--- /dev/null
+/*
+ * EFI block driver
+ *
+ * Copyright (c) 2017 Heinrich Schuchardt
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * The EFI uclass creates a handle for this driver and installs the
+ * driver binding protocol on it.
+ *
+ * The EFI block driver binds to controllers implementing the block io
+ * protocol.
+ *
+ * When the bind function of the EFI block driver is called it creates a
+ * new U-Boot block device. It installs child handles for all partitions and
+ * installs the simple file protocol on these.
+ *
+ * The read and write functions of the EFI block driver delegate calls to the
+ * controller that it is bound to.
+ *
+ * A usage example is as following:
+ *
+ * U-Boot loads the iPXE snp.efi executable. iPXE connects an iSCSI drive and
+ * exposes a handle with the block IO protocol. It calls ConnectController.
+ *
+ * Now the EFI block driver installs the partitions with the simple file
+ * protocol.
+ *
+ * iPXE uses the simple file protocol to load Grub or the Linux Kernel.
+ */
+
+#include <efi_driver.h>
+#include <dm/device-internal.h>
+#include <dm/root.h>
+
+/*
+ * EFI attributes of the udevice handled by this driver.
+ *
+ * handle handle of the controller on which this driver is installed
+ * io block io protocol proxied by this driver
+ */
+struct efi_blk_priv {
+ efi_handle_t handle;
+ struct efi_block_io *io;
+};
+
+/*
+ * Read from block device
+ *
+ * @dev device
+ * @blknr first block to be read
+ * @blkcnt number of blocks to read
+ * @buffer output buffer
+ * @return number of blocks transferred
+ */
+static ulong efi_bl_read(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
+ void *buffer)
+{
+ struct efi_blk_priv *priv = dev->priv;
+ struct efi_block_io *io = priv->io;
+ efi_status_t ret;
+
+ EFI_PRINT("%s: read '%s', from block " LBAFU ", " LBAFU " blocks\n",
+ __func__, dev->name, blknr, blkcnt);
+ ret = EFI_CALL(io->read_blocks(
+ io, io->media->media_id, (u64)blknr,
+ (efi_uintn_t)blkcnt *
+ (efi_uintn_t)io->media->block_size, buffer));
+ EFI_PRINT("%s: r = %u\n", __func__,
+ (unsigned int)(ret & ~EFI_ERROR_MASK));
+ if (ret != EFI_SUCCESS)
+ return 0;
+ return blkcnt;
+}
+
+/*
+ * Write to block device
+ *
+ * @dev device
+ * @blknr first block to be write
+ * @blkcnt number of blocks to write
+ * @buffer input buffer
+ * @return number of blocks transferred
+ */
+static ulong efi_bl_write(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
+ const void *buffer)
+{
+ struct efi_blk_priv *priv = dev->priv;
+ struct efi_block_io *io = priv->io;
+ efi_status_t ret;
+
+ EFI_PRINT("%s: write '%s', from block " LBAFU ", " LBAFU " blocks\n",
+ __func__, dev->name, blknr, blkcnt);
+ ret = EFI_CALL(io->write_blocks(
+ io, io->media->media_id, (u64)blknr,
+ (efi_uintn_t)blkcnt *
+ (efi_uintn_t)io->media->block_size,
+ (void *)buffer));
+ EFI_PRINT("%s: r = %u\n", __func__,
+ (unsigned int)(ret & ~EFI_ERROR_MASK));
+ if (ret != EFI_SUCCESS)
+ return 0;
+ return blkcnt;
+}
+
+/*
+ * Create partions for the block device.
+ *
+ * @handle EFI handle of the block device
+ * @dev udevice of the block device
+ */
+static int efi_bl_bind_partitions(efi_handle_t handle, struct udevice *dev)
+{
+ struct blk_desc *desc;
+ const char *if_typename;
+
+ desc = dev_get_uclass_platdata(dev);
+ if_typename = blk_get_if_type_name(desc->if_type);
+
+ return efi_disk_create_partitions(handle, desc, if_typename,
+ desc->devnum, dev->name);
+}
+
+/*
+ * Create a block device for a handle
+ *
+ * @handle handle
+ * @interface block io protocol
+ * @return 0 = success
+ */
+static int efi_bl_bind(efi_handle_t handle, void *interface)
+{
+ struct udevice *bdev, *parent = dm_root();
+ int ret, devnum;
+ char *name;
+ struct efi_object *obj = efi_search_obj(handle);
+ struct efi_block_io *io = interface;
+ int disks;
+ struct efi_blk_priv *priv;
+
+ EFI_PRINT("%s: handle %p, interface %p\n", __func__, handle, io);
+
+ if (!obj)
+ return -ENOENT;
+
+ devnum = blk_find_max_devnum(IF_TYPE_EFI);
+ if (devnum == -ENODEV)
+ devnum = 0;
+ else if (devnum < 0)
+ return devnum;
+
+ name = calloc(1, 18); /* strlen("efiblk#2147483648") + 1 */
+ if (!name)
+ return -ENOMEM;
+ sprintf(name, "efiblk#%d", devnum);
+
+ /* Create driver model udevice for the EFI block io device */
+ ret = blk_create_device(parent, "efi_blk", name, IF_TYPE_EFI, devnum,
+ io->media->block_size,
+ (lbaint_t)io->media->last_block, &bdev);
+ if (ret)
+ return ret;
+ if (!bdev)
+ return -ENOENT;
+ /* Allocate priv */
+ ret = device_probe(bdev);
+ if (ret)
+ return ret;
+ EFI_PRINT("%s: block device '%s' created\n", __func__, bdev->name);
+
+ priv = bdev->priv;
+ priv->handle = handle;
+ priv->io = interface;
+
+ ret = blk_prepare_device(bdev);
+
+ /* Create handles for the partions of the block device */
+ disks = efi_bl_bind_partitions(handle, bdev);
+ EFI_PRINT("Found %d partitions\n", disks);
+
+ return 0;
+}
+
+/* Block device driver operators */
+static const struct blk_ops efi_blk_ops = {
+ .read = efi_bl_read,
+ .write = efi_bl_write,
+};
+
+/* Identify as block device driver */
+U_BOOT_DRIVER(efi_blk) = {
+ .name = "efi_blk",
+ .id = UCLASS_BLK,
+ .ops = &efi_blk_ops,
+ .priv_auto_alloc_size = sizeof(struct efi_blk_priv),
+};
+
+/* EFI driver operators */
+static const struct efi_driver_ops driver_ops = {
+ .protocol = &efi_block_io_guid,
+ .child_protocol = &efi_block_io_guid,
+ .bind = efi_bl_bind,
+};
+
+/* Identify as EFI driver */
+U_BOOT_DRIVER(efi_block) = {
+ .name = "EFI block driver",
+ .id = UCLASS_EFI,
+ .ops = &driver_ops,
+};
--- /dev/null
+/*
+ * Uclass for EFI drivers
+ *
+ * Copyright (c) 2017 Heinrich Schuchardt
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * For each EFI driver the uclass
+ * - creates a handle
+ * - installs the driver binding protocol
+ *
+ * The uclass provides the bind, start, and stop entry points for the driver
+ * binding protocol.
+ *
+ * In bind() and stop() it checks if the controller implements the protocol
+ * supported by the EFI driver. In the start() function it calls the bind()
+ * function of the EFI driver. In the stop() function it destroys the child
+ * controllers.
+ */
+
+#include <efi_driver.h>
+
+/*
+ * Check node type. We do not support partitions as controller handles.
+ *
+ * @handle handle to be checked
+ * @return status code
+ */
+static efi_status_t check_node_type(efi_handle_t handle)
+{
+ efi_status_t r, ret = EFI_SUCCESS;
+ const struct efi_device_path *dp;
+
+ /* Open the device path protocol */
+ r = EFI_CALL(systab.boottime->open_protocol(
+ handle, &efi_guid_device_path, (void **)&dp,
+ NULL, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL));
+ if (r == EFI_SUCCESS && dp) {
+ /* Get the last node */
+ const struct efi_device_path *node = efi_dp_last_node(dp);
+ /* We do not support partitions as controller */
+ if (!node || node->type == DEVICE_PATH_TYPE_MEDIA_DEVICE)
+ ret = EFI_UNSUPPORTED;
+ }
+ return ret;
+}
+
+/*
+ * Check if the driver supports the controller.
+ *
+ * @this driver binding protocol
+ * @controller_handle handle of the controller
+ * @remaining_device_path path specifying the child controller
+ * @return status code
+ */
+static efi_status_t EFIAPI efi_uc_supported(
+ struct efi_driver_binding_protocol *this,
+ efi_handle_t controller_handle,
+ struct efi_device_path *remaining_device_path)
+{
+ efi_status_t r, ret;
+ void *interface;
+ struct efi_driver_binding_extended_protocol *bp =
+ (struct efi_driver_binding_extended_protocol *)this;
+
+ EFI_ENTRY("%p, %p, %ls", this, controller_handle,
+ efi_dp_str(remaining_device_path));
+
+ ret = EFI_CALL(systab.boottime->open_protocol(
+ controller_handle, bp->ops->protocol,
+ &interface, this->driver_binding_handle,
+ controller_handle, EFI_OPEN_PROTOCOL_BY_DRIVER));
+ switch (ret) {
+ case EFI_ACCESS_DENIED:
+ case EFI_ALREADY_STARTED:
+ goto out;
+ case EFI_SUCCESS:
+ break;
+ default:
+ ret = EFI_UNSUPPORTED;
+ goto out;
+ }
+
+ ret = check_node_type(controller_handle);
+
+ r = EFI_CALL(systab.boottime->close_protocol(
+ controller_handle, bp->ops->protocol,
+ this->driver_binding_handle,
+ controller_handle));
+ if (r != EFI_SUCCESS)
+ ret = EFI_UNSUPPORTED;
+out:
+ return EFI_EXIT(ret);
+}
+
+/*
+ * Create child controllers and attach driver.
+ *
+ * @this driver binding protocol
+ * @controller_handle handle of the controller
+ * @remaining_device_path path specifying the child controller
+ * @return status code
+ */
+static efi_status_t EFIAPI efi_uc_start(
+ struct efi_driver_binding_protocol *this,
+ efi_handle_t controller_handle,
+ struct efi_device_path *remaining_device_path)
+{
+ efi_status_t r, ret;
+ void *interface = NULL;
+ struct efi_driver_binding_extended_protocol *bp =
+ (struct efi_driver_binding_extended_protocol *)this;
+
+ EFI_ENTRY("%p, %pUl, %ls", this, controller_handle,
+ efi_dp_str(remaining_device_path));
+
+ /* Attach driver to controller */
+ ret = EFI_CALL(systab.boottime->open_protocol(
+ controller_handle, bp->ops->protocol,
+ &interface, this->driver_binding_handle,
+ controller_handle, EFI_OPEN_PROTOCOL_BY_DRIVER));
+ switch (ret) {
+ case EFI_ACCESS_DENIED:
+ case EFI_ALREADY_STARTED:
+ goto out;
+ case EFI_SUCCESS:
+ break;
+ default:
+ ret = EFI_UNSUPPORTED;
+ goto out;
+ }
+ ret = check_node_type(controller_handle);
+ if (ret != EFI_SUCCESS) {
+ r = EFI_CALL(systab.boottime->close_protocol(
+ controller_handle, bp->ops->protocol,
+ this->driver_binding_handle,
+ controller_handle));
+ if (r != EFI_SUCCESS)
+ EFI_PRINT("Failure to close handle\n");
+ goto out;
+ }
+
+ /* TODO: driver specific stuff */
+ bp->ops->bind(controller_handle, interface);
+
+out:
+ return EFI_EXIT(ret);
+}
+
+/*
+ * Remove a single child controller from the parent controller.
+ *
+ * @controller_handle parent controller
+ * @child_handle child controller
+ * @return status code
+ */
+static efi_status_t disconnect_child(efi_handle_t controller_handle,
+ efi_handle_t child_handle)
+{
+ efi_status_t ret;
+ efi_guid_t *guid_controller = NULL;
+ efi_guid_t *guid_child_controller = NULL;
+
+ ret = EFI_CALL(systab.boottime->close_protocol(
+ controller_handle, guid_controller,
+ child_handle, child_handle));
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("Cannot close protocol\n");
+ return ret;
+ }
+ ret = EFI_CALL(systab.boottime->uninstall_protocol_interface(
+ child_handle, guid_child_controller, NULL));
+ if (ret != EFI_SUCCESS) {
+ EFI_PRINT("Cannot uninstall protocol interface\n");
+ return ret;
+ }
+ return ret;
+}
+
+/*
+ * Remove child controllers and disconnect the controller.
+ *
+ * @this driver binding protocol
+ * @controller_handle handle of the controller
+ * @number_of_children number of child controllers to remove
+ * @child_handle_buffer handles of the child controllers to remove
+ * @return status code
+ */
+static efi_status_t EFIAPI efi_uc_stop(
+ struct efi_driver_binding_protocol *this,
+ efi_handle_t controller_handle,
+ size_t number_of_children,
+ efi_handle_t *child_handle_buffer)
+{
+ efi_status_t ret;
+ efi_uintn_t count;
+ struct efi_open_protocol_info_entry *entry_buffer;
+ efi_guid_t *guid_controller = NULL;
+
+ EFI_ENTRY("%p, %pUl, %zu, %p", this, controller_handle,
+ number_of_children, child_handle_buffer);
+
+ /* Destroy provided child controllers */
+ if (number_of_children) {
+ efi_uintn_t i;
+
+ for (i = 0; i < number_of_children; ++i) {
+ ret = disconnect_child(controller_handle,
+ child_handle_buffer[i]);
+ if (ret != EFI_SUCCESS)
+ return ret;
+ }
+ return EFI_SUCCESS;
+ }
+
+ /* Destroy all children */
+ ret = EFI_CALL(systab.boottime->open_protocol_information(
+ controller_handle, guid_controller,
+ &entry_buffer, &count));
+ if (ret != EFI_SUCCESS)
+ goto out;
+ while (count) {
+ if (entry_buffer[--count].attributes &
+ EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
+ ret = disconnect_child(
+ controller_handle,
+ entry_buffer[count].agent_handle);
+ if (ret != EFI_SUCCESS)
+ goto out;
+ }
+ }
+ ret = EFI_CALL(systab.boottime->free_pool(entry_buffer));
+ if (ret != EFI_SUCCESS)
+ printf("%s(%u) %s: ERROR: Cannot free pool\n",
+ __FILE__, __LINE__, __func__);
+
+ /* Detach driver from controller */
+ ret = EFI_CALL(systab.boottime->close_protocol(
+ controller_handle, guid_controller,
+ this->driver_binding_handle, controller_handle));
+out:
+ return EFI_EXIT(ret);
+}
+
+static efi_status_t efi_add_driver(struct driver *drv)
+{
+ efi_status_t ret;
+ const struct efi_driver_ops *ops = drv->ops;
+ struct efi_driver_binding_extended_protocol *bp;
+
+ debug("EFI: Adding driver '%s'\n", drv->name);
+ if (!ops->protocol) {
+ printf("EFI: ERROR: protocol GUID missing for driver '%s'\n",
+ drv->name);
+ return EFI_INVALID_PARAMETER;
+ }
+ bp = calloc(1, sizeof(struct efi_driver_binding_extended_protocol));
+ if (!bp)
+ return EFI_OUT_OF_RESOURCES;
+
+ bp->bp.supported = efi_uc_supported;
+ bp->bp.start = efi_uc_start;
+ bp->bp.stop = efi_uc_stop;
+ bp->bp.version = 0xffffffff;
+ bp->ops = drv->ops;
+
+ ret = efi_create_handle(&bp->bp.driver_binding_handle);
+ if (ret != EFI_SUCCESS) {
+ free(bp);
+ goto out;
+ }
+ bp->bp.image_handle = bp->bp.driver_binding_handle;
+ ret = efi_add_protocol(bp->bp.driver_binding_handle,
+ &efi_guid_driver_binding_protocol, bp);
+ if (ret != EFI_SUCCESS) {
+ efi_delete_handle(bp->bp.driver_binding_handle);
+ free(bp);
+ goto out;
+ }
+out:
+ return ret;
+}
+
+/*
+ * Initialize the EFI drivers.
+ * Called by board_init_r().
+ *
+ * @return 0 = success, any other value will stop further execution
+ */
+int efi_driver_init(void)
+{
+ struct driver *drv;
+ int ret = 0;
+
+ /* Save 'gd' pointer */
+ efi_save_gd();
+
+ debug("EFI: Initializing EFI driver framework\n");
+ for (drv = ll_entry_start(struct driver, driver);
+ drv < ll_entry_end(struct driver, driver); ++drv) {
+ if (drv->id == UCLASS_EFI) {
+ ret = efi_add_driver(drv);
+ if (ret) {
+ printf("EFI: ERROR: failed to add driver %s\n",
+ drv->name);
+ break;
+ }
+ }
+ }
+ return ret;
+}
+
+static int efi_uc_init(struct uclass *class)
+{
+ printf("EFI: Initializing UCLASS_EFI\n");
+ return 0;
+}
+
+static int efi_uc_destroy(struct uclass *class)
+{
+ printf("Destroying UCLASS_EFI\n");
+ return 0;
+}
+
+UCLASS_DRIVER(efi) = {
+ .name = "efi",
+ .id = UCLASS_EFI,
+ .init = efi_uc_init,
+ .destroy = efi_uc_destroy,
+};
projects / people / ms / u-boot.git / commitdiff
