North West Logick DMA implementation

1 files changed, 166 insertions, 0 deletions

diff --git a/kmem.c b/kmem.c
new file mode 100644
index 0000000..8388f2a
--- /dev/null
+++ b/kmem.c
@@ -0,0 +1,166 @@
+#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;
+
+    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 (!i) {
+	    if (kh.pa % alignment) printf("Alignment problem\n");
+	    else if (kh.pa & ctx->page_mask) printf("Mmap alignment problem\n");
+	}
+
+    	addr = mmap( 0, kh.size, 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;
+    }
+    
+    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);
+
+        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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}