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