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Avoid using the bounce buffer when the source or destination buffer is

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32-bits aligned. Merge the two bounce buffers into a single one. Some
rough tests showed that the DWC OTG throughput on RPI2 increased by
10% after this patch.

MFC after:	1 week
This commit is contained in:
Hans Petter Selasky 2015-11-08 09:37:26 +00:00
parent bee75f52d1
commit c2472ff8fb
2 changed files with 143 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

174
sys/dev/usb/controller/dwc_otg.c
View File

@ -180,6 +180,110 @@ dwc_otg_get_hw_ep_profile(struct usb_device *udev,
*ppf = NULL;
}
static void
dwc_otg_write_fifo(struct dwc_otg_softc *sc, struct usb_page_cache *pc,
uint32_t offset, uint32_t fifo, uint32_t count)
{
uint32_t temp;
/* round down length to nearest 4-bytes */
temp = count & ~3;
/* check if we can write the data directly */
if (temp != 0 && usb_pc_buffer_is_aligned(pc, offset, temp, 3)) {
struct usb_page_search buf_res;
/* pre-subtract length */
count -= temp;
/* iterate buffer list */
do {
/* get current buffer pointer */
usbd_get_page(pc, offset, &buf_res);
if (buf_res.length > temp)
buf_res.length = temp;
/* transfer data into FIFO */
bus_space_write_region_4(sc->sc_io_tag, sc->sc_io_hdl,
fifo, buf_res.buffer, buf_res.length / 4);
offset += buf_res.length;
fifo += buf_res.length;
temp -= buf_res.length;
} while (temp != 0);
}
/* check for remainder */
if (count != 0) {
/* clear topmost word before copy */
sc->sc_bounce_buffer[(count - 1) / 4] = 0;
/* copy out data */
usbd_copy_out(pc, offset,
sc->sc_bounce_buffer, count);
/* transfer data into FIFO */
bus_space_write_region_4(sc->sc_io_tag,
sc->sc_io_hdl, fifo, sc->sc_bounce_buffer,
(count + 3) / 4);
}
}
static void
dwc_otg_read_fifo(struct dwc_otg_softc *sc, struct usb_page_cache *pc,
uint32_t offset, uint32_t count)
{
uint32_t temp;
/* round down length to nearest 4-bytes */
temp = count & ~3;
/* check if we can read the data directly */
if (temp != 0 && usb_pc_buffer_is_aligned(pc, offset, temp, 3)) {
struct usb_page_search buf_res;
/* pre-subtract length */
count -= temp;
/* iterate buffer list */
do {
/* get current buffer pointer */
usbd_get_page(pc, offset, &buf_res);
if (buf_res.length > temp)
buf_res.length = temp;
/* transfer data from FIFO */
bus_space_read_region_4(sc->sc_io_tag, sc->sc_io_hdl,
sc->sc_current_rx_fifo, buf_res.buffer, buf_res.length / 4);
offset += buf_res.length;
sc->sc_current_rx_fifo += buf_res.length;
sc->sc_current_rx_bytes -= buf_res.length;
temp -= buf_res.length;
} while (temp != 0);
}
/* check for remainder */
if (count != 0) {
/* read data into bounce buffer */
bus_space_read_region_4(sc->sc_io_tag, sc->sc_io_hdl,
sc->sc_current_rx_fifo,
sc->sc_bounce_buffer, (count + 3) / 4);
/* store data into proper buffer */
usbd_copy_in(pc, offset, sc->sc_bounce_buffer, count);
/* round length up to nearest 4 bytes */
count = (count + 3) & ~3;
/* update counters */
sc->sc_current_rx_bytes -= count;
sc->sc_current_rx_fifo += count;
}
}
static void
dwc_otg_tx_fifo_reset(struct dwc_otg_softc *sc, uint32_t value)
{
@ -579,6 +683,14 @@ dwc_otg_common_rx_ack(struct dwc_otg_softc *sc)
sc->sc_irq_mask |= GINTMSK_RXFLVLMSK;
DWC_OTG_WRITE_4(sc, DOTG_GINTMSK, sc->sc_irq_mask);
if (sc->sc_current_rx_bytes != 0) {
/* need to dump remaining data */
bus_space_read_region_4(sc->sc_io_tag, sc->sc_io_hdl,
sc->sc_current_rx_fifo, sc->sc_bounce_buffer,
sc->sc_current_rx_bytes / 4);
/* clear number of active bytes to receive */
sc->sc_current_rx_bytes = 0;
}
/* clear cached status */
sc->sc_last_rx_status = 0;
}
@ -761,6 +873,7 @@ dwc_otg_host_dump_rx(struct dwc_otg_softc *sc, struct dwc_otg_td *td)
td->channel[x] != GRXSTSRD_CHNUM_GET(sc->sc_last_rx_status))
continue;
dwc_otg_common_rx_ack(sc);
break;
}
}
@ -898,6 +1011,7 @@ dwc_otg_host_setup_tx(struct dwc_otg_softc *sc, struct dwc_otg_td *td)
td->state = DWC_CHAN_ST_WAIT_ANE;
}
/* copy out control request */
usbd_copy_out(td->pc, 0, &req, sizeof(req));
DWC_OTG_WRITE_4(sc, DOTG_HCTSIZ(td->channel[0]),
@ -1024,11 +1138,11 @@ dwc_otg_setup_rx(struct dwc_otg_softc *sc, struct dwc_otg_td *td)
goto not_complete;
}
/* copy in control request */
memcpy(&req, sc->sc_rx_bounce_buffer, sizeof(req));
/* read FIFO */
dwc_otg_read_fifo(sc, td->pc, 0, sizeof(req));
/* copy data into real buffer */
usbd_copy_in(td->pc, 0, &req, sizeof(req));
/* copy out control request */
usbd_copy_out(td->pc, 0, &req, sizeof(req));
td->offset = sizeof(req);
td->remainder = 0;
@ -1212,8 +1326,8 @@ dwc_otg_host_data_rx_sub(struct dwc_otg_softc *sc, struct dwc_otg_td *td,
goto complete;
}
usbd_copy_in(td->pc, td->offset,
sc->sc_rx_bounce_buffer, count);
/* read data from FIFO */
dwc_otg_read_fifo(sc, td->pc, td->offset, count);
td->remainder -= count;
td->offset += count;
@ -1583,7 +1697,9 @@ dwc_otg_data_rx(struct dwc_otg_softc *sc, struct dwc_otg_td *td)
return (0); /* we are complete */
}
usbd_copy_in(td->pc, td->offset, sc->sc_rx_bounce_buffer, count);
/* read data from FIFO */
dwc_otg_read_fifo(sc, td->pc, td->offset, count);
td->remainder -= count;
td->offset += count;
@ -1904,17 +2020,9 @@ dwc_otg_host_data_tx(struct dwc_otg_softc *sc, struct dwc_otg_td *td)
DWC_OTG_WRITE_4(sc, DOTG_HCCHAR(channel), hcchar);
if (count != 0) {
/* clear topmost word before copy */
sc->sc_tx_bounce_buffer[(count - 1) / 4] = 0;
/* copy out data */
usbd_copy_out(td->pc, td->offset + td->tx_bytes,
sc->sc_tx_bounce_buffer, count);
/* transfer data into FIFO */
bus_space_write_region_4(sc->sc_io_tag, sc->sc_io_hdl,
DOTG_DFIFO(channel),
sc->sc_tx_bounce_buffer, (count + 3) / 4);
/* write data into FIFO */
dwc_otg_write_fifo(sc, td->pc, td->offset +
td->tx_bytes, DOTG_DFIFO(channel), count);
}
/* store number of bytes transmitted */
@ -2054,18 +2162,9 @@ dwc_otg_data_tx(struct dwc_otg_softc *sc, struct dwc_otg_td *td)
count = fifo_left;
if (count != 0) {
/* clear topmost word before copy */
sc->sc_tx_bounce_buffer[(count - 1) / 4] = 0;
/* copy out data */
usbd_copy_out(td->pc, td->offset,
sc->sc_tx_bounce_buffer, count);
/* transfer data into FIFO */
bus_space_write_region_4(sc->sc_io_tag, sc->sc_io_hdl,
DOTG_DFIFO(td->ep_no),
sc->sc_tx_bounce_buffer, (count + 3) / 4);
/* write data into FIFO */
dwc_otg_write_fifo(sc, td->pc, td->offset,
DOTG_DFIFO(td->ep_no), count);
td->tx_bytes -= count;
td->remainder -= count;
@ -2616,6 +2715,11 @@ dwc_otg_interrupt_poll_locked(struct dwc_otg_softc *sc)
sc->sc_chan_state[ep_no].wait_halted = 0;
DPRINTFN(5, "channel halt complete ch=%u\n", ep_no);
}
/* store bytes and FIFO offset */
sc->sc_current_rx_bytes = 0;
sc->sc_current_rx_fifo = 0;
/* acknowledge status */
dwc_otg_common_rx_ack(sc);
goto repeat;
}
@ -2625,13 +2729,11 @@ dwc_otg_interrupt_poll_locked(struct dwc_otg_softc *sc)
ep_no = GRXSTSRD_CHNUM_GET(
sc->sc_last_rx_status);
/* receive data, if any */
if (temp != 0) {
/* store bytes and FIFO offset */
sc->sc_current_rx_bytes = (temp + 3) & ~3;
sc->sc_current_rx_fifo = DOTG_DFIFO(ep_no);
DPRINTF("Reading %d bytes from ep %d\n", temp, ep_no);
bus_space_read_region_4(sc->sc_io_tag, sc->sc_io_hdl,
DOTG_DFIFO(ep_no),
sc->sc_rx_bounce_buffer, (temp + 3) / 4);
}
/* check if we should dump the data */
if (!(sc->sc_active_rx_ep & (1U << ep_no))) {

6
sys/dev/usb/controller/dwc_otg.h
View File

@ -173,8 +173,7 @@ struct dwc_otg_softc {
bus_space_tag_t sc_io_tag;
bus_space_handle_t sc_io_hdl;
uint32_t sc_rx_bounce_buffer[1024 / 4];
uint32_t sc_tx_bounce_buffer[MAX(512 * DWC_OTG_MAX_TXP, 1024) / 4];
uint32_t sc_bounce_buffer[MAX(512 * DWC_OTG_MAX_TXP, 1024) / 4];
uint32_t sc_fifo_size;
uint32_t sc_irq_mask;
@ -186,6 +185,9 @@ struct dwc_otg_softc {
uint32_t sc_hprt_val;
uint32_t sc_xfer_complete;
uint16_t sc_current_rx_bytes;
uint16_t sc_current_rx_fifo;
uint16_t sc_active_rx_ep;
uint16_t sc_last_frame_num;