Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi into...

[platform/kernel/linux-rpi.git] / drivers / firmware / efi / efi.c

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index d1746a5..1d5e9a0 100644 (file)
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -17,6 +17,7 @@
 #include <linux/kobject.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/efi.h>
 #include <linux/of.h>
@@ -291,6 +292,59 @@ free_entry:
 static inline int efivar_ssdt_load(void) { return 0; }
 #endif
 
+#ifdef CONFIG_DEBUG_FS
+
+#define EFI_DEBUGFS_MAX_BLOBS 32
+
+static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS];
+
+static void __init efi_debugfs_init(void)
+{
+       struct dentry *efi_debugfs;
+       efi_memory_desc_t *md;
+       char name[32];
+       int type_count[EFI_BOOT_SERVICES_DATA + 1] = {};
+       int i = 0;
+
+       efi_debugfs = debugfs_create_dir("efi", NULL);
+       if (IS_ERR_OR_NULL(efi_debugfs))
+               return;
+
+       for_each_efi_memory_desc(md) {
+               switch (md->type) {
+               case EFI_BOOT_SERVICES_CODE:
+                       snprintf(name, sizeof(name), "boot_services_code%d",
+                                type_count[md->type]++);
+                       break;
+               case EFI_BOOT_SERVICES_DATA:
+                       snprintf(name, sizeof(name), "boot_services_data%d",
+                                type_count[md->type]++);
+                       break;
+               default:
+                       continue;
+               }
+
+               if (i >= EFI_DEBUGFS_MAX_BLOBS) {
+                       pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n",
+                               EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS);
+                       break;
+               }
+
+               debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT;
+               debugfs_blob[i].data = memremap(md->phys_addr,
+                                               debugfs_blob[i].size,
+                                               MEMREMAP_WB);
+               if (!debugfs_blob[i].data)
+                       continue;
+
+               debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]);
+               i++;
+       }
+}
+#else
+static inline void efi_debugfs_init(void) {}
+#endif
+
 /*
  * We register the efi subsystem with the firmware subsystem and the
  * efivars subsystem with the efi subsystem, if the system was booted with
@@ -357,6 +411,9 @@ static int __init efisubsys_init(void)
                goto err_remove_group;
        }
 
+       if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))
+               efi_debugfs_init();
+
        return 0;
 
 err_remove_group: