6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Arnd Bergmann arnd@arndb.de
commit 58ac1b3799799069d53f5bf95c093f2fe8dd3cc5 upstream.
Since there is no guarantee that the memory returned by dma_alloc_coherent() is associated with a 'struct page', using the architecture specific phys_to_page() is wrong, but using virt_to_page() would be as well.
Stop using sg lists altogether and just use the *_single() functions instead. This also simplifies the code a bit since the scatterlists in this driver always have only one entry anyway.
https://lore.kernel.org/lkml/86db0fe5-930d-4cbb-bd7d-03367da38951@app.fastma... Use consistent names for dma buffers
gc: Add a commit log from the initial thread: https://lore.kernel.org/lkml/86db0fe5-930d-4cbb-bd7d-03367da38951@app.fastma... Use consistent names for dma buffers
Fixes: cb06ff102e2d7 ("ARM: PL011: Add support for Rx DMA buffer polling.") Signed-off-by: Arnd Bergmann arnd@arndb.de Tested-by: Gregory CLEMENT gregory.clement@bootlin.com Signed-off-by: Gregory CLEMENT gregory.clement@bootlin.com Cc: stable stable@kernel.org Link: https://lore.kernel.org/r/20231122171503.235649-1-gregory.clement@bootlin.co... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/amba-pl011.c | 112 +++++++++++++++++++--------------------- 1 file changed, 54 insertions(+), 58 deletions(-)
--- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -218,17 +218,18 @@ static struct vendor_data vendor_st = {
/* Deals with DMA transactions */
-struct pl011_sgbuf { - struct scatterlist sg; - char *buf; +struct pl011_dmabuf { + dma_addr_t dma; + size_t len; + char *buf; };
struct pl011_dmarx_data { struct dma_chan *chan; struct completion complete; bool use_buf_b; - struct pl011_sgbuf sgbuf_a; - struct pl011_sgbuf sgbuf_b; + struct pl011_dmabuf dbuf_a; + struct pl011_dmabuf dbuf_b; dma_cookie_t cookie; bool running; struct timer_list timer; @@ -241,7 +242,8 @@ struct pl011_dmarx_data {
struct pl011_dmatx_data { struct dma_chan *chan; - struct scatterlist sg; + dma_addr_t dma; + size_t len; char *buf; bool queued; }; @@ -366,32 +368,24 @@ static int pl011_fifo_to_tty(struct uart
#define PL011_DMA_BUFFER_SIZE PAGE_SIZE
-static int pl011_sgbuf_init(struct dma_chan *chan, struct pl011_sgbuf *sg, +static int pl011_dmabuf_init(struct dma_chan *chan, struct pl011_dmabuf *db, enum dma_data_direction dir) { - dma_addr_t dma_addr; - - sg->buf = dma_alloc_coherent(chan->device->dev, - PL011_DMA_BUFFER_SIZE, &dma_addr, GFP_KERNEL); - if (!sg->buf) + db->buf = dma_alloc_coherent(chan->device->dev, PL011_DMA_BUFFER_SIZE, + &db->dma, GFP_KERNEL); + if (!db->buf) return -ENOMEM; - - sg_init_table(&sg->sg, 1); - sg_set_page(&sg->sg, phys_to_page(dma_addr), - PL011_DMA_BUFFER_SIZE, offset_in_page(dma_addr)); - sg_dma_address(&sg->sg) = dma_addr; - sg_dma_len(&sg->sg) = PL011_DMA_BUFFER_SIZE; + db->len = PL011_DMA_BUFFER_SIZE;
return 0; }
-static void pl011_sgbuf_free(struct dma_chan *chan, struct pl011_sgbuf *sg, +static void pl011_dmabuf_free(struct dma_chan *chan, struct pl011_dmabuf *db, enum dma_data_direction dir) { - if (sg->buf) { + if (db->buf) { dma_free_coherent(chan->device->dev, - PL011_DMA_BUFFER_SIZE, sg->buf, - sg_dma_address(&sg->sg)); + PL011_DMA_BUFFER_SIZE, db->buf, db->dma); } }
@@ -552,8 +546,8 @@ static void pl011_dma_tx_callback(void *
spin_lock_irqsave(&uap->port.lock, flags); if (uap->dmatx.queued) - dma_unmap_sg(dmatx->chan->device->dev, &dmatx->sg, 1, - DMA_TO_DEVICE); + dma_unmap_single(dmatx->chan->device->dev, dmatx->dma, + dmatx->len, DMA_TO_DEVICE);
dmacr = uap->dmacr; uap->dmacr = dmacr & ~UART011_TXDMAE; @@ -639,18 +633,19 @@ static int pl011_dma_tx_refill(struct ua memcpy(&dmatx->buf[first], &xmit->buf[0], second); }
- dmatx->sg.length = count; - - if (dma_map_sg(dma_dev->dev, &dmatx->sg, 1, DMA_TO_DEVICE) != 1) { + dmatx->len = count; + dmatx->dma = dma_map_single(dma_dev->dev, dmatx->buf, count, + DMA_TO_DEVICE); + if (dmatx->dma == DMA_MAPPING_ERROR) { uap->dmatx.queued = false; dev_dbg(uap->port.dev, "unable to map TX DMA\n"); return -EBUSY; }
- desc = dmaengine_prep_slave_sg(chan, &dmatx->sg, 1, DMA_MEM_TO_DEV, + desc = dmaengine_prep_slave_single(chan, dmatx->dma, dmatx->len, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { - dma_unmap_sg(dma_dev->dev, &dmatx->sg, 1, DMA_TO_DEVICE); + dma_unmap_single(dma_dev->dev, dmatx->dma, dmatx->len, DMA_TO_DEVICE); uap->dmatx.queued = false; /* * If DMA cannot be used right now, we complete this @@ -813,8 +808,8 @@ __acquires(&uap->port.lock) dmaengine_terminate_async(uap->dmatx.chan);
if (uap->dmatx.queued) { - dma_unmap_sg(uap->dmatx.chan->device->dev, &uap->dmatx.sg, 1, - DMA_TO_DEVICE); + dma_unmap_single(uap->dmatx.chan->device->dev, uap->dmatx.dma, + uap->dmatx.len, DMA_TO_DEVICE); uap->dmatx.queued = false; uap->dmacr &= ~UART011_TXDMAE; pl011_write(uap->dmacr, uap, REG_DMACR); @@ -828,15 +823,15 @@ static int pl011_dma_rx_trigger_dma(stru struct dma_chan *rxchan = uap->dmarx.chan; struct pl011_dmarx_data *dmarx = &uap->dmarx; struct dma_async_tx_descriptor *desc; - struct pl011_sgbuf *sgbuf; + struct pl011_dmabuf *dbuf;
if (!rxchan) return -EIO;
/* Start the RX DMA job */ - sgbuf = uap->dmarx.use_buf_b ? - &uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a; - desc = dmaengine_prep_slave_sg(rxchan, &sgbuf->sg, 1, + dbuf = uap->dmarx.use_buf_b ? + &uap->dmarx.dbuf_b : &uap->dmarx.dbuf_a; + desc = dmaengine_prep_slave_single(rxchan, dbuf->dma, dbuf->len, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); /* @@ -876,8 +871,8 @@ static void pl011_dma_rx_chars(struct ua bool readfifo) { struct tty_port *port = &uap->port.state->port; - struct pl011_sgbuf *sgbuf = use_buf_b ? - &uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a; + struct pl011_dmabuf *dbuf = use_buf_b ? + &uap->dmarx.dbuf_b : &uap->dmarx.dbuf_a; int dma_count = 0; u32 fifotaken = 0; /* only used for vdbg() */
@@ -886,7 +881,7 @@ static void pl011_dma_rx_chars(struct ua
if (uap->dmarx.poll_rate) { /* The data can be taken by polling */ - dmataken = sgbuf->sg.length - dmarx->last_residue; + dmataken = dbuf->len - dmarx->last_residue; /* Recalculate the pending size */ if (pending >= dmataken) pending -= dmataken; @@ -900,7 +895,7 @@ static void pl011_dma_rx_chars(struct ua * Note that tty_insert_flip_buf() tries to take as many chars * as it can. */ - dma_count = tty_insert_flip_string(port, sgbuf->buf + dmataken, + dma_count = tty_insert_flip_string(port, dbuf->buf + dmataken, pending);
uap->port.icount.rx += dma_count; @@ -911,7 +906,7 @@ static void pl011_dma_rx_chars(struct ua
/* Reset the last_residue for Rx DMA poll */ if (uap->dmarx.poll_rate) - dmarx->last_residue = sgbuf->sg.length; + dmarx->last_residue = dbuf->len;
/* * Only continue with trying to read the FIFO if all DMA chars have @@ -946,8 +941,8 @@ static void pl011_dma_rx_irq(struct uart { struct pl011_dmarx_data *dmarx = &uap->dmarx; struct dma_chan *rxchan = dmarx->chan; - struct pl011_sgbuf *sgbuf = dmarx->use_buf_b ? - &dmarx->sgbuf_b : &dmarx->sgbuf_a; + struct pl011_dmabuf *dbuf = dmarx->use_buf_b ? + &dmarx->dbuf_b : &dmarx->dbuf_a; size_t pending; struct dma_tx_state state; enum dma_status dmastat; @@ -969,7 +964,7 @@ static void pl011_dma_rx_irq(struct uart pl011_write(uap->dmacr, uap, REG_DMACR); uap->dmarx.running = false;
- pending = sgbuf->sg.length - state.residue; + pending = dbuf->len - state.residue; BUG_ON(pending > PL011_DMA_BUFFER_SIZE); /* Then we terminate the transfer - we now know our residue */ dmaengine_terminate_all(rxchan); @@ -996,8 +991,8 @@ static void pl011_dma_rx_callback(void * struct pl011_dmarx_data *dmarx = &uap->dmarx; struct dma_chan *rxchan = dmarx->chan; bool lastbuf = dmarx->use_buf_b; - struct pl011_sgbuf *sgbuf = dmarx->use_buf_b ? - &dmarx->sgbuf_b : &dmarx->sgbuf_a; + struct pl011_dmabuf *dbuf = dmarx->use_buf_b ? + &dmarx->dbuf_b : &dmarx->dbuf_a; size_t pending; struct dma_tx_state state; int ret; @@ -1015,7 +1010,7 @@ static void pl011_dma_rx_callback(void * * the DMA irq handler. So we check the residue here. */ rxchan->device->device_tx_status(rxchan, dmarx->cookie, &state); - pending = sgbuf->sg.length - state.residue; + pending = dbuf->len - state.residue; BUG_ON(pending > PL011_DMA_BUFFER_SIZE); /* Then we terminate the transfer - we now know our residue */ dmaengine_terminate_all(rxchan); @@ -1067,16 +1062,16 @@ static void pl011_dma_rx_poll(struct tim unsigned long flags; unsigned int dmataken = 0; unsigned int size = 0; - struct pl011_sgbuf *sgbuf; + struct pl011_dmabuf *dbuf; int dma_count; struct dma_tx_state state;
- sgbuf = dmarx->use_buf_b ? &uap->dmarx.sgbuf_b : &uap->dmarx.sgbuf_a; + dbuf = dmarx->use_buf_b ? &uap->dmarx.dbuf_b : &uap->dmarx.dbuf_a; rxchan->device->device_tx_status(rxchan, dmarx->cookie, &state); if (likely(state.residue < dmarx->last_residue)) { - dmataken = sgbuf->sg.length - dmarx->last_residue; + dmataken = dbuf->len - dmarx->last_residue; size = dmarx->last_residue - state.residue; - dma_count = tty_insert_flip_string(port, sgbuf->buf + dmataken, + dma_count = tty_insert_flip_string(port, dbuf->buf + dmataken, size); if (dma_count == size) dmarx->last_residue = state.residue; @@ -1123,7 +1118,7 @@ static void pl011_dma_startup(struct uar return; }
- sg_init_one(&uap->dmatx.sg, uap->dmatx.buf, PL011_DMA_BUFFER_SIZE); + uap->dmatx.len = PL011_DMA_BUFFER_SIZE;
/* The DMA buffer is now the FIFO the TTY subsystem can use */ uap->port.fifosize = PL011_DMA_BUFFER_SIZE; @@ -1133,7 +1128,7 @@ static void pl011_dma_startup(struct uar goto skip_rx;
/* Allocate and map DMA RX buffers */ - ret = pl011_sgbuf_init(uap->dmarx.chan, &uap->dmarx.sgbuf_a, + ret = pl011_dmabuf_init(uap->dmarx.chan, &uap->dmarx.dbuf_a, DMA_FROM_DEVICE); if (ret) { dev_err(uap->port.dev, "failed to init DMA %s: %d\n", @@ -1141,12 +1136,12 @@ static void pl011_dma_startup(struct uar goto skip_rx; }
- ret = pl011_sgbuf_init(uap->dmarx.chan, &uap->dmarx.sgbuf_b, + ret = pl011_dmabuf_init(uap->dmarx.chan, &uap->dmarx.dbuf_b, DMA_FROM_DEVICE); if (ret) { dev_err(uap->port.dev, "failed to init DMA %s: %d\n", "RX buffer B", ret); - pl011_sgbuf_free(uap->dmarx.chan, &uap->dmarx.sgbuf_a, + pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_a, DMA_FROM_DEVICE); goto skip_rx; } @@ -1200,8 +1195,9 @@ static void pl011_dma_shutdown(struct ua /* In theory, this should already be done by pl011_dma_flush_buffer */ dmaengine_terminate_all(uap->dmatx.chan); if (uap->dmatx.queued) { - dma_unmap_sg(uap->dmatx.chan->device->dev, &uap->dmatx.sg, 1, - DMA_TO_DEVICE); + dma_unmap_single(uap->dmatx.chan->device->dev, + uap->dmatx.dma, uap->dmatx.len, + DMA_TO_DEVICE); uap->dmatx.queued = false; }
@@ -1212,8 +1208,8 @@ static void pl011_dma_shutdown(struct ua if (uap->using_rx_dma) { dmaengine_terminate_all(uap->dmarx.chan); /* Clean up the RX DMA */ - pl011_sgbuf_free(uap->dmarx.chan, &uap->dmarx.sgbuf_a, DMA_FROM_DEVICE); - pl011_sgbuf_free(uap->dmarx.chan, &uap->dmarx.sgbuf_b, DMA_FROM_DEVICE); + pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_a, DMA_FROM_DEVICE); + pl011_dmabuf_free(uap->dmarx.chan, &uap->dmarx.dbuf_b, DMA_FROM_DEVICE); if (uap->dmarx.poll_rate) del_timer_sync(&uap->dmarx.timer); uap->using_rx_dma = false;