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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-06-02 16:52:03 +0300
committerIngo Molnar <mingo@kernel.org>2017-06-05 18:50:41 +0300
commit2a457fb31df62c6b482f78e4f74aaed99271f44d (patch)
treeca361e87b2d0d587942b67279294dcb6e42aa48a /drivers/firmware/efi
parent3fabd628d5ea24b02ddb1230ffca1df0f779f84e (diff)
downloadlinux-2a457fb31df62c6b482f78e4f74aaed99271f44d.tar.xz
efi/capsule-loader: Use page addresses rather than struct page pointers
To give some leeway to code that handles non-standard capsule headers, let's keep an array of page addresses rather than struct page pointers. This gives special implementations of efi_capsule_setup_info() the opportunity to mangle the payload a bit before it is presented to the firmware, without putting any knowledge of the nature of such quirks into the generic code. 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/20170602135207.21708-10-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/firmware/efi')
-rw-r--r--drivers/firmware/efi/capsule-loader.c12
-rw-r--r--drivers/firmware/efi/capsule.c7
2 files changed, 12 insertions, 7 deletions
diff --git a/drivers/firmware/efi/capsule-loader.c b/drivers/firmware/efi/capsule-loader.c
index cbc3526953d5..ec8ac5c4dd84 100644
--- a/drivers/firmware/efi/capsule-loader.c
+++ b/drivers/firmware/efi/capsule-loader.c
@@ -20,6 +20,10 @@
#define NO_FURTHER_WRITE_ACTION -1
+#ifndef phys_to_page
+#define phys_to_page(x) pfn_to_page((x) >> PAGE_SHIFT)
+#endif
+
/**
* efi_free_all_buff_pages - free all previous allocated buffer pages
* @cap_info: pointer to current instance of capsule_info structure
@@ -31,7 +35,7 @@
static void efi_free_all_buff_pages(struct capsule_info *cap_info)
{
while (cap_info->index > 0)
- __free_page(cap_info->pages[--cap_info->index]);
+ __free_page(phys_to_page(cap_info->pages[--cap_info->index]));
cap_info->index = NO_FURTHER_WRITE_ACTION;
}
@@ -161,12 +165,12 @@ static ssize_t efi_capsule_write(struct file *file, const char __user *buff,
goto failed;
}
- cap_info->pages[cap_info->index++] = page;
+ cap_info->pages[cap_info->index++] = page_to_phys(page);
cap_info->page_bytes_remain = PAGE_SIZE;
+ } else {
+ page = phys_to_page(cap_info->pages[cap_info->index - 1]);
}
- page = cap_info->pages[cap_info->index - 1];
-
kbuff = kmap(page);
kbuff += PAGE_SIZE - cap_info->page_bytes_remain;
diff --git a/drivers/firmware/efi/capsule.c b/drivers/firmware/efi/capsule.c
index e603ccf39d80..901b9306bf94 100644
--- a/drivers/firmware/efi/capsule.c
+++ b/drivers/firmware/efi/capsule.c
@@ -214,7 +214,7 @@ efi_capsule_update_locked(efi_capsule_header_t *capsule,
*
* Return 0 on success, a converted EFI status code on failure.
*/
-int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages)
+int efi_capsule_update(efi_capsule_header_t *capsule, phys_addr_t *pages)
{
u32 imagesize = capsule->imagesize;
efi_guid_t guid = capsule->guid;
@@ -249,10 +249,11 @@ int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages)
sglist = kmap(sg_pages[i]);
for (j = 0; j < SGLIST_PER_PAGE && count > 0; j++) {
- u64 sz = min_t(u64, imagesize, PAGE_SIZE);
+ u64 sz = min_t(u64, imagesize,
+ PAGE_SIZE - (u64)*pages % PAGE_SIZE);
sglist[j].length = sz;
- sglist[j].data = page_to_phys(*pages++);
+ sglist[j].data = *pages++;
imagesize -= sz;
count--;