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[Qemu-devel] [PATCH] usb: Support for removing device by host addr, impr

Subject: [Qemu-devel] [PATCH] usb: Support for removing device by host addr, improved auto filter syntax
From: Max Krasnyansky
Date: Sat, 6 Sep 2008 05:40:44 +0000
This patch adds support for removing USB devices by host address.
Which is usefull for things like libvirtd because there is no easy way to
find guest USB address of the host device.
In other words you can now do:
   usb_add host:3.5
   ...
   usb_del host:3.5
Before the patch 'usb_del' did not support 'host:' notation.

----
Syntax for specifying auto connect filters has been improved.
Old syntax was
    host:bus.dev
    host:pid:vid
New syntax is
    host:auto:bus.dev[:pid:vid]
In both the cases any attribute can be set to "*".

New syntax is more flexible and lets you do things like
    host:3.*:5533:* /* grab any device on bus 3 with vendor id 5533 */

It's now possible to remove auto filters. For example:
    usb_del host:auto:3.*:5533:*

Active filters are printed after all host devices in 'info usb' output.
Which now looks like this:

  Device 1.1, speed 480 Mb/s
    Hub: USB device 1d6b:0002, EHCI Host Controller
  Device 1.4, speed 480 Mb/s
    Class 00: USB device 1058:0704, External HDD
  Auto filters:
    Device 3.* ID *:*

Signed-off-by: Max Krasnyansky <maxk@xxxxxxxxxx>
---
 hw/usb.h    |    1 +
 usb-linux.c |  203 ++++++++++++++++++++++++++++++++++++++++++++++++++---------
 vl.c        |    3 +
 3 files changed, 176 insertions(+), 31 deletions(-)

diff --git a/hw/usb.h b/hw/usb.h
index 997e69f..1a353bb 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -240,6 +240,7 @@ USBDevice *usb_hub_init(int nb_ports);
 
 /* usb-linux.c */
 USBDevice *usb_host_device_open(const char *devname);
+int usb_host_device_close(const char *devname);
 void usb_host_info(void);
 
 /* usb-hid.c */
diff --git a/usb-linux.c b/usb-linux.c
index 3ac4440..b9a219e 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -5,7 +5,7 @@
  *
  * Copyright (c) 2008 Max Krasnyansky
  *      Support for host device auto connect & disconnect
- *      Magor rewrite to support fully async operation
+ *      Major rewrite to support fully async operation
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to 
deal
@@ -952,23 +952,52 @@ fail:
     return NULL;
 }
 
+static int usb_host_auto_add(const char *spec);
+static int usb_host_auto_del(const char *spec);
+
 USBDevice *usb_host_device_open(const char *devname)
 {
     int bus_num, addr;
     char product_name[PRODUCT_NAME_SZ];
 
-    if (usb_host_find_device(&bus_num, &addr,
-                             product_name, sizeof(product_name),
-                             devname) < 0)
+    if (strstr(devname, "auto:")) {
+        usb_host_auto_add(devname);
         return NULL;
+    }
 
-     if (hostdev_find(bus_num, addr)) {
-        term_printf("husb: host usb device %d.%d is already open\n", bus_num, 
addr);
+    if (usb_host_find_device(&bus_num, &addr, product_name, 
sizeof(product_name),
+                             devname) < 0)
         return NULL;
-     }
+
+    if (hostdev_find(bus_num, addr)) {
+       term_printf("husb: host usb device %d.%d is already open\n", bus_num, 
addr);
+       return NULL;
+    }
 
     return usb_host_device_open_addr(bus_num, addr, product_name);
 }
+
+int usb_host_device_close(const char *devname)
+{
+    char product_name[PRODUCT_NAME_SZ];
+    int bus_num, addr;
+    USBHostDevice *s;
+
+    if (strstr(devname, "auto:"))
+        return usb_host_auto_del(devname);
+
+    if (usb_host_find_device(&bus_num, &addr, product_name, 
sizeof(product_name),
+                             devname) < 0)
+        return -1;
+ 
+    s = hostdev_find(bus_num, addr);
+    if (s) {
+        usb_device_del_addr(0, s->dev.addr);
+        return 0;
+    }
+
+    return -1;
+}
  
 static int get_tag_value(char *buf, int buf_size,
                          const char *str, const char *tag,
@@ -1127,21 +1156,76 @@ static void usb_host_auto_timer(void *unused)
 }
 
 /*
- * Add autoconnect filter
- * -1 means 'any' (device, vendor, etc)
+ * Autoconnect filter
+ * Format:
+ *    auto:bus:dev[:vid:pid]
+ *    auto:bus.dev[:vid:pid]
+ *
+ *    bus  - bus number    (dec, * means any)
+ *    dev  - device number (dec, * means any)
+ *    vid  - vendor id     (hex, * means any)
+ *    pid  - product id    (hex, * means any)
+ *
+ *    See 'lsusb' output.
  */
-static void usb_host_auto_add(int bus_num, int addr, int vendor_id, int 
product_id)
+static int parse_filter(const char *spec, struct USBAutoFilter *f)
 {
-    struct USBAutoFilter *f = qemu_mallocz(sizeof(*f));
+    enum { BUS, DEV, VID, PID, DONE };
+    const char *p = spec;
+    int i;
+
+    f->bus_num    = -1;
+    f->addr       = -1;
+    f->vendor_id  = -1;
+    f->product_id = -1;
+
+    for (i = BUS; i < DONE; i++) {
+       p = strpbrk(p, ":.");
+       if (!p) break;
+        p++;
+ 
+       if (*p == '*')
+            continue;
+
+        switch(i) {
+        case BUS: f->bus_num = strtol(p, NULL, 10);    break;
+        case DEV: f->addr    = strtol(p, NULL, 10);    break;
+        case VID: f->vendor_id  = strtol(p, NULL, 16); break;
+        case PID: f->product_id = strtol(p, NULL, 16); break;
+        }
+    }
+
+    if (i < DEV) {
+        fprintf(stderr, "husb: invalid auto filter spec %s\n", spec);
+        return -1;
+    }
+
+    return 0;
+}
+
+static int match_filter(const struct USBAutoFilter *f1, 
+                        const struct USBAutoFilter *f2)
+{
+    return f1->bus_num    == f2->bus_num &&
+           f1->addr       == f2->addr &&
+           f1->vendor_id  == f2->vendor_id &&
+           f1->product_id == f2->product_id;
+}
+
+static int usb_host_auto_add(const char *spec)
+{
+    struct USBAutoFilter filter, *f;
+
+    if (parse_filter(spec, &filter) < 0)
+        return -1;
+
+    f = qemu_mallocz(sizeof(*f));
     if (!f) {
         fprintf(stderr, "husb: failed to allocate auto filter\n");
-        return;
+        return -1;
     }
 
-    f->bus_num = bus_num;
-    f->addr    = addr;
-    f->vendor_id  = vendor_id;
-    f->product_id = product_id;
+    *f = filter; 
 
     if (!usb_auto_filter) {
         /*
@@ -1154,18 +1238,52 @@ static void usb_host_auto_add(int bus_num, int addr, 
int vendor_id, int product_
        if (!usb_auto_timer) {
             fprintf(stderr, "husb: failed to allocate auto scan timer\n");
             qemu_free(f);
-            return;
+            return -1;
         }
 
         /* Check for new devices every two seconds */
         qemu_mod_timer(usb_auto_timer, qemu_get_clock(rt_clock) + 2000);
     }
 
-    dprintf("husb: auto filter: bus_num %d addr %d vid %d pid %d\n",
-       bus_num, addr, vendor_id, product_id);
+    dprintf("husb: added auto filter: bus_num %d addr %d vid %d pid %d\n",
+       f->bus_num, f->addr, f->vendor_id, f->product_id);
 
     f->next = usb_auto_filter;
     usb_auto_filter = f;
+
+    return 0;
+}
+
+static int usb_host_auto_del(const char *spec)
+{
+    struct USBAutoFilter *pf = usb_auto_filter;
+    struct USBAutoFilter **prev = &usb_auto_filter;
+    struct USBAutoFilter filter;
+
+    if (parse_filter(spec, &filter) < 0)
+        return -1;
+
+    while (pf) {
+        if (match_filter(pf, &filter)) {
+            dprintf("husb: removed auto filter: bus_num %d addr %d vid %d pid 
%d\n",
+                    pf->bus_num, pf->addr, pf->vendor_id, pf->product_id);
+
+            *prev = pf->next;
+
+           if (!usb_auto_filter) {
+                /* No more filters. Stop scanning. */
+                qemu_del_timer(usb_auto_timer);
+                qemu_free_timer(usb_auto_timer);
+            }
+
+            return 0;
+        }
+
+        prev = &pf->next;
+        pf   = pf->next;
+    }
+
+    return -1;
 }
 
 typedef struct FindDeviceState {
@@ -1209,12 +1327,6 @@ static int usb_host_find_device(int *pbus_num, int 
*paddr,
     p = strchr(devname, '.');
     if (p) {
         *pbus_num = strtoul(devname, NULL, 0);
-
-        if (*(p + 1) == '*') {
-            usb_host_auto_add(*pbus_num, -1, -1, -1);
-           return -1;
-       }
-
         *paddr = strtoul(p + 1, NULL, 0);
         fs.bus_num = *pbus_num;
         fs.addr = *paddr;
@@ -1223,15 +1335,10 @@ static int usb_host_find_device(int *pbus_num, int 
*paddr,
             pstrcpy(product_name, product_name_size, fs.product_name);
         return 0;
     }
+
     p = strchr(devname, ':');
     if (p) {
         fs.vendor_id = strtoul(devname, NULL, 16);
-
-        if (*(p + 1) == '*') {
-            usb_host_auto_add(-1, -1, fs.vendor_id, -1);
-           return -1;
-       }
-
         fs.product_id = strtoul(p + 1, NULL, 16);
         ret = usb_host_scan(&fs, usb_host_find_device_scan);
         if (ret) {
@@ -1325,9 +1432,38 @@ static int usb_host_info_device(void *opaque, int 
bus_num, int addr,
     return 0;
 }
 
+static void dec2str(int val, char *str)
+{
+    if (val == -1)
+        strcpy(str, "*");
+    else
+        sprintf(str, "%d", val); 
+}
+
+static void hex2str(int val, char *str)
+{
+    if (val == -1)
+        strcpy(str, "*");
+    else
+        sprintf(str, "%x", val);
+}
+
 void usb_host_info(void)
 {
+    struct USBAutoFilter *f;
+
     usb_host_scan(NULL, usb_host_info_device);
+
+    if (usb_auto_filter)
+        term_printf("  Auto filters:\n");
+    for (f = usb_auto_filter; f; f = f->next) {
+        char bus[10], addr[10], vid[10], pid[10];
+        dec2str(f->bus_num, bus);
+        dec2str(f->addr, addr);
+        hex2str(f->vendor_id, vid);
+        hex2str(f->product_id, pid);
+       term_printf("    Device %s.%s ID %s:%s\n", bus, addr, vid, pid);
+    }
 }
 
 #else
@@ -1343,4 +1479,9 @@ USBDevice *usb_host_device_open(const char *devname)
     return NULL;
 }
 
+void usb_host_device_close(const char *devname)
+{
+
+}
+
 #endif
diff --git a/vl.c b/vl.c
index 0a457a9..2d106c0 100644
--- a/vl.c
+++ b/vl.c
@@ -5866,6 +5866,9 @@ static int usb_device_del(const char *devname)
     int bus_num, addr;
     const char *p;
 
+    if (strstart(devname, "host:", &p))
+        return usb_host_device_close(p);
+
     if (!used_usb_ports)
         return -1;
 
-- 
1.5.5.1



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