PCIe Control#
Functions | |
| rsmi_status_t | rsmi_dev_pci_bandwidth_set (uint32_t dv_ind, uint64_t bw_bitmask) |
| Control the set of allowed PCIe bandwidths that can be used. More... | |
Detailed Description
These functions provide some control over PCIe.
Function Documentation
◆ rsmi_dev_pci_bandwidth_set()
| rsmi_status_t rsmi_dev_pci_bandwidth_set | ( | uint32_t | dv_ind, |
| uint64_t | bw_bitmask | ||
| ) |
Control the set of allowed PCIe bandwidths that can be used.
Given a device index dv_ind and a 64 bit bitmask bw_bitmask, this function will limit the set of allowable bandwidths. If a bit in bw_bitmask has a value of 1, then the frequency (as ordered in an rsmi_frequencies_t returned by rsmi_dev_gpu_clk_freq_get()) corresponding to that bit index will be allowed.
This function will change the performance level to RSMI_DEV_PERF_LEVEL_MANUAL in order to modify the set of allowable band_widths. Caller will need to set to RSMI_DEV_PERF_LEVEL_AUTO in order to get back to default state.
All bits with indices greater than or equal to the value of the rsmi_frequencies_t::num_supported field of rsmi_pcie_bandwidth_t will be ignored.
- Parameters
-
[in] dv_ind a device index [in] bw_bitmask A bitmask indicating the indices of the bandwidths that are to be enabled (1) and disabled (0). Only the lowest rsmi_frequencies_t::num_supported (of rsmi_pcie_bandwidth_t) bits of this mask are relevant.
- Return values
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RSMI_STATUS_SUCCESS call was successful RSMI_STATUS_PERMISSION function requires root access