Date: Thu, 29 Jan 2015 20:35:09 +0000 From: =?utf-8?Q?SalvageDrive.com?= <info@salvagedrive.com> To: =?utf-8?Q??= <arch@freebsd.org> Subject: =?utf-8?Q?Cars=20Cars=20Cars?= Message-ID: <38668d8a390eaafe346aac8d5c538f13530.20150129203500@mail54.atl51.rsgsv.net>
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(http://salvagedrive.us8.list-manage.com/about?u=3D386= 68d8a390eaafe346aac8d5&id=3Db173b821c7&e=3Dc538f13530&c=3Db20b661509) un= subscribe from this list (http://salvagedrive.us8.list-manage.com/unsubscr= ibe?u=3D38668d8a390eaafe346aac8d5&id=3Db173b821c7&e=3Dc538f13530&c=3Db20b661= 509) update subscription preferences (http://salvagedrive.us8.list-man= age.com/profile?u=3D38668d8a390eaafe346aac8d5&id=3Db173b821c7&e=3Dc538f13530= ) Salvage Drive=2C Inc. =C2=B7 217 Broadway =C2=B7 Suite 505 =C2=B7 New York= =2C NY 10007 =C2=B7 USA From owner-freebsd-arch@FreeBSD.ORG Thu Jan 29 21:04:23 2015 Return-Path: <owner-freebsd-arch@FreeBSD.ORG> Delivered-To: freebsd-arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 2480B514 for <freebsd-arch@freebsd.org>; Thu, 29 Jan 2015 21:04:23 +0000 (UTC) Received: from bigwig.baldwin.cx (bigwig.baldwin.cx [IPv6:2001:470:1f11:75::1]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id D69869C8 for <freebsd-arch@freebsd.org>; Thu, 29 Jan 2015 21:04:22 +0000 (UTC) Received: from ralph.baldwin.cx (pool-173-70-85-31.nwrknj.fios.verizon.net [173.70.85.31]) by bigwig.baldwin.cx (Postfix) with ESMTPSA id AD060B96C for <freebsd-arch@freebsd.org>; Thu, 29 Jan 2015 16:04:21 -0500 (EST) From: John Baldwin <jhb@freebsd.org> To: 'freebsd-arch' <freebsd-arch@freebsd.org> Subject: Wrapper API for static bus_dma allocations Date: Thu, 29 Jan 2015 15:37:19 -0500 Message-ID: <2800970.jY4xzTy9Hz@ralph.baldwin.cx> User-Agent: KMail/4.14.2 (FreeBSD/10.1-STABLE; KDE/4.14.2; amd64; ; ) MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.7 (bigwig.baldwin.cx); Thu, 29 Jan 2015 16:04:21 -0500 (EST) X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-arch>, <mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch/>; List-Post: <mailto:freebsd-arch@freebsd.org> List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>, <mailto:freebsd-arch-request@freebsd.org?subject=subscribe> X-List-Received-Date: Thu, 29 Jan 2015 21:04:23 -0000 The bus_dma API to allocate a chunk of static DMA'able memory (e.g. for descriptor rings) can be a bit obtuse to use in that it require a bit of boilerplate to create a tag, allocate memory for the tag, then load it to get the bus address. Similarly, freeing it also requires several steps. In addition, some of the steps are a bit subtle (e.g. the need to check for an error in the bus_dma callback instead of from bus_dmamap_load()) and not all drivers get those correct. To try to make this simpler I've written a little wrapper API that tries to provide a single call to allocate a buffer and a single call to free a buffer. Each buffer is described by a structure defined by the API, and if the call to allocate a buffer succeeds, the structure contains both a pointer to the buffer in the kernel's address space as well as a bus address of the buffer. In the interests of simplicity, this API does not allow the buffer to be quite as fully configured as the underlying bus_dma API, instead it aims to handle the most common cases that are used in most drivers. As such, it assumes that the buffer must be one contiguous range of DMA address space, and the only parameters that can be specified are the parent tag, the alignment of the buffer, the lowaddr parameter, the size of the buffer to allocate, and the flags parameter that is normally passed to bus_dmamem_alloc(). I believe that this should be sufficient to cover the vast majority of the drivers in our tree. I've included below a patch that contains the wrapper API along with a sample conversion of the ndis driver (chosen at random). If folks like this idea I will update the patch to include manpage changes as well. --- //depot/vendor/freebsd/src/sys/compat/ndis/subr_ndis.c +++ //depot/user/jhb/cleanup/sys/compat/ndis/subr_ndis.c @@ -186,7 +186,6 @@ static ndis_status NdisMAllocateMapRegisters(ndis_handle, uint32_t, uint8_t, uint32_t, uint32_t); static void NdisMFreeMapRegisters(ndis_handle); -static void ndis_mapshared_cb(void *, bus_dma_segment_t *, int, int); static void NdisMAllocateSharedMemory(ndis_handle, uint32_t, uint8_t, void **, ndis_physaddr *); static void ndis_asyncmem_complete(device_object *, void *); @@ -1387,23 +1386,6 @@ bus_dma_tag_destroy(sc->ndis_mtag); } -static void -ndis_mapshared_cb(arg, segs, nseg, error) - void *arg; - bus_dma_segment_t *segs; - int nseg; - int error; -{ - ndis_physaddr *p; - - if (error || nseg > 1) - return; - - p = arg; - - p->np_quad = segs[0].ds_addr; -} - /* * This maps to bus_dmamem_alloc(). */ @@ -1443,35 +1425,17 @@ * than 1GB of physical memory. */ - error = bus_dma_tag_create(sc->ndis_parent_tag, 64, - 0, NDIS_BUS_SPACE_SHARED_MAXADDR, BUS_SPACE_MAXADDR, NULL, - NULL, len, 1, len, BUS_DMA_ALLOCNOW, NULL, NULL, - &sh->ndis_stag); + error = bus_dma_mem_create(&sh->ndis_mem, sc->ndis_parent_tag, 64, + NDIS_BUS_SPACE_SHARED_MAXADDR, len, BUS_DMA_NOWAIT | BUS_DMA_ZERO); if (error) { free(sh, M_DEVBUF); return; } - error = bus_dmamem_alloc(sh->ndis_stag, vaddr, - BUS_DMA_NOWAIT | BUS_DMA_ZERO, &sh->ndis_smap); - - if (error) { - bus_dma_tag_destroy(sh->ndis_stag); - free(sh, M_DEVBUF); - return; - } + *vaddr = sh->ndis_mem.dma_vaddr; + paddr->np_quad = sh->ndis_mem.dma_baddr; - error = bus_dmamap_load(sh->ndis_stag, sh->ndis_smap, *vaddr, - len, ndis_mapshared_cb, (void *)paddr, BUS_DMA_NOWAIT); - - if (error) { - bus_dmamem_free(sh->ndis_stag, *vaddr, sh->ndis_smap); - bus_dma_tag_destroy(sh->ndis_stag); - free(sh, M_DEVBUF); - return; - } - /* * Save the physical address along with the source address. * The AirGo MIMO driver will call NdisMFreeSharedMemory() @@ -1482,8 +1446,6 @@ */ NDIS_LOCK(sc); - sh->ndis_paddr.np_quad = paddr->np_quad; - sh->ndis_saddr = *vaddr; InsertHeadList((&sc->ndis_shlist), (&sh->ndis_list)); NDIS_UNLOCK(sc); } @@ -1581,13 +1543,13 @@ l = sc->ndis_shlist.nle_flink; while (l != &sc->ndis_shlist) { sh = CONTAINING_RECORD(l, struct ndis_shmem, ndis_list); - if (sh->ndis_saddr == vaddr) + if (sh->ndis_mem.dma_vaddr == vaddr) break; /* * Check the physaddr too, just in case the driver lied * about the virtual address. */ - if (sh->ndis_paddr.np_quad == paddr.np_quad) + if (sh->ndis_mem.dma_baddr == paddr.np_quad) break; l = l->nle_flink; } @@ -1604,9 +1566,7 @@ NDIS_UNLOCK(sc); - bus_dmamap_unload(sh->ndis_stag, sh->ndis_smap); - bus_dmamem_free(sh->ndis_stag, sh->ndis_saddr, sh->ndis_smap); - bus_dma_tag_destroy(sh->ndis_stag); + bus_dma_mem_free(&sh->ndis_mem); free(sh, M_DEVBUF); } --- //depot/vendor/freebsd/src/sys/dev/if_ndis/if_ndisvar.h +++ //depot/user/jhb/cleanup/sys/dev/if_ndis/if_ndisvar.h @@ -66,10 +66,7 @@ struct ndis_shmem { list_entry ndis_list; - bus_dma_tag_t ndis_stag; - bus_dmamap_t ndis_smap; - void *ndis_saddr; - ndis_physaddr ndis_paddr; + struct bus_dmamem ndis_mem; }; struct ndis_cfglist { --- //depot/vendor/freebsd/src/sys/kern/subr_bus_dma.c +++ //depot/user/jhb/cleanup/sys/kern/subr_bus_dma.c @@ -540,3 +540,66 @@ return (0); } + +struct bus_dma_mem_cb_data { + struct bus_dmamem *mem; + int error; +}; + +static void +bus_dma_mem_cb(void *arg, bus_dma_segment_t *segs, int nseg, int error) +{ + struct bus_dma_mem_cb_data *d; + + d = arg; + d->error = error; + if (error) + return; + d->mem->dma_baddr = segs[0].ds_addr; +} + +int +bus_dma_mem_create(struct bus_dmamem *mem, bus_dma_tag_t parent, + bus_size_t alignment, bus_addr_t lowaddr, bus_size_t len, int flags) +{ + struct bus_dma_mem_cb_data d; + int error; + + bzero(mem, sizeof(*mem)); + error = bus_dma_tag_create(parent, alignment, 0, lowaddr, + BUS_SPACE_MAXADDR, NULL, NULL, len, 1, len, 0, NULL, NULL, + &mem->dma_tag); + if (error) { + bus_dma_mem_free(mem); + return (error); + } + error = bus_dmamem_alloc(mem->dma_tag, &mem->dma_vaddr, flags, + &mem->dma_map); + if (error) { + bus_dma_mem_free(mem); + return (error); + } + d.mem = mem; + error = bus_dmamap_load(mem->dma_tag, mem->dma_map, mem->dma_vaddr, len, + bus_dma_mem_cb, &d, BUS_DMA_NOWAIT); + if (error == 0) + error = d.error; + if (error) { + bus_dma_mem_free(mem); + return (error); + } + return (0); +} + +void +bus_dma_mem_free(struct bus_dmamem *mem) +{ + + if (mem->dma_baddr != 0) + bus_dmamap_unload(mem->dma_tag, mem->dma_map); + if (mem->dma_vaddr != NULL) + bus_dmamem_free(mem->dma_tag, mem->dma_vaddr, mem->dma_map); + if (mem->dma_tag != NULL) + bus_dma_tag_destroy(mem->dma_tag); + bzero(mem, sizeof(*mem)); +} --- //depot/vendor/freebsd/src/sys/sys/bus_dma.h +++ //depot/user/jhb/cleanup/sys/sys/bus_dma.h @@ -337,4 +337,29 @@ #endif /* __sparc64__ */ +/* + * A wrapper API to simplify management of static mappings. + */ + +struct bus_dmamem { + bus_dma_tag_t dma_tag; + bus_dmamap_t dma_map; + void *dma_vaddr; + bus_addr_t dma_baddr; +}; + +/* + * Allocate a mapping. On success, zero is returned and the 'dma_vaddr' + * and 'dma_baddr' fields are populated with the virtual and bus addresses, + * respectively, of the mapping. + */ +int bus_dma_mem_create(struct bus_dmamem *mem, bus_dma_tag_t parent, + bus_size_t alignment, bus_addr_t lowaddr, + bus_size_t len, int flags); + +/* + * Release a mapping created by bus_dma_mem_create(). + */ +void bus_dma_mem_free(struct bus_dmamem *mem); + #endif /* _BUS_DMA_H_ */ -- John Baldwin
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