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Message-ID: <20250106121017.1620-13-shiju.jose@huawei.com>
Date: Mon, 6 Jan 2025 12:10:08 +0000
From: <shiju.jose@...wei.com>
To: <linux-edac@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
<linux-acpi@...r.kernel.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>
CC: <bp@...en8.de>, <tony.luck@...el.com>, <rafael@...nel.org>,
<lenb@...nel.org>, <mchehab@...nel.org>, <dan.j.williams@...el.com>,
<dave@...olabs.net>, <jonathan.cameron@...wei.com>, <dave.jiang@...el.com>,
<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
<ira.weiny@...el.com>, <david@...hat.com>, <Vilas.Sridharan@....com>,
<leo.duran@....com>, <Yazen.Ghannam@....com>, <rientjes@...gle.com>,
<jiaqiyan@...gle.com>, <Jon.Grimm@....com>, <dave.hansen@...ux.intel.com>,
<naoya.horiguchi@....com>, <james.morse@....com>, <jthoughton@...gle.com>,
<somasundaram.a@....com>, <erdemaktas@...gle.com>, <pgonda@...gle.com>,
<duenwen@...gle.com>, <gthelen@...gle.com>, <wschwartz@...erecomputing.com>,
<dferguson@...erecomputing.com>, <wbs@...amperecomputing.com>,
<nifan.cxl@...il.com>, <yazen.ghannam@....com>, <tanxiaofei@...wei.com>,
<prime.zeng@...ilicon.com>, <roberto.sassu@...wei.com>,
<kangkang.shen@...urewei.com>, <wanghuiqiang@...wei.com>,
<linuxarm@...wei.com>, <shiju.jose@...wei.com>
Subject: [PATCH v18 12/19] cxl/mbox: Add GET_FEATURE mailbox command
From: Shiju Jose <shiju.jose@...wei.com>
Add support for GET_FEATURE mailbox command.
CXL spec 3.1 section 8.2.9.6 describes optional device specific features.
The settings of a feature can be retrieved using Get Feature command.
CXL spec 3.1 section 8.2.9.6.2 describes Get Feature command.
Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
---
drivers/cxl/core/features.c | 74 +++++++++++++++++++++++++++++++++++++
drivers/cxl/features.c | 6 +--
include/cxl/features.h | 27 ++++++++++++++
3 files changed, 102 insertions(+), 5 deletions(-)
diff --git a/drivers/cxl/core/features.c b/drivers/cxl/core/features.c
index 66a4b82910e6..ab9386b53a95 100644
--- a/drivers/cxl/core/features.c
+++ b/drivers/cxl/core/features.c
@@ -4,6 +4,7 @@
#include <cxl/mailbox.h>
#include "cxl.h"
#include "core.h"
+#include "cxlmem.h"
#define CXL_FEATURE_MAX_DEVS 65536
static DEFINE_IDA(cxl_features_ida);
@@ -97,3 +98,76 @@ cxl_get_supported_feature_entry(struct cxl_features *features,
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL_NS_GPL(cxl_get_supported_feature_entry, "CXL");
+
+bool cxl_feature_enabled(struct cxl_features_state *cfs, u16 opcode)
+{
+ struct cxl_mailbox *cxl_mbox = cfs->features->cxl_mbox;
+ struct cxl_mem_command *cmd;
+
+ cmd = cxl_find_feature_command(opcode);
+ if (!cmd)
+ return false;
+
+ return test_bit(cmd->info.id, cxl_mbox->feature_cmds);
+}
+EXPORT_SYMBOL_NS_GPL(cxl_feature_enabled, "CXL");
+
+size_t cxl_get_feature(struct cxl_features *features, const uuid_t feat_uuid,
+ enum cxl_get_feat_selection selection,
+ void *feat_out, size_t feat_out_size, u16 offset,
+ u16 *return_code)
+{
+ size_t data_to_rd_size, size_out;
+ struct cxl_features_state *cfs;
+ struct cxl_mbox_get_feat_in pi;
+ struct cxl_mailbox *cxl_mbox;
+ struct cxl_mbox_cmd mbox_cmd;
+ size_t data_rcvd_size = 0;
+ int rc;
+
+ if (return_code)
+ *return_code = CXL_MBOX_CMD_RC_INPUT;
+
+ cfs = dev_get_drvdata(&features->dev);
+ if (!cfs)
+ return 0;
+
+ if (!cxl_feature_enabled(cfs, CXL_MBOX_OP_GET_FEATURE))
+ return 0;
+
+ if (!feat_out || !feat_out_size)
+ return 0;
+
+ cxl_mbox = features->cxl_mbox;
+ size_out = min(feat_out_size, cxl_mbox->payload_size);
+ pi.uuid = feat_uuid;
+ pi.selection = selection;
+ do {
+ data_to_rd_size = min(feat_out_size - data_rcvd_size,
+ cxl_mbox->payload_size);
+ pi.offset = cpu_to_le16(offset + data_rcvd_size);
+ pi.count = cpu_to_le16(data_to_rd_size);
+
+ mbox_cmd = (struct cxl_mbox_cmd) {
+ .opcode = CXL_MBOX_OP_GET_FEATURE,
+ .size_in = sizeof(pi),
+ .payload_in = &pi,
+ .size_out = size_out,
+ .payload_out = feat_out + data_rcvd_size,
+ .min_out = data_to_rd_size,
+ };
+ rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd);
+ if (rc < 0 || !mbox_cmd.size_out) {
+ if (return_code)
+ *return_code = mbox_cmd.return_code;
+ return 0;
+ }
+ data_rcvd_size += mbox_cmd.size_out;
+ } while (data_rcvd_size < feat_out_size);
+
+ if (return_code)
+ *return_code = CXL_MBOX_CMD_RC_SUCCESS;
+
+ return data_rcvd_size;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_get_feature, "CXL");
diff --git a/drivers/cxl/features.c b/drivers/cxl/features.c
index 2f0fb072921e..2faa9e03a840 100644
--- a/drivers/cxl/features.c
+++ b/drivers/cxl/features.c
@@ -47,14 +47,10 @@ static int cxl_get_supported_features(struct cxl_features_state *cfs)
struct cxl_mbox_get_sup_feats_in mbox_in;
struct cxl_feat_entry *entry;
struct cxl_mbox_cmd mbox_cmd;
- struct cxl_mem_command *cmd;
int count;
/* Get supported features is optional, need to check */
- cmd = cxl_find_feature_command(CXL_MBOX_OP_GET_SUPPORTED_FEATURES);
- if (!cmd)
- return -EOPNOTSUPP;
- if (!test_bit(cmd->info.id, cxl_mbox->feature_cmds))
+ if (!cxl_feature_enabled(cfs, CXL_MBOX_OP_GET_SUPPORTED_FEATURES))
return -EOPNOTSUPP;
count = cxl_get_supported_features_count(cxl_mbox);
diff --git a/include/cxl/features.h b/include/cxl/features.h
index 429b9782667c..582fb85da5b9 100644
--- a/include/cxl/features.h
+++ b/include/cxl/features.h
@@ -53,10 +53,37 @@ struct cxl_features_state {
struct cxl_feat_entry *entries;
};
+/*
+ * Get Feature CXL 3.1 Spec 8.2.9.6.2
+ */
+
+/*
+ * Get Feature input payload
+ * CXL rev 3.1 section 8.2.9.6.2 Table 8-99
+ */
+enum cxl_get_feat_selection {
+ CXL_GET_FEAT_SEL_CURRENT_VALUE,
+ CXL_GET_FEAT_SEL_DEFAULT_VALUE,
+ CXL_GET_FEAT_SEL_SAVED_VALUE,
+ CXL_GET_FEAT_SEL_MAX
+};
+
+struct cxl_mbox_get_feat_in {
+ uuid_t uuid;
+ __le16 offset;
+ __le16 count;
+ u8 selection;
+} __packed;
+
+bool cxl_feature_enabled(struct cxl_features_state *cfs, u16 opcode);
struct cxl_features *cxl_features_alloc(struct cxl_mailbox *cxl_mbox,
struct device *parent);
struct cxl_feat_entry *
cxl_get_supported_feature_entry(struct cxl_features *features,
const uuid_t *feat_uuid);
+size_t cxl_get_feature(struct cxl_features *features, const uuid_t feat_uuid,
+ enum cxl_get_feat_selection selection,
+ void *feat_out, size_t feat_out_size, u16 offset,
+ u16 *return_code);
#endif
--
2.43.0
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