usb_mem.c

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    1 /*      $NetBSD: usb_mem.c,v 1.37 2008/06/28 17:42:53 bouyer Exp $      */
    2 
    3 /*
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Lennart Augustsson (lennart@augustsson.net) at
    9  * Carlstedt Research & Technology.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   30  * POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 /*
   34  * USB DMA memory allocation.
   35  * We need to allocate a lot of small (many 8 byte, some larger)
   36  * memory blocks that can be used for DMA.  Using the bus_dma
   37  * routines directly would incur large overheads in space and time.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __KERNEL_RCSID(0, "$NetBSD: usb_mem.c,v 1.37 2008/06/28 17:42:53 bouyer Exp $");
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/kernel.h>
   46 #include <sys/malloc.h>
   47 #include <sys/queue.h>
   48 #include <sys/device.h>         /* for usbdivar.h */
   49 #include <sys/bus.h>
   50 
   51 #ifdef __NetBSD__
   52 #include <sys/extent.h>
   53 #include <uvm/uvm_extern.h>
   54 #endif
   55 
   56 #ifdef DIAGNOSTIC
   57 #include <sys/proc.h>
   58 #endif
   59 
   60 #include <dev/usb/usb.h>
   61 #include <dev/usb/usbdi.h>
   62 #include <dev/usb/usbdivar.h>   /* just for usb_dma_t */
   63 #include <dev/usb/usb_mem.h>
   64 
   65 #ifdef USB_DEBUG
   66 #define DPRINTF(x)      if (usbdebug) logprintf x
   67 #define DPRINTFN(n,x)   if (usbdebug>(n)) logprintf x
   68 extern int usbdebug;
   69 #else
   70 #define DPRINTF(x)
   71 #define DPRINTFN(n,x)
   72 #endif
   73 
   74 MALLOC_DEFINE(M_USB, "USB", "USB misc. memory");
   75 MALLOC_DEFINE(M_USBDEV, "USB device", "USB device driver");
   76 MALLOC_DEFINE(M_USBHC, "USB HC", "USB host controller");
   77 
   78 #define USB_MEM_SMALL 64
   79 #define USB_MEM_CHUNKS 64
   80 #define USB_MEM_BLOCK (USB_MEM_SMALL * USB_MEM_CHUNKS)
   81 
   82 /* This struct is overlayed on free fragments. */
   83 struct usb_frag_dma {
   84         usb_dma_block_t *block;
   85         u_int offs;
   86         LIST_ENTRY(usb_frag_dma) next;
   87 };
   88 
   89 Static usbd_status      usb_block_allocmem(bus_dma_tag_t, size_t, size_t,
   90                                            usb_dma_block_t **);
   91 Static void             usb_block_freemem(usb_dma_block_t *);
   92 
   93 Static LIST_HEAD(, usb_dma_block) usb_blk_freelist =
   94         LIST_HEAD_INITIALIZER(usb_blk_freelist);
   95 Static int usb_blk_nfree = 0;
   96 /* XXX should have different free list for different tags (for speed) */
   97 Static LIST_HEAD(, usb_frag_dma) usb_frag_freelist =
   98         LIST_HEAD_INITIALIZER(usb_frag_freelist);
   99 
  100 Static usbd_status
  101 usb_block_allocmem(bus_dma_tag_t tag, size_t size, size_t align,
  102                    usb_dma_block_t **dmap)
  103 {
  104         int error;
  105         usb_dma_block_t *p;
  106         int s;
  107 
  108         DPRINTFN(5, ("usb_block_allocmem: size=%lu align=%lu\n",
  109                      (u_long)size, (u_long)align));
  110 
  111 #ifdef DIAGNOSTIC
  112         if (!curproc) {
  113                 printf("usb_block_allocmem: in interrupt context, size=%lu\n",
  114                     (unsigned long) size);
  115         }
  116 #endif
  117 
  118         s = splusb();
  119         /* First check the free list. */
  120         for (p = LIST_FIRST(&usb_blk_freelist); p; p = LIST_NEXT(p, next)) {
  121                 if (p->tag == tag && p->size >= size && p->align >= align) {
  122                         LIST_REMOVE(p, next);
  123                         usb_blk_nfree--;
  124                         splx(s);
  125                         *dmap = p;
  126                         DPRINTFN(6,("usb_block_allocmem: free list size=%lu\n",
  127                                     (u_long)p->size));
  128                         return (USBD_NORMAL_COMPLETION);
  129                 }
  130         }
  131         splx(s);
  132 
  133 #ifdef DIAGNOSTIC
  134         if (!curproc) {
  135                 printf("usb_block_allocmem: in interrupt context, failed\n");
  136                 return (USBD_NOMEM);
  137         }
  138 #endif
  139 
  140         DPRINTFN(6, ("usb_block_allocmem: no free\n"));
  141         p = malloc(sizeof *p, M_USB, M_NOWAIT);
  142         if (p == NULL)
  143                 return (USBD_NOMEM);
  144 
  145         p->tag = tag;
  146         p->size = size;
  147         p->align = align;
  148         error = bus_dmamem_alloc(tag, p->size, align, 0,
  149                                  p->segs, sizeof(p->segs)/sizeof(p->segs[0]),
  150                                  &p->nsegs, BUS_DMA_NOWAIT);
  151         if (error)
  152                 goto free0;
  153 
  154         error = bus_dmamem_map(tag, p->segs, p->nsegs, p->size,
  155                                &p->kaddr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
  156         if (error)
  157                 goto free1;
  158 
  159         error = bus_dmamap_create(tag, p->size, 1, p->size,
  160                                   0, BUS_DMA_NOWAIT, &p->map);
  161         if (error)
  162                 goto unmap;
  163 
  164         error = bus_dmamap_load(tag, p->map, p->kaddr, p->size, NULL,
  165                                 BUS_DMA_NOWAIT);
  166         if (error)
  167                 goto destroy;
  168 
  169         *dmap = p;
  170         return (USBD_NORMAL_COMPLETION);
  171 
  172  destroy:
  173         bus_dmamap_destroy(tag, p->map);
  174  unmap:
  175         bus_dmamem_unmap(tag, p->kaddr, p->size);
  176  free1:
  177         bus_dmamem_free(tag, p->segs, p->nsegs);
  178  free0:
  179         free(p, M_USB);
  180         return (USBD_NOMEM);
  181 }
  182 
  183 #if 0
  184 void
  185 usb_block_real_freemem(usb_dma_block_t *p)
  186 {
  187 #ifdef DIAGNOSTIC
  188         if (!curproc) {
  189                 printf("usb_block_real_freemem: in interrupt context\n");
  190                 return;
  191         }
  192 #endif
  193         bus_dmamap_unload(p->tag, p->map);
  194         bus_dmamap_destroy(p->tag, p->map);
  195         bus_dmamem_unmap(p->tag, p->kaddr, p->size);
  196         bus_dmamem_free(p->tag, p->segs, p->nsegs);
  197         free(p, M_USB);
  198 }
  199 #endif
  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->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         /* If the request is large then just use a full block. */
  229         if (size > USB_MEM_SMALL || align > USB_MEM_SMALL) {
  230                 DPRINTFN(1, ("usb_allocmem: large alloc %d\n", (int)size));
  231                 size = (size + USB_MEM_BLOCK - 1) & ~(USB_MEM_BLOCK - 1);
  232                 err = usb_block_allocmem(tag, size, align, &p->block);
  233                 if (!err) {
  234                         p->block->flags = USB_DMA_FULLBLOCK;
  235                         p->offs = 0;
  236                 }
  237                 return (err);
  238         }
  239 
  240         s = splusb();
  241         /* Check for free fragments. */
  242         for (f = LIST_FIRST(&usb_frag_freelist); f; f = LIST_NEXT(f, next))
  243                 if (f->block->tag == tag)
  244                         break;
  245         if (f == NULL) {
  246                 DPRINTFN(1, ("usb_allocmem: adding fragments\n"));
  247                 err = usb_block_allocmem(tag, USB_MEM_BLOCK, USB_MEM_SMALL,&b);
  248                 if (err) {
  249                         splx(s);
  250                         return (err);
  251                 }
  252                 b->flags = 0;
  253                 for (i = 0; i < USB_MEM_BLOCK; i += USB_MEM_SMALL) {
  254                         f = (struct usb_frag_dma *)((char *)b->kaddr + i);
  255                         f->block = b;
  256                         f->offs = i;
  257                         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  258                 }
  259                 f = LIST_FIRST(&usb_frag_freelist);
  260         }
  261         p->block = f->block;
  262         p->offs = f->offs;
  263         p->block->flags &= ~USB_DMA_RESERVE;
  264         LIST_REMOVE(f, next);
  265         splx(s);
  266         DPRINTFN(5, ("usb_allocmem: use frag=%p size=%d\n", f, (int)size));
  267         return (USBD_NORMAL_COMPLETION);
  268 }
  269 
  270 void
  271 usb_freemem(usbd_bus_handle bus, usb_dma_t *p)
  272 {
  273         struct usb_frag_dma *f;
  274         int s;
  275 
  276         if (p->block->flags & USB_DMA_FULLBLOCK) {
  277                 DPRINTFN(1, ("usb_freemem: large free\n"));
  278                 usb_block_freemem(p->block);
  279                 return;
  280         }
  281         f = KERNADDR(p, 0);
  282         f->block = p->block;
  283         f->offs = p->offs;
  284         s = splusb();
  285         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  286         splx(s);
  287         DPRINTFN(5, ("usb_freemem: frag=%p\n", f));
  288 }
  289 
  290 void
  291 usb_syncmem(usb_dma_t *p, bus_addr_t offset, bus_size_t len, int ops)
  292 {
  293         bus_dmamap_sync(p->block->tag, p->block->map, p->offs + offset,
  294             len, ops);
  295 }
  296 
  297 
  298 #ifdef __NetBSD__
  299 usbd_status
  300 usb_reserve_allocm(struct usb_dma_reserve *rs, usb_dma_t *dma, u_int32_t size)
  301 {
  302         int error;
  303         u_long start;
  304         bus_addr_t baddr;
  305 
  306         if (rs->vaddr == 0)
  307                 return USBD_NOMEM;
  308 
  309         dma->block = malloc(sizeof *dma->block, M_USB, M_ZERO | M_NOWAIT);
  310         if (dma->block == NULL)
  311                 return USBD_NOMEM;
  312 
  313         error = extent_alloc(rs->extent, size, PAGE_SIZE, 0,
  314             EX_NOWAIT, &start);
  315 
  316         if (error != 0) {
  317                 aprint_error_dev(rs->dv,
  318                     "usb_reserve_allocm of size %u failed (error %d)\n",
  319                     size, error);
  320                 return USBD_NOMEM;
  321         }
  322 
  323         baddr = start;
  324         dma->offs = baddr - rs->paddr;
  325         dma->block->flags = USB_DMA_RESERVE;
  326         dma->block->align = PAGE_SIZE;
  327         dma->block->size = size;
  328         dma->block->nsegs = 1;
  329         /* XXX segs appears to be unused */
  330         dma->block->segs[0] = rs->map->dm_segs[0];
  331         dma->block->map = rs->map;
  332         dma->block->kaddr = rs->vaddr;
  333         dma->block->tag = rs->dtag;
  334 
  335         return USBD_NORMAL_COMPLETION;
  336 }
  337 
  338 void
  339 usb_reserve_freem(struct usb_dma_reserve *rs, usb_dma_t *dma)
  340 {
  341         int error;
  342 
  343         error = extent_free(rs->extent,
  344             (u_long)(rs->paddr + dma->offs), dma->block->size, 0);
  345         free(dma->block, M_USB);
  346 }
  347 
  348 int
  349 usb_setup_reserve(device_t dv, struct usb_dma_reserve *rs, bus_dma_tag_t dtag,
  350                   size_t size)
  351 {
  352         int error, nseg;
  353         bus_dma_segment_t seg;
  354 
  355         rs->dtag = dtag;
  356         rs->size = size;
  357         rs->dv = dv;
  358 
  359         error = bus_dmamem_alloc(dtag, USB_MEM_RESERVE, PAGE_SIZE, 0,
  360             &seg, 1, &nseg, BUS_DMA_NOWAIT);
  361         if (error != 0)
  362                 return error;
  363 
  364         error = bus_dmamem_map(dtag, &seg, nseg, USB_MEM_RESERVE,
  365             &rs->vaddr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
  366         if (error != 0)
  367                 goto freeit;
  368 
  369         error = bus_dmamap_create(dtag, USB_MEM_RESERVE, 1,
  370             USB_MEM_RESERVE, 0, BUS_DMA_NOWAIT, &rs->map);
  371         if (error != 0)
  372                 goto unmap;
  373 
  374         error = bus_dmamap_load(dtag, rs->map, rs->vaddr, USB_MEM_RESERVE,
  375             NULL, BUS_DMA_NOWAIT);
  376         if (error != 0)
  377                 goto destroy;
  378 
  379         rs->paddr = rs->map->dm_segs[0].ds_addr;
  380         rs->extent = extent_create(device_xname(dv), (u_long)rs->paddr,
  381             (u_long)(rs->paddr + USB_MEM_RESERVE),
  382             M_USB, 0, 0, 0);
  383         if (rs->extent == NULL) {
  384                 rs->vaddr = 0;
  385                 return ENOMEM;
  386         }
  387 
  388         return 0;
  389 
  390  destroy:
  391         bus_dmamap_destroy(dtag, rs->map);
  392  unmap:
  393         bus_dmamem_unmap(dtag, rs->vaddr, size);
  394  freeit:
  395         bus_dmamem_free(dtag, &seg, nseg);
  396 
  397         rs->vaddr = 0;
  398 
  399         return error;
  400 }
  401 #endif
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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
