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

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    1 /*      $NetBSD: usb_mem.c,v 1.46 2011/03/20 17:38:11 tsutsui 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 1.46 2011/03/20 17:38:11 tsutsui Exp $");
   42 
   43 #ifdef _KERNEL_OPT
   44 #include "opt_usb.h"
   45 #endif
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/kernel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/queue.h>
   52 #include <sys/device.h>         /* for usbdivar.h */
   53 #include <sys/bus.h>
   54 #include <sys/cpu.h>
   55 
   56 #ifdef __NetBSD__
   57 #include <sys/extent.h>
   58 #endif
   59 
   60 #ifdef DIAGNOSTIC
   61 #include <sys/proc.h>
   62 #endif
   63 
   64 #include <dev/usb/usb.h>
   65 #include <dev/usb/usbdi.h>
   66 #include <dev/usb/usbdivar.h>   /* just for usb_dma_t */
   67 #include <dev/usb/usb_mem.h>
   68 
   69 #ifdef USB_DEBUG
   70 #define DPRINTF(x)      if (usbdebug) printf x
   71 #define DPRINTFN(n,x)   if (usbdebug>(n)) printf x
   72 extern int usbdebug;
   73 #else
   74 #define DPRINTF(x)
   75 #define DPRINTFN(n,x)
   76 #endif
   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 (cpu_intr_p()) {
  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         LIST_FOREACH(p, &usb_blk_freelist, 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 (cpu_intr_p()) {
  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 #ifdef USB_FRAG_DMA_WORKAROUND
  171         memset(p->kaddr, 0, p->size);
  172 #endif
  173         return (USBD_NORMAL_COMPLETION);
  174 
  175  destroy:
  176         bus_dmamap_destroy(tag, p->map);
  177  unmap:
  178         bus_dmamem_unmap(tag, p->kaddr, p->size);
  179  free1:
  180         bus_dmamem_free(tag, p->segs, p->nsegs);
  181  free0:
  182         free(p, M_USB);
  183         return (USBD_NOMEM);
  184 }
  185 
  186 #if 0
  187 void
  188 usb_block_real_freemem(usb_dma_block_t *p)
  189 {
  190 #ifdef DIAGNOSTIC
  191         if (cpu_intr_p()) {
  192                 printf("usb_block_real_freemem: in interrupt context\n");
  193                 return;
  194         }
  195 #endif
  196         bus_dmamap_unload(p->tag, p->map);
  197         bus_dmamap_destroy(p->tag, p->map);
  198         bus_dmamem_unmap(p->tag, p->kaddr, p->size);
  199         bus_dmamem_free(p->tag, p->segs, p->nsegs);
  200         free(p, M_USB);
  201 }
  202 #endif
  203 
  204 /*
  205  * Do not free the memory unconditionally since we might be called
  206  * from an interrupt context and that is BAD.
  207  * XXX when should we really free?
  208  */
  209 Static void
  210 usb_block_freemem(usb_dma_block_t *p)
  211 {
  212         int s;
  213 
  214         DPRINTFN(6, ("usb_block_freemem: size=%lu\n", (u_long)p->size));
  215         s = splusb();
  216         LIST_INSERT_HEAD(&usb_blk_freelist, p, next);
  217         usb_blk_nfree++;
  218         splx(s);
  219 }
  220 
  221 usbd_status
  222 usb_allocmem(usbd_bus_handle bus, size_t size, size_t align, usb_dma_t *p)
  223 {
  224         bus_dma_tag_t tag = bus->dmatag;
  225         usbd_status err;
  226         struct usb_frag_dma *f;
  227         usb_dma_block_t *b;
  228         int i;
  229         int s;
  230 
  231         /* If the request is large then just use a full block. */
  232         if (size > USB_MEM_SMALL || align > USB_MEM_SMALL) {
  233                 DPRINTFN(1, ("usb_allocmem: large alloc %d\n", (int)size));
  234                 size = (size + USB_MEM_BLOCK - 1) & ~(USB_MEM_BLOCK - 1);
  235                 err = usb_block_allocmem(tag, size, align, &p->block);
  236                 if (!err) {
  237                         p->block->flags = USB_DMA_FULLBLOCK;
  238                         p->offs = 0;
  239                 }
  240                 return (err);
  241         }
  242 
  243         s = splusb();
  244         /* Check for free fragments. */
  245         LIST_FOREACH(f, &usb_frag_freelist, next) {
  246                 if (f->block->tag == tag)
  247                         break;
  248         }
  249         if (f == NULL) {
  250                 DPRINTFN(1, ("usb_allocmem: adding fragments\n"));
  251                 err = usb_block_allocmem(tag, USB_MEM_BLOCK, USB_MEM_SMALL,&b);
  252                 if (err) {
  253                         splx(s);
  254                         return (err);
  255                 }
  256                 b->flags = 0;
  257                 for (i = 0; i < USB_MEM_BLOCK; i += USB_MEM_SMALL) {
  258                         f = (struct usb_frag_dma *)((char *)b->kaddr + i);
  259                         f->block = b;
  260                         f->offs = i;
  261                         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  262 #ifdef USB_FRAG_DMA_WORKAROUND
  263                         i += 1 * USB_MEM_SMALL;
  264 #endif
  265                 }
  266                 f = LIST_FIRST(&usb_frag_freelist);
  267         }
  268         p->block = f->block;
  269         p->offs = f->offs;
  270 #ifdef USB_FRAG_DMA_WORKAROUND
  271         p->offs += USB_MEM_SMALL;
  272 #endif
  273         p->block->flags &= ~USB_DMA_RESERVE;
  274         LIST_REMOVE(f, next);
  275         splx(s);
  276         DPRINTFN(5, ("usb_allocmem: use frag=%p size=%d\n", f, (int)size));
  277         return (USBD_NORMAL_COMPLETION);
  278 }
  279 
  280 void
  281 usb_freemem(usbd_bus_handle bus, usb_dma_t *p)
  282 {
  283         struct usb_frag_dma *f;
  284         int s;
  285 
  286         if (p->block->flags & USB_DMA_FULLBLOCK) {
  287                 DPRINTFN(1, ("usb_freemem: large free\n"));
  288                 usb_block_freemem(p->block);
  289                 return;
  290         }
  291         //usb_syncmem(p, 0, USB_MEM_SMALL, BUS_DMASYNC_POSTREAD);
  292         f = KERNADDR(p, 0);
  293 #ifdef USB_FRAG_DMA_WORKAROUND
  294         f = (void *)((uintptr_t)f - USB_MEM_SMALL);
  295 #endif
  296         f->block = p->block;
  297         f->offs = p->offs;
  298 #ifdef USB_FRAG_DMA_WORKAROUND
  299         f->offs -= USB_MEM_SMALL;
  300 #endif
  301         s = splusb();
  302         LIST_INSERT_HEAD(&usb_frag_freelist, f, next);
  303         splx(s);
  304         DPRINTFN(5, ("usb_freemem: frag=%p\n", f));
  305 }
  306 
  307 void
  308 usb_syncmem(usb_dma_t *p, bus_addr_t offset, bus_size_t len, int ops)
  309 {
  310         bus_dmamap_sync(p->block->tag, p->block->map, p->offs + offset,
  311             len, ops);
  312 }
  313 
  314 
  315 #ifdef __NetBSD__
  316 usbd_status
  317 usb_reserve_allocm(struct usb_dma_reserve *rs, usb_dma_t *dma, u_int32_t size)
  318 {
  319         int error;
  320         u_long start;
  321         bus_addr_t baddr;
  322 
  323         if (rs->vaddr == 0 || size > USB_MEM_RESERVE)
  324                 return USBD_NOMEM;
  325 
  326         dma->block = malloc(sizeof *dma->block, M_USB, M_ZERO | M_NOWAIT);
  327         if (dma->block == NULL)
  328                 return USBD_NOMEM;
  329 
  330         error = extent_alloc(rs->extent, size, PAGE_SIZE, 0,
  331             EX_NOWAIT, &start);
  332 
  333         if (error != 0) {
  334                 aprint_error_dev(rs->dv,
  335                     "usb_reserve_allocm of size %u failed (error %d)\n",
  336                     size, error);
  337                 return USBD_NOMEM;
  338         }
  339 
  340         baddr = start;
  341         dma->offs = baddr - rs->paddr;
  342         dma->block->flags = USB_DMA_RESERVE;
  343         dma->block->align = PAGE_SIZE;
  344         dma->block->size = size;
  345         dma->block->nsegs = 1;
  346         /* XXX segs appears to be unused */
  347         dma->block->segs[0] = rs->map->dm_segs[0];
  348         dma->block->map = rs->map;
  349         dma->block->kaddr = rs->vaddr;
  350         dma->block->tag = rs->dtag;
  351 
  352         return USBD_NORMAL_COMPLETION;
  353 }
  354 
  355 void
  356 usb_reserve_freem(struct usb_dma_reserve *rs, usb_dma_t *dma)
  357 {
  358         int error;
  359 
  360         error = extent_free(rs->extent,
  361             (u_long)(rs->paddr + dma->offs), dma->block->size, 0);
  362         free(dma->block, M_USB);
  363 }
  364 
  365 int
  366 usb_setup_reserve(device_t dv, struct usb_dma_reserve *rs, bus_dma_tag_t dtag,
  367                   size_t size)
  368 {
  369         int error, nseg;
  370         bus_dma_segment_t seg;
  371 
  372         rs->dtag = dtag;
  373         rs->size = size;
  374         rs->dv = dv;
  375 
  376         error = bus_dmamem_alloc(dtag, USB_MEM_RESERVE, PAGE_SIZE, 0,
  377             &seg, 1, &nseg, BUS_DMA_NOWAIT);
  378         if (error != 0)
  379                 return error;
  380 
  381         error = bus_dmamem_map(dtag, &seg, nseg, USB_MEM_RESERVE,
  382             &rs->vaddr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
  383         if (error != 0)
  384                 goto freeit;
  385 
  386         error = bus_dmamap_create(dtag, USB_MEM_RESERVE, 1,
  387             USB_MEM_RESERVE, 0, BUS_DMA_NOWAIT, &rs->map);
  388         if (error != 0)
  389                 goto unmap;
  390 
  391         error = bus_dmamap_load(dtag, rs->map, rs->vaddr, USB_MEM_RESERVE,
  392             NULL, BUS_DMA_NOWAIT);
  393         if (error != 0)
  394                 goto destroy;
  395 
  396         rs->paddr = rs->map->dm_segs[0].ds_addr;
  397         rs->extent = extent_create(device_xname(dv), (u_long)rs->paddr,
  398             (u_long)(rs->paddr + USB_MEM_RESERVE - 1),
  399             M_USB, 0, 0, 0);
  400         if (rs->extent == NULL) {
  401                 rs->vaddr = 0;
  402                 return ENOMEM;
  403         }
  404 
  405         return 0;
  406 
  407  destroy:
  408         bus_dmamap_destroy(dtag, rs->map);
  409  unmap:
  410         bus_dmamem_unmap(dtag, rs->vaddr, size);
  411  freeit:
  412         bus_dmamem_free(dtag, &seg, nseg);
  413 
  414         rs->vaddr = 0;
  415 
  416         return error;
  417 }
  418 #endif

Cache object: dc409f9981a5605a21b9e1dd2fc13791


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