It is useful to be able to control the order of data written to the SSDT so that we can compare the output against known-good kernel dumps.
Add code to record each item that is added along with the device that added it. That allows us to reorder things later if needed.
Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Wolfgang Wallner wolfgang.wallner@br-automation.com ---
Changes in v3: - Rename MAX_ITEMS to MAX_ACPI_ITEMS
Changes in v1: - Generalise the ACPI function recursion with acpi_recurse_method()
drivers/core/acpi.c | 83 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 79 insertions(+), 4 deletions(-)
diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c index 4497b5cb2f..df3d7ba417 100644 --- a/drivers/core/acpi.c +++ b/drivers/core/acpi.c @@ -9,12 +9,21 @@ #define LOG_CATEOGRY LOGC_ACPI
#include <common.h> +#include <malloc.h> #include <dm.h> #include <log.h> #include <dm/acpi.h> #include <dm/device-internal.h> #include <dm/root.h>
+#define MAX_ACPI_ITEMS 100 + +/* Type of table that we collected */ +enum gen_type_t { + TYPE_NONE, + TYPE_SSDT, +}; + /* Type of method to call */ enum method_t { METHOD_WRITE_TABLES, @@ -24,6 +33,25 @@ enum method_t { /* Prototype for all methods */ typedef int (*acpi_method)(const struct udevice *dev, struct acpi_ctx *ctx);
+/** + * struct acpi_item - Holds info about ACPI data generated by a driver method + * + * @dev: Device that generated this data + * @type: Table type it refers to + * @buf: Buffer containing the data + * @size: Size of the data in bytes + */ +struct acpi_item { + struct udevice *dev; + enum gen_type_t type; + char *buf; + int size; +}; + +/* List of ACPI items collected */ +static struct acpi_item acpi_item[MAX_ACPI_ITEMS]; +static int item_count; + int acpi_copy_name(char *out_name, const char *name) { strncpy(out_name, name, ACPI_NAME_LEN); @@ -43,6 +71,43 @@ int acpi_get_name(const struct udevice *dev, char *out_name) return -ENOSYS; }
+/** + * acpi_add_item() - Add a new item to the list of data collected + * + * @ctx: ACPI context + * @dev: Device that generated the data + * @type: Table type it refers to + * @start: The start of the data (the end is obtained from ctx->current) + * @return 0 if OK, -ENOSPC if too many items, -ENOMEM if out of memory + */ +static int acpi_add_item(struct acpi_ctx *ctx, struct udevice *dev, + enum gen_type_t type, void *start) +{ + struct acpi_item *item; + void *end = ctx->current; + + if (item_count == MAX_ACPI_ITEMS) { + log_err("Too many items\n"); + return log_msg_ret("mem", -ENOSPC); + } + + item = &acpi_item[item_count]; + item->dev = dev; + item->type = type; + item->size = end - start; + if (!item->size) + return 0; + item->buf = malloc(item->size); + if (!item->buf) + return log_msg_ret("mem", -ENOMEM); + memcpy(item->buf, start, item->size); + item_count++; + log_debug("* %s: Added type %d, %p, size %x\n", dev->name, type, start, + item->size); + + return 0; +} + acpi_method acpi_get_method(struct udevice *dev, enum method_t method) { struct acpi_ops *aops; @@ -61,7 +126,7 @@ acpi_method acpi_get_method(struct udevice *dev, enum method_t method) }
int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent, - enum method_t method) + enum method_t method, enum gen_type_t type) { struct udevice *dev; acpi_method func; @@ -69,6 +134,8 @@ int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent,
func = acpi_get_method(parent, method); if (func) { + void *start = ctx->current; + log_debug("\n"); log_debug("- %s %p\n", parent->name, func); ret = device_ofdata_to_platdata(parent); @@ -77,9 +144,16 @@ int acpi_recurse_method(struct acpi_ctx *ctx, struct udevice *parent, ret = func(parent, ctx); if (ret) return log_msg_ret("func", ret); + + /* Add the item to the internal list */ + if (type != TYPE_NONE) { + ret = acpi_add_item(ctx, parent, type, start); + if (ret) + return log_msg_ret("add", ret); + } } device_foreach_child(dev, parent) { - ret = acpi_recurse_method(ctx, dev, method); + ret = acpi_recurse_method(ctx, dev, method, type); if (ret) return log_msg_ret("recurse", ret); } @@ -92,7 +166,7 @@ int acpi_fill_ssdt(struct acpi_ctx *ctx) int ret;
log_debug("Writing SSDT tables\n"); - ret = acpi_recurse_method(ctx, dm_root(), METHOD_FILL_SSDT); + ret = acpi_recurse_method(ctx, dm_root(), METHOD_FILL_SSDT, TYPE_SSDT); log_debug("Writing SSDT finished, err=%d\n", ret);
return ret; @@ -103,7 +177,8 @@ int acpi_write_dev_tables(struct acpi_ctx *ctx) int ret;
log_debug("Writing device tables\n"); - ret = acpi_recurse_method(ctx, dm_root(), METHOD_WRITE_TABLES); + ret = acpi_recurse_method(ctx, dm_root(), METHOD_WRITE_TABLES, + TYPE_NONE); log_debug("Writing finished, err=%d\n", ret);
return ret;