From 61a87adf2e7b410da8e41799c61c21a7b8c8b001 Mon Sep 17 00:00:00 2001 From: David Kubicek Date: Tue, 1 Nov 2005 18:51:34 +0100 Subject: [PATCH] USB: Converting cdc acm to a ring queue this patch by David converts the sending queue of the CDC ACM driver to a queue of URBs. This is needed for quicker devices. Please apply. Signed-Off-By: Oliver Neukum Signed-off-by: Greg Kroah-Hartman drivers/usb/class/cdc-acm.c | 229 ++++++++++++++++++++++++++++++-------------- drivers/usb/class/cdc-acm.h | 33 +++++- 2 files changed, 185 insertions(+), 77 deletions(-) --- drivers/usb/class/cdc-acm.c | 227 ++++++++++++++++++++++++++++++-------------- 1 file changed, 156 insertions(+), 71 deletions(-) (limited to 'drivers/usb/class/cdc-acm.c') diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 1b475141297..72936dc15ec 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -6,6 +6,7 @@ * Copyright (c) 1999 Johannes Erdfelt * Copyright (c) 2000 Vojtech Pavlik * Copyright (c) 2004 Oliver Neukum + * Copyright (c) 2005 David Kubicek * * USB Abstract Control Model driver for USB modems and ISDN adapters * @@ -29,6 +30,7 @@ * config we want, sysadmin changes bConfigurationValue in sysfs. * v0.23 - use softirq for rx processing, as needed by tty layer * v0.24 - change probe method to evaluate CDC union descriptor + * v0.25 - downstream tasks paralelized to maximize throughput */ /* @@ -63,14 +65,15 @@ #include #include #include +#include #include "cdc-acm.h" /* * Version Information */ -#define DRIVER_VERSION "v0.23" -#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik" +#define DRIVER_VERSION "v0.25" +#define DRIVER_AUTHOR "Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek" #define DRIVER_DESC "USB Abstract Control Model driver for USB modems and ISDN adapters" static struct usb_driver acm_driver; @@ -284,7 +287,9 @@ exit: /* data interface returns incoming bytes, or we got unthrottled */ static void acm_read_bulk(struct urb *urb, struct pt_regs *regs) { - struct acm *acm = urb->context; + struct acm_rb *buf; + struct acm_ru *rcv = urb->context; + struct acm *acm = rcv->instance; dbg("Entering acm_read_bulk with status %d\n", urb->status); if (!ACM_READY(acm)) @@ -293,49 +298,109 @@ static void acm_read_bulk(struct urb *urb, struct pt_regs *regs) if (urb->status) dev_dbg(&acm->data->dev, "bulk rx status %d\n", urb->status); - /* calling tty_flip_buffer_push() in_irq() isn't allowed */ - tasklet_schedule(&acm->bh); + buf = rcv->buffer; + buf->size = urb->actual_length; + + spin_lock(&acm->read_lock); + list_add_tail(&rcv->list, &acm->spare_read_urbs); + list_add_tail(&buf->list, &acm->filled_read_bufs); + spin_unlock(&acm->read_lock); + + tasklet_schedule(&acm->urb_task); } static void acm_rx_tasklet(unsigned long _acm) { struct acm *acm = (void *)_acm; - struct urb *urb = acm->readurb; + struct acm_rb *buf; struct tty_struct *tty = acm->tty; - unsigned char *data = urb->transfer_buffer; + struct acm_ru *rcv; + //unsigned long flags; int i = 0; dbg("Entering acm_rx_tasklet"); - if (urb->actual_length > 0 && !acm->throttle) { - for (i = 0; i < urb->actual_length && !acm->throttle; i++) { - /* if we insert more than TTY_FLIPBUF_SIZE characters, - * we drop them. */ - if (tty->flip.count >= TTY_FLIPBUF_SIZE) { - tty_flip_buffer_push(tty); - } - tty_insert_flip_char(tty, data[i], 0); - } - dbg("Handed %d bytes to tty layer", i+1); - tty_flip_buffer_push(tty); + if (!ACM_READY(acm) || acm->throttle) + return; + +next_buffer: + spin_lock(&acm->read_lock); + if (list_empty(&acm->filled_read_bufs)) { + spin_unlock(&acm->read_lock); + goto urbs; } + buf = list_entry(acm->filled_read_bufs.next, + struct acm_rb, list); + list_del(&buf->list); + spin_unlock(&acm->read_lock); + + dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d\n", buf, buf->size); + + for (i = 0; i < buf->size && !acm->throttle; i++) { + /* if we insert more than TTY_FLIPBUF_SIZE characters, + we drop them. */ + if (tty->flip.count >= TTY_FLIPBUF_SIZE) { + tty_flip_buffer_push(tty); + } + tty_insert_flip_char(tty, buf->base[i], 0); + } + tty_flip_buffer_push(tty); spin_lock(&acm->throttle_lock); if (acm->throttle) { dbg("Throtteling noticed"); - memmove(data, data + i, urb->actual_length - i); - urb->actual_length -= i; - acm->resubmit_to_unthrottle = 1; + memmove(buf->base, buf->base + i, buf->size - i); + buf->size -= i; spin_unlock(&acm->throttle_lock); + spin_lock(&acm->read_lock); + list_add(&buf->list, &acm->filled_read_bufs); + spin_unlock(&acm->read_lock); return; } spin_unlock(&acm->throttle_lock); - urb->actual_length = 0; - urb->dev = acm->dev; - - i = usb_submit_urb(urb, GFP_ATOMIC); - if (i) - dev_dbg(&acm->data->dev, "bulk rx resubmit %d\n", i); + spin_lock(&acm->read_lock); + list_add(&buf->list, &acm->spare_read_bufs); + spin_unlock(&acm->read_lock); + goto next_buffer; + +urbs: + while (!list_empty(&acm->spare_read_bufs)) { + spin_lock(&acm->read_lock); + if (list_empty(&acm->spare_read_urbs)) { + spin_unlock(&acm->read_lock); + return; + } + rcv = list_entry(acm->spare_read_urbs.next, + struct acm_ru, list); + list_del(&rcv->list); + spin_unlock(&acm->read_lock); + + buf = list_entry(acm->spare_read_bufs.next, + struct acm_rb, list); + list_del(&buf->list); + + rcv->buffer = buf; + + usb_fill_bulk_urb(rcv->urb, acm->dev, + acm->rx_endpoint, + buf->base, + acm->readsize, + acm_read_bulk, rcv); + rcv->urb->transfer_dma = buf->dma; + rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p\n", rcv->urb, rcv, buf); + + /* This shouldn't kill the driver as unsuccessful URBs are returned to the + free-urbs-pool and resubmited ASAP */ + if (usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) { + list_add(&buf->list, &acm->spare_read_bufs); + spin_lock(&acm->read_lock); + list_add(&rcv->list, &acm->spare_read_urbs); + spin_unlock(&acm->read_lock); + return; + } + } } /* data interface wrote those outgoing bytes */ @@ -369,6 +434,7 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) { struct acm *acm; int rv = -EINVAL; + int i; dbg("Entering acm_tty_open.\n"); down(&open_sem); @@ -382,7 +448,9 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) tty->driver_data = acm; acm->tty = tty; - + /* force low_latency on so that our tty_push actually forces the data through, + otherwise it is scheduled, and with high data rates data can get lost. */ + tty->low_latency = 1; if (acm->used++) { goto done; @@ -394,18 +462,20 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) goto bail_out; } - acm->readurb->dev = acm->dev; - if (usb_submit_urb(acm->readurb, GFP_KERNEL)) { - dbg("usb_submit_urb(read bulk) failed"); - goto bail_out_and_unlink; - } - if (0 > acm_set_control(acm, acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS)) goto full_bailout; - /* force low_latency on so that our tty_push actually forces the data through, - otherwise it is scheduled, and with high data rates data can get lost. */ - tty->low_latency = 1; + INIT_LIST_HEAD(&acm->spare_read_urbs); + INIT_LIST_HEAD(&acm->spare_read_bufs); + INIT_LIST_HEAD(&acm->filled_read_bufs); + for (i = 0; i < ACM_NRU; i++) { + list_add(&(acm->ru[i].list), &acm->spare_read_urbs); + } + for (i = 0; i < ACM_NRB; i++) { + list_add(&(acm->rb[i].list), &acm->spare_read_bufs); + } + + tasklet_schedule(&acm->urb_task); done: err_out: @@ -413,8 +483,6 @@ err_out: return rv; full_bailout: - usb_kill_urb(acm->readurb); -bail_out_and_unlink: usb_kill_urb(acm->ctrlurb); bail_out: acm->used--; @@ -424,18 +492,22 @@ bail_out: static void acm_tty_unregister(struct acm *acm) { + int i; + tty_unregister_device(acm_tty_driver, acm->minor); usb_put_intf(acm->control); acm_table[acm->minor] = NULL; usb_free_urb(acm->ctrlurb); - usb_free_urb(acm->readurb); usb_free_urb(acm->writeurb); + for (i = 0; i < ACM_NRU; i++) + usb_free_urb(acm->ru[i].urb); kfree(acm); } static void acm_tty_close(struct tty_struct *tty, struct file *filp) { struct acm *acm = tty->driver_data; + int i; if (!acm || !acm->used) return; @@ -446,7 +518,8 @@ static void acm_tty_close(struct tty_struct *tty, struct file *filp) acm_set_control(acm, acm->ctrlout = 0); usb_kill_urb(acm->ctrlurb); usb_kill_urb(acm->writeurb); - usb_kill_urb(acm->readurb); + for (i = 0; i < ACM_NRU; i++) + usb_kill_urb(acm->ru[i].urb); } else acm_tty_unregister(acm); } @@ -528,10 +601,7 @@ static void acm_tty_unthrottle(struct tty_struct *tty) spin_lock_bh(&acm->throttle_lock); acm->throttle = 0; spin_unlock_bh(&acm->throttle_lock); - if (acm->resubmit_to_unthrottle) { - acm->resubmit_to_unthrottle = 0; - acm_read_bulk(acm->readurb, NULL); - } + tasklet_schedule(&acm->urb_task); } static void acm_tty_break_ctl(struct tty_struct *tty, int state) @@ -694,6 +764,7 @@ static int acm_probe (struct usb_interface *intf, int call_interface_num = -1; int data_interface_num; unsigned long quirks; + int i; /* handle quirks deadly to normal probing*/ quirks = (unsigned long)id->driver_info; @@ -833,7 +904,7 @@ skip_normal_probe: } ctrlsize = le16_to_cpu(epctrl->wMaxPacketSize); - readsize = le16_to_cpu(epread->wMaxPacketSize); + readsize = le16_to_cpu(epread->wMaxPacketSize)*2; acm->writesize = le16_to_cpu(epwrite->wMaxPacketSize); acm->control = control_interface; acm->data = data_interface; @@ -842,12 +913,14 @@ skip_normal_probe: acm->ctrl_caps = ac_management_function; acm->ctrlsize = ctrlsize; acm->readsize = readsize; - acm->bh.func = acm_rx_tasklet; - acm->bh.data = (unsigned long) acm; + acm->urb_task.func = acm_rx_tasklet; + acm->urb_task.data = (unsigned long) acm; INIT_WORK(&acm->work, acm_softint, acm); spin_lock_init(&acm->throttle_lock); spin_lock_init(&acm->write_lock); + spin_lock_init(&acm->read_lock); acm->write_ready = 1; + acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress); buf = usb_buffer_alloc(usb_dev, ctrlsize, GFP_KERNEL, &acm->ctrl_dma); if (!buf) { @@ -856,13 +929,6 @@ skip_normal_probe: } acm->ctrl_buffer = buf; - buf = usb_buffer_alloc(usb_dev, readsize, GFP_KERNEL, &acm->read_dma); - if (!buf) { - dev_dbg(&intf->dev, "out of memory (read buffer alloc)\n"); - goto alloc_fail3; - } - acm->read_buffer = buf; - if (acm_write_buffers_alloc(acm) < 0) { dev_dbg(&intf->dev, "out of memory (write buffer alloc)\n"); goto alloc_fail4; @@ -873,10 +939,25 @@ skip_normal_probe: dev_dbg(&intf->dev, "out of memory (ctrlurb kmalloc)\n"); goto alloc_fail5; } - acm->readurb = usb_alloc_urb(0, GFP_KERNEL); - if (!acm->readurb) { - dev_dbg(&intf->dev, "out of memory (readurb kmalloc)\n"); - goto alloc_fail6; + for (i = 0; i < ACM_NRU; i++) { + struct acm_ru *rcv = &(acm->ru[i]); + + if (!(rcv->urb = usb_alloc_urb(0, GFP_KERNEL))) { + dev_dbg(&intf->dev, "out of memory (read urbs usb_alloc_urb)\n"); + goto alloc_fail7; + } + + rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + rcv->instance = acm; + } + for (i = 0; i < ACM_NRB; i++) { + struct acm_rb *buf = &(acm->rb[i]); + + // Using usb_buffer_alloc instead of kmalloc as Oliver suggested + if (!(buf->base = usb_buffer_alloc(acm->dev, readsize, GFP_KERNEL, &buf->dma))) { + dev_dbg(&intf->dev, "out of memory (read bufs usb_buffer_alloc)\n"); + goto alloc_fail7; + } } acm->writeurb = usb_alloc_urb(0, GFP_KERNEL); if (!acm->writeurb) { @@ -889,15 +970,9 @@ skip_normal_probe: acm->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; acm->ctrlurb->transfer_dma = acm->ctrl_dma; - usb_fill_bulk_urb(acm->readurb, usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress), - acm->read_buffer, readsize, acm_read_bulk, acm); - acm->readurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; - acm->readurb->transfer_dma = acm->read_dma; - usb_fill_bulk_urb(acm->writeurb, usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress), NULL, acm->writesize, acm_write_bulk, acm); acm->writeurb->transfer_flags |= URB_NO_FSBR | URB_NO_TRANSFER_DMA_MAP; - /* acm->writeurb->transfer_dma = 0; */ dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor); @@ -917,14 +992,14 @@ skip_normal_probe: return 0; alloc_fail7: - usb_free_urb(acm->readurb); -alloc_fail6: + for (i = 0; i < ACM_NRB; i++) + usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma); + for (i = 0; i < ACM_NRU; i++) + usb_free_urb(acm->ru[i].urb); usb_free_urb(acm->ctrlurb); alloc_fail5: acm_write_buffers_free(acm); alloc_fail4: - usb_buffer_free(usb_dev, readsize, acm->read_buffer, acm->read_dma); -alloc_fail3: usb_buffer_free(usb_dev, ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); alloc_fail2: kfree(acm); @@ -936,6 +1011,7 @@ static void acm_disconnect(struct usb_interface *intf) { struct acm *acm = usb_get_intfdata (intf); struct usb_device *usb_dev = interface_to_usbdev(intf); + int i; if (!acm || !acm->dev) { dbg("disconnect on nonexisting interface"); @@ -946,15 +1022,24 @@ static void acm_disconnect(struct usb_interface *intf) acm->dev = NULL; usb_set_intfdata (intf, NULL); + tasklet_disable(&acm->urb_task); + usb_kill_urb(acm->ctrlurb); - usb_kill_urb(acm->readurb); usb_kill_urb(acm->writeurb); + for (i = 0; i < ACM_NRU; i++) + usb_kill_urb(acm->ru[i].urb); + + INIT_LIST_HEAD(&acm->filled_read_bufs); + INIT_LIST_HEAD(&acm->spare_read_bufs); + + tasklet_enable(&acm->urb_task); flush_scheduled_work(); /* wait for acm_softint */ acm_write_buffers_free(acm); - usb_buffer_free(usb_dev, acm->readsize, acm->read_buffer, acm->read_dma); usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma); + for (i = 0; i < ACM_NRB; i++) + usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma); usb_driver_release_interface(&acm_driver, acm->data); -- cgit v1.2.3 From 75318d2d7cab77b14c5d3dbd5e69f2680a769e16 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Mon, 21 Nov 2005 14:53:03 -0800 Subject: [PATCH] USB: remove .owner field from struct usb_driver It is no longer needed, so let's remove it, saving a bit of memory. Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/usb/class/cdc-acm.c') diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 72936dc15ec..93de121f52a 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1088,7 +1088,6 @@ static struct usb_device_id acm_ids[] = { MODULE_DEVICE_TABLE (usb, acm_ids); static struct usb_driver acm_driver = { - .owner = THIS_MODULE, .name = "cdc_acm", .probe = acm_probe, .disconnect = acm_disconnect, -- cgit v1.2.3 From 4c4c9432a6c916729c7296c47fe93b053a73e20c Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Tue, 29 Nov 2005 09:43:42 +0100 Subject: [PATCH] USB: mark various usb tables const patch below marks various USB tables and variables as const so that they end up in .rodata section and don't cacheline share with things that get written to. For the non-array variables it also allows gcc to optimize more. Signed-off-by: Arjan van de Ven Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/usb/class/cdc-acm.c') diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 93de121f52a..248279e44c9 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -658,7 +658,7 @@ static int acm_tty_ioctl(struct tty_struct *tty, struct file *file, unsigned int return -ENOIOCTLCMD; } -static __u32 acm_tty_speed[] = { +static const __u32 acm_tty_speed[] = { 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 500000, 576000, @@ -666,7 +666,7 @@ static __u32 acm_tty_speed[] = { 2500000, 3000000, 3500000, 4000000 }; -static __u8 acm_tty_size[] = { +static const __u8 acm_tty_size[] = { 5, 6, 7, 8 }; -- cgit v1.2.3