#include <linux/dma-mapping.h>
/**
- * enum dma_event - resource PNP/power managment events
- * @DMA_RESOURCE_SUSPEND: DMA device going into low power state
- * @DMA_RESOURCE_RESUME: DMA device returning to full power
- * @DMA_RESOURCE_ADDED: DMA device added to the system
- * @DMA_RESOURCE_REMOVED: DMA device removed from the system
- */
-enum dma_event {
- DMA_RESOURCE_SUSPEND,
- DMA_RESOURCE_RESUME,
- DMA_RESOURCE_ADDED,
- DMA_RESOURCE_REMOVED,
-};
-
-/**
* typedef dma_cookie_t - an opaque DMA cookie
*
* if dma_cookie_t is >0 it's a DMA request cookie, <0 it's an error code
DMA_MEMSET,
DMA_MEMCPY_CRC32C,
DMA_INTERRUPT,
+ DMA_PRIVATE,
+ DMA_SLAVE,
};
/* last transaction type for creation of the capabilities mask */
-#define DMA_TX_TYPE_END (DMA_INTERRUPT + 1)
+#define DMA_TX_TYPE_END (DMA_SLAVE + 1)
+
+
+/**
+ * enum dma_ctrl_flags - DMA flags to augment operation preparation,
+ * control completion, and communicate status.
+ * @DMA_PREP_INTERRUPT - trigger an interrupt (callback) upon completion of
+ * this transaction
+ * @DMA_CTRL_ACK - the descriptor cannot be reused until the client
+ * acknowledges receipt, i.e. has has a chance to establish any
+ * dependency chains
+ * @DMA_COMPL_SKIP_SRC_UNMAP - set to disable dma-unmapping the source buffer(s)
+ * @DMA_COMPL_SKIP_DEST_UNMAP - set to disable dma-unmapping the destination(s)
+ */
+enum dma_ctrl_flags {
+ DMA_PREP_INTERRUPT = (1 << 0),
+ DMA_CTRL_ACK = (1 << 1),
+ DMA_COMPL_SKIP_SRC_UNMAP = (1 << 2),
+ DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3),
+};
/**
* dma_cap_mask_t - capabilities bitmap modeled after cpumask_t.
/**
* struct dma_chan_percpu - the per-CPU part of struct dma_chan
- * @refcount: local_t used for open-coded "bigref" counting
* @memcpy_count: transaction counter
* @bytes_transferred: byte counter
*/
struct dma_chan_percpu {
- local_t refcount;
/* stats */
unsigned long memcpy_count;
unsigned long bytes_transferred;
/**
* struct dma_chan - devices supply DMA channels, clients use them
- * @client: ptr to the client user of this chan, will be %NULL when unused
* @device: ptr to the dma device who supplies this channel, always !%NULL
* @cookie: last cookie value returned to client
* @chan_id: channel ID for sysfs
- * @class_dev: class device for sysfs
- * @refcount: kref, used in "bigref" slow-mode
- * @slow_ref: indicates that the DMA channel is free
- * @rcu: the DMA channel's RCU head
- * @client_node: used to add this to the client chan list
+ * @dev: class device for sysfs
* @device_node: used to add this to the device chan list
* @local: per-cpu pointer to a struct dma_chan_percpu
+ * @client-count: how many clients are using this channel
+ * @table_count: number of appearances in the mem-to-mem allocation table
*/
struct dma_chan {
- struct dma_client *client;
struct dma_device *device;
dma_cookie_t cookie;
/* sysfs */
int chan_id;
- struct class_device class_dev;
-
- struct kref refcount;
- int slow_ref;
- struct rcu_head rcu;
+ struct dma_chan_dev *dev;
- struct list_head client_node;
struct list_head device_node;
struct dma_chan_percpu *local;
+ int client_count;
+ int table_count;
};
-void dma_chan_cleanup(struct kref *kref);
-
-static inline void dma_chan_get(struct dma_chan *chan)
-{
- if (unlikely(chan->slow_ref))
- kref_get(&chan->refcount);
- else {
- local_inc(&(per_cpu_ptr(chan->local, get_cpu())->refcount));
- put_cpu();
- }
-}
+/**
+ * struct dma_chan_dev - relate sysfs device node to backing channel device
+ * @chan - driver channel device
+ * @device - sysfs device
+ * @dev_id - parent dma_device dev_id
+ * @idr_ref - reference count to gate release of dma_device dev_id
+ */
+struct dma_chan_dev {
+ struct dma_chan *chan;
+ struct device device;
+ int dev_id;
+ atomic_t *idr_ref;
+};
-static inline void dma_chan_put(struct dma_chan *chan)
+static inline const char *dma_chan_name(struct dma_chan *chan)
{
- if (unlikely(chan->slow_ref))
- kref_put(&chan->refcount, dma_chan_cleanup);
- else {
- local_dec(&(per_cpu_ptr(chan->local, get_cpu())->refcount));
- put_cpu();
- }
+ return dev_name(&chan->dev->device);
}
-/*
- * typedef dma_event_callback - function pointer to a DMA event callback
- */
-typedef void (*dma_event_callback) (struct dma_client *client,
- struct dma_chan *chan, enum dma_event event);
+void dma_chan_cleanup(struct kref *kref);
/**
- * struct dma_client - info on the entity making use of DMA services
- * @event_callback: func ptr to call when something happens
- * @chan_count: number of chans allocated
- * @chans_desired: number of chans requested. Can be +/- chan_count
- * @lock: protects access to the channels list
- * @channels: the list of DMA channels allocated
- * @global_node: list_head for global dma_client_list
+ * typedef dma_filter_fn - callback filter for dma_request_channel
+ * @chan: channel to be reviewed
+ * @filter_param: opaque parameter passed through dma_request_channel
+ *
+ * When this optional parameter is specified in a call to dma_request_channel a
+ * suitable channel is passed to this routine for further dispositioning before
+ * being returned. Where 'suitable' indicates a non-busy channel that
+ * satisfies the given capability mask. It returns 'true' to indicate that the
+ * channel is suitable.
*/
-struct dma_client {
- dma_event_callback event_callback;
- unsigned int chan_count;
- unsigned int chans_desired;
-
- spinlock_t lock;
- struct list_head channels;
- struct list_head global_node;
-};
+typedef bool (*dma_filter_fn)(struct dma_chan *chan, void *filter_param);
typedef void (*dma_async_tx_callback)(void *dma_async_param);
/**
* ---dma generic offload fields---
* @cookie: tracking cookie for this transaction, set to -EBUSY if
* this tx is sitting on a dependency list
- * @ack: the descriptor can not be reused until the client acknowledges
- * receipt, i.e. has has a chance to establish any dependency chains
+ * @flags: flags to augment operation preparation, control completion, and
+ * communicate status
* @phys: physical address of the descriptor
* @tx_list: driver common field for operations that require multiple
* descriptors
* @chan: target channel for this operation
* @tx_submit: set the prepared descriptor(s) to be executed by the engine
- * @tx_set_dest: set a destination address in a hardware descriptor
- * @tx_set_src: set a source address in a hardware descriptor
* @callback: routine to call after this operation is complete
* @callback_param: general parameter to pass to the callback routine
* ---async_tx api specific fields---
- * @depend_list: at completion this list of transactions are submitted
- * @depend_node: allow this transaction to be executed after another
- * transaction has completed, possibly on another channel
+ * @next: at completion submit this descriptor
* @parent: pointer to the next level up in the dependency chain
- * @lock: protect the dependency list
+ * @lock: protect the parent and next pointers
*/
struct dma_async_tx_descriptor {
dma_cookie_t cookie;
- int ack;
+ enum dma_ctrl_flags flags; /* not a 'long' to pack with cookie */
dma_addr_t phys;
struct list_head tx_list;
struct dma_chan *chan;
dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx);
- void (*tx_set_dest)(dma_addr_t addr,
- struct dma_async_tx_descriptor *tx, int index);
- void (*tx_set_src)(dma_addr_t addr,
- struct dma_async_tx_descriptor *tx, int index);
dma_async_tx_callback callback;
void *callback_param;
- struct list_head depend_list;
- struct list_head depend_node;
+ struct dma_async_tx_descriptor *next;
struct dma_async_tx_descriptor *parent;
spinlock_t lock;
};
* @global_node: list_head for global dma_device_list
* @cap_mask: one or more dma_capability flags
* @max_xor: maximum number of xor sources, 0 if no capability
- * @refcount: reference count
- * @done: IO completion struct
* @dev_id: unique device ID
* @dev: struct device reference for dma mapping api
* @device_alloc_chan_resources: allocate resources and return the
* @device_prep_dma_zero_sum: prepares a zero_sum operation
* @device_prep_dma_memset: prepares a memset operation
* @device_prep_dma_interrupt: prepares an end of chain interrupt operation
- * @device_dependency_added: async_tx notifies the channel about new deps
+ * @device_prep_slave_sg: prepares a slave dma operation
+ * @device_terminate_all: terminate all pending operations
+ * @device_is_tx_complete: poll for transaction completion
* @device_issue_pending: push pending transactions to hardware
*/
struct dma_device {
dma_cap_mask_t cap_mask;
int max_xor;
- struct kref refcount;
- struct completion done;
-
int dev_id;
struct device *dev;
void (*device_free_chan_resources)(struct dma_chan *chan);
struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)(
- struct dma_chan *chan, size_t len, int int_en);
+ struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
+ size_t len, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_xor)(
- struct dma_chan *chan, unsigned int src_cnt, size_t len,
- int int_en);
+ struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
+ unsigned int src_cnt, size_t len, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)(
- struct dma_chan *chan, unsigned int src_cnt, size_t len,
- u32 *result, int int_en);
+ struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt,
+ size_t len, u32 *result, unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_memset)(
- struct dma_chan *chan, int value, size_t len, int int_en);
+ struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
+ unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)(
- struct dma_chan *chan);
+ struct dma_chan *chan, unsigned long flags);
+
+ struct dma_async_tx_descriptor *(*device_prep_slave_sg)(
+ struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_data_direction direction,
+ unsigned long flags);
+ void (*device_terminate_all)(struct dma_chan *chan);
- void (*device_dependency_added)(struct dma_chan *chan);
enum dma_status (*device_is_tx_complete)(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last,
dma_cookie_t *used);
/* --- public DMA engine API --- */
-struct dma_client *dma_async_client_register(dma_event_callback event_callback);
-void dma_async_client_unregister(struct dma_client *client);
-void dma_async_client_chan_request(struct dma_client *client,
- unsigned int number);
+#ifdef CONFIG_DMA_ENGINE
+void dmaengine_get(void);
+void dmaengine_put(void);
+#else
+static inline void dmaengine_get(void)
+{
+}
+static inline void dmaengine_put(void)
+{
+}
+#endif
+
+#ifdef CONFIG_NET_DMA
+#define net_dmaengine_get() dmaengine_get()
+#define net_dmaengine_put() dmaengine_put()
+#else
+static inline void net_dmaengine_get(void)
+{
+}
+static inline void net_dmaengine_put(void)
+{
+}
+#endif
+
dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
void *dest, void *src, size_t len);
dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan,
void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
struct dma_chan *chan);
+static inline void async_tx_ack(struct dma_async_tx_descriptor *tx)
+{
+ tx->flags |= DMA_CTRL_ACK;
+}
-static inline void
-async_tx_ack(struct dma_async_tx_descriptor *tx)
+static inline void async_tx_clear_ack(struct dma_async_tx_descriptor *tx)
+{
+ tx->flags &= ~DMA_CTRL_ACK;
+}
+
+static inline bool async_tx_test_ack(struct dma_async_tx_descriptor *tx)
{
- tx->ack = 1;
+ return (tx->flags & DMA_CTRL_ACK) == DMA_CTRL_ACK;
}
#define first_dma_cap(mask) __first_dma_cap(&(mask))
set_bit(tx_type, dstp->bits);
}
+#define dma_cap_zero(mask) __dma_cap_zero(&(mask))
+static inline void __dma_cap_zero(dma_cap_mask_t *dstp)
+{
+ bitmap_zero(dstp->bits, DMA_TX_TYPE_END);
+}
+
#define dma_has_cap(tx, mask) __dma_has_cap((tx), &(mask))
static inline int
__dma_has_cap(enum dma_transaction_type tx_type, dma_cap_mask_t *srcp)
*/
static inline void dma_async_issue_pending(struct dma_chan *chan)
{
- return chan->device->device_issue_pending(chan);
+ chan->device->device_issue_pending(chan);
}
#define dma_async_memcpy_issue_pending(chan) dma_async_issue_pending(chan)
* @last_used: last cookie value handed out
*
* dma_async_is_complete() is used in dma_async_memcpy_complete()
- * the test logic is seperated for lightweight testing of multiple cookies
+ * the test logic is separated for lightweight testing of multiple cookies
*/
static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie,
dma_cookie_t last_complete, dma_cookie_t last_used)
}
enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie);
+#ifdef CONFIG_DMA_ENGINE
+enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx);
+void dma_issue_pending_all(void);
+#else
+static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
+{
+ return DMA_SUCCESS;
+}
+static inline void dma_issue_pending_all(void)
+{
+ do { } while (0);
+}
+#endif
/* --- DMA device --- */
int dma_async_device_register(struct dma_device *device);
void dma_async_device_unregister(struct dma_device *device);
+void dma_run_dependencies(struct dma_async_tx_descriptor *tx);
+struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type);
+#define dma_request_channel(mask, x, y) __dma_request_channel(&(mask), x, y)
+struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, void *fn_param);
+void dma_release_channel(struct dma_chan *chan);
/* --- Helper iov-locking functions --- */
struct dma_page_list {
- char *base_address;
+ char __user *base_address;
int nr_pages;
struct page **pages;
};
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