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Subject[char-misc-next 3/6] mei: add support for client dma capability
Date
From: Alexander Usyskin <alexander.usyskin@intel.com>

Client DMA capability indicates whether the firmware supports setting up
a direct DMA channel between the host and me client.
The DMA capabilities are supported from firmware HBM version 2.2
and newer.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/misc/mei/debugfs.c | 1 +
drivers/misc/mei/hbm.c | 13 ++++++++++++-
drivers/misc/mei/hw.h | 8 ++++++++
drivers/misc/mei/mei_dev.h | 2 ++
4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index 3ab1a431d810..1ce61e9e24fc 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -106,6 +106,7 @@ static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
seq_printf(m, "\tDR: %01d\n", dev->hbm_f_dr_supported);
seq_printf(m, "\tVT: %01d\n", dev->hbm_f_vt_supported);
seq_printf(m, "\tCAP: %01d\n", dev->hbm_f_cap_supported);
+ seq_printf(m, "\tCD: %01d\n", dev->hbm_f_cd_supported);
}

seq_printf(m, "pg: %s, %s\n",
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index df0f62de3dca..6e748da7e55d 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -339,7 +339,9 @@ static int mei_hbm_capabilities_req(struct mei_device *dev)
memset(&req, 0, sizeof(req));
req.hbm_cmd = MEI_HBM_CAPABILITIES_REQ_CMD;
if (dev->hbm_f_vt_supported)
- req.capability_requested[0] = HBM_CAP_VT;
+ req.capability_requested[0] |= HBM_CAP_VT;
+ if (dev->hbm_f_cd_supported)
+ req.capability_requested[0] |= HBM_CAP_CD;

ret = mei_hbm_write_message(dev, &mei_hdr, &req);
if (ret) {
@@ -1085,6 +1087,13 @@ static void mei_hbm_config_features(struct mei_device *dev)
(dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
dev->hbm_f_cap_supported = 1;
+
+ /* Client DMA Support */
+ dev->hbm_f_cd_supported = 0;
+ if (dev->version.major_version > HBM_MAJOR_VERSION_CD ||
+ (dev->version.major_version == HBM_MAJOR_VERSION_CD &&
+ dev->version.minor_version >= HBM_MINOR_VERSION_CD))
+ dev->hbm_f_cd_supported = 1;
}

/**
@@ -1233,6 +1242,8 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
capability_res = (struct hbm_capability_response *)mei_msg;
if (!(capability_res->capability_granted[0] & HBM_CAP_VT))
dev->hbm_f_vt_supported = 0;
+ if (!(capability_res->capability_granted[0] & HBM_CAP_CD))
+ dev->hbm_f_cd_supported = 0;

if (dev->hbm_f_dr_supported) {
if (mei_dmam_ring_alloc(dev))
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h
index df2fb9520dd8..9577a2cc0733 100644
--- a/drivers/misc/mei/hw.h
+++ b/drivers/misc/mei/hw.h
@@ -88,6 +88,12 @@
#define HBM_MINOR_VERSION_CAP 2
#define HBM_MAJOR_VERSION_CAP 2

+/*
+ * MEI version with client DMA support
+ */
+#define HBM_MINOR_VERSION_CD 2
+#define HBM_MAJOR_VERSION_CD 2
+
/* Host bus message command opcode */
#define MEI_HBM_CMD_OP_MSK 0x7f
/* Host bus message command RESPONSE */
@@ -648,6 +654,8 @@ struct hbm_dma_ring_ctrl {

/* virtual tag supported */
#define HBM_CAP_VT BIT(0)
+/* client dma supported */
+#define HBM_CAP_CD BIT(2)

/**
* struct hbm_capability_request - capability request from host to fw
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 585a6f615bf8..8ebd32cb2075 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -451,6 +451,7 @@ struct mei_fw_version {
* @hbm_f_dr_supported : hbm feature dma ring supported
* @hbm_f_vt_supported : hbm feature vtag supported
* @hbm_f_cap_supported : hbm feature capabilities message supported
+ * @hbm_f_cd_supported : hbm feature client dma supported
*
* @fw_ver : FW versions
*
@@ -538,6 +539,7 @@ struct mei_device {
unsigned int hbm_f_dr_supported:1;
unsigned int hbm_f_vt_supported:1;
unsigned int hbm_f_cap_supported:1;
+ unsigned int hbm_f_cd_supported:1;

struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS];

--
2.26.2
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