5b2599a07e
For correct cache coherency on some architectures, DMA buffers must be allocated in a different cache line than data that is concurrently used by the CPU. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
#ifndef SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
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#define SOUND_FIREWIRE_ISO_RESOURCES_H_INCLUDED
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#include <linux/mutex.h>
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#include <linux/types.h>
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struct fw_unit;
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/**
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* struct fw_iso_resources - manages channel/bandwidth allocation
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* @channels_mask: if the device does not support all channel numbers, set this
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* bit mask to something else than the default (all ones)
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*
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* This structure manages (de)allocation of isochronous resources (channel and
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* bandwidth) for one isochronous stream.
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*/
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struct fw_iso_resources {
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u64 channels_mask;
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/* private: */
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struct fw_unit *unit;
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struct mutex mutex;
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unsigned int channel;
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unsigned int bandwidth; /* in bandwidth units, without overhead */
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unsigned int bandwidth_overhead;
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int generation; /* in which allocation is valid */
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bool allocated;
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__be32 *buffer;
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};
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int fw_iso_resources_init(struct fw_iso_resources *r,
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struct fw_unit *unit);
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void fw_iso_resources_destroy(struct fw_iso_resources *r);
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int fw_iso_resources_allocate(struct fw_iso_resources *r,
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unsigned int max_payload_bytes, int speed);
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int fw_iso_resources_update(struct fw_iso_resources *r);
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void fw_iso_resources_free(struct fw_iso_resources *r);
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#endif
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