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Staging: poch: Remove circular buffer header 

Remove the circular buffer header. Which has been superseded by the
ioctl consume interface.

Signed-off-by: Vijay Kumar B <vijaykumar@bravegnu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Vijay Kumar B 2009-09-21 11:23:58 +05:30 committed by Greg Kroah-Hartman
parent dad1740133
commit 92d450336e
3 changed files with 8 additions and 108 deletions
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1
drivers/staging/poch/README
View File

@ -1,7 +1,6 @@
TODO:
- Rx block size is limited to < 2048, hardware bug?
- Group size is limited to < page size, kernel alloc/mmap API issues
- fix/workaround cache issues in circular buffer header
- test whether Tx is transmitting data from provided buffers
- handle device unplug case
- handle temperature above threshold

109
drivers/staging/poch/poch.c
View File

@ -197,9 +197,6 @@ struct channel_info {
/* Contains the header and circular buffer exported to userspace. */
spinlock_t group_offsets_lock;
struct poch_cbuf_header *header;
struct page *header_pg;
unsigned long header_size;
/* Last group consumed by user space. */
unsigned int consumed;
@ -329,14 +326,12 @@ static ssize_t show_mmap_size(struct device *dev,
int len;
unsigned long mmap_size;
unsigned long group_pages;
unsigned long header_pages;
unsigned long total_group_pages;
group_pages = npages(channel->group_size);
header_pages = npages(channel->header_size);
total_group_pages = group_pages * channel->group_count;
mmap_size = (header_pages + total_group_pages) * PAGE_SIZE;
mmap_size = total_group_pages * PAGE_SIZE;
len = sprintf(buf, "%lu\n", mmap_size);
return len;
}
@ -369,10 +364,8 @@ static int poch_channel_alloc_groups(struct channel_info *channel)
{
unsigned long i;
unsigned long group_pages;
unsigned long header_pages;
group_pages = npages(channel->group_size);
header_pages = npages(channel->header_size);
for (i = 0; i < channel->group_count; i++) {
struct poch_group_info *group;
@ -402,8 +395,7 @@ static int poch_channel_alloc_groups(struct channel_info *channel)
* this?
*/
group->dma_addr = page_to_pfn(group->pg) * PAGE_SIZE;
group->user_offset =
(header_pages + (i * group_pages)) * PAGE_SIZE;
group->user_offset = (i * group_pages) * PAGE_SIZE;
printk(KERN_INFO PFX "%ld: user_offset: 0x%lx\n", i,
group->user_offset);
@ -525,56 +517,6 @@ static void channel_dma_init(struct channel_info *channel)
}
static int poch_channel_alloc_header(struct channel_info *channel)
{
struct poch_cbuf_header *header = channel->header;
unsigned long group_offset_size;
unsigned long tot_group_offsets_size;
/* Allocate memory to hold header exported userspace */
group_offset_size = sizeof(header->group_offsets[0]);
tot_group_offsets_size = group_offset_size * channel->group_count;
channel->header_size = sizeof(*header) + tot_group_offsets_size;
channel->header_pg = alloc_pages(GFP_KERNEL | __GFP_ZERO,
get_order(channel->header_size));
if (!channel->header_pg)
return -ENOMEM;
channel->header = page_address(channel->header_pg);
return 0;
}
static void poch_channel_free_header(struct channel_info *channel)
{
unsigned int order;
order = get_order(channel->header_size);
__free_pages(channel->header_pg, order);
}
static void poch_channel_init_header(struct channel_info *channel)
{
int i;
struct poch_group_info *groups;
s32 *group_offsets;
channel->header->group_size_bytes = channel->group_size;
channel->header->group_count = channel->group_count;
spin_lock_init(&channel->group_offsets_lock);
group_offsets = channel->header->group_offsets;
groups = channel->groups;
for (i = 0; i < channel->group_count; i++) {
if (channel->dir == CHANNEL_DIR_RX)
group_offsets[i] = -1;
else
group_offsets[i] = groups[i].user_offset;
}
}
static void __poch_channel_clear_counters(struct channel_info *channel)
{
channel->counters.pll_unlock = 0;
@ -617,12 +559,6 @@ static int poch_channel_init(struct channel_info *channel,
goto out_free_group_info;
}
ret = poch_channel_alloc_header(channel);
if (ret) {
dev_err(dev, "error allocating user space header\n");
goto out_free_groups;
}
channel->fpga_iomem = poch_dev->fpga_iomem;
channel->bridge_iomem = poch_dev->bridge_iomem;
channel->iomem_lock = &poch_dev->iomem_lock;
@ -630,14 +566,8 @@ static int poch_channel_init(struct channel_info *channel,
__poch_channel_clear_counters(channel);
printk(KERN_WARNING "poch_channel_init_header\n");
poch_channel_init_header(channel);
return 0;
out_free_groups:
poch_channel_free_groups(channel);
out_free_group_info:
kfree(channel->groups);
out:
@ -881,7 +811,6 @@ static int poch_release(struct inode *inode, struct file *filp)
}
atomic_dec(&channel->inited);
poch_channel_free_header(channel);
poch_channel_free_groups(channel);
kfree(channel->groups);
atomic_inc(&channel->free);
@ -890,7 +819,7 @@ static int poch_release(struct inode *inode, struct file *filp)
}
/*
* Map the header and the group buffers, to user space.
* Map the the group buffers, to user space.
*/
static int poch_mmap(struct file *filp, struct vm_area_struct *vma)
{
@ -900,7 +829,6 @@ static int poch_mmap(struct file *filp, struct vm_area_struct *vma)
unsigned long size;
unsigned long group_pages;
unsigned long header_pages;
unsigned long total_group_pages;
int pg_num;
@ -917,30 +845,16 @@ static int poch_mmap(struct file *filp, struct vm_area_struct *vma)
}
group_pages = npages(channel->group_size);
header_pages = npages(channel->header_size);
total_group_pages = group_pages * channel->group_count;
size = vma->vm_end - vma->vm_start;
if (size != (header_pages + total_group_pages) * PAGE_SIZE) {
if (size != total_group_pages * PAGE_SIZE) {
printk(KERN_WARNING PFX "required %lu bytes\n", size);
return -EINVAL;
}
start = vma->vm_start;
/* FIXME: Cleanup required on failure? */
pg = channel->header_pg;
for (pg_num = 0; pg_num < header_pages; pg_num++, pg++) {
printk(KERN_DEBUG PFX "page_count: %d\n", page_count(pg));
printk(KERN_DEBUG PFX "%d: header: 0x%lx\n", pg_num, start);
ret = vm_insert_page(vma, start, pg);
if (ret) {
printk(KERN_DEBUG "vm_insert 1 failed at %lx\n", start);
return ret;
}
start += PAGE_SIZE;
}
for (i = 0; i < channel->group_count; i++) {
pg = channel->groups[i].pg;
for (pg_num = 0; pg_num < group_pages; pg_num++, pg++) {
@ -967,20 +881,16 @@ static int poch_mmap(struct file *filp, struct vm_area_struct *vma)
*/
static int poch_channel_available(struct channel_info *channel)
{
int i;
int available = 0;
spin_lock_irq(&channel->group_offsets_lock);
for (i = 0; i < channel->group_count; i++) {
if (channel->header->group_offsets[i] != -1) {
spin_unlock_irq(&channel->group_offsets_lock);
return 1;
}
}
if (channel->consumed != channel->transfer)
available = 1;
spin_unlock_irq(&channel->group_offsets_lock);
return 0;
return available;
}
static unsigned int poch_poll(struct file *filp, poll_table *pt)
@ -1138,7 +1048,6 @@ static void poch_irq_dma(struct channel_info *channel)
long groups_done;
unsigned long i, j;
struct poch_group_info *groups;
s32 *group_offsets;
u32 curr_group_reg;
if (!atomic_read(&channel->inited))
@ -1158,14 +1067,12 @@ static void poch_irq_dma(struct channel_info *channel)
if (groups_done <= 0)
groups_done += channel->group_count;
group_offsets = channel->header->group_offsets;
groups = channel->groups;
spin_lock(&channel->group_offsets_lock);
for (i = 0; i < groups_done; i++) {
j = (prev_transfer + i) % channel->group_count;
group_offsets[j] = groups[j].user_offset;
channel->transfer += 1;
channel->transfer %= channel->group_count;

6
drivers/staging/poch/poch.h
View File

@ -7,12 +7,6 @@
* include/linux for final version.
*
*/
struct poch_cbuf_header {
__s32 group_size_bytes;
__s32 group_count;
__s32 group_offsets[0];
};
struct poch_counters {
__u32 fifo_empty;
__u32 fifo_overflow;