![Johan Hovold](/assets/img/avatar_default.png)
Drop the host-driver buffer headroom that was used to transfer the cport id on ES1 and ES2. Rather than transferring additional bytes on the wire and having to deal with buffer-alignment issues (e.g. requiring the headroom to be a multiple of 8 bytes) simply drop the headroom functionality. Host drivers are expected set up their transfer descriptors separately from the data buffers and any intermediate drivers (e.g. for Greybus over USB) can (ab)use the operation message pad bytes for now. Signed-off-by: Johan Hovold <johan@hovoldconsulting.com> Reviewed-by: Alex Elder <elder@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
699 lines
18 KiB
C
699 lines
18 KiB
C
/*
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* Greybus "AP" USB driver for "ES2" controller chips
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*
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* Copyright 2014-2015 Google Inc.
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* Copyright 2014-2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/sizes.h>
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#include <linux/usb.h>
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#include <linux/kfifo.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <asm/unaligned.h>
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#include "greybus.h"
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#include "svc_msg.h"
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#include "kernel_ver.h"
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/* Memory sizes for the buffers sent to/from the ES1 controller */
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#define ES1_SVC_MSG_SIZE (sizeof(struct svc_msg) + SZ_64K)
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#define ES1_GBUF_MSG_SIZE_MAX PAGE_SIZE
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static const struct usb_device_id id_table[] = {
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/* Made up numbers for the SVC USB Bridge in ES2 */
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{ USB_DEVICE(0xffff, 0x0002) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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#define APB1_LOG_SIZE SZ_16K
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static struct dentry *apb1_log_dentry;
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static struct dentry *apb1_log_enable_dentry;
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static struct task_struct *apb1_log_task;
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static DEFINE_KFIFO(apb1_log_fifo, char, APB1_LOG_SIZE);
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/*
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* Number of CPort IN urbs in flight at any point in time.
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* Adjust if we are having stalls in the USB buffer due to not enough urbs in
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* flight.
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*/
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#define NUM_CPORT_IN_URB 4
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/* Number of CPort OUT urbs in flight at any point in time.
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* Adjust if we get messages saying we are out of urbs in the system log.
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*/
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#define NUM_CPORT_OUT_URB 8
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/**
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* es1_ap_dev - ES1 USB Bridge to AP structure
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* @usb_dev: pointer to the USB device we are.
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* @usb_intf: pointer to the USB interface we are bound to.
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* @hd: pointer to our greybus_host_device structure
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* @control_endpoint: endpoint to send data to SVC
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* @svc_endpoint: endpoint for SVC data in
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* @cport_in_endpoint: bulk in endpoint for CPort data
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* @cport-out_endpoint: bulk out endpoint for CPort data
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* @svc_buffer: buffer for SVC messages coming in on @svc_endpoint
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* @svc_urb: urb for SVC messages coming in on @svc_endpoint
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* @cport_in_urb: array of urbs for the CPort in messages
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* @cport_in_buffer: array of buffers for the @cport_in_urb urbs
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* @cport_out_urb: array of urbs for the CPort out messages
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* @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
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* not.
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* @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
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*/
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struct es1_ap_dev {
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struct usb_device *usb_dev;
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struct usb_interface *usb_intf;
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struct greybus_host_device *hd;
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__u8 control_endpoint;
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__u8 svc_endpoint;
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__u8 cport_in_endpoint;
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__u8 cport_out_endpoint;
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u8 *svc_buffer;
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struct urb *svc_urb;
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struct urb *cport_in_urb[NUM_CPORT_IN_URB];
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u8 *cport_in_buffer[NUM_CPORT_IN_URB];
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struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
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bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
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spinlock_t cport_out_urb_lock;
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};
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static inline struct es1_ap_dev *hd_to_es1(struct greybus_host_device *hd)
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{
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return (struct es1_ap_dev *)&hd->hd_priv;
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}
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static void cport_out_callback(struct urb *urb);
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static void usb_log_enable(struct es1_ap_dev *es1);
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static void usb_log_disable(struct es1_ap_dev *es1);
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/*
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* Buffer constraints for the host driver.
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*
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* A "buffer" is used to hold data to be transferred for Greybus by
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* the host driver. A buffer is represented by a "buffer pointer",
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* which defines a region of memory used by the host driver for
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* transferring the data. When Greybus allocates a buffer, it must
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* do so subject to the constraints associated with the host driver.
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*
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* size_max: The maximum size of a buffer
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*/
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static void hd_buffer_constraints(struct greybus_host_device *hd)
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{
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hd->buffer_size_max = ES1_GBUF_MSG_SIZE_MAX;
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}
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#define ES1_TIMEOUT 500 /* 500 ms for the SVC to do something */
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static int submit_svc(struct svc_msg *svc_msg, struct greybus_host_device *hd)
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{
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struct es1_ap_dev *es1 = hd_to_es1(hd);
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int retval;
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/* SVC messages go down our control pipe */
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retval = usb_control_msg(es1->usb_dev,
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usb_sndctrlpipe(es1->usb_dev,
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es1->control_endpoint),
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0x01, /* vendor request AP message */
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
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0x00, 0x00,
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(char *)svc_msg,
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sizeof(*svc_msg),
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ES1_TIMEOUT);
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if (retval != sizeof(*svc_msg))
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return retval;
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return 0;
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}
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static struct urb *next_free_urb(struct es1_ap_dev *es1, gfp_t gfp_mask)
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{
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struct urb *urb = NULL;
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unsigned long flags;
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int i;
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spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
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/* Look in our pool of allocated urbs first, as that's the "fastest" */
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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if (es1->cport_out_urb_busy[i] == false) {
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es1->cport_out_urb_busy[i] = true;
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urb = es1->cport_out_urb[i];
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break;
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}
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}
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spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
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if (urb)
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return urb;
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/*
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* Crap, pool is empty, complain to the syslog and go allocate one
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* dynamically as we have to succeed.
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*/
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dev_err(&es1->usb_dev->dev,
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"No free CPort OUT urbs, having to dynamically allocate one!\n");
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return usb_alloc_urb(0, gfp_mask);
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}
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static void free_urb(struct es1_ap_dev *es1, struct urb *urb)
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{
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unsigned long flags;
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int i;
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/*
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* See if this was an urb in our pool, if so mark it "free", otherwise
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* we need to free it ourselves.
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*/
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spin_lock_irqsave(&es1->cport_out_urb_lock, flags);
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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if (urb == es1->cport_out_urb[i]) {
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es1->cport_out_urb_busy[i] = false;
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urb = NULL;
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break;
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}
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}
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spin_unlock_irqrestore(&es1->cport_out_urb_lock, flags);
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/* If urb is not NULL, then we need to free this urb */
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usb_free_urb(urb);
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}
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/*
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* Returns an opaque cookie value if successful, or a pointer coded
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* error otherwise. If the caller wishes to cancel the in-flight
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* buffer, it must supply the returned cookie to the cancel routine.
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*/
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static void *message_send(struct greybus_host_device *hd, u16 cport_id,
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struct gb_message *message, gfp_t gfp_mask)
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{
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struct es1_ap_dev *es1 = hd_to_es1(hd);
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struct usb_device *udev = es1->usb_dev;
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void *buffer;
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size_t buffer_size;
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int retval;
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struct urb *urb;
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buffer = message->buffer;
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buffer_size = sizeof(*message->header) + message->payload_size;
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/*
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* The data actually transferred will include an indication
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* of where the data should be sent. Do one last check of
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* the target CPort id before filling it in.
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*/
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if (cport_id == CPORT_ID_BAD) {
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pr_err("request to send inbound data buffer\n");
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return ERR_PTR(-EINVAL);
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}
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/* Find a free urb */
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urb = next_free_urb(es1, gfp_mask);
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if (!urb)
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return ERR_PTR(-ENOMEM);
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/*
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* We (ab)use the operation-message header pad bytes to transfer the
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* cport id in order to minimise overhead.
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*/
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put_unaligned_le16(cport_id, message->header->pad);
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usb_fill_bulk_urb(urb, udev,
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usb_sndbulkpipe(udev, es1->cport_out_endpoint),
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buffer, buffer_size,
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cport_out_callback, message);
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retval = usb_submit_urb(urb, gfp_mask);
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if (retval) {
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pr_err("error %d submitting URB\n", retval);
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free_urb(es1, urb);
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put_unaligned_le16(0, message->header->pad);
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return ERR_PTR(retval);
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}
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return urb;
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}
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/*
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* The cookie value supplied is the value that message_send()
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* returned to its caller. It identifies the message that should be
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* canceled. This function must also handle (which is to say,
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* ignore) a null cookie value.
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*/
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static void message_cancel(void *cookie)
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{
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/*
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* We really should be defensive and track all outstanding
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* (sent) messages rather than trusting the cookie provided
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* is valid. For the time being, this will do.
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*/
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if (cookie)
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usb_kill_urb(cookie);
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}
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static struct greybus_host_driver es1_driver = {
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.hd_priv_size = sizeof(struct es1_ap_dev),
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.message_send = message_send,
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.message_cancel = message_cancel,
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.submit_svc = submit_svc,
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};
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/* Common function to report consistent warnings based on URB status */
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static int check_urb_status(struct urb *urb)
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{
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struct device *dev = &urb->dev->dev;
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int status = urb->status;
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switch (status) {
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case 0:
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return 0;
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case -EOVERFLOW:
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dev_err(dev, "%s: overflow actual length is %d\n",
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__func__, urb->actual_length);
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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case -EILSEQ:
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case -EPROTO:
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/* device is gone, stop sending */
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return status;
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}
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dev_err(dev, "%s: unknown status %d\n", __func__, status);
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return -EAGAIN;
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}
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static void ap_disconnect(struct usb_interface *interface)
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{
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struct es1_ap_dev *es1;
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struct usb_device *udev;
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int i;
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es1 = usb_get_intfdata(interface);
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if (!es1)
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return;
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usb_log_disable(es1);
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/* Tear down everything! */
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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struct urb *urb = es1->cport_out_urb[i];
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if (!urb)
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break;
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usb_kill_urb(urb);
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usb_free_urb(urb);
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es1->cport_out_urb[i] = NULL;
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es1->cport_out_urb_busy[i] = false; /* just to be anal */
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}
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for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
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struct urb *urb = es1->cport_in_urb[i];
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if (!urb)
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break;
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usb_kill_urb(urb);
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usb_free_urb(urb);
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kfree(es1->cport_in_buffer[i]);
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es1->cport_in_buffer[i] = NULL;
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}
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usb_kill_urb(es1->svc_urb);
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usb_free_urb(es1->svc_urb);
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es1->svc_urb = NULL;
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kfree(es1->svc_buffer);
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es1->svc_buffer = NULL;
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usb_set_intfdata(interface, NULL);
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udev = es1->usb_dev;
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greybus_remove_hd(es1->hd);
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usb_put_dev(udev);
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}
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/* Callback for when we get a SVC message */
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static void svc_in_callback(struct urb *urb)
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{
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struct greybus_host_device *hd = urb->context;
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struct device *dev = &urb->dev->dev;
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int status = check_urb_status(urb);
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int retval;
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if (status) {
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if ((status == -EAGAIN) || (status == -EPROTO))
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goto exit;
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dev_err(dev, "urb svc in error %d (dropped)\n", status);
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return;
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}
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/* We have a message, create a new message structure, add it to the
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* list, and wake up our thread that will process the messages.
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*/
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greybus_svc_in(hd, urb->transfer_buffer, urb->actual_length);
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exit:
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/* resubmit the urb to get more messages */
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(dev, "Can not submit urb for AP data: %d\n", retval);
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}
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static void cport_in_callback(struct urb *urb)
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{
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struct greybus_host_device *hd = urb->context;
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struct device *dev = &urb->dev->dev;
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struct gb_operation_msg_hdr *header;
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int status = check_urb_status(urb);
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int retval;
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u16 cport_id;
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if (status) {
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if ((status == -EAGAIN) || (status == -EPROTO))
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goto exit;
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dev_err(dev, "urb cport in error %d (dropped)\n", status);
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return;
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}
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if (urb->actual_length < sizeof(*header)) {
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dev_err(dev, "%s: short message received\n", __func__);
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goto exit;
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}
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header = urb->transfer_buffer;
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cport_id = get_unaligned_le16(header->pad);
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put_unaligned_le16(0, header->pad);
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greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
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urb->actual_length);
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exit:
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/* put our urb back in the request pool */
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(dev, "%s: error %d in submitting urb.\n",
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__func__, retval);
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}
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static void cport_out_callback(struct urb *urb)
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{
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struct gb_message *message = urb->context;
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struct greybus_host_device *hd = message->operation->connection->hd;
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struct es1_ap_dev *es1 = hd_to_es1(hd);
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int status = check_urb_status(urb);
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/* Clear the pad bytes used for the cport id */
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put_unaligned_le16(0, message->header->pad);
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/*
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* Tell the submitter that the message send (attempt) is
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* complete, and report the status.
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*/
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greybus_message_sent(hd, message, status);
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free_urb(es1, urb);
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}
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#define APB1_LOG_MSG_SIZE 64
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static void apb1_log_get(struct es1_ap_dev *es1, char *buf)
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{
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int retval;
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/* SVC messages go down our control pipe */
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do {
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retval = usb_control_msg(es1->usb_dev,
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usb_rcvctrlpipe(es1->usb_dev,
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es1->control_endpoint),
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0x02, /* vendor request APB1 log */
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
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0x00, 0x00,
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buf,
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APB1_LOG_MSG_SIZE,
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ES1_TIMEOUT);
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if (retval > 0)
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kfifo_in(&apb1_log_fifo, buf, retval);
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} while (retval > 0);
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}
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static int apb1_log_poll(void *data)
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{
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struct es1_ap_dev *es1 = data;
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char *buf;
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buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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while (!kthread_should_stop()) {
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msleep(1000);
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apb1_log_get(es1, buf);
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}
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kfree(buf);
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return 0;
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}
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static ssize_t apb1_log_read(struct file *f, char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t ret;
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size_t copied;
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char *tmp_buf;
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if (count > APB1_LOG_SIZE)
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count = APB1_LOG_SIZE;
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tmp_buf = kmalloc(count, GFP_KERNEL);
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if (!tmp_buf)
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return -ENOMEM;
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copied = kfifo_out(&apb1_log_fifo, tmp_buf, count);
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ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied);
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kfree(tmp_buf);
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return ret;
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}
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static const struct file_operations apb1_log_fops = {
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.read = apb1_log_read,
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};
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static void usb_log_enable(struct es1_ap_dev *es1)
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{
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if (!IS_ERR_OR_NULL(apb1_log_task))
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return;
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|
|
/* get log from APB1 */
|
|
apb1_log_task = kthread_run(apb1_log_poll, es1, "apb1_log");
|
|
if (IS_ERR(apb1_log_task))
|
|
return;
|
|
apb1_log_dentry = debugfs_create_file("apb1_log", S_IRUGO,
|
|
gb_debugfs_get(), NULL,
|
|
&apb1_log_fops);
|
|
}
|
|
|
|
static void usb_log_disable(struct es1_ap_dev *es1)
|
|
{
|
|
if (IS_ERR_OR_NULL(apb1_log_task))
|
|
return;
|
|
|
|
debugfs_remove(apb1_log_dentry);
|
|
apb1_log_dentry = NULL;
|
|
|
|
kthread_stop(apb1_log_task);
|
|
apb1_log_task = NULL;
|
|
}
|
|
|
|
static ssize_t apb1_log_enable_read(struct file *f, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
char tmp_buf[3];
|
|
int enable = !IS_ERR_OR_NULL(apb1_log_task);
|
|
|
|
sprintf(tmp_buf, "%d\n", enable);
|
|
return simple_read_from_buffer(buf, count, ppos, tmp_buf, 3);
|
|
}
|
|
|
|
static ssize_t apb1_log_enable_write(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
int enable;
|
|
ssize_t retval;
|
|
struct es1_ap_dev *es1 = (struct es1_ap_dev *)f->f_inode->i_private;
|
|
|
|
retval = kstrtoint_from_user(buf, count, 10, &enable);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (enable)
|
|
usb_log_enable(es1);
|
|
else
|
|
usb_log_disable(es1);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations apb1_log_enable_fops = {
|
|
.read = apb1_log_enable_read,
|
|
.write = apb1_log_enable_write,
|
|
};
|
|
|
|
/*
|
|
* The ES1 USB Bridge device contains 4 endpoints
|
|
* 1 Control - usual USB stuff + AP -> SVC messages
|
|
* 1 Interrupt IN - SVC -> AP messages
|
|
* 1 Bulk IN - CPort data in
|
|
* 1 Bulk OUT - CPort data out
|
|
*/
|
|
static int ap_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct es1_ap_dev *es1;
|
|
struct greybus_host_device *hd;
|
|
struct usb_device *udev;
|
|
struct usb_host_interface *iface_desc;
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
bool int_in_found = false;
|
|
bool bulk_in_found = false;
|
|
bool bulk_out_found = false;
|
|
int retval = -ENOMEM;
|
|
int i;
|
|
u8 svc_interval = 0;
|
|
|
|
udev = usb_get_dev(interface_to_usbdev(interface));
|
|
|
|
hd = greybus_create_hd(&es1_driver, &udev->dev);
|
|
if (!hd) {
|
|
usb_put_dev(udev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Fill in the buffer allocation constraints */
|
|
hd_buffer_constraints(hd);
|
|
|
|
es1 = hd_to_es1(hd);
|
|
es1->hd = hd;
|
|
es1->usb_intf = interface;
|
|
es1->usb_dev = udev;
|
|
spin_lock_init(&es1->cport_out_urb_lock);
|
|
usb_set_intfdata(interface, es1);
|
|
|
|
/* Control endpoint is the pipe to talk to this AP, so save it off */
|
|
endpoint = &udev->ep0.desc;
|
|
es1->control_endpoint = endpoint->bEndpointAddress;
|
|
|
|
/* find all 3 of our endpoints */
|
|
iface_desc = interface->cur_altsetting;
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
|
endpoint = &iface_desc->endpoint[i].desc;
|
|
|
|
if (usb_endpoint_is_int_in(endpoint)) {
|
|
es1->svc_endpoint = endpoint->bEndpointAddress;
|
|
svc_interval = endpoint->bInterval;
|
|
int_in_found = true;
|
|
} else if (usb_endpoint_is_bulk_in(endpoint)) {
|
|
es1->cport_in_endpoint = endpoint->bEndpointAddress;
|
|
bulk_in_found = true;
|
|
} else if (usb_endpoint_is_bulk_out(endpoint)) {
|
|
es1->cport_out_endpoint = endpoint->bEndpointAddress;
|
|
bulk_out_found = true;
|
|
} else {
|
|
dev_err(&udev->dev,
|
|
"Unknown endpoint type found, address %x\n",
|
|
endpoint->bEndpointAddress);
|
|
}
|
|
}
|
|
if ((int_in_found == false) ||
|
|
(bulk_in_found == false) ||
|
|
(bulk_out_found == false)) {
|
|
dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
|
|
goto error;
|
|
}
|
|
|
|
/* Create our buffer and URB to get SVC messages, and start it up */
|
|
es1->svc_buffer = kmalloc(ES1_SVC_MSG_SIZE, GFP_KERNEL);
|
|
if (!es1->svc_buffer)
|
|
goto error;
|
|
|
|
es1->svc_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!es1->svc_urb)
|
|
goto error;
|
|
|
|
usb_fill_int_urb(es1->svc_urb, udev,
|
|
usb_rcvintpipe(udev, es1->svc_endpoint),
|
|
es1->svc_buffer, ES1_SVC_MSG_SIZE, svc_in_callback,
|
|
hd, svc_interval);
|
|
|
|
/* Allocate buffers for our cport in messages and start them up */
|
|
for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
|
|
struct urb *urb;
|
|
u8 *buffer;
|
|
|
|
urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!urb)
|
|
goto error;
|
|
buffer = kmalloc(ES1_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
|
|
if (!buffer)
|
|
goto error;
|
|
|
|
usb_fill_bulk_urb(urb, udev,
|
|
usb_rcvbulkpipe(udev, es1->cport_in_endpoint),
|
|
buffer, ES1_GBUF_MSG_SIZE_MAX,
|
|
cport_in_callback, hd);
|
|
es1->cport_in_urb[i] = urb;
|
|
es1->cport_in_buffer[i] = buffer;
|
|
retval = usb_submit_urb(urb, GFP_KERNEL);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
|
|
/* Allocate urbs for our CPort OUT messages */
|
|
for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
|
|
struct urb *urb;
|
|
|
|
urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!urb)
|
|
goto error;
|
|
|
|
es1->cport_out_urb[i] = urb;
|
|
es1->cport_out_urb_busy[i] = false; /* just to be anal */
|
|
}
|
|
|
|
/* Start up our svc urb, which allows events to start flowing */
|
|
retval = usb_submit_urb(es1->svc_urb, GFP_KERNEL);
|
|
if (retval)
|
|
goto error;
|
|
|
|
apb1_log_enable_dentry = debugfs_create_file("apb1_log_enable",
|
|
(S_IWUSR | S_IRUGO),
|
|
gb_debugfs_get(), es1,
|
|
&apb1_log_enable_fops);
|
|
|
|
return 0;
|
|
error:
|
|
ap_disconnect(interface);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static struct usb_driver es1_ap_driver = {
|
|
.name = "es1_ap_driver",
|
|
.probe = ap_probe,
|
|
.disconnect = ap_disconnect,
|
|
.id_table = id_table,
|
|
};
|
|
|
|
module_usb_driver(es1_ap_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
|