Re: [ACPI] [PATCH] ACPI: implement UUID-labelled vendor-defined resources

[Bjorn Helgaas <bjorn.helgaas@hp.com>]

On Friday 18 March 2005 1:19 pm, Bjorn Helgaas wrote:
> ACPI 3.0 includes UUID-labelled vendor-defined resources (section 6.4.3.2),
> so move the code that supports this from arch/ia64 into ACPI proper.

There were some questions about the copyright status of this patch,
and whether it could be licensed appropriately for ACPI.  But I thought
those were all resolved.

I'm only trying to be a good citizen and contribute support for new
stuff in ACPI 3.0.  But if people want this to stay in ia64, I guess
that's OK with me, too.

BTW, is there still an ACPI BK tree?  The ones mentioned here:
    http://ftp.kernel.org/pub/linux/kernel/people/lenb/acpi/patches/README.ACPI
seem to be gone.

> When the code was under arch/ia64, we used EFI GUID stuff, but this time I
> defined acpi_uuid equivalents to avoid the need to depend on EFI.
> 
> Len, Tony, this touches both acpi and ia64.  Let me know if this is
> a problem.
> 
> This patch may be used under either the GPL or the BSD license.
> 
> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
> 
> === arch/ia64/kernel/acpi-ext.c 1.5 vs edited ==> --- 1.5/arch/ia64/kernel/acpi-ext.c	2004-10-05 12:19:50 -06:00
> +++ edited/arch/ia64/kernel/acpi-ext.c	2005-03-18 11:29:18 -07:00
> @@ -12,89 +12,35 @@
>  #include <linux/module.h>
>  #include <linux/types.h>
>  #include <linux/acpi.h>
> -#include <linux/efi.h>
>  
>  #include <asm/acpi-ext.h>
>  
> -struct acpi_vendor_descriptor {
> -	u8				guid_id;
> -	efi_guid_t			guid;
> -};
> -
> -struct acpi_vendor_info {
> -	struct acpi_vendor_descriptor	*descriptor;
> -	u8				*data;
> -	u32				length;
> -};
> -
> -acpi_status
> -acpi_vendor_resource_match(struct acpi_resource *resource, void *context)
> -{
> -	struct acpi_vendor_info *info = (struct acpi_vendor_info *) context;
> -	struct acpi_resource_vendor *vendor;
> -	struct acpi_vendor_descriptor *descriptor;
> -	u32 length;
> -
> -	if (resource->id != ACPI_RSTYPE_VENDOR)
> -		return AE_OK;
> -
> -	vendor = (struct acpi_resource_vendor *) &resource->data;
> -	descriptor = (struct acpi_vendor_descriptor *) vendor->reserved;
> -	if (vendor->length <= sizeof(*info->descriptor) ||
> -	    descriptor->guid_id != info->descriptor->guid_id ||
> -	    efi_guidcmp(descriptor->guid, info->descriptor->guid))
> -		return AE_OK;
> -
> -	length = vendor->length - sizeof(struct acpi_vendor_descriptor);
> -	info->data = acpi_os_allocate(length);
> -	if (!info->data)
> -		return AE_NO_MEMORY;
> -
> -	memcpy(info->data, vendor->reserved + sizeof(struct acpi_vendor_descriptor), length);
> -	info->length = length;
> -	return AE_CTRL_TERMINATE;
> -}
> -
> -acpi_status
> -acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor *id,
> -		u8 **data, u32 *length)
> -{
> -	struct acpi_vendor_info info;
> -
> -	info.descriptor = id;
> -	info.data = NULL;
> -
> -	acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match, &info);
> -	if (!info.data)
> -		return AE_NOT_FOUND;
> -
> -	*data = info.data;
> -	*length = info.length;
> -	return AE_OK;
> -}
> -
>  struct acpi_vendor_descriptor hp_ccsr_descriptor = {
> -	.guid_id = 2,
> -	.guid    = EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad)
> +	.uuid_subtype = 2,
> +	.uuid    = ACPI_UUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad)
>  };
>  
>  acpi_status
>  hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
>  {
> -	acpi_status status;
> -	u8 *data;
> +	acpi_status status = AE_OK;
> +	u8 *data = NULL;
>  	u32 length;
>  
> -	status = acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data, &length);
> +	status = acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data,
> +		&length);
>  
> -	if (ACPI_FAILURE(status) || length != 16)
> -		return AE_NOT_FOUND;
> +	if (ACPI_FAILURE(status) || length != 16) {
> +		status = AE_NOT_FOUND;
> +		goto out;
> +	}
>  
>  	memcpy(csr_base, data, sizeof(*csr_base));
>  	memcpy(csr_length, data + 8, sizeof(*csr_length));
> -	acpi_os_free(data);
>  
> -	return AE_OK;
> +out:
> +	acpi_os_free(data);
> +	return status;
>  }
>  
>  EXPORT_SYMBOL(hp_acpi_csr_space);
> === drivers/acpi/resources/rsxface.c 1.22 vs edited ==> --- 1.22/drivers/acpi/resources/rsxface.c	2005-01-20 22:17:54 -07:00
> +++ edited/drivers/acpi/resources/rsxface.c	2005-03-18 12:24:34 -07:00
> @@ -435,3 +435,90 @@
>  }
>  EXPORT_SYMBOL(acpi_resource_to_address64);
>  
> +static inline int
> +acpi_uuidcmp (struct acpi_uuid left, struct acpi_uuid right)
> +{
> +	return memcmp(&left, &right, sizeof(left));
> +}
> +
> +static acpi_status
> +acpi_vendor_resource_match(struct acpi_resource *resource, void *context)
> +{
> +	struct acpi_vendor_info *info = (struct acpi_vendor_info *) context;
> +	struct acpi_resource_vendor *vendor;
> +	struct acpi_vendor_descriptor *descriptor;
> +	u32 length;
> +
> +	if (resource->id != ACPI_RSTYPE_VENDOR)
> +		return AE_OK;
> +
> +	vendor = (struct acpi_resource_vendor *) &resource->data;
> +	descriptor = (struct acpi_vendor_descriptor *) vendor->reserved;
> +	if (vendor->length <= sizeof(*info->descriptor) ||
> +	    descriptor->uuid_subtype != info->descriptor->uuid_subtype ||
> +	    acpi_uuidcmp(descriptor->uuid, info->descriptor->uuid))
> +		return AE_OK;
> +
> +	length = vendor->length - sizeof(struct acpi_vendor_descriptor);
> +	info->data = acpi_os_allocate(length);
> +	if (!info->data)
> +		return AE_NO_MEMORY;
> +
> +	memcpy(info->data, vendor->reserved + sizeof(struct acpi_vendor_descriptor), length);
> +	info->length = length;
> +	return AE_CTRL_TERMINATE;
> +}
> +
> +/*******************************************************************************
> + *
> + * FUNCTION:    acpi_find_vendor_resource
> + *
> + * PARAMETERS:  device_handle   - a handle to the device object for the
> + *                                device we are querying
> + *              id              - a pointer to the acpi_vendor_descriptor
> + *                                for the UUID-identified vendor-defined
> + *                                resource we want
> + *              data            - a pointer to a pointer where the address
> + *                                of the vendor data will be stored
> + *              length          - a pointer to an integer where the length
> + *                                of the vendor data will be stored
> + *
> + * RETURN:      Status
> + *
> + * DESCRIPTION: This function walks the current resources for the specified
> + *              device and looks for a vendor-defined resource that matches
> + *              the supplied UUID and subtype.
> + *
> + *              If the desired resource is found, a buffer is allocated for
> + *              the vendor-defined data (excluding the UUID and other headers),
> + *              and the address and size of the buffer are returned in *data
> + *              and *length.  The caller is responsible for deallocating
> + *              the buffer with acpi_os_free().
> + *
> + *              If the function fails, AE_NOT_FOUND will be returned and
> + *              the values of *data and *length are unchanged.
> + *
> + ******************************************************************************/
> +
> +acpi_status
> +acpi_find_vendor_resource(
> +	acpi_handle			device_handle,
> +	struct acpi_vendor_descriptor	*id,
> +	u8				**data,
> +	u32				*length)
> +{
> +	struct acpi_vendor_info info;
> +
> +	info.descriptor = id;
> +	info.data = NULL;
> +
> +	acpi_walk_resources(device_handle, METHOD_NAME__CRS,
> +		acpi_vendor_resource_match, &info);
> +	if (!info.data)
> +		return AE_NOT_FOUND;
> +
> +	*data = info.data;
> +	*length = info.length;
> +	return AE_OK;
> +}
> +EXPORT_SYMBOL(acpi_find_vendor_resource);
> === include/acpi/acpixf.h 1.31 vs edited ==> --- 1.31/include/acpi/acpixf.h	2005-01-20 22:17:55 -07:00
> +++ edited/include/acpi/acpixf.h	2005-03-18 12:09:12 -07:00
> @@ -425,10 +425,10 @@
>  
>  acpi_status
>  acpi_walk_resources (
> -	acpi_handle                             device_handle,
> -	char                                    *path,
> +	acpi_handle                     device_handle,
> +	char                            *path,
>  	ACPI_WALK_RESOURCE_CALLBACK     user_function,
> -	void                                    *context);
> +	void                            *context);
>  
>  acpi_status
>  acpi_set_current_resources (
> @@ -443,7 +443,14 @@
>  acpi_status
>  acpi_resource_to_address64 (
>  	struct acpi_resource            *resource,
> -	struct acpi_resource_address64 *out);
> +	struct acpi_resource_address64  *out);
> +
> +acpi_status
> +acpi_find_vendor_resource (
> +	acpi_handle                     device_handle,
> +	struct acpi_vendor_descriptor   *id,
> +	u8                              **data,
> +	u32                             *length);
>  
>  /*
>   * Hardware (ACPI device) interfaces
> === include/acpi/actypes.h 1.41 vs edited ==> --- 1.41/include/acpi/actypes.h	2005-01-20 22:17:55 -07:00
> +++ edited/include/acpi/actypes.h	2005-03-18 11:23:21 -07:00
> @@ -1045,6 +1045,16 @@
>  #define ACPI_PRODUCER                   (u8) 0x00
>  #define ACPI_CONSUMER                   (u8) 0x01
>  
> +struct acpi_uuid {
> +	u8                              b[16];
> +};
> +
> +#define ACPI_UUID(a,b,c,d0,d1,d2,d3,d4,d5,d6,d7) \
> +((struct acpi_uuid) \
> +{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
> +  (b) & 0xff, ((b) >> 8) & 0xff, \
> +  (c) & 0xff, ((c) >> 8) & 0xff, \
> +  (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
>  
>  /*
>   *  Structures used to describe device resources
> @@ -1097,6 +1107,18 @@
>  {
>  	u32                                 length;
>  	u8                                  reserved[1];
> +};
> +
> +struct acpi_vendor_descriptor
> +{
> +	u8                                  uuid_subtype;
> +	struct acpi_uuid                    uuid;
> +};
> +
> +struct acpi_vendor_info {
> +	struct acpi_vendor_descriptor       *descriptor;
> +	u8                                  *data;
> +	u32                                 length;
>  };
>  
>  struct acpi_resource_end_tag
> 
> 
> 
> 
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