BMMv2: dma_buf based BMMHEADv2.0.0master

This is a complete redesign and rewrite of libbmm.  This implementation
is based upon dma_bufs - where a dma_buf is a kernel-side buffer which
can be passed to and from other subsystems.  libbmm becomes a provider
of dma_bufs - it permits userspace to allocate such things.

When a dma_buf is allocated, userspace is handed a file descriptor
which is unique to this buffer.  This file descriptor can then be
passed into other subsystems, which can then request access to this
buffer.

The file descriptor supports very few operations - it can be mmap()d to
provide userspace access to the buffer, and it can be closed when it is
no longer required.  Internally in the kernel, dma_bufs are reference
counted, so the dma_buf will only be freed when the last user gives up
its reference.

1 files changed, 0 insertions, 287 deletions

diff --git a/bmm_lib.pmem.c b/bmm_lib.pmem.c
deleted file mode 100644
index cb74a11..0000000
--- a/bmm_lib.pmem.c
+++ /dev/null
@@ -1,287 +0,0 @@
-/*
- *  bmm_lib.c
- *
- *  Buffer Management Module for vMeta
- *
- *  based on Android PMEM
- *
- *  Steve Guo (steve.guo@marvell.com)
-
- *(C) Copyright 2007 Marvell International Ltd.
- * All Rights Reserved
- */
-
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <linux/android_pmem.h>
-#include <stdio.h>
-#include <stdlib.h>
-#define LOG_TAG "bmm-lib"
-#include <utils/Log.h>
-
-#include "bmm_lib.h"
-
-//#define DEBUG
-
-#ifdef DEBUG
-  #define pr_debug(fmt, arg...) LOGD(fmt, ##arg)
-#else
-  #define pr_debug(fmt, arg...) do { } while(0)
-#endif
-
-#define pr_error(fmt, arg...) LOGE(fmt, ##arg)
-#define NO_IMPLEMENTED LOGE("%s is not implemented yet.", __FUNCTION__)
-
-#define PMEM_DEVICE_FILE "/dev/pmem_adsp"
-
-
-/* We recorded all malloced physical address into a list. Due to the implementation of
-pmem, we can only open a new file to malloc some memory and close it to free memory. So
-we also record the opened fd associated with physical and virtual address map. */
-struct memory_item
-{
-	int fd;
-	void *paddr;
-	void *vaddr;
-	int size;
-	struct memory_item *next;
-};
-
-static struct memory_item *header = NULL;
-
-int bmm_init()
-{
-	pr_debug("bmm_init");
-	header = NULL;
-	return 0;
-}
-
-void bmm_exit()
-{
-	struct memory_item *cur = header;
-	struct memory_item *next = NULL;
-	pr_debug("bmm_exit");
-	while(cur != NULL)
-	{
-		next = cur->next;
-		munmap(cur->vaddr, cur->size);
-		close(cur->fd);
-		free(cur);
-		cur = next;
-	}
-}
-
-void *bmm_malloc(unsigned long size, int attr)
-{
-	void *vaddr;
-	int pmem_fd = 0;
-	struct memory_item *item = NULL;
-	struct pmem_region region;
-	int ret;
-
-	if(size == 0)
-		return NULL;
-
-	pr_debug("bmm_malloc %d", size);
-
-        /* attempt to open the PMEM driver */
-	pmem_fd = open(PMEM_DEVICE_FILE, O_RDWR);
-	if(pmem_fd <=0)
-	{
-		pr_error("cannot open %s file", PMEM_DEVICE_FILE);	
-		return NULL;
-	}
-
-	vaddr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, pmem_fd, 0);
-	if((int)vaddr == -1)
-	{
-		pr_error("mmap %d failed, most likely no memory", size);
-		close(pmem_fd);
-		return NULL;
-	}
-
-	ret = ioctl(pmem_fd, PMEM_GET_PHYS, &region);
-        if(ret != 0)
-        {
-                pr_error("call PMEM_GET_PHYS failed");
-		munmap(vaddr, size);
-                close(pmem_fd);
-                return NULL;
-        }
-
-	item = (struct memory_item*)malloc(sizeof(struct memory_item));
-	memset(item, 0 , sizeof(struct memory_item));
-	item->fd = pmem_fd;
-	item->paddr = (void*)region.offset;
-	item->vaddr = vaddr;
-	item->size = size;
-
-	if(header == NULL)
-	{
-		header = item;
-	}
-	else
-	{
-		item->next = header;
-		header = item;
-	}
-	return vaddr;
-}
-
-void bmm_free(void *vaddr)
-{
-	pr_debug("bmm_free");
-	struct memory_item *cur = header;
-	struct memory_item *prev = NULL;
-	struct memory_item *next = NULL;
-	while(cur != NULL)
-	{
-		next = cur->next;
-		if(cur->vaddr == vaddr)
-		{
-			munmap(cur->vaddr, cur->size);
-			close(cur->fd);
-			if(prev == NULL)
-			{
-				header = next;
-			}
-			else
-			{
-				prev->next = next;
-			}
-			free(cur);
-			return;
-		}
-		prev = cur;
-		cur = next;
-	}
-}
-
-void *bmm_attach(void *paddr, unsigned long len)
-{
-	NO_IMPLEMENTED;
-	return NULL;
-}
-
-void bmm_detach(void *vaddr, unsigned long len)
-{
-	NO_IMPLEMENTED;
-}
-
-void *bmm_get_vaddr(void *paddr)
-{
-	pr_debug("bmm_get_vaddr");
-	struct memory_item *cur = header;
-	while(cur != NULL)
-	{
-		if(cur->paddr == paddr)
-			return cur->vaddr;
-		cur = cur->next;
-	}
-	return NULL;
-}
-
-void *bmm_get_paddr(void *vaddr)
-{
-	pr_debug("bmm_get_paddr");
-	struct memory_item *cur = header;
-	while(cur != NULL)
-	{
-		if(cur->vaddr == vaddr)
-			return cur->paddr;
-		cur = cur->next;
-	}
-	return NULL;
-}
-
-unsigned long bmm_get_mem_size(void *vaddr)
-{
-	struct memory_item *cur = header;
-	while(cur != NULL)
-	{
-		if(cur->vaddr == vaddr)
-			return cur->size;
-		cur = cur->next;
-	}
-	return 0;
-}
-
-int bmm_get_mem_attr(void *vaddr)
-{
-	NO_IMPLEMENTED;
-	return 0;
-}
-
-int bmm_set_mem_attr(void *vaddr, int attr)
-{
-	NO_IMPLEMENTED;
-	return 0;
-}
-
-unsigned long bmm_get_total_space()
-{
-	int pmem_fd = 0;
-	struct pmem_region region;
-	int ret;
-
-	/* attempt to open the PMEM driver */
-	pmem_fd = open(PMEM_DEVICE_FILE, O_RDWR);
-	if(pmem_fd <=0)
-	{
-		pr_error("cannot open %s file", PMEM_DEVICE_FILE);
-		return 0;
-	}
-
-	ret = ioctl(pmem_fd, PMEM_GET_TOTAL_SIZE, &region);
-	if(ret != 0)
-	{
-		pr_error("call PMEM_GET_TOTAL_SIZE failed");
-		close(pmem_fd);
-		return 0;
-	}	
-	close(pmem_fd);
-	return region.len;
-}
-
-unsigned long bmm_get_free_space()
-{
-	NO_IMPLEMENTED;
-	return 0;
-}
-
-unsigned long bmm_get_allocated_space()
-{
-        NO_IMPLEMENTED;
-        return 0;
-}
-
-void bmm_flush_cache(void *vaddr, int dir)
-{
-	NO_IMPLEMENTED;
-}
-
-void *bmm_dma_memcpy(void *dest, const void *src, size_t n)
-{
-	NO_IMPLEMENTED;
-	return NULL;
-}
-
-void bmm_dma_sync()
-{
-	NO_IMPLEMENTED;
-}
-
-void bmm_flush_cache_range(void *start, size_t size, int direction)
-{
-	NO_IMPLEMENTED;
-}
-
-void bmm_dump()
-{
-	NO_IMPLEMENTED;
-}
-