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#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <arpa/inet.h>
#include <errno.h>
#include <assert.h>
#include "pcilib.h"
#include "pci.h"
#include "kmem.h"
#include "error.h"
pcilib_kmem_handle_t *pcilib_alloc_kernel_memory(pcilib_t *ctx, pcilib_kmem_type_t type, size_t nmemb, size_t size, size_t alignment, pcilib_kmem_use_t use, pcilib_kmem_flags_t flags) {
int ret;
int i;
void *addr;
kmem_handle_t kh = {0};
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)malloc(sizeof(pcilib_kmem_list_t) + nmemb * sizeof(pcilib_kmem_addr_t));
if (!kbuf) {
pcilib_error("Memory allocation has failed");
return NULL;
}
memset(kbuf, 0, sizeof(pcilib_kmem_list_t) + nmemb * sizeof(pcilib_kmem_addr_t));
ret = ioctl( ctx->handle, PCIDRIVER_IOC_MMAP_MODE, PCIDRIVER_MMAP_KMEM );
if (ret) {
pcilib_error("PCIDRIVER_IOC_MMAP_MODE ioctl have failed");
return NULL;
}
kh.type = type;
kh.size = size;
kh.align = alignment;
kh.use = use;
if (type != PCILIB_KMEM_TYPE_PAGE) {
kh.size += alignment;
}
for ( i = 0; i < nmemb; i++) {
ret = ioctl(ctx->handle, PCIDRIVER_IOC_KMEM_ALLOC, &kh);
if (ret) {
kbuf->buf.n_blocks = i;
pcilib_free_kernel_memory(ctx, kbuf);
pcilib_error("PCIDRIVER_IOC_KMEM_ALLOC ioctl have failed");
return NULL;
}
kbuf->buf.blocks[i].handle_id = kh.handle_id;
kbuf->buf.blocks[i].pa = kh.pa;
kbuf->buf.blocks[i].size = kh.size;
if ((alignment)&&(type != PCILIB_KMEM_TYPE_PAGE)) {
if (kh.pa % alignment) kbuf->buf.blocks[i].alignment_offset = alignment - kh.pa % alignment;
kbuf->buf.blocks[i].size -= alignment;
}
addr = mmap( 0, kh.size + kbuf->buf.blocks[i].alignment_offset, PROT_WRITE | PROT_READ, MAP_SHARED, ctx->handle, 0 );
if ((!addr)||(addr == MAP_FAILED)) {
kbuf->buf.n_blocks = i + 1;
pcilib_free_kernel_memory(ctx, kbuf);
pcilib_error("Failed to mmap allocated kernel memory");
return NULL;
}
kbuf->buf.blocks[i].ua = addr;
kbuf->buf.blocks[i].mmap_offset = kh.pa & ctx->page_mask;
}
if (nmemb == 1) {
memcpy(&kbuf->buf.addr, &kbuf->buf.blocks[0], sizeof(pcilib_kmem_addr_t));
}
kbuf->buf.n_blocks = nmemb;
kbuf->prev = NULL;
kbuf->next = ctx->kmem_list;
if (ctx->kmem_list) ctx->kmem_list->prev = kbuf;
ctx->kmem_list = kbuf;
return (pcilib_kmem_handle_t*)kbuf;
}
void pcilib_free_kernel_memory(pcilib_t *ctx, pcilib_kmem_handle_t *k) {
int ret, err = 0;
int i;
kmem_handle_t kh = {0};
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)k;
// if linked in to the list
if (kbuf->next) kbuf->next->prev = kbuf->prev;
if (kbuf->prev) kbuf->prev->next = kbuf->next;
else if (ctx->kmem_list == kbuf) ctx->kmem_list = kbuf->next;
for (i = 0; i < kbuf->buf.n_blocks; i++) {
if (kbuf->buf.blocks[i].ua) munmap(kbuf->buf.blocks[i].ua, kbuf->buf.blocks[i].size + kbuf->buf.blocks[i].alignment_offset);
kh.handle_id = kbuf->buf.blocks[i].handle_id;
kh.pa = kbuf->buf.blocks[i].pa;
ret = ioctl(ctx->handle, PCIDRIVER_IOC_KMEM_FREE, &kh);
if ((ret)&&(!err)) err = ret;
}
free(kbuf);
if (err) {
pcilib_error("PCIDRIVER_IOC_KMEM_FREE ioctl have failed");
}
}
int pcilib_sync_kernel_memory(pcilib_t *ctx, pcilib_kmem_handle_t *k, pcilib_kmem_sync_direction_t dir) {
int i;
int ret;
kmem_sync_t ks;
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)k;
ks.dir = dir;
for (i = 0; i < kbuf->buf.n_blocks; i++) {
ks.handle.handle_id = kbuf->buf.blocks[i].handle_id;
ks.handle.pa = kbuf->buf.blocks[i].pa;
ret = ioctl(ctx->handle, PCIDRIVER_IOC_KMEM_SYNC, &ks);
if (ret) {
pcilib_error("PCIDRIVER_IOC_KMEM_SYNC ioctl have failed");
return PCILIB_ERROR_FAILED;
}
if (!kbuf->buf.blocks[i].pa) {
kbuf->buf.blocks[i].pa = ks.handle.pa;
}
}
return 0;
}
void *pcilib_kmem_get_ua(pcilib_t *ctx, pcilib_kmem_handle_t *k) {
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)k;
return kbuf->buf.addr.ua + kbuf->buf.addr.alignment_offset + kbuf->buf.addr.mmap_offset;
}
uintptr_t pcilib_kmem_get_pa(pcilib_t *ctx, pcilib_kmem_handle_t *k) {
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)k;
return kbuf->buf.addr.pa + kbuf->buf.addr.alignment_offset;
}
void *pcilib_kmem_get_block_ua(pcilib_t *ctx, pcilib_kmem_handle_t *k, size_t block) {
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)k;
return kbuf->buf.blocks[block].ua + kbuf->buf.blocks[block].alignment_offset + kbuf->buf.blocks[block].mmap_offset;
}
uintptr_t pcilib_kmem_get_block_pa(pcilib_t *ctx, pcilib_kmem_handle_t *k, size_t block) {
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)k;
return kbuf->buf.blocks[block].pa + kbuf->buf.blocks[block].alignment_offset;
}
size_t pcilib_kmem_get_block_size(pcilib_t *ctx, pcilib_kmem_handle_t *k, size_t block) {
pcilib_kmem_list_t *kbuf = (pcilib_kmem_list_t*)k;
return kbuf->buf.blocks[block].size;
}
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