Merge branch 'gs201-release' to android13-gs-pixel-5.10

    * gs201-release:

      gxp: Fix multicore VDs not shutting down clean
      Bug: 215303765
      gxp: Rework VD locking and remove mailbox locking
      Bug: 189018271
      gxp: initial commit for thermal driver
      Bug: 177217526
      gxp: Add wakelock interface and make debugfs wakelock aware
      Bug: 215192870
      gxp: Hook-up pm ops for driver suspend/resume
      Bug: 204924965
      gxp: Dynamically power BLK_AUR on and off
      Bug: 204924965
      gxp: support GXP_PLATFORM=GEM5
      Bug: 204942713
      gxp: Remove delay waiting for FW mailbox init
      Bug: 207037428
      gxp: Fix infrequent crash during mailbox release
      gxp: Release FW file on firmware loading errors
      gxp: return GXP_RESP_CANCELLED if timeout occurs
      Bug: 207432733
      gxp: Remove initial 10ms delay when disabling telemetry
      gxp: Cast telemetry buffer IOVAs to u32s before use
      gxp: check sscoredump by CONFIG_SUBSYSTEM_COREDUMP
      gxp: Fix double-lock hang in gxp_telemetry_vma_close
      gxp: Log driver git commit hash on probe
      Bug: 206744969
      gxp: Add ioctl for reading the TOP global counter
      gxp: Implement eventfd signalling for telemetry
      gxp: Notify running cores of telemetry state changes
      gxp: Add notification interface

Signed-off-by: Neela Chithirala <chithiralan@google.com>
Change-Id: Ic7cd7b81ee643371c600ac208ae33d6344ed7f1b

1 files changed, 128 insertions, 0 deletions

diff --git a/gxp-wakelock.c b/gxp-wakelock.c
new file mode 100644
index 0000000..feb5c88
--- /dev/null
+++ b/gxp-wakelock.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GXP wakelock support
+ *
+ * Copyright (C) 2022 Google LLC
+ */
+
+#include "gxp-dma.h"
+#include "gxp-pm.h"
+#include "gxp-wakelock.h"
+
+int gxp_wakelock_init(struct gxp_dev *gxp)
+{
+	struct gxp_wakelock_manager *mgr;
+
+	mgr = devm_kzalloc(gxp->dev, sizeof(*mgr), GFP_KERNEL);
+	if (!mgr)
+		return -ENOMEM;
+
+	mutex_init(&mgr->lock);
+
+	gxp->wakelock_mgr = mgr;
+
+	return 0;
+}
+
+int gxp_wakelock_acquire(struct gxp_dev *gxp)
+{
+	struct gxp_wakelock_manager *mgr = gxp->wakelock_mgr;
+	int ret = 0;
+
+	mutex_lock(&mgr->lock);
+
+	if (mgr->suspended) {
+		/*
+		 * Don't allow a new client to obtain a wakelock, powering up
+		 * BLK_AUR, when the system is going to sleep.
+		 */
+		dev_warn(gxp->dev,
+			 "Attempt to obtain wakelock while suspending.\n");
+		ret = -EAGAIN;
+		goto out;
+	}
+
+	if (!mgr->count++) {
+		ret = gxp_pm_blk_on(gxp);
+		if (ret) {
+			dev_err(gxp->dev,
+				"Failed to power on BLK_AUR (ret=%d, client count=%u)\n",
+				ret, mgr->count);
+			goto err_blk_on;
+		}
+
+		ret = gxp_dma_ssmt_program(gxp);
+		if (ret) {
+			dev_err(gxp->dev,
+				"Failed to program SSMTs after powering on BLK_AUR (ret=%d)\n",
+				ret);
+			goto err_ssmt_program;
+		}
+	}
+
+out:
+	mutex_unlock(&mgr->lock);
+
+	return ret;
+
+err_ssmt_program:
+	gxp_pm_blk_off(gxp);
+err_blk_on:
+	mgr->count--;
+	mutex_unlock(&mgr->lock);
+	return ret;
+}
+
+void gxp_wakelock_release(struct gxp_dev *gxp)
+{
+	struct gxp_wakelock_manager *mgr = gxp->wakelock_mgr;
+	int ret = 0;
+
+	mutex_lock(&mgr->lock);
+
+	if (!mgr->count) {
+		dev_err(gxp->dev,
+			"Attempt to release wakelock with none held.\n");
+		goto out;
+	}
+
+	if (!--mgr->count) {
+		ret = gxp_pm_blk_off(gxp);
+		if (ret)
+			dev_err(gxp->dev,
+				"Failed to power down BLK_AUR (ret=%d, client count=%u)\n",
+				ret, mgr->count);
+	}
+
+out:
+	mutex_unlock(&mgr->lock);
+}
+
+int gxp_wakelock_suspend(struct gxp_dev *gxp)
+{
+	struct gxp_wakelock_manager *mgr = gxp->wakelock_mgr;
+	int ret;
+
+	mutex_lock(&mgr->lock);
+
+	/* Can't suspend if there are any active clients */
+	mgr->suspended = mgr->count == 0;
+	ret = mgr->suspended ? 0 : -EAGAIN;
+
+	mutex_unlock(&mgr->lock);
+
+	return ret;
+}
+
+int gxp_wakelock_resume(struct gxp_dev *gxp)
+{
+	struct gxp_wakelock_manager *mgr = gxp->wakelock_mgr;
+
+	mutex_lock(&mgr->lock);
+
+	mgr->suspended = false;
+
+	mutex_unlock(&mgr->lock);
+
+	return 0;
+}