mirror of https://github.com/torvalds/linux.git
0d6dd4738d
This update includes the following changes.
- Refactor page allocation dedicated to 1394 OHCI IR/IT/AR DMA contexts
Although 1394 OHCI specification does not impose any restriction on
the memory size dedicated to these DMA contexts, 1394 OHCI PCI driver
allocates pages for convenience when mapping them into either kernel
space or userspace VMA. The driver previously used dma_alloc_pages()
for both page allocation and mapping creation, even though this kernel
API is rarely used. Following discussions questioning the page-oriented
kernel API in the DMA layer, the driver has been refactored to avoid
using this API. In addition, the use of private members in the
allocated pages has been removed following long-standing concern.
- Allocate variable-sized buffer for isochronous context header
1394 OHCI PCI driver previously allocated a single page for isochronous
context header. As a result, the buffer size for the header was fixed
to PAGE_SIZE, which imposed a limitation on IEC 61883-1/6 packet
streaming engine. Consequently, the ALSA PCM devices provided by
drivers for audio and music units in IEEE 1394 bus were constrained in
the maximum size of buffer period (64 ms in most cases). This limitation
is resolved by dynamically allocating the header buffer with an
arbitrary size.
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Merge tag 'firewire-updates-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394
Pull firewire updates from Takashi Sakamoto:
- Refactor page allocation dedicated to 1394 OHCI IR/IT/AR DMA contexts
Although 1394 OHCI specification does not impose any restriction on
the memory size dedicated to these DMA contexts, 1394 OHCI PCI driver
allocates pages for convenience when mapping them into either kernel
space or userspace VMA. The driver previously used dma_alloc_pages()
for both page allocation and mapping creation, even though this
kernel API is rarely used. Following discussions questioning the
page-oriented kernel API in the DMA layer, the driver has been
refactored to avoid using this API. In addition, the use of private
members in the allocated pages has been removed following
long-standing concern.
- Allocate variable-sized buffer for isochronous context header
1394 OHCI PCI driver previously allocated a single page for
isochronous context header. As a result, the buffer size for the
header was fixed to PAGE_SIZE, which imposed a limitation on IEC
61883-1/6 packet streaming engine. Consequently, the ALSA PCM devices
provided by drivers for audio and music units in IEEE 1394 bus were
constrained in the maximum size of buffer period (64 ms in most
cases). This limitation is resolved by dynamically allocating the
header buffer with an arbitrary size.
* tag 'firewire-updates-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
ALSA: firewire: remove PCM buffer size constraint from isoc context header
firewire: core: add fw_iso_context_create() variant with header storage size
firewire: core: provide isoc header buffer size outside card driver
firewire: ohci: allocate isoc context header by kvmalloc()
firewire: core: add flags member for isochronous context structure
firewire: ohci: use cleanup helper for isoc context header allocation
firewire: ohci: code refactoring to use union for isoc multiple channel state
firewire: ohci: refactor isoc single-channel state using a union
firewire: core: add function variants for isochronous context creation
firewire: ohci: fix index of pages for dma address to 1394 OHCI IT context
firewire: ohci: stop using page private to store DMA mapping address
firewire: ohci: split page allocation from dma mapping
firewire: ohci: use MAX macro to guarantee minimum count of pages for AR contexts
firewire: core: stop using page private to store DMA mapping address
firewire: core: use common kernel API to allocate and release a batch of pages
firewire: core: code refactoring with cleanup function for isoc pages
firewire: core: use mutex instead of spinlock for client isochronous context
firewire: core: move private function declaration from public header to internal header
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|---|---|---|
| .. | ||
| .kunitconfig | ||
| Kconfig | ||
| Makefile | ||
| core-card.c | ||
| core-cdev.c | ||
| core-device.c | ||
| core-iso.c | ||
| core-topology.c | ||
| core-trace.c | ||
| core-transaction.c | ||
| core.h | ||
| device-attribute-test.c | ||
| init_ohci1394_dma.c | ||
| net.c | ||
| nosy-user.h | ||
| nosy.c | ||
| nosy.h | ||
| ohci-serdes-test.c | ||
| ohci.c | ||
| ohci.h | ||
| packet-header-definitions.h | ||
| packet-serdes-test.c | ||
| phy-packet-definitions.h | ||
| sbp2.c | ||
| self-id-sequence-helper-test.c | ||
| uapi-test.c | ||