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path: root/drivers/firewire/fw-cdev.c
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Diffstat (limited to 'drivers/firewire/fw-cdev.c')
-rw-r--r--drivers/firewire/fw-cdev.c215
1 files changed, 214 insertions, 1 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 4c33b51b735..a227853aa1e 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -24,6 +24,7 @@
#include <linux/errno.h>
#include <linux/firewire-cdev.h>
#include <linux/idr.h>
+#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/mm.h>
@@ -35,6 +36,7 @@
#include <linux/time.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
+#include <linux/workqueue.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@@ -114,6 +116,21 @@ struct descriptor_resource {
u32 data[0];
};
+struct iso_resource {
+ struct client_resource resource;
+ struct client *client;
+ /* Schedule work and access todo only with client->lock held. */
+ struct delayed_work work;
+ enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,} todo;
+ int generation;
+ u64 channels;
+ s32 bandwidth;
+ struct iso_resource_event *e_alloc, *e_dealloc;
+};
+
+static void schedule_iso_resource(struct iso_resource *);
+static void release_iso_resource(struct client *, struct client_resource *);
+
/*
* dequeue_event() just kfree()'s the event, so the event has to be
* the first field in a struct XYZ_event.
@@ -145,6 +162,11 @@ struct iso_interrupt_event {
struct fw_cdev_event_iso_interrupt interrupt;
};
+struct iso_resource_event {
+ struct event event;
+ struct fw_cdev_event_iso_resource resource;
+};
+
static inline void __user *u64_to_uptr(__u64 value)
{
return (void __user *)(unsigned long)value;
@@ -290,6 +312,16 @@ static void for_each_client(struct fw_device *device,
mutex_unlock(&device->client_list_mutex);
}
+static int schedule_reallocations(int id, void *p, void *data)
+{
+ struct client_resource *r = p;
+
+ if (r->release == release_iso_resource)
+ schedule_iso_resource(container_of(r,
+ struct iso_resource, resource));
+ return 0;
+}
+
static void queue_bus_reset_event(struct client *client)
{
struct bus_reset_event *e;
@@ -304,6 +336,10 @@ static void queue_bus_reset_event(struct client *client)
queue_event(client, &e->event,
&e->reset, sizeof(e->reset), NULL, 0);
+
+ spin_lock_irq(&client->lock);
+ idr_for_each(&client->resource_idr, schedule_reallocations, client);
+ spin_unlock_irq(&client->lock);
}
void fw_device_cdev_update(struct fw_device *device)
@@ -376,8 +412,12 @@ static int add_client_resource(struct client *client,
else
ret = idr_get_new(&client->resource_idr, resource,
&resource->handle);
- if (ret >= 0)
+ if (ret >= 0) {
client_get(client);
+ if (resource->release == release_iso_resource)
+ schedule_iso_resource(container_of(resource,
+ struct iso_resource, resource));
+ }
spin_unlock_irqrestore(&client->lock, flags);
if (ret == -EAGAIN)
@@ -970,6 +1010,177 @@ static int ioctl_get_cycle_timer(struct client *client, void *buffer)
return 0;
}
+static void iso_resource_work(struct work_struct *work)
+{
+ struct iso_resource_event *e;
+ struct iso_resource *r =
+ container_of(work, struct iso_resource, work.work);
+ struct client *client = r->client;
+ int generation, channel, bandwidth, todo;
+ bool skip, free, success;
+
+ spin_lock_irq(&client->lock);
+ generation = client->device->generation;
+ todo = r->todo;
+ /* Allow 1000ms grace period for other reallocations. */
+ if (todo == ISO_RES_ALLOC &&
+ time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
+ if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
+ client_get(client);
+ skip = true;
+ } else {
+ /* We could be called twice within the same generation. */
+ skip = todo == ISO_RES_REALLOC &&
+ r->generation == generation;
+ }
+ free = todo == ISO_RES_DEALLOC;
+ r->generation = generation;
+ spin_unlock_irq(&client->lock);
+
+ if (skip)
+ goto out;
+
+ bandwidth = r->bandwidth;
+
+ fw_iso_resource_manage(client->device->card, generation,
+ r->channels, &channel, &bandwidth,
+ todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC);
+ /*
+ * Is this generation outdated already? As long as this resource sticks
+ * in the idr, it will be scheduled again for a newer generation or at
+ * shutdown.
+ */
+ if (channel == -EAGAIN &&
+ (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
+ goto out;
+
+ success = channel >= 0 || bandwidth > 0;
+
+ spin_lock_irq(&client->lock);
+ /*
+ * Transit from allocation to reallocation, except if the client
+ * requested deallocation in the meantime.
+ */
+ if (r->todo == ISO_RES_ALLOC)
+ r->todo = ISO_RES_REALLOC;
+ /*
+ * Allocation or reallocation failure? Pull this resource out of the
+ * idr and prepare for deletion, unless the client is shutting down.
+ */
+ if (r->todo == ISO_RES_REALLOC && !success &&
+ !client->in_shutdown &&
+ idr_find(&client->resource_idr, r->resource.handle)) {
+ idr_remove(&client->resource_idr, r->resource.handle);
+ client_put(client);
+ free = true;
+ }
+ spin_unlock_irq(&client->lock);
+
+ if (todo == ISO_RES_ALLOC && channel >= 0)
+ r->channels = 1ULL << (63 - channel);
+
+ if (todo == ISO_RES_REALLOC && success)
+ goto out;
+
+ if (todo == ISO_RES_ALLOC) {
+ e = r->e_alloc;
+ r->e_alloc = NULL;
+ } else {
+ e = r->e_dealloc;
+ r->e_dealloc = NULL;
+ }
+ e->resource.handle = r->resource.handle;
+ e->resource.channel = channel;
+ e->resource.bandwidth = bandwidth;
+
+ queue_event(client, &e->event,
+ &e->resource, sizeof(e->resource), NULL, 0);
+
+ if (free) {
+ cancel_delayed_work(&r->work);
+ kfree(r->e_alloc);
+ kfree(r->e_dealloc);
+ kfree(r);
+ }
+ out:
+ client_put(client);
+}
+
+static void schedule_iso_resource(struct iso_resource *r)
+{
+ if (schedule_delayed_work(&r->work, 0))
+ client_get(r->client);
+}
+
+static void release_iso_resource(struct client *client,
+ struct client_resource *resource)
+{
+ struct iso_resource *r =
+ container_of(resource, struct iso_resource, resource);
+
+ spin_lock_irq(&client->lock);
+ r->todo = ISO_RES_DEALLOC;
+ schedule_iso_resource(r);
+ spin_unlock_irq(&client->lock);
+}
+
+static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
+{
+ struct fw_cdev_allocate_iso_resource *request = buffer;
+ struct iso_resource_event *e1, *e2;
+ struct iso_resource *r;
+ int ret;
+
+ if ((request->channels == 0 && request->bandwidth == 0) ||
+ request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
+ request->bandwidth < 0)
+ return -EINVAL;
+
+ r = kmalloc(sizeof(*r), GFP_KERNEL);
+ e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
+ e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
+ if (r == NULL || e1 == NULL || e2 == NULL) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ INIT_DELAYED_WORK(&r->work, iso_resource_work);
+ r->client = client;
+ r->todo = ISO_RES_ALLOC;
+ r->generation = -1;
+ r->channels = request->channels;
+ r->bandwidth = request->bandwidth;
+ r->e_alloc = e1;
+ r->e_dealloc = e2;
+
+ e1->resource.closure = request->closure;
+ e1->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
+ e2->resource.closure = request->closure;
+ e2->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
+
+ r->resource.release = release_iso_resource;
+ ret = add_client_resource(client, &r->resource, GFP_KERNEL);
+ if (ret < 0)
+ goto fail;
+ request->handle = r->resource.handle;
+
+ return 0;
+ fail:
+ kfree(r);
+ kfree(e1);
+ kfree(e2);
+
+ return ret;
+}
+
+static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
+{
+ struct fw_cdev_deallocate *request = buffer;
+
+ return release_client_resource(client, request->handle,
+ release_iso_resource, NULL);
+}
+
static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
ioctl_get_info,
ioctl_send_request,
@@ -984,6 +1195,8 @@ static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
ioctl_start_iso,
ioctl_stop_iso,
ioctl_get_cycle_timer,
+ ioctl_allocate_iso_resource,
+ ioctl_deallocate_iso_resource,
};
static int dispatch_ioctl(struct client *client,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-04 10:57:03 +0000