Split bar manipulation and fifo operations in stand-alone source and publish kmem and bar headers

1 files changed, 197 insertions, 0 deletions

diff --git a/pcilib/bar.c b/pcilib/bar.c
new file mode 100644
index 0000000..a2670c0
--- /dev/null
+++ b/pcilib/bar.c
@@ -0,0 +1,197 @@
+#define _BSD_SOURCE
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include <stdint.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 "tools.h"
+#include "error.h"
+#include "model.h"
+#include "plugin.h"
+
+pcilib_bar_t pcilib_detect_bar(pcilib_t *ctx, uintptr_t addr, size_t size) {
+    int n = 0;
+    pcilib_bar_t i;
+	
+    const pcilib_board_info_t *board_info = pcilib_get_board_info(ctx);
+    if (!board_info) return PCILIB_BAR_INVALID;
+		
+    for (i = 0; i < PCILIB_MAX_BARS; i++) {
+	if (board_info->bar_length[i] > 0) {
+	    if ((addr >= board_info->bar_start[i])&&((board_info->bar_start[i] + board_info->bar_length[i]) >= (addr + size))) return i;
+
+	    if (n) n = -1;
+	    else n = i + 1;
+	}
+    }
+
+    if (n > 0) return n - 1;
+
+    return PCILIB_BAR_INVALID;
+}
+
+int pcilib_detect_address(pcilib_t *ctx, pcilib_bar_t *bar, uintptr_t *addr, size_t size) {
+    const pcilib_board_info_t *board_info = pcilib_get_board_info(ctx);
+    if (!board_info) return PCILIB_ERROR_NOTFOUND;
+    
+    if (*bar == PCILIB_BAR_DETECT) {
+	*bar = pcilib_detect_bar(ctx, *addr, size);
+	if (*bar == PCILIB_BAR_INVALID) {
+	    pcilib_error("The requested data block at address 0x%x with size %zu does not belongs to any available memory bar", *addr, size);
+	    return PCILIB_ERROR_NOTFOUND;
+	}
+	if (*addr < board_info->bar_start[*bar]) 
+	    *addr += board_info->bar_start[*bar];
+    } else {
+	if ((*addr < board_info->bar_start[*bar])||((board_info->bar_start[*bar] + board_info->bar_length[*bar]) < (((uintptr_t)*addr) + size))) {
+	    if ((board_info->bar_length[*bar]) >= (((uintptr_t)*addr) + size)) {
+		*addr += board_info->bar_start[*bar];
+	    } else {
+		pcilib_error("The requested data block at address 0x%x with size %zu does not belong the specified memory bar (Bar %i: starting at 0x%x with size 0x%x)", *addr, size, *bar, board_info->bar_start[*bar], board_info->bar_length[*bar]);
+		return PCILIB_ERROR_NOTFOUND;
+	    }
+	}
+    }
+
+    *addr -= board_info->bar_start[*bar];
+    *addr += board_info->bar_start[*bar] & ctx->page_mask;
+
+    return 0;
+}
+
+void *pcilib_map_bar(pcilib_t *ctx, pcilib_bar_t bar) {
+    void *res;
+    int ret; 
+
+    const pcilib_board_info_t *board_info = pcilib_get_board_info(ctx);
+    if (!board_info) return NULL;
+    
+    if (ctx->bar_space[bar]) return ctx->bar_space[bar];
+    
+    ret = ioctl( ctx->handle, PCIDRIVER_IOC_MMAP_MODE, PCIDRIVER_MMAP_PCI );
+    if (ret) {
+	pcilib_error("PCIDRIVER_IOC_MMAP_MODE ioctl have failed", bar);
+	return NULL;
+    }
+
+    ret = ioctl( ctx->handle, PCIDRIVER_IOC_MMAP_AREA, PCIDRIVER_BAR0 + bar );
+    if (ret) {
+	pcilib_error("PCIDRIVER_IOC_MMAP_AREA ioctl have failed for bank %i", bar);
+	return NULL;
+    }
+
+#ifdef PCILIB_FILE_IO
+    file_io_handle = open("/root/data", O_RDWR);
+    res = mmap( 0, board_info->bar_length[bar], PROT_WRITE | PROT_READ, MAP_SHARED, ctx->file_io_handle, 0 );
+#else
+    res = mmap( 0, board_info->bar_length[bar], PROT_WRITE | PROT_READ, MAP_SHARED, ctx->handle, 0 );
+#endif
+    if ((!res)||(res == MAP_FAILED)) {
+	pcilib_error("Failed to mmap data bank %i", bar);
+	return NULL;
+    }
+
+    
+    return res;
+}
+
+void pcilib_unmap_bar(pcilib_t *ctx, pcilib_bar_t bar, void *data) {
+    const pcilib_board_info_t *board_info = pcilib_get_board_info(ctx);
+    if (!board_info) return;
+
+    if (ctx->bar_space[bar]) return;
+    
+    munmap(data, board_info->bar_length[bar]);
+#ifdef PCILIB_FILE_IO
+    close(ctx->file_io_handle);
+#endif
+}
+
+int pcilib_map_register_space(pcilib_t *ctx) {
+    int err;
+    pcilib_register_bank_t i;
+    
+    if (!ctx->reg_bar_mapped)  {
+	const pcilib_model_description_t *model_info = pcilib_get_model_description(ctx);
+	const pcilib_register_bank_description_t *banks = model_info->banks;
+    
+	for (i = 0; ((banks)&&(banks[i].access)); i++) {
+//	    uint32_t buf[2];
+	    void *reg_space;
+            pcilib_bar_t bar = banks[i].bar;
+
+	    if (bar == PCILIB_BAR_DETECT) {
+		uintptr_t addr = banks[0].read_addr;
+	    
+		err = pcilib_detect_address(ctx, &bar, &addr, 1);
+		if (err) return err;
+		
+		if (!ctx->bar_space[bar]) {
+		    reg_space = pcilib_map_bar(ctx, bar);
+//		    pcilib_memcpy(&buf, reg_space, 8);
+	    
+		    if (reg_space) {
+			ctx->bar_space[bar] = reg_space;
+		    } else {
+			return PCILIB_ERROR_FAILED;
+		    }
+		}
+	    } else if (!ctx->bar_space[bar]) {
+		reg_space = pcilib_map_bar(ctx, bar);
+		if (reg_space) {
+		    ctx->bar_space[bar] = reg_space;
+		} else {
+		    return PCILIB_ERROR_FAILED;
+		}
+//		pcilib_memcpy(&buf, reg_space, 8);
+		
+	    }
+	    
+	    if (!i) ctx->reg_bar = bar;
+	}
+	
+	
+	ctx->reg_bar_mapped = 1;
+    }
+    
+    return 0;
+}
+
+int pcilib_read(pcilib_t *ctx, pcilib_bar_t bar, uintptr_t addr, size_t size, void *buf) {
+    void *data;
+
+    pcilib_detect_address(ctx, &bar, &addr, size);
+    data = pcilib_map_bar(ctx, bar);
+
+    pcilib_memcpy(buf, data + addr, size);
+
+    pcilib_unmap_bar(ctx, bar, data);
+
+    return 0;
+}
+
+int pcilib_write(pcilib_t *ctx, pcilib_bar_t bar, uintptr_t addr, size_t size, void *buf) {
+    void *data;
+
+    pcilib_detect_address(ctx, &bar, &addr, size);
+    data = pcilib_map_bar(ctx, bar);
+
+    pcilib_memcpy(data + addr, buf, size);
+
+    pcilib_unmap_bar(ctx, bar, data);
+
+    return 0;
+}
+