add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/arch/powerpc/platforms/cell/spufs/coredump.c
..
..
@@ -1,23 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
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2
 /*
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  * SPU core dump code
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  *
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  * (C) Copyright 2006 IBM Corp.
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  *
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  * Author: Dwayne Grant McConnell <decimal@us.ibm.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2, or (at your option)
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- * any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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8
  */
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9
 
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10
 #include <linux/elf.h>
..
..
@@ -33,22 +20,6 @@
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20
 #include <linux/uaccess.h>
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21
 
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 #include "spufs.h"
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-
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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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-
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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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-
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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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23
 
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 static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
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25
 {
..
..
@@ -95,13 +66,20 @@
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  */
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 static struct spu_context *coredump_next_context(int *fd)
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 {
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+	struct spu_context *ctx;
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 	struct file *file;
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 	int n = iterate_fd(current->files, *fd, match_context, NULL);
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 	if (!n)
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 		return NULL;
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 	*fd = n - 1;
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+
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+	rcu_read_lock();
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 	file = fcheck(*fd);
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-	return SPUFS_I(file_inode(file))->i_ctx;
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+	ctx = SPUFS_I(file_inode(file))->i_ctx;
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+	get_spu_context(ctx);
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+	rcu_read_unlock();
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+
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+	return ctx;
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83
 }
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84
 
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 int spufs_coredump_extra_notes_size(void)
..
..
@@ -112,17 +90,23 @@
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90
 	fd = 0;
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91
 	while ((ctx = coredump_next_context(&fd)) != NULL) {
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92
 		rc = spu_acquire_saved(ctx);
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-		if (rc)
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+		if (rc) {
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+			put_spu_context(ctx);
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 			break;
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+		}
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+
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 		rc = spufs_ctx_note_size(ctx, fd);
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 		spu_release_saved(ctx);
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-		if (rc < 0)
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+		if (rc < 0) {
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+			put_spu_context(ctx);
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102
 			break;
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+		}
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104
 
122
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 		size += rc;
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106
 
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 		/* start searching the next fd next time */
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108
 		fd++;
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+		put_spu_context(ctx);
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110
 	}
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111
 
128
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 	return size;
..
..
@@ -131,58 +115,43 @@
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115
 static int spufs_arch_write_note(struct spu_context *ctx, int i,
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116
 				  struct coredump_params *cprm, int dfd)
133
117
 {
134
-	loff_t pos = 0;
135
-	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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+	int ret;
141
122
 
142
-	buf = (void *)get_zeroed_page(GFP_KERNEL);
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-	if (!buf)
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-		return -ENOMEM;
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-
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-	name = spufs_coredump_read[i].name;
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-	sz = spufs_coredump_read[i].size;
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-
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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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125
 	en.n_descsz = sz;
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126
 	en.n_type = NT_SPU;
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127
 
154
128
 	if (!dump_emit(cprm, &en, sizeof(en)))
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-		goto Eio;
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-
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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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-
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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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134
 
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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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-		}
170
-	} 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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141
 
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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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146
 
175
-	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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151
 
179
-	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:
184
-	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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155
 }
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156
 
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 int spufs_coredump_extra_notes_write(struct coredump_params *cprm)