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dmaengine: ioatdma: remove ioat1 specific code 

Cleaning up of ioat1 specific code as it is no longer supported

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Dave Jiang 2015-08-11 08:48:10 -07:00 committed by Vinod Koul
parent d73f277b32
commit 85596a1947
4 changed files with 2 additions and 892 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

151
drivers/dma/ioat/dca.c
View File

@ -71,14 +71,6 @@ static inline int dca2_tag_map_valid(u8 *tag_map)
#define APICID_BIT(x) (DCA_TAG_MAP_VALID | (x))
#define IOAT_TAG_MAP_LEN 8
static u8 ioat_tag_map_BNB[IOAT_TAG_MAP_LEN] = {
1, APICID_BIT(1), APICID_BIT(2), APICID_BIT(2), };
static u8 ioat_tag_map_SCNB[IOAT_TAG_MAP_LEN] = {
1, APICID_BIT(1), APICID_BIT(2), APICID_BIT(2), };
static u8 ioat_tag_map_CNB[IOAT_TAG_MAP_LEN] = {
1, APICID_BIT(1), APICID_BIT(3), APICID_BIT(4), APICID_BIT(2), };
static u8 ioat_tag_map_UNISYS[IOAT_TAG_MAP_LEN] = { 0 };
/* pack PCI B/D/F into a u16 */
static inline u16 dcaid_from_pcidev(struct pci_dev *pci)
{
@ -126,72 +118,6 @@ struct ioat_dca_priv {
struct ioat_dca_slot req_slots[0];
};
/* 5000 series chipset DCA Port Requester ID Table Entry Format
* [15:8] PCI-Express Bus Number
* [7:3] PCI-Express Device Number
* [2:0] PCI-Express Function Number
*
* 5000 series chipset DCA control register format
* [7:1] Reserved (0)
* [0] Ignore Function Number
*/
static int ioat_dca_add_requester(struct dca_provider *dca, struct device *dev)
{
struct ioat_dca_priv *ioatdca = dca_priv(dca);
struct pci_dev *pdev;
int i;
u16 id;
/* This implementation only supports PCI-Express */
if (!dev_is_pci(dev))
return -ENODEV;
pdev = to_pci_dev(dev);
id = dcaid_from_pcidev(pdev);
if (ioatdca->requester_count == ioatdca->max_requesters)
return -ENODEV;
for (i = 0; i < ioatdca->max_requesters; i++) {
if (ioatdca->req_slots[i].pdev == NULL) {
/* found an empty slot */
ioatdca->requester_count++;
ioatdca->req_slots[i].pdev = pdev;
ioatdca->req_slots[i].rid = id;
writew(id, ioatdca->dca_base + (i * 4));
/* make sure the ignore function bit is off */
writeb(0, ioatdca->dca_base + (i * 4) + 2);
return i;
}
}
/* Error, ioatdma->requester_count is out of whack */
return -EFAULT;
}
static int ioat_dca_remove_requester(struct dca_provider *dca,
struct device *dev)
{
struct ioat_dca_priv *ioatdca = dca_priv(dca);
struct pci_dev *pdev;
int i;
/* This implementation only supports PCI-Express */
if (!dev_is_pci(dev))
return -ENODEV;
pdev = to_pci_dev(dev);
for (i = 0; i < ioatdca->max_requesters; i++) {
if (ioatdca->req_slots[i].pdev == pdev) {
writew(0, ioatdca->dca_base + (i * 4));
ioatdca->req_slots[i].pdev = NULL;
ioatdca->req_slots[i].rid = 0;
ioatdca->requester_count--;
return i;
}
}
return -ENODEV;
}
static u8 ioat_dca_get_tag(struct dca_provider *dca,
struct device *dev,
int cpu)
@ -231,83 +157,6 @@ static int ioat_dca_dev_managed(struct dca_provider *dca,
return 0;
}
static struct dca_ops ioat_dca_ops = {
.add_requester = ioat_dca_add_requester,
.remove_requester = ioat_dca_remove_requester,
.get_tag = ioat_dca_get_tag,
.dev_managed = ioat_dca_dev_managed,
};
struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase)
{
struct dca_provider *dca;
struct ioat_dca_priv *ioatdca;
u8 *tag_map = NULL;
int i;
int err;
u8 version;
u8 max_requesters;
if (!system_has_dca_enabled(pdev))
return NULL;
/* I/OAT v1 systems must have a known tag_map to support DCA */
switch (pdev->vendor) {
case PCI_VENDOR_ID_INTEL:
switch (pdev->device) {
case PCI_DEVICE_ID_INTEL_IOAT:
tag_map = ioat_tag_map_BNB;
break;
case PCI_DEVICE_ID_INTEL_IOAT_CNB:
tag_map = ioat_tag_map_CNB;
break;
case PCI_DEVICE_ID_INTEL_IOAT_SCNB:
tag_map = ioat_tag_map_SCNB;
break;
}
break;
case PCI_VENDOR_ID_UNISYS:
switch (pdev->device) {
case PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR:
tag_map = ioat_tag_map_UNISYS;
break;
}
break;
}
if (tag_map == NULL)
return NULL;
version = readb(iobase + IOAT_VER_OFFSET);
if (version == IOAT_VER_3_0)
max_requesters = IOAT3_DCA_MAX_REQ;
else
max_requesters = IOAT_DCA_MAX_REQ;
dca = alloc_dca_provider(&ioat_dca_ops,
sizeof(*ioatdca) +
(sizeof(struct ioat_dca_slot) * max_requesters));
if (!dca)
return NULL;
ioatdca = dca_priv(dca);
ioatdca->max_requesters = max_requesters;
ioatdca->dca_base = iobase + 0x54;
/* copy over the APIC ID to DCA tag mapping */
for (i = 0; i < IOAT_TAG_MAP_LEN; i++)
ioatdca->tag_map[i] = tag_map[i];
err = register_dca_provider(dca, &pdev->dev);
if (err) {
free_dca_provider(dca);
return NULL;
}
return dca;
}
static int ioat2_dca_add_requester(struct dca_provider *dca, struct device *dev)
{
struct ioat_dca_priv *ioatdca = dca_priv(dca);

674
drivers/dma/ioat/dma.c
View File

@ -1,6 +1,6 @@
/*
* Intel I/OAT DMA Linux driver
* Copyright(c) 2004 - 2009 Intel Corporation.
* Copyright(c) 2004 - 2015 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -43,10 +43,6 @@ module_param(ioat_pending_level, int, 0644);
MODULE_PARM_DESC(ioat_pending_level,
"high-water mark for pushing ioat descriptors (default: 4)");
/* internal functions */
static void ioat1_cleanup(struct ioat_dma_chan *ioat);
static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat);
/**
* ioat_dma_do_interrupt - handler used for single vector interrupt mode
* @irq: interrupt id
@ -116,248 +112,6 @@ void ioat_init_channel(struct ioatdma_device *device, struct ioat_chan_common *c
tasklet_init(&chan->cleanup_task, device->cleanup_fn, data);
}
/**
* ioat1_dma_enumerate_channels - find and initialize the device's channels
* @device: the device to be enumerated
*/
static int ioat1_enumerate_channels(struct ioatdma_device *device)
{
u8 xfercap_scale;
u32 xfercap;
int i;
struct ioat_dma_chan *ioat;
struct device *dev = &device->pdev->dev;
struct dma_device *dma = &device->common;
INIT_LIST_HEAD(&dma->channels);
dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET);
dma->chancnt &= 0x1f; /* bits [4:0] valid */
if (dma->chancnt > ARRAY_SIZE(device->idx)) {
dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
dma->chancnt, ARRAY_SIZE(device->idx));
dma->chancnt = ARRAY_SIZE(device->idx);
}
xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET);
xfercap_scale &= 0x1f; /* bits [4:0] valid */
xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale));
dev_dbg(dev, "%s: xfercap = %d\n", __func__, xfercap);
#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL
if (i7300_idle_platform_probe(NULL, NULL, 1) == 0)
dma->chancnt--;
#endif
for (i = 0; i < dma->chancnt; i++) {
ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL);
if (!ioat)
break;
ioat_init_channel(device, &ioat->base, i);
ioat->xfercap = xfercap;
spin_lock_init(&ioat->desc_lock);
INIT_LIST_HEAD(&ioat->free_desc);
INIT_LIST_HEAD(&ioat->used_desc);
}
dma->chancnt = i;
return i;
}
/**
* ioat_dma_memcpy_issue_pending - push potentially unrecognized appended
* descriptors to hw
* @chan: DMA channel handle
*/
static inline void
__ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat)
{
void __iomem *reg_base = ioat->base.reg_base;
dev_dbg(to_dev(&ioat->base), "%s: pending: %d\n",
__func__, ioat->pending);
ioat->pending = 0;
writeb(IOAT_CHANCMD_APPEND, reg_base + IOAT1_CHANCMD_OFFSET);
}
static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan)
{
struct ioat_dma_chan *ioat = to_ioat_chan(chan);
if (ioat->pending > 0) {
spin_lock_bh(&ioat->desc_lock);
__ioat1_dma_memcpy_issue_pending(ioat);
spin_unlock_bh(&ioat->desc_lock);
}
}
/**
* ioat1_reset_channel - restart a channel
* @ioat: IOAT DMA channel handle
*/
static void ioat1_reset_channel(struct ioat_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
void __iomem *reg_base = chan->reg_base;
u32 chansts, chanerr;
dev_warn(to_dev(chan), "reset\n");
chanerr = readl(reg_base + IOAT_CHANERR_OFFSET);
chansts = *chan->completion & IOAT_CHANSTS_STATUS;
if (chanerr) {
dev_err(to_dev(chan),
"chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n",
chan_num(chan), chansts, chanerr);
writel(chanerr, reg_base + IOAT_CHANERR_OFFSET);
}
/*
* whack it upside the head with a reset
* and wait for things to settle out.
* force the pending count to a really big negative
* to make sure no one forces an issue_pending
* while we're waiting.
*/
ioat->pending = INT_MIN;
writeb(IOAT_CHANCMD_RESET,
reg_base + IOAT_CHANCMD_OFFSET(chan->device->version));
set_bit(IOAT_RESET_PENDING, &chan->state);
mod_timer(&chan->timer, jiffies + RESET_DELAY);
}
static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct dma_chan *c = tx->chan;
struct ioat_dma_chan *ioat = to_ioat_chan(c);
struct ioat_desc_sw *desc = tx_to_ioat_desc(tx);
struct ioat_chan_common *chan = &ioat->base;
struct ioat_desc_sw *first;
struct ioat_desc_sw *chain_tail;
dma_cookie_t cookie;
spin_lock_bh(&ioat->desc_lock);
/* cookie incr and addition to used_list must be atomic */
cookie = dma_cookie_assign(tx);
dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie);
/* write address into NextDescriptor field of last desc in chain */
first = to_ioat_desc(desc->tx_list.next);
chain_tail = to_ioat_desc(ioat->used_desc.prev);
/* make descriptor updates globally visible before chaining */
wmb();
chain_tail->hw->next = first->txd.phys;
list_splice_tail_init(&desc->tx_list, &ioat->used_desc);
dump_desc_dbg(ioat, chain_tail);
dump_desc_dbg(ioat, first);
if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state))
mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT);
ioat->active += desc->hw->tx_cnt;
ioat->pending += desc->hw->tx_cnt;
if (ioat->pending >= ioat_pending_level)
__ioat1_dma_memcpy_issue_pending(ioat);
spin_unlock_bh(&ioat->desc_lock);
return cookie;
}
/**
* ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair
* @ioat: the channel supplying the memory pool for the descriptors
* @flags: allocation flags
*/
static struct ioat_desc_sw *
ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags)
{
struct ioat_dma_descriptor *desc;
struct ioat_desc_sw *desc_sw;
struct ioatdma_device *ioatdma_device;
dma_addr_t phys;
ioatdma_device = ioat->base.device;
desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys);
if (unlikely(!desc))
return NULL;
desc_sw = kzalloc(sizeof(*desc_sw), flags);
if (unlikely(!desc_sw)) {
pci_pool_free(ioatdma_device->dma_pool, desc, phys);
return NULL;
}
memset(desc, 0, sizeof(*desc));
INIT_LIST_HEAD(&desc_sw->tx_list);
dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common);
desc_sw->txd.tx_submit = ioat1_tx_submit;
desc_sw->hw = desc;
desc_sw->txd.phys = phys;
set_desc_id(desc_sw, -1);
return desc_sw;
}
static int ioat_initial_desc_count = 256;
module_param(ioat_initial_desc_count, int, 0644);
MODULE_PARM_DESC(ioat_initial_desc_count,
"ioat1: initial descriptors per channel (default: 256)");
/**
* ioat1_dma_alloc_chan_resources - returns the number of allocated descriptors
* @chan: the channel to be filled out
*/
static int ioat1_dma_alloc_chan_resources(struct dma_chan *c)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
struct ioat_chan_common *chan = &ioat->base;
struct ioat_desc_sw *desc;
u32 chanerr;
int i;
LIST_HEAD(tmp_list);
/* have we already been set up? */
if (!list_empty(&ioat->free_desc))
return ioat->desccount;
/* Setup register to interrupt and write completion status on error */
writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET);
chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
if (chanerr) {
dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr);
writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET);
}
/* Allocate descriptors */
for (i = 0; i < ioat_initial_desc_count; i++) {
desc = ioat_dma_alloc_descriptor(ioat, GFP_KERNEL);
if (!desc) {
dev_err(to_dev(chan), "Only %d initial descriptors\n", i);
break;
}
set_desc_id(desc, i);
list_add_tail(&desc->node, &tmp_list);
}
spin_lock_bh(&ioat->desc_lock);
ioat->desccount = i;
list_splice(&tmp_list, &ioat->free_desc);
spin_unlock_bh(&ioat->desc_lock);
/* allocate a completion writeback area */
/* doing 2 32bit writes to mmio since 1 64b write doesn't work */
chan->completion = pci_pool_alloc(chan->device->completion_pool,
GFP_KERNEL, &chan->completion_dma);
memset(chan->completion, 0, sizeof(*chan->completion));
writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF,
chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
writel(((u64) chan->completion_dma) >> 32,
chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
set_bit(IOAT_RUN, &chan->state);
ioat1_dma_start_null_desc(ioat); /* give chain to dma device */
dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n",
__func__, ioat->desccount);
return ioat->desccount;
}
void ioat_stop(struct ioat_chan_common *chan)
{
struct ioatdma_device *device = chan->device;
@ -394,177 +148,6 @@ void ioat_stop(struct ioat_chan_common *chan)
device->cleanup_fn((unsigned long) &chan->common);
}
/**
* ioat1_dma_free_chan_resources - release all the descriptors
* @chan: the channel to be cleaned
*/
static void ioat1_dma_free_chan_resources(struct dma_chan *c)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
struct ioat_chan_common *chan = &ioat->base;
struct ioatdma_device *ioatdma_device = chan->device;
struct ioat_desc_sw *desc, *_desc;
int in_use_descs = 0;
/* Before freeing channel resources first check
* if they have been previously allocated for this channel.
*/
if (ioat->desccount == 0)
return;
ioat_stop(chan);
/* Delay 100ms after reset to allow internal DMA logic to quiesce
* before removing DMA descriptor resources.
*/
writeb(IOAT_CHANCMD_RESET,
chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version));
mdelay(100);
spin_lock_bh(&ioat->desc_lock);
list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) {
dev_dbg(to_dev(chan), "%s: freeing %d from used list\n",
__func__, desc_id(desc));
dump_desc_dbg(ioat, desc);
in_use_descs++;
list_del(&desc->node);
pci_pool_free(ioatdma_device->dma_pool, desc->hw,
desc->txd.phys);
kfree(desc);
}
list_for_each_entry_safe(desc, _desc,
&ioat->free_desc, node) {
list_del(&desc->node);
pci_pool_free(ioatdma_device->dma_pool, desc->hw,
desc->txd.phys);
kfree(desc);
}
spin_unlock_bh(&ioat->desc_lock);
pci_pool_free(ioatdma_device->completion_pool,
chan->completion,
chan->completion_dma);
/* one is ok since we left it on there on purpose */
if (in_use_descs > 1)
dev_err(to_dev(chan), "Freeing %d in use descriptors!\n",
in_use_descs - 1);
chan->last_completion = 0;
chan->completion_dma = 0;
ioat->pending = 0;
ioat->desccount = 0;
}
/**
* ioat1_dma_get_next_descriptor - return the next available descriptor
* @ioat: IOAT DMA channel handle
*
* Gets the next descriptor from the chain, and must be called with the
* channel's desc_lock held. Allocates more descriptors if the channel
* has run out.
*/
static struct ioat_desc_sw *
ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat)
{
struct ioat_desc_sw *new;
if (!list_empty(&ioat->free_desc)) {
new = to_ioat_desc(ioat->free_desc.next);
list_del(&new->node);
} else {
/* try to get another desc */
new = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC);
if (!new) {
dev_err(to_dev(&ioat->base), "alloc failed\n");
return NULL;
}
}
dev_dbg(to_dev(&ioat->base), "%s: allocated: %d\n",
__func__, desc_id(new));
prefetch(new->hw);
return new;
}
static struct dma_async_tx_descriptor *
ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest,
dma_addr_t dma_src, size_t len, unsigned long flags)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
struct ioat_desc_sw *desc;
size_t copy;
LIST_HEAD(chain);
dma_addr_t src = dma_src;
dma_addr_t dest = dma_dest;
size_t total_len = len;
struct ioat_dma_descriptor *hw = NULL;
int tx_cnt = 0;
spin_lock_bh(&ioat->desc_lock);
desc = ioat1_dma_get_next_descriptor(ioat);
do {
if (!desc)
break;
tx_cnt++;
copy = min_t(size_t, len, ioat->xfercap);
hw = desc->hw;
hw->size = copy;
hw->ctl = 0;
hw->src_addr = src;
hw->dst_addr = dest;
list_add_tail(&desc->node, &chain);
len -= copy;
dest += copy;
src += copy;
if (len) {
struct ioat_desc_sw *next;
async_tx_ack(&desc->txd);
next = ioat1_dma_get_next_descriptor(ioat);
hw->next = next ? next->txd.phys : 0;
dump_desc_dbg(ioat, desc);
desc = next;
} else
hw->next = 0;
} while (len);
if (!desc) {
struct ioat_chan_common *chan = &ioat->base;
dev_err(to_dev(chan),
"chan%d - get_next_desc failed\n", chan_num(chan));
list_splice(&chain, &ioat->free_desc);
spin_unlock_bh(&ioat->desc_lock);
return NULL;
}
spin_unlock_bh(&ioat->desc_lock);
desc->txd.flags = flags;
desc->len = total_len;
list_splice(&chain, &desc->tx_list);
hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
hw->ctl_f.compl_write = 1;
hw->tx_cnt = tx_cnt;
dump_desc_dbg(ioat, desc);
return &desc->txd;
}
static void ioat1_cleanup_event(unsigned long data)
{
struct ioat_dma_chan *ioat = to_ioat_chan((void *) data);
struct ioat_chan_common *chan = &ioat->base;
ioat1_cleanup(ioat);
if (!test_bit(IOAT_RUN, &chan->state))
return;
writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);
}
dma_addr_t ioat_get_current_completion(struct ioat_chan_common *chan)
{
dma_addr_t phys_complete;
@ -599,150 +182,6 @@ bool ioat_cleanup_preamble(struct ioat_chan_common *chan,
return true;
}
static void __cleanup(struct ioat_dma_chan *ioat, dma_addr_t phys_complete)
{
struct ioat_chan_common *chan = &ioat->base;
struct list_head *_desc, *n;
struct dma_async_tx_descriptor *tx;
dev_dbg(to_dev(chan), "%s: phys_complete: %llx\n",
__func__, (unsigned long long) phys_complete);
list_for_each_safe(_desc, n, &ioat->used_desc) {
struct ioat_desc_sw *desc;
prefetch(n);
desc = list_entry(_desc, typeof(*desc), node);
tx = &desc->txd;
/*
* 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.
*/
dump_desc_dbg(ioat, desc);
if (tx->cookie) {
dma_cookie_complete(tx);
dma_descriptor_unmap(tx);
ioat->active -= desc->hw->tx_cnt;
if (tx->callback) {
tx->callback(tx->callback_param);
tx->callback = NULL;
}
}
if (tx->phys != phys_complete) {
/*
* a completed entry, but not the last, so clean
* up if the client is done with the descriptor
*/
if (async_tx_test_ack(tx))
list_move_tail(&desc->node, &ioat->free_desc);
} else {
/*
* last used desc. Do not remove, so we can
* append from it.
*/
/* if nothing else is pending, cancel the
* completion timeout
*/
if (n == &ioat->used_desc) {
dev_dbg(to_dev(chan),
"%s cancel completion timeout\n",
__func__);
clear_bit(IOAT_COMPLETION_PENDING, &chan->state);
}
/* TODO check status bits? */
break;
}
}
chan->last_completion = phys_complete;
}
/**
* ioat1_cleanup - cleanup up finished descriptors
* @chan: ioat channel to be cleaned up
*
* To prevent lock contention we defer cleanup when the locks are
* contended with a terminal timeout that forces cleanup and catches
* completion notification errors.
*/
static void ioat1_cleanup(struct ioat_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
dma_addr_t phys_complete;
prefetch(chan->completion);
if (!spin_trylock_bh(&chan->cleanup_lock))
return;
if (!ioat_cleanup_preamble(chan, &phys_complete)) {
spin_unlock_bh(&chan->cleanup_lock);
return;
}
if (!spin_trylock_bh(&ioat->desc_lock)) {
spin_unlock_bh(&chan->cleanup_lock);
return;
}
__cleanup(ioat, phys_complete);
spin_unlock_bh(&ioat->desc_lock);
spin_unlock_bh(&chan->cleanup_lock);
}
static void ioat1_timer_event(unsigned long data)
{
struct ioat_dma_chan *ioat = to_ioat_chan((void *) data);
struct ioat_chan_common *chan = &ioat->base;
dev_dbg(to_dev(chan), "%s: state: %lx\n", __func__, chan->state);
spin_lock_bh(&chan->cleanup_lock);
if (test_and_clear_bit(IOAT_RESET_PENDING, &chan->state)) {
struct ioat_desc_sw *desc;
spin_lock_bh(&ioat->desc_lock);
/* restart active descriptors */
desc = to_ioat_desc(ioat->used_desc.prev);
ioat_set_chainaddr(ioat, desc->txd.phys);
ioat_start(chan);
ioat->pending = 0;
set_bit(IOAT_COMPLETION_PENDING, &chan->state);
mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT);
spin_unlock_bh(&ioat->desc_lock);
} else if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) {
dma_addr_t phys_complete;
spin_lock_bh(&ioat->desc_lock);
/* if we haven't made progress and we have already
* acknowledged a pending completion once, then be more
* forceful with a restart
*/
if (ioat_cleanup_preamble(chan, &phys_complete))
__cleanup(ioat, phys_complete);
else if (test_bit(IOAT_COMPLETION_ACK, &chan->state))
ioat1_reset_channel(ioat);
else {
u64 status = ioat_chansts(chan);
/* manually update the last completion address */
if (ioat_chansts_to_addr(status) != 0)
*chan->completion = status;
set_bit(IOAT_COMPLETION_ACK, &chan->state);
mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT);
}
spin_unlock_bh(&ioat->desc_lock);
}
spin_unlock_bh(&chan->cleanup_lock);
}
enum dma_status
ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,
struct dma_tx_state *txstate)
@ -760,42 +199,6 @@ ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,
return dma_cookie_status(c, cookie, txstate);
}
static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
struct ioat_desc_sw *desc;
struct ioat_dma_descriptor *hw;
spin_lock_bh(&ioat->desc_lock);
desc = ioat1_dma_get_next_descriptor(ioat);
if (!desc) {
dev_err(to_dev(chan),
"Unable to start null desc - get next desc failed\n");
spin_unlock_bh(&ioat->desc_lock);
return;
}
hw = desc->hw;
hw->ctl = 0;
hw->ctl_f.null = 1;
hw->ctl_f.int_en = 1;
hw->ctl_f.compl_write = 1;
/* set size to non-zero value (channel returns error when size is 0) */
hw->size = NULL_DESC_BUFFER_SIZE;
hw->src_addr = 0;
hw->dst_addr = 0;
async_tx_ack(&desc->txd);
hw->next = 0;
list_add_tail(&desc->node, &ioat->used_desc);
dump_desc_dbg(ioat, desc);
ioat_set_chainaddr(ioat, desc->txd.phys);
ioat_start(chan);
spin_unlock_bh(&ioat->desc_lock);
}
/*
* Perform a IOAT transaction to verify the HW works.
*/
@ -1077,36 +480,6 @@ int ioat_register(struct ioatdma_device *device)
return err;
}
/* ioat1_intr_quirk - fix up dma ctrl register to enable / disable msi */
static void ioat1_intr_quirk(struct ioatdma_device *device)
{
struct pci_dev *pdev = device->pdev;
u32 dmactrl;
pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl);
if (pdev->msi_enabled)
dmactrl |= IOAT_PCI_DMACTRL_MSI_EN;
else
dmactrl &= ~IOAT_PCI_DMACTRL_MSI_EN;
pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl);
}
static ssize_t ring_size_show(struct dma_chan *c, char *page)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
return sprintf(page, "%d\n", ioat->desccount);
}
static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size);
static ssize_t ring_active_show(struct dma_chan *c, char *page)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
return sprintf(page, "%d\n", ioat->active);
}
static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active);
static ssize_t cap_show(struct dma_chan *c, char *page)
{
struct dma_device *dma = c->device;
@ -1131,14 +504,6 @@ static ssize_t version_show(struct dma_chan *c, char *page)
}
struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);
static struct attribute *ioat1_attrs[] = {
&ring_size_attr.attr,
&ring_active_attr.attr,
&ioat_cap_attr.attr,
&ioat_version_attr.attr,
NULL,
};
static ssize_t
ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
@ -1157,11 +522,6 @@ const struct sysfs_ops ioat_sysfs_ops = {
.show = ioat_attr_show,
};
static struct kobj_type ioat1_ktype = {
.sysfs_ops = &ioat_sysfs_ops,
.default_attrs = ioat1_attrs,
};
void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type)
{
struct dma_device *dma = &device->common;
@ -1197,38 +557,6 @@ void ioat_kobject_del(struct ioatdma_device *device)
}
}
int ioat1_dma_probe(struct ioatdma_device *device, int dca)
{
struct pci_dev *pdev = device->pdev;
struct dma_device *dma;
int err;
device->intr_quirk = ioat1_intr_quirk;
device->enumerate_channels = ioat1_enumerate_channels;
device->self_test = ioat_dma_self_test;
device->timer_fn = ioat1_timer_event;
device->cleanup_fn = ioat1_cleanup_event;
dma = &device->common;
dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy;
dma->device_issue_pending = ioat1_dma_memcpy_issue_pending;
dma->device_alloc_chan_resources = ioat1_dma_alloc_chan_resources;
dma->device_free_chan_resources = ioat1_dma_free_chan_resources;
dma->device_tx_status = ioat_dma_tx_status;
err = ioat_probe(device);
if (err)
return err;
err = ioat_register(device);
if (err)
return err;
ioat_kobject_add(device, &ioat1_ktype);
if (dca)
device->dca = ioat_dca_init(pdev, device->reg_base);
return err;
}
void ioat_dma_remove(struct ioatdma_device *device)
{
struct dma_device *dma = &device->common;

65
drivers/dma/ioat/dma.h
View File

@ -28,12 +28,9 @@
#define IOAT_DMA_VERSION "4.00"
#define IOAT_LOW_COMPLETION_MASK 0xffffffc0
#define IOAT_DMA_DCA_ANY_CPU ~0
#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_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, txd)
#define to_dev(ioat_chan) (&(ioat_chan)->device->pdev->dev)
#define to_pdev(ioat_chan) ((ioat_chan)->device->pdev)
@ -122,23 +119,6 @@ struct ioat_sysfs_entry {
ssize_t (*show)(struct dma_chan *, char *);
};
/**
* struct ioat_dma_chan - internal representation of a DMA channel
*/
struct ioat_dma_chan {
struct ioat_chan_common base;
size_t xfercap; /* XFERCAP register value expanded out */
spinlock_t desc_lock;
struct list_head free_desc;
struct list_head used_desc;
int pending;
u16 desccount;
u16 active;
};
/**
* struct ioat_sed_ent - wrapper around super extended hardware descriptor
* @hw: hardware SED
@ -158,34 +138,8 @@ static inline struct ioat_chan_common *to_chan_common(struct dma_chan *c)
return container_of(c, struct ioat_chan_common, common);
}
static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c)
{
struct ioat_chan_common *chan = to_chan_common(c);
return container_of(chan, struct ioat_dma_chan, base);
}
/* wrapper around hardware descriptor format + additional software fields */
/**
* struct ioat_desc_sw - wrapper around hardware descriptor
* @hw: hardware DMA descriptor (for memcpy)
* @node: this descriptor will either be on the free list,
* or attached to a transaction list (tx_list)
* @txd: the generic software descriptor for all engines
* @id: identifier for debug
*/
struct ioat_desc_sw {
struct ioat_dma_descriptor *hw;
struct list_head node;
size_t len;
struct list_head tx_list;
struct dma_async_tx_descriptor txd;
#ifdef DEBUG
int id;
#endif
};
#ifdef DEBUG
#define set_desc_id(desc, i) ((desc)->id = (i))
#define desc_id(desc) ((desc)->id)
@ -253,13 +207,6 @@ static inline u64 ioat_chansts(struct ioat_chan_common *chan)
#define ioat_chansts ioat_chansts_32
#endif
static inline void ioat_start(struct ioat_chan_common *chan)
{
u8 ver = chan->device->version;
writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
}
static inline u64 ioat_chansts_to_addr(u64 status)
{
return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
@ -293,16 +240,6 @@ static inline bool ioat_reset_pending(struct ioat_chan_common *chan)
return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET;
}
static inline void ioat_set_chainaddr(struct ioat_dma_chan *ioat, u64 addr)
{
struct ioat_chan_common *chan = &ioat->base;
writel(addr & 0x00000000FFFFFFFF,
chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW);
writel(addr >> 32,
chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH);
}
static inline bool is_ioat_active(unsigned long status)
{
return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE);
@ -331,11 +268,9 @@ static inline bool is_ioat_bug(unsigned long err)
int ioat_probe(struct ioatdma_device *device);
int ioat_register(struct ioatdma_device *device);
int ioat1_dma_probe(struct ioatdma_device *dev, int dca);
int ioat_dma_self_test(struct ioatdma_device *device);
void ioat_dma_remove(struct ioatdma_device *device);
struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase);
dma_addr_t ioat_get_current_completion(struct ioat_chan_common *chan);
void ioat_init_channel(struct ioatdma_device *device,
struct ioat_chan_common *chan, int idx);
enum dma_status ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,

4
drivers/dma/ioat/pci.c
View File

@ -210,9 +210,7 @@ static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, device);
device->version = readb(device->reg_base + IOAT_VER_OFFSET);
if (device->version == IOAT_VER_1_2)
err = ioat1_dma_probe(device, ioat_dca_enabled);
else if (device->version == IOAT_VER_2_0)
if (device->version == IOAT_VER_2_0)
err = ioat2_dma_probe(device, ioat_dca_enabled);
else if (device->version >= IOAT_VER_3_0)
err = ioat3_dma_probe(device, ioat_dca_enabled);