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powerpc/spufs: simplify spufs core dumping
Replace the coredump ->read method with a ->dump method that must call dump_emit itself. That way we avoid a buffer allocation an messing with set_fs() to call into code that is intended to deal with user buffers. For the ->get case we can now use a small on-stack buffer and avoid memory allocations as well. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
Al Viro
parent
6904d3d0cb
commit
5456ffdee6
3 changed files with 113 additions and 172 deletions
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@ -21,22 +21,6 @@
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#include "spufs.h"
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static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
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size_t size, loff_t *off)
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{
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u64 data;
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int ret;
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if (spufs_coredump_read[num].read)
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return spufs_coredump_read[num].read(ctx, buffer, size, off);
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data = spufs_coredump_read[num].get(ctx);
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ret = snprintf(buffer, size, "0x%.16llx", data);
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if (ret >= size)
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return size;
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return ++ret; /* count trailing NULL */
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}
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static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
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{
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int i, sz, total = 0;
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@ -118,58 +102,43 @@ int spufs_coredump_extra_notes_size(void)
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static int spufs_arch_write_note(struct spu_context *ctx, int i,
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struct coredump_params *cprm, int dfd)
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{
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loff_t pos = 0;
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int sz, rc, total = 0;
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const int bufsz = PAGE_SIZE;
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char *name;
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char fullname[80], *buf;
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size_t sz = spufs_coredump_read[i].size;
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char fullname[80];
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struct elf_note en;
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size_t skip;
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size_t ret;
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buf = (void *)get_zeroed_page(GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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name = spufs_coredump_read[i].name;
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sz = spufs_coredump_read[i].size;
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sprintf(fullname, "SPU/%d/%s", dfd, name);
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sprintf(fullname, "SPU/%d/%s", dfd, spufs_coredump_read[i].name);
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en.n_namesz = strlen(fullname) + 1;
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en.n_descsz = sz;
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en.n_type = NT_SPU;
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if (!dump_emit(cprm, &en, sizeof(en)))
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goto Eio;
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return -EIO;
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if (!dump_emit(cprm, fullname, en.n_namesz))
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goto Eio;
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return -EIO;
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if (!dump_align(cprm, 4))
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goto Eio;
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return -EIO;
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do {
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rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
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if (rc > 0) {
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if (!dump_emit(cprm, buf, rc))
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goto Eio;
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total += rc;
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}
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} while (rc == bufsz && total < sz);
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if (spufs_coredump_read[i].dump) {
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ret = spufs_coredump_read[i].dump(ctx, cprm);
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if (ret < 0)
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return ret;
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} else {
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char buf[32];
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if (rc < 0)
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goto out;
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ret = snprintf(buf, sizeof(buf), "0x%.16llx",
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spufs_coredump_read[i].get(ctx));
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if (ret >= sizeof(buf))
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return sizeof(buf);
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skip = roundup(cprm->pos - total + sz, 4) - cprm->pos;
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if (!dump_skip(cprm, skip))
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goto Eio;
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/* count trailing the NULL: */
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if (!dump_emit(cprm, buf, ret + 1))
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return -EIO;
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}
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rc = 0;
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out:
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free_page((unsigned long)buf);
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return rc;
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Eio:
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free_page((unsigned long)buf);
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return -EIO;
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if (!dump_skip(cprm, roundup(cprm->pos - ret + sz, 4) - cprm->pos))
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return -EIO;
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return 0;
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}
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int spufs_coredump_extra_notes_write(struct coredump_params *cprm)
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@ -9,6 +9,7 @@
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#undef DEBUG
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#include <linux/coredump.h>
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#include <linux/fs.h>
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#include <linux/ioctl.h>
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#include <linux/export.h>
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@ -129,6 +130,14 @@ static ssize_t spufs_attr_write(struct file *file, const char __user *buf,
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return ret;
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}
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static ssize_t spufs_dump_emit(struct coredump_params *cprm, void *buf,
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size_t size)
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{
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if (!dump_emit(cprm, buf, size))
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return -EIO;
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return size;
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}
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#define DEFINE_SPUFS_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \
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static int __fops ## _open(struct inode *inode, struct file *file) \
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{ \
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@ -172,12 +181,9 @@ spufs_mem_release(struct inode *inode, struct file *file)
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}
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static ssize_t
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__spufs_mem_read(struct spu_context *ctx, char __user *buffer,
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size_t size, loff_t *pos)
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spufs_mem_dump(struct spu_context *ctx, struct coredump_params *cprm)
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{
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char *local_store = ctx->ops->get_ls(ctx);
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return simple_read_from_buffer(buffer, size, pos, local_store,
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LS_SIZE);
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return spufs_dump_emit(cprm, ctx->ops->get_ls(ctx), LS_SIZE);
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}
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static ssize_t
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@ -190,7 +196,8 @@ spufs_mem_read(struct file *file, char __user *buffer,
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ret = spu_acquire(ctx);
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if (ret)
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return ret;
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ret = __spufs_mem_read(ctx, buffer, size, pos);
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ret = simple_read_from_buffer(buffer, size, pos, ctx->ops->get_ls(ctx),
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LS_SIZE);
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spu_release(ctx);
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return ret;
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@ -459,12 +466,10 @@ spufs_regs_open(struct inode *inode, struct file *file)
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}
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static ssize_t
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__spufs_regs_read(struct spu_context *ctx, char __user *buffer,
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size_t size, loff_t *pos)
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spufs_regs_dump(struct spu_context *ctx, struct coredump_params *cprm)
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{
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struct spu_lscsa *lscsa = ctx->csa.lscsa;
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return simple_read_from_buffer(buffer, size, pos,
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lscsa->gprs, sizeof lscsa->gprs);
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return spufs_dump_emit(cprm, ctx->csa.lscsa->gprs,
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sizeof(ctx->csa.lscsa->gprs));
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}
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static ssize_t
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@ -482,7 +487,8 @@ spufs_regs_read(struct file *file, char __user *buffer,
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ret = spu_acquire_saved(ctx);
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if (ret)
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return ret;
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ret = __spufs_regs_read(ctx, buffer, size, pos);
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ret = simple_read_from_buffer(buffer, size, pos, ctx->csa.lscsa->gprs,
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sizeof(ctx->csa.lscsa->gprs));
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spu_release_saved(ctx);
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return ret;
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}
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@ -517,12 +523,10 @@ static const struct file_operations spufs_regs_fops = {
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};
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static ssize_t
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__spufs_fpcr_read(struct spu_context *ctx, char __user * buffer,
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size_t size, loff_t * pos)
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spufs_fpcr_dump(struct spu_context *ctx, struct coredump_params *cprm)
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{
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struct spu_lscsa *lscsa = ctx->csa.lscsa;
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return simple_read_from_buffer(buffer, size, pos,
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&lscsa->fpcr, sizeof(lscsa->fpcr));
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return spufs_dump_emit(cprm, &ctx->csa.lscsa->fpcr,
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sizeof(ctx->csa.lscsa->fpcr));
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}
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static ssize_t
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@ -535,7 +539,8 @@ spufs_fpcr_read(struct file *file, char __user * buffer,
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ret = spu_acquire_saved(ctx);
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if (ret)
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return ret;
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ret = __spufs_fpcr_read(ctx, buffer, size, pos);
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ret = simple_read_from_buffer(buffer, size, pos, &ctx->csa.lscsa->fpcr,
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sizeof(ctx->csa.lscsa->fpcr));
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spu_release_saved(ctx);
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return ret;
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}
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@ -953,28 +958,26 @@ spufs_signal1_release(struct inode *inode, struct file *file)
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return 0;
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}
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static ssize_t __spufs_signal1_read(struct spu_context *ctx, char __user *buf,
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size_t len, loff_t *pos)
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static ssize_t spufs_signal1_dump(struct spu_context *ctx,
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struct coredump_params *cprm)
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{
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int ret = 0;
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u32 data;
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if (!ctx->csa.spu_chnlcnt_RW[3])
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return 0;
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return spufs_dump_emit(cprm, &ctx->csa.spu_chnldata_RW[3],
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sizeof(ctx->csa.spu_chnldata_RW[3]));
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}
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if (len < 4)
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static ssize_t __spufs_signal1_read(struct spu_context *ctx, char __user *buf,
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size_t len)
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{
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if (len < sizeof(ctx->csa.spu_chnldata_RW[3]))
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return -EINVAL;
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if (ctx->csa.spu_chnlcnt_RW[3]) {
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data = ctx->csa.spu_chnldata_RW[3];
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ret = 4;
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}
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if (!ret)
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goto out;
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if (copy_to_user(buf, &data, 4))
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if (!ctx->csa.spu_chnlcnt_RW[3])
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return 0;
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if (copy_to_user(buf, &ctx->csa.spu_chnldata_RW[3],
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sizeof(ctx->csa.spu_chnldata_RW[3])))
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return -EFAULT;
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out:
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return ret;
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return sizeof(ctx->csa.spu_chnldata_RW[3]);
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}
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static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
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@ -986,7 +989,7 @@ static ssize_t spufs_signal1_read(struct file *file, char __user *buf,
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ret = spu_acquire_saved(ctx);
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if (ret)
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return ret;
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ret = __spufs_signal1_read(ctx, buf, len, pos);
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ret = __spufs_signal1_read(ctx, buf, len);
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spu_release_saved(ctx);
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return ret;
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@ -1090,28 +1093,26 @@ spufs_signal2_release(struct inode *inode, struct file *file)
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return 0;
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}
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static ssize_t __spufs_signal2_read(struct spu_context *ctx, char __user *buf,
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size_t len, loff_t *pos)
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static ssize_t spufs_signal2_dump(struct spu_context *ctx,
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struct coredump_params *cprm)
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{
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int ret = 0;
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u32 data;
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if (!ctx->csa.spu_chnlcnt_RW[4])
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return 0;
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return spufs_dump_emit(cprm, &ctx->csa.spu_chnldata_RW[4],
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sizeof(ctx->csa.spu_chnldata_RW[4]));
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}
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if (len < 4)
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static ssize_t __spufs_signal2_read(struct spu_context *ctx, char __user *buf,
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size_t len)
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{
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if (len < sizeof(ctx->csa.spu_chnldata_RW[4]))
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return -EINVAL;
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if (ctx->csa.spu_chnlcnt_RW[4]) {
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data = ctx->csa.spu_chnldata_RW[4];
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ret = 4;
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}
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if (!ret)
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goto out;
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if (copy_to_user(buf, &data, 4))
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if (!ctx->csa.spu_chnlcnt_RW[4])
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return 0;
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if (copy_to_user(buf, &ctx->csa.spu_chnldata_RW[4],
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sizeof(ctx->csa.spu_chnldata_RW[4])))
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return -EFAULT;
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out:
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return ret;
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return sizeof(ctx->csa.spu_chnldata_RW[4]);
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}
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static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
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@ -1123,7 +1124,7 @@ static ssize_t spufs_signal2_read(struct file *file, char __user *buf,
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ret = spu_acquire_saved(ctx);
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if (ret)
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return ret;
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ret = __spufs_signal2_read(ctx, buf, len, pos);
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ret = __spufs_signal2_read(ctx, buf, len);
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spu_release_saved(ctx);
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return ret;
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@ -1947,18 +1948,13 @@ static const struct file_operations spufs_caps_fops = {
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.release = single_release,
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};
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static ssize_t __spufs_mbox_info_read(struct spu_context *ctx,
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char __user *buf, size_t len, loff_t *pos)
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static ssize_t spufs_mbox_info_dump(struct spu_context *ctx,
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struct coredump_params *cprm)
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{
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u32 data;
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/* EOF if there's no entry in the mbox */
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if (!(ctx->csa.prob.mb_stat_R & 0x0000ff))
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return 0;
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data = ctx->csa.prob.pu_mb_R;
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return simple_read_from_buffer(buf, len, pos, &data, sizeof data);
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return spufs_dump_emit(cprm, &ctx->csa.prob.pu_mb_R,
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sizeof(ctx->csa.prob.pu_mb_R));
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}
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static ssize_t spufs_mbox_info_read(struct file *file, char __user *buf,
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@ -1990,18 +1986,13 @@ static const struct file_operations spufs_mbox_info_fops = {
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.llseek = generic_file_llseek,
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};
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static ssize_t __spufs_ibox_info_read(struct spu_context *ctx,
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char __user *buf, size_t len, loff_t *pos)
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static ssize_t spufs_ibox_info_dump(struct spu_context *ctx,
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struct coredump_params *cprm)
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{
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u32 data;
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/* EOF if there's no entry in the ibox */
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if (!(ctx->csa.prob.mb_stat_R & 0xff0000))
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return 0;
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data = ctx->csa.priv2.puint_mb_R;
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return simple_read_from_buffer(buf, len, pos, &data, sizeof data);
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return spufs_dump_emit(cprm, &ctx->csa.priv2.puint_mb_R,
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sizeof(ctx->csa.priv2.puint_mb_R));
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}
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static ssize_t spufs_ibox_info_read(struct file *file, char __user *buf,
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@ -2038,21 +2029,11 @@ static size_t spufs_wbox_info_cnt(struct spu_context *ctx)
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return (4 - ((ctx->csa.prob.mb_stat_R & 0x00ff00) >> 8)) * sizeof(u32);
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}
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static ssize_t __spufs_wbox_info_read(struct spu_context *ctx,
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char __user *buf, size_t len, loff_t *pos)
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static ssize_t spufs_wbox_info_dump(struct spu_context *ctx,
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struct coredump_params *cprm)
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{
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int i, cnt;
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u32 data[4];
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u32 wbox_stat;
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wbox_stat = ctx->csa.prob.mb_stat_R;
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cnt = spufs_wbox_info_cnt(ctx);
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for (i = 0; i < cnt; i++) {
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data[i] = ctx->csa.spu_mailbox_data[i];
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}
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return simple_read_from_buffer(buf, len, pos, &data,
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cnt * sizeof(u32));
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return spufs_dump_emit(cprm, &ctx->csa.spu_mailbox_data,
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spufs_wbox_info_cnt(ctx));
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}
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static ssize_t spufs_wbox_info_read(struct file *file, char __user *buf,
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@ -2102,15 +2083,13 @@ static void spufs_get_dma_info(struct spu_context *ctx,
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}
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}
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static ssize_t __spufs_dma_info_read(struct spu_context *ctx,
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char __user *buf, size_t len, loff_t *pos)
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static ssize_t spufs_dma_info_dump(struct spu_context *ctx,
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struct coredump_params *cprm)
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{
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struct spu_dma_info info;
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spufs_get_dma_info(ctx, &info);
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return simple_read_from_buffer(buf, len, pos, &info,
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sizeof info);
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return spufs_dump_emit(cprm, &info, sizeof(info));
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}
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static ssize_t spufs_dma_info_read(struct file *file, char __user *buf,
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@ -2158,22 +2137,13 @@ static void spufs_get_proxydma_info(struct spu_context *ctx,
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}
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}
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|
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static ssize_t __spufs_proxydma_info_read(struct spu_context *ctx,
|
||||
char __user *buf, size_t len, loff_t *pos)
|
||||
static ssize_t spufs_proxydma_info_dump(struct spu_context *ctx,
|
||||
struct coredump_params *cprm)
|
||||
{
|
||||
struct spu_proxydma_info info;
|
||||
int ret = sizeof info;
|
||||
|
||||
if (len < ret)
|
||||
return -EINVAL;
|
||||
|
||||
if (!access_ok(buf, len))
|
||||
return -EFAULT;
|
||||
|
||||
spufs_get_proxydma_info(ctx, &info);
|
||||
|
||||
return simple_read_from_buffer(buf, len, pos, &info,
|
||||
sizeof info);
|
||||
return spufs_dump_emit(cprm, &info, sizeof(info));
|
||||
}
|
||||
|
||||
static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
|
||||
|
|
@ -2183,6 +2153,9 @@ static ssize_t spufs_proxydma_info_read(struct file *file, char __user *buf,
|
|||
struct spu_proxydma_info info;
|
||||
int ret;
|
||||
|
||||
if (len < sizeof(info))
|
||||
return -EINVAL;
|
||||
|
||||
ret = spu_acquire_saved(ctx);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
|
@ -2636,23 +2609,23 @@ const struct spufs_tree_descr spufs_dir_debug_contents[] = {
|
|||
};
|
||||
|
||||
const struct spufs_coredump_reader spufs_coredump_read[] = {
|
||||
{ "regs", __spufs_regs_read, NULL, sizeof(struct spu_reg128[128])},
|
||||
{ "fpcr", __spufs_fpcr_read, NULL, sizeof(struct spu_reg128) },
|
||||
{ "regs", spufs_regs_dump, NULL, sizeof(struct spu_reg128[128])},
|
||||
{ "fpcr", spufs_fpcr_dump, NULL, sizeof(struct spu_reg128) },
|
||||
{ "lslr", NULL, spufs_lslr_get, 19 },
|
||||
{ "decr", NULL, spufs_decr_get, 19 },
|
||||
{ "decr_status", NULL, spufs_decr_status_get, 19 },
|
||||
{ "mem", __spufs_mem_read, NULL, LS_SIZE, },
|
||||
{ "signal1", __spufs_signal1_read, NULL, sizeof(u32) },
|
||||
{ "mem", spufs_mem_dump, NULL, LS_SIZE, },
|
||||
{ "signal1", spufs_signal1_dump, NULL, sizeof(u32) },
|
||||
{ "signal1_type", NULL, spufs_signal1_type_get, 19 },
|
||||
{ "signal2", __spufs_signal2_read, NULL, sizeof(u32) },
|
||||
{ "signal2", spufs_signal2_dump, NULL, sizeof(u32) },
|
||||
{ "signal2_type", NULL, spufs_signal2_type_get, 19 },
|
||||
{ "event_mask", NULL, spufs_event_mask_get, 19 },
|
||||
{ "event_status", NULL, spufs_event_status_get, 19 },
|
||||
{ "mbox_info", __spufs_mbox_info_read, NULL, sizeof(u32) },
|
||||
{ "ibox_info", __spufs_ibox_info_read, NULL, sizeof(u32) },
|
||||
{ "wbox_info", __spufs_wbox_info_read, NULL, 4 * sizeof(u32)},
|
||||
{ "dma_info", __spufs_dma_info_read, NULL, sizeof(struct spu_dma_info)},
|
||||
{ "proxydma_info", __spufs_proxydma_info_read,
|
||||
{ "mbox_info", spufs_mbox_info_dump, NULL, sizeof(u32) },
|
||||
{ "ibox_info", spufs_ibox_info_dump, NULL, sizeof(u32) },
|
||||
{ "wbox_info", spufs_wbox_info_dump, NULL, 4 * sizeof(u32)},
|
||||
{ "dma_info", spufs_dma_info_dump, NULL, sizeof(struct spu_dma_info)},
|
||||
{ "proxydma_info", spufs_proxydma_info_dump,
|
||||
NULL, sizeof(struct spu_proxydma_info)},
|
||||
{ "object-id", NULL, spufs_object_id_get, 19 },
|
||||
{ "npc", NULL, spufs_npc_get, 19 },
|
||||
|
|
|
|||
|
|
@ -337,8 +337,7 @@ void spufs_dma_callback(struct spu *spu, int type);
|
|||
extern struct spu_coredump_calls spufs_coredump_calls;
|
||||
struct spufs_coredump_reader {
|
||||
char *name;
|
||||
ssize_t (*read)(struct spu_context *ctx,
|
||||
char __user *buffer, size_t size, loff_t *pos);
|
||||
ssize_t (*dump)(struct spu_context *ctx, struct coredump_params *cprm);
|
||||
u64 (*get)(struct spu_context *ctx);
|
||||
size_t size;
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in a new issue