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block/sed-opal: allocate struct opal_dev dynamically

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Insted of bloating the containing structure with it all the time this
allocates struct opal_dev dynamically.  Additionally this allows moving
the definition of struct opal_dev into sed-opal.c.  For this a new
private data field is added to it that is passed to the send/receive
callback.  After that a lot of internals can be made private as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Scott Bauer <scott.bauer@intel.com>
Reviewed-by: Scott Bauer <scott.bauer@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2017-02-17 13:59:39 +01:00 • committed by Jens Axboe
parent f5b37b7c23
commit 4f1244c829
6 changed files with 131 additions and 140 deletions
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116
include/linux/sed-opal.h
View file

@ -21,117 +21,14 @@
#include <uapi/linux/sed-opal.h>
#include <linux/kernel.h>
/*
* These constant values come from:
* SPC-4 section
* 6.30 SECURITY PROTOCOL IN command / table 265.
*/
enum {
TCG_SECP_00 = 0,
TCG_SECP_01,
};
struct opal_dev;
#define IO_BUFFER_LENGTH 2048
#define MAX_TOKS 64
typedef int (*opal_step)(struct opal_dev *dev);
typedef int (sec_send_recv)(struct opal_dev *ctx, u16 spsp, u8 secp,
void *buffer, size_t len, bool send);
enum opal_atom_width {
OPAL_WIDTH_TINY,
OPAL_WIDTH_SHORT,
OPAL_WIDTH_MEDIUM,
OPAL_WIDTH_LONG,
OPAL_WIDTH_TOKEN
};
/*
* Token defs derived from:
* TCG_Storage_Architecture_Core_Spec_v2.01_r1.00
* 3.2.2 Data Stream Encoding
*/
enum opal_response_token {
OPAL_DTA_TOKENID_BYTESTRING = 0xe0,
OPAL_DTA_TOKENID_SINT = 0xe1,
OPAL_DTA_TOKENID_UINT = 0xe2,
OPAL_DTA_TOKENID_TOKEN = 0xe3, /* actual token is returned */
OPAL_DTA_TOKENID_INVALID = 0X0
};
/*
* On the parsed response, we don't store again the toks that are already
* stored in the response buffer. Instead, for each token, we just store a
* pointer to the position in the buffer where the token starts, and the size
* of the token in bytes.
*/
struct opal_resp_tok {
const u8 *pos;
size_t len;
enum opal_response_token type;
enum opal_atom_width width;
union {
u64 u;
s64 s;
} stored;
};
/*
* From the response header it's not possible to know how many tokens there are
* on the payload. So we hardcode that the maximum will be MAX_TOKS, and later
* if we start dealing with messages that have more than that, we can increase
* this number. This is done to avoid having to make two passes through the
* response, the first one counting how many tokens we have and the second one
* actually storing the positions.
*/
struct parsed_resp {
int num;
struct opal_resp_tok toks[MAX_TOKS];
};
/**
* struct opal_dev - The structure representing a OPAL enabled SED.
* @supported: Whether or not OPAL is supported on this controller.
* @send_recv: The combined sec_send/sec_recv function pointer.
* @opal_step: A series of opal methods that are necessary to complete a command.
* @func_data: An array of parameters for the opal methods above.
* @state: Describes the current opal_step we're working on.
* @dev_lock: Locks the entire opal_dev structure.
* @parsed: Parsed response from controller.
* @prev_data: Data returned from a method to the controller.
* @unlk_lst: A list of Locking ranges to unlock on this device during a resume.
*/
struct opal_dev {
bool initialized;
bool supported;
sec_send_recv *send_recv;
const opal_step *funcs;
void **func_data;
int state;
struct mutex dev_lock;
u16 comid;
u32 hsn;
u32 tsn;
u64 align;
u64 lowest_lba;
size_t pos;
u8 cmd[IO_BUFFER_LENGTH];
u8 resp[IO_BUFFER_LENGTH];
struct parsed_resp parsed;
size_t prev_d_len;
void *prev_data;
struct list_head unlk_lst;
};
typedef int (sec_send_recv)(void *data, u16 spsp, u8 secp, void *buffer,
size_t len, bool send);
#ifdef CONFIG_BLK_SED_OPAL
bool opal_unlock_from_suspend(struct opal_dev *dev);
void init_opal_dev(struct opal_dev *opal_dev, sec_send_recv *send_recv);
struct opal_dev *init_opal_dev(void *data, sec_send_recv *send_recv);
int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *ioctl_ptr);
static inline bool is_sed_ioctl(unsigned int cmd)
@ -168,11 +65,6 @@ static inline bool opal_unlock_from_suspend(struct opal_dev *dev)
{
return false;
}
static inline void init_opal_dev(struct opal_dev *opal_dev,
sec_send_recv *send_recv)
{
opal_dev->supported = false;
opal_dev->initialized = true;
}
#define init_opal_dev(data, send_recv) NULL
#endif /* CONFIG_BLK_SED_OPAL */
#endif /* LINUX_OPAL_H */