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authorChristoph Hellwig <hch@lst.de>2017-02-17 13:59:39 +0100
committerJens Axboe <axboe@fb.com>2017-02-17 12:41:47 -0700
commit4f1244c8298606b8fae64b4d78b820ae6b896e3c (patch)
tree81fbf9080d730ca328572847be75fa4e05e4268e /block/sed-opal.c
parentf5b37b7c23915af93081a8711e0a0f0219063756 (diff)
downloadlinux-0-day-4f1244c8298606b8fae64b4d78b820ae6b896e3c.tar.gz
block/sed-opal: allocate struct opal_dev dynamically
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>
Diffstat (limited to 'block/sed-opal.c')
-rw-r--r--block/sed-opal.c101
1 files changed, 91 insertions, 10 deletions
diff --git a/block/sed-opal.c b/block/sed-opal.c
index bcdd5b6..d1c52ba 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -31,6 +31,77 @@
#include "opal_proto.h"
+#define IO_BUFFER_LENGTH 2048
+#define MAX_TOKS 64
+
+typedef int (*opal_step)(struct opal_dev *dev);
+
+enum opal_atom_width {
+ OPAL_WIDTH_TINY,
+ OPAL_WIDTH_SHORT,
+ OPAL_WIDTH_MEDIUM,
+ OPAL_WIDTH_LONG,
+ OPAL_WIDTH_TOKEN
+};
+
+/*
+ * 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 {
+ bool supported;
+
+ void *data;
+ 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;
+};
+
+
static const u8 opaluid[][OPAL_UID_LENGTH] = {
/* users */
[OPAL_SMUID_UID] =
@@ -243,14 +314,14 @@ static u16 get_comid_v200(const void *data)
static int opal_send_cmd(struct opal_dev *dev)
{
- return dev->send_recv(dev, dev->comid, TCG_SECP_01,
+ return dev->send_recv(dev->data, dev->comid, TCG_SECP_01,
dev->cmd, IO_BUFFER_LENGTH,
true);
}
static int opal_recv_cmd(struct opal_dev *dev)
{
- return dev->send_recv(dev, dev->comid, TCG_SECP_01,
+ return dev->send_recv(dev->data, dev->comid, TCG_SECP_01,
dev->resp, IO_BUFFER_LENGTH,
false);
}
@@ -1943,16 +2014,24 @@ static int check_opal_support(struct opal_dev *dev)
return ret;
}
-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)
{
- if (opal_dev->initialized)
- return;
- INIT_LIST_HEAD(&opal_dev->unlk_lst);
- mutex_init(&opal_dev->dev_lock);
- opal_dev->send_recv = send_recv;
- if (check_opal_support(opal_dev) < 0)
+ struct opal_dev *dev;
+
+ dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return NULL;
+
+ INIT_LIST_HEAD(&dev->unlk_lst);
+ mutex_init(&dev->dev_lock);
+ dev->data = data;
+ dev->send_recv = send_recv;
+ if (check_opal_support(dev) != 0) {
pr_debug("Opal is not supported on this device\n");
- opal_dev->initialized = true;
+ kfree(dev);
+ return NULL;
+ }
+ return dev;
}
EXPORT_SYMBOL(init_opal_dev);
@@ -2351,6 +2430,8 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg)
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
+ if (!dev)
+ return -ENOTSUPP;
if (!dev->supported) {
pr_err("Not supported\n");
return -ENOTSUPP;