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5573f6ad3e
Currently the debugfs interface to print the segment configuration refuses to print the physical address of mapped segments. However if the EU bit is set these become unmapped at error level (when CP0_Status.ERL=1), so the physical address is still relevant. Update the logic to print the physical address of mapped segments when the EU bit is set, while still hiding the Cache Coherency Attribute (since EU overrides that to uncached when ERL=1 too). Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13833/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <asm/cpu.h>
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#include <asm/debug.h>
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#include <asm/mipsregs.h>
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static void build_segment_config(char *str, unsigned int cfg)
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{
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unsigned int am;
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static const char * const am_str[] = {
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"UK", "MK", "MSK", "MUSK", "MUSUK", "USK",
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"RSRVD", "UUSK"};
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/* Segment access mode. */
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am = (cfg & MIPS_SEGCFG_AM) >> MIPS_SEGCFG_AM_SHIFT;
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str += sprintf(str, "%-5s", am_str[am]);
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/*
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* Access modes MK, MSK and MUSK are mapped segments. Therefore
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* there is no direct physical address mapping unless it becomes
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* unmapped uncached at error level due to EU.
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*/
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if ((am == 0) || (am > 3) || (cfg & MIPS_SEGCFG_EU))
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str += sprintf(str, " %03lx",
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((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT));
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else
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str += sprintf(str, " UND");
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if ((am == 0) || (am > 3))
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str += sprintf(str, " %01ld",
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((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT));
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else
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str += sprintf(str, " U");
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/* Exception configuration. */
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str += sprintf(str, " %01ld\n",
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((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT));
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}
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static int show_segments(struct seq_file *m, void *v)
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{
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unsigned int segcfg;
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char str[42];
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seq_puts(m, "Segment Virtual Size Access Mode Physical Caching EU\n");
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seq_puts(m, "------- ------- ---- ----------- -------- ------- --\n");
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segcfg = read_c0_segctl0();
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build_segment_config(str, segcfg);
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seq_printf(m, " 0 e0000000 512M %s", str);
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segcfg >>= 16;
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build_segment_config(str, segcfg);
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seq_printf(m, " 1 c0000000 512M %s", str);
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segcfg = read_c0_segctl1();
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build_segment_config(str, segcfg);
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seq_printf(m, " 2 a0000000 512M %s", str);
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segcfg >>= 16;
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build_segment_config(str, segcfg);
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seq_printf(m, " 3 80000000 512M %s", str);
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segcfg = read_c0_segctl2();
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build_segment_config(str, segcfg);
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seq_printf(m, " 4 40000000 1G %s", str);
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segcfg >>= 16;
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build_segment_config(str, segcfg);
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seq_printf(m, " 5 00000000 1G %s\n", str);
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return 0;
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}
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static int segments_open(struct inode *inode, struct file *file)
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{
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return single_open(file, show_segments, NULL);
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}
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static const struct file_operations segments_fops = {
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.open = segments_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init segments_info(void)
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{
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struct dentry *segments;
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if (cpu_has_segments) {
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if (!mips_debugfs_dir)
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return -ENODEV;
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segments = debugfs_create_file("segments", S_IRUGO,
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mips_debugfs_dir, NULL,
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&segments_fops);
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if (!segments)
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return -ENOMEM;
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}
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return 0;
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}
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device_initcall(segments_info);
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