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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023-2024 Intel Corporation
*/
#include <drm/drm_managed.h>
#include "regs/xe_guc_regs.h"
#include "regs/xe_regs.h"
#include "xe_gt.h"
#include "xe_gt_sriov_pf.h"
#include "xe_gt_sriov_pf_config.h"
#include "xe_gt_sriov_pf_control.h"
#include "xe_gt_sriov_pf_helpers.h"
#include "xe_gt_sriov_pf_service.h"
#include "xe_gt_sriov_printk.h"
#include "xe_mmio.h"
#include "xe_pm.h"
static void pf_worker_restart_func(struct work_struct *w);
/*
* VF's metadata is maintained in the flexible array where:
* - entry [0] contains metadata for the PF (only if applicable),
* - entries [1..n] contain metadata for VF1..VFn::
*
* <--------------------------- 1 + total_vfs ----------->
* +-------+-------+-------+-----------------------+-------+
* | 0 | 1 | 2 | | n |
* +-------+-------+-------+-----------------------+-------+
* | PF | VF1 | VF2 | ... ... | VFn |
* +-------+-------+-------+-----------------------+-------+
*/
static int pf_alloc_metadata(struct xe_gt *gt)
{
unsigned int num_vfs = xe_gt_sriov_pf_get_totalvfs(gt);
gt->sriov.pf.vfs = drmm_kcalloc(>_to_xe(gt)->drm, 1 + num_vfs,
sizeof(*gt->sriov.pf.vfs), GFP_KERNEL);
if (!gt->sriov.pf.vfs)
return -ENOMEM;
return 0;
}
static void pf_init_workers(struct xe_gt *gt)
{
INIT_WORK(>->sriov.pf.workers.restart, pf_worker_restart_func);
}
/**
* xe_gt_sriov_pf_init_early - Prepare SR-IOV PF data structures on PF.
* @gt: the &xe_gt to initialize
*
* Early initialization of the PF data.
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_gt_sriov_pf_init_early(struct xe_gt *gt)
{
int err;
err = pf_alloc_metadata(gt);
if (err)
return err;
err = xe_gt_sriov_pf_service_init(gt);
if (err)
return err;
err = xe_gt_sriov_pf_control_init(gt);
if (err)
return err;
pf_init_workers(gt);
return 0;
}
static bool pf_needs_enable_ggtt_guest_update(struct xe_device *xe)
{
return GRAPHICS_VERx100(xe) == 1200;
}
static void pf_enable_ggtt_guest_update(struct xe_gt *gt)
{
xe_mmio_write32(gt, VIRTUAL_CTRL_REG, GUEST_GTT_UPDATE_EN);
}
/**
* xe_gt_sriov_pf_init_hw - Initialize SR-IOV hardware support.
* @gt: the &xe_gt to initialize
*
* On some platforms the PF must explicitly enable VF's access to the GGTT.
*/
void xe_gt_sriov_pf_init_hw(struct xe_gt *gt)
{
if (pf_needs_enable_ggtt_guest_update(gt_to_xe(gt)))
pf_enable_ggtt_guest_update(gt);
xe_gt_sriov_pf_service_update(gt);
}
static u32 pf_get_vf_regs_stride(struct xe_device *xe)
{
return GRAPHICS_VERx100(xe) > 1200 ? 0x400 : 0x1000;
}
static struct xe_reg xe_reg_vf_to_pf(struct xe_reg vf_reg, unsigned int vfid, u32 stride)
{
struct xe_reg pf_reg = vf_reg;
pf_reg.vf = 0;
pf_reg.addr += stride * vfid;
return pf_reg;
}
static void pf_clear_vf_scratch_regs(struct xe_gt *gt, unsigned int vfid)
{
u32 stride = pf_get_vf_regs_stride(gt_to_xe(gt));
struct xe_reg scratch;
int n, count;
if (xe_gt_is_media_type(gt)) {
count = MED_VF_SW_FLAG_COUNT;
for (n = 0; n < count; n++) {
scratch = xe_reg_vf_to_pf(MED_VF_SW_FLAG(n), vfid, stride);
xe_mmio_write32(gt, scratch, 0);
}
} else {
count = VF_SW_FLAG_COUNT;
for (n = 0; n < count; n++) {
scratch = xe_reg_vf_to_pf(VF_SW_FLAG(n), vfid, stride);
xe_mmio_write32(gt, scratch, 0);
}
}
}
/**
* xe_gt_sriov_pf_sanitize_hw() - Reset hardware state related to a VF.
* @gt: the &xe_gt
* @vfid: the VF identifier
*
* This function can only be called on PF.
*/
void xe_gt_sriov_pf_sanitize_hw(struct xe_gt *gt, unsigned int vfid)
{
xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt)));
pf_clear_vf_scratch_regs(gt, vfid);
}
static void pf_cancel_restart(struct xe_gt *gt)
{
xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt)));
if (cancel_work_sync(>->sriov.pf.workers.restart))
xe_gt_sriov_dbg_verbose(gt, "pending restart canceled!\n");
}
/**
* xe_gt_sriov_pf_stop_prepare() - Prepare to stop SR-IOV support.
* @gt: the &xe_gt
*
* This function can only be called on the PF.
*/
void xe_gt_sriov_pf_stop_prepare(struct xe_gt *gt)
{
pf_cancel_restart(gt);
}
static void pf_restart(struct xe_gt *gt)
{
struct xe_device *xe = gt_to_xe(gt);
xe_pm_runtime_get(xe);
xe_gt_sriov_pf_config_restart(gt);
xe_gt_sriov_pf_control_restart(gt);
xe_pm_runtime_put(xe);
xe_gt_sriov_dbg(gt, "restart completed\n");
}
static void pf_worker_restart_func(struct work_struct *w)
{
struct xe_gt *gt = container_of(w, typeof(*gt), sriov.pf.workers.restart);
pf_restart(gt);
}
static void pf_queue_restart(struct xe_gt *gt)
{
struct xe_device *xe = gt_to_xe(gt);
xe_gt_assert(gt, IS_SRIOV_PF(xe));
if (!queue_work(xe->sriov.wq, >->sriov.pf.workers.restart))
xe_gt_sriov_dbg(gt, "restart already in queue!\n");
}
/**
* xe_gt_sriov_pf_restart - Restart SR-IOV support after a GT reset.
* @gt: the &xe_gt
*
* This function can only be called on PF.
*/
void xe_gt_sriov_pf_restart(struct xe_gt *gt)
{
pf_queue_restart(gt);
}
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