+++ /dev/null
-/* 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;
-}
Code Review / deb_dpdk.git / blobdiff