[PATCH 0/4] Make commonly useful UEFI functions common

[PATCH 0/4] Make commonly useful UEFI functions common

[Leif Lindholm]

This set breaks out some common code from x86/ia64 EFI support
code and puts it into drivers/firmware/efi.

First it takes the definition of the global "efi" data structure
and moves it into global efi.c. Then it implements a common version
of efi_config_init().

Secondly it breaks the efi_lookup_mapped_addr() function out of x86
and places it in global efi.c, for shared use with future ARM
patches.

IA64 code compile tested only.

Pardon the delay in getting this out - back to back conferences
followed by a bad case of the man flu.

Leif Lindholm (4):
  efi: provide a generic efi_config_init()
  efi: x86: use common code for (U)EFI configuration scanning
  efi: ia64: use common code for (U)EFI configuration scanning
  efi: x86: make efi_lookup_mapped_addr() a common function

 arch/ia64/include/asm/io.h  |    1 +
 arch/ia64/kernel/efi.c      |   54 ++++-------------
 arch/x86/platform/efi/efi.c |  124 +++------------------------------------
 drivers/firmware/efi/efi.c  |  136 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/efi.h         |    7 +++
 5 files changed, 163 insertions(+), 159 deletions(-)

-- 
1.7.10.4

[PATCH 1/4] efi: provide a generic efi_config_init()

[Leif Lindholm]

Common to (U)EFI support on all platforms is the global "efi" data
structure, and the code that parses the System Table to locate
addresses to populate that structure with.

This patch adds both of these to the global EFI driver code.

Since existing code for both x86 and ia64 contained handling of
tables specific to the respective platform, efi_config_init()
takes an optional pointer to a list of valid architecture-specific 
tables and pointers to populate on comparison hit.

Patches removing the original platform-specific code and moving
those platforms to using the below code follow later in the series.

Note: use of early_memremap() instead of early_ioremap() for better
semantic match for ARM support.

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 drivers/firmware/efi/efi.c |  106 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/efi.h        |    7 +++
 2 files changed, 113 insertions(+)

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 5145fa3..4fa944a 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -18,6 +18,20 @@
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/efi.h>
+#include <linux/io.h>
+
+struct efi __read_mostly efi = {
+	.mps        = EFI_INVALID_TABLE_ADDR,
+	.acpi       = EFI_INVALID_TABLE_ADDR,
+	.acpi20     = EFI_INVALID_TABLE_ADDR,
+	.smbios     = EFI_INVALID_TABLE_ADDR,
+	.sal_systab = EFI_INVALID_TABLE_ADDR,
+	.boot_info  = EFI_INVALID_TABLE_ADDR,
+	.hcdp       = EFI_INVALID_TABLE_ADDR,
+	.uga        = EFI_INVALID_TABLE_ADDR,
+	.uv_systab  = EFI_INVALID_TABLE_ADDR,
+};
+EXPORT_SYMBOL(efi);
 
 static struct kobject *efi_kobj;
 static struct kobject *efivars_kobj;
@@ -132,3 +146,95 @@ err_put:
 }
 
 subsys_initcall(efisubsys_init);
+
+
+static __initdata efi_config_table_type_t common_tables[] = {
+	{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
+	{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
+	{HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
+	{MPS_TABLE_GUID, "MPS", &efi.mps},
+	{SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
+	{SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
+	{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
+	{NULL_GUID, NULL, 0},
+};
+
+static __init int match_config_table(efi_guid_t *guid,
+				     unsigned long table,
+				     efi_config_table_type_t *table_types)
+{
+	u8 str[38];
+	int i;
+
+	if (table_types) {
+		efi_guid_unparse(guid, str);
+
+		for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
+			efi_guid_unparse(&table_types[i].guid, str);
+
+			if (!efi_guidcmp(*guid, table_types[i].guid)) {
+				*(table_types[i].ptr) = table;
+				pr_cont(" %s=0x%lx ",
+					table_types[i].name, table);
+				return 1;
+			}
+		}
+	}
+
+	return 0;
+}
+
+int __init efi_config_init(efi_config_table_type_t *arch_tables)
+{
+	void *config_tables, *tablep;
+	int i, sz;
+
+	if (efi_enabled(EFI_64BIT))
+		sz = sizeof(efi_config_table_64_t);
+	else
+		sz = sizeof(efi_config_table_32_t);
+
+	/*
+	 * Let's see what config tables the firmware passed to us.
+	 */
+	config_tables = early_memremap(efi.systab->tables,
+				       efi.systab->nr_tables * sz);
+	if (config_tables = NULL) {
+		pr_err("Could not map Configuration table!\n");
+		return -ENOMEM;
+	}
+
+	tablep = config_tables;
+	pr_info("");
+	for (i = 0; i < efi.systab->nr_tables; i++) {
+		efi_guid_t guid;
+		unsigned long table;
+
+		if (efi_enabled(EFI_64BIT)) {
+			u64 table64;
+			guid = ((efi_config_table_64_t *)tablep)->guid;
+			table64 = ((efi_config_table_64_t *)tablep)->table;
+			table = table64;
+#ifndef CONFIG_64BIT
+			if (table64 >> 32) {
+				pr_cont("\n");
+				pr_err("Table located above 4GB, disabling EFI.\n");
+				early_iounmap(config_tables,
+					       efi.systab->nr_tables * sz);
+				return -EINVAL;
+			}
+#endif
+		} else {
+			guid = ((efi_config_table_32_t *)tablep)->guid;
+			table = ((efi_config_table_32_t *)tablep)->table;
+		}
+
+		if (!match_config_table(&guid, table, common_tables))
+			match_config_table(&guid, table, arch_tables);
+
+		tablep += sz;
+	}
+	pr_cont("\n");
+	early_iounmap(config_tables, efi.systab->nr_tables * sz);
+	return 0;
+}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 5f8f176..09d9e42 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -404,6 +404,12 @@ typedef struct {
 	unsigned long table;
 } efi_config_table_t;
 
+typedef struct {
+	efi_guid_t guid;
+	const char *name;
+	unsigned long *ptr;
+} efi_config_table_type_t;
+
 #define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
 
 #define EFI_2_30_SYSTEM_TABLE_REVISION  ((2 << 16) | (30))
@@ -587,6 +593,7 @@ static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned lon
 }
 #endif
 extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr);
+extern int efi_config_init(efi_config_table_type_t *arch_tables);
 extern u64 efi_get_iobase (void);
 extern u32 efi_mem_type (unsigned long phys_addr);
 extern u64 efi_mem_attributes (unsigned long phys_addr);
-- 
1.7.10.4

Re: [PATCH 1/4] efi: provide a generic efi_config_init()

[Tony Luck]

On Tue, Jul 30, 2013 at 9:47 AM, Leif Lindholm <leif.lindholm@linaro.org> wrote:
> +       /*
> +        * Let's see what config tables the firmware passed to us.
> +        */
> +       config_tables = early_mememap(efi.systab->tables,
> +                                      efi.systab->nr_tables * sz);

Breaks bisection on ia64 ... you use early_mememap() here, but don't
define it on ia64 until patch 3/4.  So I get:

drivers/firmware/efi/efi.c: In function 'efi_config_init':
drivers/firmware/efi/efi.c:200: error: implicit declaration of
function 'early_memremap'
drivers/firmware/efi/efi.c:201: warning: assignment makes pointer from
integer without a cast

-Tony

Re: [PATCH 1/4] efi: provide a generic efi_config_init()

[Leif Lindholm]

On Tue, Jul 30, 2013 at 10:53:10AM -0700, Tony Luck wrote:
> On Tue, Jul 30, 2013 at 9:47 AM, Leif Lindholm <leif.lindholm@linaro.org> wrote:
> > +       /*
> > +        * Let's see what config tables the firmware passed to us.
> > +        */
> > +       config_tables = early_mememap(efi.systab->tables,
> > +                                      efi.systab->nr_tables * sz);
> 
> Breaks bisection on ia64 ... you use early_mememap() here, but don't
> define it on ia64 until patch 3/4.  So I get:

Ugh, OK.

So I guess the clean way to deal with that would be to make the
memremap definition a separate patch?

/
    Leif

Re: [PATCH 1/4] efi: provide a generic efi_config_init()

[Tony Luck]

On Tue, Jul 30, 2013 at 11:02 AM, Leif Lindholm
<leif.lindholm@linaro.org> wrote:
> So I guess the clean way to deal with that would be to make the
> memremap definition a separate patch?

Or just pull:
+#define early_memremap(phys_addr, size)        early_ioremap(phys_addr, size)
out of part 3 and put it into part1 (along with some of the commit commentary).

-Tony

[PATCH 2/4] efi: x86: use common code for (U)EFI configuration scanning

[Leif Lindholm]

This patch makes x86 use the new common code for EFI configuration
table scanning. It also removes the local definition of the global
"efi" data structure.

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 arch/x86/platform/efi/efi.c |   96 ++++---------------------------------------
 1 file changed, 8 insertions(+), 88 deletions(-)

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 90f6ed1..ed2be58 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -60,19 +60,6 @@
 
 static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
 
-struct efi __read_mostly efi = {
-	.mps        = EFI_INVALID_TABLE_ADDR,
-	.acpi       = EFI_INVALID_TABLE_ADDR,
-	.acpi20     = EFI_INVALID_TABLE_ADDR,
-	.smbios     = EFI_INVALID_TABLE_ADDR,
-	.sal_systab = EFI_INVALID_TABLE_ADDR,
-	.boot_info  = EFI_INVALID_TABLE_ADDR,
-	.hcdp       = EFI_INVALID_TABLE_ADDR,
-	.uga        = EFI_INVALID_TABLE_ADDR,
-	.uv_systab  = EFI_INVALID_TABLE_ADDR,
-};
-EXPORT_SYMBOL(efi);
-
 struct efi_memory_map memmap;
 
 static struct efi efi_phys __initdata;
@@ -80,6 +67,13 @@ static efi_system_table_t efi_systab __initdata;
 
 unsigned long x86_efi_facility;
 
+static __initdata efi_config_table_type_t arch_tables[] = {
+#ifdef CONFIG_X86_UV
+	{UV_SYSTEM_TABLE_GUID, "UVsystab", &efi.uv_systab},
+#endif
+	{NULL_GUID, NULL, 0},
+};
+
 /*
  * Returns 1 if 'facility' is enabled, 0 otherwise.
  */
@@ -578,80 +572,6 @@ static int __init efi_systab_init(void *phys)
 	return 0;
 }
 
-static int __init efi_config_init(u64 tables, int nr_tables)
-{
-	void *config_tables, *tablep;
-	int i, sz;
-
-	if (efi_enabled(EFI_64BIT))
-		sz = sizeof(efi_config_table_64_t);
-	else
-		sz = sizeof(efi_config_table_32_t);
-
-	/*
-	 * Let's see what config tables the firmware passed to us.
-	 */
-	config_tables = early_ioremap(tables, nr_tables * sz);
-	if (config_tables = NULL) {
-		pr_err("Could not map Configuration table!\n");
-		return -ENOMEM;
-	}
-
-	tablep = config_tables;
-	pr_info("");
-	for (i = 0; i < efi.systab->nr_tables; i++) {
-		efi_guid_t guid;
-		unsigned long table;
-
-		if (efi_enabled(EFI_64BIT)) {
-			u64 table64;
-			guid = ((efi_config_table_64_t *)tablep)->guid;
-			table64 = ((efi_config_table_64_t *)tablep)->table;
-			table = table64;
-#ifdef CONFIG_X86_32
-			if (table64 >> 32) {
-				pr_cont("\n");
-				pr_err("Table located above 4GB, disabling EFI.\n");
-				early_iounmap(config_tables,
-					      efi.systab->nr_tables * sz);
-				return -EINVAL;
-			}
-#endif
-		} else {
-			guid = ((efi_config_table_32_t *)tablep)->guid;
-			table = ((efi_config_table_32_t *)tablep)->table;
-		}
-		if (!efi_guidcmp(guid, MPS_TABLE_GUID)) {
-			efi.mps = table;
-			pr_cont(" MPS=0x%lx ", table);
-		} else if (!efi_guidcmp(guid, ACPI_20_TABLE_GUID)) {
-			efi.acpi20 = table;
-			pr_cont(" ACPI 2.0=0x%lx ", table);
-		} else if (!efi_guidcmp(guid, ACPI_TABLE_GUID)) {
-			efi.acpi = table;
-			pr_cont(" ACPI=0x%lx ", table);
-		} else if (!efi_guidcmp(guid, SMBIOS_TABLE_GUID)) {
-			efi.smbios = table;
-			pr_cont(" SMBIOS=0x%lx ", table);
-#ifdef CONFIG_X86_UV
-		} else if (!efi_guidcmp(guid, UV_SYSTEM_TABLE_GUID)) {
-			efi.uv_systab = table;
-			pr_cont(" UVsystab=0x%lx ", table);
-#endif
-		} else if (!efi_guidcmp(guid, HCDP_TABLE_GUID)) {
-			efi.hcdp = table;
-			pr_cont(" HCDP=0x%lx ", table);
-		} else if (!efi_guidcmp(guid, UGA_IO_PROTOCOL_GUID)) {
-			efi.uga = table;
-			pr_cont(" UGA=0x%lx ", table);
-		}
-		tablep += sz;
-	}
-	pr_cont("\n");
-	early_iounmap(config_tables, efi.systab->nr_tables * sz);
-	return 0;
-}
-
 static int __init efi_runtime_init(void)
 {
 	efi_runtime_services_t *runtime;
@@ -745,7 +665,7 @@ void __init efi_init(void)
 		efi.systab->hdr.revision >> 16,
 		efi.systab->hdr.revision & 0xffff, vendor);
 
-	if (efi_config_init(efi.systab->tables, efi.systab->nr_tables))
+	if (efi_config_init(arch_tables))
 		return;
 
 	set_bit(EFI_CONFIG_TABLES, &x86_efi_facility);
-- 
1.7.10.4

[PATCH 3/4] efi: ia64: use common code for (U)EFI configuration scanning

[Leif Lindholm]

This patch makes ia64 use the new common code for configuration
table scanning. It also removes the local definition of the global
"efi" data structure.

Introduces an early_memremap() alias for early_ioremap(), which
should be fine given that early_ioremap() parses the memory map for
determining type of mapping anyway.

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 arch/ia64/include/asm/io.h |    1 +
 arch/ia64/kernel/efi.c     |   54 +++++++++-----------------------------------
 2 files changed, 12 insertions(+), 43 deletions(-)

diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h
index 74a7cc3..c439d28 100644
--- a/arch/ia64/include/asm/io.h
+++ b/arch/ia64/include/asm/io.h
@@ -424,6 +424,7 @@ extern void __iomem * ioremap(unsigned long offset, unsigned long size);
 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
 extern void iounmap (volatile void __iomem *addr);
 extern void __iomem * early_ioremap (unsigned long phys_addr, unsigned long size);
+#define early_memremap(phys_addr, size)	early_ioremap(phys_addr, size)
 extern void early_iounmap (volatile void __iomem *addr, unsigned long size);
 static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned long size)
 {
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index 51bce59..da5b462 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -44,10 +44,15 @@
 
 #define EFI_DEBUG	0
 
+static __initdata unsigned long palo_phys;
+
+static __initdata efi_config_table_type_t arch_tables[] = {
+	{PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
+	{NULL_GUID, NULL, 0},
+};
+
 extern efi_status_t efi_call_phys (void *, ...);
 
-struct efi efi;
-EXPORT_SYMBOL(efi);
 static efi_runtime_services_t *runtime;
 static u64 mem_limit = ~0UL, max_addr = ~0UL, min_addr = 0UL;
 
@@ -423,9 +428,9 @@ static u8 __init palo_checksum(u8 *buffer, u32 length)
  * Parse and handle PALO table which is published at:
  * http://www.dig64.org/home/DIG64_PALO_R1_0.pdf
  */
-static void __init handle_palo(unsigned long palo_phys)
+static void __init handle_palo(unsigned long phys_addr)
 {
-	struct palo_table *palo = __va(palo_phys);
+	struct palo_table *palo = __va(phys_addr);
 	u8  checksum;
 
 	if (strncmp(palo->signature, PALO_SIG, sizeof(PALO_SIG) - 1)) {
@@ -467,12 +472,10 @@ void __init
 efi_init (void)
 {
 	void *efi_map_start, *efi_map_end;
-	efi_config_table_t *config_tables;
 	efi_char16_t *c16;
 	u64 efi_desc_size;
 	char *cp, vendor[100] = "unknown";
 	int i;
-	unsigned long palo_phys;
 
 	/*
 	 * It's too early to be able to use the standard kernel command line
@@ -514,8 +517,6 @@ efi_init (void)
 		       efi.systab->hdr.revision >> 16,
 		       efi.systab->hdr.revision & 0xffff);
 
-	config_tables = __va(efi.systab->tables);
-
 	/* Show what we know for posterity */
 	c16 = __va(efi.systab->fw_vendor);
 	if (c16) {
@@ -528,43 +529,10 @@ efi_init (void)
 	       efi.systab->hdr.revision >> 16,
 	       efi.systab->hdr.revision & 0xffff, vendor);
 
-	efi.mps        = EFI_INVALID_TABLE_ADDR;
-	efi.acpi       = EFI_INVALID_TABLE_ADDR;
-	efi.acpi20     = EFI_INVALID_TABLE_ADDR;
-	efi.smbios     = EFI_INVALID_TABLE_ADDR;
-	efi.sal_systab = EFI_INVALID_TABLE_ADDR;
-	efi.boot_info  = EFI_INVALID_TABLE_ADDR;
-	efi.hcdp       = EFI_INVALID_TABLE_ADDR;
-	efi.uga        = EFI_INVALID_TABLE_ADDR;
-
 	palo_phys      = EFI_INVALID_TABLE_ADDR;
 
-	for (i = 0; i < (int) efi.systab->nr_tables; i++) {
-		if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) = 0) {
-			efi.mps = config_tables[i].table;
-			printk(" MPS=0x%lx", config_tables[i].table);
-		} else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) = 0) {
-			efi.acpi20 = config_tables[i].table;
-			printk(" ACPI 2.0=0x%lx", config_tables[i].table);
-		} else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) = 0) {
-			efi.acpi = config_tables[i].table;
-			printk(" ACPI=0x%lx", config_tables[i].table);
-		} else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) = 0) {
-			efi.smbios = config_tables[i].table;
-			printk(" SMBIOS=0x%lx", config_tables[i].table);
-		} else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) = 0) {
-			efi.sal_systab = config_tables[i].table;
-			printk(" SALsystab=0x%lx", config_tables[i].table);
-		} else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) = 0) {
-			efi.hcdp = config_tables[i].table;
-			printk(" HCDP=0x%lx", config_tables[i].table);
-		} else if (efi_guidcmp(config_tables[i].guid,
-			 PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID) = 0) {
-			palo_phys = config_tables[i].table;
-			printk(" PALO=0x%lx", config_tables[i].table);
-		}
-	}
-	printk("\n");
+	if (efi_config_init(arch_tables) != 0)
+		return;
 
 	if (palo_phys != EFI_INVALID_TABLE_ADDR)
 		handle_palo(palo_phys);
-- 
1.7.10.4

[PATCH 4/4] efi: x86: make efi_lookup_mapped_addr() a common function

[Leif Lindholm]

efi_lookup_mapped_addr() is a handy utility for other platforms
than x86. Move it from arch/x86 to drivers/firmware/efi.

This function will be used by future ARM patches.

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
 arch/x86/platform/efi/efi.c |   28 ----------------------------
 drivers/firmware/efi/efi.c  |   30 ++++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index ed2be58..3af9d36 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -736,34 +736,6 @@ static void __init runtime_code_page_mkexec(void)
 	}
 }
 
-/*
- * We can't ioremap data in EFI boot services RAM, because we've already mapped
- * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
- * callable after efi_enter_virtual_mode and before efi_free_boot_services.
- */
-void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
-{
-	void *p;
-	if (WARN_ON(!memmap.map))
-		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 end = md->phys_addr + size;
-		if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
-		    md->type != EFI_BOOT_SERVICES_CODE &&
-		    md->type != EFI_BOOT_SERVICES_DATA)
-			continue;
-		if (!md->virt_addr)
-			continue;
-		if (phys_addr >= md->phys_addr && phys_addr < end) {
-			phys_addr += md->virt_addr - md->phys_addr;
-			return (__force void __iomem *)(unsigned long)phys_addr;
-		}
-	}
-	return NULL;
-}
-
 void efi_memory_uc(u64 addr, unsigned long size)
 {
 	unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 4fa944a..94f57c0 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -148,6 +148,36 @@ err_put:
 subsys_initcall(efisubsys_init);
 
 
+#if defined(CONFIG_X86)
+/*
+ * We can't ioremap data in EFI boot services RAM, because we've already mapped
+ * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
+ * callable after efi_enter_virtual_mode and before efi_free_boot_services.
+ */
+void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
+{
+	void *p;
+	if (WARN_ON(!memmap.map))
+		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 end = md->phys_addr + size;
+		if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
+		    md->type != EFI_BOOT_SERVICES_CODE &&
+		    md->type != EFI_BOOT_SERVICES_DATA)
+			continue;
+		if (!md->virt_addr)
+			continue;
+		if (phys_addr >= md->phys_addr && phys_addr < end) {
+			phys_addr += md->virt_addr - md->phys_addr;
+			return (__force void __iomem *)(unsigned long)phys_addr;
+		}
+	}
+	return NULL;
+}
+#endif
+
 static __initdata efi_config_table_type_t common_tables[] = {
 	{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
 	{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
-- 
1.7.10.4

Re: [PATCH 4/4] efi: x86: make efi_lookup_mapped_addr() a common function

[Matt Fleming]

On 07/30/2013 05:47 PM, Leif Lindholm wrote:
> efi_lookup_mapped_addr() is a handy utility for other platforms
> than x86. Move it from arch/x86 to drivers/firmware/efi.
> 
> This function will be used by future ARM patches.
> 
> Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
> ---
>  arch/x86/platform/efi/efi.c |   28 ----------------------------
>  drivers/firmware/efi/efi.c  |   30 ++++++++++++++++++++++++++++++
>  2 files changed, 30 insertions(+), 28 deletions(-)
> 

[...]

> +#if defined(CONFIG_X86)
> +/*
> + * We can't ioremap data in EFI boot services RAM, because we've already mapped
> + * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
> + * callable after efi_enter_virtual_mode and before efi_free_boot_services.
> + */
> +void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
> +{
> +	void *p;
> +	if (WARN_ON(!memmap.map))
> +		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 end = md->phys_addr + size;
> +		if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
> +		    md->type != EFI_BOOT_SERVICES_CODE &&
> +		    md->type != EFI_BOOT_SERVICES_DATA)
> +			continue;
> +		if (!md->virt_addr)
> +			continue;
> +		if (phys_addr >= md->phys_addr && phys_addr < end) {
> +			phys_addr += md->virt_addr - md->phys_addr;
> +			return (__force void __iomem *)(unsigned long)phys_addr;
> +		}
> +	}
> +	return NULL;
> +}
> +#endif
> +

If we hang a 'struct efi_memory_map' off of 'struct efi', can we get rid
of this #ifdef?

Re: [PATCH 4/4] efi: x86: make efi_lookup_mapped_addr() a common function

[Leif Lindholm]

On Wed, Jul 31, 2013 at 09:58:20AM +0100, Matt Fleming wrote:
> On 07/30/2013 05:47 PM, Leif Lindholm wrote:
> > efi_lookup_mapped_addr() is a handy utility for other platforms
> > than x86. Move it from arch/x86 to drivers/firmware/efi.
> > 
> > This function will be used by future ARM patches.
> > 
> > Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
> > ---
> >  arch/x86/platform/efi/efi.c |   28 ----------------------------
> >  drivers/firmware/efi/efi.c  |   30 ++++++++++++++++++++++++++++++
> >  2 files changed, 30 insertions(+), 28 deletions(-)
> > 
> 
> [...]
> 
> > +#if defined(CONFIG_X86)
> > +/*
> > + * We can't ioremap data in EFI boot services RAM, because we've already mapped
> > + * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
> > + * callable after efi_enter_virtual_mode and before efi_free_boot_services.
> > + */
> > +void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
> > +{
> > +	void *p;
> > +	if (WARN_ON(!memmap.map))
> > +		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 end = md->phys_addr + size;
> > +		if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
> > +		    md->type != EFI_BOOT_SERVICES_CODE &&
> > +		    md->type != EFI_BOOT_SERVICES_DATA)
> > +			continue;
> > +		if (!md->virt_addr)
> > +			continue;
> > +		if (phys_addr >= md->phys_addr && phys_addr < end) {
> > +			phys_addr += md->virt_addr - md->phys_addr;
> > +			return (__force void __iomem *)(unsigned long)phys_addr;
> > +		}
> > +	}
> > +	return NULL;
> > +}
> > +#endif
> > +
> 
> If we hang a 'struct efi_memory_map' off of 'struct efi', can we get rid
> of this #ifdef?

Sure.

It would just be a small bit of wasted memory for IA64 (struct +
code). On the flip side, having that on all platforms could lend
itself to making a little bit more code common.

Tony?

/
    Leif

Re: [PATCH 0/4] Make commonly useful UEFI functions common

[Tony Luck]

On Tue, Jul 30, 2013 at 9:47 AM, Leif Lindholm <leif.lindholm@linaro.org> wrote:
> IA64 code compile tested only.

Compiled on a bunch of ia64 configurations, Boot tested. But not on machine that
does the PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID thingy.
Code to do the arch specific thing looks ok though.

-Tony

Re: [PATCH 0/4] Make commonly useful UEFI functions common

[H. Peter Anvin]

On 07/30/2013 09:47 AM, Leif Lindholm wrote:
> This set breaks out some common code from x86/ia64 EFI support
> code and puts it into drivers/firmware/efi.
> 
> First it takes the definition of the global "efi" data structure
> and moves it into global efi.c. Then it implements a common version
> of efi_config_init().
> 
> Secondly it breaks the efi_lookup_mapped_addr() function out of x86
> and places it in global efi.c, for shared use with future ARM
> patches.
> 
> IA64 code compile tested only.
> 
> Pardon the delay in getting this out - back to back conferences
> followed by a bad case of the man flu.
> 
> Leif Lindholm (4):
>   efi: provide a generic efi_config_init()
>   efi: x86: use common code for (U)EFI configuration scanning
>   efi: ia64: use common code for (U)EFI configuration scanning
>   efi: x86: make efi_lookup_mapped_addr() a common function
> 
>  arch/ia64/include/asm/io.h  |    1 +
>  arch/ia64/kernel/efi.c      |   54 ++++-------------
>  arch/x86/platform/efi/efi.c |  124 +++------------------------------------
>  drivers/firmware/efi/efi.c  |  136 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/efi.h         |    7 +++
>  5 files changed, 163 insertions(+), 159 deletions(-)
> 

Matt, I assume you're picking this up once the missing bits are plugged
in, right?

	-hpa

Re: [PATCH 0/4] Make commonly useful UEFI functions common

[Fleming, Matt]

On 1 August 2013 21:26, H. Peter Anvin <hpa@zytor.com> wrote:
> Matt, I assume you're picking this up once the missing bits are plugged
> in, right?

Yep, that was my plan.