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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Tue, 8 May 2018 11:08:19 +0300
Subject: [PATCH] mei: hbm: add capabilities message
The HBM capabilities command allows performing
capabilities handshake between FW and a host driver.
The capabilities command is supported on the firmwares with
HBM version 2.2 and bigger.
Change-Id: Ie4a85a52c51b722d18d3e94455086d80148c6719
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/debugfs.c | 2 +
drivers/misc/mei/hbm.c | 79 ++++++++++++++++++++++++++++++++++++++
drivers/misc/mei/hbm.h | 2 +
drivers/misc/mei/hw.h | 21 ++++++++++
drivers/misc/mei/mei_dev.h | 2 +
5 files changed, 106 insertions(+)
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index e3beb2a93f71..67689cf4e52d 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -187,6 +187,8 @@ static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf,
dev->hbm_f_dr_supported);
pos += scnprintf(buf + pos, bufsz - pos, "\tVM: %01d\n",
dev->hbm_f_vm_supported);
+ pos += scnprintf(buf + pos, bufsz - pos, "\tCAP: %01d\n",
+ dev->hbm_f_cap_supported);
}
pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n",
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 364f848be180..06d6da212c3d 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -339,6 +339,39 @@ static int mei_hbm_dma_setup_req(struct mei_device *dev)
return 0;
}
+/**
+ * mei_hbm_capabilities_req - request capabilities
+ *
+ * @dev: the device structure
+ *
+ * Return: 0 on success and < 0 on failure
+ */
+static int mei_hbm_capabilities_req(struct mei_device *dev)
+{
+ struct mei_msg_hdr mei_hdr;
+ struct hbm_capability_request req;
+ int ret;
+
+ mei_hbm_hdr(&mei_hdr, sizeof(req));
+
+ memset(&req, 0, sizeof(req));
+ req.hbm_cmd = MEI_HBM_CAPABILITIES_REQ_CMD;
+ if (dev->hbm_f_vm_supported)
+ req.capability_requested[0] = HBM_CAP_VM;
+
+ ret = mei_hbm_write_message(dev, &mei_hdr, &req);
+ if (ret) {
+ dev_err(dev->dev,
+ "capabilities request write failed: ret = %d.\n", ret);
+ return ret;
+ }
+
+ dev->hbm_state = MEI_HBM_CAP_SETUP;
+ dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
+ mei_schedule_stall_timer(dev);
+ return 0;
+}
+
/**
* mei_hbm_enum_clients_req - sends enumeration client request message.
*
@@ -1070,6 +1103,12 @@ static void mei_hbm_config_features(struct mei_device *dev)
(dev->version.major_version == HBM_MAJOR_VERSION_VM &&
dev->version.minor_version >= HBM_MINOR_VERSION_VM))
dev->hbm_f_vm_supported = 1;
+
+ /* Capability message Support */
+ if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
+ (dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
+ dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
+ dev->hbm_f_cap_supported = 1;
}
/**
@@ -1103,6 +1142,7 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
struct hbm_host_enum_response *enum_res;
struct hbm_dma_setup_response *dma_setup_res;
struct hbm_add_client_request *add_cl_req;
+ struct hbm_capability_response *capability_res;
int ret;
struct mei_hbm_cl_cmd *cl_cmd;
@@ -1166,6 +1206,13 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
return -EPROTO;
}
+ if (dev->hbm_f_cap_supported) {
+ if (mei_hbm_capabilities_req(dev))
+ return -EIO;
+ wake_up(&dev->wait_hbm_start);
+ break;
+ }
+
if (dev->hbm_f_dr_supported) {
if (mei_dmam_ring_alloc(dev))
dev_info(dev->dev, "running w/o dma ring\n");
@@ -1187,6 +1234,38 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
wake_up(&dev->wait_hbm_start);
break;
+ case MEI_HBM_CAPABILITIES_RES_CMD:
+ dev_dbg(dev->dev, "hbm: capabilities response: message received.\n");
+
+ dev->init_clients_timer = 0;
+
+ if (dev->hbm_state != MEI_HBM_CAP_SETUP) {
+ dev_err(dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
+ dev->dev_state, dev->hbm_state);
+ return -EPROTO;
+ }
+
+ capability_res = (struct hbm_capability_response *)mei_msg;
+ if (!(capability_res->capability_granted[0] & HBM_CAP_VM))
+ dev->hbm_f_vm_supported = 0;
+
+ if (dev->hbm_f_dr_supported) {
+ if (mei_dmam_ring_alloc(dev))
+ dev_info(dev->dev, "running w/o dma ring\n");
+ if (mei_dma_ring_is_allocated(dev)) {
+ if (mei_hbm_dma_setup_req(dev))
+ return -EIO;
+ break;
+ }
+ }
+
+ dev->hbm_f_dr_supported = 0;
+ mei_dmam_ring_free(dev);
+
+ if (mei_hbm_enum_clients_req(dev))
+ return -EIO;
+ break;
+
case MEI_HBM_DMA_SETUP_RES_CMD:
dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
diff --git a/drivers/misc/mei/hbm.h b/drivers/misc/mei/hbm.h
index 0171a7e79bab..df1515fde478 100644
--- a/drivers/misc/mei/hbm.h
+++ b/drivers/misc/mei/hbm.h
@@ -26,6 +26,7 @@ struct mei_cl;
*
* @MEI_HBM_IDLE : protocol not started
* @MEI_HBM_STARTING : start request message was sent
+ * @MEI_HBM_CAP_SETUP : capabilities request message was sent
* @MEI_HBM_DR_SETUP : dma ring setup request message was sent
* @MEI_HBM_ENUM_CLIENTS : enumeration request was sent
* @MEI_HBM_CLIENT_PROPERTIES : acquiring clients properties
@@ -35,6 +36,7 @@ struct mei_cl;
enum mei_hbm_state {
MEI_HBM_IDLE = 0,
MEI_HBM_STARTING,
+ MEI_HBM_CAP_SETUP,
MEI_HBM_DR_SETUP,
MEI_HBM_ENUM_CLIENTS,
MEI_HBM_CLIENT_PROPERTIES,
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index 69a59e3cda17..46843bc224a0 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -92,6 +92,12 @@
#define HBM_MINOR_VERSION_VM 2
#define HBM_MAJOR_VERSION_VM 2
+/*
+ * MEI version with capabilities message support
+ */
+#define HBM_MINOR_VERSION_CAP 2
+#define HBM_MAJOR_VERSION_CAP 2
+
/* Host bus message command opcode */
#define MEI_HBM_CMD_OP_MSK 0x7f
/* Host bus message command RESPONSE */
@@ -137,6 +143,9 @@
#define MEI_HBM_DMA_SETUP_REQ_CMD 0x12
#define MEI_HBM_DMA_SETUP_RES_CMD 0x92
+#define MEI_HBM_CAPABILITIES_REQ_CMD 0x13
+#define MEI_HBM_CAPABILITIES_RES_CMD 0x93
+
/*
* MEI Stop Reason
* used by hbm_host_stop_request.reason
@@ -546,4 +555,16 @@ struct hbm_dma_ring_ctrl {
u32 reserved4;
} __packed;
+#define HBM_CAP_VM BIT(0)
+
+struct hbm_capability_request {
+ u8 hbm_cmd;
+ u8 capability_requested[3];
+} __packed;
+
+struct hbm_capability_response {
+ u8 hbm_cmd;
+ u8 capability_granted[3];
+} __packed;
+
#endif
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index f5110d9900f9..8cbab0f8e6a0 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -434,6 +434,7 @@ struct mei_fw_version {
* @hbm_f_os_supported : hbm feature support OS ver message
* @hbm_f_dr_supported : hbm feature dma ring supported
* @hbm_f_vm_supported : hbm feature vm tag supported
+ * @hbm_f_cap_supported : hbm feature capabilities message supported
*
* @fw_ver : FW versions
*
@@ -517,6 +518,7 @@ struct mei_device {
unsigned int hbm_f_os_supported:1;
unsigned int hbm_f_dr_supported:1;
unsigned int hbm_f_vm_supported:1;
+ unsigned int hbm_f_cap_supported:1;
struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS];
--
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