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On older platforms (12.00) the PF driver must explicitly unblock VF's modifications to the GGTT. On newer platforms this capability is enabled by default. Bspec: 49908, 53204 Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240425143927.2265-1-michal.wajdeczko@intel.com
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2023-2024 Intel Corporation
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*/
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#include <drm/drm_managed.h>
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#include "regs/xe_sriov_regs.h"
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#include "xe_gt_sriov_pf.h"
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#include "xe_gt_sriov_pf_helpers.h"
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#include "xe_mmio.h"
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/*
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* VF's metadata is maintained in the flexible array where:
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* - entry [0] contains metadata for the PF (only if applicable),
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* - entries [1..n] contain metadata for VF1..VFn::
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*
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* <--------------------------- 1 + total_vfs ----------->
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* +-------+-------+-------+-----------------------+-------+
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* | 0 | 1 | 2 | | n |
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* +-------+-------+-------+-----------------------+-------+
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* | PF | VF1 | VF2 | ... ... | VFn |
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* +-------+-------+-------+-----------------------+-------+
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*/
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static int pf_alloc_metadata(struct xe_gt *gt)
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{
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unsigned int num_vfs = xe_gt_sriov_pf_get_totalvfs(gt);
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gt->sriov.pf.vfs = drmm_kcalloc(>_to_xe(gt)->drm, 1 + num_vfs,
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sizeof(*gt->sriov.pf.vfs), GFP_KERNEL);
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if (!gt->sriov.pf.vfs)
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return -ENOMEM;
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return 0;
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}
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/**
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* xe_gt_sriov_pf_init_early - Prepare SR-IOV PF data structures on PF.
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* @gt: the &xe_gt to initialize
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*
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* Early initialization of the PF data.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int xe_gt_sriov_pf_init_early(struct xe_gt *gt)
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{
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int err;
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err = pf_alloc_metadata(gt);
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if (err)
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return err;
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return 0;
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}
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static bool pf_needs_enable_ggtt_guest_update(struct xe_device *xe)
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{
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return GRAPHICS_VERx100(xe) == 1200;
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}
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static void pf_enable_ggtt_guest_update(struct xe_gt *gt)
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{
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xe_mmio_write32(gt, VIRTUAL_CTRL_REG, GUEST_GTT_UPDATE_EN);
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}
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/**
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* xe_gt_sriov_pf_init_hw - Initialize SR-IOV hardware support.
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* @gt: the &xe_gt to initialize
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*
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* On some platforms the PF must explicitly enable VF's access to the GGTT.
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*/
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void xe_gt_sriov_pf_init_hw(struct xe_gt *gt)
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{
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if (pf_needs_enable_ggtt_guest_update(gt_to_xe(gt)))
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pf_enable_ggtt_guest_update(gt);
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}
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