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dmaengine fixes for v5.6-rc5 

Bunch of driver fixes:
  - Doc updates to clean warnings for dmaengine
  - Fixes for newly added Intel idxd driver
  - More fixes for newly added TI k3-udma driver
  - Fixes for IMX and Tegra drivers.
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Merge tag 'dmaengine-fix-5.6-rc5' of git://git.infradead.org/users/vkoul/slave-dma

Pull dmaengine fixes from Vinod Koul:
 "A bunch of driver fixes:

   - Doc updates to clean warnings for dmaengine

   - Fixes for newly added Intel idxd driver

   - More fixes for newly added TI k3-udma driver

   - Fixes for IMX and Tegra drivers"

* tag 'dmaengine-fix-5.6-rc5' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: imx-sdma: Fix the event id check to include RX event for UART6
  dmaengine: tegra-apb: Prevent race conditions of tasklet vs free list
  dmaengine: tegra-apb: Fix use-after-free
  dmaengine: imx-sdma: fix context cache
  dmaengine: idxd: wq size configuration needs to check global max size
  dmaengine: idxd: sysfs input of wq incorrect wq type should return error
  dmaengine: coh901318: Fix a double lock bug in dma_tc_handle()
  dmaengine: idxd: correct reserved token calculation
  dmaengine: ti: k3-udma: Fix terminated transfer handling
  dmaengine: ti: k3-udma: Use the channel direction in pause/resume functions
  dmaengine: ti: k3-udma: Use the TR counter helper for slave_sg and cyclic
  dmaengine: ti: k3-udma: Move the TR counter calculation to helper function
  dmaengine: ti: k3-udma: Workaround for RX teardown with stale data in peer
  dmaengine: ti: k3-udma: Use ktime/usleep_range based TX completion check
  dmaengine: idxd: Fix error handling in idxd_wq_cdev_dev_setup()
  dmaengine: doc: fix warnings/issues of client.rst
  dmaengine: idxd: fix runaway module ref count on device driver bind
This commit is contained in:
Linus Torvalds 2020-03-05 12:19:34 -06:00
parent 776e49e8dd 25962e1a7f
commit 6fd145da21
7 changed files with 400 additions and 153 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Documentation/driver-api/dmaengine/client.rst
View File

@ -151,8 +151,8 @@ The details of these operations are:
Note that callbacks will always be invoked from the DMA
engines tasklet, never from interrupt context.
Optional: per descriptor metadata
---------------------------------
**Optional: per descriptor metadata**
DMAengine provides two ways for metadata support.
DESC_METADATA_CLIENT
@ -199,12 +199,15 @@ Optional: per descriptor metadata
DESC_METADATA_CLIENT
- DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
1. prepare the descriptor (dmaengine_prep_*)
construct the metadata in the client's buffer
2. use dmaengine_desc_attach_metadata() to attach the buffer to the
descriptor
3. submit the transfer
- DMA_DEV_TO_MEM:
1. prepare the descriptor (dmaengine_prep_*)
2. use dmaengine_desc_attach_metadata() to attach the buffer to the
descriptor
@ -215,6 +218,7 @@ Optional: per descriptor metadata
DESC_METADATA_ENGINE
- DMA_MEM_TO_DEV / DEV_MEM_TO_MEM:
1. prepare the descriptor (dmaengine_prep_*)
2. use dmaengine_desc_get_metadata_ptr() to get the pointer to the
engine's metadata area
@ -222,7 +226,9 @@ Optional: per descriptor metadata
4. use dmaengine_desc_set_metadata_len() to tell the DMA engine the
amount of data the client has placed into the metadata buffer
5. submit the transfer
- DMA_DEV_TO_MEM:
1. prepare the descriptor (dmaengine_prep_*)
2. submit the transfer
3. on transfer completion, use dmaengine_desc_get_metadata_ptr() to get
@ -278,8 +284,8 @@ Optional: per descriptor metadata
void dma_async_issue_pending(struct dma_chan *chan);
Further APIs:
-------------
Further APIs
------------
1. Terminate APIs

4
drivers/dma/coh901318.c
View File

@ -1947,8 +1947,6 @@ static void dma_tc_handle(struct coh901318_chan *cohc)
return;
}
spin_lock(&cohc->lock);
/*
* When we reach this point, at least one queue item
* should have been moved over from cohc->queue to
@ -1969,8 +1967,6 @@ static void dma_tc_handle(struct coh901318_chan *cohc)
if (coh901318_queue_start(cohc) == NULL)
cohc->busy = 0;
spin_unlock(&cohc->lock);
/*
* This tasklet will remove items from cohc->active
* and thus terminates them.

4
drivers/dma/idxd/cdev.c
View File

@ -204,6 +204,7 @@ static int idxd_wq_cdev_dev_setup(struct idxd_wq *wq)
minor = ida_simple_get(&cdev_ctx->minor_ida, 0, MINORMASK, GFP_KERNEL);
if (minor < 0) {
rc = minor;
kfree(dev);
goto ida_err;
}
@ -212,7 +213,6 @@ static int idxd_wq_cdev_dev_setup(struct idxd_wq *wq)
rc = device_register(dev);
if (rc < 0) {
dev_err(&idxd->pdev->dev, "device register failed\n");
put_device(dev);
goto dev_reg_err;
}
idxd_cdev->minor = minor;
@ -221,8 +221,8 @@ static int idxd_wq_cdev_dev_setup(struct idxd_wq *wq)
dev_reg_err:
ida_simple_remove(&cdev_ctx->minor_ida, MINOR(dev->devt));
put_device(dev);
ida_err:
kfree(dev);
idxd_cdev->dev = NULL;
return rc;
}

27
drivers/dma/idxd/sysfs.c
View File

@ -124,6 +124,7 @@ static int idxd_config_bus_probe(struct device *dev)
rc = idxd_device_config(idxd);
if (rc < 0) {
spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
dev_warn(dev, "Device config failed: %d\n", rc);
return rc;
}
@ -132,6 +133,7 @@ static int idxd_config_bus_probe(struct device *dev)
rc = idxd_device_enable(idxd);
if (rc < 0) {
spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
dev_warn(dev, "Device enable failed: %d\n", rc);
return rc;
}
@ -142,6 +144,7 @@ static int idxd_config_bus_probe(struct device *dev)
rc = idxd_register_dma_device(idxd);
if (rc < 0) {
spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
dev_dbg(dev, "Failed to register dmaengine device\n");
return rc;
}
@ -516,7 +519,7 @@ static ssize_t group_tokens_reserved_store(struct device *dev,
if (val > idxd->max_tokens)
return -EINVAL;
if (val > idxd->nr_tokens)
if (val > idxd->nr_tokens + group->tokens_reserved)
return -EINVAL;
group->tokens_reserved = val;
@ -901,6 +904,20 @@ static ssize_t wq_size_show(struct device *dev, struct device_attribute *attr,
return sprintf(buf, "%u\n", wq->size);
}
static int total_claimed_wq_size(struct idxd_device *idxd)
{
int i;
int wq_size = 0;
for (i = 0; i < idxd->max_wqs; i++) {
struct idxd_wq *wq = &idxd->wqs[i];
wq_size += wq->size;
}
return wq_size;
}
static ssize_t wq_size_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
@ -920,7 +937,7 @@ static ssize_t wq_size_store(struct device *dev,
if (wq->state != IDXD_WQ_DISABLED)
return -EPERM;
if (size > idxd->max_wq_size)
if (size + total_claimed_wq_size(idxd) - wq->size > idxd->max_wq_size)
return -EINVAL;
wq->size = size;
@ -999,12 +1016,14 @@ static ssize_t wq_type_store(struct device *dev,
return -EPERM;
old_type = wq->type;
if (sysfs_streq(buf, idxd_wq_type_names[IDXD_WQT_KERNEL]))
if (sysfs_streq(buf, idxd_wq_type_names[IDXD_WQT_NONE]))
wq->type = IDXD_WQT_NONE;
else if (sysfs_streq(buf, idxd_wq_type_names[IDXD_WQT_KERNEL]))
wq->type = IDXD_WQT_KERNEL;
else if (sysfs_streq(buf, idxd_wq_type_names[IDXD_WQT_USER]))
wq->type = IDXD_WQT_USER;
else
wq->type = IDXD_WQT_NONE;
return -EINVAL;
/* If we are changing queue type, clear the name */
if (wq->type != old_type)

5
drivers/dma/imx-sdma.c
View File

@ -1331,13 +1331,14 @@ static void sdma_free_chan_resources(struct dma_chan *chan)
sdma_channel_synchronize(chan);
if (sdmac->event_id0)
if (sdmac->event_id0 >= 0)
sdma_event_disable(sdmac, sdmac->event_id0);
if (sdmac->event_id1)
sdma_event_disable(sdmac, sdmac->event_id1);
sdmac->event_id0 = 0;
sdmac->event_id1 = 0;
sdmac->context_loaded = false;
sdma_set_channel_priority(sdmac, 0);
@ -1631,7 +1632,7 @@ static int sdma_config(struct dma_chan *chan,
memcpy(&sdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg));
/* Set ENBLn earlier to make sure dma request triggered after that */
if (sdmac->event_id0) {
if (sdmac->event_id0 >= 0) {
if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events)
return -EINVAL;
sdma_event_enable(sdmac, sdmac->event_id0);

6
drivers/dma/tegra20-apb-dma.c
View File

@ -281,7 +281,7 @@ static struct tegra_dma_desc *tegra_dma_desc_get(
/* Do not allocate if desc are waiting for ack */
list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) {
if (async_tx_test_ack(&dma_desc->txd)) {
if (async_tx_test_ack(&dma_desc->txd) && !dma_desc->cb_count) {
list_del(&dma_desc->node);
spin_unlock_irqrestore(&tdc->lock, flags);
dma_desc->txd.flags = 0;
@ -756,10 +756,6 @@ static int tegra_dma_terminate_all(struct dma_chan *dc)
bool was_busy;
spin_lock_irqsave(&tdc->lock, flags);
if (list_empty(&tdc->pending_sg_req)) {
spin_unlock_irqrestore(&tdc->lock, flags);
return 0;
}
if (!tdc->busy)
goto skip_dma_stop;

493
drivers/dma/ti/k3-udma.c
View File

@ -5,6 +5,7 @@
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
@ -96,6 +97,24 @@ struct udma_match_data {
u32 level_start_idx[];
};
struct udma_hwdesc {
size_t cppi5_desc_size;
void *cppi5_desc_vaddr;
dma_addr_t cppi5_desc_paddr;
/* TR descriptor internal pointers */
void *tr_req_base;
struct cppi5_tr_resp_t *tr_resp_base;
};
struct udma_rx_flush {
struct udma_hwdesc hwdescs[2];
size_t buffer_size;
void *buffer_vaddr;
dma_addr_t buffer_paddr;
};
struct udma_dev {
struct dma_device ddev;
struct device *dev;
@ -112,6 +131,8 @@ struct udma_dev {
struct list_head desc_to_purge;
spinlock_t lock;
struct udma_rx_flush rx_flush;
int tchan_cnt;
int echan_cnt;
int rchan_cnt;
@ -130,16 +151,6 @@ struct udma_dev {
u32 psil_base;
};
struct udma_hwdesc {
size_t cppi5_desc_size;
void *cppi5_desc_vaddr;
dma_addr_t cppi5_desc_paddr;
/* TR descriptor internal pointers */
void *tr_req_base;
struct cppi5_tr_resp_t *tr_resp_base;
};
struct udma_desc {
struct virt_dma_desc vd;
@ -169,7 +180,7 @@ enum udma_chan_state {
struct udma_tx_drain {
struct delayed_work work;
unsigned long jiffie;
ktime_t tstamp;
u32 residue;
};
@ -502,7 +513,7 @@ static bool udma_is_chan_paused(struct udma_chan *uc)
{
u32 val, pause_mask;
switch (uc->desc->dir) {
switch (uc->config.dir) {
case DMA_DEV_TO_MEM:
val = udma_rchanrt_read(uc->rchan,
UDMA_RCHAN_RT_PEER_RT_EN_REG);
@ -551,12 +562,17 @@ static void udma_sync_for_device(struct udma_chan *uc, int idx)
}
}
static inline dma_addr_t udma_get_rx_flush_hwdesc_paddr(struct udma_chan *uc)
{
return uc->ud->rx_flush.hwdescs[uc->config.pkt_mode].cppi5_desc_paddr;
}
static int udma_push_to_ring(struct udma_chan *uc, int idx)
{
struct udma_desc *d = uc->desc;
struct k3_ring *ring = NULL;
int ret = -EINVAL;
dma_addr_t paddr;
int ret;
switch (uc->config.dir) {
case DMA_DEV_TO_MEM:
@ -567,21 +583,37 @@ static int udma_push_to_ring(struct udma_chan *uc, int idx)
ring = uc->tchan->t_ring;
break;
default:
break;
return -EINVAL;
}
if (ring) {
dma_addr_t desc_addr = udma_curr_cppi5_desc_paddr(d, idx);
/* RX flush packet: idx == -1 is only passed in case of DEV_TO_MEM */
if (idx == -1) {
paddr = udma_get_rx_flush_hwdesc_paddr(uc);
} else {
paddr = udma_curr_cppi5_desc_paddr(d, idx);
wmb(); /* Ensure that writes are not moved over this point */
udma_sync_for_device(uc, idx);
ret = k3_ringacc_ring_push(ring, &desc_addr);
uc->in_ring_cnt++;
}
ret = k3_ringacc_ring_push(ring, &paddr);
if (!ret)
uc->in_ring_cnt++;
return ret;
}
static bool udma_desc_is_rx_flush(struct udma_chan *uc, dma_addr_t addr)
{
if (uc->config.dir != DMA_DEV_TO_MEM)
return false;
if (addr == udma_get_rx_flush_hwdesc_paddr(uc))
return true;
return false;
}
static int udma_pop_from_ring(struct udma_chan *uc, dma_addr_t *addr)
{
struct k3_ring *ring = NULL;
@ -610,6 +642,10 @@ static int udma_pop_from_ring(struct udma_chan *uc, dma_addr_t *addr)
if (cppi5_desc_is_tdcm(*addr))
return ret;
/* Check for flush descriptor */
if (udma_desc_is_rx_flush(uc, *addr))
return -ENOENT;
d = udma_udma_desc_from_paddr(uc, *addr);
if (d)
@ -890,6 +926,9 @@ static int udma_stop(struct udma_chan *uc)
switch (uc->config.dir) {
case DMA_DEV_TO_MEM:
if (!uc->cyclic && !uc->desc)
udma_push_to_ring(uc, -1);
udma_rchanrt_write(uc->rchan, UDMA_RCHAN_RT_PEER_RT_EN_REG,
UDMA_PEER_RT_EN_ENABLE |
UDMA_PEER_RT_EN_TEARDOWN);
@ -946,9 +985,10 @@ static bool udma_is_desc_really_done(struct udma_chan *uc, struct udma_desc *d)
peer_bcnt = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_PEER_BCNT_REG);
bcnt = udma_tchanrt_read(uc->tchan, UDMA_TCHAN_RT_BCNT_REG);
/* Transfer is incomplete, store current residue and time stamp */
if (peer_bcnt < bcnt) {
uc->tx_drain.residue = bcnt - peer_bcnt;
uc->tx_drain.jiffie = jiffies;
uc->tx_drain.tstamp = ktime_get();
return false;
}
@ -961,35 +1001,59 @@ static void udma_check_tx_completion(struct work_struct *work)
tx_drain.work.work);
bool desc_done = true;
u32 residue_diff;
unsigned long jiffie_diff, delay;
ktime_t time_diff;
unsigned long delay;
if (uc->desc) {
residue_diff = uc->tx_drain.residue;
jiffie_diff = uc->tx_drain.jiffie;
desc_done = udma_is_desc_really_done(uc, uc->desc);
}
if (!desc_done) {
jiffie_diff = uc->tx_drain.jiffie - jiffie_diff;
residue_diff -= uc->tx_drain.residue;
if (residue_diff) {
/* Try to guess when we should check next time */
residue_diff /= jiffie_diff;
delay = uc->tx_drain.residue / residue_diff / 3;
if (jiffies_to_msecs(delay) < 5)
delay = 0;
} else {
/* No progress, check again in 1 second */
delay = HZ;
while (1) {
if (uc->desc) {
/* Get previous residue and time stamp */
residue_diff = uc->tx_drain.residue;
time_diff = uc->tx_drain.tstamp;
/*
* Get current residue and time stamp or see if
* transfer is complete
*/
desc_done = udma_is_desc_really_done(uc, uc->desc);
}
schedule_delayed_work(&uc->tx_drain.work, delay);
} else if (uc->desc) {
struct udma_desc *d = uc->desc;
if (!desc_done) {
/*
* Find the time delta and residue delta w.r.t
* previous poll
*/
time_diff = ktime_sub(uc->tx_drain.tstamp,
time_diff) + 1;
residue_diff -= uc->tx_drain.residue;
if (residue_diff) {
/*
* Try to guess when we should check
* next time by calculating rate at
* which data is being drained at the
* peer device
*/
delay = (time_diff / residue_diff) *
uc->tx_drain.residue;
} else {
/* No progress, check again in 1 second */
schedule_delayed_work(&uc->tx_drain.work, HZ);
break;
}
uc->bcnt += d->residue;
udma_start(uc);
vchan_cookie_complete(&d->vd);
usleep_range(ktime_to_us(delay),
ktime_to_us(delay) + 10);
continue;
}
if (uc->desc) {
struct udma_desc *d = uc->desc;
uc->bcnt += d->residue;
udma_start(uc);
vchan_cookie_complete(&d->vd);
break;
}
break;
}
}
@ -1033,29 +1097,27 @@ static irqreturn_t udma_ring_irq_handler(int irq, void *data)
goto out;
}
if (uc->cyclic) {
/* push the descriptor back to the ring */
if (d == uc->desc) {
if (d == uc->desc) {
/* active descriptor */
if (uc->cyclic) {
udma_cyclic_packet_elapsed(uc);
vchan_cyclic_callback(&d->vd);
}
} else {
bool desc_done = false;
if (d == uc->desc) {
desc_done = udma_is_desc_really_done(uc, d);
if (desc_done) {
} else {
if (udma_is_desc_really_done(uc, d)) {
uc->bcnt += d->residue;
udma_start(uc);
vchan_cookie_complete(&d->vd);
} else {
schedule_delayed_work(&uc->tx_drain.work,
0);
}
}
if (desc_done)
vchan_cookie_complete(&d->vd);
} else {
/*
* terminated descriptor, mark the descriptor as
* completed to update the channel's cookie marker
*/
dma_cookie_complete(&d->vd.tx);
}
}
out:
@ -1965,36 +2027,81 @@ static struct udma_desc *udma_alloc_tr_desc(struct udma_chan *uc,
return d;
}
/**
* udma_get_tr_counters - calculate TR counters for a given length
* @len: Length of the trasnfer
* @align_to: Preferred alignment
* @tr0_cnt0: First TR icnt0
* @tr0_cnt1: First TR icnt1
* @tr1_cnt0: Second (if used) TR icnt0
*
* For len < SZ_64K only one TR is enough, tr1_cnt0 is not updated
* For len >= SZ_64K two TRs are used in a simple way:
* First TR: SZ_64K-alignment blocks (tr0_cnt0, tr0_cnt1)
* Second TR: the remaining length (tr1_cnt0)
*
* Returns the number of TRs the length needs (1 or 2)
* -EINVAL if the length can not be supported
*/
static int udma_get_tr_counters(size_t len, unsigned long align_to,
u16 *tr0_cnt0, u16 *tr0_cnt1, u16 *tr1_cnt0)
{
if (len < SZ_64K) {
*tr0_cnt0 = len;
*tr0_cnt1 = 1;
return 1;
}
if (align_to > 3)
align_to = 3;
realign:
*tr0_cnt0 = SZ_64K - BIT(align_to);
if (len / *tr0_cnt0 >= SZ_64K) {
if (align_to) {
align_to--;
goto realign;
}
return -EINVAL;
}
*tr0_cnt1 = len / *tr0_cnt0;
*tr1_cnt0 = len % *tr0_cnt0;
return 2;
}
static struct udma_desc *
udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
unsigned int sglen, enum dma_transfer_direction dir,
unsigned long tx_flags, void *context)
{
enum dma_slave_buswidth dev_width;
struct scatterlist *sgent;
struct udma_desc *d;
size_t tr_size;
struct cppi5_tr_type1_t *tr_req = NULL;
u16 tr0_cnt0, tr0_cnt1, tr1_cnt0;
unsigned int i;
u32 burst;
size_t tr_size;
int num_tr = 0;
int tr_idx = 0;
if (dir == DMA_DEV_TO_MEM) {
dev_width = uc->cfg.src_addr_width;
burst = uc->cfg.src_maxburst;
} else if (dir == DMA_MEM_TO_DEV) {
dev_width = uc->cfg.dst_addr_width;
burst = uc->cfg.dst_maxburst;
} else {
dev_err(uc->ud->dev, "%s: bad direction?\n", __func__);
if (!is_slave_direction(dir)) {
dev_err(uc->ud->dev, "Only slave cyclic is supported\n");
return NULL;
}
if (!burst)
burst = 1;
/* estimate the number of TRs we will need */
for_each_sg(sgl, sgent, sglen, i) {
if (sg_dma_len(sgent) < SZ_64K)
num_tr++;
else
num_tr += 2;
}
/* Now allocate and setup the descriptor. */
tr_size = sizeof(struct cppi5_tr_type1_t);
d = udma_alloc_tr_desc(uc, tr_size, sglen, dir);
d = udma_alloc_tr_desc(uc, tr_size, num_tr, dir);
if (!d)
return NULL;
@ -2002,19 +2109,46 @@ udma_prep_slave_sg_tr(struct udma_chan *uc, struct scatterlist *sgl,
tr_req = d->hwdesc[0].tr_req_base;
for_each_sg(sgl, sgent, sglen, i) {
d->residue += sg_dma_len(sgent);
dma_addr_t sg_addr = sg_dma_address(sgent);
num_tr = udma_get_tr_counters(sg_dma_len(sgent), __ffs(sg_addr),
&tr0_cnt0, &tr0_cnt1, &tr1_cnt0);
if (num_tr < 0) {
dev_err(uc->ud->dev, "size %u is not supported\n",
sg_dma_len(sgent));
udma_free_hwdesc(uc, d);
kfree(d);
return NULL;
}
cppi5_tr_init(&tr_req[i].flags, CPPI5_TR_TYPE1, false, false,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
cppi5_tr_csf_set(&tr_req[i].flags, CPPI5_TR_CSF_SUPR_EVT);
tr_req[i].addr = sg_dma_address(sgent);
tr_req[i].icnt0 = burst * dev_width;
tr_req[i].dim1 = burst * dev_width;
tr_req[i].icnt1 = sg_dma_len(sgent) / tr_req[i].icnt0;
tr_req[tr_idx].addr = sg_addr;
tr_req[tr_idx].icnt0 = tr0_cnt0;
tr_req[tr_idx].icnt1 = tr0_cnt1;
tr_req[tr_idx].dim1 = tr0_cnt0;
tr_idx++;
if (num_tr == 2) {
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE1,
false, false,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
cppi5_tr_csf_set(&tr_req[tr_idx].flags,
CPPI5_TR_CSF_SUPR_EVT);
tr_req[tr_idx].addr = sg_addr + tr0_cnt1 * tr0_cnt0;
tr_req[tr_idx].icnt0 = tr1_cnt0;
tr_req[tr_idx].icnt1 = 1;
tr_req[tr_idx].dim1 = tr1_cnt0;
tr_idx++;
}
d->residue += sg_dma_len(sgent);
}
cppi5_tr_csf_set(&tr_req[i - 1].flags, CPPI5_TR_CSF_EOP);
cppi5_tr_csf_set(&tr_req[tr_idx - 1].flags, CPPI5_TR_CSF_EOP);
return d;
}
@ -2319,47 +2453,66 @@ udma_prep_dma_cyclic_tr(struct udma_chan *uc, dma_addr_t buf_addr,
size_t buf_len, size_t period_len,
enum dma_transfer_direction dir, unsigned long flags)
{
enum dma_slave_buswidth dev_width;
struct udma_desc *d;
size_t tr_size;
size_t tr_size, period_addr;
struct cppi5_tr_type1_t *tr_req;
unsigned int i;
unsigned int periods = buf_len / period_len;
u32 burst;
u16 tr0_cnt0, tr0_cnt1, tr1_cnt0;
unsigned int i;
int num_tr;
if (dir == DMA_DEV_TO_MEM) {
dev_width = uc->cfg.src_addr_width;
burst = uc->cfg.src_maxburst;
} else if (dir == DMA_MEM_TO_DEV) {
dev_width = uc->cfg.dst_addr_width;
burst = uc->cfg.dst_maxburst;
} else {
dev_err(uc->ud->dev, "%s: bad direction?\n", __func__);
if (!is_slave_direction(dir)) {
dev_err(uc->ud->dev, "Only slave cyclic is supported\n");
return NULL;
}
if (!burst)
burst = 1;
num_tr = udma_get_tr_counters(period_len, __ffs(buf_addr), &tr0_cnt0,
&tr0_cnt1, &tr1_cnt0);
if (num_tr < 0) {
dev_err(uc->ud->dev, "size %zu is not supported\n",
period_len);
return NULL;
}
/* Now allocate and setup the descriptor. */
tr_size = sizeof(struct cppi5_tr_type1_t);
d = udma_alloc_tr_desc(uc, tr_size, periods, dir);
d = udma_alloc_tr_desc(uc, tr_size, periods * num_tr, dir);
if (!d)
return NULL;
tr_req = d->hwdesc[0].tr_req_base;
period_addr = buf_addr;
for (i = 0; i < periods; i++) {
cppi5_tr_init(&tr_req[i].flags, CPPI5_TR_TYPE1, false, false,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
int tr_idx = i * num_tr;
tr_req[i].addr = buf_addr + period_len * i;
tr_req[i].icnt0 = dev_width;
tr_req[i].icnt1 = period_len / dev_width;
tr_req[i].dim1 = dev_width;
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE1, false,
false, CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
tr_req[tr_idx].addr = period_addr;
tr_req[tr_idx].icnt0 = tr0_cnt0;
tr_req[tr_idx].icnt1 = tr0_cnt1;
tr_req[tr_idx].dim1 = tr0_cnt0;
if (num_tr == 2) {
cppi5_tr_csf_set(&tr_req[tr_idx].flags,
CPPI5_TR_CSF_SUPR_EVT);
tr_idx++;
cppi5_tr_init(&tr_req[tr_idx].flags, CPPI5_TR_TYPE1,
false, false,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
tr_req[tr_idx].addr = period_addr + tr0_cnt1 * tr0_cnt0;
tr_req[tr_idx].icnt0 = tr1_cnt0;
tr_req[tr_idx].icnt1 = 1;
tr_req[tr_idx].dim1 = tr1_cnt0;
}
if (!(flags & DMA_PREP_INTERRUPT))
cppi5_tr_csf_set(&tr_req[i].flags,
cppi5_tr_csf_set(&tr_req[tr_idx].flags,
CPPI5_TR_CSF_SUPR_EVT);
period_addr += period_len;
}
return d;
@ -2517,29 +2670,12 @@ udma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
return NULL;
}
if (len < SZ_64K) {
num_tr = 1;
tr0_cnt0 = len;
tr0_cnt1 = 1;
} else {
unsigned long align_to = __ffs(src | dest);
if (align_to > 3)
align_to = 3;
/*
* Keep simple: tr0: SZ_64K-alignment blocks,
* tr1: the remaining
*/
num_tr = 2;
tr0_cnt0 = (SZ_64K - BIT(align_to));
if (len / tr0_cnt0 >= SZ_64K) {
dev_err(uc->ud->dev, "size %zu is not supported\n",
len);
return NULL;
}
tr0_cnt1 = len / tr0_cnt0;
tr1_cnt0 = len % tr0_cnt0;
num_tr = udma_get_tr_counters(len, __ffs(src | dest), &tr0_cnt0,
&tr0_cnt1, &tr1_cnt0);
if (num_tr < 0) {
dev_err(uc->ud->dev, "size %zu is not supported\n",
len);
return NULL;
}
d = udma_alloc_tr_desc(uc, tr_size, num_tr, DMA_MEM_TO_MEM);
@ -2631,6 +2767,9 @@ static enum dma_status udma_tx_status(struct dma_chan *chan,
ret = dma_cookie_status(chan, cookie, txstate);
if (!udma_is_chan_running(uc))
ret = DMA_COMPLETE;
if (ret == DMA_IN_PROGRESS && udma_is_chan_paused(uc))
ret = DMA_PAUSED;
@ -2697,11 +2836,8 @@ static int udma_pause(struct dma_chan *chan)
{
struct udma_chan *uc = to_udma_chan(chan);
if (!uc->desc)
return -EINVAL;
/* pause the channel */
switch (uc->desc->dir) {
switch (uc->config.dir) {
case DMA_DEV_TO_MEM:
udma_rchanrt_update_bits(uc->rchan,
UDMA_RCHAN_RT_PEER_RT_EN_REG,
@ -2730,11 +2866,8 @@ static int udma_resume(struct dma_chan *chan)
{
struct udma_chan *uc = to_udma_chan(chan);
if (!uc->desc)
return -EINVAL;
/* resume the channel */
switch (uc->desc->dir) {
switch (uc->config.dir) {
case DMA_DEV_TO_MEM:
udma_rchanrt_update_bits(uc->rchan,
UDMA_RCHAN_RT_PEER_RT_EN_REG,
@ -3248,6 +3381,98 @@ static int udma_setup_resources(struct udma_dev *ud)
return ch_count;
}
static int udma_setup_rx_flush(struct udma_dev *ud)
{
struct udma_rx_flush *rx_flush = &ud->rx_flush;
struct cppi5_desc_hdr_t *tr_desc;
struct cppi5_tr_type1_t *tr_req;
struct cppi5_host_desc_t *desc;
struct device *dev = ud->dev;
struct udma_hwdesc *hwdesc;
size_t tr_size;
/* Allocate 1K buffer for discarded data on RX channel teardown */
rx_flush->buffer_size = SZ_1K;
rx_flush->buffer_vaddr = devm_kzalloc(dev, rx_flush->buffer_size,
GFP_KERNEL);
if (!rx_flush->buffer_vaddr)
return -ENOMEM;
rx_flush->buffer_paddr = dma_map_single(dev, rx_flush->buffer_vaddr,
rx_flush->buffer_size,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, rx_flush->buffer_paddr))
return -ENOMEM;
/* Set up descriptor to be used for TR mode */
hwdesc = &rx_flush->hwdescs[0];
tr_size = sizeof(struct cppi5_tr_type1_t);
hwdesc->cppi5_desc_size = cppi5_trdesc_calc_size(tr_size, 1);
hwdesc->cppi5_desc_size = ALIGN(hwdesc->cppi5_desc_size,
ud->desc_align);
hwdesc->cppi5_desc_vaddr = devm_kzalloc(dev, hwdesc->cppi5_desc_size,
GFP_KERNEL);
if (!hwdesc->cppi5_desc_vaddr)
return -ENOMEM;
hwdesc->cppi5_desc_paddr = dma_map_single(dev, hwdesc->cppi5_desc_vaddr,
hwdesc->cppi5_desc_size,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, hwdesc->cppi5_desc_paddr))
return -ENOMEM;
/* Start of the TR req records */
hwdesc->tr_req_base = hwdesc->cppi5_desc_vaddr + tr_size;
/* Start address of the TR response array */
hwdesc->tr_resp_base = hwdesc->tr_req_base + tr_size;
tr_desc = hwdesc->cppi5_desc_vaddr;
cppi5_trdesc_init(tr_desc, 1, tr_size, 0, 0);
cppi5_desc_set_pktids(tr_desc, 0, CPPI5_INFO1_DESC_FLOWID_DEFAULT);
cppi5_desc_set_retpolicy(tr_desc, 0, 0);
tr_req = hwdesc->tr_req_base;
cppi5_tr_init(&tr_req->flags, CPPI5_TR_TYPE1, false, false,
CPPI5_TR_EVENT_SIZE_COMPLETION, 0);
cppi5_tr_csf_set(&tr_req->flags, CPPI5_TR_CSF_SUPR_EVT);
tr_req->addr = rx_flush->buffer_paddr;
tr_req->icnt0 = rx_flush->buffer_size;
tr_req->icnt1 = 1;
/* Set up descriptor to be used for packet mode */
hwdesc = &rx_flush->hwdescs[1];
hwdesc->cppi5_desc_size = ALIGN(sizeof(struct cppi5_host_desc_t) +
CPPI5_INFO0_HDESC_EPIB_SIZE +
CPPI5_INFO0_HDESC_PSDATA_MAX_SIZE,
ud->desc_align);
hwdesc->cppi5_desc_vaddr = devm_kzalloc(dev, hwdesc->cppi5_desc_size,
GFP_KERNEL);
if (!hwdesc->cppi5_desc_vaddr)
return -ENOMEM;
hwdesc->cppi5_desc_paddr = dma_map_single(dev, hwdesc->cppi5_desc_vaddr,
hwdesc->cppi5_desc_size,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, hwdesc->cppi5_desc_paddr))
return -ENOMEM;
desc = hwdesc->cppi5_desc_vaddr;
cppi5_hdesc_init(desc, 0, 0);
cppi5_desc_set_pktids(&desc->hdr, 0, CPPI5_INFO1_DESC_FLOWID_DEFAULT);
cppi5_desc_set_retpolicy(&desc->hdr, 0, 0);
cppi5_hdesc_attach_buf(desc,
rx_flush->buffer_paddr, rx_flush->buffer_size,
rx_flush->buffer_paddr, rx_flush->buffer_size);
dma_sync_single_for_device(dev, hwdesc->cppi5_desc_paddr,
hwdesc->cppi5_desc_size, DMA_TO_DEVICE);
return 0;
}
#define TI_UDMAC_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
@ -3361,6 +3586,10 @@ static int udma_probe(struct platform_device *pdev)
if (ud->desc_align < dma_get_cache_alignment())
ud->desc_align = dma_get_cache_alignment();
ret = udma_setup_rx_flush(ud);
if (ret)
return ret;
for (i = 0; i < ud->tchan_cnt; i++) {
struct udma_tchan *tchan = &ud->tchans[i];