US 10,120,832 B2Granted

Direct access to local memory in a PCI-E device

AssigneeMellanox Technologies, Ltd.

InventorsShachar Raindel, Idan Burstein, Noam Bloch, Shlomo Raikin

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Abstract

A method includes communicating between at least first and second devices over a bus in accordance with a bus address space, including providing direct access over the bus to a local address space of the first device by mapping at least some of the addresses of the local address space to the bus address space. In response to indicating, by the first device or the second device, that the second device requires to access a local address in the local address space that is not currently mapped to the bus address space, the local address is mapped to the bus address space, and the local address is accessed directly, by the second device, using the mapping.

Claims28

Dependent claims

A method, comprising:

allocating, to a first device coupled to a bus that operates in accordance with a bus address space, multiple bus addresses of the bus address space;
providing direct access over the bus to a local address space of the first device by defining a mapping between at least some of the addresses of the local address space and the allocated bus addresses of the bus address space;
in response to detecting that a second device requires to access a given local address in the local address space of the first device that is not currently mapped by the defined mapping to any of the allocated bus addresses, modifying the defined mapping to also map the given local address of the first device to a respective bus address among the allocated bus addresses;
and
accessing the given local address of the first device directly, by the second device, using the modified mapping of the defined mapping.

2 more elements

Apparatus, comprising:

first and second devices, which are configured to communicate over a bus in accordance with a bus address space, wherein multiple bus addresses of the bus address space are allocated to the first device,
wherein the first device is configured to provide direct access over the bus to a local address space by defining a mapping between at least some of the addresses in the local address space and the allocated bus addresses of the bus address space,
and wherein, in response to detecting by the first device or the second device that the second device requires to access a given local address in the local address space of the first device that is not currently mapped by the defined mapping to any of the allocated bus addresses, the first device is configured to modify the mapping to also map the given local address to a respective bus address among the allocated bus addresses, and the second device is configured to access the given local address directly, using the modified mapping of the defined mapping.

Dependencies are inferred from the claim text.

Facts

Application: 14/721,009Filed 26 May 2015 · us provisional application
Priority: 27 May 2014
Published: US 2015/0347349 A13 Dec 2015
Granted: 6 Nov 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G06F 15/17331
Intercommunication techniques: distributed shared memory [DSM], e.g. remote direct memory access [RDMA]
G06F 13/28
For access to input/output bus: using burst mode transfer, e.g. direct memory access DMA, cycle steal
G06F 13/4221
On a parallel bus: being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
G06F
Computing and data processing

Family

Application62/003,089Us provisional application · filed 27 May 2014
US 2015/0347349 A1Pre-grant publication · published 3 Dec 2015
US 10,120,832 B2This patent

From the US filing history. Foreign family members aren’t listed.

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