From patchwork Wed Apr 29 02:21:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Glass X-Patchwork-Id: 238817 List-Id: U-Boot discussion From: sjg at chromium.org (Simon Glass) Date: Tue, 28 Apr 2020 20:21:52 -0600 Subject: [PATCH v1 28/35] acpi: Record the items added to SSDT In-Reply-To: <20200429022159.254271-1-sjg@chromium.org> References: <20200429022159.254271-1-sjg@chromium.org> Message-ID: <20200428202137.v1.28.I1f119e7a847da3e0b2b1791e6f48acaeaf25a223@changeid> 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 --- 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 5014629ac1..e5474970a4 100644 --- a/drivers/core/acpi.c +++ b/drivers/core/acpi.c @@ -9,11 +9,20 @@ #define LOG_CATEOGRY LOGC_ACPI #include +#include #include #include #include #include +#define MAX_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, @@ -23,6 +32,25 @@ 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_ITEMS]; +static int item_count; + int acpi_copy_name(char *out_name, const char *name) { strncpy(out_name, name, ACPI_NAME_LEN); @@ -42,6 +70,43 @@ 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_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; @@ -60,7 +125,7 @@ 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; @@ -68,6 +133,8 @@ 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); @@ -76,9 +143,16 @@ 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); } @@ -91,7 +165,7 @@ 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; @@ -102,7 +176,8 @@ 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;