linux/drivers/misc
Kenneth Lee 015d239ac0 uacce: add uacce driver
Uacce (Unified/User-space-access-intended Accelerator Framework) targets to
provide Shared Virtual Addressing (SVA) between accelerators and processes.
So accelerator can access any data structure of the main cpu.
This differs from the data sharing between cpu and io device, which share
only data content rather than address.
Since unified address, hardware and user space of process can share the
same virtual address in the communication.

Uacce create a chrdev for every registration, the queue is allocated to
the process when the chrdev is opened. Then the process can access the
hardware resource by interact with the queue file. By mmap the queue
file space to user space, the process can directly put requests to the
hardware without syscall to the kernel space.

The IOMMU core only tracks mm<->device bonds at the moment, because it
only needs to handle IOTLB invalidation and PASID table entries. However
uacce needs a finer granularity since multiple queues from the same
device can be bound to an mm. When the mm exits, all bound queues must
be stopped so that the IOMMU can safely clear the PASID table entry and
reallocate the PASID.

An intermediate struct uacce_mm links uacce devices and queues.
Note that an mm may be bound to multiple devices but an uacce_mm
structure only ever belongs to a single device, because we don't need
anything more complex (if multiple devices are bound to one mm, then
we'll create one uacce_mm for each bond).

        uacce_device --+-- uacce_mm --+-- uacce_queue
                       |              '-- uacce_queue
                       |
                       '-- uacce_mm --+-- uacce_queue
                                      +-- uacce_queue
                                      '-- uacce_queue

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
Signed-off-by: Zaibo Xu <xuzaibo@huawei.com>
Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2020-02-22 09:25:42 +08:00
..
altera-stapl
c2port
cardreader Char/Misc driver changes for 5.6-rc1 2020-01-29 10:35:54 -08:00
cb710
cxl misc: cxl: use mmgrab 2020-01-16 14:59:36 +10:00
echo
eeprom misc: eeprom: at24: support pm_runtime control 2020-01-23 12:52:57 +01:00
genwqe misc: genwqe: fix compile warnings 2020-01-14 15:06:06 +01:00
habanalabs habanalabs: remove variable 'val' set but not used 2019-12-14 15:12:21 +02:00
ibmasm
lis3lv02d lis3lv02d: switch to using input device polling mode 2019-10-10 15:24:19 +02:00
lkdtm lkdtm/bugs: fix build error in lkdtm_UNSET_SMEP 2020-01-14 15:41:04 +01:00
mei mei: me: add jasper point DID 2020-01-24 09:33:58 +01:00
mic Char/Misc driver changes for 5.6-rc1 2020-01-29 10:35:54 -08:00
ocxl ocxl: Add PCI hotplug dependency to Kconfig 2020-01-23 21:31:18 +11:00
sgi-gru proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
sgi-xp netdev: pass the stuck queue to the timeout handler 2019-12-12 21:38:57 -08:00
ti-st drivers/misc: ti-st: remove redundant assignment to variables i and flags 2020-01-14 15:16:51 +01:00
uacce uacce: add uacce driver 2020-02-22 09:25:42 +08:00
vmw_vmci compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
ad525x_dpot-i2c.c
ad525x_dpot-spi.c
ad525x_dpot.c
ad525x_dpot.h
apds990x.c
apds9802als.c
atmel_tclib.c misc: atmel_tclib: use devm_platform_ioremap_resource() to simplify code 2019-10-10 15:24:19 +02:00
atmel-ssc.c
bh1770glc.c
cs5535-mfgpt.c
ds1682.c
dummy-irq.c
enclosure.c scsi: enclosure: Fix stale device oops with hot replug 2020-01-10 01:38:40 -05:00
fastrpc.c drm-misc-next for v5.6: 2019-12-17 13:57:54 +01:00
hmc6352.c
hpilo.c
hpilo.h misc: Use the correct style for SPDX License Identifier 2019-10-10 15:34:40 +02:00
ibmvmc.c
ibmvmc.h misc: Use the correct style for SPDX License Identifier 2019-10-10 15:34:40 +02:00
ics932s401.c
isl29003.c
isl29020.c misc: isl29020: add missed pm_runtime_disable 2020-01-14 15:06:07 +01:00
Kconfig uacce: add uacce driver 2020-02-22 09:25:42 +08:00
kgdbts.c
lattice-ecp3-config.c
Makefile uacce: add uacce driver 2020-02-22 09:25:42 +08:00
pch_phub.c
pci_endpoint_test.c PCI: Add PCI_STD_NUM_BARS for the number of standard BARs 2019-10-14 10:22:26 -05:00
phantom.c
pti.c Char/Misc driver changes for 5.6-rc1 2020-01-29 10:35:54 -08:00
pvpanic.c misc: pvpanic: add crash loaded event 2020-01-14 15:07:37 +01:00
qcom-coincell.c
sram-exec.c drivers/misc: sram-exec: have the callers of set_memory_*() check the return value 2020-01-14 15:06:06 +01:00
sram.c misc: sram: use devm_platform_ioremap_resource_wc() 2019-11-05 18:32:47 +01:00
sram.h
tifm_7xx1.c
tifm_core.c
tsl2550.c misc: tsl2550: remove redundant initialization to variable r 2020-01-14 15:16:51 +01:00
vexpress-syscfg.c
vmw_balloon.c vmw_balloon: Explicitly include linux/io.h for virt_to_phys() 2019-12-10 10:15:48 +01:00
xilinx_sdfec.c misc: xilinx_sdfec: fix xsdfec_poll()'s return type 2020-01-14 15:16:51 +01:00