usb_mem.c

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    1 /*      $NetBSD: usb_mem.c,v 1.26 2003/02/01 06:23:40 thorpej Exp $     */
    2 /*      $FreeBSD: releng/7.4/sys/dev/usb/usb_mem.c 170960 2007-06-20 05:11:37Z imp $    */
    3 
    4 /*-
    5  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software contributed to The NetBSD Foundation
    9  * by Lennart Augustsson (lennart@augustsson.net) at
   10  * Carlstedt Research & Technology.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *        This product includes software developed by the NetBSD
   23  *        Foundation, Inc. and its contributors.
   24  * 4. Neither the name of The NetBSD Foundation nor the names of its
   25  *    contributors may be used to endorse or promote products derived
   26  *    from this software without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   29  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   31  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   32  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   33  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   34  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   35  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   36  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   37  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   38  * POSSIBILITY OF SUCH DAMAGE.
   39  */
   40 
   41 /*
   42  * USB DMA memory allocation.
   43  * We need to allocate a lot of small (many 8 byte, some larger)
   44  * memory blocks that can be used for DMA.  Using the bus_dma
   45  * routines directly would incur large overheads in space and time.
   46  */
   47 
   48 #include <sys/cdefs.h>
   49 __FBSDID("$FreeBSD: releng/7.4/sys/dev/usb/usb_mem.c 170960 2007-06-20 05:11:37Z imp $");
   50 
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/malloc.h>
   54 #include <sys/kernel.h>
   55 #include <sys/endian.h>
   56 #include <sys/module.h>
   57 #include <sys/bus.h>
   58 #include <sys/queue.h>
   59 
   60 #include <machine/bus.h>
   61 #include <machine/endian.h>
   62 
   63 #ifdef DIAGNOSTIC
   64 #include <sys/proc.h>
   65 #endif
   66 
   67 #include <dev/usb/usb.h>
   68 #include <dev/usb/usbdi.h>
   69 #include <dev/usb/usbdivar.h>   /* just for usb_dma_t */
   70 #include <dev/usb/usb_mem.h>
   71 
   72 #ifdef USB_DEBUG
   73 #define DPRINTF(x)      if (usbdebug) printf x
   74 #define DPRINTFN(n,x)   if (usbdebug>(n)) printf x
   75 extern int usbdebug;
   76 #else
   77 #define DPRINTF(x)
   78 #define DPRINTFN(n,x)
   79 #endif
   80 
   81 #define USB_MEM_SMALL 64
   82 #define USB_MEM_CHUNKS (PAGE_SIZE / USB_MEM_SMALL)
   83 #define USB_MEM_BLOCK (USB_MEM_SMALL * USB_MEM_CHUNKS)
   84 
   85 /* This struct is overlayed on free fragments. */
   86 struct usb_frag_dma {
   87         usb_dma_block_t *block;
   88         u_int offs;
   89         LIST_ENTRY(usb_frag_dma) next;
   90 };
   91 
   92 static bus_dmamap_callback_t usbmem_callback;
   93 static usbd_status      usb_block_allocmem(bus_dma_tag_t, size_t, size_t,
   94                                            usb_dma_block_t **);
   95 static void             usb_block_freemem(usb_dma_block_t *);
   96 
   97 static LIST_HEAD(, usb_dma_block) usb_blk_freelist =
   98         LIST_HEAD_INITIALIZER(usb_blk_freelist);
   99 static int usb_blk_nfree = 0;
  100 /* XXX should have different free list for different tags (for speed) */
  101 static LIST_HEAD(, usb_frag_dma) usb_frag_freelist =
  102         LIST_HEAD_INITIALIZER(usb_frag_freelist);
  103 
  104 static void
  105 usbmem_callback(void *arg, bus_dma_segment_t *segs, int nseg, int error)
  106 {
  107         int i;
  108         usb_dma_block_t *p = arg;
  109 
  110         if (error == EFBIG) {
  111                 printf("usb: mapping to large\n");
  112                 return;
  113         }
  114 
  115         p->nsegs = nseg;
  116         for (i = 0; i < nseg && i < sizeof p->segs / sizeof *p->segs; i++)
  117                 p->segs[i] = segs[i];
  118 }
  119 
  120 static usbd_status
  121 usb_block_allocmem(bus_dma_tag_t tag, size_t size, size_t align,
  122                    usb_dma_block_t **dmap)
  123 {
  124         usb_dma_block_t *p;
  125         int s;
  126 
  127         DPRINTFN(5, ("usb_block_allocmem: size=%lu align=%lu\n",
  128                      (u_long)size, (u_long)align));
  129 
  130 #ifdef DIAGNOSTIC
  131         if (!curproc) {
  132                 printf("usb_block_allocmem: in interrupt context, size=%lu\n",
  133                     (unsigned long) size);
  134         }
  135 #endif
  136 
  137         s = splusb();
  138         /* First check the free list. */
  139         for (p = LIST_FIRST(&usb_blk_freelist); p; p = LIST_NEXT(p, next)) {
  140                 if (p->tag == tag && p->size >= size && p->size < size * 2 &&
  141                     p->align >= align) {
  142                         LIST_REMOVE(p, next);
  143                         usb_blk_nfree--;
  144                         splx(s);
  145                         *dmap = p;
  146                         DPRINTFN(6,("usb_block_allocmem: free list size=%lu\n",
  147                                     (u_long)p->size));
  148                         return (USBD_NORMAL_COMPLETION);
  149                 }
  150         }
  151         splx(s);
  152 
  153 #ifdef DIAGNOSTIC
  154         if (!curproc) {
  155                 printf("usb_block_allocmem: in interrupt context, failed\n");
  156                 return (USBD_NOMEM);
  157         }
  158 #endif
  159 
  160         DPRINTFN(6, ("usb_block_allocmem: no free\n"));
  161         p = malloc(sizeof *p, M_USB, M_NOWAIT);
  162         if (p == NULL)
  163                 return (USBD_NOMEM);
  164 
  165         if (bus_dma_tag_create(tag, align, 0,
  166             BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
  167             size, sizeof(p->segs) / sizeof(p->segs[0]), size,
  168             0, NULL, NULL, &p->tag) == ENOMEM)
  169         {
  170                 goto free;
  171         }
  172 
  173         p->size = size;
  174         p->align = align;
  175         if (bus_dmamem_alloc(p->tag, &p->kaddr,
  176             BUS_DMA_NOWAIT|BUS_DMA_COHERENT, &p->map))
  177                 goto tagfree;
  178 
  179         if (bus_dmamap_load(p->tag, p->map, p->kaddr, p->size,
  180             usbmem_callback, p, 0))
  181                 goto memfree;
  182 
  183         /* XXX - override the tag, ok since we never free it */
  184         p->tag = tag;
  185         *dmap = p;
  186         return (USBD_NORMAL_COMPLETION);
  187 
  188         /*
  189          * XXX - do we need to _unload? is the order of _free and _destroy
  190          * correct?
  191          */
  192 memfree:
  193         bus_dmamem_free(p->tag, p->kaddr, p->map);
  194 tagfree:
  195         bus_dma_tag_destroy(p->tag);
  196 free:
  197         free(p, M_USB);
  198         return (USBD_NOMEM);
  199 }
  200 
  201 /*
  202  * Do not free the memory unconditionally since we might be called
  203  * from an interrupt context and that is BAD.
  204  * XXX when should we really free?
  205  */
  206 static void
  207 usb_block_freemem(usb_dma_block_t *p)
  208 {
  209         int s;
  210 
  211         DPRINTFN(6, ("usb_block_freemem: size=%lu\n", (u_long)p->size));
  212         s = splusb();
  213         LIST_INSERT_HEAD(&usb_blk_freelist, p, next);
  214         usb_blk_nfree++;
  215         splx(s);
  216 }
  217 
  218 usbd_status
  219 usb_allocmem(usbd_bus_handle bus, size_t size, size_t align, usb_dma_t *p)
  220 {
  221         bus_dma_tag_t tag = bus->parent_dmatag;
  222         usbd_status err;
  223         struct usb_frag_dma *f;
  224         usb_dma_block_t *b;
  225         int i;
  226         int s;
  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                 }
  242                 return (err);
  243         }
  244 
  245         s = splusb();
  246         /* Check for free fragments. */
  247         for (f = LIST_FIRST(&usb_frag_freelist); f; f = LIST_NEXT(f, next))
  248                 if (f->block->tag == tag)
  249                         break;
  250         if (f == NULL) {
  251                 DPRINTFN(1, ("usb_allocmem: adding fragments\n"));
  252                 err = usb_block_allocmem(tag, USB_MEM_BLOCK, USB_MEM_SMALL,&b);
  253                 if (err) {
  254                         splx(s);
  255                         return (err);
  256                 }
  257                 b->fullblock = 0;
  258                 /* XXX - override the tag, ok since we never free it */
  259                 b->tag = tag;
  260                 KASSERT(sizeof *f <= USB_MEM_SMALL, ("USB_MEM_SMALL(%d) is too small for struct usb_frag_dma(%zd)\n",
  261                     USB_MEM_SMALL, sizeof *f));
  262                 for (i = 0; i < USB_MEM_BLOCK; i += USB_MEM_SMALL) {
  263                         f = (struct usb_frag_dma *)((char *)b->kaddr + i);
  264                         f->block = b;
  265                         f->offs = i;
  266                         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  267                 }
  268                 f = LIST_FIRST(&usb_frag_freelist);
  269         }
  270         p->block = f->block;
  271         p->offs = f->offs;
  272         p->len = USB_MEM_SMALL;
  273         LIST_REMOVE(f, next);
  274         splx(s);
  275         DPRINTFN(5, ("usb_allocmem: use frag=%p size=%d\n", f, (int)size));
  276         return (USBD_NORMAL_COMPLETION);
  277 }
  278 
  279 void
  280 usb_freemem(usbd_bus_handle bus, usb_dma_t *p)
  281 {
  282         struct usb_frag_dma *f;
  283         int s;
  284 
  285         if (p->block->fullblock) {
  286                 DPRINTFN(1, ("usb_freemem: large free\n"));
  287                 usb_block_freemem(p->block);
  288                 return;
  289         }
  290         f = KERNADDR(p, 0);
  291         f->block = p->block;
  292         f->offs = p->offs;
  293         s = splusb();
  294         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  295         splx(s);
  296         DPRINTFN(5, ("usb_freemem: frag=%p\n", f));
  297 }
Cache object: cfa364d15c263876a881db5148127749
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FreeBSD/Linux Kernel Cross Reference sys/dev/usb/usb_mem.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/usb_mem.c
