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SubjectRe: [PATCH 02/11] efi: Remove EFI_PAGE_SHIFT and EFI_PAGE_SIZE
On Thu, 19 Sep, at 04:54:45PM, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> ... and use the good old standard defines which we all know. Also,
> simplify math to shift by PAGE_SHIFT instead of multiplying by
> PAGE_SIZE.
>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> ---
> arch/x86/boot/compressed/eboot.c | 12 ++++++------
> arch/x86/boot/compressed/eboot.h | 1 -
> arch/x86/platform/efi/efi.c | 22 +++++++++++-----------
> include/linux/efi.h | 6 ++----
> 4 files changed, 19 insertions(+), 22 deletions(-)

I'm pulling in Leif and Roy just so they're aware of this change,
because while PAGE_SHIFT is always 12 on x86, that's not true for arm64.

However, I imagine that much work would be needed to allow for page
sizes other than 4K, so I am definitely going to take this patch.

> diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
> index b7388a425f09..5c440bf769a8 100644
> --- a/arch/x86/boot/compressed/eboot.c
> +++ b/arch/x86/boot/compressed/eboot.c
> @@ -96,7 +96,7 @@ static efi_status_t high_alloc(unsigned long size, unsigned long align,
> if (status != EFI_SUCCESS)
> goto fail;
>
> - nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
> + nr_pages = round_up(size, PAGE_SIZE) / PAGE_SIZE;
> again:
> for (i = 0; i < map_size / desc_size; i++) {
> efi_memory_desc_t *desc;
> @@ -111,7 +111,7 @@ again:
> continue;
>
> start = desc->phys_addr;
> - end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
> + end = start + (desc->num_pages << PAGE_SHIFT);
>
> if ((start + size) > end || (start + size) > max)
> continue;
> @@ -173,7 +173,7 @@ static efi_status_t low_alloc(unsigned long size, unsigned long align,
> if (status != EFI_SUCCESS)
> goto fail;
>
> - nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
> + nr_pages = round_up(size, PAGE_SIZE) / PAGE_SIZE;
> for (i = 0; i < map_size / desc_size; i++) {
> efi_memory_desc_t *desc;
> unsigned long m = (unsigned long)map;
> @@ -188,7 +188,7 @@ static efi_status_t low_alloc(unsigned long size, unsigned long align,
> continue;
>
> start = desc->phys_addr;
> - end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
> + end = start + (desc->num_pages << PAGE_SHIFT);
>
> /*
> * Don't allocate at 0x0. It will confuse code that
> @@ -224,7 +224,7 @@ static void low_free(unsigned long size, unsigned long addr)
> {
> unsigned long nr_pages;
>
> - nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
> + nr_pages = round_up(size, PAGE_SIZE) / PAGE_SIZE;
> efi_call_phys2(sys_table->boottime->free_pages, addr, nr_pages);
> }
>
> @@ -1128,7 +1128,7 @@ static efi_status_t relocate_kernel(struct setup_header *hdr)
> * possible.
> */
> start = hdr->pref_address;
> - nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
> + nr_pages = round_up(hdr->init_size, PAGE_SIZE) / PAGE_SIZE;
>
> status = efi_call_phys4(sys_table->boottime->allocate_pages,
> EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
> diff --git a/arch/x86/boot/compressed/eboot.h b/arch/x86/boot/compressed/eboot.h
> index e5b0a8f91c5f..786398c1bb9a 100644
> --- a/arch/x86/boot/compressed/eboot.h
> +++ b/arch/x86/boot/compressed/eboot.h
> @@ -11,7 +11,6 @@
>
> #define DESC_TYPE_CODE_DATA (1 << 0)
>
> -#define EFI_PAGE_SIZE (1UL << EFI_PAGE_SHIFT)
> #define EFI_READ_CHUNK_SIZE (1024 * 1024)
>
> #define EFI_CONSOLE_OUT_DEVICE_GUID \
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 7cec1e9e5494..538c1e6b7b2c 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -339,7 +339,7 @@ static void __init do_add_efi_memmap(void)
> for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
> efi_memory_desc_t *md = p;
> unsigned long long start = md->phys_addr;
> - unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
> + unsigned long long size = md->num_pages << PAGE_SHIFT;
> int e820_type;
>
> switch (md->type) {
> @@ -416,8 +416,8 @@ static void __init print_efi_memmap(void)
> pr_info("mem%02u: type=%u, attr=0x%llx, "
> "range=[0x%016llx-0x%016llx) (%lluMB)\n",
> i, md->type, md->attribute, md->phys_addr,
> - md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
> - (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
> + md->phys_addr + (md->num_pages << PAGE_SHIFT),
> + (md->num_pages >> (20 - PAGE_SHIFT)));
> }
> #endif /* EFI_DEBUG */
> }
> @@ -429,7 +429,7 @@ void __init efi_reserve_boot_services(void)
> for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
> efi_memory_desc_t *md = p;
> u64 start = md->phys_addr;
> - u64 size = md->num_pages << EFI_PAGE_SHIFT;
> + u64 size = md->num_pages << PAGE_SHIFT;
>
> if (md->type != EFI_BOOT_SERVICES_CODE &&
> md->type != EFI_BOOT_SERVICES_DATA)
> @@ -473,7 +473,7 @@ void __init efi_free_boot_services(void)
> for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
> efi_memory_desc_t *md = p;
> unsigned long long start = md->phys_addr;
> - unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
> + unsigned long long size = md->num_pages << PAGE_SHIFT;
>
> if (md->type != EFI_BOOT_SERVICES_CODE &&
> md->type != EFI_BOOT_SERVICES_DATA)
> @@ -825,7 +825,7 @@ void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
> return NULL;
> for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
> efi_memory_desc_t *md = p;
> - u64 size = md->num_pages << EFI_PAGE_SHIFT;
> + u64 size = md->num_pages << PAGE_SHIFT;
> u64 end = md->phys_addr + size;
> if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
> md->type != EFI_BOOT_SERVICES_CODE &&
> @@ -843,7 +843,7 @@ void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
>
> void efi_memory_uc(u64 addr, unsigned long size)
> {
> - unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
> + unsigned long page_shift = 1UL << PAGE_SHIFT;
> u64 npages;
>
> npages = round_up(size, page_shift) / page_shift;
> @@ -896,7 +896,7 @@ void __init efi_enter_virtual_mode(void)
> continue;
> }
>
> - prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
> + prev_size = prev_md->num_pages << PAGE_SHIFT;
>
> if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
> prev_md->num_pages += md->num_pages;
> @@ -914,7 +914,7 @@ void __init efi_enter_virtual_mode(void)
> md->type != EFI_BOOT_SERVICES_DATA)
> continue;
>
> - size = md->num_pages << EFI_PAGE_SHIFT;
> + size = md->num_pages << PAGE_SHIFT;
> end = md->phys_addr + size;
>
> start_pfn = PFN_DOWN(md->phys_addr);
> @@ -1011,7 +1011,7 @@ u32 efi_mem_type(unsigned long phys_addr)
> md = p;
> if ((md->phys_addr <= phys_addr) &&
> (phys_addr < (md->phys_addr +
> - (md->num_pages << EFI_PAGE_SHIFT))))
> + (md->num_pages << PAGE_SHIFT))))
> return md->type;
> }
> return 0;
> @@ -1026,7 +1026,7 @@ u64 efi_mem_attributes(unsigned long phys_addr)
> md = p;
> if ((md->phys_addr <= phys_addr) &&
> (phys_addr < (md->phys_addr +
> - (md->num_pages << EFI_PAGE_SHIFT))))
> + (md->num_pages << PAGE_SHIFT))))
> return md->attribute;
> }
> return 0;
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 5f8f176154f7..fa47d80ab4b5 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -95,8 +95,6 @@ typedef struct {
> #define EFI_MEMORY_RUNTIME ((u64)0x8000000000000000ULL) /* range requires runtime mapping */
> #define EFI_MEMORY_DESCRIPTOR_VERSION 1
>
> -#define EFI_PAGE_SHIFT 12
> -
> typedef struct {
> u32 type;
> u32 pad;
> @@ -611,7 +609,7 @@ static inline int efi_range_is_wc(unsigned long start, unsigned long len)
> {
> unsigned long i;
>
> - for (i = 0; i < len; i += (1UL << EFI_PAGE_SHIFT)) {
> + for (i = 0; i < len; i += PAGE_SIZE) {
> unsigned long paddr = __pa(start + i);
> if (!(efi_mem_attributes(paddr) & EFI_MEMORY_WC))
> return 0;
> @@ -728,7 +726,7 @@ struct efi_generic_dev_path {
>
> static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
> {
> - *npages = PFN_UP(*addr + (*npages<<EFI_PAGE_SHIFT)) - PFN_DOWN(*addr);
> + *npages = PFN_UP(*addr + (*npages << PAGE_SHIFT)) - PFN_DOWN(*addr);
> *addr &= PAGE_MASK;
> }
>
> --
> 1.8.4
>

--
Matt Fleming, Intel Open Source Technology Center


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