4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.h>
43 #include <sys/module.h>
45 #include <sys/rwlock.h>
46 #include <sys/systm.h>
47 #include <sys/sysctl.h>
49 #include <machine/bus.h>
53 #include <vm/vm_object.h>
54 #include <vm/vm_page.h>
55 #include <vm/vm_pager.h>
57 static int contigmem_load(void);
58 static int contigmem_unload(void);
59 static int contigmem_physaddr(SYSCTL_HANDLER_ARGS);
61 static d_mmap_t contigmem_mmap;
62 static d_mmap_single_t contigmem_mmap_single;
63 static d_open_t contigmem_open;
65 static int contigmem_num_buffers = RTE_CONTIGMEM_DEFAULT_NUM_BUFS;
66 static int64_t contigmem_buffer_size = RTE_CONTIGMEM_DEFAULT_BUF_SIZE;
68 static eventhandler_tag contigmem_eh_tag;
69 static void *contigmem_buffers[RTE_CONTIGMEM_MAX_NUM_BUFS];
70 static struct cdev *contigmem_cdev = NULL;
72 TUNABLE_INT("hw.contigmem.num_buffers", &contigmem_num_buffers);
73 TUNABLE_QUAD("hw.contigmem.buffer_size", &contigmem_buffer_size);
75 static SYSCTL_NODE(_hw, OID_AUTO, contigmem, CTLFLAG_RD, 0, "contigmem");
77 SYSCTL_INT(_hw_contigmem, OID_AUTO, num_buffers, CTLFLAG_RD,
78 &contigmem_num_buffers, 0, "Number of contigmem buffers allocated");
79 SYSCTL_QUAD(_hw_contigmem, OID_AUTO, buffer_size, CTLFLAG_RD,
80 &contigmem_buffer_size, 0, "Size of each contiguous buffer");
82 static SYSCTL_NODE(_hw_contigmem, OID_AUTO, physaddr, CTLFLAG_RD, 0,
85 MALLOC_DEFINE(M_CONTIGMEM, "contigmem", "contigmem(4) allocations");
87 static int contigmem_modevent(module_t mod, int type, void *arg)
93 error = contigmem_load();
96 error = contigmem_unload();
105 moduledata_t contigmem_mod = {
107 (modeventhand_t)contigmem_modevent,
111 DECLARE_MODULE(contigmem, contigmem_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
112 MODULE_VERSION(contigmem, 1);
114 static struct cdevsw contigmem_ops = {
115 .d_name = "contigmem",
116 .d_version = D_VERSION,
117 .d_mmap = contigmem_mmap,
118 .d_mmap_single = contigmem_mmap_single,
119 .d_open = contigmem_open,
125 char index_string[8], description[32];
128 if (contigmem_num_buffers > RTE_CONTIGMEM_MAX_NUM_BUFS) {
129 printf("%d buffers requested is greater than %d allowed\n",
130 contigmem_num_buffers, RTE_CONTIGMEM_MAX_NUM_BUFS);
134 if (contigmem_buffer_size < PAGE_SIZE ||
135 (contigmem_buffer_size & (contigmem_buffer_size - 1)) != 0) {
136 printf("buffer size 0x%lx is not greater than PAGE_SIZE and "
137 "power of two\n", contigmem_buffer_size);
141 for (i = 0; i < contigmem_num_buffers; i++) {
142 contigmem_buffers[i] =
143 contigmalloc(contigmem_buffer_size, M_CONTIGMEM, M_ZERO, 0,
144 BUS_SPACE_MAXADDR, contigmem_buffer_size, 0);
146 if (contigmem_buffers[i] == NULL) {
147 printf("contigmalloc failed for buffer %d\n", i);
151 printf("%2u: virt=%p phys=%p\n", i, contigmem_buffers[i],
152 (void *)pmap_kextract((vm_offset_t)contigmem_buffers[i]));
154 snprintf(index_string, sizeof(index_string), "%d", i);
155 snprintf(description, sizeof(description),
156 "phys addr for buffer %d", i);
157 SYSCTL_ADD_PROC(NULL,
158 &SYSCTL_NODE_CHILDREN(_hw_contigmem, physaddr), OID_AUTO,
159 index_string, CTLTYPE_U64 | CTLFLAG_RD,
160 (void *)(uintptr_t)i, 0, contigmem_physaddr, "LU",
164 contigmem_cdev = make_dev_credf(0, &contigmem_ops, 0, NULL, UID_ROOT,
165 GID_WHEEL, 0600, "contigmem");
175 if (contigmem_cdev != NULL)
176 destroy_dev(contigmem_cdev);
178 if (contigmem_eh_tag != NULL)
179 EVENTHANDLER_DEREGISTER(process_exit, contigmem_eh_tag);
181 for (i = 0; i < RTE_CONTIGMEM_MAX_NUM_BUFS; i++)
182 if (contigmem_buffers[i] != NULL)
183 contigfree(contigmem_buffers[i], contigmem_buffer_size,
190 contigmem_physaddr(SYSCTL_HANDLER_ARGS)
193 int index = (int)(uintptr_t)arg1;
195 physaddr = (uint64_t)vtophys(contigmem_buffers[index]);
196 return sysctl_handle_64(oidp, &physaddr, 0, req);
200 contigmem_open(struct cdev *cdev, int fflags, int devtype,
207 contigmem_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
208 int prot, vm_memattr_t *memattr)
216 contigmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t size,
217 struct vm_object **obj, int nprot)
220 * The buffer index is encoded in the offset. Divide the offset by
221 * PAGE_SIZE to get the index of the buffer requested by the user
224 if ((*offset/PAGE_SIZE) >= contigmem_num_buffers)
227 *offset = (vm_ooffset_t)vtophys(contigmem_buffers[*offset/PAGE_SIZE]);
228 *obj = vm_pager_allocate(OBJT_DEVICE, cdev, size, nprot, *offset,
229 curthread->td_ucred);