Author: imp
Date: Mon Jul 23 20:36:54 2018
New Revision: 336655
URL: https://svnweb.freebsd.org/changeset/base/336655
Log:
Implement efiblk_get_pdinfo_by_device_path
Lookup a block device by it's device path. We use a 'loose' lookup
whereby we scan forward to the first Media Path portion of the device
path, then look at all our handles for one whose first Media Path
matches. This will also work if the device path pointed to has a
following file path (or paths) as that's ignored. It assumes that
there's only one media path node that describes the entire device,
which is true as of the latest UEFI spec (2.7 Errata A) as far as I've
been able to determine.
Sponsored by: Netflix
Modified:
head/stand/efi/include/efilib.h
head/stand/efi/libefi/efipart.c
Modified: head/stand/efi/include/efilib.h
==============================================================================
--- head/stand/efi/include/efilib.h Mon Jul 23 20:36:50 2018
(r336654)
+++ head/stand/efi/include/efilib.h Mon Jul 23 20:36:54 2018
(r336655)
@@ -66,6 +66,7 @@ typedef struct pdinfo
pdinfo_list_t *efiblk_get_pdinfo_list(struct devsw *dev);
pdinfo_t *efiblk_get_pdinfo(struct devdesc *dev);
pdinfo_t *efiblk_get_pdinfo_by_handle(EFI_HANDLE h);
+pdinfo_t *efiblk_get_pdinfo_by_device_path(EFI_DEVICE_PATH *path);
void *efi_get_table(EFI_GUID *tbl);
Modified: head/stand/efi/libefi/efipart.c
==============================================================================
--- head/stand/efi/libefi/efipart.c Mon Jul 23 20:36:50 2018
(r336654)
+++ head/stand/efi/libefi/efipart.c Mon Jul 23 20:36:54 2018
(r336655)
@@ -137,6 +137,28 @@ efiblk_get_pdinfo(struct devdesc *dev)
return (pd);
}
+pdinfo_t *
+efiblk_get_pdinfo_by_device_path(EFI_DEVICE_PATH *path)
+{
+ unsigned i;
+ EFI_DEVICE_PATH *media, *devpath;
+ EFI_HANDLE h;
+
+ media = efi_devpath_to_media_path(path);
+ if (media == NULL)
+ return (NULL);
+ for (i = 0; i < efipart_nhandles; i++) {
+ h = efipart_handles[i];
+ devpath = efi_lookup_devpath(h);
+ if (devpath == NULL)
+ continue;
+ if (!efi_devpath_match_node(media,
efi_devpath_to_media_path(devpath)))
+ continue;
+ return (efiblk_get_pdinfo_by_handle(h));
+ }
+ return (NULL);
+}
+
static bool
same_handle(pdinfo_t *pd, EFI_HANDLE h)
{
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