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Date: Tue, 21 Nov 2023 18:18:35 +0800
From: <shiju.jose@...wei.com>
To: <linux-cxl@...r.kernel.org>, <linux-mm@...ck.org>,
<dave@...olabs.net>, <jonathan.cameron@...wei.com>,
<dave.jiang@...el.com>, <alison.schofield@...el.com>,
<vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
<dan.j.williams@...el.com>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<david@...hat.com>, <Vilas.Sridharan@....com>, <leo.duran@....com>,
<Yazen.Ghannam@....com>, <rientjes@...gle.com>,
<jiaqiyan@...gle.com>, <tony.luck@...el.com>, <Jon.Grimm@....com>,
<dave.hansen@...ux.intel.com>, <rafael@...nel.org>,
<lenb@...nel.org>, <naoya.horiguchi@....com>,
<james.morse@....com>, <jthoughton@...gle.com>,
<somasundaram.a@....com>, <erdemaktas@...gle.com>,
<pgonda@...gle.com>, <duenwen@...gle.com>,
<mike.malvestuto@...el.com>, <gthelen@...gle.com>,
<wschwartz@...erecomputing.com>, <dferguson@...erecomputing.com>,
<tanxiaofei@...wei.com>, <prime.zeng@...ilicon.com>,
<kangkang.shen@...urewei.com>, <wanghuiqiang@...wei.com>,
<linuxarm@...wei.com>, <shiju.jose@...wei.com>
Subject: [PATCH v2 02/10] cxl/mbox: Add GET_FEATURE mailbox command
From: Shiju Jose <shiju.jose@...wei.com>
Add support for GET_FEATURE mailbox command.
CXL spec 3.0 section 8.2.9.6 describes optional device specific features.
The settings of a feature can be retrieved using Get Feature command.
Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
---
drivers/cxl/core/mbox.c | 23 +++++++++++++++++++++++
drivers/cxl/cxlmem.h | 23 +++++++++++++++++++++++
include/uapi/linux/cxl_mem.h | 1 +
3 files changed, 47 insertions(+)
diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 06ec9ef50e7f..2675c616caec 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -64,6 +64,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = {
CXL_CMD(SET_SHUTDOWN_STATE, 0x1, 0, 0),
CXL_CMD(GET_SCAN_MEDIA_CAPS, 0x10, 0x4, 0),
CXL_CMD(GET_SUPPORTED_FEATURES, 0x8, CXL_VARIABLE_PAYLOAD, 0),
+ CXL_CMD(GET_FEATURE, 0x15, CXL_VARIABLE_PAYLOAD, 0),
};
/*
@@ -1327,6 +1328,28 @@ int cxl_get_supported_features(struct cxl_memdev_state *mds,
}
EXPORT_SYMBOL_NS_GPL(cxl_get_supported_features, CXL);
+int cxl_get_feature(struct cxl_memdev_state *mds,
+ struct cxl_mbox_get_feat_in *pi, void *feat_out)
+{
+ struct cxl_mbox_cmd mbox_cmd;
+ int rc;
+
+ mbox_cmd = (struct cxl_mbox_cmd) {
+ .opcode = CXL_MBOX_OP_GET_FEATURE,
+ .size_in = sizeof(*pi),
+ .payload_in = pi,
+ .size_out = pi->count,
+ .payload_out = feat_out,
+ .min_out = pi->count,
+ };
+ rc = cxl_internal_send_cmd(mds, &mbox_cmd);
+ if (rc < 0)
+ return rc;
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_get_feature, CXL);
+
int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
struct cxl_region *cxlr)
{
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index d831dad748f5..92c1f2a44713 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -507,6 +507,7 @@ enum cxl_opcode {
CXL_MBOX_OP_GET_SUPPORTED_LOGS = 0x0400,
CXL_MBOX_OP_GET_LOG = 0x0401,
CXL_MBOX_OP_GET_SUPPORTED_FEATURES = 0x0500,
+ CXL_MBOX_OP_GET_FEATURE = 0x0501,
CXL_MBOX_OP_IDENTIFY = 0x4000,
CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100,
CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101,
@@ -796,6 +797,26 @@ struct cxl_mbox_get_supp_feats_out {
struct cxl_mbox_supp_feat_entry feat_entries[];
} __packed;
+/* Get Feature CXL 3.0 Spec 8.2.9.6.2 */
+/*
+ * Get Feature input payload
+ * CXL rev 3.0 section 8.2.9.6.2; Table 8-79
+ */
+/* Get Feature : Payload in selection */
+enum cxl_get_feat_selection {
+ CXL_GET_FEAT_SEL_CURRENT_VALUE = 0x0,
+ CXL_GET_FEAT_SEL_DEFAULT_VALUE = 0x1,
+ CXL_GET_FEAT_SEL_SAVED_VALUE = 0x2,
+ CXL_GET_FEAT_SEL_MAX
+};
+
+struct cxl_mbox_get_feat_in {
+ uuid_t uuid;
+ __le16 offset;
+ __le16 count;
+ u8 selection;
+} __packed;
+
/* Get Poison List CXL 3.0 Spec 8.2.9.8.4.1 */
struct cxl_mbox_poison_in {
__le64 offset;
@@ -926,6 +947,8 @@ int cxl_set_timestamp(struct cxl_memdev_state *mds);
int cxl_get_supported_features(struct cxl_memdev_state *mds,
struct cxl_mbox_get_supp_feats_in *pi,
void *feats_out);
+int cxl_get_feature(struct cxl_memdev_state *mds,
+ struct cxl_mbox_get_feat_in *pi, void *feat_out);
int cxl_poison_state_init(struct cxl_memdev_state *mds);
int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
struct cxl_region *cxlr);
diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h
index 656450274001..b20de60bfc71 100644
--- a/include/uapi/linux/cxl_mem.h
+++ b/include/uapi/linux/cxl_mem.h
@@ -47,6 +47,7 @@
___DEPRECATED(SCAN_MEDIA, "Scan Media"), \
___DEPRECATED(GET_SCAN_MEDIA, "Get Scan Media Results"), \
___C(GET_SUPPORTED_FEATURES, "Get Supported Features"), \
+ ___C(GET_FEATURE, "Get Feature"), \
___C(MAX, "invalid / last command")
#define ___C(a, b) CXL_MEM_COMMAND_ID_##a
--
2.34.1
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