sys/bus/usb/usb_mem.c

   1 /*
   2  * $NetBSD: usb_mem.c,v 1.26 2003/02/01 06:23:40 thorpej Exp $
   3  * $FreeBSD: src/sys/dev/usb/usb_mem.c,v 1.5 2003/10/04 22:13:21 joe Exp $
   4  * $DragonFly: src/sys/bus/usb/usb_mem.c,v 1.11 2007/06/28 06:32:31 hasso Exp $
   5  */
   6 /*
   7  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Lennart Augustsson (lennart@augustsson.net) at
  12  * Carlstedt Research & Technology.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *        This product includes software developed by the NetBSD
  25  *        Foundation, Inc. and its contributors.
  26  * 4. Neither the name of The NetBSD Foundation nor the names of its
  27  *    contributors may be used to endorse or promote products derived
  28  *    from this software without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  31  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  32  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  33  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  34  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  35  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  36  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  37  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  38  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  40  * POSSIBILITY OF SUCH DAMAGE.
  41  */
  42
  43 /*
  44  * USB DMA memory allocation.
  45  * We need to allocate a lot of small (many 8 byte, some larger)
  46  * memory blocks that can be used for DMA.  Using the bus_dma
  47  * routines directly would incur large overheads in space and time.
  48  */
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/malloc.h>
  52 #include <sys/kernel.h>
  53 #include <sys/endian.h>
  54 #include <sys/module.h>
  55 #include <sys/bus.h>
  56 #include <sys/queue.h>
  57 #include <sys/sysctl.h>
  58 #include <sys/ktr.h>
  59
  60 #include <machine/endian.h>
  61
  62 #ifdef DIAGNOSTIC
  63 #include <sys/proc.h>
  64 #endif
  65 #include <sys/thread2.h>
  66
  67 #include <bus/usb/usb.h>
  68 #include <bus/usb/usbdi.h>
  69 #include <bus/usb/usbdivar.h>   /* just for usb_dma_t */
  70 #include <bus/usb/usb_mem.h>
  71
  72 #define USBKTR_STRING   "ptr=%p bus=%p size=%d align=%d"
  73 #define USBKTR_ARG_SIZE (sizeof(void *) * 2 + sizeof(int) * 2)
  74
  75 #if !defined(KTR_USB_MEMORY)
  76 #define KTR_USB_MEMORY  KTR_ALL
  77 #endif
  78 KTR_INFO_MASTER(usbmem);
  79 KTR_INFO(KTR_USB_MEMORY, usbmem, alloc_full, 0, USBKTR_STRING, USBKTR_ARG_SIZE);
  80 KTR_INFO(KTR_USB_MEMORY, usbmem, alloc_frag, 0, USBKTR_STRING, USBKTR_ARG_SIZE);
  81 KTR_INFO(KTR_USB_MEMORY, usbmem, free_full, 0, USBKTR_STRING, USBKTR_ARG_SIZE);
  82 KTR_INFO(KTR_USB_MEMORY, usbmem, free_frag, 0, USBKTR_STRING, USBKTR_ARG_SIZE);
  83 KTR_INFO(KTR_USB_MEMORY, usbmem, blkalloc, 0, USBKTR_STRING, USBKTR_ARG_SIZE);
  84 KTR_INFO(KTR_USB_MEMORY, usbmem, blkalloc2, 0, USBKTR_STRING, USBKTR_ARG_SIZE);
  85 KTR_INFO(KTR_USB_MEMORY, usbmem, blkfree, 0, USBKTR_STRING, USBKTR_ARG_SIZE);
  86
  87 #define logmemory(name, ptr, bus, size, align)          \
  88         KTR_LOG(usbmem_ ## name, ptr, bus, (int)size, (int)align);
  89
  90 #ifdef USB_DEBUG
  91 #define DPRINTF(x)      if (usbdebug) logprintf x
  92 #define DPRINTFN(n,x)   if (usbdebug>(n)) logprintf x
  93 extern int usbdebug;
  94 #else
  95 #define DPRINTF(x)
  96 #define DPRINTFN(n,x)
  97 #endif
  98
  99 #define USB_MEM_SMALL 64
 100 #define USB_MEM_CHUNKS (PAGE_SIZE / USB_MEM_SMALL)
 101 #define USB_MEM_BLOCK (USB_MEM_SMALL * USB_MEM_CHUNKS)
 102
 103 /* This struct is overlayed on free fragments. */
 104 struct usb_frag_dma {
 105         usb_dma_block_t *block;
 106         u_int offs;
 107         LIST_ENTRY(usb_frag_dma) next;
 108 };
 109
 110 static bus_dmamap_callback_t usbmem_callback;
 111 static usbd_status      usb_block_allocmem(bus_dma_tag_t, size_t, size_t,
 112                                            usb_dma_block_t **);
 113 static void             usb_block_freemem(usb_dma_block_t *);
 114
 115 static LIST_HEAD(, usb_dma_block) usb_blk_freelist =
 116         LIST_HEAD_INITIALIZER(usb_blk_freelist);
 117 static int usb_blk_nfree = 0;
 118 /* XXX should have different free list for different tags (for speed) */
 119 static LIST_HEAD(, usb_frag_dma) usb_frag_freelist =
 120         LIST_HEAD_INITIALIZER(usb_frag_freelist);
 121
 122 static void
 123 usbmem_callback(void *arg, bus_dma_segment_t *segs, int nseg, int error)
 124 {
 125         int i;
 126         usb_dma_block_t *p = arg;
 127
 128         if (error == EFBIG) {
 129                 kprintf("usb: mapping to large\n");
 130                 return;
 131         }
 132
 133         p->nsegs = nseg;
 134         for (i = 0; i < nseg && i < sizeof p->segs / sizeof *p->segs; i++)
 135                 p->segs[i] = segs[i];
 136 }
 137
 138 static usbd_status
 139 usb_block_allocmem(bus_dma_tag_t tag, size_t size, size_t align,
 140                    usb_dma_block_t **dmap)
 141 {
 142         usb_dma_block_t *p;
 143
 144         DPRINTFN(5, ("usb_block_allocmem: size=%lu align=%lu\n",
 145                      (u_long)size, (u_long)align));
 146
 147         crit_enter();
 148         /* First check the free list. */
 149         for (p = LIST_FIRST(&usb_blk_freelist); p; p = LIST_NEXT(p, next)) {
 150                 if (p->tag == tag && p->size >= size && p->align >= align) {
 151                         LIST_REMOVE(p, next);
 152                         usb_blk_nfree--;
 153                         crit_exit();
 154                         *dmap = p;
 155                         DPRINTFN(6,("usb_block_allocmem: free list size=%lu\n",
 156                                     (u_long)p->size));
 157                         logmemory(blkalloc2, p, NULL, size, align);
 158                         return (USBD_NORMAL_COMPLETION);
 159                 }
 160         }
 161         crit_exit();
 162
 163         DPRINTFN(6, ("usb_block_allocmem: no free\n"));
 164         p = kmalloc(sizeof *p, M_USB, M_INTWAIT);
 165         logmemory(blkalloc, p, NULL, size, align);
 166
 167         if (bus_dma_tag_create(tag, align, 0,
 168             BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
 169             size, sizeof(p->segs) / sizeof(p->segs[0]), size,
 170             BUS_DMA_ALLOCNOW, &p->tag) == ENOMEM)
 171         {
 172                 goto free;
 173         }
 174
 175         p->size = size;
 176         p->align = align;
 177         if (bus_dmamem_alloc(p->tag, &p->kaddr,
 178             BUS_DMA_NOWAIT|BUS_DMA_COHERENT, &p->map))
 179                 goto tagfree;
 180
 181         if (bus_dmamap_load(p->tag, p->map, p->kaddr, p->size,
 182             usbmem_callback, p, 0))
 183                 goto memfree;
 184
 185         /* XXX - override the tag, ok since we never free it */
 186         p->tag = tag;
 187         *dmap = p;
 188         return (USBD_NORMAL_COMPLETION);
 189
 190         /*
 191          * XXX - do we need to _unload? is the order of _free and _destroy
 192          * correct?
 193          */
 194 memfree:
 195         bus_dmamem_free(p->tag, p->kaddr, p->map);
 196 tagfree:
 197         bus_dma_tag_destroy(p->tag);
 198 free:
 199         kfree(p, M_USB);
 200         return (USBD_NOMEM);
 201 }
 202
 203 /*
 204  * Do not free the memory unconditionally since we might be called
 205  * from an interrupt context and that is BAD.
 206  * XXX when should we really free?
 207  */
 208 static void
 209 usb_block_freemem(usb_dma_block_t *p)
 210 {
 211         DPRINTFN(6, ("usb_block_freemem: size=%lu\n", (u_long)p->size));
 212         logmemory(blkfree, p, NULL, p->size, p->align);
 213         crit_enter();
 214         LIST_INSERT_HEAD(&usb_blk_freelist, p, next);
 215         usb_blk_nfree++;
 216         crit_exit();
 217 }
 218
 219 usbd_status
 220 usb_allocmem(usbd_bus_handle bus, size_t size, size_t align, usb_dma_t *p)
 221 {
 222         bus_dma_tag_t tag = bus->dmatag;
 223         usbd_status err;
 224         struct usb_frag_dma *f;
 225         usb_dma_block_t *b;
 226         int i;
 227
 228         /* compat w/ Net/OpenBSD */
 229         if (align == 0)
 230                 align = 1;
 231
 232         /* If the request is large then just use a full block. */
 233         if (size > USB_MEM_SMALL || align > USB_MEM_SMALL) {
 234                 DPRINTFN(1, ("usb_allocmem: large alloc %d\n", (int)size));
 235                 size = (size + USB_MEM_BLOCK - 1) & ~(USB_MEM_BLOCK - 1);
 236                 err = usb_block_allocmem(tag, size, align, &p->block);
 237                 if (!err) {
 238                         p->block->fullblock = 1;
 239                         p->offs = 0;
 240                         p->len = size;
 241                         logmemory(alloc_full, p, NULL, size, align);
 242                 }
 243                 return (err);
 244         }
 245
 246         crit_enter();
 247         /* Check for free fragments. */
 248         for (f = LIST_FIRST(&usb_frag_freelist); f; f = LIST_NEXT(f, next))
 249                 if (f->block->tag == tag)
 250                         break;
 251         if (f == NULL) {
 252                 DPRINTFN(1, ("usb_allocmem: adding fragments\n"));
 253                 err = usb_block_allocmem(tag, USB_MEM_BLOCK, USB_MEM_SMALL,&b);
 254                 if (err) {
 255                         crit_exit();
 256                         return (err);
 257                 }
 258                 b->fullblock = 0;
 259                 /* XXX - override the tag, ok since we never free it */
 260                 b->tag = tag;
 261                 KASSERT(sizeof *f <= USB_MEM_SMALL, ("USB_MEM_SMALL(%d) is too small for struct usb_frag_dma(%zd)\n",
 262                     USB_MEM_SMALL, sizeof *f));
 263                 for (i = 0; i < USB_MEM_BLOCK; i += USB_MEM_SMALL) {
 264                         f = (struct usb_frag_dma *)((char *)b->kaddr + i);
 265                         f->block = b;
 266                         f->offs = i;
 267                         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
 268                 }
 269                 f = LIST_FIRST(&usb_frag_freelist);
 270         }
 271         p->block = f->block;
 272         p->offs = f->offs;
 273         p->len = USB_MEM_SMALL;
 274         LIST_REMOVE(f, next);
 275         crit_exit();
 276         logmemory(alloc_frag, p, NULL, size, align);
 277         DPRINTFN(5, ("usb_allocmem: use frag=%p size=%d\n", f, (int)size));
 278         return (USBD_NORMAL_COMPLETION);
 279 }
 280
 281 void
 282 usb_freemem(usbd_bus_handle bus, usb_dma_t *p)
 283 {
 284         struct usb_frag_dma *f;
 285
 286         if (p->block->fullblock) {
 287                 DPRINTFN(1, ("usb_freemem: large free\n"));
 288                 usb_block_freemem(p->block);
 289                 logmemory(free_full, p, bus, 0, 0);
 290                 return;
 291         }
 292         logmemory(free_frag, p, bus, 0, 0);
 293         f = KERNADDR(p, 0);
 294         f->block = p->block;
 295         f->offs = p->offs;
 296         crit_enter();
 297         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
 298         crit_exit();
 299         DPRINTFN(5, ("usb_freemem: frag=%p\n", f));
 300 }