Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 EFI updates from Peter Anvin:
 "This patchset falls under the "maintainers that grovel" clause in the
  v3.18-rc1 announcement.  We had intended to push it late in the merge
  window since we got it into the -tip tree relatively late.

  Many of these are relatively simple things, but there are a couple of
  key bits, especially Ard's and Matt's patches"

* 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits)
  rtc: Disable EFI rtc for x86
  efi: rtc-efi: Export platform:rtc-efi as module alias
  efi: Delete the in_nmi() conditional runtime locking
  efi: Provide a non-blocking SetVariable() operation
  x86/efi: Adding efi_printks on memory allocationa and pci.reads
  x86/efi: Mark initialization code as such
  x86/efi: Update comment regarding required phys mapped EFI services
  x86/efi: Unexport add_efi_memmap variable
  x86/efi: Remove unused efi_call* macros
  efi: Resolve some shadow warnings
  arm64: efi: Format EFI memory type & attrs with efi_md_typeattr_format()
  ia64: efi: Format EFI memory type & attrs with efi_md_typeattr_format()
  x86: efi: Format EFI memory type & attrs with efi_md_typeattr_format()
  efi: Introduce efi_md_typeattr_format()
  efi: Add macro for EFI_MEMORY_UCE memory attribute
  x86/efi: Clear EFI_RUNTIME_SERVICES if failing to enter virtual mode
  arm64/efi: Do not enter virtual mode if booting with efi=noruntime or noefi
  arm64/efi: uefi_init error handling fix
  efi: Add kernel param efi=noruntime
  lib: Add a generic cmdline parse function parse_option_str
  ...

5 files changed, 65 insertions, 45 deletions

diff --git a/arch/x86/platform/efi/efi-bgrt.c b/arch/x86/platform/efi/efi-bgrt.c
index f15103dff4b4..d143d216d52b 100644
--- a/arch/x86/platform/efi/efi-bgrt.c
+++ b/arch/x86/platform/efi/efi-bgrt.c
@@ -40,20 +40,40 @@ void __init efi_bgrt_init(void)
         if (ACPI_FAILURE(status))
                 return;
 
-        if (bgrt_tab->header.length < sizeof(*bgrt_tab))
+        if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
+                pr_err("Ignoring BGRT: invalid length %u (expected %zu)\n",
+                       bgrt_tab->header.length, sizeof(*bgrt_tab));
                 return;
-        if (bgrt_tab->version != 1 || bgrt_tab->status != 1)
+        }
+        if (bgrt_tab->version != 1) {
+                pr_err("Ignoring BGRT: invalid version %u (expected 1)\n",
+                       bgrt_tab->version);
+                return;
+        }
+        if (bgrt_tab->status != 1) {
+                pr_err("Ignoring BGRT: invalid status %u (expected 1)\n",
+                       bgrt_tab->status);
+                return;
+        }
+        if (bgrt_tab->image_type != 0) {
+                pr_err("Ignoring BGRT: invalid image type %u (expected 0)\n",
+                       bgrt_tab->image_type);
                 return;
-        if (bgrt_tab->image_type != 0 || !bgrt_tab->image_address)
+        }
+        if (!bgrt_tab->image_address) {
+                pr_err("Ignoring BGRT: null image address\n");
                 return;
+        }
 
         image = efi_lookup_mapped_addr(bgrt_tab->image_address);
         if (!image) {
                 image = early_memremap(bgrt_tab->image_address,
                                        sizeof(bmp_header));
                 ioremapped = true;
-                if (!image)
+                if (!image) {
+                        pr_err("Ignoring BGRT: failed to map image header memory\n");
                         return;
+                }
         }
 
         memcpy_fromio(&bmp_header, image, sizeof(bmp_header));
@@ -61,14 +81,18 @@ void __init efi_bgrt_init(void)
                 early_iounmap(image, sizeof(bmp_header));
         bgrt_image_size = bmp_header.size;
 
-        bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL);
-        if (!bgrt_image)
+        bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
+        if (!bgrt_image) {
+                pr_err("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
+                       bgrt_image_size);
                 return;
+        }
 
         if (ioremapped) {
                 image = early_memremap(bgrt_tab->image_address,
                                        bmp_header.size);
                 if (!image) {
+                        pr_err("Ignoring BGRT: failed to map image memory\n");
                         kfree(bgrt_image);
                         bgrt_image = NULL;
                         return;
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 850da94fef30..dbc8627a5cdf 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -70,17 +70,7 @@ static efi_config_table_type_t arch_tables[] __initdata = {
 
 u64 efi_setup;          /* efi setup_data physical address */
 
-static bool disable_runtime __initdata = false;
-static int __init setup_noefi(char *arg)
-{
-        disable_runtime = true;
-        return 0;
-}
-early_param("noefi", setup_noefi);
-
-int add_efi_memmap;
-EXPORT_SYMBOL(add_efi_memmap);
-
+static int add_efi_memmap __initdata;
 static int __init setup_add_efi_memmap(char *arg)
 {
         add_efi_memmap = 1;
@@ -96,7 +86,7 @@ static efi_status_t __init phys_efi_set_virtual_address_map(
 {
         efi_status_t status;
 
-        efi_call_phys_prelog();
+        efi_call_phys_prolog();
         status = efi_call_phys(efi_phys.set_virtual_address_map,
                                memory_map_size, descriptor_size,
                                descriptor_version, virtual_map);
@@ -210,9 +200,12 @@ static void __init print_efi_memmap(void)
         for (p = memmap.map, i = 0;
              p < memmap.map_end;
              p += memmap.desc_size, i++) {
+                char buf[64];
+
                 md = p;
-                pr_info("mem%02u: type=%u, attr=0x%llx, range=[0x%016llx-0x%016llx) (%lluMB)\n",
-                        i, md->type, md->attribute, md->phys_addr,
+                pr_info("mem%02u: %s range=[0x%016llx-0x%016llx) (%lluMB)\n",
+                        i, efi_md_typeattr_format(buf, sizeof(buf), md),
+                        md->phys_addr,
                         md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
                         (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
         }
@@ -344,9 +337,9 @@ static int __init efi_runtime_init32(void)
         }
 
         /*
-         * We will only need *early* access to the following two
-         * EFI runtime services before set_virtual_address_map
-         * is invoked.
+         * We will only need *early* access to the SetVirtualAddressMap
+         * EFI runtime service. All other runtime services will be called
+         * via the virtual mapping.
          */
         efi_phys.set_virtual_address_map =
                         (efi_set_virtual_address_map_t *)
@@ -368,9 +361,9 @@ static int __init efi_runtime_init64(void)
         }
 
         /*
-         * We will only need *early* access to the following two
-         * EFI runtime services before set_virtual_address_map
-         * is invoked.
+         * We will only need *early* access to the SetVirtualAddressMap
+         * EFI runtime service. All other runtime services will be called
+         * via the virtual mapping.
          */
         efi_phys.set_virtual_address_map =
                         (efi_set_virtual_address_map_t *)
@@ -492,7 +485,7 @@ void __init efi_init(void)
         if (!efi_runtime_supported())
                 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
         else {
-                if (disable_runtime || efi_runtime_init())
+                if (efi_runtime_disabled() || efi_runtime_init())
                         return;
         }
         if (efi_memmap_init())
@@ -537,7 +530,7 @@ void __init runtime_code_page_mkexec(void)
         }
 }
 
-void efi_memory_uc(u64 addr, unsigned long size)
+void __init efi_memory_uc(u64 addr, unsigned long size)
 {
         unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
         u64 npages;
@@ -732,6 +725,7 @@ static void __init kexec_enter_virtual_mode(void)
          */
         if (!efi_is_native()) {
                 efi_unmap_memmap();
+                clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
                 return;
         }
 
@@ -805,6 +799,7 @@ static void __init __efi_enter_virtual_mode(void)
         new_memmap = efi_map_regions(&count, &pg_shift);
         if (!new_memmap) {
                 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
+                clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
                 return;
         }
 
@@ -812,8 +807,10 @@ static void __init __efi_enter_virtual_mode(void)
 
         BUG_ON(!efi.systab);
 
-        if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift))
+        if (efi_setup_page_tables(__pa(new_memmap), 1 << pg_shift)) {
+                clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
                 return;
+        }
 
         efi_sync_low_kernel_mappings();
         efi_dump_pagetable();
@@ -938,14 +935,11 @@ u64 efi_mem_attributes(unsigned long phys_addr)
         return 0;
 }
 
-static int __init parse_efi_cmdline(char *str)
+static int __init arch_parse_efi_cmdline(char *str)
 {
-        if (*str == '=')
-                str++;
-
-        if (!strncmp(str, "old_map", 7))
+        if (parse_option_str(str, "old_map"))
                 set_bit(EFI_OLD_MEMMAP, &efi.flags);
 
         return 0;
 }
-early_param("efi", parse_efi_cmdline);
+early_param("efi", arch_parse_efi_cmdline);
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c
index 9ee3491e31fb..40e7cda52936 100644
--- a/arch/x86/platform/efi/efi_32.c
+++ b/arch/x86/platform/efi/efi_32.c
@@ -33,7 +33,7 @@
 
 /*
  * To make EFI call EFI runtime service in physical addressing mode we need
- * prelog/epilog before/after the invocation to disable interrupt, to
+ * prolog/epilog before/after the invocation to disable interrupt, to
  * claim EFI runtime service handler exclusively and to duplicate a memory in
  * low memory space say 0 - 3G.
  */
@@ -41,11 +41,13 @@ static unsigned long efi_rt_eflags;
 
 void efi_sync_low_kernel_mappings(void) {}
 void __init efi_dump_pagetable(void) {}
-int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
 {
         return 0;
 }
-void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages) {}
+void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+{
+}
 
 void __init efi_map_region(efi_memory_desc_t *md)
 {
@@ -55,7 +57,7 @@ void __init efi_map_region(efi_memory_desc_t *md)
 void __init efi_map_region_fixed(efi_memory_desc_t *md) {}
 void __init parse_efi_setup(u64 phys_addr, u32 data_len) {}
 
-void efi_call_phys_prelog(void)
+void __init efi_call_phys_prolog(void)
 {
         struct desc_ptr gdt_descr;
 
@@ -69,7 +71,7 @@ void efi_call_phys_prelog(void)
         load_gdt(&gdt_descr);
 }
 
-void efi_call_phys_epilog(void)
+void __init efi_call_phys_epilog(void)
 {
         struct desc_ptr gdt_descr;
 
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index 290d397e1dd9..35aecb6042fb 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -79,7 +79,7 @@ static void __init early_code_mapping_set_exec(int executable)
         }
 }
 
-void __init efi_call_phys_prelog(void)
+void __init efi_call_phys_prolog(void)
 {
         unsigned long vaddress;
         int pgd;
@@ -139,7 +139,7 @@ void efi_sync_low_kernel_mappings(void)
                 sizeof(pgd_t) * num_pgds);
 }
 
-int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
 {
         unsigned long text;
         struct page *page;
@@ -192,7 +192,7 @@ int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages)
         return 0;
 }
 
-void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
+void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages)
 {
         pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
 
diff --git a/arch/x86/platform/efi/efi_stub_32.S b/arch/x86/platform/efi/efi_stub_32.S
index fbe66e626c09..040192b50d02 100644
--- a/arch/x86/platform/efi/efi_stub_32.S
+++ b/arch/x86/platform/efi/efi_stub_32.S
@@ -27,13 +27,13 @@ ENTRY(efi_call_phys)
          * set to 0x0010, DS and SS have been set to 0x0018. In EFI, I found
          * the values of these registers are the same. And, the corresponding
          * GDT entries are identical. So I will do nothing about segment reg
-         * and GDT, but change GDT base register in prelog and epilog.
+         * and GDT, but change GDT base register in prolog and epilog.
          */
 
         /*
          * 1. Now I am running with EIP = <physical address> + PAGE_OFFSET.
          * But to make it smoothly switch from virtual mode to flat mode.
-         * The mapping of lower virtual memory has been created in prelog and
+         * The mapping of lower virtual memory has been created in prolog and
          * epilog.
          */
         movl    $1f, %edx