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cxl/mbox: Move build of user mailbox cmd to a helper functions 

In preparation for moving the construction of a mailbox command
to the validation path, extract the work into a helper functions.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/493d7618a846d787c3ae28778935ca35e2b85eed.1648687552.git.alison.schofield@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Alison Schofield 2022-03-30 18:27:13 -07:00 committed by Dan Williams
parent 39ed8da4f3
commit 63cf60b7e0
1 changed files with 45 additions and 25 deletions
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70
drivers/cxl/core/mbox.c
View File

@ -207,6 +207,44 @@ static bool cxl_mem_raw_command_allowed(u16 opcode)
return true;
}
static int cxl_mbox_cmd_ctor(struct cxl_mbox_cmd *mbox,
struct cxl_dev_state *cxlds, u16 opcode,
size_t in_size, size_t out_size, u64 in_payload)
{
*mbox = (struct cxl_mbox_cmd) {
.opcode = opcode,
.size_in = in_size,
};
if (in_size) {
mbox->payload_in = vmemdup_user(u64_to_user_ptr(in_payload),
in_size);
if (!mbox->payload_in)
return PTR_ERR(mbox->payload_in);
}
/* Prepare to handle a full payload for variable sized output */
if (out_size < 0)
mbox->size_out = cxlds->payload_size;
else
mbox->size_out = out_size;
if (mbox->size_out) {
mbox->payload_out = kvzalloc(mbox->size_out, GFP_KERNEL);
if (!mbox->payload_out) {
kvfree(mbox->payload_in);
return -ENOMEM;
}
}
return 0;
}
static void cxl_mbox_cmd_dtor(struct cxl_mbox_cmd *mbox)
{
kvfree(mbox->payload_in);
kvfree(mbox->payload_out);
}
static int cxl_to_mem_cmd_raw(struct cxl_mem_command *mem_cmd,
const struct cxl_send_command *send_cmd,
struct cxl_dev_state *cxlds)
@ -390,27 +428,14 @@ static int handle_mailbox_cmd_from_user(struct cxl_dev_state *cxlds,
s32 *size_out, u32 *retval)
{
struct device *dev = cxlds->dev;
struct cxl_mbox_cmd mbox_cmd = {
.opcode = cmd->opcode,
.size_in = cmd->info.size_in,
.size_out = cmd->info.size_out,
};
struct cxl_mbox_cmd mbox_cmd;
int rc;
if (cmd->info.size_out) {
mbox_cmd.payload_out = kvzalloc(cmd->info.size_out, GFP_KERNEL);
if (!mbox_cmd.payload_out)
return -ENOMEM;
}
if (cmd->info.size_in) {
mbox_cmd.payload_in = vmemdup_user(u64_to_user_ptr(in_payload),
cmd->info.size_in);
if (IS_ERR(mbox_cmd.payload_in)) {
kvfree(mbox_cmd.payload_out);
return PTR_ERR(mbox_cmd.payload_in);
}
}
rc = cxl_mbox_cmd_ctor(&mbox_cmd, cxlds, cmd->opcode,
cmd->info.size_in, cmd->info.size_out,
in_payload);
if (rc)
return rc;
dev_dbg(dev,
"Submitting %s command for user\n"
@ -442,8 +467,7 @@ static int handle_mailbox_cmd_from_user(struct cxl_dev_state *cxlds,
*retval = mbox_cmd.return_code;
out:
kvfree(mbox_cmd.payload_in);
kvfree(mbox_cmd.payload_out);
cxl_mbox_cmd_dtor(&mbox_cmd);
return rc;
}
@ -464,10 +488,6 @@ int cxl_send_cmd(struct cxl_memdev *cxlmd, struct cxl_send_command __user *s)
if (rc)
return rc;
/* Prepare to handle a full payload for variable sized output */
if (c.info.size_out < 0)
c.info.size_out = cxlds->payload_size;
rc = handle_mailbox_cmd_from_user(cxlds, &c, send.in.payload,
send.out.payload, &send.out.size,
&send.retval);