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efi: Use early_mem*() instead of early_io*()

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Use early_mem*() instead of early_io*() because all mapped EFI regions
are memory (usually RAM but they could also be ROM, EPROM, EEPROM, flash,
etc.) not I/O regions. Additionally, I/O family calls do not work correctly
under Xen in our case. early_ioremap() skips the PFN to MFN conversion
when building the PTE. Using it for memory will attempt to map the wrong
machine frame. However, all artificial EFI structures created under Xen
live in dom0 memory and should be mapped/unmapped using early_mem*() family
calls which map domain memory.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Mark Salter <msalter@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Daniel Kiper
2014-06-30 19:52:56 +02:00
committed by Matt Fleming
parent 4fa62481e2
commit abc93f8eb6
2 changed files with 16 additions and 16 deletions
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drivers/firmware/efi/efi.c
+2 -2
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@@ -298,7 +298,7 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables)
if (table64 >> 32) {
pr_cont("\n");
pr_err("Table located above 4GB, disabling EFI.\n");
early_iounmap(config_tables,
early_memunmap(config_tables,
efi.systab->nr_tables * sz);
return -EINVAL;
}
@@ -314,7 +314,7 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables)
tablep += sz;
}
pr_cont("\n");
early_iounmap(config_tables, efi.systab->nr_tables * sz);
early_memunmap(config_tables, efi.systab->nr_tables * sz);
set_bit(EFI_CONFIG_TABLES, &efi.flags);