[PATCH 1/3] drm/mst: switch to guid_t type for GUID
Jani Nikula
jani.nikula at intel.com
Fri May 31 12:00:31 UTC 2024
The kernel has a guid_t type for GUIDs. Switch to using it, but avoid
any functional changes here.
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
drivers/gpu/drm/display/drm_dp_mst_topology.c | 67 +++++++++++--------
include/drm/display/drm_dp_mst_helper.h | 12 ++--
3 files changed, 45 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 516eb3968e26..65ebc01dc90f 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2445,7 +2445,7 @@ static void resume_mst_branch_status(struct drm_dp_mst_topology_mgr *mgr)
}
}
- memcpy(mgr->mst_primary->guid, guid, 16);
+ import_guid(&mgr->mst_primary->guid, guid);
out_fail:
mutex_unlock(&mgr->lock);
diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c
index 7f8e1cfbe19d..9b1f35b1a2da 100644
--- a/drivers/gpu/drm/display/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c
@@ -89,7 +89,7 @@ static int drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_branch *mstb,
struct drm_dp_mst_port *port);
static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
- u8 *guid);
+ guid_t *guid);
static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port);
static void drm_dp_mst_unregister_i2c_bus(struct drm_dp_mst_port *port);
@@ -801,7 +801,7 @@ static bool drm_dp_sideband_parse_link_address(const struct drm_dp_mst_topology_
int idx = 1;
int i;
- memcpy(repmsg->u.link_addr.guid, &raw->msg[idx], 16);
+ import_guid(&repmsg->u.link_addr.guid, &raw->msg[idx]);
idx += 16;
repmsg->u.link_addr.nports = raw->msg[idx] & 0xf;
idx++;
@@ -829,7 +829,7 @@ static bool drm_dp_sideband_parse_link_address(const struct drm_dp_mst_topology_
idx++;
if (idx > raw->curlen)
goto fail_len;
- memcpy(repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx], 16);
+ import_guid(&repmsg->u.link_addr.ports[i].peer_guid, &raw->msg[idx]);
idx += 16;
if (idx > raw->curlen)
goto fail_len;
@@ -1029,7 +1029,7 @@ static bool drm_dp_sideband_parse_reply(const struct drm_dp_mst_topology_mgr *mg
msg->req_type = (raw->msg[0] & 0x7f);
if (msg->reply_type == DP_SIDEBAND_REPLY_NAK) {
- memcpy(msg->u.nak.guid, &raw->msg[1], 16);
+ import_guid(&msg->u.nak.guid, &raw->msg[1]);
msg->u.nak.reason = raw->msg[17];
msg->u.nak.nak_data = raw->msg[18];
return false;
@@ -1078,7 +1078,7 @@ drm_dp_sideband_parse_connection_status_notify(const struct drm_dp_mst_topology_
if (idx > raw->curlen)
goto fail_len;
- memcpy(msg->u.conn_stat.guid, &raw->msg[idx], 16);
+ import_guid(&msg->u.conn_stat.guid, &raw->msg[idx]);
idx += 16;
if (idx > raw->curlen)
goto fail_len;
@@ -1107,7 +1107,7 @@ static bool drm_dp_sideband_parse_resource_status_notify(const struct drm_dp_mst
if (idx > raw->curlen)
goto fail_len;
- memcpy(msg->u.resource_stat.guid, &raw->msg[idx], 16);
+ import_guid(&msg->u.resource_stat.guid, &raw->msg[idx]);
idx += 16;
if (idx > raw->curlen)
goto fail_len;
@@ -2174,20 +2174,24 @@ ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux,
offset, size, buffer);
}
-static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid)
+static int drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, guid_t *guid)
{
int ret = 0;
- memcpy(mstb->guid, guid, 16);
+ guid_copy(&mstb->guid, guid);
+
+ if (!drm_dp_validate_guid(mstb->mgr, &mstb->guid)) {
+ u8 buf[UUID_SIZE];
+
+ export_guid(buf, &mstb->guid);
- if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) {
if (mstb->port_parent) {
ret = drm_dp_send_dpcd_write(mstb->mgr,
mstb->port_parent,
- DP_GUID, 16, mstb->guid);
+ DP_GUID, sizeof(buf), buf);
} else {
ret = drm_dp_dpcd_write(mstb->mgr->aux,
- DP_GUID, mstb->guid, 16);
+ DP_GUID, buf, sizeof(buf));
}
}
@@ -2570,9 +2574,9 @@ static struct drm_dp_mst_branch *drm_dp_get_mst_branch_device(struct drm_dp_mst_
return mstb;
}
-static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
- struct drm_dp_mst_branch *mstb,
- const uint8_t *guid)
+static struct drm_dp_mst_branch *
+get_mst_branch_device_by_guid_helper(struct drm_dp_mst_branch *mstb,
+ const guid_t *guid)
{
struct drm_dp_mst_branch *found_mstb;
struct drm_dp_mst_port *port;
@@ -2580,10 +2584,9 @@ static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
if (!mstb)
return NULL;
- if (memcmp(mstb->guid, guid, 16) == 0)
+ if (guid_equal(&mstb->guid, guid))
return mstb;
-
list_for_each_entry(port, &mstb->ports, next) {
found_mstb = get_mst_branch_device_by_guid_helper(port->mstb, guid);
@@ -2596,7 +2599,7 @@ static struct drm_dp_mst_branch *get_mst_branch_device_by_guid_helper(
static struct drm_dp_mst_branch *
drm_dp_get_mst_branch_device_by_guid(struct drm_dp_mst_topology_mgr *mgr,
- const uint8_t *guid)
+ const guid_t *guid)
{
struct drm_dp_mst_branch *mstb;
int ret;
@@ -2693,17 +2696,20 @@ static void drm_dp_mst_link_probe_work(struct work_struct *work)
}
static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr,
- u8 *guid)
+ guid_t *guid)
{
u64 salt;
+ u8 buf[UUID_SIZE];
- if (memchr_inv(guid, 0, 16))
+ if (!guid_is_null(guid))
return true;
salt = get_jiffies_64();
- memcpy(&guid[0], &salt, sizeof(u64));
- memcpy(&guid[8], &salt, sizeof(u64));
+ memcpy(&buf[0], &salt, sizeof(u64));
+ memcpy(&buf[8], &salt, sizeof(u64));
+
+ import_guid(guid, buf);
return false;
}
@@ -2943,7 +2949,7 @@ static int drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr,
drm_dbg_kms(mgr->dev, "link address reply: %d\n", reply->nports);
drm_dp_dump_link_address(mgr, reply);
- ret = drm_dp_check_mstb_guid(mstb, reply->guid);
+ ret = drm_dp_check_mstb_guid(mstb, &reply->guid);
if (ret) {
char buf[64];
@@ -3770,8 +3776,9 @@ EXPORT_SYMBOL(drm_dp_mst_topology_mgr_suspend);
int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
bool sync)
{
+ u8 buf[UUID_SIZE];
+ guid_t guid;
int ret;
- u8 guid[16];
mutex_lock(&mgr->lock);
if (!mgr->mst_primary)
@@ -3792,13 +3799,15 @@ int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr,
}
/* Some hubs forget their guids after they resume */
- ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, guid, 16);
- if (ret != 16) {
+ ret = drm_dp_dpcd_read(mgr->aux, DP_GUID, buf, sizeof(buf));
+ if (ret != sizeof(buf)) {
drm_dbg_kms(mgr->dev, "dpcd read failed - undocked during suspend?\n");
goto out_fail;
}
- ret = drm_dp_check_mstb_guid(mgr->mst_primary, guid);
+ import_guid(&guid, buf);
+
+ ret = drm_dp_check_mstb_guid(mgr->mst_primary, &guid);
if (ret) {
drm_dbg_kms(mgr->dev, "check mstb failed - undocked during suspend?\n");
goto out_fail;
@@ -3976,12 +3985,12 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr *mgr,
bool hotplug = false, dowork = false;
if (hdr->broadcast) {
- const u8 *guid = NULL;
+ const guid_t *guid = NULL;
if (msg->req_type == DP_CONNECTION_STATUS_NOTIFY)
- guid = msg->u.conn_stat.guid;
+ guid = &msg->u.conn_stat.guid;
else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY)
- guid = msg->u.resource_stat.guid;
+ guid = &msg->u.resource_stat.guid;
if (guid)
mstb = drm_dp_get_mst_branch_device_by_guid(mgr, guid);
diff --git a/include/drm/display/drm_dp_mst_helper.h b/include/drm/display/drm_dp_mst_helper.h
index cfe096389d94..dd466631f174 100644
--- a/include/drm/display/drm_dp_mst_helper.h
+++ b/include/drm/display/drm_dp_mst_helper.h
@@ -244,18 +244,18 @@ struct drm_dp_mst_branch {
bool link_address_sent;
/* global unique identifier to identify branch devices */
- u8 guid[16];
+ guid_t guid;
};
struct drm_dp_nak_reply {
- u8 guid[16];
+ guid_t guid;
u8 reason;
u8 nak_data;
};
struct drm_dp_link_address_ack_reply {
- u8 guid[16];
+ guid_t guid;
u8 nports;
struct drm_dp_link_addr_reply_port {
bool input_port;
@@ -265,7 +265,7 @@ struct drm_dp_link_address_ack_reply {
bool ddps;
bool legacy_device_plug_status;
u8 dpcd_revision;
- u8 peer_guid[16];
+ guid_t peer_guid;
u8 num_sdp_streams;
u8 num_sdp_stream_sinks;
} ports[16];
@@ -348,7 +348,7 @@ struct drm_dp_allocate_payload_ack_reply {
};
struct drm_dp_connection_status_notify {
- u8 guid[16];
+ guid_t guid;
u8 port_number;
bool legacy_device_plug_status;
bool displayport_device_plug_status;
@@ -425,7 +425,7 @@ struct drm_dp_query_payload {
struct drm_dp_resource_status_notify {
u8 port_number;
- u8 guid[16];
+ guid_t guid;
u16 available_pbn;
};
--
2.39.2
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