ps3: Replace direct file operations by callback
Currently the FLASH database is updated by the kernel using file operations,
meant for userspace only. While this works for us because copy_{from,to}_user()
on powerpc can handle kernel pointers, this is unportable and a bad example.
Replace the file operations by callbacks, registered by the ps3flash driver.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Geert Uytterhoeven
Benjamin Herrenschmidt
parent
47cb996b05
commit
a4e623fbc9
@ -53,6 +53,13 @@ enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void);
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extern u64 ps3_os_area_get_rtc_diff(void);
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extern void ps3_os_area_set_rtc_diff(u64 rtc_diff);
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struct ps3_os_area_flash_ops {
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ssize_t (*read)(void *buf, size_t count, loff_t pos);
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ssize_t (*write)(const void *buf, size_t count, loff_t pos);
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};
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extern void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops);
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/* dma routines */
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enum ps3_dma_page_size {
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@ -226,6 +226,44 @@ static struct property property_av_multi_out = {
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.value = &saved_params.av_multi_out,
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};
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static DEFINE_MUTEX(os_area_flash_mutex);
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static const struct ps3_os_area_flash_ops *os_area_flash_ops;
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void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops)
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{
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mutex_lock(&os_area_flash_mutex);
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os_area_flash_ops = ops;
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mutex_unlock(&os_area_flash_mutex);
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}
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EXPORT_SYMBOL_GPL(ps3_os_area_flash_register);
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static ssize_t os_area_flash_read(void *buf, size_t count, loff_t pos)
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{
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ssize_t res = -ENODEV;
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mutex_lock(&os_area_flash_mutex);
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if (os_area_flash_ops)
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res = os_area_flash_ops->read(buf, count, pos);
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mutex_unlock(&os_area_flash_mutex);
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return res;
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}
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static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos)
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{
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ssize_t res = -ENODEV;
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mutex_lock(&os_area_flash_mutex);
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if (os_area_flash_ops)
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res = os_area_flash_ops->write(buf, count, pos);
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mutex_unlock(&os_area_flash_mutex);
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return res;
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}
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/**
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* os_area_set_property - Add or overwrite a saved_params value to the device tree.
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*
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@ -352,12 +390,12 @@ static int db_verify(const struct os_area_db *db)
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if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM,
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sizeof(db->magic_num))) {
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pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
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return -1;
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return -EINVAL;
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}
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if (db->version != 1) {
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pr_debug("%s:%d version failed\n", __func__, __LINE__);
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return -1;
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return -EINVAL;
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}
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return 0;
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@ -578,59 +616,48 @@ static void os_area_db_init(struct os_area_db *db)
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*
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*/
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static void __maybe_unused update_flash_db(void)
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static int update_flash_db(void)
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{
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int result;
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int file;
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off_t offset;
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const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE;
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struct os_area_header *header;
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ssize_t count;
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static const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE;
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const struct os_area_header *header;
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int error;
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loff_t pos;
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struct os_area_db* db;
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/* Read in header and db from flash. */
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file = sys_open("/dev/ps3flash", O_RDWR, 0);
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if (file < 0) {
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pr_debug("%s:%d sys_open failed\n", __func__, __LINE__);
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goto fail_open;
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}
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header = kmalloc(buf_len, GFP_KERNEL);
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if (!header) {
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pr_debug("%s:%d kmalloc failed\n", __func__, __LINE__);
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goto fail_malloc;
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pr_debug("%s: kmalloc failed\n", __func__);
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return -ENOMEM;
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}
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offset = sys_lseek(file, 0, SEEK_SET);
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if (offset != 0) {
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pr_debug("%s:%d sys_lseek failed\n", __func__, __LINE__);
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goto fail_header_seek;
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count = os_area_flash_read(header, buf_len, 0);
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if (count < 0) {
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pr_debug("%s: os_area_flash_read failed %zd\n", __func__,
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count);
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error = count;
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goto fail;
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}
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count = sys_read(file, (char __user *)header, buf_len);
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result = count < OS_AREA_SEGMENT_SIZE || verify_header(header)
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|| count < header->db_area_offset * OS_AREA_SEGMENT_SIZE;
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if (result) {
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pr_debug("%s:%d verify_header failed\n", __func__, __LINE__);
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pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE;
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if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) ||
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count < pos) {
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pr_debug("%s: verify_header failed\n", __func__);
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dump_header(header);
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goto fail_header;
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error = -EINVAL;
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goto fail;
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}
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/* Now got a good db offset and some maybe good db data. */
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db = (void*)header + header->db_area_offset * OS_AREA_SEGMENT_SIZE;
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db = (void *)header + pos;
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result = db_verify(db);
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if (result) {
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printk(KERN_NOTICE "%s:%d: Verify of flash database failed, "
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"formatting.\n", __func__, __LINE__);
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error = db_verify(db);
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if (error) {
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pr_notice("%s: Verify of flash database failed, formatting.\n",
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__func__);
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dump_db(db);
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os_area_db_init(db);
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}
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@ -639,29 +666,16 @@ static void __maybe_unused update_flash_db(void)
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db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff);
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offset = sys_lseek(file, header->db_area_offset * OS_AREA_SEGMENT_SIZE,
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SEEK_SET);
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if (offset != header->db_area_offset * OS_AREA_SEGMENT_SIZE) {
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pr_debug("%s:%d sys_lseek failed\n", __func__, __LINE__);
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goto fail_db_seek;
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}
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count = sys_write(file, (const char __user *)db,
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sizeof(struct os_area_db));
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count = os_area_flash_write(db, sizeof(struct os_area_db), pos);
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if (count < sizeof(struct os_area_db)) {
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pr_debug("%s:%d sys_write failed\n", __func__, __LINE__);
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pr_debug("%s: os_area_flash_write failed %zd\n", __func__,
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count);
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error = count < 0 ? count : -EIO;
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}
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fail_db_seek:
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fail_header:
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fail_header_seek:
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fail:
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kfree(header);
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fail_malloc:
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sys_close(file);
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fail_open:
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return;
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return error;
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}
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/**
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@ -674,11 +688,11 @@ fail_open:
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static void os_area_queue_work_handler(struct work_struct *work)
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{
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struct device_node *node;
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int error;
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pr_debug(" -> %s:%d\n", __func__, __LINE__);
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node = of_find_node_by_path("/");
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if (node) {
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os_area_set_property(node, &property_rtc_diff);
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of_node_put(node);
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@ -686,12 +700,10 @@ static void os_area_queue_work_handler(struct work_struct *work)
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pr_debug("%s:%d of_find_node_by_path failed\n",
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__func__, __LINE__);
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#if defined(CONFIG_PS3_FLASH) || defined(CONFIG_PS3_FLASH_MODULE)
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update_flash_db();
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#else
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printk(KERN_WARNING "%s:%d: No flash rom driver configured.\n",
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__func__, __LINE__);
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#endif
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error = update_flash_db();
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if (error)
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pr_warning("%s: Could not update FLASH ROM\n", __func__);
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pr_debug(" <- %s:%d\n", __func__, __LINE__);
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}
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@ -104,18 +104,19 @@ out:
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return res;
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}
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static ssize_t ps3flash_read(struct file *file, char __user *buf, size_t count,
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loff_t *pos)
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static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf,
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size_t count, loff_t *pos)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
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u64 size, start_sector, end_sector, offset;
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ssize_t sectors_read;
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size_t remaining, n;
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const void *src;
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dev_dbg(&dev->sbd.core,
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"%s:%u: Reading %zu bytes at position %lld to user 0x%p\n",
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__func__, __LINE__, count, *pos, buf);
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"%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
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__func__, __LINE__, count, *pos, userbuf, kernelbuf);
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size = dev->regions[dev->region_idx].size*dev->blk_size;
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if (*pos >= size || !count)
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@ -145,19 +146,26 @@ static ssize_t ps3flash_read(struct file *file, char __user *buf, size_t count,
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}
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n = min_t(u64, remaining, sectors_read*dev->blk_size-offset);
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src = dev->bounce_buf+offset;
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dev_dbg(&dev->sbd.core,
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"%s:%u: copy %lu bytes from 0x%p to user 0x%p\n",
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__func__, __LINE__, n, dev->bounce_buf+offset, buf);
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if (copy_to_user(buf, dev->bounce_buf+offset, n)) {
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mutex_unlock(&priv->mutex);
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sectors_read = -EFAULT;
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goto fail;
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"%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n",
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__func__, __LINE__, n, src, userbuf, kernelbuf);
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if (userbuf) {
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if (copy_to_user(userbuf, src, n)) {
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mutex_unlock(&priv->mutex);
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sectors_read = -EFAULT;
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goto fail;
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}
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userbuf += n;
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}
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if (kernelbuf) {
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memcpy(kernelbuf, src, n);
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kernelbuf += n;
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}
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mutex_unlock(&priv->mutex);
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*pos += n;
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buf += n;
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remaining -= n;
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start_sector += sectors_read;
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offset = 0;
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@ -169,8 +177,8 @@ fail:
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return sectors_read;
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}
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static ssize_t ps3flash_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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static ssize_t ps3flash_write(const char __user *userbuf,
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const void *kernelbuf, size_t count, loff_t *pos)
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{
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struct ps3_storage_device *dev = ps3flash_dev;
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struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
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@ -179,10 +187,11 @@ static ssize_t ps3flash_write(struct file *file, const char __user *buf,
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ssize_t res;
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size_t remaining, n;
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unsigned int sec_off;
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void *dst;
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dev_dbg(&dev->sbd.core,
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"%s:%u: Writing %zu bytes at position %lld from user 0x%p\n",
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__func__, __LINE__, count, *pos, buf);
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"%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
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__func__, __LINE__, count, *pos, userbuf, kernelbuf);
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size = dev->regions[dev->region_idx].size*dev->blk_size;
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if (*pos >= size || !count)
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@ -259,12 +268,20 @@ static ssize_t ps3flash_write(struct file *file, const char __user *buf,
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}
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n = min_t(u64, remaining, dev->bounce_size-offset);
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dst = dev->bounce_buf+offset;
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dev_dbg(&dev->sbd.core,
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"%s:%u: copy %lu bytes from user 0x%p to 0x%p\n",
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__func__, __LINE__, n, buf, dev->bounce_buf+offset);
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if (copy_from_user(dev->bounce_buf+offset, buf, n)) {
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res = -EFAULT;
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goto fail;
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"%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n",
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__func__, __LINE__, n, userbuf, kernelbuf, dst);
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if (userbuf) {
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if (copy_from_user(dst, userbuf, n)) {
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res = -EFAULT;
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goto fail;
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}
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userbuf += n;
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}
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if (kernelbuf) {
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memcpy(dst, kernelbuf, n);
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kernelbuf += n;
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}
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res = ps3flash_write_chunk(dev, start_write_sector);
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@ -274,7 +291,6 @@ static ssize_t ps3flash_write(struct file *file, const char __user *buf,
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mutex_unlock(&priv->mutex);
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*pos += n;
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buf += n;
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remaining -= n;
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start_write_sector += chunk_sectors;
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head = 0;
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@ -288,6 +304,29 @@ fail:
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return res;
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}
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static ssize_t ps3flash_user_read(struct file *file, char __user *buf,
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size_t count, loff_t *pos)
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{
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return ps3flash_read(buf, NULL, count, pos);
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}
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static ssize_t ps3flash_user_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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{
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return ps3flash_write(buf, NULL, count, pos);
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}
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static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos)
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{
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return ps3flash_read(NULL, buf, count, &pos);
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}
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static ssize_t ps3flash_kernel_write(const void *buf, size_t count,
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loff_t pos)
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{
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return ps3flash_write(NULL, buf, count, &pos);
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}
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static irqreturn_t ps3flash_interrupt(int irq, void *data)
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{
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@ -312,12 +351,16 @@ static irqreturn_t ps3flash_interrupt(int irq, void *data)
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return IRQ_HANDLED;
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}
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static const struct file_operations ps3flash_fops = {
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.owner = THIS_MODULE,
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.llseek = ps3flash_llseek,
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.read = ps3flash_read,
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.write = ps3flash_write,
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.read = ps3flash_user_read,
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.write = ps3flash_user_write,
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};
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static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = {
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.read = ps3flash_kernel_read,
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.write = ps3flash_kernel_write,
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};
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static struct miscdevice ps3flash_misc = {
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@ -386,6 +429,8 @@ static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
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dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
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__func__, __LINE__, ps3flash_misc.minor);
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ps3_os_area_flash_register(&ps3flash_kernel_ops);
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return 0;
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fail_teardown:
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@ -402,6 +447,7 @@ static int ps3flash_remove(struct ps3_system_bus_device *_dev)
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{
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struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
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ps3_os_area_flash_register(NULL);
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misc_deregister(&ps3flash_misc);
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ps3stor_teardown(dev);
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kfree(ps3_system_bus_get_drvdata(&dev->sbd));
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