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-rw-r--r--drivers/firewire/core-cdev.c51
-rw-r--r--drivers/firewire/core-iso.c80
-rw-r--r--drivers/firewire/core.h7
-rw-r--r--include/linux/firewire.h1
4 files changed, 100 insertions, 39 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index 2e6b245..2783f69 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -22,6 +22,7 @@
#include <linux/compat.h>
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/firewire.h>
#include <linux/firewire-cdev.h>
@@ -70,6 +71,7 @@ struct client {
u64 iso_closure;
struct fw_iso_buffer buffer;
unsigned long vm_start;
+ bool buffer_is_mapped;
struct list_head phy_receiver_link;
u64 phy_receiver_closure;
@@ -959,11 +961,20 @@ static void iso_mc_callback(struct fw_iso_context *context,
sizeof(e->interrupt), NULL, 0);
}
+static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context)
+{
+ if (context->type == FW_ISO_CONTEXT_TRANSMIT)
+ return DMA_TO_DEVICE;
+ else
+ return DMA_FROM_DEVICE;
+}
+
static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
{
struct fw_cdev_create_iso_context *a = &arg->create_iso_context;
struct fw_iso_context *context;
fw_iso_callback_t cb;
+ int ret;
BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT ||
FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE ||
@@ -1004,8 +1015,21 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg)
if (client->iso_context != NULL) {
spin_unlock_irq(&client->lock);
fw_iso_context_destroy(context);
+
return -EBUSY;
}
+ if (!client->buffer_is_mapped) {
+ ret = fw_iso_buffer_map_dma(&client->buffer,
+ client->device->card,
+ iso_dma_direction(context));
+ if (ret < 0) {
+ spin_unlock_irq(&client->lock);
+ fw_iso_context_destroy(context);
+
+ return ret;
+ }
+ client->buffer_is_mapped = true;
+ }
client->iso_closure = a->closure;
client->iso_context = context;
spin_unlock_irq(&client->lock);
@@ -1651,7 +1675,6 @@ static long fw_device_op_compat_ioctl(struct file *file,
static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
{
struct client *client = file->private_data;
- enum dma_data_direction direction;
unsigned long size;
int page_count, ret;
@@ -1674,20 +1697,28 @@ static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
if (size & ~PAGE_MASK)
return -EINVAL;
- if (vma->vm_flags & VM_WRITE)
- direction = DMA_TO_DEVICE;
- else
- direction = DMA_FROM_DEVICE;
-
- ret = fw_iso_buffer_init(&client->buffer, client->device->card,
- page_count, direction);
+ ret = fw_iso_buffer_alloc(&client->buffer, page_count);
if (ret < 0)
return ret;
- ret = fw_iso_buffer_map(&client->buffer, vma);
+ spin_lock_irq(&client->lock);
+ if (client->iso_context) {
+ ret = fw_iso_buffer_map_dma(&client->buffer,
+ client->device->card,
+ iso_dma_direction(client->iso_context));
+ client->buffer_is_mapped = (ret == 0);
+ }
+ spin_unlock_irq(&client->lock);
if (ret < 0)
- fw_iso_buffer_destroy(&client->buffer, client->device->card);
+ goto fail;
+ ret = fw_iso_buffer_map_vma(&client->buffer, vma);
+ if (ret < 0)
+ goto fail;
+
+ return 0;
+ fail:
+ fw_iso_buffer_destroy(&client->buffer, client->device->card);
return ret;
}
diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index d156582..8382e27 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -39,52 +39,73 @@
* Isochronous DMA context management
*/
-int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
- int page_count, enum dma_data_direction direction)
+int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count)
{
- int i, j;
- dma_addr_t address;
-
- buffer->page_count = page_count;
- buffer->direction = direction;
+ int i;
+ buffer->page_count = 0;
+ buffer->page_count_mapped = 0;
buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
GFP_KERNEL);
if (buffer->pages == NULL)
- goto out;
+ return -ENOMEM;
- for (i = 0; i < buffer->page_count; i++) {
+ for (i = 0; i < page_count; i++) {
buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
if (buffer->pages[i] == NULL)
- goto out_pages;
+ break;
+ }
+ buffer->page_count = i;
+ if (i < page_count) {
+ fw_iso_buffer_destroy(buffer, NULL);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
+ enum dma_data_direction direction)
+{
+ dma_addr_t address;
+ int i;
+
+ buffer->direction = direction;
+
+ for (i = 0; i < buffer->page_count; i++) {
address = dma_map_page(card->device, buffer->pages[i],
0, PAGE_SIZE, direction);
- if (dma_mapping_error(card->device, address)) {
- __free_page(buffer->pages[i]);
- goto out_pages;
- }
+ if (dma_mapping_error(card->device, address))
+ break;
+
set_page_private(buffer->pages[i], address);
}
+ buffer->page_count_mapped = i;
+ if (i < buffer->page_count)
+ return -ENOMEM;
return 0;
+}
- out_pages:
- for (j = 0; j < i; j++) {
- address = page_private(buffer->pages[j]);
- dma_unmap_page(card->device, address,
- PAGE_SIZE, direction);
- __free_page(buffer->pages[j]);
- }
- kfree(buffer->pages);
- out:
- buffer->pages = NULL;
+int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
+ int page_count, enum dma_data_direction direction)
+{
+ int ret;
+
+ ret = fw_iso_buffer_alloc(buffer, page_count);
+ if (ret < 0)
+ return ret;
+
+ ret = fw_iso_buffer_map_dma(buffer, card, direction);
+ if (ret < 0)
+ fw_iso_buffer_destroy(buffer, card);
- return -ENOMEM;
+ return ret;
}
EXPORT_SYMBOL(fw_iso_buffer_init);
-int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
+int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
+ struct vm_area_struct *vma)
{
unsigned long uaddr;
int i, err;
@@ -107,15 +128,18 @@ void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
int i;
dma_addr_t address;
- for (i = 0; i < buffer->page_count; i++) {
+ for (i = 0; i < buffer->page_count_mapped; i++) {
address = page_private(buffer->pages[i]);
dma_unmap_page(card->device, address,
PAGE_SIZE, buffer->direction);
- __free_page(buffer->pages[i]);
}
+ for (i = 0; i < buffer->page_count; i++)
+ __free_page(buffer->pages[i]);
kfree(buffer->pages);
buffer->pages = NULL;
+ buffer->page_count = 0;
+ buffer->page_count_mapped = 0;
}
EXPORT_SYMBOL(fw_iso_buffer_destroy);
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h
index 9047f55..94257ae 100644
--- a/drivers/firewire/core.h
+++ b/drivers/firewire/core.h
@@ -3,6 +3,7 @@
#include <linux/compiler.h>
#include <linux/device.h>
+#include <linux/dma-mapping.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/idr.h>
@@ -169,7 +170,11 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event);
/* -iso */
-int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
+int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count);
+int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
+ enum dma_data_direction direction);
+int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
+ struct vm_area_struct *vma);
/* -topology */
diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index cdc9b71..0a19057 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -391,6 +391,7 @@ struct fw_iso_buffer {
enum dma_data_direction direction;
struct page **pages;
int page_count;
+ int page_count_mapped;
};
int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
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