This commit is dedicacted to MALI, UMP and MALI_DRM. This includes MALI-r3p2 from other source

1 files changed, 604 insertions, 0 deletions

diff --git a/drivers/gpu/mali/umplock/umplock_driver.c b/drivers/gpu/mali/umplock/umplock_driver.c
new file mode 100644
index 00000000..825f16fa
--- /dev/null
+++ b/drivers/gpu/mali/umplock/umplock_driver.c
@@ -0,0 +1,604 @@
+/*
+ * Copyright (C) 2012-2014 ARM Limited. All rights reserved.
+ * 
+ * This program is free software and is provided to you under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
+ * 
+ * A copy of the licence is included with the program, and can also be obtained from Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <asm/uaccess.h>
+#include "umplock_ioctl.h"
+#include <linux/sched.h>
+
+#define MAX_ITEMS 1024
+#define MAX_PIDS 128
+
+typedef struct lock_cmd_priv {
+	uint32_t msg[128];    /*ioctl args*/
+	u32 pid;              /*process id*/
+} _lock_cmd_priv;
+
+typedef struct lock_ref {
+	int ref_count;
+	u32 pid;
+} _lock_ref;
+
+typedef struct umplock_item {
+	u32 secure_id;
+	u32 id_ref_count;
+	u32 owner;
+	_lock_access_usage usage;
+	_lock_ref references[MAX_PIDS];
+	struct semaphore item_lock;
+} umplock_item;
+
+typedef struct umplock_device_private {
+	struct mutex item_list_lock;
+	atomic_t sessions;
+	umplock_item items[MAX_ITEMS];
+	u32 pids[MAX_PIDS];
+} umplock_device_private;
+
+struct umplock_device {
+	struct cdev cdev;
+	struct class *umplock_class;
+};
+
+static struct umplock_device umplock_device;
+static umplock_device_private device;
+static dev_t umplock_dev;
+static char umplock_dev_name[] = "umplock";
+
+int umplock_debug_level = 0;
+module_param(umplock_debug_level, int, S_IRUSR | S_IWUSR | S_IWGRP | S_IRGRP | S_IROTH); /* rw-rw-r-- */
+MODULE_PARM_DESC(umplock_debug_level, "set umplock_debug_level to print debug messages");
+
+#define PDEBUG(level, fmt, args...) do { if ((level) <= umplock_debug_level) printk(KERN_DEBUG "umplock: " fmt, ##args); } while (0)
+#define PERROR(fmt, args...) do { printk(KERN_ERR "umplock: " fmt, ##args); } while (0)
+
+int umplock_find_item(u32 secure_id)
+{
+	int i;
+	for (i = 0; i < MAX_ITEMS; i++) {
+		if (device.items[i].secure_id == secure_id) {
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+static int umplock_find_item_by_pid(_lock_cmd_priv *lock_cmd, int *item_slot, int *ref_slot)
+{
+	_lock_item_s *lock_item;
+	int i, j;
+
+	lock_item = (_lock_item_s *)&lock_cmd->msg;
+
+	i = umplock_find_item(lock_item->secure_id);
+
+	if (i < 0) {
+		return -1;
+	}
+
+	for (j = 0; j < MAX_PIDS; j++) {
+		if (device.items[i].references[j].pid == lock_cmd->pid) {
+			*item_slot = i;
+			*ref_slot = j;
+			return 0;
+		}
+	}
+	return -1 ;
+}
+
+static int umplock_find_client_valid(u32 pid)
+{
+	int i;
+
+	if (pid == 0) {
+		return -1;
+	}
+
+	for (i = 0; i < MAX_PIDS; i++) {
+		if (device.pids[i] == pid) {
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+static int do_umplock_create_locked(_lock_cmd_priv *lock_cmd)
+{
+	int i_index, ref_index;
+	int ret;
+	_lock_item_s *lock_item = (_lock_item_s *)&lock_cmd->msg;
+
+	i_index = ref_index = -1;
+
+	ret = umplock_find_client_valid(lock_cmd->pid);
+	if (ret < 0) {
+		/*lock request from an invalid client pid, do nothing*/
+		return -EINVAL;
+	}
+
+	ret = umplock_find_item_by_pid(lock_cmd, &i_index, &ref_index);
+	if (ret >= 0) {
+	} else if ((i_index = umplock_find_item(lock_item->secure_id)) >= 0) {
+		for (ref_index = 0; ref_index < MAX_PIDS; ref_index++) {
+			if (device.items[i_index].references[ref_index].pid == 0) {
+				break;
+			}
+		}
+		if (ref_index < MAX_PIDS) {
+			device.items[i_index].references[ref_index].pid = lock_cmd->pid;
+			device.items[i_index].references[ref_index].ref_count = 0;
+		} else {
+			PERROR("whoops, item ran out of available reference slots\n");
+			return -EINVAL;
+
+		}
+	} else {
+		i_index = umplock_find_item(0);
+
+		if (i_index >= 0) {
+			device.items[i_index].secure_id = lock_item->secure_id;
+			device.items[i_index].id_ref_count = 0;
+			device.items[i_index].usage = lock_item->usage;
+			device.items[i_index].references[0].pid = lock_cmd->pid;
+			device.items[i_index].references[0].ref_count = 0;
+			sema_init(&device.items[i_index].item_lock, 1);
+		} else {
+			PERROR("whoops, ran out of available slots\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+/** IOCTLs **/
+
+static int do_umplock_create(_lock_cmd_priv *lock_cmd)
+{
+	return 0;
+}
+
+static int do_umplock_process(_lock_cmd_priv *lock_cmd)
+{
+	int ret, i_index, ref_index;
+	_lock_item_s *lock_item = (_lock_item_s *)&lock_cmd->msg;
+
+	mutex_lock(&device.item_list_lock);
+
+	if (0 == lock_item->secure_id) {
+		PERROR("IOCTL_UMPLOCK_PROCESS called with secure_id is 0, pid: %d\n", lock_cmd->pid);
+		mutex_unlock(&device.item_list_lock);
+		return -EINVAL;
+	}
+
+	ret = do_umplock_create_locked(lock_cmd);
+	if (ret < 0) {
+		mutex_unlock(&device.item_list_lock);
+		return -EINVAL;
+	}
+
+	ret = umplock_find_item_by_pid(lock_cmd, &i_index, &ref_index);
+	if (ret < 0) {
+		/*fail to find a item*/
+		PERROR("IOCTL_UMPLOCK_PROCESS called with invalid parameter, pid: %d\n", lock_cmd->pid);
+		mutex_unlock(&device.item_list_lock);
+		return -EINVAL;
+	}
+	device.items[i_index].references[ref_index].ref_count++;
+	device.items[i_index].id_ref_count++;
+	PDEBUG(1, "try to lock, pid: %d, secure_id: 0x%x, ref_count: %d\n", lock_cmd->pid, lock_item->secure_id, device.items[i_index].references[ref_index].ref_count);
+
+	if (lock_cmd->pid == device.items[i_index].owner) {
+		PDEBUG(1, "already own the lock, pid: %d, secure_id: 0x%x, ref_count: %d\n", lock_cmd->pid, lock_item->secure_id, device.items[i_index].references[ref_index].ref_count);
+		mutex_unlock(&device.item_list_lock);
+		return 0;
+	}
+
+	mutex_unlock(&device.item_list_lock);
+	if (down_interruptible(&device.items[i_index].item_lock)) {
+		/*wait up without hold the umplock. restore previous state and return*/
+		mutex_lock(&device.item_list_lock);
+		device.items[i_index].references[ref_index].ref_count--;
+		device.items[i_index].id_ref_count--;
+		if (0 == device.items[i_index].references[ref_index].ref_count) {
+			device.items[i_index].references[ref_index].pid = 0;
+			if (0 == device.items[i_index].id_ref_count) {
+				PDEBUG(1, "release item, pid: %d, secure_id: 0x%x\n", lock_cmd->pid, lock_item->secure_id);
+				device.items[i_index].secure_id = 0;
+			}
+		}
+
+		PERROR("failed lock, pid: %d, secure_id: 0x%x, ref_count: %d\n", lock_cmd->pid, lock_item->secure_id, device.items[i_index].references[ref_index].ref_count);
+
+		mutex_unlock(&device.item_list_lock);
+		return -ERESTARTSYS;
+	}
+
+	mutex_lock(&device.item_list_lock);
+	PDEBUG(1, "got lock, pid: %d, secure_id: 0x%x, ref_count: %d\n", lock_cmd->pid, lock_item->secure_id, device.items[i_index].references[ref_index].ref_count);
+	device.items[i_index].owner = lock_cmd->pid;
+	mutex_unlock(&device.item_list_lock);
+
+	return 0;
+}
+
+static int do_umplock_release(_lock_cmd_priv *lock_cmd)
+{
+	int ret, i_index, ref_index;
+	_lock_item_s *lock_item = (_lock_item_s *)&lock_cmd->msg;
+
+	mutex_lock(&device.item_list_lock);
+
+	if (0 == lock_item->secure_id) {
+		PERROR("IOCTL_UMPLOCK_RELEASE called with secure_id is 0, pid: %d\n", lock_cmd->pid);
+		mutex_unlock(&device.item_list_lock);
+		return -EINVAL;
+	}
+
+	ret = umplock_find_client_valid(lock_cmd->pid);
+	if (ret < 0) {
+		/*lock request from an invalid client pid, do nothing*/
+		mutex_unlock(&device.item_list_lock);
+		return -EPERM;
+	}
+
+	i_index = ref_index = -1;
+
+	ret = umplock_find_item_by_pid(lock_cmd, &i_index, &ref_index);
+	if (ret < 0) {
+		/*fail to find item*/
+		PERROR("IOCTL_UMPLOCK_RELEASE called with invalid parameter pid: %d, secid: 0x%x\n", lock_cmd->pid, lock_item->secure_id);
+		mutex_unlock(&device.item_list_lock);
+		return -EINVAL;
+	}
+
+	/* if the lock is not owned by this process */
+	if (lock_cmd->pid != device.items[i_index].owner) {
+		mutex_unlock(&device.item_list_lock);
+		return -EPERM;
+	}
+
+	/* if the ref_count is 0, that means nothing to unlock, just return */
+	if (0 == device.items[i_index].references[ref_index].ref_count) {
+		mutex_unlock(&device.item_list_lock);
+		return 0;
+	}
+
+	device.items[i_index].references[ref_index].ref_count--;
+	device.items[i_index].id_ref_count--;
+	PDEBUG(1, "unlock, pid: %d, secure_id: 0x%x, ref_count: %d\n", lock_cmd->pid, lock_item->secure_id, device.items[i_index].references[ref_index].ref_count);
+
+	if (0 == device.items[i_index].references[ref_index].ref_count) {
+		device.items[i_index].references[ref_index].pid = 0;
+		if (0 == device.items[i_index].id_ref_count) {
+			PDEBUG(1, "release item, pid: %d, secure_id: 0x%x\n", lock_cmd->pid, lock_item->secure_id);
+			device.items[i_index].secure_id = 0;
+		}
+		device.items[i_index].owner = 0;
+		up(&device.items[i_index].item_lock);
+	}
+	mutex_unlock(&device.item_list_lock);
+
+	return 0;
+}
+
+static int do_umplock_zap(void)
+{
+	int i;
+
+	PDEBUG(1, "ZAP ALL ENTRIES!\n");
+
+	mutex_lock(&device.item_list_lock);
+
+	for (i = 0; i < MAX_ITEMS; i++) {
+		device.items[i].secure_id = 0;
+		memset(&device.items[i].references, 0, sizeof(_lock_ref) * MAX_PIDS);
+		sema_init(&device.items[i].item_lock, 1);
+	}
+
+	for (i = 0; i < MAX_PIDS; i++) {
+		device.pids[i] = 0;
+	}
+	mutex_unlock(&device.item_list_lock);
+
+	return 0;
+}
+
+static int do_umplock_dump(void)
+{
+	int i, j;
+
+	mutex_lock(&device.item_list_lock);
+	PERROR("dump all the items begin\n");
+	for (i = 0; i < MAX_ITEMS; i++) {
+		for (j = 0; j < MAX_PIDS; j++) {
+			if (device.items[i].secure_id != 0 && device.items[i].references[j].pid != 0) {
+				PERROR("item[%d]->secure_id=0x%x, owner=%d\t reference[%d].ref_count=%d.pid=%d\n",
+				       i,
+				       device.items[i].secure_id,
+				       device.items[i].owner,
+				       j,
+				       device.items[i].references[j].ref_count,
+				       device.items[i].references[j].pid);
+			}
+		}
+	}
+	PERROR("dump all the items end\n");
+	mutex_unlock(&device.item_list_lock);
+
+	return 0;
+}
+
+int do_umplock_client_add(_lock_cmd_priv *lock_cmd)
+{
+	int i;
+	mutex_lock(&device.item_list_lock);
+	for (i = 0; i < MAX_PIDS; i++) {
+		if (device.pids[i] == lock_cmd->pid) {
+			mutex_unlock(&device.item_list_lock);
+			return 0;
+		}
+	}
+	for (i = 0; i < MAX_PIDS; i++) {
+		if (device.pids[i] == 0) {
+			device.pids[i] = lock_cmd->pid;
+			break;
+		}
+	}
+	mutex_unlock(&device.item_list_lock);
+	if (i == MAX_PIDS) {
+		PERROR("Oops, Run out of client slots\n ");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+int do_umplock_client_delete(_lock_cmd_priv *lock_cmd)
+{
+	int p_index = -1, i_index = -1, ref_index = -1;
+	int ret;
+	_lock_item_s *lock_item;
+	lock_item = (_lock_item_s *)&lock_cmd->msg;
+
+	mutex_lock(&device.item_list_lock);
+	p_index = umplock_find_client_valid(lock_cmd->pid);
+	/*lock item pid is not valid.*/
+	if (p_index < 0) {
+		mutex_unlock(&device.item_list_lock);
+		return 0;
+	}
+
+	/*walk through umplock item list and release reference attached to this client*/
+	for (i_index = 0; i_index < MAX_ITEMS; i_index++) {
+		lock_item->secure_id = device.items[i_index].secure_id;
+
+		/*find the item index and reference slot for the lock_item*/
+		ret = umplock_find_item_by_pid(lock_cmd, &i_index, &ref_index);
+
+		if (ret < 0) {
+			/*client has no reference on this umplock item, skip*/
+			continue;
+		}
+		while (device.items[i_index].references[ref_index].ref_count) {
+			/*release references on this client*/
+
+			PDEBUG(1, "delete client, pid: %d, ref_count: %d\n", lock_cmd->pid, device.items[i_index].references[ref_index].ref_count);
+
+			mutex_unlock(&device.item_list_lock);
+			do_umplock_release(lock_cmd);
+			mutex_lock(&device.item_list_lock);
+		}
+	}
+
+	/*remove the pid from umplock valid pid list*/
+	device.pids[p_index] = 0;
+	mutex_unlock(&device.item_list_lock);
+
+	return 0;
+}
+
+static long umplock_driver_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+	int ret;
+	uint32_t size = _IOC_SIZE(cmd);
+	_lock_cmd_priv lock_cmd ;
+
+	if (_IOC_TYPE(cmd) != LOCK_IOCTL_GROUP) {
+		return -ENOTTY;
+	}
+
+	if (_IOC_NR(cmd) >= LOCK_IOCTL_MAX_CMDS) {
+		return -ENOTTY;
+	}
+
+	switch (cmd) {
+	case LOCK_IOCTL_CREATE:
+		if (size != sizeof(_lock_item_s)) {
+			return -ENOTTY;
+		}
+
+		if (copy_from_user(&lock_cmd.msg, (void __user *)arg, size)) {
+			return -EFAULT;
+		}
+		lock_cmd.pid = (u32)current->tgid;
+		ret = do_umplock_create(&lock_cmd);
+		if (ret) {
+			return ret;
+		}
+		return 0;
+
+	case LOCK_IOCTL_PROCESS:
+		if (size != sizeof(_lock_item_s)) {
+			return -ENOTTY;
+		}
+
+		if (copy_from_user(&lock_cmd.msg, (void __user *)arg, size)) {
+			return -EFAULT;
+		}
+		lock_cmd.pid = (u32)current->tgid;
+		return do_umplock_process(&lock_cmd);
+
+	case LOCK_IOCTL_RELEASE:
+		if (size != sizeof(_lock_item_s)) {
+			return -ENOTTY;
+		}
+
+		if (copy_from_user(&lock_cmd.msg, (void __user *)arg, size)) {
+			return -EFAULT;
+		}
+		lock_cmd.pid = (u32)current->tgid;
+		ret = do_umplock_release(&lock_cmd);
+		if (ret) {
+			return ret;
+		}
+		return 0;
+
+	case LOCK_IOCTL_ZAP:
+		do_umplock_zap();
+		return 0;
+
+	case LOCK_IOCTL_DUMP:
+		do_umplock_dump();
+		return 0;
+	}
+
+	return -ENOIOCTLCMD;
+}
+
+static int umplock_driver_open(struct inode *inode, struct file *filp)
+{
+	_lock_cmd_priv lock_cmd;
+
+	atomic_inc(&device.sessions);
+	PDEBUG(1, "OPEN SESSION (%i references)\n", atomic_read(&device.sessions));
+
+	lock_cmd.pid = (u32)current->tgid;
+	do_umplock_client_add(&lock_cmd);
+
+	return 0;
+}
+
+static int umplock_driver_release(struct inode *inode, struct file *filp)
+{
+	int sessions = 0;
+	_lock_cmd_priv lock_cmd;
+
+	lock_cmd.pid = (u32)current->tgid;
+	do_umplock_client_delete(&lock_cmd);
+
+	mutex_lock(&device.item_list_lock);
+	atomic_dec(&device.sessions);
+	sessions = atomic_read(&device.sessions);
+	PDEBUG(1, "CLOSE SESSION (%i references)\n", sessions);
+	mutex_unlock(&device.item_list_lock);
+	if (sessions == 0) {
+		do_umplock_zap();
+	}
+
+	return 0;
+}
+
+static struct file_operations umplock_fops = {
+	.owner   = THIS_MODULE,
+	.open    = umplock_driver_open,
+	.release = umplock_driver_release,
+	.unlocked_ioctl = umplock_driver_ioctl,
+};
+
+int umplock_device_initialize(void)
+{
+	int err;
+
+	err = alloc_chrdev_region(&umplock_dev, 0, 1, umplock_dev_name);
+
+	if (0 == err) {
+		memset(&umplock_device, 0, sizeof(umplock_device));
+		cdev_init(&umplock_device.cdev, &umplock_fops);
+		umplock_device.cdev.owner = THIS_MODULE;
+		umplock_device.cdev.ops = &umplock_fops;
+
+		err = cdev_add(&umplock_device.cdev, umplock_dev, 1);
+		if (0 == err) {
+			umplock_device.umplock_class = class_create(THIS_MODULE, umplock_dev_name);
+			if (IS_ERR(umplock_device.umplock_class)) {
+				err = PTR_ERR(umplock_device.umplock_class);
+			} else {
+				struct device *mdev;
+				mdev = device_create(umplock_device.umplock_class, NULL, umplock_dev, NULL, umplock_dev_name);
+				if (!IS_ERR(mdev)) {
+					return 0; /* all ok */
+				}
+
+				err = PTR_ERR(mdev);
+				class_destroy(umplock_device.umplock_class);
+			}
+			cdev_del(&umplock_device.cdev);
+		}
+
+		unregister_chrdev_region(umplock_dev, 1);
+	} else {
+		PERROR("alloc chardev region failed\n");
+	}
+
+	return err;
+}
+
+void umplock_device_terminate(void)
+{
+	device_destroy(umplock_device.umplock_class, umplock_dev);
+	class_destroy(umplock_device.umplock_class);
+
+	cdev_del(&umplock_device.cdev);
+	unregister_chrdev_region(umplock_dev, 1);
+}
+
+static int __init umplock_initialize_module(void)
+{
+	PDEBUG(1, "Inserting UMP lock device driver. Compiled: %s, time: %s\n", __DATE__, __TIME__);
+
+	mutex_init(&device.item_list_lock);
+	if (umplock_device_initialize() != 0) {
+		PERROR("UMP lock device driver init failed\n");
+		return -ENOTTY;
+	}
+	memset(&device.items, 0, sizeof(umplock_item) * MAX_ITEMS);
+	memset(&device.pids, 0, sizeof(u32) * MAX_PIDS);
+	atomic_set(&device.sessions, 0);
+
+	PDEBUG(1, "UMP lock device driver loaded\n");
+
+	return 0;
+}
+
+static void __exit umplock_cleanup_module(void)
+{
+	PDEBUG(1, "unloading UMP lock module\n");
+
+	memset(&device.items, 0, sizeof(umplock_item) * MAX_ITEMS);
+	memset(&device.pids, 0, sizeof(u32) * MAX_PIDS);
+	umplock_device_terminate();
+	mutex_destroy(&device.item_list_lock);
+
+	PDEBUG(1, "UMP lock module unloaded\n");
+}
+
+module_init(umplock_initialize_module);
+module_exit(umplock_cleanup_module);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("ARM Ltd.");
+MODULE_DESCRIPTION("ARM UMP locker");