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efi/capsule-loader: Redirect calls to efi_capsule_setup_info() via weak alias 

To allow platform specific code to hook into the capsule loading
routines, indirect calls to efi_capsule_setup_info() via a weak alias
of __efi_capsule_setup_info(), allowing platforms to redefine the former
but still use the latter.

Tested-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170602135207.21708-9-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ard Biesheuvel 2017-06-02 13:52:02 +00:00 committed by Ingo Molnar
parent 171fd02229
commit 3fabd628d5
2 changed files with 39 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/firmware/efi/capsule-loader.c
View File

@ -20,16 +20,6 @@
#define NO_FURTHER_WRITE_ACTION -1
struct capsule_info {
efi_capsule_header_t header;
int reset_type;
long index;
size_t count;
size_t total_size;
struct page **pages;
size_t page_bytes_remain;
};
/**
* efi_free_all_buff_pages - free all previous allocated buffer pages
* @cap_info: pointer to current instance of capsule_info structure
@ -46,28 +36,13 @@ static void efi_free_all_buff_pages(struct capsule_info *cap_info)
cap_info->index = NO_FURTHER_WRITE_ACTION;
}
/**
* efi_capsule_setup_info - obtain the efi capsule header in the binary and
* setup capsule_info structure
* @cap_info: pointer to current instance of capsule_info structure
* @kbuff: a mapped first page buffer pointer
* @hdr_bytes: the total received number of bytes for efi header
**/
static int efi_capsule_setup_info(struct capsule_info *cap_info,
void *kbuff, size_t hdr_bytes)
int __efi_capsule_setup_info(struct capsule_info *cap_info)
{
size_t pages_needed;
int ret;
void *temp_page;
/* Only process data block that is larger than efi header size */
if (hdr_bytes < sizeof(efi_capsule_header_t))
return 0;
/* Reset back to the correct offset of header */
kbuff -= cap_info->count;
memcpy(&cap_info->header, kbuff, sizeof(cap_info->header));
pages_needed = ALIGN(cap_info->header.imagesize, PAGE_SIZE) / PAGE_SIZE;
pages_needed = ALIGN(cap_info->total_size, PAGE_SIZE) / PAGE_SIZE;
if (pages_needed == 0) {
pr_err("invalid capsule size");
@ -84,7 +59,6 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info,
return ret;
}
cap_info->total_size = cap_info->header.imagesize;
temp_page = krealloc(cap_info->pages,
pages_needed * sizeof(void *),
GFP_KERNEL | __GFP_ZERO);
@ -96,6 +70,30 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info,
return 0;
}
/**
* efi_capsule_setup_info - obtain the efi capsule header in the binary and
* setup capsule_info structure
* @cap_info: pointer to current instance of capsule_info structure
* @kbuff: a mapped first page buffer pointer
* @hdr_bytes: the total received number of bytes for efi header
*
* Platforms with non-standard capsule update mechanisms can override
* this __weak function so they can perform any required capsule
* image munging. See quark_quirk_function() for an example.
**/
int __weak efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff,
size_t hdr_bytes)
{
/* Only process data block that is larger than efi header size */
if (hdr_bytes < sizeof(efi_capsule_header_t))
return 0;
memcpy(&cap_info->header, kbuff, sizeof(cap_info->header));
cap_info->total_size = cap_info->header.imagesize;
return __efi_capsule_setup_info(cap_info);
}
/**
* efi_capsule_submit_update - invoke the efi_capsule_update API once binary
* upload done
@ -182,7 +180,7 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
/* Setup capsule binary info structure */
if (cap_info->header.headersize == 0) {
ret = efi_capsule_setup_info(cap_info, kbuff,
ret = efi_capsule_setup_info(cap_info, kbuff - cap_info->count,
cap_info->count + write_byte);
if (ret)
goto fail_unmap;

12
include/linux/efi.h
View File

@ -137,6 +137,18 @@ struct efi_boot_memmap {
#define EFI_CAPSULE_POPULATE_SYSTEM_TABLE 0x00020000
#define EFI_CAPSULE_INITIATE_RESET 0x00040000
struct capsule_info {
efi_capsule_header_t header;
int reset_type;
long index;
size_t count;
size_t total_size;
struct page **pages;
size_t page_bytes_remain;
};
int __efi_capsule_setup_info(struct capsule_info *cap_info);
/*
* Allocation types for calls to boottime->allocate_pages.
*/