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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/dmaengine.h>
#include <uapi/linux/idxd.h>
#include "../dmaengine.h"
#include "registers.h"
#include "idxd.h"
static inline struct idxd_wq *to_idxd_wq(struct dma_chan *c)
{
struct idxd_dma_chan *idxd_chan;
idxd_chan = container_of(c, struct idxd_dma_chan, chan);
return idxd_chan->wq;
}
void idxd_dma_complete_txd(struct idxd_desc *desc,
enum idxd_complete_type comp_type,
bool free_desc)
{
struct idxd_device *idxd = desc->wq->idxd;
struct dma_async_tx_descriptor *tx;
struct dmaengine_result res;
int complete = 1;
if (desc->completion->status == DSA_COMP_SUCCESS) {
res.result = DMA_TRANS_NOERROR;
} else if (desc->completion->status) {
if (idxd->request_int_handles && comp_type != IDXD_COMPLETE_ABORT &&
desc->completion->status == DSA_COMP_INT_HANDLE_INVAL &&
idxd_queue_int_handle_resubmit(desc))
return;
res.result = DMA_TRANS_WRITE_FAILED;
} else if (comp_type == IDXD_COMPLETE_ABORT) {
res.result = DMA_TRANS_ABORTED;
} else {
complete = 0;
}
tx = &desc->txd;
if (complete && tx->cookie) {
dma_cookie_complete(tx);
dma_descriptor_unmap(tx);
dmaengine_desc_get_callback_invoke(tx, &res);
tx->callback = NULL;
tx->callback_result = NULL;
}
if (free_desc)
idxd_free_desc(desc->wq, desc);
}
static void op_flag_setup(unsigned long flags, u32 *desc_flags)
{
*desc_flags = IDXD_OP_FLAG_CRAV | IDXD_OP_FLAG_RCR;
if (flags & DMA_PREP_INTERRUPT)
*desc_flags |= IDXD_OP_FLAG_RCI;
}
static inline void set_completion_address(struct idxd_desc *desc,
u64 *compl_addr)
{
*compl_addr = desc->compl_dma;
}
static inline void idxd_prep_desc_common(struct idxd_wq *wq,
struct dsa_hw_desc *hw, char opcode,
u64 addr_f1, u64 addr_f2, u64 len,
u64 compl, u32 flags)
{
hw->flags = flags;
hw->opcode = opcode;
hw->src_addr = addr_f1;
hw->dst_addr = addr_f2;
hw->xfer_size = len;
/*
* For dedicated WQ, this field is ignored and HW will use the WQCFG.priv
* field instead. This field should be set to 1 for kernel descriptors.
*/
hw->priv = 1;
hw->completion_addr = compl;
}
static struct dma_async_tx_descriptor *
idxd_dma_submit_memcpy(struct dma_chan *c, dma_addr_t dma_dest,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct idxd_wq *wq = to_idxd_wq(c);
u32 desc_flags;
struct idxd_device *idxd = wq->idxd;
struct idxd_desc *desc;
if (wq->state != IDXD_WQ_ENABLED)
return NULL;
if (len > idxd->max_xfer_bytes)
return NULL;
op_flag_setup(flags, &desc_flags);
desc = idxd_alloc_desc(wq, IDXD_OP_BLOCK);
if (IS_ERR(desc))
return NULL;
idxd_prep_desc_common(wq, desc->hw, DSA_OPCODE_MEMMOVE,
dma_src, dma_dest, len, desc->compl_dma,
desc_flags);
desc->txd.flags = flags;
return &desc->txd;
}
static int idxd_dma_alloc_chan_resources(struct dma_chan *chan)
{
struct idxd_wq *wq = to_idxd_wq(chan);
struct device *dev = &wq->idxd->pdev->dev;
idxd_wq_get(wq);
dev_dbg(dev, "%s: client_count: %d\n", __func__,
idxd_wq_refcount(wq));
return 0;
}
static void idxd_dma_free_chan_resources(struct dma_chan *chan)
{
struct idxd_wq *wq = to_idxd_wq(chan);
struct device *dev = &wq->idxd->pdev->dev;
idxd_wq_put(wq);
dev_dbg(dev, "%s: client_count: %d\n", __func__,
idxd_wq_refcount(wq));
}
static enum dma_status idxd_dma_tx_status(struct dma_chan *dma_chan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
return DMA_OUT_OF_ORDER;
}
/*
* issue_pending() does not need to do anything since tx_submit() does the job
* already.
*/
static void idxd_dma_issue_pending(struct dma_chan *dma_chan)
{
}
static dma_cookie_t idxd_dma_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct dma_chan *c = tx->chan;
struct idxd_wq *wq = to_idxd_wq(c);
dma_cookie_t cookie;
int rc;
struct idxd_desc *desc = container_of(tx, struct idxd_desc, txd);
cookie = dma_cookie_assign(tx);
rc = idxd_submit_desc(wq, desc);
if (rc < 0) {
idxd_free_desc(wq, desc);
return rc;
}
return cookie;
}
static void idxd_dma_release(struct dma_device *device)
{
struct idxd_dma_dev *idxd_dma = container_of(device, struct idxd_dma_dev, dma);
kfree(idxd_dma);
}
int idxd_register_dma_device(struct idxd_device *idxd)
{
struct idxd_dma_dev *idxd_dma;
struct dma_device *dma;
struct device *dev = &idxd->pdev->dev;
int rc;
idxd_dma = kzalloc_node(sizeof(*idxd_dma), GFP_KERNEL, dev_to_node(dev));
if (!idxd_dma)
return -ENOMEM;
dma = &idxd_dma->dma;
INIT_LIST_HEAD(&dma->channels);
dma->dev = dev;
dma_cap_set(DMA_INTERRUPT, dma->cap_mask);
dma_cap_set(DMA_PRIVATE, dma->cap_mask);
dma_cap_set(DMA_COMPLETION_NO_ORDER, dma->cap_mask);
dma->device_release = idxd_dma_release;
if (idxd->hw.opcap.bits[0] & IDXD_OPCAP_MEMMOVE) {
dma_cap_set(DMA_MEMCPY, dma->cap_mask);
dma->device_prep_dma_memcpy = idxd_dma_submit_memcpy;
}
dma->device_tx_status = idxd_dma_tx_status;
dma->device_issue_pending = idxd_dma_issue_pending;
dma->device_alloc_chan_resources = idxd_dma_alloc_chan_resources;
dma->device_free_chan_resources = idxd_dma_free_chan_resources;
rc = dma_async_device_register(dma);
if (rc < 0) {
kfree(idxd_dma);
return rc;
}
idxd_dma->idxd = idxd;
/*
* This pointer is protected by the refs taken by the dma_chan. It will remain valid
* as long as there are outstanding channels.
*/
idxd->idxd_dma = idxd_dma;
return 0;
}
void idxd_unregister_dma_device(struct idxd_device *idxd)
{
dma_async_device_unregister(&idxd->idxd_dma->dma);
}
static int idxd_register_dma_channel(struct idxd_wq *wq)
{
struct idxd_device *idxd = wq->idxd;
struct dma_device *dma = &idxd->idxd_dma->dma;
struct device *dev = &idxd->pdev->dev;
struct idxd_dma_chan *idxd_chan;
struct dma_chan *chan;
int rc, i;
idxd_chan = kzalloc_node(sizeof(*idxd_chan), GFP_KERNEL, dev_to_node(dev));
if (!idxd_chan)
return -ENOMEM;
chan = &idxd_chan->chan;
chan->device = dma;
list_add_tail(&chan->device_node, &dma->channels);
for (i = 0; i < wq->num_descs; i++) {
struct idxd_desc *desc = wq->descs[i];
dma_async_tx_descriptor_init(&desc->txd, chan);
desc->txd.tx_submit = idxd_dma_tx_submit;
}
rc = dma_async_device_channel_register(dma, chan);
if (rc < 0) {
kfree(idxd_chan);
return rc;
}
wq->idxd_chan = idxd_chan;
idxd_chan->wq = wq;
get_device(wq_confdev(wq));
return 0;
}
static void idxd_unregister_dma_channel(struct idxd_wq *wq)
{
struct idxd_dma_chan *idxd_chan = wq->idxd_chan;
struct dma_chan *chan = &idxd_chan->chan;
struct idxd_dma_dev *idxd_dma = wq->idxd->idxd_dma;
dma_async_device_channel_unregister(&idxd_dma->dma, chan);
list_del(&chan->device_node);
kfree(wq->idxd_chan);
wq->idxd_chan = NULL;
put_device(wq_confdev(wq));
}
static int idxd_dmaengine_drv_probe(struct idxd_dev *idxd_dev)
{
struct device *dev = &idxd_dev->conf_dev;
struct idxd_wq *wq = idxd_dev_to_wq(idxd_dev);
struct idxd_device *idxd = wq->idxd;
int rc;
if (idxd->state != IDXD_DEV_ENABLED)
return -ENXIO;
mutex_lock(&wq->wq_lock);
wq->type = IDXD_WQT_KERNEL;
rc = drv_enable_wq(wq);
if (rc < 0) {
dev_dbg(dev, "Enable wq %d failed: %d\n", wq->id, rc);
rc = -ENXIO;
goto err;
}
rc = idxd_register_dma_channel(wq);
if (rc < 0) {
idxd->cmd_status = IDXD_SCMD_DMA_CHAN_ERR;
dev_dbg(dev, "Failed to register dma channel\n");
goto err_dma;
}
idxd->cmd_status = 0;
mutex_unlock(&wq->wq_lock);
return 0;
err_dma:
drv_disable_wq(wq);
err:
wq->type = IDXD_WQT_NONE;
mutex_unlock(&wq->wq_lock);
return rc;
}
static void idxd_dmaengine_drv_remove(struct idxd_dev *idxd_dev)
{
struct idxd_wq *wq = idxd_dev_to_wq(idxd_dev);
mutex_lock(&wq->wq_lock);
__idxd_wq_quiesce(wq);
idxd_unregister_dma_channel(wq);
drv_disable_wq(wq);
mutex_unlock(&wq->wq_lock);
}
static enum idxd_dev_type dev_types[] = {
IDXD_DEV_WQ,
IDXD_DEV_NONE,
};
struct idxd_device_driver idxd_dmaengine_drv = {
.probe = idxd_dmaengine_drv_probe,
.remove = idxd_dmaengine_drv_remove,
.name = "dmaengine",
.type = dev_types,
};
EXPORT_SYMBOL_GPL(idxd_dmaengine_drv);
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