /* Error, free remaining commands and move on */ + pt_free_cmd_resources(desc->pt, + &desc->pending); + } + + tx_desc = &desc->tx_desc; + } else { + tx_desc = NULL; + } + + spin_lock_irqsave(&chan->lock, flags); + + if (desc) { + if (desc->status != DMA_ERROR) + desc->status = DMA_COMPLETE; + + dev_dbg(desc->pt->dev, + "%s - tx %d complete, status=%u\n", __func__, + desc->tx_desc.cookie, desc->status); + + dma_cookie_complete(tx_desc); + dma_descriptor_unmap(tx_desc); + } + + desc = __pt_next_dma_desc(chan, desc); + + spin_unlock_irqrestore(&chan->lock, flags); + + if (tx_desc) { + dmaengine_desc_get_callback_invoke(tx_desc, NULL); + + dma_run_dependencies(tx_desc); + } + } while (desc); + + return NULL; +} + +static struct pt_dma_desc *__pt_pending_to_active(struct pt_dma_chan *chan) +{ + struct pt_dma_desc *desc; + + if (list_empty(&chan->pending)) + return NULL; + + desc = list_empty(&chan->active) + ? list_first_entry(&chan->pending, struct pt_dma_desc, entry) + : NULL; + + list_splice_tail_init(&chan->pending, &chan->active); + + return desc; +} + +static void pt_cmd_callback(void *data, int err) +{ + struct pt_dma_desc *desc = data; + struct pt_dma_chan *chan; + int ret; + + if (err == -EINPROGRESS) + return; + + chan = container_of(desc->tx_desc.chan, struct pt_dma_chan, + dma_chan); + + dev_dbg(chan->pt->dev, "%s - tx %d callback, err=%d\n", + __func__, desc->tx_desc.cookie, err); + + if (err) + desc->status = DMA_ERROR; + + while (true) { + /* Check for DMA descriptor completion */ + desc = pt_handle_active_desc(chan, desc); + + /* Don't submit cmd if no descriptor or DMA is paused */ + if (!desc || (chan->status == DMA_PAUSED)) + break; + + ret = pt_issue_next_cmd(desc); + if (!ret) + break; + + desc->status = DMA_ERROR; + } + + tasklet_schedule(&chan->cleanup_tasklet); +} + +static dma_cookie_t pt_tx_submit(struct dma_async_tx_descriptor *tx_desc) +{ + struct pt_dma_desc *desc = container_of(tx_desc, struct pt_dma_desc, + tx_desc); + struct pt_dma_chan *chan; + dma_cookie_t cookie; + unsigned long flags; + + chan = container_of(tx_desc->chan, struct pt_dma_chan, dma_chan); + + spin_lock_irqsave(&chan->lock, flags); + + cookie = dma_cookie_assign(tx_desc); + list_del(&desc->entry); + list_add_tail(&desc->entry, &chan->pending); + + spin_unlock_irqrestore(&chan->lock, flags); + + dev_dbg(chan->pt->dev, "%s - added tx descriptor %d to pending list\n", + __func__, cookie); + + return cookie; +} + +static struct pt_dma_cmd *pt_alloc_dma_cmd(struct pt_dma_chan *chan) +{ + struct pt_dma_cmd *cmd; + + cmd = kmem_cache_zalloc(chan->pt->dma_cmd_cache, GFP_NOWAIT); + + return cmd; +} + +static struct pt_dma_desc *pt_alloc_dma_desc(struct pt_dma_chan *chan, + unsigned long flags) +{ + struct pt_dma_desc *desc; + + desc = kmem_cache_zalloc(chan->pt->dma_desc_cache, GFP_NOWAIT); + if (!desc) + return NULL; + + dma_async_tx_descriptor_init(&desc->tx_desc, &chan->dma_chan); + desc->tx_desc.flags = flags; + desc->tx_desc.tx_submit = pt_tx_submit; + desc->pt = chan->pt; + INIT_LIST_HEAD(&desc->pending); + INIT_LIST_HEAD(&desc->active); + desc->status = DMA_IN_PROGRESS; + + return desc; +} + +static struct pt_dma_desc *pt_create_desc(struct dma_chan *dma_chan, + struct scatterlist *dst_sg, + unsigned int dst_nents, + struct scatterlist *src_sg, + unsigned int src_nents, + unsigned long flags) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + struct pt_device *pt = chan->pt; + struct pt_dma_desc *desc; + struct pt_dma_cmd *cmd; + struct pt_cmd *pt_cmd; + struct pt_passthru_engine *pt_engine; + unsigned int src_offset, src_len; + unsigned int dst_offset, dst_len; + unsigned int len; + unsigned long sflags; + size_t total_len; + + if (!dst_sg || !src_sg) + return NULL; + + if (!dst_nents || !src_nents) + return NULL; + + desc = pt_alloc_dma_desc(chan, flags); + if (!desc) + return NULL; + + total_len = 0; + + src_len = sg_dma_len(src_sg); + src_offset = 0; + + dst_len = sg_dma_len(dst_sg); + dst_offset = 0; + + while (true) { + if (!src_len) { + src_nents--; + if (!src_nents) + break; + + src_sg = sg_next(src_sg); + if (!src_sg) + break; + + src_len = sg_dma_len(src_sg); + src_offset = 0; + continue; + } + + if (!dst_len) { + dst_nents--; + if (!dst_nents) + break; + + dst_sg = sg_next(dst_sg); + if (!dst_sg) + break; + + dst_len = sg_dma_len(dst_sg); + dst_offset = 0; + continue; + } + + len = min(dst_len, src_len); + + cmd = pt_alloc_dma_cmd(chan); + if (!cmd) + goto err; + + pt_cmd = &cmd->pt_cmd; + pt_cmd->pt = chan->pt; + pt_engine = &pt_cmd->passthru; + pt_cmd->flags = PT_CMD_MAY_BACKLOG; + pt_cmd->engine = PT_ENGINE_PASSTHRU; + pt_engine->bit_mod = PT_PASSTHRU_BITWISE_NOOP; + pt_engine->byte_swap = PT_PASSTHRU_BYTESWAP_NOOP; + pt_engine->src_dma = sg_dma_address(src_sg) + src_offset; + pt_engine->dst_dma = sg_dma_address(dst_sg) + dst_offset; + pt_engine->src_len = len; + pt_engine->final = 1; + pt_cmd->callback = pt_cmd_callback; + pt_cmd->data = desc; + + list_add_tail(&cmd->entry, &desc->pending); + + dev_dbg(pt->dev, + "%s - cmd=%p, src=%pad, dst=%pad, len=%llu\n", __func__, + cmd, &pt_engine->src_dma, + &pt_engine->dst_dma, pt_engine->src_len); + + total_len += len; + + src_len -= len; + src_offset += len; + + dst_len -= len; + dst_offset += len; + } + + desc->len = total_len; + + if (list_empty(&desc->pending)) + goto err; + + dev_dbg(pt->dev, "%s - desc=%p\n", __func__, desc); + + spin_lock_irqsave(&chan->lock, sflags); + + list_add_tail(&desc->entry, &chan->created); + + spin_unlock_irqrestore(&chan->lock, sflags); + + return desc; + +err: + pt_free_cmd_resources(pt, &desc->pending); + kmem_cache_free(pt->dma_desc_cache, desc); + + return NULL; +} + +static struct dma_async_tx_descriptor *pt_prep_dma_memcpy( + struct dma_chan *dma_chan, dma_addr_t dst, dma_addr_t src, size_t len, + unsigned long flags) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + struct pt_dma_desc *desc; + struct scatterlist dst_sg, src_sg; + + dev_dbg(chan->pt->dev, + "%s - src=%pad, dst=%pad, len=%zu, flags=%#lx\n", + __func__, &src, &dst, len, flags); + + sg_init_table(&dst_sg, 1); + sg_dma_address(&dst_sg) = dst; + sg_dma_len(&dst_sg) = len; + + sg_init_table(&src_sg, 1); + sg_dma_address(&src_sg) = src; + sg_dma_len(&src_sg) = len; + + desc = pt_create_desc(dma_chan, &dst_sg, 1, &src_sg, 1, flags); + if (!desc) + return NULL; + + return &desc->tx_desc; +} + +static struct dma_async_tx_descriptor *pt_prep_dma_interrupt( + struct dma_chan *dma_chan, unsigned long flags) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + struct pt_dma_desc *desc; + + desc = pt_alloc_dma_desc(chan, flags); + if (!desc) + return NULL; + + return &desc->tx_desc; +} + +static void pt_issue_pending(struct dma_chan *dma_chan) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + struct pt_dma_desc *desc; + unsigned long flags; + + dev_dbg(chan->pt->dev, "%s\n", __func__); + + spin_lock_irqsave(&chan->lock, flags); + + desc = __pt_pending_to_active(chan); + + spin_unlock_irqrestore(&chan->lock, flags); + + /* If there was nothing active, start processing */ + if (desc) + pt_cmd_callback(desc, 0); +} + +static enum dma_status pt_tx_status(struct dma_chan *dma_chan, + dma_cookie_t cookie, + struct dma_tx_state *state) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + struct pt_dma_desc *desc; + enum dma_status ret; + unsigned long flags; + + if (chan->status == DMA_PAUSED) { + ret = DMA_PAUSED; + goto out; + } + + ret = dma_cookie_status(dma_chan, cookie, state); + if (ret == DMA_COMPLETE) { + spin_lock_irqsave(&chan->lock, flags); + + /* Get status from complete chain, if still there */ + list_for_each_entry(desc, &chan->complete, entry) { + if (desc->tx_desc.cookie != cookie) + continue; + + ret = desc->status; + break; + } + + spin_unlock_irqrestore(&chan->lock, flags); + } + +out: + dev_dbg(chan->pt->dev, "%s - %u\n", __func__, ret); + + return ret; +} + +static int pt_pause(struct dma_chan *dma_chan) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + + chan->status = DMA_PAUSED; + + /*TODO: Wait for active DMA to complete before returning? */ + + return 0; +} + +static int pt_resume(struct dma_chan *dma_chan) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + struct pt_dma_desc *desc; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + + desc = list_first_entry_or_null(&chan->active, struct pt_dma_desc, + entry); + + spin_unlock_irqrestore(&chan->lock, flags); + + /* Indicate the channel is running again */ + chan->status = DMA_IN_PROGRESS; + + /* If there was something active, re-start */ + if (desc) + pt_cmd_callback(desc, 0); + + return 0; +} + +static int pt_terminate_all(struct dma_chan *dma_chan) +{ + struct pt_dma_chan *chan = container_of(dma_chan, struct pt_dma_chan, + dma_chan); + unsigned long flags; + + dev_dbg(chan->pt->dev, "%s\n", __func__); + + spin_lock_irqsave(&chan->lock, flags); + + pt_free_desc_resources(chan->pt, &chan->active); + pt_free_desc_resources(chan->pt, &chan->pending); + pt_free_desc_resources(chan->pt, &chan->created); + + spin_unlock_irqrestore(&chan->lock, flags); + + return 0; +} + +int pt_dmaengine_register(struct pt_device *pt) +{ + struct pt_dma_chan *chan; + struct dma_device *dma_dev = &pt->dma_dev; + struct dma_chan *dma_chan; + char *dma_cmd_cache_name; + char *dma_desc_cache_name; + int ret; + + pt->pt_dma_chan = devm_kcalloc(pt->dev, 1, + sizeof(*(pt->pt_dma_chan)), + GFP_KERNEL); + if (!pt->pt_dma_chan) + return -ENOMEM; + + dma_cmd_cache_name = devm_kasprintf(pt->dev, GFP_KERNEL, + "%s-dmaengine-cmd-cache", + pt->name); + if (!dma_cmd_cache_name) + return -ENOMEM; + + pt->dma_cmd_cache = kmem_cache_create(dma_cmd_cache_name, + sizeof(struct pt_dma_cmd), + sizeof(void *), + SLAB_HWCACHE_ALIGN, NULL); + if (!pt->dma_cmd_cache) + return -ENOMEM; + + dma_desc_cache_name = devm_kasprintf(pt->dev, GFP_KERNEL, + "%s-dmaengine-desc-cache", + pt->name); + if (!dma_desc_cache_name) { + ret = -ENOMEM; + goto err_cache; + } + + pt->dma_desc_cache = kmem_cache_create(dma_desc_cache_name, + sizeof(struct pt_dma_desc), + sizeof(void *), + SLAB_HWCACHE_ALIGN, NULL); + if (!pt->dma_desc_cache) { + ret = -ENOMEM; + goto err_cache; + } + + dma_dev->dev = pt->dev; + dma_dev->src_addr_widths = PT_DMA_WIDTH(dma_get_mask(pt->dev)); + dma_dev->dst_addr_widths = PT_DMA_WIDTH(dma_get_mask(pt->dev)); + dma_dev->directions = DMA_MEM_TO_MEM; + dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask); + dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask); + + INIT_LIST_HEAD(&dma_dev->channels); + + chan = pt->pt_dma_chan; + dma_chan = &chan->dma_chan; + + chan->pt = pt; + + spin_lock_init(&chan->lock); + INIT_LIST_HEAD(&chan->created); + INIT_LIST_HEAD(&chan->pending); + INIT_LIST_HEAD(&chan->active); + INIT_LIST_HEAD(&chan->complete); + + tasklet_init(&chan->cleanup_tasklet, pt_do_cleanup, + (unsigned long)chan); + + dma_chan->device = dma_dev; + dma_cookie_init(dma_chan); + + list_add_tail(&dma_chan->device_node, &dma_dev->channels); + + dma_dev->device_free_chan_resources = pt_free_chan_resources; + dma_dev->device_prep_dma_memcpy = pt_prep_dma_memcpy; + dma_dev->device_prep_dma_interrupt = pt_prep_dma_interrupt; + dma_dev->device_issue_pending = pt_issue_pending; + dma_dev->device_tx_status = pt_tx_status; + dma_dev->device_pause = pt_pause; + dma_dev->device_resume = pt_resume; + dma_dev->device_terminate_all = pt_terminate_all; + + ret = dma_async_device_register(dma_dev); + if (ret) + goto err_reg; + + return 0; + +err_reg: + kmem_cache_destroy(pt->dma_desc_cache); + +err_cache: + kmem_cache_destroy(pt->dma_cmd_cache); + + return ret; +} + +void pt_dmaengine_unregister(struct pt_device *pt) +{ + struct dma_device *dma_dev = &pt->dma_dev; + + dma_async_device_unregister(dma_dev); + + kmem_cache_destroy(pt->dma_desc_cache); + kmem_cache_destroy(pt->dma_cmd_cache); +} diff --git a/drivers/dma/ptdma/ptdma.h b/drivers/dma/ptdma/ptdma.h index 4e89517..e8bb4e7 100644 --- a/drivers/dma/ptdma/ptdma.h +++ b/drivers/dma/ptdma/ptdma.h @@ -25,6 +25,7 @@ #include <linux/list.h> #include <linux/wait.h> #include <linux/dmapool.h> +#include <linux/dmaengine.h> #define MAX_PT_NAME_LEN 16 #define MAX_DMAPOOL_NAME_LEN 32 @@ -227,6 +228,39 @@ struct pt_cmd { void *data; }; +struct pt_dma_cmd { + struct list_head entry; + struct pt_cmd pt_cmd; +}; + +struct pt_dma_desc { + struct list_head entry; + + struct pt_device *pt; + + struct list_head pending; + struct list_head active; + + enum dma_status status; + struct dma_async_tx_descriptor tx_desc; + size_t len; +}; + +struct pt_dma_chan { + struct pt_device *pt; + + spinlock_t lock; + struct list_head created; + struct list_head pending; + struct list_head active; + struct list_head complete; + + struct tasklet_struct cleanup_tasklet; + + enum dma_status status; + struct dma_chan dma_chan; +}; + struct pt_cmd_queue { struct pt_device *pt; @@ -310,6 +344,12 @@ struct pt_device { */ struct pt_cmd_queue cmd_q; + /* Support for the DMA Engine capabilities */ + struct dma_device dma_dev; + struct pt_dma_chan *pt_dma_chan; + struct kmem_cache *dma_cmd_cache; + struct kmem_cache *dma_desc_cache; + wait_queue_head_t lsb_queue; unsigned int lsb_count; u32 lsb_start; @@ -460,6 +500,9 @@ int pt_cmd_queue_thread(void *data); int pt_run_cmd(struct pt_cmd_queue *cmd_q, struct pt_cmd *cmd); +int pt_dmaengine_register(struct pt_device *pt); +void pt_dmaengine_unregister(struct pt_device *pt); + int pt_core_init(struct pt_device *pt); void pt_core_destroy(struct pt_device *pt); -- 2.7.4
