Re: [PATCH v5 2/3] remoteproc: Add inline coredump functionality

From: kernel test robot
Date: Wed Jun 24 2020 - 02:43:06 EST

Hi Rishabh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on linus/master v5.8-rc2 next-20200623]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Rishabh-Bhatnagar/Extend-coredump-functionality/20200624-092759
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e857ce6eae7ca21b2055cca4885545e29228fe2
config: arc-allyesconfig (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from include/linux/device.h:15,
from include/linux/devcoredump.h:8,
from drivers/remoteproc/remoteproc_coredump.c:9:
drivers/remoteproc/remoteproc_coredump.c: In function 'rproc_copy_segment':
>> drivers/remoteproc/remoteproc_coredump.c:163:5: warning: format '%zu' expects argument of type 'size_t', but argument 3 has type 'dma_addr_t' {aka 'long long unsigned int'} [-Wformat=]
163 | "invalid copy request (%zu, %zu)\n",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/dev_printk.h:19:22: note: in definition of macro 'dev_fmt'
19 | #define dev_fmt(fmt) fmt
| ^~~
>> drivers/remoteproc/remoteproc_coredump.c:162:4: note: in expansion of macro 'dev_err'
162 | dev_err(&rproc->dev,
| ^~~~~~~
drivers/remoteproc/remoteproc_coredump.c:163:30: note: format string is defined here
163 | "invalid copy request (%zu, %zu)\n",
| ~~^
| |
| unsigned int
| %llu
drivers/remoteproc/remoteproc_coredump.c: In function 'rproc_coredump_read':
>> drivers/remoteproc/remoteproc_coredump.c:186:15: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits]
186 | if (copy_sz < 0)
| ^

vim +163 drivers/remoteproc/remoteproc_coredump.c

> 9 #include <linux/devcoredump.h>
10 #include <linux/device.h>
11 #include <linux/kernel.h>
12 #include <linux/remoteproc.h>
13 #include "remoteproc_internal.h"
14 #include "remoteproc_elf_helpers.h"
15
16 struct rproc_coredump_state {
17 struct rproc *rproc;
18 void *header;
19 struct completion dump_done;
20 };
21
22 /**
23 * rproc_coredump_cleanup() - clean up dump_segments list
24 * @rproc: the remote processor handle
25 */
26 void rproc_coredump_cleanup(struct rproc *rproc)
27 {
28 struct rproc_dump_segment *entry, *tmp;
29
30 list_for_each_entry_safe(entry, tmp, &rproc->dump_segments, node) {
31 list_del(&entry->node);
32 kfree(entry);
33 }
34 }
35
36 /**
37 * rproc_coredump_add_segment() - add segment of device memory to coredump
38 * @rproc: handle of a remote processor
39 * @da: device address
40 * @size: size of segment
41 *
42 * Add device memory to the list of segments to be included in a coredump for
43 * the remoteproc.
44 *
45 * Return: 0 on success, negative errno on error.
46 */
47 int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size)
48 {
49 struct rproc_dump_segment *segment;
50
51 segment = kzalloc(sizeof(*segment), GFP_KERNEL);
52 if (!segment)
53 return -ENOMEM;
54
55 segment->da = da;
56 segment->size = size;
57
58 list_add_tail(&segment->node, &rproc->dump_segments);
59
60 return 0;
61 }
62 EXPORT_SYMBOL(rproc_coredump_add_segment);
63
64 /**
65 * rproc_coredump_add_custom_segment() - add custom coredump segment
66 * @rproc: handle of a remote processor
67 * @da: device address
68 * @size: size of segment
69 * @dumpfn: custom dump function called for each segment during coredump
70 * @priv: private data
71 *
72 * Add device memory to the list of segments to be included in the coredump
73 * and associate the segment with the given custom dump function and private
74 * data.
75 *
76 * Return: 0 on success, negative errno on error.
77 */
78 int rproc_coredump_add_custom_segment(struct rproc *rproc,
79 dma_addr_t da, size_t size,
80 void (*dumpfn)(struct rproc *rproc,
81 struct rproc_dump_segment *segment,
82 void *dest, size_t offset,
83 size_t size),
84 void *priv)
85 {
86 struct rproc_dump_segment *segment;
87
88 segment = kzalloc(sizeof(*segment), GFP_KERNEL);
89 if (!segment)
90 return -ENOMEM;
91
92 segment->da = da;
93 segment->size = size;
94 segment->priv = priv;
95 segment->dump = dumpfn;
96
97 list_add_tail(&segment->node, &rproc->dump_segments);
98
99 return 0;
100 }
101 EXPORT_SYMBOL(rproc_coredump_add_custom_segment);
102
103 /**
104 * rproc_coredump_set_elf_info() - set coredump elf information
105 * @rproc: handle of a remote processor
106 * @class: elf class for coredump elf file
107 * @machine: elf machine for coredump elf file
108 *
109 * Set elf information which will be used for coredump elf file.
110 *
111 * Return: 0 on success, negative errno on error.
112 */
113 int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16 machine)
114 {
115 if (class != ELFCLASS64 && class != ELFCLASS32)
116 return -EINVAL;
117
118 rproc->elf_class = class;
119 rproc->elf_machine = machine;
120
121 return 0;
122 }
123 EXPORT_SYMBOL(rproc_coredump_set_elf_info);
124
125 static void rproc_coredump_free(void *data)
126 {
127 struct rproc_coredump_state *dump_state = data;
128
129 complete(&dump_state->dump_done);
130 vfree(dump_state->header);
131 }
132
133 static void *rproc_coredump_find_segment(loff_t user_offset,
134 struct list_head *segments,
135 size_t *data_left)
136 {
137 struct rproc_dump_segment *segment;
138
139 list_for_each_entry(segment, segments, node) {
140 if (user_offset < segment->size) {
141 *data_left = segment->size - user_offset;
142 return segment;
143 }
144 user_offset -= segment->size;
145 }
146
147 *data_left = 0;
148 return NULL;
149 }
150
151 static void rproc_copy_segment(struct rproc *rproc, void *dest,
152 struct rproc_dump_segment *segment,
153 size_t offset, size_t size)
154 {
155 void *ptr;
156
157 if (segment->dump) {
158 segment->dump(rproc, segment, dest, offset, size);
159 } else {
160 ptr = rproc_da_to_va(rproc, segment->da + offset, size);
161 if (!ptr) {
> 162 dev_err(&rproc->dev,
> 163 "invalid copy request (%zu, %zu)\n",
164 segment->da + offset, size);
165 memset(dest, 0xff, size);
166 } else {
167 memcpy(dest, ptr, size);
168 }
169 }
170 }
171
172 static ssize_t rproc_coredump_read(char *buffer, loff_t offset, size_t count,
173 void *data, size_t header_sz)
174 {
175 size_t seg_data;
176 size_t copy_sz, bytes_left = count;
177 struct rproc_dump_segment *seg;
178 struct rproc_coredump_state *dump_state = data;
179 struct rproc *rproc = dump_state->rproc;
180 void *elfcore = dump_state->header;
181
182 /* Copy the vmalloc'ed header first. */
183 if (offset < header_sz) {
184 copy_sz = memory_read_from_buffer(buffer, count, &offset,
185 elfcore, header_sz);
> 186 if (copy_sz < 0)
187 return -EINVAL;
188
189 return copy_sz;
190 }
191
192 /*
193 * Find out the segment memory chunk to be copied based on offset.
194 * Keep copying data until count bytes are read.
195 */
196 while (bytes_left) {
197 seg = rproc_coredump_find_segment(offset - header_sz,
198 &rproc->dump_segments,
199 &seg_data);
200 /* EOF check */
201 if (!seg) {
202 dev_info(&rproc->dev, "Ramdump done, %lld bytes read",
203 offset);
204 break;
205 }
206
207 copy_sz = min_t(size_t, bytes_left, seg_data);
208
209 rproc_copy_segment(rproc, buffer, seg, seg->size - seg_data,
210 copy_sz);
211
212 offset += copy_sz;
213 buffer += copy_sz;
214 bytes_left -= copy_sz;
215 }
216
217 return count - bytes_left;
218 }
219

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