/*- * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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; }