+}
+
+static void *rproc_coredump_find_segment(loff_t user_offset,
+ struct list_head *segments,
+ size_t *data_left)
+{
+ struct rproc_dump_segment *segment;
+
+ list_for_each_entry(segment, segments, node) {
+ if (user_offset < segment->size) {
+ *data_left = segment->size - user_offset;
+ return segment;
+ }
+ user_offset -= segment->size;
+ }
+
+ *data_left = 0;
+ return NULL;
+}
+
+static void rproc_copy_segment(struct rproc *rproc, void *dest,
+ struct rproc_dump_segment *segment,
+ size_t offset, size_t size)
+{
+ void *ptr;
+
+ if (segment->dump) {
+ segment->dump(rproc, segment, dest, offset, size);
+ } else {
+ ptr = rproc_da_to_va(rproc, segment->da + offset, size);
+ if (!ptr) {
+ dev_err(&rproc->dev,
+ "invalid copy request for segment %pad with offset %zu and size
%zu)\n",
+ &segment->da, offset, size);
+ memset(dest, 0xff, size);
+ } else {
+ memcpy(dest, ptr, size);
+ }
+ }
+}
+
+static ssize_t rproc_coredump_read(char *buffer, loff_t offset,
size_t count,
+ void *data, size_t header_sz)
+{
+ size_t seg_data, bytes_left = count;
+ ssize_t copy_sz;
+ struct rproc_dump_segment *seg;
+ struct rproc_coredump_state *dump_state = data;
+ struct rproc *rproc = dump_state->rproc;
+ void *elfcore = dump_state->header;
+
+ /* Copy the vmalloc'ed header first. */
+ if (offset < header_sz) {
+ copy_sz = memory_read_from_buffer(buffer, count, &offset,
+ elfcore, header_sz);
+
+ return copy_sz;
+ }
+
+ /*
+ * Find out the segment memory chunk to be copied based on offset.
+ * Keep copying data until count bytes are read.
+ */
+ while (bytes_left) {
+ seg = rproc_coredump_find_segment(offset - header_sz,
+ &rproc->dump_segments,
+ &seg_data);
+ /* EOF check */
+ if (!seg) {
+ dev_info(&rproc->dev, "Ramdump done, %lld bytes read",
+ offset);
+ break;
+ }
+
+ copy_sz = min_t(size_t, bytes_left, seg_data);
+
+ rproc_copy_segment(rproc, buffer, seg, seg->size - seg_data,
+ copy_sz);
+
+ offset += copy_sz;
+ buffer += copy_sz;
+ bytes_left -= copy_sz;
+ }
+
+ return count - bytes_left;
+}
+
/**
* rproc_coredump() - perform coredump
* @rproc: rproc handle
*
* This function will generate an ELF header for the registered
segments
- * and create a devcoredump device associated with rproc.
+ * and create a devcoredump device associated with rproc. Based on
the
+ * coredump configuration this function will directly copy the
segments
+ * from device memory to userspace or copy segments from device
memory to
+ * a separate buffer, which can then be read by userspace.
+ * The first approach avoids using extra vmalloc memory. But it will
stall
+ * recovery flow until dump is read by userspace.
*/
void rproc_coredump(struct rproc *rproc)
{
@@ -129,11 +235,13 @@ void rproc_coredump(struct rproc *rproc)
size_t data_size;
size_t offset;
void *data;
- void *ptr;
u8 class = rproc->elf_class;
int phnum = 0;
+ struct rproc_coredump_state dump_state;
+ enum rproc_dump_mechanism dump_conf = rproc->dump_conf;
- if (list_empty(&rproc->dump_segments))
+ if (list_empty(&rproc->dump_segments) ||
+ dump_conf == RPROC_COREDUMP_DISABLED)
return;
if (class == ELFCLASSNONE) {
@@ -143,7 +251,14 @@ void rproc_coredump(struct rproc *rproc)
data_size = elf_size_of_hdr(class);
list_for_each_entry(segment, &rproc->dump_segments, node) {
- data_size += elf_size_of_phdr(class) + segment->size;
+ /*
+ * For default configuration buffer includes headers & segments.
+ * For inline dump buffer just includes headers as segments are
+ * directly read from device memory.
+ */
+ data_size += elf_size_of_phdr(class);
+ if (dump_conf == RPROC_COREDUMP_DEFAULT)
+ data_size += segment->size;
phnum++;
}
@@ -182,23 +297,30 @@ void rproc_coredump(struct rproc *rproc)
elf_phdr_set_p_flags(class, phdr, PF_R | PF_W | PF_X);
elf_phdr_set_p_align(class, phdr, 0);
- if (segment->dump) {
- segment->dump(rproc, segment, data + offset);
- } else {
- ptr = rproc_da_to_va(rproc, segment->da, segment->size);
- if (!ptr) {
- dev_err(&rproc->dev,
- "invalid coredump segment (%pad, %zu)\n",
- &segment->da, segment->size);
- memset(data + offset, 0xff, segment->size);
- } else {
- memcpy(data + offset, ptr, segment->size);
- }
- }
+ if (dump_conf == RPROC_COREDUMP_DEFAULT)
+ rproc_copy_segment(rproc, data + offset, segment, 0,
+ segment->size);
offset += elf_phdr_get_p_filesz(class, phdr);
phdr += elf_size_of_phdr(class);
}
- dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
+ if (dump_conf == RPROC_COREDUMP_DEFAULT) {
+ dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
+ return;
+ }
+
+ /* Initialize the dump state struct to be used by
rproc_coredump_read */
+ dump_state.rproc = rproc;
+ dump_state.header = data;
+ init_completion(&dump_state.dump_done);
+
+ dev_coredumpm(&rproc->dev, NULL, &dump_state, data_size, GFP_KERNEL,
+ rproc_coredump_read, rproc_coredump_free);
+
+ /*
+ * Wait until the dump is read and free is called. Data is freed
+ * by devcoredump framework automatically after 5 minutes.
+ */
+ wait_for_completion(&dump_state.dump_done);
}
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index e7b7bab..38d037d 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -435,6 +435,20 @@ enum rproc_crash_type {
};
/**
+ * enum rproc_dump_mechanism - Coredump options for core
+ * @RPROC_COREDUMP_DEFAULT: Copy dump to separate buffer and carry on
with
+ recovery
+ * @RPROC_COREDUMP_INLINE: Read segments directly from device memory.
Stall
+ recovery until all segments are read
+ * @RPROC_COREDUMP_DISABLED: Don't perform any dump
+ */
+enum rproc_dump_mechanism {
+ RPROC_COREDUMP_DEFAULT,
+ RPROC_COREDUMP_INLINE,
+ RPROC_COREDUMP_DISABLED,
+};
+
+/**
* struct rproc_dump_segment - segment info from ELF header
* @node: list node related to the rproc segment list
* @da: device address of the segment
@@ -451,7 +465,7 @@ struct rproc_dump_segment {
void *priv;
void (*dump)(struct rproc *rproc, struct rproc_dump_segment
*segment,
- void *dest);
+ void *dest, size_t offset, size_t size);
loff_t offset;
};
@@ -466,6 +480,7 @@ struct rproc_dump_segment {
* @dev: virtual device for refcounting and common remoteproc
behavior
* @power: refcount of users who need this rproc powered up
* @state: state of the device
+ * @dump_conf: Currently selected coredump configuration
* @lock: lock which protects concurrent manipulations of the rproc
* @dbg_dir: debugfs directory of this rproc device
* @traces: list of trace buffers
@@ -499,6 +514,7 @@ struct rproc {
struct device dev;
atomic_t power;
unsigned int state;
+ enum rproc_dump_mechanism dump_conf;
struct mutex lock;
struct dentry *dbg_dir;
struct list_head traces;
@@ -630,7 +646,8 @@ int rproc_coredump_add_custom_segment(struct rproc
*rproc,
dma_addr_t da, size_t size,
void (*dumpfn)(struct rproc *rproc,
struct rproc_dump_segment *segment,
- void *dest),
+ void *dest, size_t offset,
+ size_t size),
void *priv);
int rproc_coredump_set_elf_info(struct rproc *rproc, u8 class, u16
machine);
