usb_mem.c

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    1 /*      $NetBSD: usb_mem.c,v 1.31.2.1 2008/08/31 16:48:29 jdc 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  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *        This product includes software developed by the NetBSD
   22  *        Foundation, Inc. and its contributors.
   23  * 4. Neither the name of The NetBSD Foundation nor the names of its
   24  *    contributors may be used to endorse or promote products derived
   25  *    from this software without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 /*
   41  * USB DMA memory allocation.
   42  * We need to allocate a lot of small (many 8 byte, some larger)
   43  * memory blocks that can be used for DMA.  Using the bus_dma
   44  * routines directly would incur large overheads in space and time.
   45  */
   46 
   47 #include <sys/cdefs.h>
   48 __KERNEL_RCSID(0, "$NetBSD: usb_mem.c,v 1.31.2.1 2008/08/31 16:48:29 jdc Exp $");
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/kernel.h>
   53 #include <sys/malloc.h>
   54 #include <sys/queue.h>
   55 #include <sys/device.h>         /* for usbdivar.h */
   56 #include <machine/bus.h>
   57 
   58 #ifdef __NetBSD__
   59 #include <sys/extent.h>
   60 #include <uvm/uvm_extern.h>
   61 #endif
   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) logprintf x
   74 #define DPRINTFN(n,x)   if (usbdebug>(n)) logprintf x
   75 extern int usbdebug;
   76 #else
   77 #define DPRINTF(x)
   78 #define DPRINTFN(n,x)
   79 #endif
   80 
   81 MALLOC_DEFINE(M_USB, "USB", "USB misc. memory");
   82 MALLOC_DEFINE(M_USBDEV, "USB device", "USB device driver");
   83 MALLOC_DEFINE(M_USBHC, "USB HC", "USB host controller");
   84 
   85 #define USB_MEM_SMALL 64
   86 #define USB_MEM_CHUNKS 64
   87 #define USB_MEM_BLOCK (USB_MEM_SMALL * USB_MEM_CHUNKS)
   88 
   89 /* This struct is overlayed on free fragments. */
   90 struct usb_frag_dma {
   91         usb_dma_block_t *block;
   92         u_int offs;
   93         LIST_ENTRY(usb_frag_dma) next;
   94 };
   95 
   96 Static usbd_status      usb_block_allocmem(bus_dma_tag_t, size_t, size_t,
   97                                            usb_dma_block_t **);
   98 Static void             usb_block_freemem(usb_dma_block_t *);
   99 
  100 Static LIST_HEAD(, usb_dma_block) usb_blk_freelist =
  101         LIST_HEAD_INITIALIZER(usb_blk_freelist);
  102 Static int usb_blk_nfree = 0;
  103 /* XXX should have different free list for different tags (for speed) */
  104 Static LIST_HEAD(, usb_frag_dma) usb_frag_freelist =
  105         LIST_HEAD_INITIALIZER(usb_frag_freelist);
  106 
  107 Static usbd_status
  108 usb_block_allocmem(bus_dma_tag_t tag, size_t size, size_t align,
  109                    usb_dma_block_t **dmap)
  110 {
  111         int error;
  112         usb_dma_block_t *p;
  113         int s;
  114 
  115         DPRINTFN(5, ("usb_block_allocmem: size=%lu align=%lu\n",
  116                      (u_long)size, (u_long)align));
  117 
  118 #ifdef DIAGNOSTIC
  119         if (!curproc) {
  120                 printf("usb_block_allocmem: in interrupt context, size=%lu\n",
  121                     (unsigned long) size);
  122         }
  123 #endif
  124 
  125         s = splusb();
  126         /* First check the free list. */
  127         for (p = LIST_FIRST(&usb_blk_freelist); p; p = LIST_NEXT(p, next)) {
  128                 if (p->tag == tag && p->size >= size && p->align >= align) {
  129                         LIST_REMOVE(p, next);
  130                         usb_blk_nfree--;
  131                         splx(s);
  132                         *dmap = p;
  133                         DPRINTFN(6,("usb_block_allocmem: free list size=%lu\n",
  134                                     (u_long)p->size));
  135                         return (USBD_NORMAL_COMPLETION);
  136                 }
  137         }
  138         splx(s);
  139 
  140 #ifdef DIAGNOSTIC
  141         if (!curproc) {
  142                 printf("usb_block_allocmem: in interrupt context, failed\n");
  143                 return (USBD_NOMEM);
  144         }
  145 #endif
  146 
  147         DPRINTFN(6, ("usb_block_allocmem: no free\n"));
  148         p = malloc(sizeof *p, M_USB, M_NOWAIT);
  149         if (p == NULL)
  150                 return (USBD_NOMEM);
  151 
  152         p->tag = tag;
  153         p->size = size;
  154         p->align = align;
  155         error = bus_dmamem_alloc(tag, p->size, align, 0,
  156                                  p->segs, sizeof(p->segs)/sizeof(p->segs[0]),
  157                                  &p->nsegs, BUS_DMA_NOWAIT);
  158         if (error)
  159                 goto free0;
  160 
  161         error = bus_dmamem_map(tag, p->segs, p->nsegs, p->size,
  162                                &p->kaddr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
  163         if (error)
  164                 goto free1;
  165 
  166         error = bus_dmamap_create(tag, p->size, 1, p->size,
  167                                   0, BUS_DMA_NOWAIT, &p->map);
  168         if (error)
  169                 goto unmap;
  170 
  171         error = bus_dmamap_load(tag, p->map, p->kaddr, p->size, NULL,
  172                                 BUS_DMA_NOWAIT);
  173         if (error)
  174                 goto destroy;
  175 
  176         *dmap = p;
  177         return (USBD_NORMAL_COMPLETION);
  178 
  179  destroy:
  180         bus_dmamap_destroy(tag, p->map);
  181  unmap:
  182         bus_dmamem_unmap(tag, p->kaddr, p->size);
  183  free1:
  184         bus_dmamem_free(tag, p->segs, p->nsegs);
  185  free0:
  186         free(p, M_USB);
  187         return (USBD_NOMEM);
  188 }
  189 
  190 #if 0
  191 void
  192 usb_block_real_freemem(usb_dma_block_t *p)
  193 {
  194 #ifdef DIAGNOSTIC
  195         if (!curproc) {
  196                 printf("usb_block_real_freemem: in interrupt context\n");
  197                 return;
  198         }
  199 #endif
  200         bus_dmamap_unload(p->tag, p->map);
  201         bus_dmamap_destroy(p->tag, p->map);
  202         bus_dmamem_unmap(p->tag, p->kaddr, p->size);
  203         bus_dmamem_free(p->tag, p->segs, p->nsegs);
  204         free(p, M_USB);
  205 }
  206 #endif
  207 
  208 /*
  209  * Do not free the memory unconditionally since we might be called
  210  * from an interrupt context and that is BAD.
  211  * XXX when should we really free?
  212  */
  213 Static void
  214 usb_block_freemem(usb_dma_block_t *p)
  215 {
  216         int s;
  217 
  218         DPRINTFN(6, ("usb_block_freemem: size=%lu\n", (u_long)p->size));
  219         s = splusb();
  220         LIST_INSERT_HEAD(&usb_blk_freelist, p, next);
  221         usb_blk_nfree++;
  222         splx(s);
  223 }
  224 
  225 usbd_status
  226 usb_allocmem(usbd_bus_handle bus, size_t size, size_t align, usb_dma_t *p)
  227 {
  228         bus_dma_tag_t tag = bus->dmatag;
  229         usbd_status err;
  230         struct usb_frag_dma *f;
  231         usb_dma_block_t *b;
  232         int i;
  233         int s;
  234 
  235         /* If the request is large then just use a full block. */
  236         if (size > USB_MEM_SMALL || align > USB_MEM_SMALL) {
  237                 DPRINTFN(1, ("usb_allocmem: large alloc %d\n", (int)size));
  238                 size = (size + USB_MEM_BLOCK - 1) & ~(USB_MEM_BLOCK - 1);
  239                 err = usb_block_allocmem(tag, size, align, &p->block);
  240                 if (!err) {
  241                         p->block->flags = USB_DMA_FULLBLOCK;
  242                         p->offs = 0;
  243                 }
  244                 return (err);
  245         }
  246 
  247         s = splusb();
  248         /* Check for free fragments. */
  249         for (f = LIST_FIRST(&usb_frag_freelist); f; f = LIST_NEXT(f, next))
  250                 if (f->block->tag == tag)
  251                         break;
  252         if (f == NULL) {
  253                 DPRINTFN(1, ("usb_allocmem: adding fragments\n"));
  254                 err = usb_block_allocmem(tag, USB_MEM_BLOCK, USB_MEM_SMALL,&b);
  255                 if (err) {
  256                         splx(s);
  257                         return (err);
  258                 }
  259                 b->flags = 0;
  260                 for (i = 0; i < USB_MEM_BLOCK; i += USB_MEM_SMALL) {
  261                         f = (struct usb_frag_dma *)(b->kaddr + i);
  262                         f->block = b;
  263                         f->offs = i;
  264                         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  265                 }
  266                 f = LIST_FIRST(&usb_frag_freelist);
  267         }
  268         p->block = f->block;
  269         p->offs = f->offs;
  270         p->block->flags &= ~USB_DMA_RESERVE;
  271         LIST_REMOVE(f, next);
  272         splx(s);
  273         DPRINTFN(5, ("usb_allocmem: use frag=%p size=%d\n", f, (int)size));
  274         return (USBD_NORMAL_COMPLETION);
  275 }
  276 
  277 void
  278 usb_freemem(usbd_bus_handle bus, usb_dma_t *p)
  279 {
  280         struct usb_frag_dma *f;
  281         int s;
  282 
  283         if (p->block->flags & USB_DMA_FULLBLOCK) {
  284                 DPRINTFN(1, ("usb_freemem: large free\n"));
  285                 usb_block_freemem(p->block);
  286                 return;
  287         }
  288         f = KERNADDR(p, 0);
  289         f->block = p->block;
  290         f->offs = p->offs;
  291         s = splusb();
  292         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  293         splx(s);
  294         DPRINTFN(5, ("usb_freemem: frag=%p\n", f));
  295 }
  296 
  297 void
  298 usb_syncmem(usb_dma_t *p, bus_addr_t offset, bus_size_t len, int ops)
  299 {
  300         bus_dmamap_sync(p->block->tag, p->block->map, p->offs + offset,
  301             len, ops);
  302 }
  303 
  304 
  305 #ifdef __NetBSD__
  306 usbd_status
  307 usb_reserve_allocm(struct usb_dma_reserve *rs, usb_dma_t *dma, u_int32_t size)
  308 {
  309         int error;
  310         u_long start;
  311         bus_addr_t baddr;
  312 
  313         if (rs->vaddr == 0)
  314                 return USBD_NOMEM;
  315 
  316         dma->block = malloc(sizeof *dma->block, M_USB, M_ZERO | M_NOWAIT);
  317         if (dma->block == NULL)
  318                 return USBD_NOMEM;
  319 
  320         error = extent_alloc(rs->extent, size, PAGE_SIZE, 0,
  321             EX_NOWAIT, &start);
  322 
  323         if (error != 0) {
  324                 printf("%s: usb_reserve_allocm of size %u failed (error %d)\n",
  325                     ((struct device *)rs->softc)->dv_xname, size, error);
  326                 return USBD_NOMEM;
  327         }
  328 
  329         baddr = start;
  330         dma->offs = baddr - rs->paddr;
  331         dma->block->flags = USB_DMA_RESERVE;
  332         dma->block->align = PAGE_SIZE;
  333         dma->block->size = size;
  334         dma->block->nsegs = 1;
  335         /* XXX segs appears to be unused */
  336         dma->block->segs[0] = rs->map->dm_segs[0];
  337         dma->block->map = rs->map;
  338         dma->block->kaddr = rs->vaddr;
  339         dma->block->tag = rs->dtag;
  340 
  341         return USBD_NORMAL_COMPLETION;
  342 }
  343 
  344 void
  345 usb_reserve_freem(struct usb_dma_reserve *rs, usb_dma_t *dma)
  346 {
  347         int error;
  348 
  349         error = extent_free(rs->extent,
  350             (u_long)(rs->paddr + dma->offs), dma->block->size, 0);
  351         free(dma->block, M_USB);
  352 }
  353 
  354 int
  355 usb_setup_reserve(void *softc, struct usb_dma_reserve *rs, bus_dma_tag_t dtag,
  356                   size_t size)
  357 {
  358         int error, nseg;
  359         bus_dma_segment_t seg;
  360         struct device *dv = softc;
  361 
  362         rs->dtag = dtag;
  363         rs->size = size;
  364         rs->softc = softc;
  365 
  366         error = bus_dmamem_alloc(dtag, USB_MEM_RESERVE, PAGE_SIZE, 0,
  367             &seg, 1, &nseg, BUS_DMA_NOWAIT);
  368         if (error != 0)
  369                 return error;
  370 
  371         error = bus_dmamem_map(dtag, &seg, nseg, USB_MEM_RESERVE,
  372             &rs->vaddr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
  373         if (error != 0)
  374                 goto freeit;
  375 
  376         error = bus_dmamap_create(dtag, USB_MEM_RESERVE, 1,
  377             USB_MEM_RESERVE, 0, BUS_DMA_NOWAIT, &rs->map);
  378         if (error != 0)
  379                 goto unmap;
  380 
  381         error = bus_dmamap_load(dtag, rs->map, rs->vaddr, USB_MEM_RESERVE,
  382             NULL, BUS_DMA_NOWAIT);
  383         if (error != 0)
  384                 goto destroy;
  385 
  386         rs->paddr = rs->map->dm_segs[0].ds_addr;
  387         rs->extent = extent_create(dv->dv_xname, (u_long)rs->paddr,
  388             (u_long)(rs->paddr + USB_MEM_RESERVE),
  389             M_USB, 0, 0, 0);
  390         if (rs->extent == NULL) {
  391                 rs->vaddr = 0;
  392                 return ENOMEM;
  393         }
  394 
  395         return 0;
  396 
  397  destroy:
  398         bus_dmamap_destroy(dtag, rs->map);
  399  unmap:
  400         bus_dmamem_unmap(dtag, rs->vaddr, size);
  401  freeit:
  402         bus_dmamem_free(dtag, &seg, nseg);
  403 
  404         rs->vaddr = 0;
  405 
  406         return error;
  407 }
  408 #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
