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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#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 <sys/vmmeter.h>
#include <machine/bus.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_param.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <vm/vm_phys.h>
struct contigmem_buffer {
void *addr;
int refcnt;
struct mtx mtx;
};
struct contigmem_vm_handle {
int buffer_index;
};
static int contigmem_load(void);
static int contigmem_unload(void);
static int contigmem_physaddr(SYSCTL_HANDLER_ARGS);
static d_mmap_single_t contigmem_mmap_single;
static d_open_t contigmem_open;
static d_close_t contigmem_close;
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 struct contigmem_buffer contigmem_buffers[RTE_CONTIGMEM_MAX_NUM_BUFS];
static struct cdev *contigmem_cdev = NULL;
static int contigmem_refcnt;
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");
SYSCTL_INT(_hw_contigmem, OID_AUTO, num_references, CTLFLAG_RD,
&contigmem_refcnt, 0, "Number of references to contigmem");
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_flags = D_TRACKCLOSE,
.d_mmap_single = contigmem_mmap_single,
.d_open = contigmem_open,
.d_close = contigmem_close,
};
static int
contigmem_load()
{
char index_string[8], description[32];
int i, error = 0;
void *addr;
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);
error = EINVAL;
goto error;
}
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);
error = EINVAL;
goto error;
}
for (i = 0; i < contigmem_num_buffers; i++) {
addr = contigmalloc(contigmem_buffer_size, M_CONTIGMEM, M_ZERO,
0, BUS_SPACE_MAXADDR, contigmem_buffer_size, 0);
if (addr == NULL) {
printf("contigmalloc failed for buffer %d\n", i);
error = ENOMEM;
goto error;
}
printf("%2u: virt=%p phys=%p\n", i, addr,
(void *)pmap_kextract((vm_offset_t)addr));
mtx_init(&contigmem_buffers[i].mtx, "contigmem", NULL, MTX_DEF);
contigmem_buffers[i].addr = addr;
contigmem_buffers[i].refcnt = 0;
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;
error:
for (i = 0; i < contigmem_num_buffers; i++) {
if (contigmem_buffers[i].addr != NULL)
contigfree(contigmem_buffers[i].addr,
contigmem_buffer_size, M_CONTIGMEM);
if (mtx_initialized(&contigmem_buffers[i].mtx))
mtx_destroy(&contigmem_buffers[i].mtx);
}
return error;
}
static int
contigmem_unload()
{
int i;
if (contigmem_refcnt > 0)
return EBUSY;
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].addr != NULL)
contigfree(contigmem_buffers[i].addr,
contigmem_buffer_size, M_CONTIGMEM);
if (mtx_initialized(&contigmem_buffers[i].mtx))
mtx_destroy(&contigmem_buffers[i].mtx);
}
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].addr);
return sysctl_handle_64(oidp, &physaddr, 0, req);
}
static int
contigmem_open(struct cdev *cdev, int fflags, int devtype,
struct thread *td)
{
atomic_add_int(&contigmem_refcnt, 1);
return 0;
}
static int
contigmem_close(struct cdev *cdev, int fflags, int devtype,
struct thread *td)
{
atomic_subtract_int(&contigmem_refcnt, 1);
return 0;
}
static int
contigmem_cdev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
vm_ooffset_t foff, struct ucred *cred, u_short *color)
{
struct contigmem_vm_handle *vmh = handle;
struct contigmem_buffer *buf;
buf = &contigmem_buffers[vmh->buffer_index];
atomic_add_int(&contigmem_refcnt, 1);
mtx_lock(&buf->mtx);
if (buf->refcnt == 0)
memset(buf->addr, 0, contigmem_buffer_size);
buf->refcnt++;
mtx_unlock(&buf->mtx);
return 0;
}
static void
contigmem_cdev_pager_dtor(void *handle)
{
struct contigmem_vm_handle *vmh = handle;
struct contigmem_buffer *buf;
buf = &contigmem_buffers[vmh->buffer_index];
mtx_lock(&buf->mtx);
buf->refcnt--;
mtx_unlock(&buf->mtx);
free(vmh, M_CONTIGMEM);
atomic_subtract_int(&contigmem_refcnt, 1);
}
static int
contigmem_cdev_pager_fault(vm_object_t object, vm_ooffset_t offset, int prot,
vm_page_t *mres)
{
vm_paddr_t paddr;
vm_page_t m_paddr, page;
vm_memattr_t memattr, memattr1;
memattr = object->memattr;
VM_OBJECT_WUNLOCK(object);
paddr = offset;
m_paddr = vm_phys_paddr_to_vm_page(paddr);
if (m_paddr != NULL) {
memattr1 = pmap_page_get_memattr(m_paddr);
if (memattr1 != memattr)
memattr = memattr1;
}
if (((*mres)->flags & PG_FICTITIOUS) != 0) {
/*
* If the passed in result page is a fake page, update it with
* the new physical address.
*/
page = *mres;
VM_OBJECT_WLOCK(object);
vm_page_updatefake(page, paddr, memattr);
} else {
vm_page_t mret;
/*
* Replace the passed in reqpage page with our own fake page and
* free up the original page.
*/
page = vm_page_getfake(paddr, memattr);
VM_OBJECT_WLOCK(object);
mret = vm_page_replace(page, object, (*mres)->pindex);
KASSERT(mret == *mres,
("invalid page replacement, old=%p, ret=%p", *mres, mret));
vm_page_lock(mret);
vm_page_free(mret);
vm_page_unlock(mret);
*mres = page;
}
page->valid = VM_PAGE_BITS_ALL;
return VM_PAGER_OK;
}
static struct cdev_pager_ops contigmem_cdev_pager_ops = {
.cdev_pg_ctor = contigmem_cdev_pager_ctor,
.cdev_pg_dtor = contigmem_cdev_pager_dtor,
.cdev_pg_fault = contigmem_cdev_pager_fault,
};
static int
contigmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t size,
struct vm_object **obj, int nprot)
{
struct contigmem_vm_handle *vmh;
uint64_t buffer_index;
/*
* 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.
*/
buffer_index = *offset / PAGE_SIZE;
if (buffer_index >= contigmem_num_buffers)
return EINVAL;
if (size > contigmem_buffer_size)
return EINVAL;
vmh = malloc(sizeof(*vmh), M_CONTIGMEM, M_NOWAIT | M_ZERO);
if (vmh == NULL)
return ENOMEM;
vmh->buffer_index = buffer_index;
*offset = (vm_ooffset_t)vtophys(contigmem_buffers[buffer_index].addr);
*obj = cdev_pager_allocate(vmh, OBJT_DEVICE, &contigmem_cdev_pager_ops,
size, nprot, *offset, curthread->td_ucred);
return 0;
}
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