From 08f87f769b595151be1afeff53e144f543faa614 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 06 Dec 2023 09:51:13 +0000
Subject: [PATCH] add dts config
---
kernel/arch/powerpc/platforms/cell/spufs/coredump.c | 113 ++++++++++++++++++++------------------------------------
1 files changed, 41 insertions(+), 72 deletions(-)
diff --git a/kernel/arch/powerpc/platforms/cell/spufs/coredump.c b/kernel/arch/powerpc/platforms/cell/spufs/coredump.c
index 84b7ac9..026c181 100644
--- a/kernel/arch/powerpc/platforms/cell/spufs/coredump.c
+++ b/kernel/arch/powerpc/platforms/cell/spufs/coredump.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SPU core dump code
*
* (C) Copyright 2006 IBM Corp.
*
* Author: Dwayne Grant McConnell <decimal@us.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.
*/
#include <linux/elf.h>
@@ -33,22 +20,6 @@
#include <linux/uaccess.h>
#include "spufs.h"
-
-static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
- size_t size, loff_t *off)
-{
- u64 data;
- int ret;
-
- if (spufs_coredump_read[num].read)
- return spufs_coredump_read[num].read(ctx, buffer, size, off);
-
- data = spufs_coredump_read[num].get(ctx);
- ret = snprintf(buffer, size, "0x%.16llx", data);
- if (ret >= size)
- return size;
- return ++ret; /* count trailing NULL */
-}
static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
{
@@ -95,13 +66,20 @@
*/
static struct spu_context *coredump_next_context(int *fd)
{
+ struct spu_context *ctx;
struct file *file;
int n = iterate_fd(current->files, *fd, match_context, NULL);
if (!n)
return NULL;
*fd = n - 1;
+
+ rcu_read_lock();
file = fcheck(*fd);
- return SPUFS_I(file_inode(file))->i_ctx;
+ ctx = SPUFS_I(file_inode(file))->i_ctx;
+ get_spu_context(ctx);
+ rcu_read_unlock();
+
+ return ctx;
}
int spufs_coredump_extra_notes_size(void)
@@ -112,17 +90,23 @@
fd = 0;
while ((ctx = coredump_next_context(&fd)) != NULL) {
rc = spu_acquire_saved(ctx);
- if (rc)
+ if (rc) {
+ put_spu_context(ctx);
break;
+ }
+
rc = spufs_ctx_note_size(ctx, fd);
spu_release_saved(ctx);
- if (rc < 0)
+ if (rc < 0) {
+ put_spu_context(ctx);
break;
+ }
size += rc;
/* start searching the next fd next time */
fd++;
+ put_spu_context(ctx);
}
return size;
@@ -131,58 +115,43 @@
static int spufs_arch_write_note(struct spu_context *ctx, int i,
struct coredump_params *cprm, int dfd)
{
- loff_t pos = 0;
- int sz, rc, total = 0;
- const int bufsz = PAGE_SIZE;
- char *name;
- char fullname[80], *buf;
+ size_t sz = spufs_coredump_read[i].size;
+ char fullname[80];
struct elf_note en;
- size_t skip;
+ int ret;
- buf = (void *)get_zeroed_page(GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
-
- name = spufs_coredump_read[i].name;
- sz = spufs_coredump_read[i].size;
-
- sprintf(fullname, "SPU/%d/%s", dfd, name);
+ sprintf(fullname, "SPU/%d/%s", dfd, spufs_coredump_read[i].name);
en.n_namesz = strlen(fullname) + 1;
en.n_descsz = sz;
en.n_type = NT_SPU;
if (!dump_emit(cprm, &en, sizeof(en)))
- goto Eio;
-
+ return -EIO;
if (!dump_emit(cprm, fullname, en.n_namesz))
- goto Eio;
-
+ return -EIO;
if (!dump_align(cprm, 4))
- goto Eio;
+ return -EIO;
- do {
- rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
- if (rc > 0) {
- if (!dump_emit(cprm, buf, rc))
- goto Eio;
- total += rc;
- }
- } while (rc == bufsz && total < sz);
+ if (spufs_coredump_read[i].dump) {
+ ret = spufs_coredump_read[i].dump(ctx, cprm);
+ if (ret < 0)
+ return ret;
+ } else {
+ char buf[32];
- if (rc < 0)
- goto out;
+ ret = snprintf(buf, sizeof(buf), "0x%.16llx",
+ spufs_coredump_read[i].get(ctx));
+ if (ret >= sizeof(buf))
+ return sizeof(buf);
- skip = roundup(cprm->pos - total + sz, 4) - cprm->pos;
- if (!dump_skip(cprm, skip))
- goto Eio;
+ /* count trailing the NULL: */
+ if (!dump_emit(cprm, buf, ret + 1))
+ return -EIO;
+ }
- rc = 0;
-out:
- free_page((unsigned long)buf);
- return rc;
-Eio:
- free_page((unsigned long)buf);
- return -EIO;
+ if (!dump_skip(cprm, roundup(cprm->pos - ret + sz, 4) - cprm->pos))
+ return -EIO;
+ return 0;
}
int spufs_coredump_extra_notes_write(struct coredump_params *cprm)
--
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