[PATCH 16/23] cxl/mbox: Convert 'enabled_cmds' to DECLARE_BITMAP

From: Dan Williams <dan.j.williams@intel.com>
To: linux-cxl@vger.kernel.org
Cc: nvdimm@lists.linux.dev, Jonathan.Cameron@huawei.com,
	ben.widawsky@intel.com, vishal.l.verma@intel.com,
	alison.schofield@intel.com, ira.weiny@intel.com
Subject: [PATCH 16/23] cxl/mbox: Convert 'enabled_cmds' to DECLARE_BITMAP
Date: Mon, 09 Aug 2021 15:29:13 -0700	[thread overview]
Message-ID: <162854815299.1980150.3524640653829717905.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
In-Reply-To: <162854806653.1980150.3354618413963083778.stgit@dwillia2-desk3.amr.corp.intel.com>

Define enabled_cmds as an embedded member of 'struct cxl_mem' rather
than a pointer to another dynamic allocation.

As this leaves only one user of cxl_cmd_count, just open code it and
delete the helper.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/cxl/core/mbox.c |   10 +---------
 drivers/cxl/cxlmem.h    |    2 +-
 2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 40f051956990..23100231e246 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -322,8 +322,6 @@ static int cxl_validate_cmd_from_user(struct cxl_mem *cxlm,
 	return 0;
 }
 
-#define cxl_cmd_count ARRAY_SIZE(cxl_mem_commands)
-
 int cxl_query_cmd(struct cxl_memdev *cxlmd,
 		  struct cxl_mem_query_commands __user *q)
 {
@@ -339,7 +337,7 @@ int cxl_query_cmd(struct cxl_memdev *cxlmd,
 
 	/* returns the total number if 0 elements are requested. */
 	if (n_commands == 0)
-		return put_user(cxl_cmd_count, &q->n_commands);
+		return put_user(ARRAY_SIZE(cxl_mem_commands), &q->n_commands);
 
 	/*
 	 * otherwise, return max(n_commands, total commands) cxl_command_info
@@ -803,12 +801,6 @@ struct cxl_mem *cxl_mem_create(struct device *dev)
 
 	mutex_init(&cxlm->mbox_mutex);
 	cxlm->dev = dev;
-	cxlm->enabled_cmds =
-		devm_kmalloc_array(dev, BITS_TO_LONGS(cxl_cmd_count),
-				   sizeof(unsigned long),
-				   GFP_KERNEL | __GFP_ZERO);
-	if (!cxlm->enabled_cmds)
-		return ERR_PTR(-ENOMEM);
 
 	return cxlm;
 }
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index b7122ded3a04..df4f3636a999 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -116,7 +116,7 @@ struct cxl_mem {
 	size_t lsa_size;
 	struct mutex mbox_mutex; /* Protects device mailbox and firmware */
 	char firmware_version[0x10];
-	unsigned long *enabled_cmds;
+	DECLARE_BITMAP(enabled_cmds, CXL_MEM_COMMAND_ID_MAX);
 
 	struct range pmem_range;
 	struct range ram_range;

