mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
[POWERPC] PS3: Use the HVs storage device notification mechanism properly
The PS3 hypervisor has a storage device notification mechanism to wait
until a storage device is ready. Unfortunately the storage device
probing code used this mechanism in an incorrect way, needing a
polling loop and handling of devices that are not yet ready.
This change corrects this by:
- First waiting for the reception of an asynchronous notification
that a new storage device became ready,
- Then looking up the storage device in the device repository.
On shutdown, the storage probe thread is stopped and the storage
notification device is closed using a reboot notifier.
Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Geert Uytterhoeven
Paul Mackerras
parent
e06bcf3cc3
commit
b4cb2941f8
3 changed files with 222 additions and 233 deletions
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@ -23,6 +23,7 @@
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/init.h>
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#include <linux/reboot.h>
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#include <asm/firmware.h>
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#include <asm/lv1call.h>
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@ -238,166 +239,6 @@ static int __init ps3_setup_vuart_device(enum ps3_match_id match_id,
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return result;
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}
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static int ps3stor_wait_for_completion(u64 dev_id, u64 tag,
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unsigned int timeout)
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{
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int result = -1;
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unsigned int retries = 0;
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u64 status;
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for (retries = 0; retries < timeout; retries++) {
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result = lv1_storage_check_async_status(dev_id, tag, &status);
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if (!result)
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break;
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msleep(1);
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}
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if (result)
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pr_debug("%s:%u: check_async_status: %s, status %lx\n",
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__func__, __LINE__, ps3_result(result), status);
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return result;
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}
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/**
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* ps3_storage_wait_for_device - Wait for a storage device to become ready.
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* @repo: The repository device to wait for.
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*
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* Uses the hypervisor's storage device notification mechanism to wait until
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* a storage device is ready. The device notification mechanism uses a
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* psuedo device (id = -1) to asynchronously notify the guest when storage
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* devices become ready. The notification device has a block size of 512
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* bytes.
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*/
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static int ps3_storage_wait_for_device(const struct ps3_repository_device *repo)
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{
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int error = -ENODEV;
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int result;
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const u64 notification_dev_id = (u64)-1LL;
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const unsigned int timeout = HZ;
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u64 lpar;
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u64 tag;
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void *buf;
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enum ps3_notify_type {
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notify_device_ready = 0,
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notify_region_probe = 1,
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notify_region_update = 2,
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};
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struct {
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u64 operation_code; /* must be zero */
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u64 event_mask; /* OR of 1UL << enum ps3_notify_type */
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} *notify_cmd;
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struct {
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u64 event_type; /* enum ps3_notify_type */
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u64 bus_id;
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u64 dev_id;
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u64 dev_type;
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u64 dev_port;
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} *notify_event;
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pr_debug(" -> %s:%u: (%lu:%lu:%u)\n", __func__, __LINE__, repo->bus_id,
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repo->dev_id, repo->dev_type);
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buf = kzalloc(512, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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lpar = ps3_mm_phys_to_lpar(__pa(buf));
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notify_cmd = buf;
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notify_event = buf;
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result = lv1_open_device(repo->bus_id, notification_dev_id, 0);
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if (result) {
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printk(KERN_ERR "%s:%u: lv1_open_device %s\n", __func__,
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__LINE__, ps3_result(result));
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goto fail_free;
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}
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/* Setup and write the request for device notification. */
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notify_cmd->operation_code = 0; /* must be zero */
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notify_cmd->event_mask = 1UL << notify_region_probe;
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result = lv1_storage_write(notification_dev_id, 0, 0, 1, 0, lpar,
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&tag);
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if (result) {
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printk(KERN_ERR "%s:%u: write failed %s\n", __func__, __LINE__,
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ps3_result(result));
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goto fail_close;
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}
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/* Wait for the write completion */
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result = ps3stor_wait_for_completion(notification_dev_id, tag,
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timeout);
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if (result) {
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printk(KERN_ERR "%s:%u: write not completed %s\n", __func__,
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__LINE__, ps3_result(result));
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goto fail_close;
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}
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/* Loop here processing the requested notification events. */
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while (1) {
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memset(notify_event, 0, sizeof(*notify_event));
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result = lv1_storage_read(notification_dev_id, 0, 0, 1, 0,
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lpar, &tag);
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if (result) {
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printk(KERN_ERR "%s:%u: write failed %s\n", __func__,
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__LINE__, ps3_result(result));
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break;
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}
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result = ps3stor_wait_for_completion(notification_dev_id, tag,
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timeout);
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if (result) {
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printk(KERN_ERR "%s:%u: read not completed %s\n",
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__func__, __LINE__, ps3_result(result));
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break;
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}
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pr_debug("%s:%d: notify event (%u:%u:%u): event_type 0x%lx, "
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"port %lu\n", __func__, __LINE__, repo->bus_index,
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repo->dev_index, repo->dev_type,
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notify_event->event_type, notify_event->dev_port);
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if (notify_event->event_type != notify_region_probe ||
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notify_event->bus_id != repo->bus_id) {
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pr_debug("%s:%u: bad notify_event: event %lu, "
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"dev_id %lu, dev_type %lu\n",
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__func__, __LINE__, notify_event->event_type,
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notify_event->dev_id, notify_event->dev_type);
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break;
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}
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if (notify_event->dev_id == repo->dev_id &&
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notify_event->dev_type == repo->dev_type) {
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pr_debug("%s:%u: device ready (%u:%u:%u)\n", __func__,
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__LINE__, repo->bus_index, repo->dev_index,
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repo->dev_type);
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error = 0;
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break;
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}
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if (notify_event->dev_id == repo->dev_id &&
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notify_event->dev_type == PS3_DEV_TYPE_NOACCESS) {
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pr_debug("%s:%u: no access: dev_id %lu\n", __func__,
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__LINE__, repo->dev_id);
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break;
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}
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}
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fail_close:
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lv1_close_device(repo->bus_id, notification_dev_id);
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fail_free:
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kfree(buf);
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pr_debug(" <- %s:%u\n", __func__, __LINE__);
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return error;
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}
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static int ps3_setup_storage_dev(const struct ps3_repository_device *repo,
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enum ps3_match_id match_id)
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{
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@ -449,16 +290,6 @@ static int ps3_setup_storage_dev(const struct ps3_repository_device *repo,
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goto fail_find_interrupt;
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}
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/* FIXME: Arrange to only do this on a 'cold' boot */
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result = ps3_storage_wait_for_device(repo);
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if (result) {
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printk(KERN_ERR "%s:%u: storage_notification failed %d\n",
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__func__, __LINE__, result);
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result = -ENODEV;
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goto fail_probe_notification;
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}
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for (i = 0; i < num_regions; i++) {
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unsigned int id;
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u64 start, size;
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@ -494,7 +325,6 @@ static int ps3_setup_storage_dev(const struct ps3_repository_device *repo,
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fail_device_register:
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fail_read_region:
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fail_probe_notification:
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fail_find_interrupt:
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kfree(p);
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fail_malloc:
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@ -659,61 +489,247 @@ static int ps3_register_repository_device(
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return result;
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}
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#define PS3_NOTIFICATION_DEV_ID ULONG_MAX
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#define PS3_NOTIFICATION_INTERRUPT_ID 0
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struct ps3_notification_device {
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struct ps3_system_bus_device sbd;
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spinlock_t lock;
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u64 tag;
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u64 lv1_status;
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struct completion done;
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};
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enum ps3_notify_type {
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notify_device_ready = 0,
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notify_region_probe = 1,
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notify_region_update = 2,
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};
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struct ps3_notify_cmd {
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u64 operation_code; /* must be zero */
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u64 event_mask; /* OR of 1UL << enum ps3_notify_type */
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};
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struct ps3_notify_event {
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u64 event_type; /* enum ps3_notify_type */
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u64 bus_id;
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u64 dev_id;
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u64 dev_type;
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u64 dev_port;
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};
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static irqreturn_t ps3_notification_interrupt(int irq, void *data)
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{
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struct ps3_notification_device *dev = data;
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int res;
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u64 tag, status;
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spin_lock(&dev->lock);
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res = lv1_storage_get_async_status(PS3_NOTIFICATION_DEV_ID, &tag,
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&status);
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if (tag != dev->tag)
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pr_err("%s:%u: tag mismatch, got %lx, expected %lx\n",
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__func__, __LINE__, tag, dev->tag);
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if (res) {
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pr_err("%s:%u: res %d status 0x%lx\n", __func__, __LINE__, res,
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status);
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} else {
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pr_debug("%s:%u: completed, status 0x%lx\n", __func__,
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__LINE__, status);
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dev->lv1_status = status;
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complete(&dev->done);
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}
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spin_unlock(&dev->lock);
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return IRQ_HANDLED;
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}
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static int ps3_notification_read_write(struct ps3_notification_device *dev,
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u64 lpar, int write)
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{
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const char *op = write ? "write" : "read";
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unsigned long flags;
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int res;
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init_completion(&dev->done);
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spin_lock_irqsave(&dev->lock, flags);
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res = write ? lv1_storage_write(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
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&dev->tag)
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: lv1_storage_read(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
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&dev->tag);
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spin_unlock_irqrestore(&dev->lock, flags);
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if (res) {
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pr_err("%s:%u: %s failed %d\n", __func__, __LINE__, op, res);
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return -EPERM;
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}
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pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op);
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res = wait_event_interruptible(dev->done.wait,
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dev->done.done || kthread_should_stop());
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if (kthread_should_stop())
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res = -EINTR;
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if (res) {
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pr_debug("%s:%u: interrupted %s\n", __func__, __LINE__, op);
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return res;
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}
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if (dev->lv1_status) {
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pr_err("%s:%u: %s not completed, status 0x%lx\n", __func__,
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__LINE__, op, dev->lv1_status);
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return -EIO;
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}
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pr_debug("%s:%u: notification %s completed\n", __func__, __LINE__, op);
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return 0;
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}
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static struct task_struct *probe_task;
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/**
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* ps3_probe_thread - Background repository probing at system startup.
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*
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* This implementation only supports background probing on a single bus.
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* It uses the hypervisor's storage device notification mechanism to wait until
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* a storage device is ready. The device notification mechanism uses a
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* pseudo device to asynchronously notify the guest when storage devices become
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* ready. The notification device has a block size of 512 bytes.
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*/
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static int ps3_probe_thread(void *data)
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{
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struct ps3_repository_device *repo = data;
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int result;
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unsigned int ms = 250;
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struct ps3_notification_device dev;
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struct ps3_repository_device repo;
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int res;
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unsigned int irq;
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u64 lpar;
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void *buf;
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struct ps3_notify_cmd *notify_cmd;
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struct ps3_notify_event *notify_event;
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pr_debug(" -> %s:%u: kthread started\n", __func__, __LINE__);
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buf = kzalloc(512, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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lpar = ps3_mm_phys_to_lpar(__pa(buf));
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notify_cmd = buf;
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notify_event = buf;
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/* dummy system bus device */
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dev.sbd.bus_id = (u64)data;
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dev.sbd.dev_id = PS3_NOTIFICATION_DEV_ID;
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dev.sbd.interrupt_id = PS3_NOTIFICATION_INTERRUPT_ID;
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res = lv1_open_device(dev.sbd.bus_id, dev.sbd.dev_id, 0);
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if (res) {
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pr_err("%s:%u: lv1_open_device failed %s\n", __func__,
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__LINE__, ps3_result(res));
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goto fail_free;
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}
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res = ps3_sb_event_receive_port_setup(&dev.sbd, PS3_BINDING_CPU_ANY,
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&irq);
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if (res) {
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pr_err("%s:%u: ps3_sb_event_receive_port_setup failed %d\n",
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__func__, __LINE__, res);
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goto fail_close_device;
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}
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spin_lock_init(&dev.lock);
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res = request_irq(irq, ps3_notification_interrupt, IRQF_DISABLED,
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"ps3_notification", &dev);
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if (res) {
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pr_err("%s:%u: request_irq failed %d\n", __func__, __LINE__,
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res);
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goto fail_sb_event_receive_port_destroy;
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}
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/* Setup and write the request for device notification. */
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notify_cmd->operation_code = 0; /* must be zero */
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notify_cmd->event_mask = 1UL << notify_region_probe;
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res = ps3_notification_read_write(&dev, lpar, 1);
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if (res)
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goto fail_free_irq;
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/* Loop here processing the requested notification events. */
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do {
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try_to_freeze();
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pr_debug("%s:%u: probing...\n", __func__, __LINE__);
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memset(notify_event, 0, sizeof(*notify_event));
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do {
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result = ps3_repository_find_device(repo);
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if (result == -ENODEV)
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pr_debug("%s:%u: nothing new\n", __func__,
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__LINE__);
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else if (result)
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pr_debug("%s:%u: find device error.\n",
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__func__, __LINE__);
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else {
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pr_debug("%s:%u: found device (%u:%u:%u)\n",
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__func__, __LINE__, repo->bus_index,
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repo->dev_index, repo->dev_type);
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ps3_register_repository_device(repo);
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ps3_repository_bump_device(repo);
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ms = 250;
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}
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} while (!result);
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pr_debug("%s:%u: ms %u\n", __func__, __LINE__, ms);
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if ( ms > 60000)
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res = ps3_notification_read_write(&dev, lpar, 0);
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if (res)
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break;
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msleep_interruptible(ms);
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pr_debug("%s:%u: notify event type 0x%lx bus id %lu dev id %lu"
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" type %lu port %lu\n", __func__, __LINE__,
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notify_event->event_type, notify_event->bus_id,
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notify_event->dev_id, notify_event->dev_type,
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notify_event->dev_port);
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/* An exponential backoff. */
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ms <<= 1;
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if (notify_event->event_type != notify_region_probe ||
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notify_event->bus_id != dev.sbd.bus_id) {
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pr_warning("%s:%u: bad notify_event: event %lu, "
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"dev_id %lu, dev_type %lu\n",
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__func__, __LINE__, notify_event->event_type,
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notify_event->dev_id,
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notify_event->dev_type);
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continue;
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}
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res = ps3_repository_find_device_by_id(&repo, dev.sbd.bus_id,
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notify_event->dev_id);
|
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if (res) {
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pr_warning("%s:%u: device %lu:%lu not found\n",
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__func__, __LINE__, dev.sbd.bus_id,
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notify_event->dev_id);
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continue;
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}
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pr_debug("%s:%u: device %lu:%lu found\n", __func__, __LINE__,
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dev.sbd.bus_id, notify_event->dev_id);
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ps3_register_repository_device(&repo);
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} while (!kthread_should_stop());
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fail_free_irq:
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free_irq(irq, &dev);
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fail_sb_event_receive_port_destroy:
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ps3_sb_event_receive_port_destroy(&dev.sbd, irq);
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fail_close_device:
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lv1_close_device(dev.sbd.bus_id, dev.sbd.dev_id);
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fail_free:
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kfree(buf);
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|
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probe_task = NULL;
|
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|
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pr_debug(" <- %s:%u: kthread finished\n", __func__, __LINE__);
|
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|
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return 0;
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}
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|
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/**
|
||||
* ps3_stop_probe_thread - Stops the background probe thread.
|
||||
*
|
||||
*/
|
||||
|
||||
static int ps3_stop_probe_thread(struct notifier_block *nb, unsigned long code,
|
||||
void *data)
|
||||
{
|
||||
if (probe_task)
|
||||
kthread_stop(probe_task);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct notifier_block nb = {
|
||||
.notifier_call = ps3_stop_probe_thread
|
||||
};
|
||||
|
||||
/**
|
||||
* ps3_start_probe_thread - Starts the background probe thread.
|
||||
*
|
||||
|
|
@ -723,7 +739,7 @@ static int __init ps3_start_probe_thread(enum ps3_bus_type bus_type)
|
|||
{
|
||||
int result;
|
||||
struct task_struct *task;
|
||||
static struct ps3_repository_device repo; /* must be static */
|
||||
struct ps3_repository_device repo;
|
||||
|
||||
pr_debug(" -> %s:%d\n", __func__, __LINE__);
|
||||
|
||||
|
|
@ -746,7 +762,8 @@ static int __init ps3_start_probe_thread(enum ps3_bus_type bus_type)
|
|||
return -ENODEV;
|
||||
}
|
||||
|
||||
task = kthread_run(ps3_probe_thread, &repo, "ps3-probe-%u", bus_type);
|
||||
task = kthread_run(ps3_probe_thread, (void *)repo.bus_id,
|
||||
"ps3-probe-%u", bus_type);
|
||||
|
||||
if (IS_ERR(task)) {
|
||||
result = PTR_ERR(task);
|
||||
|
|
@ -755,6 +772,9 @@ static int __init ps3_start_probe_thread(enum ps3_bus_type bus_type)
|
|||
return result;
|
||||
}
|
||||
|
||||
probe_task = task;
|
||||
register_reboot_notifier(&nb);
|
||||
|
||||
pr_debug(" <- %s:%d\n", __func__, __LINE__);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -89,8 +89,6 @@ enum ps3_dev_type {
|
|||
PS3_DEV_TYPE_STOR_ROM = TYPE_ROM, /* 5 */
|
||||
PS3_DEV_TYPE_SB_GPIO = 6,
|
||||
PS3_DEV_TYPE_STOR_FLASH = TYPE_RBC, /* 14 */
|
||||
PS3_DEV_TYPE_STOR_DUMMY = 32,
|
||||
PS3_DEV_TYPE_NOACCESS = 255,
|
||||
};
|
||||
|
||||
int ps3_repository_read_bus_str(unsigned int bus_index, const char *bus_str,
|
||||
|
|
|
|||
|
|
@ -344,35 +344,6 @@ int ps3_repository_find_device(struct ps3_repository_device *repo)
|
|||
return result;
|
||||
}
|
||||
|
||||
if (tmp.bus_type == PS3_BUS_TYPE_STORAGE) {
|
||||
/*
|
||||
* A storage device may show up in the repository before the
|
||||
* hypervisor has finished probing its type and regions
|
||||
*/
|
||||
unsigned int num_regions;
|
||||
|
||||
if (tmp.dev_type == PS3_DEV_TYPE_STOR_DUMMY) {
|
||||
pr_debug("%s:%u storage device not ready\n", __func__,
|
||||
__LINE__);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
result = ps3_repository_read_stor_dev_num_regions(tmp.bus_index,
|
||||
tmp.dev_index,
|
||||
&num_regions);
|
||||
if (result) {
|
||||
pr_debug("%s:%d read_stor_dev_num_regions failed\n",
|
||||
__func__, __LINE__);
|
||||
return result;
|
||||
}
|
||||
|
||||
if (!num_regions) {
|
||||
pr_debug("%s:%u storage device has no regions yet\n",
|
||||
__func__, __LINE__);
|
||||
return -ENODEV;
|
||||
}
|
||||
}
|
||||
|
||||
result = ps3_repository_read_dev_id(tmp.bus_index, tmp.dev_index,
|
||||
&tmp.dev_id);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue