diff options
Diffstat (limited to 'lib/librte_eal/bsdapp/contigmem/contigmem.c')
| -rw-r--r-- | lib/librte_eal/bsdapp/contigmem/contigmem.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/lib/librte_eal/bsdapp/contigmem/contigmem.c b/lib/librte_eal/bsdapp/contigmem/contigmem.c new file mode 100644 index 00000000..c6ca3b9c --- /dev/null +++ b/lib/librte_eal/bsdapp/contigmem/contigmem.c @@ -0,0 +1,232 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/bio.h> +#include <sys/bus.h> +#include <sys/conf.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/module.h> +#include <sys/proc.h> +#include <sys/rwlock.h> +#include <sys/systm.h> +#include <sys/sysctl.h> + +#include <machine/bus.h> + +#include <vm/vm.h> +#include <vm/pmap.h> +#include <vm/vm_object.h> +#include <vm/vm_page.h> +#include <vm/vm_pager.h> + +static int contigmem_load(void); +static int contigmem_unload(void); +static int contigmem_physaddr(SYSCTL_HANDLER_ARGS); + +static d_mmap_t contigmem_mmap; +static d_mmap_single_t contigmem_mmap_single; +static d_open_t contigmem_open; + +static int contigmem_num_buffers = RTE_CONTIGMEM_DEFAULT_NUM_BUFS; +static int64_t contigmem_buffer_size = RTE_CONTIGMEM_DEFAULT_BUF_SIZE; + +static eventhandler_tag contigmem_eh_tag; +static void *contigmem_buffers[RTE_CONTIGMEM_MAX_NUM_BUFS]; +static struct cdev *contigmem_cdev = NULL; + +TUNABLE_INT("hw.contigmem.num_buffers", &contigmem_num_buffers); +TUNABLE_QUAD("hw.contigmem.buffer_size", &contigmem_buffer_size); + +static SYSCTL_NODE(_hw, OID_AUTO, contigmem, CTLFLAG_RD, 0, "contigmem"); + +SYSCTL_INT(_hw_contigmem, OID_AUTO, num_buffers, CTLFLAG_RD, + &contigmem_num_buffers, 0, "Number of contigmem buffers allocated"); +SYSCTL_QUAD(_hw_contigmem, OID_AUTO, buffer_size, CTLFLAG_RD, + &contigmem_buffer_size, 0, "Size of each contiguous buffer"); + +static SYSCTL_NODE(_hw_contigmem, OID_AUTO, physaddr, CTLFLAG_RD, 0, + "physaddr"); + +MALLOC_DEFINE(M_CONTIGMEM, "contigmem", "contigmem(4) allocations"); + +static int contigmem_modevent(module_t mod, int type, void *arg) +{ + int error = 0; + + switch (type) { + case MOD_LOAD: + error = contigmem_load(); + break; + case MOD_UNLOAD: + error = contigmem_unload(); + break; + default: + break; + } + + return error; +} + +moduledata_t contigmem_mod = { + "contigmem", + (modeventhand_t)contigmem_modevent, + 0 +}; + +DECLARE_MODULE(contigmem, contigmem_mod, SI_SUB_DRIVERS, SI_ORDER_ANY); +MODULE_VERSION(contigmem, 1); + +static struct cdevsw contigmem_ops = { + .d_name = "contigmem", + .d_version = D_VERSION, + .d_mmap = contigmem_mmap, + .d_mmap_single = contigmem_mmap_single, + .d_open = contigmem_open, +}; + +static int +contigmem_load() +{ + char index_string[8], description[32]; + int i; + + if (contigmem_num_buffers > RTE_CONTIGMEM_MAX_NUM_BUFS) { + printf("%d buffers requested is greater than %d allowed\n", + contigmem_num_buffers, RTE_CONTIGMEM_MAX_NUM_BUFS); + return EINVAL; + } + + if (contigmem_buffer_size < PAGE_SIZE || + (contigmem_buffer_size & (contigmem_buffer_size - 1)) != 0) { + printf("buffer size 0x%lx is not greater than PAGE_SIZE and " + "power of two\n", contigmem_buffer_size); + return EINVAL; + } + + for (i = 0; i < contigmem_num_buffers; i++) { + contigmem_buffers[i] = + contigmalloc(contigmem_buffer_size, M_CONTIGMEM, M_ZERO, 0, + BUS_SPACE_MAXADDR, contigmem_buffer_size, 0); + + if (contigmem_buffers[i] == NULL) { + printf("contigmalloc failed for buffer %d\n", i); + return ENOMEM; + } + + printf("%2u: virt=%p phys=%p\n", i, contigmem_buffers[i], + (void *)pmap_kextract((vm_offset_t)contigmem_buffers[i])); + + snprintf(index_string, sizeof(index_string), "%d", i); + snprintf(description, sizeof(description), + "phys addr for buffer %d", i); + SYSCTL_ADD_PROC(NULL, + &SYSCTL_NODE_CHILDREN(_hw_contigmem, physaddr), OID_AUTO, + index_string, CTLTYPE_U64 | CTLFLAG_RD, + (void *)(uintptr_t)i, 0, contigmem_physaddr, "LU", + description); + } + + contigmem_cdev = make_dev_credf(0, &contigmem_ops, 0, NULL, UID_ROOT, + GID_WHEEL, 0600, "contigmem"); + + return 0; +} + +static int +contigmem_unload() +{ + int i; + + if (contigmem_cdev != NULL) + destroy_dev(contigmem_cdev); + + if (contigmem_eh_tag != NULL) + EVENTHANDLER_DEREGISTER(process_exit, contigmem_eh_tag); + + for (i = 0; i < RTE_CONTIGMEM_MAX_NUM_BUFS; i++) + if (contigmem_buffers[i] != NULL) + contigfree(contigmem_buffers[i], contigmem_buffer_size, + M_CONTIGMEM); + + return 0; +} + +static int +contigmem_physaddr(SYSCTL_HANDLER_ARGS) +{ + uint64_t physaddr; + int index = (int)(uintptr_t)arg1; + + physaddr = (uint64_t)vtophys(contigmem_buffers[index]); + return sysctl_handle_64(oidp, &physaddr, 0, req); +} + +static int +contigmem_open(struct cdev *cdev, int fflags, int devtype, + struct thread *td) +{ + return 0; +} + +static int +contigmem_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr, + int prot, vm_memattr_t *memattr) +{ + + *paddr = offset; + return 0; +} + +static int +contigmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t size, + struct vm_object **obj, int nprot) +{ + /* + * The buffer index is encoded in the offset. Divide the offset by + * PAGE_SIZE to get the index of the buffer requested by the user + * app. + */ + if ((*offset/PAGE_SIZE) >= contigmem_num_buffers) + return EINVAL; + + *offset = (vm_ooffset_t)vtophys(contigmem_buffers[*offset/PAGE_SIZE]); + *obj = vm_pager_allocate(OBJT_DEVICE, cdev, size, nprot, *offset, + curthread->td_ucred); + + return 0; +} |