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// SPDX-License-Identifier: GPL-2.0-only
// Copyright(c) 2021 Intel Corporation. All rights reserved.
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/sizes.h>
#include <linux/bits.h>
#include <cxlmem.h>
#define LSA_SIZE SZ_128K
#define EFFECT(x) (1U << x)
static struct cxl_cel_entry mock_cel[] = {
{
.opcode = cpu_to_le16(CXL_MBOX_OP_GET_SUPPORTED_LOGS),
.effect = cpu_to_le16(0),
},
{
.opcode = cpu_to_le16(CXL_MBOX_OP_IDENTIFY),
.effect = cpu_to_le16(0),
},
{
.opcode = cpu_to_le16(CXL_MBOX_OP_GET_LSA),
.effect = cpu_to_le16(0),
},
{
.opcode = cpu_to_le16(CXL_MBOX_OP_SET_LSA),
.effect = cpu_to_le16(EFFECT(1) | EFFECT(2)),
},
};
static struct {
struct cxl_mbox_get_supported_logs gsl;
struct cxl_gsl_entry entry;
} mock_gsl_payload = {
.gsl = {
.entries = cpu_to_le16(1),
},
.entry = {
.uuid = DEFINE_CXL_CEL_UUID,
.size = cpu_to_le32(sizeof(mock_cel)),
},
};
static int mock_gsl(struct cxl_mbox_cmd *cmd)
{
if (cmd->size_out < sizeof(mock_gsl_payload))
return -EINVAL;
memcpy(cmd->payload_out, &mock_gsl_payload, sizeof(mock_gsl_payload));
cmd->size_out = sizeof(mock_gsl_payload);
return 0;
}
static int mock_get_log(struct cxl_mem *cxlm, struct cxl_mbox_cmd *cmd)
{
struct cxl_mbox_get_log *gl = cmd->payload_in;
u32 offset = le32_to_cpu(gl->offset);
u32 length = le32_to_cpu(gl->length);
uuid_t uuid = DEFINE_CXL_CEL_UUID;
void *data = &mock_cel;
if (cmd->size_in < sizeof(*gl))
return -EINVAL;
if (length > cxlm->payload_size)
return -EINVAL;
if (offset + length > sizeof(mock_cel))
return -EINVAL;
if (!uuid_equal(&gl->uuid, &uuid))
return -EINVAL;
if (length > cmd->size_out)
return -EINVAL;
memcpy(cmd->payload_out, data + offset, length);
return 0;
}
static int mock_id(struct cxl_mem *cxlm, struct cxl_mbox_cmd *cmd)
{
struct platform_device *pdev = to_platform_device(cxlm->dev);
struct cxl_mbox_identify id = {
.fw_revision = { "mock fw v1 " },
.lsa_size = cpu_to_le32(LSA_SIZE),
/* FIXME: Add partition support */
.partition_align = cpu_to_le64(0),
};
u64 capacity = 0;
int i;
if (cmd->size_out < sizeof(id))
return -EINVAL;
for (i = 0; i < 2; i++) {
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
break;
capacity += resource_size(res) / CXL_CAPACITY_MULTIPLIER;
if (le64_to_cpu(id.partition_align))
continue;
if (res->desc == IORES_DESC_PERSISTENT_MEMORY)
id.persistent_capacity = cpu_to_le64(
resource_size(res) / CXL_CAPACITY_MULTIPLIER);
else
id.volatile_capacity = cpu_to_le64(
resource_size(res) / CXL_CAPACITY_MULTIPLIER);
}
id.total_capacity = cpu_to_le64(capacity);
memcpy(cmd->payload_out, &id, sizeof(id));
return 0;
}
static int mock_get_lsa(struct cxl_mem *cxlm, struct cxl_mbox_cmd *cmd)
{
struct cxl_mbox_get_lsa *get_lsa = cmd->payload_in;
void *lsa = dev_get_drvdata(cxlm->dev);
u32 offset, length;
if (sizeof(*get_lsa) > cmd->size_in)
return -EINVAL;
offset = le32_to_cpu(get_lsa->offset);
length = le32_to_cpu(get_lsa->length);
if (offset + length > LSA_SIZE)
return -EINVAL;
if (length > cmd->size_out)
return -EINVAL;
memcpy(cmd->payload_out, lsa + offset, length);
return 0;
}
static int mock_set_lsa(struct cxl_mem *cxlm, struct cxl_mbox_cmd *cmd)
{
struct cxl_mbox_set_lsa *set_lsa = cmd->payload_in;
void *lsa = dev_get_drvdata(cxlm->dev);
u32 offset, length;
if (sizeof(*set_lsa) > cmd->size_in)
return -EINVAL;
offset = le32_to_cpu(set_lsa->offset);
length = cmd->size_in - sizeof(*set_lsa);
if (offset + length > LSA_SIZE)
return -EINVAL;
memcpy(lsa + offset, &set_lsa->data[0], length);
return 0;
}
static int cxl_mock_mbox_send(struct cxl_mem *cxlm, struct cxl_mbox_cmd *cmd)
{
struct device *dev = cxlm->dev;
int rc = -EIO;
switch (cmd->opcode) {
case CXL_MBOX_OP_GET_SUPPORTED_LOGS:
rc = mock_gsl(cmd);
break;
case CXL_MBOX_OP_GET_LOG:
rc = mock_get_log(cxlm, cmd);
break;
case CXL_MBOX_OP_IDENTIFY:
rc = mock_id(cxlm, cmd);
break;
case CXL_MBOX_OP_GET_LSA:
rc = mock_get_lsa(cxlm, cmd);
break;
case CXL_MBOX_OP_SET_LSA:
rc = mock_set_lsa(cxlm, cmd);
break;
default:
break;
}
dev_dbg(dev, "opcode: %#x sz_in: %zd sz_out: %zd rc: %d\n", cmd->opcode,
cmd->size_in, cmd->size_out, rc);
return rc;
}
static void label_area_release(void *lsa)
{
vfree(lsa);
}
static int cxl_mock_mem_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cxl_memdev *cxlmd;
struct cxl_mem *cxlm;
void *lsa;
int rc;
lsa = vmalloc(LSA_SIZE);
if (!lsa)
return -ENOMEM;
rc = devm_add_action_or_reset(dev, label_area_release, lsa);
if (rc)
return rc;
dev_set_drvdata(dev, lsa);
cxlm = cxl_mem_create(dev);
if (IS_ERR(cxlm))
return PTR_ERR(cxlm);
cxlm->mbox_send = cxl_mock_mbox_send;
cxlm->payload_size = SZ_4K;
rc = cxl_mem_enumerate_cmds(cxlm);
if (rc)
return rc;
rc = cxl_mem_identify(cxlm);
if (rc)
return rc;
rc = cxl_mem_create_range_info(cxlm);
if (rc)
return rc;
cxlmd = devm_cxl_add_memdev(cxlm);
if (IS_ERR(cxlmd))
return PTR_ERR(cxlmd);
if (range_len(&cxlm->pmem_range) && IS_ENABLED(CONFIG_CXL_PMEM))
rc = devm_cxl_add_nvdimm(dev, cxlmd);
return 0;
}
static const struct platform_device_id cxl_mock_mem_ids[] = {
{ .name = "cxl_mem", },
{ },
};
MODULE_DEVICE_TABLE(platform, cxl_mock_mem_ids);
static struct platform_driver cxl_mock_mem_driver = {
.probe = cxl_mock_mem_probe,
.id_table = cxl_mock_mem_ids,
.driver = {
.name = KBUILD_MODNAME,
},
};
module_platform_driver(cxl_mock_mem_driver);
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(CXL);
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