cxl/mbox: Move mailbox related driver state to its own data structure

'struct cxl_dev_state' makes too many assumptions about the capabilities
of a CXL device. In particular it assumes a CXL device has a mailbox and
all of the infrastructure and state that comes along with that.

In preparation for supporting accelerator / Type-2 devices that may not
have a mailbox and in general maintain a minimal core context structure,
make mailbox functionality a super-set of  'struct cxl_dev_state' with
'struct cxl_memdev_state'.

With this reorganization it allows for CXL devices that support HDM
decoder mapping, but not other general-expander / Type-3 capabilities,
to only enable that subset without the rest of the mailbox
infrastructure coming along for the ride.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/168679260240.3436160.15520641540463704524.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 18 insertions, 17 deletions

diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index 71cfa1fdf902..7cb8994f8809 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -15,9 +15,9 @@ extern const struct nvdimm_security_ops *cxl_security_ops;
 
 static __read_mostly DECLARE_BITMAP(exclusive_cmds, CXL_MEM_COMMAND_ID_MAX);
 
-static void clear_exclusive(void *cxlds)
+static void clear_exclusive(void *mds)
 {
-	clear_exclusive_cxl_commands(cxlds, exclusive_cmds);
+	clear_exclusive_cxl_commands(mds, exclusive_cmds);
 }
 
 static void unregister_nvdimm(void *nvdimm)
@@ -65,13 +65,13 @@ static int cxl_nvdimm_probe(struct device *dev)
 	struct cxl_nvdimm *cxl_nvd = to_cxl_nvdimm(dev);
 	struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
 	struct cxl_nvdimm_bridge *cxl_nvb = cxlmd->cxl_nvb;
+	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds);
 	unsigned long flags = 0, cmd_mask = 0;
-	struct cxl_dev_state *cxlds = cxlmd->cxlds;
 	struct nvdimm *nvdimm;
 	int rc;
 
-	set_exclusive_cxl_commands(cxlds, exclusive_cmds);
-	rc = devm_add_action_or_reset(dev, clear_exclusive, cxlds);
+	set_exclusive_cxl_commands(mds, exclusive_cmds);
+	rc = devm_add_action_or_reset(dev, clear_exclusive, mds);
 	if (rc)
 		return rc;
 
@@ -100,22 +100,23 @@ static struct cxl_driver cxl_nvdimm_driver = {
 	},
 };
 
-static int cxl_pmem_get_config_size(struct cxl_dev_state *cxlds,
+static int cxl_pmem_get_config_size(struct cxl_memdev_state *mds,
 				    struct nd_cmd_get_config_size *cmd,
 				    unsigned int buf_len)
 {
 	if (sizeof(*cmd) > buf_len)
 		return -EINVAL;
 
-	*cmd = (struct nd_cmd_get_config_size) {
-		 .config_size = cxlds->lsa_size,
-		 .max_xfer = cxlds->payload_size - sizeof(struct cxl_mbox_set_lsa),
+	*cmd = (struct nd_cmd_get_config_size){
+		.config_size = mds->lsa_size,
+		.max_xfer =
+			mds->payload_size - sizeof(struct cxl_mbox_set_lsa),
 	};
 
 	return 0;
 }
 
-static int cxl_pmem_get_config_data(struct cxl_dev_state *cxlds,
+static int cxl_pmem_get_config_data(struct cxl_memdev_state *mds,
 				    struct nd_cmd_get_config_data_hdr *cmd,
 				    unsigned int buf_len)
 {
@@ -140,13 +141,13 @@ static int cxl_pmem_get_config_data(struct cxl_dev_state *cxlds,
 		.payload_out = cmd->out_buf,
 	};
 
-	rc = cxl_internal_send_cmd(cxlds, &mbox_cmd);
+	rc = cxl_internal_send_cmd(mds, &mbox_cmd);
 	cmd->status = 0;
 
 	return rc;
 }
 
-static int cxl_pmem_set_config_data(struct cxl_dev_state *cxlds,
+static int cxl_pmem_set_config_data(struct cxl_memdev_state *mds,
 				    struct nd_cmd_set_config_hdr *cmd,
 				    unsigned int buf_len)
 {
@@ -176,7 +177,7 @@ static int cxl_pmem_set_config_data(struct cxl_dev_state *cxlds,
 		.size_in = struct_size(set_lsa, data, cmd->in_length),
 	};
 
-	rc = cxl_internal_send_cmd(cxlds, &mbox_cmd);
+	rc = cxl_internal_send_cmd(mds, &mbox_cmd);
 
 	/*
 	 * Set "firmware" status (4-packed bytes at the end of the input
@@ -194,18 +195,18 @@ static int cxl_pmem_nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd,
 	struct cxl_nvdimm *cxl_nvd = nvdimm_provider_data(nvdimm);
 	unsigned long cmd_mask = nvdimm_cmd_mask(nvdimm);
 	struct cxl_memdev *cxlmd = cxl_nvd->cxlmd;
-	struct cxl_dev_state *cxlds = cxlmd->cxlds;
+	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds);
 
 	if (!test_bit(cmd, &cmd_mask))
 		return -ENOTTY;
 
 	switch (cmd) {
 	case ND_CMD_GET_CONFIG_SIZE:
-		return cxl_pmem_get_config_size(cxlds, buf, buf_len);
+		return cxl_pmem_get_config_size(mds, buf, buf_len);
 	case ND_CMD_GET_CONFIG_DATA:
-		return cxl_pmem_get_config_data(cxlds, buf, buf_len);
+		return cxl_pmem_get_config_data(mds, buf, buf_len);
 	case ND_CMD_SET_CONFIG_DATA:
-		return cxl_pmem_set_config_data(cxlds, buf, buf_len);
+		return cxl_pmem_set_config_data(mds, buf, buf_len);
 	default:
 		return -ENOTTY;
 	}