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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jul 2021 08:18:18.5336 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 709a5c98-ee9c-4287-c411-08d94b56ee45 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT029.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1821 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Edward Srouji Add some auxiliary functions to mem_alloc module to expose to Python users the ability to read/write from/to memory, with chuncks of 4/8 bytes. In addition, expose udma memory barriers and the ability to write on MMIO. Reviewed-by: Ido Kalir Signed-off-by: Edward Srouji --- pyverbs/CMakeLists.txt | 7 +++++++ pyverbs/dma_util.pyx | 25 +++++++++++++++++++++++++ pyverbs/mem_alloc.pyx | 46 +++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 77 insertions(+), 1 deletion(-) create mode 100644 pyverbs/dma_util.pyx diff --git a/pyverbs/CMakeLists.txt b/pyverbs/CMakeLists.txt index c532b4c..f403719 100644 --- a/pyverbs/CMakeLists.txt +++ b/pyverbs/CMakeLists.txt @@ -12,6 +12,12 @@ else() set(DMABUF_ALLOC dmabuf_alloc_stub.c) endif() +if (HAVE_COHERENT_DMA) + set(DMA_UTIL dma_util.pyx) +else() + set(DMA_UTIL "") +endif() + rdma_cython_module(pyverbs "" addr.pyx base.pyx @@ -19,6 +25,7 @@ rdma_cython_module(pyverbs "" cmid.pyx cq.pyx device.pyx + ${DMA_UTIL} dmabuf.pyx ${DMABUF_ALLOC} enums.pyx diff --git a/pyverbs/dma_util.pyx b/pyverbs/dma_util.pyx new file mode 100644 index 0000000..36d5f9b --- /dev/null +++ b/pyverbs/dma_util.pyx @@ -0,0 +1,25 @@ +# SPDX-License-Identifier: (GPL-2.0 OR Linux-OpenIB) +# Copyright (c) 2021 Nvidia, Inc. All rights reserved. See COPYING file + +#cython: language_level=3 + +from libc.stdint cimport uintptr_t, uint64_t + +cdef extern from 'util/udma_barrier.h': + cdef void udma_to_device_barrier() + cdef void udma_from_device_barrier() + +cdef extern from 'util/mmio.h': + cdef void mmio_write64_be(void *addr, uint64_t val) + + +def udma_to_dev_barrier(): + udma_to_device_barrier() + + +def udma_from_dev_barrier(): + udma_from_device_barrier() + + +def mmio_write64_as_be(addr, val): + mmio_write64_be( addr, val) diff --git a/pyverbs/mem_alloc.pyx b/pyverbs/mem_alloc.pyx index 24be4f1..c6290f7 100644 --- a/pyverbs/mem_alloc.pyx +++ b/pyverbs/mem_alloc.pyx @@ -6,13 +6,17 @@ from posix.stdlib cimport posix_memalign as c_posix_memalign from libc.stdlib cimport malloc as c_malloc, free as c_free from posix.mman cimport mmap as c_mmap, munmap as c_munmap -from libc.stdint cimport uintptr_t +from libc.stdint cimport uintptr_t, uint32_t, uint64_t from libc.string cimport memset cimport posix.mman as mm cdef extern from 'sys/mman.h': cdef void* MAP_FAILED +cdef extern from 'endian.h': + unsigned long htobe32(unsigned long host_32bits) + unsigned long htobe64(unsigned long host_64bits) + def mmap(addr=0, length=100, prot=mm.PROT_READ | mm.PROT_WRITE, flags=mm.MAP_PRIVATE | mm.MAP_ANONYMOUS, fd=0, offset=0): @@ -82,6 +86,46 @@ def free(ptr): c_free(ptr) +def writebe32(addr, val, offset=0): + """ + Write 32-bit value as Big Endian to address and offset + :param addr: The start of the address to write the value to + :param val: Value to write + :param offset: Offset of the address to write the value to (in 4-bytes) + """ + (addr)[offset] = htobe32(val) + + +def writebe64(addr, val, offset=0): + """ + Write 64-bit value as Big Endian to address and offset + :param addr: The start of the address to write the value to + :param val: Value to write + :param offset: Offset of the address to write the value to (in 8-bytes) + """ + (addr)[offset] = htobe64(val) + + +def read32(addr, offset=0): + """ + Read 32-bit value from address and offset + :param addr: The start of the address to read from + :param offset: Offset of the address to read from (in 4-bytes) + :return: The read value + """ + return (addr)[offset] + + +def read64(addr, offset=0): + """ + Read 64-bit value from address and offset + :param addr: The start of the address to read from + :param offset: Offset of the address to read from (in 8-bytes) + :return: The read value + """ + return (addr)[offset] + + # protection bits for mmap/mprotect PROT_EXEC_ = mm.PROT_EXEC PROT_READ_ = mm.PROT_READ -- 1.8.3.1