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firewire: Split the iso buffer out from fw_iso_context and avoid vmalloc.

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This patch splits out the iso buffer so we can initialize it at mmap
time with the size provided in the mmap call.  Furthermore, allocate
the backing pages using alloc_page to avoid setting up kernel side
virtual memory mappings for the pages.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-02-16 17:34:38 -05:00 committed by Stefan Richter
parent 6e2e8424d3
commit 9aad812538
5 changed files with 148 additions and 81 deletions
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65
drivers/firewire/fw-device-cdev.c
View File

@ -71,8 +71,10 @@ struct client {
struct list_head event_list;
struct semaphore event_list_sem;
wait_queue_head_t wait;
unsigned long vm_start;
struct fw_iso_context *iso_context;
struct fw_iso_buffer buffer;
unsigned long vm_start;
};
static inline void __user *
@ -406,7 +408,6 @@ static int ioctl_create_iso_context(struct client *client, void __user *arg)
client->iso_context = fw_iso_context_create(client->device->card,
FW_ISO_CONTEXT_TRANSMIT,
request.buffer_size,
iso_callback, client);
if (IS_ERR(client->iso_context))
return PTR_ERR(client->iso_context);
@ -418,8 +419,7 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
{
struct fw_cdev_queue_iso request;
struct fw_cdev_iso_packet __user *p, *end, *next;
void *payload, *payload_end;
unsigned long index;
unsigned long payload, payload_end;
int count;
struct {
struct fw_iso_packet packet;
@ -434,20 +434,17 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
/* If the user passes a non-NULL data pointer, has mmap()'ed
* the iso buffer, and the pointer points inside the buffer,
* we setup the payload pointers accordingly. Otherwise we
* set them both to NULL, which will still let packets with
* set them both to 0, which will still let packets with
* payload_length == 0 through. In other words, if no packets
* use the indirect payload, the iso buffer need not be mapped
* and the request.data pointer is ignored.*/
index = (unsigned long)request.data - client->vm_start;
if (request.data != 0 && client->vm_start != 0 &&
index <= client->iso_context->buffer_size) {
payload = client->iso_context->buffer + index;
payload_end = client->iso_context->buffer +
client->iso_context->buffer_size;
} else {
payload = NULL;
payload_end = NULL;
payload = (unsigned long)request.data - client->vm_start;
payload_end = payload + (client->buffer.page_count << PAGE_SHIFT);
if (request.data == 0 || client->buffer.pages == NULL ||
payload >= payload_end) {
payload = 0;
payload_end = 0;
}
if (!access_ok(VERIFY_READ, request.packets, request.size))
@ -473,7 +470,7 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
return -EINVAL;
if (fw_iso_context_queue(client->iso_context,
&u.packet, payload))
&u.packet, &client->buffer, payload))
break;
p = next;
@ -483,8 +480,7 @@ static int ioctl_queue_iso(struct client *client, void __user *arg)
request.size -= uptr_to_u64(p) - request.packets;
request.packets = uptr_to_u64(p);
request.data =
client->vm_start + (payload - client->iso_context->buffer);
request.data = client->vm_start + payload;
if (copy_to_user(arg, &request, sizeof request))
return -EFAULT;
@ -549,13 +545,41 @@ 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, retval;
if (client->iso_context->buffer == NULL)
/* FIXME: We could support multiple buffers, but we don't. */
if (client->buffer.pages != NULL)
return -EBUSY;
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
if (vma->vm_start & ~PAGE_MASK)
return -EINVAL;
client->vm_start = vma->vm_start;
size = vma->vm_end - vma->vm_start;
page_count = size >> PAGE_SHIFT;
if (size & ~PAGE_MASK)
return -EINVAL;
return remap_vmalloc_range(vma, client->iso_context->buffer, 0);
if (vma->vm_flags & VM_WRITE)
direction = DMA_TO_DEVICE;
else
direction = DMA_FROM_DEVICE;
retval = fw_iso_buffer_init(&client->buffer, client->device->card,
page_count, direction);
if (retval < 0)
return retval;
retval = fw_iso_buffer_map(&client->buffer, vma);
if (retval < 0)
fw_iso_buffer_destroy(&client->buffer, client->device->card);
return retval;
}
static int fw_device_op_release(struct inode *inode, struct file *file)
@ -564,6 +588,9 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
struct address_handler *h, *next;
struct request *r, *next_r;
if (client->buffer.pages)
fw_iso_buffer_destroy(&client->buffer, client->device->card);
if (client->iso_context)
fw_iso_context_destroy(client->iso_context);

2
drivers/firewire/fw-device-cdev.h
View File

@ -126,7 +126,7 @@ struct fw_cdev_allocate {
};
struct fw_cdev_create_iso_context {
__u32 buffer_size;
__u32 handle;
};
struct fw_cdev_iso_packet {

112
drivers/firewire/fw-iso.c
View File

@ -28,68 +28,88 @@
#include "fw-topology.h"
#include "fw-device.h"
static int
setup_iso_buffer(struct fw_iso_context *ctx, size_t size,
enum dma_data_direction direction)
int
fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
int page_count, enum dma_data_direction direction)
{
struct page *page;
int i, j;
void *p;
int i, j, retval = -ENOMEM;
dma_addr_t address;
ctx->buffer_size = PAGE_ALIGN(size);
if (size == 0)
return 0;
buffer->page_count = page_count;
buffer->direction = direction;
ctx->buffer = vmalloc_32_user(ctx->buffer_size);
if (ctx->buffer == NULL)
goto fail_buffer_alloc;
buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
GFP_KERNEL);
if (buffer->pages == NULL)
goto out;
ctx->page_count = ctx->buffer_size >> PAGE_SHIFT;
ctx->pages =
kzalloc(ctx->page_count * sizeof(ctx->pages[0]), GFP_KERNEL);
if (ctx->pages == NULL)
goto fail_pages_alloc;
p = ctx->buffer;
for (i = 0; i < ctx->page_count; i++, p += PAGE_SIZE) {
page = vmalloc_to_page(p);
ctx->pages[i] = dma_map_page(ctx->card->device,
page, 0, PAGE_SIZE, direction);
if (dma_mapping_error(ctx->pages[i]))
goto fail_mapping;
for (i = 0; i < buffer->page_count; i++) {
buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32);
if (buffer->pages[i] == NULL)
goto out_pages;
address = dma_map_page(card->device, buffer->pages[i],
0, PAGE_SIZE, direction);
if (dma_mapping_error(address)) {
__free_page(buffer->pages[i]);
goto out_pages;
}
set_page_private(buffer->pages[i], address);
}
return 0;
fail_mapping:
for (j = 0; j < i; j++)
dma_unmap_page(ctx->card->device, ctx->pages[j],
out_pages:
for (j = 0; j < i; j++) {
address = page_private(buffer->pages[j]);
dma_unmap_page(card->device, address,
PAGE_SIZE, DMA_TO_DEVICE);
fail_pages_alloc:
vfree(ctx->buffer);
fail_buffer_alloc:
return -ENOMEM;
__free_page(buffer->pages[j]);
}
kfree(buffer->pages);
out:
buffer->pages = NULL;
return retval;
}
static void destroy_iso_buffer(struct fw_iso_context *ctx)
int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
{
unsigned long uaddr;
int i, retval;
uaddr = vma->vm_start;
for (i = 0; i < buffer->page_count; i++) {
retval = vm_insert_page(vma, uaddr, buffer->pages[i]);
if (retval)
return retval;
uaddr += PAGE_SIZE;
}
return 0;
}
void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
struct fw_card *card)
{
int i;
dma_addr_t address;
for (i = 0; i < ctx->page_count; i++)
dma_unmap_page(ctx->card->device, ctx->pages[i],
for (i = 0; i < buffer->page_count; i++) {
address = page_private(buffer->pages[i]);
dma_unmap_page(card->device, address,
PAGE_SIZE, DMA_TO_DEVICE);
__free_page(buffer->pages[i]);
}
kfree(ctx->pages);
vfree(ctx->buffer);
kfree(buffer->pages);
buffer->pages = NULL;
}
struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type,
size_t buffer_size,
fw_iso_callback_t callback,
void *callback_data)
{
struct fw_iso_context *ctx;
int retval;
ctx = card->driver->allocate_iso_context(card, type);
if (IS_ERR(ctx))
@ -100,12 +120,6 @@ struct fw_iso_context *fw_iso_context_create(struct fw_card *card, int type,
ctx->callback = callback;
ctx->callback_data = callback_data;
retval = setup_iso_buffer(ctx, buffer_size, DMA_TO_DEVICE);
if (retval < 0) {
card->driver->free_iso_context(ctx);
return ERR_PTR(retval);
}
return ctx;
}
EXPORT_SYMBOL(fw_iso_context_create);
@ -114,8 +128,6 @@ void fw_iso_context_destroy(struct fw_iso_context *ctx)
{
struct fw_card *card = ctx->card;
destroy_iso_buffer(ctx);
card->driver->free_iso_context(ctx);
}
EXPORT_SYMBOL(fw_iso_context_destroy);
@ -133,10 +145,12 @@ EXPORT_SYMBOL(fw_iso_context_send);
int
fw_iso_context_queue(struct fw_iso_context *ctx,
struct fw_iso_packet *packet, void *payload)
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
{
struct fw_card *card = ctx->card;
return card->driver->queue_iso(ctx, packet, payload);
return card->driver->queue_iso(ctx, packet, buffer, payload);
}
EXPORT_SYMBOL(fw_iso_context_queue);

12
drivers/firewire/fw-ohci.c
View File

@ -1251,14 +1251,16 @@ static void ohci_free_iso_context(struct fw_iso_context *base)
static int
ohci_queue_iso(struct fw_iso_context *base,
struct fw_iso_packet *packet, void *payload)
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload)
{
struct iso_context *ctx = (struct iso_context *)base;
struct fw_ohci *ohci = fw_ohci(ctx->base.card);
struct descriptor *d, *end, *last, *tail, *pd;
struct fw_iso_packet *p;
__le32 *header;
dma_addr_t d_bus;
dma_addr_t d_bus, page_bus;
u32 z, header_z, payload_z, irq;
u32 payload_index, payload_end_index, next_page_index;
int index, page, end_page, i, length, offset;
@ -1267,7 +1269,7 @@ ohci_queue_iso(struct fw_iso_context *base,
* packet, retransmit or terminate.. */
p = packet;
payload_index = payload - ctx->base.buffer;
payload_index = payload;
d = ctx->head_descriptor;
tail = ctx->tail_descriptor;
end = ctx->buffer + ISO_BUFFER_SIZE / sizeof(struct descriptor);
@ -1337,7 +1339,9 @@ ohci_queue_iso(struct fw_iso_context *base,
length =
min(next_page_index, payload_end_index) - payload_index;
pd[i].req_count = cpu_to_le16(length);
pd[i].data_address = cpu_to_le32(ctx->base.pages[page] + offset);
page_bus = page_private(buffer->pages[page]);
pd[i].data_address = cpu_to_le32(page_bus + offset);
payload_index += length;
}

38
drivers/firewire/fw-transaction.h
View File

@ -27,6 +27,7 @@
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/fs.h>
#include <linux/dma-mapping.h>
#define TCODE_WRITE_QUADLET_REQUEST 0
#define TCODE_WRITE_BLOCK_REQUEST 1
@ -336,6 +337,18 @@ struct fw_iso_context;
typedef void (*fw_iso_callback_t) (struct fw_iso_context *context,
int status, u32 cycle, void *data);
/* An iso buffer is just a set of pages mapped for DMA in the
* specified direction. Since the pages are to be used for DMA, they
* are not mapped into the kernel virtual address space. We store the
* DMA address in the page private. The helper function
* fw_iso_buffer_map() will map the pages into a given vma. */
struct fw_iso_buffer {
enum dma_data_direction direction;
struct page **pages;
int page_count;
};
struct fw_iso_context {
struct fw_card *card;
int type;
@ -343,19 +356,24 @@ struct fw_iso_context {
int speed;
fw_iso_callback_t callback;
void *callback_data;
void *buffer;
size_t buffer_size;
dma_addr_t *pages;
int page_count;
};
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_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma);
void
fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
struct fw_iso_context *
fw_iso_context_create(struct fw_card *card, int type,
size_t buffer_size,
fw_iso_callback_t callback,
void *callback_data);
void
fw_iso_context_destroy(struct fw_iso_context *ctx);
@ -365,7 +383,9 @@ fw_iso_context_start(struct fw_iso_context *ctx,
int
fw_iso_context_queue(struct fw_iso_context *ctx,
struct fw_iso_packet *packet, void *payload);
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload);
int
fw_iso_context_send(struct fw_iso_context *ctx,
@ -410,7 +430,9 @@ struct fw_card_driver {
int (*send_iso)(struct fw_iso_context *ctx, s32 cycle);
int (*queue_iso)(struct fw_iso_context *ctx,
struct fw_iso_packet *packet, void *payload);
struct fw_iso_packet *packet,
struct fw_iso_buffer *buffer,
unsigned long payload);
};
int