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Date: Fri, 30 Nov 2018 09:31:47 +0100
From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-efi <linux-efi@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Andy Lutomirski <luto@...nel.org>,
Arend Van Spriel <arend.vanspriel@...adcom.com>,
Bhupesh Sharma <bhsharma@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...el.com>,
Eric Snowberg <eric.snowberg@...cle.com>,
Hans de Goede <hdegoede@...hat.com>,
Joe Perches <joe@...ches.com>,
Jon Hunter <jonathanh@...dia.com>,
Julien Thierry <julien.thierry@....com>,
Marc Zyngier <marc.zyngier@....com>,
Nathan Chancellor <natechancellor@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
"Prakhya, Sai Praneeth" <sai.praneeth.prakhya@...el.com>,
Sedat Dilek <sedat.dilek@...il.com>,
YiFei Zhu <zhuyifei1999@...il.com>
Subject: Re: [PATCH] efi/fdt: More cleanups
On Fri, 30 Nov 2018 at 08:57, Ingo Molnar <mingo@...nel.org> wrote:
>
>
> * Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
>
> > From: Julien Thierry <julien.thierry@....com>
> >
> > Closing bracket seems to end a for statement when it is actually ending
> > the contained if. Add some brackets to have clear delimitation of each
> > scope.
> >
> > No functional change/fix, just fix the indentation.
> >
> > Signed-off-by: Julien Thierry <julien.thierry@....com>
> > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> > ---
> > drivers/firmware/efi/libstub/fdt.c | 5 +++--
> > 1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
> > index 0c0d2312f4a8..a3614f9b5f75 100644
> > --- a/drivers/firmware/efi/libstub/fdt.c
> > +++ b/drivers/firmware/efi/libstub/fdt.c
> > @@ -376,7 +376,7 @@ void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
> > tables = (efi_config_table_t *) sys_table->tables;
> > fdt = NULL;
> >
> > - for (i = 0; i < sys_table->nr_tables; i++)
> > + for (i = 0; i < sys_table->nr_tables; i++) {
> > if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
> > fdt = (void *) tables[i].table;
> > if (fdt_check_header(fdt) != 0) {
> > @@ -385,7 +385,8 @@ void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
> > }
> > *fdt_size = fdt_totalsize(fdt);
> > break;
> > - }
> > + }
> > + }
>
> So if we are doing trivial cleanups, how about the patch below on top? It
> cleans up this file for good. Only minimally build tested.
>
> Thanks,
>
> Ingo
>
> ======================>
> Subject: efi/fdt: More cleanups
> From: Ingo Molnar <mingo@...nel.org>
>
> Apply a number of cleanups:
>
> - Introduce fdt_setprop_*var() helper macros to simplify and shorten repetitive
> sequences - this also makes it less likely that the wrong variable size is
> passed in. This change makes a lot of the property-setting calls single-line
> and easier to read.
>
This change looks fine to me, but scripts/dtc/libfdt/libfdt.h is part
of an external library, so we'd either need to contribute it there or
define the macro in a local header.
> - Harmonize comment style: capitalization, punctuation, whitespaces, etc.
>
> - Fix some whitespace noise in the libstub Makefile which I happened to notice.
>
> - Use the standard tabular initialization style:
>
> - map.map = &runtime_map;
> - map.map_size = &map_size;
> - map.desc_size = &desc_size;
> - map.desc_ver = &desc_ver;
> - map.key_ptr = &mmap_key;
> - map.buff_size = &buff_size;
>
> + map.map = &runtime_map;
> + map.map_size = &map_size;
> + map.desc_size = &desc_size;
> + map.desc_ver = &desc_ver;
> + map.key_ptr = &mmap_key;
> + map.buff_size = &buff_size;
>
> - Use tabular structure definition for better readability.
>
> - Make all pr*() lines single-line, even if they marginally exceed 80 cols - this
> makes them visually less intrusive.
>
> - Unbreak line breaks into single lines when the length exceeds 80 cols only
> marginally, for better readability.
>
> - Move assignment closer to the actual usage site.
>
> - Plus some other smaller cleanups, spelling fixes, etc.
>
> No change in functionality intended.
>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
Thanks for the cleanup. I will merge it once we decide where to define
the new helper macros.
> ---
> drivers/firmware/efi/libstub/Makefile | 4 -
> drivers/firmware/efi/libstub/fdt.c | 109 ++++++++++++++++------------------
> scripts/dtc/libfdt/libfdt.h | 10 +++
> 3 files changed, 64 insertions(+), 59 deletions(-)
>
> Index: tip/drivers/firmware/efi/libstub/Makefile
> ===================================================================
> --- tip.orig/drivers/firmware/efi/libstub/Makefile
> +++ tip/drivers/firmware/efi/libstub/Makefile
> @@ -49,7 +49,7 @@ lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o
>
> lib-$(CONFIG_ARM) += arm32-stub.o
> lib-$(CONFIG_ARM64) += arm64-stub.o
> -CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
> +CFLAGS_arm64-stub.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
>
> #
> # arm64 puts the stub in the kernel proper, which will unnecessarily retain all
> @@ -86,7 +86,7 @@ quiet_cmd_stubcopy = STUBCPY $@
> cmd_stubcopy = if $(STRIP) --strip-debug $(STUBCOPY_RM-y) -o $@ $<; \
> then if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); \
> then (echo >&2 "$@: absolute symbol references not allowed in the EFI stub"; \
> - rm -f $@; /bin/false); \
> + rm -f $@; /bin/false); \
> else $(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@; fi \
> else /bin/false; fi
>
> Index: tip/drivers/firmware/efi/libstub/fdt.c
> ===================================================================
> --- tip.orig/drivers/firmware/efi/libstub/fdt.c
> +++ tip/drivers/firmware/efi/libstub/fdt.c
> @@ -26,10 +26,8 @@ static void fdt_update_cell_size(efi_sys
> offset = fdt_path_offset(fdt, "/");
> /* Set the #address-cells and #size-cells values for an empty tree */
>
> - fdt_setprop_u32(fdt, offset, "#address-cells",
> - EFI_DT_ADDR_CELLS_DEFAULT);
> -
> - fdt_setprop_u32(fdt, offset, "#size-cells", EFI_DT_SIZE_CELLS_DEFAULT);
> + fdt_setprop_u32(fdt, offset, "#address-cells", EFI_DT_ADDR_CELLS_DEFAULT);
> + fdt_setprop_u32(fdt, offset, "#size-cells", EFI_DT_SIZE_CELLS_DEFAULT);
> }
>
> static efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
> @@ -42,7 +40,7 @@ static efi_status_t update_fdt(efi_syste
> u32 fdt_val32;
> u64 fdt_val64;
>
> - /* Do some checks on provided FDT, if it exists*/
> + /* Do some checks on provided FDT, if it exists: */
> if (orig_fdt) {
> if (fdt_check_header(orig_fdt)) {
> pr_efi_err(sys_table, "Device Tree header not valid!\n");
> @@ -50,7 +48,7 @@ static efi_status_t update_fdt(efi_syste
> }
> /*
> * We don't get the size of the FDT if we get if from a
> - * configuration table.
> + * configuration table:
> */
> if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
> pr_efi_err(sys_table, "Truncated device tree! foo!\n");
> @@ -64,8 +62,8 @@ static efi_status_t update_fdt(efi_syste
> status = fdt_create_empty_tree(fdt, new_fdt_size);
> if (status == 0) {
> /*
> - * Any failure from the following function is non
> - * critical
> + * Any failure from the following function is
> + * non-critical:
> */
> fdt_update_cell_size(sys_table, fdt);
> }
> @@ -86,12 +84,13 @@ static efi_status_t update_fdt(efi_syste
> if (node < 0) {
> node = fdt_add_subnode(fdt, 0, "chosen");
> if (node < 0) {
> - status = node; /* node is error code when negative */
> + /* 'node' is an error code when negative: */
> + status = node;
> goto fdt_set_fail;
> }
> }
>
> - if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
> + if (cmdline_ptr != NULL && strlen(cmdline_ptr) > 0) {
> status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
> strlen(cmdline_ptr) + 1);
> if (status)
> @@ -103,13 +102,12 @@ static efi_status_t update_fdt(efi_syste
> u64 initrd_image_end;
> u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
>
> - status = fdt_setprop(fdt, node, "linux,initrd-start",
> - &initrd_image_start, sizeof(u64));
> + status = fdt_setprop_var(fdt, node, "linux,initrd-start", initrd_image_start);
> if (status)
> goto fdt_set_fail;
> +
> initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
> - status = fdt_setprop(fdt, node, "linux,initrd-end",
> - &initrd_image_end, sizeof(u64));
> + status = fdt_setprop_var(fdt, node, "linux,initrd-end", initrd_image_end);
> if (status)
> goto fdt_set_fail;
> }
> @@ -117,30 +115,28 @@ static efi_status_t update_fdt(efi_syste
> /* Add FDT entries for EFI runtime services in chosen node. */
> node = fdt_subnode_offset(fdt, 0, "chosen");
> fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
> - status = fdt_setprop(fdt, node, "linux,uefi-system-table",
> - &fdt_val64, sizeof(fdt_val64));
> +
> + status = fdt_setprop_var(fdt, node, "linux,uefi-system-table", fdt_val64);
> if (status)
> goto fdt_set_fail;
>
> fdt_val64 = U64_MAX; /* placeholder */
> - status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
> - &fdt_val64, sizeof(fdt_val64));
> +
> + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-start", fdt_val64);
> if (status)
> goto fdt_set_fail;
>
> fdt_val32 = U32_MAX; /* placeholder */
> - status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
> - &fdt_val32, sizeof(fdt_val32));
> +
> + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-size", fdt_val32);
> if (status)
> goto fdt_set_fail;
>
> - status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
> - &fdt_val32, sizeof(fdt_val32));
> + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32);
> if (status)
> goto fdt_set_fail;
>
> - status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
> - &fdt_val32, sizeof(fdt_val32));
> + status = fdt_setprop_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32);
> if (status)
> goto fdt_set_fail;
>
> @@ -150,8 +146,7 @@ static efi_status_t update_fdt(efi_syste
> efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
> (u8 *)&fdt_val64);
> if (efi_status == EFI_SUCCESS) {
> - status = fdt_setprop(fdt, node, "kaslr-seed",
> - &fdt_val64, sizeof(fdt_val64));
> + status = fdt_setprop_var(fdt, node, "kaslr-seed", fdt_val64);
> if (status)
> goto fdt_set_fail;
> } else if (efi_status != EFI_NOT_FOUND) {
> @@ -159,7 +154,7 @@ static efi_status_t update_fdt(efi_syste
> }
> }
>
> - /* shrink the FDT back to its minimum size */
> + /* Shrink the FDT back to its minimum size: */
> fdt_pack(fdt);
>
> return EFI_SUCCESS;
> @@ -182,26 +177,26 @@ static efi_status_t update_fdt_memmap(vo
> return EFI_LOAD_ERROR;
>
> fdt_val64 = cpu_to_fdt64((unsigned long)*map->map);
> - err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-start",
> - &fdt_val64, sizeof(fdt_val64));
> +
> + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-start", fdt_val64);
> if (err)
> return EFI_LOAD_ERROR;
>
> fdt_val32 = cpu_to_fdt32(*map->map_size);
> - err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-size",
> - &fdt_val32, sizeof(fdt_val32));
> +
> + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-size", fdt_val32);
> if (err)
> return EFI_LOAD_ERROR;
>
> fdt_val32 = cpu_to_fdt32(*map->desc_size);
> - err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-size",
> - &fdt_val32, sizeof(fdt_val32));
> +
> + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-size", fdt_val32);
> if (err)
> return EFI_LOAD_ERROR;
>
> fdt_val32 = cpu_to_fdt32(*map->desc_ver);
> - err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-ver",
> - &fdt_val32, sizeof(fdt_val32));
> +
> + err = fdt_setprop_inplace_var(fdt, node, "linux,uefi-mmap-desc-ver", fdt_val32);
> if (err)
> return EFI_LOAD_ERROR;
>
> @@ -209,13 +204,13 @@ static efi_status_t update_fdt_memmap(vo
> }
>
> #ifndef EFI_FDT_ALIGN
> -#define EFI_FDT_ALIGN EFI_PAGE_SIZE
> +# define EFI_FDT_ALIGN EFI_PAGE_SIZE
> #endif
>
> struct exit_boot_struct {
> - efi_memory_desc_t *runtime_map;
> - int *runtime_entry_count;
> - void *new_fdt_addr;
> + efi_memory_desc_t *runtime_map;
> + int *runtime_entry_count;
> + void *new_fdt_addr;
> };
>
> static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
> @@ -235,7 +230,7 @@ static efi_status_t exit_boot_func(efi_s
> }
>
> #ifndef MAX_FDT_SIZE
> -#define MAX_FDT_SIZE SZ_2M
> +# define MAX_FDT_SIZE SZ_2M
> #endif
>
> /*
> @@ -266,16 +261,16 @@ efi_status_t allocate_new_fdt_and_exit_b
> unsigned long mmap_key;
> efi_memory_desc_t *memory_map, *runtime_map;
> efi_status_t status;
> - int runtime_entry_count = 0;
> + int runtime_entry_count;
> struct efi_boot_memmap map;
> struct exit_boot_struct priv;
>
> - map.map = &runtime_map;
> - map.map_size = &map_size;
> - map.desc_size = &desc_size;
> - map.desc_ver = &desc_ver;
> - map.key_ptr = &mmap_key;
> - map.buff_size = &buff_size;
> + map.map = &runtime_map;
> + map.map_size = &map_size;
> + map.desc_size = &desc_size;
> + map.desc_ver = &desc_ver;
> + map.key_ptr = &mmap_key;
> + map.buff_size = &buff_size;
>
> /*
> * Get a copy of the current memory map that we will use to prepare
> @@ -289,15 +284,13 @@ efi_status_t allocate_new_fdt_and_exit_b
> return status;
> }
>
> - pr_efi(sys_table,
> - "Exiting boot services and installing virtual address map...\n");
> + pr_efi(sys_table, "Exiting boot services and installing virtual address map...\n");
>
> map.map = &memory_map;
> status = efi_high_alloc(sys_table, MAX_FDT_SIZE, EFI_FDT_ALIGN,
> new_fdt_addr, max_addr);
> if (status != EFI_SUCCESS) {
> - pr_efi_err(sys_table,
> - "Unable to allocate memory for new device tree.\n");
> + pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
> goto fail;
> }
>
> @@ -318,11 +311,12 @@ efi_status_t allocate_new_fdt_and_exit_b
> goto fail_free_new_fdt;
> }
>
> - priv.runtime_map = runtime_map;
> - priv.runtime_entry_count = &runtime_entry_count;
> - priv.new_fdt_addr = (void *)*new_fdt_addr;
> - status = efi_exit_boot_services(sys_table, handle, &map, &priv,
> - exit_boot_func);
> + runtime_entry_count = 0;
> + priv.runtime_map = runtime_map;
> + priv.runtime_entry_count = &runtime_entry_count;
> + priv.new_fdt_addr = (void *)*new_fdt_addr;
> +
> + status = efi_exit_boot_services(sys_table, handle, &map, &priv, exit_boot_func);
>
> if (status == EFI_SUCCESS) {
> efi_set_virtual_address_map_t *svam;
> @@ -363,6 +357,7 @@ fail_free_new_fdt:
>
> fail:
> sys_table->boottime->free_pool(runtime_map);
> +
> return EFI_LOAD_ERROR;
> }
>
> @@ -373,7 +368,7 @@ void *get_fdt(efi_system_table_t *sys_ta
> void *fdt;
> int i;
>
> - tables = (efi_config_table_t *) sys_table->tables;
> + tables = (efi_config_table_t *)sys_table->tables;
> fdt = NULL;
>
> for (i = 0; i < sys_table->nr_tables; i++) {
> Index: tip/scripts/dtc/libfdt/libfdt.h
> ===================================================================
> --- tip.orig/scripts/dtc/libfdt/libfdt.h
> +++ tip/scripts/dtc/libfdt/libfdt.h
> @@ -1213,8 +1213,14 @@ int fdt_setprop_inplace_namelen_partial(
> * -FDT_ERR_TRUNCATED, standard meanings
> */
> #ifndef SWIG /* Not available in Python */
> +
> int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
> const void *val, int len);
> +
> +/* Helper macro for the usual case of using simple C variables: */
> +#define fdt_setprop_inplace_var(fdt, node_offset, name, var) \
> + fdt_setprop_inplace((fdt), (node_offset), (name), &(var), sizeof(var))
> +
> #endif
>
> /**
> @@ -1540,6 +1546,10 @@ int fdt_setprop(void *fdt, int nodeoffse
> int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
> int len, void **prop_data);
>
> +/* Helper macro for the usual case of using simple C variables: */
> +#define fdt_setprop_var(fdt, node_offset, name, var) \
> + fdt_setprop((fdt), (node_offset), (name), &(var), sizeof(var))
> +
> /**
> * fdt_setprop_u32 - set a property to a 32-bit integer
> * @fdt: pointer to the device tree blob
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