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- /**
- *
- * @file kmem.c
- * @brief This file contains all functions dealing with kernel memory.
- * @author Guillermo Marcus
- * @date 2009-04-05
- *
- */
- #include <linux/version.h>
- #include <linux/string.h>
- #include <linux/types.h>
- #include <linux/list.h>
- #include <linux/interrupt.h>
- #include <linux/pci.h>
- #include <linux/cdev.h>
- #include <linux/wait.h>
- #include <linux/mm.h>
- #include <linux/pagemap.h>
- #include "base.h"
- /**
- *
- * Allocates new kernel memory including the corresponding management structure, makes
- * it available via sysfs if possible.
- *
- */
- int pcidriver_kmem_alloc(pcidriver_privdata_t *privdata, kmem_handle_t *kmem_handle)
- {
- int flags;
- pcidriver_kmem_entry_t *kmem_entry;
- void *retptr;
- if (kmem_handle->flags&KMEM_FLAG_REUSE) {
- kmem_entry = pcidriver_kmem_find_entry_use(privdata, kmem_handle->use, kmem_handle->item);
- if (kmem_entry) {
- unsigned long flags = kmem_handle->flags;
- if (flags&KMEM_FLAG_TRY) {
- kmem_handle->type = kmem_entry->type;
- kmem_handle->size = kmem_entry->size;
- kmem_handle->align = kmem_entry->align;
- } else {
- if (kmem_handle->type != kmem_entry->type) {
- mod_info("Invalid type of reusable kmem_entry, currently: %lu, but requested: %lu\n", kmem_entry->type, kmem_handle->type);
- kmem_handle->type = kmem_entry->type;
- return -EINVAL;
- }
- if (((kmem_handle->type&PCILIB_KMEM_TYPE_MASK) == PCILIB_KMEM_TYPE_PAGE)&&(kmem_handle->size == 0)) {
- kmem_handle->size = kmem_entry->size;
- } else if (kmem_handle->size != kmem_entry->size) {
- mod_info("Invalid size of reusable kmem_entry, currently: %lu, but requested: %lu\n", kmem_entry->size, kmem_handle->size);
- kmem_handle->size = kmem_entry->size;
- return -EINVAL;
- }
- if (kmem_handle->align != kmem_entry->align) {
- mod_info("Invalid alignment of reusable kmem_entry, currently: %lu, but requested: %lu\n", kmem_entry->align, kmem_handle->align);
- kmem_handle->align = kmem_entry->align;
- return -EINVAL;
- }
- if (((kmem_entry->mode&KMEM_MODE_EXCLUSIVE)?1:0) != ((flags&KMEM_FLAG_EXCLUSIVE)?1:0)) {
- mod_info("Invalid mode of reusable kmem_entry\n");
- kmem_handle->flags = (kmem_entry->mode&KMEM_MODE_EXCLUSIVE)?KMEM_FLAG_EXCLUSIVE:0;
- return -EINVAL;
- }
- }
- if ((kmem_entry->mode&KMEM_MODE_COUNT)==KMEM_MODE_COUNT) {
- mod_info("Reuse counter of kmem_entry is overflown");
- return -EBUSY;
- }
- kmem_handle->handle_id = kmem_entry->id;
- kmem_handle->ba = (unsigned long)(kmem_entry->dma_handle);
- kmem_handle->pa = virt_to_phys((void*)kmem_entry->cpua);
- kmem_handle->flags = KMEM_FLAG_REUSED;
- if (kmem_entry->refs&KMEM_REF_HW) kmem_handle->flags |= KMEM_FLAG_REUSED_HW;
- if (kmem_entry->mode&KMEM_MODE_PERSISTENT) kmem_handle->flags |= KMEM_FLAG_REUSED_PERSISTENT;
- kmem_entry->mode += 1;
- if (flags&KMEM_FLAG_HW) {
- if ((kmem_entry->refs&KMEM_REF_HW)==0)
- pcidriver_module_get(privdata);
- kmem_entry->refs |= KMEM_REF_HW;
- }
- if (flags&KMEM_FLAG_PERSISTENT) kmem_entry->mode |= KMEM_MODE_PERSISTENT;
- privdata->kmem_cur_id = kmem_entry->id;
- return 0;
- }
- if (kmem_handle->flags&KMEM_FLAG_TRY) return -ENOENT;
- }
- /* First, allocate zeroed memory for the kmem_entry */
- if ((kmem_entry = kcalloc(1, sizeof(pcidriver_kmem_entry_t), GFP_KERNEL)) == NULL)
- goto kmem_alloc_entry_fail;
- /* Initialize the kmem_entry */
- kmem_entry->id = atomic_inc_return(&privdata->kmem_count) - 1;
- privdata->kmem_cur_id = kmem_entry->id;
- kmem_handle->handle_id = kmem_entry->id;
- kmem_entry->use = kmem_handle->use;
- kmem_entry->item = kmem_handle->item;
- kmem_entry->type = kmem_handle->type;
- kmem_entry->align = kmem_handle->align;
- kmem_entry->direction = PCI_DMA_NONE;
- /* Initialize sysfs if possible */
- if (pcidriver_sysfs_initialize_kmem(privdata, kmem_entry->id, &(kmem_entry->sysfs_attr)) != 0)
- goto kmem_alloc_mem_fail;
- /* ...and allocate the DMA memory */
- /* note this is a memory pair, referencing the same area: the cpu address (cpua)
- * and the PCI bus address (pa). The CPU and PCI addresses may not be the same.
- * The CPU sees only CPU addresses, while the device sees only PCI addresses.
- * CPU address is used for the mmap (internal to the driver), and
- * PCI address is the address passed to the DMA Controller in the device.
- */
- switch (kmem_entry->type&PCILIB_KMEM_TYPE_MASK) {
- case PCILIB_KMEM_TYPE_CONSISTENT:
- #ifdef PCIDRIVER_DUMMY_DEVICE
- retptr = kmalloc( kmem_handle->size, GFP_KERNEL);
- #else /* PCIDRIVER_DUMMY_DEVICE */
- retptr = pci_alloc_consistent( privdata->pdev, kmem_handle->size, &(kmem_entry->dma_handle) );
- #endif /* PCIDRIVER_DUMMY_DEVICE */
- break;
- case PCILIB_KMEM_TYPE_REGION:
- retptr = ioremap(kmem_handle->pa, kmem_handle->size);
- kmem_entry->dma_handle = kmem_handle->pa;
- if (kmem_entry->type == PCILIB_KMEM_TYPE_REGION_S2C) {
- kmem_entry->direction = PCI_DMA_TODEVICE;
- } else if (kmem_entry->type == PCILIB_KMEM_TYPE_REGION_C2S) {
- kmem_entry->direction = PCI_DMA_FROMDEVICE;
- }
- break;
- case PCILIB_KMEM_TYPE_PAGE:
- flags = GFP_KERNEL;
- if (kmem_handle->size == 0)
- kmem_handle->size = PAGE_SIZE;
- else if (kmem_handle->size%PAGE_SIZE)
- goto kmem_alloc_mem_fail;
- else
- flags |= __GFP_COMP;
- retptr = (void*)__get_free_pages(flags, get_order(kmem_handle->size));
- kmem_entry->dma_handle = 0;
- if (retptr) {
- #ifndef PCIDRIVER_DUMMY_DEVICE
- if (kmem_entry->type == PCILIB_KMEM_TYPE_DMA_S2C_PAGE) {
- kmem_entry->direction = PCI_DMA_TODEVICE;
- kmem_entry->dma_handle = pci_map_single(privdata->pdev, retptr, kmem_handle->size, PCI_DMA_TODEVICE);
- if (pci_dma_mapping_error(privdata->pdev, kmem_entry->dma_handle)) {
- free_pages((unsigned long)retptr, get_order(kmem_handle->size));
- goto kmem_alloc_mem_fail;
- }
- } else if (kmem_entry->type == PCILIB_KMEM_TYPE_DMA_C2S_PAGE) {
- kmem_entry->direction = PCI_DMA_FROMDEVICE;
- kmem_entry->dma_handle = pci_map_single(privdata->pdev, retptr, kmem_handle->size, PCI_DMA_FROMDEVICE);
- if (pci_dma_mapping_error(privdata->pdev, kmem_entry->dma_handle)) {
- free_pages((unsigned long)retptr, get_order(kmem_handle->size));
- goto kmem_alloc_mem_fail;
- }
- }
- #endif /* ! PCIDRIVER_DUMMY_DEVICE */
- }
- break;
- default:
- goto kmem_alloc_mem_fail;
- }
- if (retptr == NULL)
- goto kmem_alloc_mem_fail;
- kmem_entry->size = kmem_handle->size;
- kmem_entry->cpua = (unsigned long)retptr;
- kmem_handle->ba = (unsigned long)(kmem_entry->dma_handle);
- kmem_handle->pa = virt_to_phys(retptr);
- kmem_entry->mode = 1;
- if (kmem_handle->flags&KMEM_FLAG_REUSE) {
- kmem_entry->mode |= KMEM_MODE_REUSABLE;
- if (kmem_handle->flags&KMEM_FLAG_EXCLUSIVE) kmem_entry->mode |= KMEM_MODE_EXCLUSIVE;
- if (kmem_handle->flags&KMEM_FLAG_PERSISTENT) kmem_entry->mode |= KMEM_MODE_PERSISTENT;
- }
- kmem_entry->refs = 0;
- if (kmem_handle->flags&KMEM_FLAG_HW) {
- pcidriver_module_get(privdata);
- kmem_entry->refs |= KMEM_REF_HW;
- }
- kmem_handle->flags = 0;
- /* Add the kmem_entry to the list of the device */
- spin_lock( &(privdata->kmemlist_lock) );
- list_add_tail( &(kmem_entry->list), &(privdata->kmem_list) );
- spin_unlock( &(privdata->kmemlist_lock) );
- return 0;
- kmem_alloc_mem_fail:
- kfree(kmem_entry);
- kmem_alloc_entry_fail:
- return -ENOMEM;
- }
- static int pcidriver_kmem_free_check(pcidriver_privdata_t *privdata, kmem_handle_t *kmem_handle, pcidriver_kmem_entry_t *kmem_entry) {
- if ((kmem_handle->flags & KMEM_FLAG_FORCE) == 0) {
- if (kmem_entry->mode&KMEM_MODE_COUNT)
- kmem_entry->mode -= 1;
- if (kmem_handle->flags&KMEM_FLAG_HW) {
- if (kmem_entry->refs&KMEM_REF_HW)
- pcidriver_module_put(privdata);
- kmem_entry->refs &= ~KMEM_REF_HW;
- }
- if (kmem_handle->flags&KMEM_FLAG_PERSISTENT)
- kmem_entry->mode &= ~KMEM_MODE_PERSISTENT;
- if (kmem_handle->flags&KMEM_FLAG_REUSE)
- return 0;
- if (((kmem_entry->mode&KMEM_MODE_EXCLUSIVE)==0)&&(kmem_entry->mode&KMEM_MODE_COUNT)&&((kmem_handle->flags&KMEM_FLAG_EXCLUSIVE)==0))
- return 0;
- if (kmem_entry->refs) {
- kmem_entry->mode += 1;
- mod_info("can't free referenced kmem_entry, refs = %lx\n", kmem_entry->refs);
- return -EBUSY;
- }
- if (kmem_entry->mode & KMEM_MODE_PERSISTENT) {
- kmem_entry->mode += 1;
- mod_info("can't free persistent kmem_entry\n");
- return -EBUSY;
- }
- } else {
- if (kmem_entry->refs&KMEM_REF_HW)
- pcidriver_module_put(privdata);
- while (!atomic_add_negative(-1, &(privdata->refs))) pcidriver_module_put(privdata);
- atomic_inc(&(privdata->refs));
- }
- return 1;
- }
- static int pcidriver_kmem_free_use(pcidriver_privdata_t *privdata, kmem_handle_t *kmem_handle)
- {
- int err;
- int failed = 0;
- struct list_head *ptr, *next;
- pcidriver_kmem_entry_t *kmem_entry;
- /* iterate safely over the entries and delete them */
- list_for_each_safe(ptr, next, &(privdata->kmem_list)) {
- kmem_entry = list_entry(ptr, pcidriver_kmem_entry_t, list);
- if (kmem_entry->use == kmem_handle->use) {
- err = pcidriver_kmem_free_check(privdata, kmem_handle, kmem_entry);
- if (err > 0)
- pcidriver_kmem_free_entry(privdata, kmem_entry); /* spin lock inside! */
- else
- failed = 1;
- }
- }
- if (failed) {
- mod_info("Some kmem_entries for use %lx are still referenced\n", kmem_handle->use);
- return -EBUSY;
- }
- return 0;
- }
- /**
- *
- * Called via sysfs, frees kernel memory and the corresponding management structure
- *
- */
- int pcidriver_kmem_free( pcidriver_privdata_t *privdata, kmem_handle_t *kmem_handle )
- {
- int err;
- pcidriver_kmem_entry_t *kmem_entry;
- if (kmem_handle->flags&KMEM_FLAG_MASS) {
- kmem_handle->flags &= ~KMEM_FLAG_MASS;
- return pcidriver_kmem_free_use(privdata, kmem_handle);
- }
- /* Find the associated kmem_entry for this buffer */
- if ((kmem_entry = pcidriver_kmem_find_entry(privdata, kmem_handle)) == NULL)
- return -EINVAL; /* kmem_handle is not valid */
- err = pcidriver_kmem_free_check(privdata, kmem_handle, kmem_entry);
- if (err > 0)
- return pcidriver_kmem_free_entry(privdata, kmem_entry);
- return err;
- }
- /**
- *
- * Called when cleaning up, frees all kernel memory and their corresponding management structure
- *
- */
- int pcidriver_kmem_free_all(pcidriver_privdata_t *privdata)
- {
- // int failed = 0;
- struct list_head *ptr, *next;
- pcidriver_kmem_entry_t *kmem_entry;
- /* iterate safely over the entries and delete them */
- list_for_each_safe(ptr, next, &(privdata->kmem_list)) {
- kmem_entry = list_entry(ptr, pcidriver_kmem_entry_t, list);
- /*if (kmem_entry->refs)
- failed = 1;
- else*/
- pcidriver_kmem_free_entry(privdata, kmem_entry); /* spin lock inside! */
- }
- /*
- if (failed) {
- mod_info("Some kmem_entries are still referenced\n");
- return -EBUSY;
- }
- */
- return 0;
- }
- /**
- *
- * Synchronize memory to/from the device (or in both directions).
- *
- */
- int pcidriver_kmem_sync_entry( pcidriver_privdata_t *privdata, pcidriver_kmem_entry_t *kmem_entry, int direction)
- {
- if (kmem_entry->direction == PCI_DMA_NONE)
- return -EINVAL;
- #ifndef PCIDRIVER_DUMMY_DEVICE
- switch (direction) {
- case PCILIB_KMEM_SYNC_TODEVICE:
- pci_dma_sync_single_for_device( privdata->pdev, kmem_entry->dma_handle, kmem_entry->size, kmem_entry->direction );
- break;
- case PCILIB_KMEM_SYNC_FROMDEVICE:
- pci_dma_sync_single_for_cpu( privdata->pdev, kmem_entry->dma_handle, kmem_entry->size, kmem_entry->direction );
- break;
- case PCILIB_KMEM_SYNC_BIDIRECTIONAL:
- pci_dma_sync_single_for_device( privdata->pdev, kmem_entry->dma_handle, kmem_entry->size, kmem_entry->direction );
- pci_dma_sync_single_for_cpu( privdata->pdev, kmem_entry->dma_handle, kmem_entry->size, kmem_entry->direction );
- break;
- default:
- return -EINVAL; /* wrong direction parameter */
- }
- #endif /* ! PCIDRIVER_DUMMY_DEVICE */
- return 0; /* success */
- }
- /**
- *
- * Synchronize memory to/from the device (or in both directions).
- *
- */
- int pcidriver_kmem_sync( pcidriver_privdata_t *privdata, kmem_sync_t *kmem_sync )
- {
- pcidriver_kmem_entry_t *kmem_entry = NULL;
- /*
- * This is a shortcut to quickly find a next item in big multi-page kernel buffers
- */
- spin_lock(&(privdata->kmemlist_lock));
- if (privdata->kmem_last_sync) {
- if (privdata->kmem_last_sync->id == kmem_sync->handle.handle_id)
- kmem_entry = privdata->kmem_last_sync;
- else {
- privdata->kmem_last_sync = container_of(privdata->kmem_last_sync->list.next, pcidriver_kmem_entry_t, list);
- if (privdata->kmem_last_sync) {
- if (privdata->kmem_last_sync->id == kmem_sync->handle.handle_id)
- kmem_entry = privdata->kmem_last_sync;
- else
- privdata->kmem_last_sync = NULL;
- }
- }
- }
- spin_unlock(&(privdata->kmemlist_lock));
- /*
- * If not found go the standard way
- */
- if (!kmem_entry) {
- if ((kmem_entry = pcidriver_kmem_find_entry(privdata, &(kmem_sync->handle))) == NULL)
- return -EINVAL; /* kmem_handle is not valid */
- spin_lock(&(privdata->kmemlist_lock));
- privdata->kmem_last_sync = kmem_entry;
- spin_unlock(&(privdata->kmemlist_lock));
- }
- return pcidriver_kmem_sync_entry(privdata, kmem_entry, kmem_sync->dir);
- }
- /**
- *
- * Free the given kmem_entry and its memory.
- *
- */
- int pcidriver_kmem_free_entry(pcidriver_privdata_t *privdata, pcidriver_kmem_entry_t *kmem_entry)
- {
- pcidriver_sysfs_remove(privdata, &(kmem_entry->sysfs_attr));
- /* Release DMA memory */
- switch (kmem_entry->type&PCILIB_KMEM_TYPE_MASK) {
- case PCILIB_KMEM_TYPE_CONSISTENT:
- #ifdef PCIDRIVER_DUMMY_DEVICE
- kfree((void*)(kmem_entry->cpua));
- #else /* PCIDRIVER_DUMMY_DEVICE */
- pci_free_consistent( privdata->pdev, kmem_entry->size, (void *)(kmem_entry->cpua), kmem_entry->dma_handle );
- #endif /* PCIDRIVER_DUMMY_DEVICE */
- break;
- case PCILIB_KMEM_TYPE_REGION:
- iounmap((void *)(kmem_entry->cpua));
- break;
- case PCILIB_KMEM_TYPE_PAGE:
- #ifndef PCIDRIVER_DUMMY_DEVICE
- if (kmem_entry->dma_handle) {
- if (kmem_entry->type == PCILIB_KMEM_TYPE_DMA_S2C_PAGE) {
- pci_unmap_single(privdata->pdev, kmem_entry->dma_handle, kmem_entry->size, PCI_DMA_TODEVICE);
- } else if (kmem_entry->type == PCILIB_KMEM_TYPE_DMA_C2S_PAGE) {
- pci_unmap_single(privdata->pdev, kmem_entry->dma_handle, kmem_entry->size, PCI_DMA_FROMDEVICE);
- }
- }
- #endif /* ! PCIDRIVER_DUMMY_DEVICE */
- free_pages((unsigned long)kmem_entry->cpua, get_order(kmem_entry->size));
- break;
- }
- /* Remove the kmem list entry */
- spin_lock( &(privdata->kmemlist_lock) );
- if (privdata->kmem_last_sync == kmem_entry)
- privdata->kmem_last_sync = NULL;
- list_del( &(kmem_entry->list) );
- spin_unlock( &(privdata->kmemlist_lock) );
- /* Release kmem_entry memory */
- kfree(kmem_entry);
- return 0;
- }
- /**
- *
- * Find the corresponding kmem_entry for the given kmem_handle.
- *
- */
- pcidriver_kmem_entry_t *pcidriver_kmem_find_entry(pcidriver_privdata_t *privdata, kmem_handle_t *kmem_handle)
- {
- struct list_head *ptr;
- pcidriver_kmem_entry_t *entry, *result = NULL;
- /* should I implement it better using the handle_id? */
- spin_lock(&(privdata->kmemlist_lock));
- list_for_each(ptr, &(privdata->kmem_list)) {
- entry = list_entry(ptr, pcidriver_kmem_entry_t, list);
- if (entry->id == kmem_handle->handle_id) {
- result = entry;
- break;
- }
- }
- spin_unlock(&(privdata->kmemlist_lock));
- return result;
- }
- /**
- *
- * find the corresponding kmem_entry for the given id.
- *
- */
- pcidriver_kmem_entry_t *pcidriver_kmem_find_entry_id(pcidriver_privdata_t *privdata, int id)
- {
- struct list_head *ptr;
- pcidriver_kmem_entry_t *entry, *result = NULL;
- spin_lock(&(privdata->kmemlist_lock));
- list_for_each(ptr, &(privdata->kmem_list)) {
- entry = list_entry(ptr, pcidriver_kmem_entry_t, list);
- if (entry->id == id) {
- result = entry;
- break;
- }
- }
- spin_unlock(&(privdata->kmemlist_lock));
- return result;
- }
- /**
- *
- * find the corresponding kmem_entry for the given use and item.
- *
- */
- pcidriver_kmem_entry_t *pcidriver_kmem_find_entry_use(pcidriver_privdata_t *privdata, unsigned long use, unsigned long item)
- {
- struct list_head *ptr;
- pcidriver_kmem_entry_t *entry, *result = NULL;
- spin_lock(&(privdata->kmemlist_lock));
- list_for_each(ptr, &(privdata->kmem_list)) {
- entry = list_entry(ptr, pcidriver_kmem_entry_t, list);
- if ((entry->use == use)&&(entry->item == item)&&(entry->mode&KMEM_MODE_REUSABLE)) {
- result = entry;
- break;
- }
- }
- spin_unlock(&(privdata->kmemlist_lock));
- return result;
- }
- void pcidriver_kmem_mmap_close(struct vm_area_struct *vma) {
- unsigned long vma_size;
- pcidriver_kmem_entry_t *kmem_entry = (pcidriver_kmem_entry_t*)vma->vm_private_data;
- if (kmem_entry) {
- /*
- if (kmem_entry->id == 0) {
- mod_info("refs: %p %p %lx\n", vma, vma->vm_private_data, kmem_entry->refs);
- mod_info("kmem_size: %lu vma_size: %lu, s: %lx, e: %lx\n", kmem_entry->size, (vma->vm_end - vma->vm_start), vma->vm_start, vma->vm_end);
- }
- */
- vma_size = (vma->vm_end - vma->vm_start);
- if (kmem_entry->refs&KMEM_REF_COUNT) {
- kmem_entry->refs -= vma_size / PAGE_SIZE;
- }
- }
- }
- static struct vm_operations_struct pcidriver_kmem_mmap_ops = {
- .close = pcidriver_kmem_mmap_close
- };
- /**
- *
- * mmap() kernel memory to userspace.
- *
- */
- int pcidriver_mmap_kmem(pcidriver_privdata_t *privdata, struct vm_area_struct *vma)
- {
- unsigned long vma_size;
- pcidriver_kmem_entry_t *kmem_entry;
- int ret;
- mod_info_dbg("Entering mmap_kmem\n");
- /* FIXME: Is this really right? Always just the latest one? Can't we identify one? */
- /* Get latest entry on the kmem_list */
- kmem_entry = pcidriver_kmem_find_entry_id(privdata, privdata->kmem_cur_id);
- if (!kmem_entry) {
- mod_info("Trying to mmap a kernel memory buffer without creating it first!\n");
- return -EFAULT;
- }
- mod_info_dbg("Got kmem_entry with id: %d\n", kmem_entry->id);
- /* Check sizes */
- vma_size = (vma->vm_end - vma->vm_start);
- if ((vma_size > kmem_entry->size) &&
- ((kmem_entry->size < PAGE_SIZE) && (vma_size != PAGE_SIZE))) {
- mod_info("kem_entry size(%lu) and vma size do not match(%lu)\n", kmem_entry->size, vma_size);
- return -EINVAL;
- }
- /* reference counting */
- if ((kmem_entry->mode&KMEM_MODE_EXCLUSIVE)&&(kmem_entry->refs&KMEM_REF_COUNT)) {
- mod_info("can't make second mmaping for exclusive kmem_entry\n");
- return -EBUSY;
- }
- if (((kmem_entry->refs&KMEM_REF_COUNT) + (vma_size / PAGE_SIZE)) > KMEM_REF_COUNT) {
- mod_info("maximal amount of references is reached by kmem_entry\n");
- return -EBUSY;
- }
- kmem_entry->refs += vma_size / PAGE_SIZE;
- vma->vm_flags |= (VM_RESERVED);
- if ((kmem_entry->type&&PCILIB_KMEM_TYPE_MASK) == PCILIB_KMEM_TYPE_CONSISTENT) {
- // This is coherent memory, so it must not be cached.
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
- }
- mod_info_dbg("Mapping address %08lx / PFN %08lx\n",
- virt_to_phys((void*)kmem_entry->cpua),
- page_to_pfn(virt_to_page((void*)kmem_entry->cpua)));
- if ((kmem_entry->type&PCILIB_KMEM_TYPE_MASK) == PCILIB_KMEM_TYPE_REGION) {
- ret = remap_pfn_range(vma, vma->vm_start, (kmem_entry->dma_handle >> PAGE_SHIFT), (vma_size < kmem_entry->size)?vma_size:kmem_entry->size, vma->vm_page_prot);
- } else {
- ret = remap_pfn_range(vma, vma->vm_start, page_to_pfn(virt_to_page((void*)(kmem_entry->cpua))), (vma_size < kmem_entry->size)?vma_size:kmem_entry->size, vma->vm_page_prot);
- }
- if (ret) {
- mod_info("kmem remap failed: %d (%lx)\n", ret,kmem_entry->cpua);
- kmem_entry->refs -= 1;
- return -EAGAIN;
- }
- vma->vm_ops = &pcidriver_kmem_mmap_ops;
- vma->vm_private_data = (void*)kmem_entry;
- return ret;
- }
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