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efi_enabled(EFI_PARAVIRT) use

Message ID 20160502104530.GV2839@codeblueprint.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Matt Fleming May 2, 2016, 10:45 a.m. UTC 
On Sun, 01 May, at 10:36:51PM, Shannon Zhao wrote:
> So is there any other way you suggest?

Would this work (compile tested but not runtime tested)?

---

Comments

Shannon Zhao May 3, 2016, 1:45 a.m. UTC | #1 
On 2016/5/2 18:45, Matt Fleming wrote:
> On Sun, 01 May, at 10:36:51PM, Shannon Zhao wrote:
>> So is there any other way you suggest?
> 
> Would this work (compile tested but not runtime tested)?
> 
> ---
> 
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 3a69ed5ecfcb..13d8be16447a 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -469,12 +469,14 @@ device_initcall(efi_load_efivars);
>  		FIELD_SIZEOF(struct efi_fdt_params, field) \
>  	}
>  
> -static __initdata struct {
> +struct params {
>  	const char name[32];
>  	const char propname[32];
>  	int offset;
>  	int size;
> -} dt_params[] = {
> +};
> +
> +static __initdata struct params fdt_params[] = {
>  	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
>  	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
>  	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
> @@ -482,44 +484,83 @@ static __initdata struct {
>  	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
>  };
>  
> +static __initdata struct params xen_fdt_params[] = {
> +	UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
> +	UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
> +	UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
> +	UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
> +	UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
> +};
> +
> +#define EFI_FDT_PARAMS_SIZE	ARRAY_SIZE(fdt_params)
> +
> +static __initdata struct {
> +	const char *uname;
> +	struct params *params;
> +} dt_params[] = {
> +	{ "hypervisor", xen_fdt_params },
While the uefi params are located under /hypervisor/uefi node not
/hypervisor node.

> +	{ "chosen", fdt_params },
> +};
> +
>  struct param_info {
>  	int found;
>  	void *params;
> +	const char *missing;
>  };
>  
> -static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
> -				       int depth, void *data)
> +static int __init __find_uefi_params(unsigned long node,
> +				     struct param_info *info,
> +				     struct params *params)
>  {
> -	struct param_info *info = data;
>  	const void *prop;
>  	void *dest;
>  	u64 val;
>  	int i, len;
>  
> -	if (depth != 1 || strcmp(uname, "chosen") != 0)
> -		return 0;
> -
> -	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
> -		prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
> -		if (!prop)
> +	for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
> +		prop = of_get_flat_dt_prop(node, params[i].propname, &len);
> +		if (!prop) {
> +			info->missing = params[i].name;
>  			return 0;
> -		dest = info->params + dt_params[i].offset;
> +		}
> +
> +		dest = info->params + params[i].offset;
>  		info->found++;
>  
>  		val = of_read_number(prop, len / sizeof(u32));
>  
> -		if (dt_params[i].size == sizeof(u32))
> +		if (params[i].size == sizeof(u32))
>  			*(u32 *)dest = val;
>  		else
>  			*(u64 *)dest = val;
>  
>  		if (efi_enabled(EFI_DBG))
> -			pr_info("  %s: 0x%0*llx\n", dt_params[i].name,
> -				dt_params[i].size * 2, val);
> +			pr_info("  %s: 0x%0*llx\n", params[i].name,
> +				params[i].size * 2, val);
>  	}
> +
>  	return 1;
>  }
>  
> +static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
> +				       int depth, void *data)
> +{
> +	struct param_info *info = data;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
> +
> +		if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
> +			info->missing = dt_params[i].params[0].name;
> +			continue;
> +		}
> +
So here it needs to check whether the node is /hypervisor. If so, get
the subnode "uefi". Like below:
if (strcmp(uname, "hypervisor") == 0) {
	offset = of_get_flat_dt_subnode_by_name(node, "uefi");
	if (offset < 0)
		return 0;
	node = offset;
}

> +		return __find_uefi_params(node, info, dt_params[i].params);
> +	}
> +
> +	return 0;
> +}
> +
>  int __init efi_get_fdt_params(struct efi_fdt_params *params)
>  {
>  	struct param_info info;
> @@ -535,7 +576,7 @@ int __init efi_get_fdt_params(struct efi_fdt_params *params)
>  		pr_info("UEFI not found.\n");
>  	else if (!ret)
>  		pr_err("Can't find '%s' in device tree!\n",
> -		       dt_params[info.found].name);
> +		       info.missing);
>  
>  	return ret;
>  }
>
Matt Fleming May 4, 2016, 11:36 a.m. UTC | #2 
On Tue, 03 May, at 09:45:22AM, Shannon Zhao wrote:
> > +static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
> > +				       int depth, void *data)
> > +{
> > +	struct param_info *info = data;
> > +	int i;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
> > +
> > +		if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
> > +			info->missing = dt_params[i].params[0].name;
> > +			continue;
> > +		}
> > +
> So here it needs to check whether the node is /hypervisor. If so, get
> the subnode "uefi". Like below:
> if (strcmp(uname, "hypervisor") == 0) {
> 	offset = of_get_flat_dt_subnode_by_name(node, "uefi");
> 	if (offset < 0)
> 		return 0;
> 	node = offset;
> }

Urgh, right.

How about giving dt_params a const char *subnode field and doing,

	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
		const char *subnode = dt_params[i].sub_node;

		if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
			info->missing = dt_params[i].params[0].name;
			continue;
		}

		if (subnode) {
			offset = of_get_flat_dt_subnode_by_name(node, subnode);
			if (offset < 0)
				return 0;
			node = offset;
		}

	...
diff mbox

Patch

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 3a69ed5ecfcb..13d8be16447a 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -469,12 +469,14 @@  device_initcall(efi_load_efivars);
 		FIELD_SIZEOF(struct efi_fdt_params, field) \
 	}
 
-static __initdata struct {
+struct params {
 	const char name[32];
 	const char propname[32];
 	int offset;
 	int size;
-} dt_params[] = {
+};
+
+static __initdata struct params fdt_params[] = {
 	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
 	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
 	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
@@ -482,44 +484,83 @@  static __initdata struct {
 	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
 };
 
+static __initdata struct params xen_fdt_params[] = {
+	UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
+	UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
+	UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
+	UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
+	UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
+};
+
+#define EFI_FDT_PARAMS_SIZE	ARRAY_SIZE(fdt_params)
+
+static __initdata struct {
+	const char *uname;
+	struct params *params;
+} dt_params[] = {
+	{ "hypervisor", xen_fdt_params },
+	{ "chosen", fdt_params },
+};
+
 struct param_info {
 	int found;
 	void *params;
+	const char *missing;
 };
 
-static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
-				       int depth, void *data)
+static int __init __find_uefi_params(unsigned long node,
+				     struct param_info *info,
+				     struct params *params)
 {
-	struct param_info *info = data;
 	const void *prop;
 	void *dest;
 	u64 val;
 	int i, len;
 
-	if (depth != 1 || strcmp(uname, "chosen") != 0)
-		return 0;
-
-	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
-		prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
-		if (!prop)
+	for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
+		prop = of_get_flat_dt_prop(node, params[i].propname, &len);
+		if (!prop) {
+			info->missing = params[i].name;
 			return 0;
-		dest = info->params + dt_params[i].offset;
+		}
+
+		dest = info->params + params[i].offset;
 		info->found++;
 
 		val = of_read_number(prop, len / sizeof(u32));
 
-		if (dt_params[i].size == sizeof(u32))
+		if (params[i].size == sizeof(u32))
 			*(u32 *)dest = val;
 		else
 			*(u64 *)dest = val;
 
 		if (efi_enabled(EFI_DBG))
-			pr_info("  %s: 0x%0*llx\n", dt_params[i].name,
-				dt_params[i].size * 2, val);
+			pr_info("  %s: 0x%0*llx\n", params[i].name,
+				params[i].size * 2, val);
 	}
+
 	return 1;
 }
 
+static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
+				       int depth, void *data)
+{
+	struct param_info *info = data;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
+
+		if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
+			info->missing = dt_params[i].params[0].name;
+			continue;
+		}
+
+		return __find_uefi_params(node, info, dt_params[i].params);
+	}
+
+	return 0;
+}
+
 int __init efi_get_fdt_params(struct efi_fdt_params *params)
 {
 	struct param_info info;
@@ -535,7 +576,7 @@  int __init efi_get_fdt_params(struct efi_fdt_params *params)
 		pr_info("UEFI not found.\n");
 	else if (!ret)
 		pr_err("Can't find '%s' in device tree!\n",
-		       dt_params[info.found].name);
+		       info.missing);
 
 	return ret;
 }