7f8f209fd6
The Qualcomm Technologies HIDMA device has been designed to support virtualization technology. The driver has been divided into two to follow the hardware design. 1. HIDMA Management driver 2. HIDMA Channel driver Each HIDMA HW consists of multiple channels. These channels share some set of common parameters. These parameters are initialized by the management driver during power up. Same management driver is used for monitoring the execution of the channels. Management driver can change the performance behavior dynamically such as bandwidth allocation and prioritization. The management driver is executed in host context and is the main management entity for all channels provided by the device. Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
98 lines
3.4 KiB
Plaintext
98 lines
3.4 KiB
Plaintext
What: /sys/devices/platform/hidma-mgmt*/chanops/chan*/priority
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/sys/devices/platform/QCOM8060:*/chanops/chan*/priority
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Contains either 0 or 1 and indicates if the DMA channel is a
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low priority (0) or high priority (1) channel.
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What: /sys/devices/platform/hidma-mgmt*/chanops/chan*/weight
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/sys/devices/platform/QCOM8060:*/chanops/chan*/weight
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Contains 0..15 and indicates the weight of the channel among
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equal priority channels during round robin scheduling.
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What: /sys/devices/platform/hidma-mgmt*/chreset_timeout_cycles
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/sys/devices/platform/QCOM8060:*/chreset_timeout_cycles
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Contains the platform specific cycle value to wait after a
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reset command is issued. If the value is chosen too short,
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then the HW will issue a reset failure interrupt. The value
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is platform specific and should not be changed without
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consultance.
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What: /sys/devices/platform/hidma-mgmt*/dma_channels
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/sys/devices/platform/QCOM8060:*/dma_channels
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Contains the number of dma channels supported by one instance
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of HIDMA hardware. The value may change from chip to chip.
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What: /sys/devices/platform/hidma-mgmt*/hw_version_major
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/sys/devices/platform/QCOM8060:*/hw_version_major
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Version number major for the hardware.
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What: /sys/devices/platform/hidma-mgmt*/hw_version_minor
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/sys/devices/platform/QCOM8060:*/hw_version_minor
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Version number minor for the hardware.
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What: /sys/devices/platform/hidma-mgmt*/max_rd_xactions
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/sys/devices/platform/QCOM8060:*/max_rd_xactions
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Contains a value between 0 and 31. Maximum number of
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read transactions that can be issued back to back.
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Choosing a higher number gives better performance but
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can also cause performance reduction to other peripherals
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sharing the same bus.
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What: /sys/devices/platform/hidma-mgmt*/max_read_request
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/sys/devices/platform/QCOM8060:*/max_read_request
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Size of each read request. The value needs to be a power
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of two and can be between 128 and 1024.
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What: /sys/devices/platform/hidma-mgmt*/max_wr_xactions
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/sys/devices/platform/QCOM8060:*/max_wr_xactions
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Contains a value between 0 and 31. Maximum number of
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write transactions that can be issued back to back.
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Choosing a higher number gives better performance but
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can also cause performance reduction to other peripherals
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sharing the same bus.
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What: /sys/devices/platform/hidma-mgmt*/max_write_request
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/sys/devices/platform/QCOM8060:*/max_write_request
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Date: Nov 2015
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KernelVersion: 4.4
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Contact: "Sinan Kaya <okaya@cudeaurora.org>"
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Description:
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Size of each write request. The value needs to be a power
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of two and can be between 128 and 1024.
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