linux/arch/powerpc/platforms/cell/spufs/file.c

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/*
* SPU file system -- file contents
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#undef DEBUG
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/poll.h>
#include <linux/ptrace.h>
#include <asm/io.h>
#include <asm/semaphore.h>
#include <asm/spu.h>
#include <asm/uaccess.h>
#include "spufs.h"
static int
spufs_mem_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
struct spu_context *ctx = i->i_ctx;
file->private_data = ctx;
file->f_mapping = inode->i_mapping;
ctx->local_store = inode->i_mapping;
return 0;
}
static ssize_t
spufs_mem_read(struct file *file, char __user *buffer,
size_t size, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
char *local_store;
int ret;
spu_acquire(ctx);
local_store = ctx->ops->get_ls(ctx);
ret = simple_read_from_buffer(buffer, size, pos, local_store, LS_SIZE);
spu_release(ctx);
return ret;
}
static ssize_t
spufs_mem_write(struct file *file, const char __user *buffer,
size_t size, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
char *local_store;
int ret;
size = min_t(ssize_t, LS_SIZE - *pos, size);
if (size <= 0)
return -EFBIG;
*pos += size;
spu_acquire(ctx);
local_store = ctx->ops->get_ls(ctx);
ret = copy_from_user(local_store + *pos - size,
buffer, size) ? -EFAULT : size;
spu_release(ctx);
return ret;
}
#ifdef CONFIG_SPUFS_MMAP
static struct page *
spufs_mem_mmap_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
struct page *page = NOPAGE_SIGBUS;
struct spu_context *ctx = vma->vm_file->private_data;
unsigned long offset = address - vma->vm_start;
offset += vma->vm_pgoff << PAGE_SHIFT;
spu_acquire(ctx);
if (ctx->state == SPU_STATE_SAVED)
page = vmalloc_to_page(ctx->csa.lscsa->ls + offset);
else
page = pfn_to_page((ctx->spu->local_store_phys + offset)
>> PAGE_SHIFT);
spu_release(ctx);
if (type)
*type = VM_FAULT_MINOR;
page_cache_get(page);
return page;
}
static struct vm_operations_struct spufs_mem_mmap_vmops = {
.nopage = spufs_mem_mmap_nopage,
};
static int
spufs_mem_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
/* FIXME: */
vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
| _PAGE_NO_CACHE);
vma->vm_ops = &spufs_mem_mmap_vmops;
return 0;
}
#endif
static struct file_operations spufs_mem_fops = {
.open = spufs_mem_open,
.read = spufs_mem_read,
.write = spufs_mem_write,
.llseek = generic_file_llseek,
#ifdef CONFIG_SPUFS_MMAP
.mmap = spufs_mem_mmap,
#endif
};
#ifdef CONFIG_SPUFS_MMAP
static struct page *spufs_ps_nopage(struct vm_area_struct *vma,
unsigned long address,
int *type, unsigned long ps_offs)
{
struct page *page = NOPAGE_SIGBUS;
int fault_type = VM_FAULT_SIGBUS;
struct spu_context *ctx = vma->vm_file->private_data;
unsigned long offset = address - vma->vm_start;
unsigned long area;
int ret;
offset += vma->vm_pgoff << PAGE_SHIFT;
if (offset >= 0x4000)
goto out;
ret = spu_acquire_runnable(ctx);
if (ret)
goto out;
area = ctx->spu->problem_phys + ps_offs;
page = pfn_to_page((area + offset) >> PAGE_SHIFT);
fault_type = VM_FAULT_MINOR;
page_cache_get(page);
spu_release(ctx);
out:
if (type)
*type = fault_type;
return page;
}
static struct page *spufs_cntl_mmap_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
return spufs_ps_nopage(vma, address, type, 0x4000);
}
static struct vm_operations_struct spufs_cntl_mmap_vmops = {
.nopage = spufs_cntl_mmap_nopage,
};
/*
* mmap support for problem state control area [0x4000 - 0x4fff].
* Mapping this area requires that the application have CAP_SYS_RAWIO,
* as these registers require special care when read/writing.
*/
static int spufs_cntl_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
vma->vm_flags |= VM_RESERVED;
vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
| _PAGE_NO_CACHE | _PAGE_GUARDED);
vma->vm_ops = &spufs_cntl_mmap_vmops;
return 0;
}
#endif
static int spufs_cntl_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
struct spu_context *ctx = i->i_ctx;
file->private_data = ctx;
file->f_mapping = inode->i_mapping;
ctx->cntl = inode->i_mapping;
return 0;
}
static ssize_t
spufs_cntl_read(struct file *file, char __user *buffer,
size_t size, loff_t *pos)
{
/* FIXME: read from spu status */
return -EINVAL;
}
static ssize_t
spufs_cntl_write(struct file *file, const char __user *buffer,
size_t size, loff_t *pos)
{
/* FIXME: write to runctl bit */
return -EINVAL;
}
static struct file_operations spufs_cntl_fops = {
.open = spufs_cntl_open,
.read = spufs_cntl_read,
.write = spufs_cntl_write,
#ifdef CONFIG_SPUFS_MMAP
.mmap = spufs_cntl_mmap,
#endif
};
static int
spufs_regs_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
file->private_data = i->i_ctx;
return 0;
}
static ssize_t
spufs_regs_read(struct file *file, char __user *buffer,
size_t size, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
int ret;
spu_acquire_saved(ctx);
ret = simple_read_from_buffer(buffer, size, pos,
lscsa->gprs, sizeof lscsa->gprs);
spu_release(ctx);
return ret;
}
static ssize_t
spufs_regs_write(struct file *file, const char __user *buffer,
size_t size, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
int ret;
size = min_t(ssize_t, sizeof lscsa->gprs - *pos, size);
if (size <= 0)
return -EFBIG;
*pos += size;
spu_acquire_saved(ctx);
ret = copy_from_user(lscsa->gprs + *pos - size,
buffer, size) ? -EFAULT : size;
spu_release(ctx);
return ret;
}
static struct file_operations spufs_regs_fops = {
.open = spufs_regs_open,
.read = spufs_regs_read,
.write = spufs_regs_write,
.llseek = generic_file_llseek,
};
static ssize_t
spufs_fpcr_read(struct file *file, char __user * buffer,
size_t size, loff_t * pos)
{
struct spu_context *ctx = file->private_data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
int ret;
spu_acquire_saved(ctx);
ret = simple_read_from_buffer(buffer, size, pos,
&lscsa->fpcr, sizeof(lscsa->fpcr));
spu_release(ctx);
return ret;
}
static ssize_t
spufs_fpcr_write(struct file *file, const char __user * buffer,
size_t size, loff_t * pos)
{
struct spu_context *ctx = file->private_data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
int ret;
size = min_t(ssize_t, sizeof(lscsa->fpcr) - *pos, size);
if (size <= 0)
return -EFBIG;
*pos += size;
spu_acquire_saved(ctx);
ret = copy_from_user((char *)&lscsa->fpcr + *pos - size,
buffer, size) ? -EFAULT : size;
spu_release(ctx);
return ret;
}
static struct file_operations spufs_fpcr_fops = {
.open = spufs_regs_open,
.read = spufs_fpcr_read,
.write = spufs_fpcr_write,
.llseek = generic_file_llseek,
};
/* generic open function for all pipe-like files */
static int spufs_pipe_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
file->private_data = i->i_ctx;
return nonseekable_open(inode, file);
}
static ssize_t spufs_mbox_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
u32 mbox_data;
int ret;
if (len < 4)
return -EINVAL;
spu_acquire(ctx);
ret = ctx->ops->mbox_read(ctx, &mbox_data);
spu_release(ctx);
if (!ret)
return -EAGAIN;
if (copy_to_user(buf, &mbox_data, sizeof mbox_data))
return -EFAULT;
return 4;
}
static struct file_operations spufs_mbox_fops = {
.open = spufs_pipe_open,
.read = spufs_mbox_read,
};
static ssize_t spufs_mbox_stat_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
u32 mbox_stat;
if (len < 4)
return -EINVAL;
spu_acquire(ctx);
mbox_stat = ctx->ops->mbox_stat_read(ctx) & 0xff;
spu_release(ctx);
if (copy_to_user(buf, &mbox_stat, sizeof mbox_stat))
return -EFAULT;
return 4;
}
static struct file_operations spufs_mbox_stat_fops = {
.open = spufs_pipe_open,
.read = spufs_mbox_stat_read,
};
/* low-level ibox access function */
size_t spu_ibox_read(struct spu_context *ctx, u32 *data)
{
return ctx->ops->ibox_read(ctx, data);
}
static int spufs_ibox_fasync(int fd, struct file *file, int on)
{
struct spu_context *ctx = file->private_data;
return fasync_helper(fd, file, on, &ctx->ibox_fasync);
}
/* interrupt-level ibox callback function. */
void spufs_ibox_callback(struct spu *spu)
{
struct spu_context *ctx = spu->ctx;
wake_up_all(&ctx->ibox_wq);
kill_fasync(&ctx->ibox_fasync, SIGIO, POLLIN);
}
static ssize_t spufs_ibox_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
u32 ibox_data;
ssize_t ret;
if (len < 4)
return -EINVAL;
spu_acquire(ctx);
ret = 0;
if (file->f_flags & O_NONBLOCK) {
if (!spu_ibox_read(ctx, &ibox_data))
ret = -EAGAIN;
} else {
ret = spufs_wait(ctx->ibox_wq, spu_ibox_read(ctx, &ibox_data));
}
spu_release(ctx);
if (ret)
return ret;
ret = 4;
if (copy_to_user(buf, &ibox_data, sizeof ibox_data))
ret = -EFAULT;
return ret;
}
static unsigned int spufs_ibox_poll(struct file *file, poll_table *wait)
{
struct spu_context *ctx = file->private_data;
unsigned int mask;
poll_wait(file, &ctx->ibox_wq, wait);
spu_acquire(ctx);
mask = ctx->ops->mbox_stat_poll(ctx, POLLIN | POLLRDNORM);
spu_release(ctx);
return mask;
}
static struct file_operations spufs_ibox_fops = {
.open = spufs_pipe_open,
.read = spufs_ibox_read,
.poll = spufs_ibox_poll,
.fasync = spufs_ibox_fasync,
};
static ssize_t spufs_ibox_stat_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
u32 ibox_stat;
if (len < 4)
return -EINVAL;
spu_acquire(ctx);
ibox_stat = (ctx->ops->mbox_stat_read(ctx) >> 16) & 0xff;
spu_release(ctx);
if (copy_to_user(buf, &ibox_stat, sizeof ibox_stat))
return -EFAULT;
return 4;
}
static struct file_operations spufs_ibox_stat_fops = {
.open = spufs_pipe_open,
.read = spufs_ibox_stat_read,
};
/* low-level mailbox write */
size_t spu_wbox_write(struct spu_context *ctx, u32 data)
{
return ctx->ops->wbox_write(ctx, data);
}
static int spufs_wbox_fasync(int fd, struct file *file, int on)
{
struct spu_context *ctx = file->private_data;
int ret;
ret = fasync_helper(fd, file, on, &ctx->wbox_fasync);
return ret;
}
/* interrupt-level wbox callback function. */
void spufs_wbox_callback(struct spu *spu)
{
struct spu_context *ctx = spu->ctx;
wake_up_all(&ctx->wbox_wq);
kill_fasync(&ctx->wbox_fasync, SIGIO, POLLOUT);
}
static ssize_t spufs_wbox_write(struct file *file, const char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
u32 wbox_data;
int ret;
if (len < 4)
return -EINVAL;
if (copy_from_user(&wbox_data, buf, sizeof wbox_data))
return -EFAULT;
spu_acquire(ctx);
ret = 0;
if (file->f_flags & O_NONBLOCK) {
if (!spu_wbox_write(ctx, wbox_data))
ret = -EAGAIN;
} else {
ret = spufs_wait(ctx->wbox_wq, spu_wbox_write(ctx, wbox_data));
}
spu_release(ctx);
return ret ? ret : sizeof wbox_data;
}
static unsigned int spufs_wbox_poll(struct file *file, poll_table *wait)
{
struct spu_context *ctx = file->private_data;
unsigned int mask;
poll_wait(file, &ctx->wbox_wq, wait);
spu_acquire(ctx);
mask = ctx->ops->mbox_stat_poll(ctx, POLLOUT | POLLWRNORM);
spu_release(ctx);
return mask;
}
static struct file_operations spufs_wbox_fops = {
.open = spufs_pipe_open,
.write = spufs_wbox_write,
.poll = spufs_wbox_poll,
.fasync = spufs_wbox_fasync,
};
static ssize_t spufs_wbox_stat_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
u32 wbox_stat;
if (len < 4)
return -EINVAL;
spu_acquire(ctx);
wbox_stat = (ctx->ops->mbox_stat_read(ctx) >> 8) & 0xff;
spu_release(ctx);
if (copy_to_user(buf, &wbox_stat, sizeof wbox_stat))
return -EFAULT;
return 4;
}
static struct file_operations spufs_wbox_stat_fops = {
.open = spufs_pipe_open,
.read = spufs_wbox_stat_read,
};
static int spufs_signal1_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
struct spu_context *ctx = i->i_ctx;
file->private_data = ctx;
file->f_mapping = inode->i_mapping;
ctx->signal1 = inode->i_mapping;
return nonseekable_open(inode, file);
}
static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
u32 data;
if (len < 4)
return -EINVAL;
spu_acquire(ctx);
data = ctx->ops->signal1_read(ctx);
spu_release(ctx);
if (copy_to_user(buf, &data, 4))
return -EFAULT;
return 4;
}
static ssize_t spufs_signal1_write(struct file *file, const char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx;
u32 data;
ctx = file->private_data;
if (len < 4)
return -EINVAL;
if (copy_from_user(&data, buf, 4))
return -EFAULT;
spu_acquire(ctx);
ctx->ops->signal1_write(ctx, data);
spu_release(ctx);
return 4;
}
#ifdef CONFIG_SPUFS_MMAP
static struct page *spufs_signal1_mmap_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
return spufs_ps_nopage(vma, address, type, 0x14000);
}
static struct vm_operations_struct spufs_signal1_mmap_vmops = {
.nopage = spufs_signal1_mmap_nopage,
};
static int spufs_signal1_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
vma->vm_flags |= VM_RESERVED;
vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
| _PAGE_NO_CACHE | _PAGE_GUARDED);
vma->vm_ops = &spufs_signal1_mmap_vmops;
return 0;
}
#endif
static struct file_operations spufs_signal1_fops = {
.open = spufs_signal1_open,
.read = spufs_signal1_read,
.write = spufs_signal1_write,
#ifdef CONFIG_SPUFS_MMAP
.mmap = spufs_signal1_mmap,
#endif
};
static int spufs_signal2_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
struct spu_context *ctx = i->i_ctx;
file->private_data = ctx;
file->f_mapping = inode->i_mapping;
ctx->signal2 = inode->i_mapping;
return nonseekable_open(inode, file);
}
static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx;
u32 data;
ctx = file->private_data;
if (len < 4)
return -EINVAL;
spu_acquire(ctx);
data = ctx->ops->signal2_read(ctx);
spu_release(ctx);
if (copy_to_user(buf, &data, 4))
return -EFAULT;
return 4;
}
static ssize_t spufs_signal2_write(struct file *file, const char __user *buf,
size_t len, loff_t *pos)
{
struct spu_context *ctx;
u32 data;
ctx = file->private_data;
if (len < 4)
return -EINVAL;
if (copy_from_user(&data, buf, 4))
return -EFAULT;
spu_acquire(ctx);
ctx->ops->signal2_write(ctx, data);
spu_release(ctx);
return 4;
}
#ifdef CONFIG_SPUFS_MMAP
static struct page *spufs_signal2_mmap_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
return spufs_ps_nopage(vma, address, type, 0x1c000);
}
static struct vm_operations_struct spufs_signal2_mmap_vmops = {
.nopage = spufs_signal2_mmap_nopage,
};
static int spufs_signal2_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
/* FIXME: */
vma->vm_flags |= VM_RESERVED;
vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
| _PAGE_NO_CACHE | _PAGE_GUARDED);
vma->vm_ops = &spufs_signal2_mmap_vmops;
return 0;
}
#endif
static struct file_operations spufs_signal2_fops = {
.open = spufs_signal2_open,
.read = spufs_signal2_read,
.write = spufs_signal2_write,
#ifdef CONFIG_SPUFS_MMAP
.mmap = spufs_signal2_mmap,
#endif
};
static void spufs_signal1_type_set(void *data, u64 val)
{
struct spu_context *ctx = data;
spu_acquire(ctx);
ctx->ops->signal1_type_set(ctx, val);
spu_release(ctx);
}
static u64 spufs_signal1_type_get(void *data)
{
struct spu_context *ctx = data;
u64 ret;
spu_acquire(ctx);
ret = ctx->ops->signal1_type_get(ctx);
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_signal1_type, spufs_signal1_type_get,
spufs_signal1_type_set, "%llu");
static void spufs_signal2_type_set(void *data, u64 val)
{
struct spu_context *ctx = data;
spu_acquire(ctx);
ctx->ops->signal2_type_set(ctx, val);
spu_release(ctx);
}
static u64 spufs_signal2_type_get(void *data)
{
struct spu_context *ctx = data;
u64 ret;
spu_acquire(ctx);
ret = ctx->ops->signal2_type_get(ctx);
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_signal2_type, spufs_signal2_type_get,
spufs_signal2_type_set, "%llu");
#ifdef CONFIG_SPUFS_MMAP
static struct page *spufs_mss_mmap_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
return spufs_ps_nopage(vma, address, type, 0x0000);
}
static struct vm_operations_struct spufs_mss_mmap_vmops = {
.nopage = spufs_mss_mmap_nopage,
};
/*
* mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
* Mapping this area requires that the application have CAP_SYS_RAWIO,
* as these registers require special care when read/writing.
*/
static int spufs_mss_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
vma->vm_flags |= VM_RESERVED;
vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
| _PAGE_NO_CACHE | _PAGE_GUARDED);
vma->vm_ops = &spufs_mss_mmap_vmops;
return 0;
}
#endif
static int spufs_mss_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
file->private_data = i->i_ctx;
return nonseekable_open(inode, file);
}
static struct file_operations spufs_mss_fops = {
.open = spufs_mss_open,
#ifdef CONFIG_SPUFS_MMAP
.mmap = spufs_mss_mmap,
#endif
};
#ifdef CONFIG_SPUFS_MMAP
static struct page *spufs_mfc_mmap_nopage(struct vm_area_struct *vma,
unsigned long address, int *type)
{
return spufs_ps_nopage(vma, address, type, 0x3000);
}
static struct vm_operations_struct spufs_mfc_mmap_vmops = {
.nopage = spufs_mfc_mmap_nopage,
};
/*
* mmap support for problem state MFC DMA area [0x0000 - 0x0fff].
* Mapping this area requires that the application have CAP_SYS_RAWIO,
* as these registers require special care when read/writing.
*/
static int spufs_mfc_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
vma->vm_flags |= VM_RESERVED;
vma->vm_page_prot = __pgprot(pgprot_val(vma->vm_page_prot)
| _PAGE_NO_CACHE | _PAGE_GUARDED);
vma->vm_ops = &spufs_mfc_mmap_vmops;
return 0;
}
#endif
static int spufs_mfc_open(struct inode *inode, struct file *file)
{
struct spufs_inode_info *i = SPUFS_I(inode);
struct spu_context *ctx = i->i_ctx;
/* we don't want to deal with DMA into other processes */
if (ctx->owner != current->mm)
return -EINVAL;
if (atomic_read(&inode->i_count) != 1)
return -EBUSY;
file->private_data = ctx;
return nonseekable_open(inode, file);
}
/* interrupt-level mfc callback function. */
void spufs_mfc_callback(struct spu *spu)
{
struct spu_context *ctx = spu->ctx;
wake_up_all(&ctx->mfc_wq);
pr_debug("%s %s\n", __FUNCTION__, spu->name);
if (ctx->mfc_fasync) {
u32 free_elements, tagstatus;
unsigned int mask;
/* no need for spu_acquire in interrupt context */
free_elements = ctx->ops->get_mfc_free_elements(ctx);
tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
mask = 0;
if (free_elements & 0xffff)
mask |= POLLOUT;
if (tagstatus & ctx->tagwait)
mask |= POLLIN;
kill_fasync(&ctx->mfc_fasync, SIGIO, mask);
}
}
static int spufs_read_mfc_tagstatus(struct spu_context *ctx, u32 *status)
{
/* See if there is one tag group is complete */
/* FIXME we need locking around tagwait */
*status = ctx->ops->read_mfc_tagstatus(ctx) & ctx->tagwait;
ctx->tagwait &= ~*status;
if (*status)
return 1;
/* enable interrupt waiting for any tag group,
may silently fail if interrupts are already enabled */
ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
return 0;
}
static ssize_t spufs_mfc_read(struct file *file, char __user *buffer,
size_t size, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
int ret = -EINVAL;
u32 status;
if (size != 4)
goto out;
spu_acquire(ctx);
if (file->f_flags & O_NONBLOCK) {
status = ctx->ops->read_mfc_tagstatus(ctx);
if (!(status & ctx->tagwait))
ret = -EAGAIN;
else
ctx->tagwait &= ~status;
} else {
ret = spufs_wait(ctx->mfc_wq,
spufs_read_mfc_tagstatus(ctx, &status));
}
spu_release(ctx);
if (ret)
goto out;
ret = 4;
if (copy_to_user(buffer, &status, 4))
ret = -EFAULT;
out:
return ret;
}
static int spufs_check_valid_dma(struct mfc_dma_command *cmd)
{
pr_debug("queueing DMA %x %lx %x %x %x\n", cmd->lsa,
cmd->ea, cmd->size, cmd->tag, cmd->cmd);
switch (cmd->cmd) {
case MFC_PUT_CMD:
case MFC_PUTF_CMD:
case MFC_PUTB_CMD:
case MFC_GET_CMD:
case MFC_GETF_CMD:
case MFC_GETB_CMD:
break;
default:
pr_debug("invalid DMA opcode %x\n", cmd->cmd);
return -EIO;
}
if ((cmd->lsa & 0xf) != (cmd->ea &0xf)) {
pr_debug("invalid DMA alignment, ea %lx lsa %x\n",
cmd->ea, cmd->lsa);
return -EIO;
}
switch (cmd->size & 0xf) {
case 1:
break;
case 2:
if (cmd->lsa & 1)
goto error;
break;
case 4:
if (cmd->lsa & 3)
goto error;
break;
case 8:
if (cmd->lsa & 7)
goto error;
break;
case 0:
if (cmd->lsa & 15)
goto error;
break;
error:
default:
pr_debug("invalid DMA alignment %x for size %x\n",
cmd->lsa & 0xf, cmd->size);
return -EIO;
}
if (cmd->size > 16 * 1024) {
pr_debug("invalid DMA size %x\n", cmd->size);
return -EIO;
}
if (cmd->tag & 0xfff0) {
/* we reserve the higher tag numbers for kernel use */
pr_debug("invalid DMA tag\n");
return -EIO;
}
if (cmd->class) {
/* not supported in this version */
pr_debug("invalid DMA class\n");
return -EIO;
}
return 0;
}
static int spu_send_mfc_command(struct spu_context *ctx,
struct mfc_dma_command cmd,
int *error)
{
*error = ctx->ops->send_mfc_command(ctx, &cmd);
if (*error == -EAGAIN) {
/* wait for any tag group to complete
so we have space for the new command */
ctx->ops->set_mfc_query(ctx, ctx->tagwait, 1);
/* try again, because the queue might be
empty again */
*error = ctx->ops->send_mfc_command(ctx, &cmd);
if (*error == -EAGAIN)
return 0;
}
return 1;
}
static ssize_t spufs_mfc_write(struct file *file, const char __user *buffer,
size_t size, loff_t *pos)
{
struct spu_context *ctx = file->private_data;
struct mfc_dma_command cmd;
int ret = -EINVAL;
if (size != sizeof cmd)
goto out;
ret = -EFAULT;
if (copy_from_user(&cmd, buffer, sizeof cmd))
goto out;
ret = spufs_check_valid_dma(&cmd);
if (ret)
goto out;
spu_acquire_runnable(ctx);
if (file->f_flags & O_NONBLOCK) {
ret = ctx->ops->send_mfc_command(ctx, &cmd);
} else {
int status;
ret = spufs_wait(ctx->mfc_wq,
spu_send_mfc_command(ctx, cmd, &status));
if (status)
ret = status;
}
spu_release(ctx);
if (ret)
goto out;
ctx->tagwait |= 1 << cmd.tag;
out:
return ret;
}
static unsigned int spufs_mfc_poll(struct file *file,poll_table *wait)
{
struct spu_context *ctx = file->private_data;
u32 free_elements, tagstatus;
unsigned int mask;
spu_acquire(ctx);
ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2);
free_elements = ctx->ops->get_mfc_free_elements(ctx);
tagstatus = ctx->ops->read_mfc_tagstatus(ctx);
spu_release(ctx);
poll_wait(file, &ctx->mfc_wq, wait);
mask = 0;
if (free_elements & 0xffff)
mask |= POLLOUT | POLLWRNORM;
if (tagstatus & ctx->tagwait)
mask |= POLLIN | POLLRDNORM;
pr_debug("%s: free %d tagstatus %d tagwait %d\n", __FUNCTION__,
free_elements, tagstatus, ctx->tagwait);
return mask;
}
static int spufs_mfc_flush(struct file *file, fl_owner_t id)
{
struct spu_context *ctx = file->private_data;
int ret;
spu_acquire(ctx);
#if 0
/* this currently hangs */
ret = spufs_wait(ctx->mfc_wq,
ctx->ops->set_mfc_query(ctx, ctx->tagwait, 2));
if (ret)
goto out;
ret = spufs_wait(ctx->mfc_wq,
ctx->ops->read_mfc_tagstatus(ctx) == ctx->tagwait);
out:
#else
ret = 0;
#endif
spu_release(ctx);
return ret;
}
static int spufs_mfc_fsync(struct file *file, struct dentry *dentry,
int datasync)
{
return spufs_mfc_flush(file, NULL);
}
static int spufs_mfc_fasync(int fd, struct file *file, int on)
{
struct spu_context *ctx = file->private_data;
return fasync_helper(fd, file, on, &ctx->mfc_fasync);
}
static struct file_operations spufs_mfc_fops = {
.open = spufs_mfc_open,
.read = spufs_mfc_read,
.write = spufs_mfc_write,
.poll = spufs_mfc_poll,
.flush = spufs_mfc_flush,
.fsync = spufs_mfc_fsync,
.fasync = spufs_mfc_fasync,
#ifdef CONFIG_SPUFS_MMAP
.mmap = spufs_mfc_mmap,
#endif
};
static void spufs_npc_set(void *data, u64 val)
{
struct spu_context *ctx = data;
spu_acquire(ctx);
ctx->ops->npc_write(ctx, val);
spu_release(ctx);
}
static u64 spufs_npc_get(void *data)
{
struct spu_context *ctx = data;
u64 ret;
spu_acquire(ctx);
ret = ctx->ops->npc_read(ctx);
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_npc_ops, spufs_npc_get, spufs_npc_set, "%llx\n")
static void spufs_decr_set(void *data, u64 val)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
spu_acquire_saved(ctx);
lscsa->decr.slot[0] = (u32) val;
spu_release(ctx);
}
static u64 spufs_decr_get(void *data)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
u64 ret;
spu_acquire_saved(ctx);
ret = lscsa->decr.slot[0];
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_decr_ops, spufs_decr_get, spufs_decr_set,
"%llx\n")
static void spufs_decr_status_set(void *data, u64 val)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
spu_acquire_saved(ctx);
lscsa->decr_status.slot[0] = (u32) val;
spu_release(ctx);
}
static u64 spufs_decr_status_get(void *data)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
u64 ret;
spu_acquire_saved(ctx);
ret = lscsa->decr_status.slot[0];
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_decr_status_ops, spufs_decr_status_get,
spufs_decr_status_set, "%llx\n")
static void spufs_spu_tag_mask_set(void *data, u64 val)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
spu_acquire_saved(ctx);
lscsa->tag_mask.slot[0] = (u32) val;
spu_release(ctx);
}
static u64 spufs_spu_tag_mask_get(void *data)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
u64 ret;
spu_acquire_saved(ctx);
ret = lscsa->tag_mask.slot[0];
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_spu_tag_mask_ops, spufs_spu_tag_mask_get,
spufs_spu_tag_mask_set, "%llx\n")
static void spufs_event_mask_set(void *data, u64 val)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
spu_acquire_saved(ctx);
lscsa->event_mask.slot[0] = (u32) val;
spu_release(ctx);
}
static u64 spufs_event_mask_get(void *data)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
u64 ret;
spu_acquire_saved(ctx);
ret = lscsa->event_mask.slot[0];
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_event_mask_ops, spufs_event_mask_get,
spufs_event_mask_set, "%llx\n")
static void spufs_srr0_set(void *data, u64 val)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
spu_acquire_saved(ctx);
lscsa->srr0.slot[0] = (u32) val;
spu_release(ctx);
}
static u64 spufs_srr0_get(void *data)
{
struct spu_context *ctx = data;
struct spu_lscsa *lscsa = ctx->csa.lscsa;
u64 ret;
spu_acquire_saved(ctx);
ret = lscsa->srr0.slot[0];
spu_release(ctx);
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_srr0_ops, spufs_srr0_get, spufs_srr0_set,
"%llx\n")
static u64 spufs_id_get(void *data)
{
struct spu_context *ctx = data;
u64 num;
spu_acquire(ctx);
if (ctx->state == SPU_STATE_RUNNABLE)
num = ctx->spu->number;
else
num = (unsigned int)-1;
spu_release(ctx);
return num;
}
DEFINE_SIMPLE_ATTRIBUTE(spufs_id_ops, spufs_id_get, NULL, "0x%llx\n")
struct tree_descr spufs_dir_contents[] = {
{ "mem", &spufs_mem_fops, 0666, },
{ "regs", &spufs_regs_fops, 0666, },
{ "mbox", &spufs_mbox_fops, 0444, },
{ "ibox", &spufs_ibox_fops, 0444, },
{ "wbox", &spufs_wbox_fops, 0222, },
{ "mbox_stat", &spufs_mbox_stat_fops, 0444, },
{ "ibox_stat", &spufs_ibox_stat_fops, 0444, },
{ "wbox_stat", &spufs_wbox_stat_fops, 0444, },
{ "signal1", &spufs_signal1_fops, 0666, },
{ "signal2", &spufs_signal2_fops, 0666, },
{ "signal1_type", &spufs_signal1_type, 0666, },
{ "signal2_type", &spufs_signal2_type, 0666, },
{ "mss", &spufs_mss_fops, 0666, },
{ "mfc", &spufs_mfc_fops, 0666, },
{ "cntl", &spufs_cntl_fops, 0666, },
{ "npc", &spufs_npc_ops, 0666, },
{ "fpcr", &spufs_fpcr_fops, 0666, },
{ "decr", &spufs_decr_ops, 0666, },
{ "decr_status", &spufs_decr_status_ops, 0666, },
{ "spu_tag_mask", &spufs_spu_tag_mask_ops, 0666, },
{ "event_mask", &spufs_event_mask_ops, 0666, },
{ "srr0", &spufs_srr0_ops, 0666, },
{ "phys-id", &spufs_id_ops, 0666, },
{},
};