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6aa53e861c
The RDMA driver needs to map its own MMIO regions for the sake of performance, meaning the IDPF needs to avoid mapping portions of the BAR space. However, to be HW agnostic, the IDPF cannot assume where these are and must avoid mapping hard coded regions as much as possible. The IDPF maps the bare minimum to load and communicate with the control plane, i.e., the mailbox registers and the reset state registers. Because of how and when mailbox register offsets are initialized, it is easier to adjust the existing defines to be relative to the mailbox region starting address. Use a specific mailbox register write function that uses these relative offsets. The reset state register addresses are calculated the same way as for other registers, described below. The IDPF then calls a new virtchnl op to fetch a list of MMIO regions that it should map. The addresses for the registers in these regions are calculated by determining what region the register resides in, adjusting the offset to be relative to that region, and then adding the register's offset to that region's mapped address. If the new virtchnl op is not supported, the IDPF will fallback to mapping the whole bar. However, it will still map them as separate regions outside the mailbox and reset state registers. This way we can use the same logic in both cases to access the MMIO space. Reviewed-by: Madhu Chittim <madhu.chittim@intel.com> Signed-off-by: Joshua Hay <joshua.a.hay@intel.com> Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
21 lines
528 B
C
21 lines
528 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright (C) 2023 Intel Corporation */
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#ifndef _IDPF_MEM_H_
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#define _IDPF_MEM_H_
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#include <linux/io.h>
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struct idpf_dma_mem {
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void *va;
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dma_addr_t pa;
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size_t size;
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};
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#define idpf_mbx_wr32(a, reg, value) writel((value), ((a)->mbx.vaddr + (reg)))
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#define idpf_mbx_rd32(a, reg) readl((a)->mbx.vaddr + (reg))
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#define idpf_mbx_wr64(a, reg, value) writeq((value), ((a)->mbx.vaddr + (reg)))
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#define idpf_mbx_rd64(a, reg) readq((a)->mbx.vaddr + (reg))
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#endif /* _IDPF_MEM_H_ */
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