// SPDX-License-Identifier: GPL-2.0+
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// Copyright 2019 IBM Corp.
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#include <linux/idr.h>
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#include "ocxl_internal.h"
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static struct ocxl_fn *ocxl_fn_get(struct ocxl_fn *fn)
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{
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return (get_device(&fn->dev) == NULL) ? NULL : fn;
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}
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static void ocxl_fn_put(struct ocxl_fn *fn)
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{
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put_device(&fn->dev);
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}
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static struct ocxl_afu *alloc_afu(struct ocxl_fn *fn)
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{
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struct ocxl_afu *afu;
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afu = kzalloc(sizeof(struct ocxl_afu), GFP_KERNEL);
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if (!afu)
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return NULL;
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kref_init(&afu->kref);
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mutex_init(&afu->contexts_lock);
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mutex_init(&afu->afu_control_lock);
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idr_init(&afu->contexts_idr);
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afu->fn = fn;
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ocxl_fn_get(fn);
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return afu;
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}
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static void free_afu(struct kref *kref)
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{
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struct ocxl_afu *afu = container_of(kref, struct ocxl_afu, kref);
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idr_destroy(&afu->contexts_idr);
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ocxl_fn_put(afu->fn);
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kfree(afu);
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}
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void ocxl_afu_get(struct ocxl_afu *afu)
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{
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kref_get(&afu->kref);
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}
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EXPORT_SYMBOL_GPL(ocxl_afu_get);
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void ocxl_afu_put(struct ocxl_afu *afu)
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{
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kref_put(&afu->kref, free_afu);
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}
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EXPORT_SYMBOL_GPL(ocxl_afu_put);
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static int assign_afu_actag(struct ocxl_afu *afu)
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{
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struct ocxl_fn *fn = afu->fn;
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int actag_count, actag_offset;
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struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
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/*
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* if there were not enough actags for the function, each afu
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* reduces its count as well
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*/
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actag_count = afu->config.actag_supported *
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fn->actag_enabled / fn->actag_supported;
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actag_offset = ocxl_actag_afu_alloc(fn, actag_count);
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if (actag_offset < 0) {
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dev_err(&pci_dev->dev, "Can't allocate %d actags for AFU: %d\n",
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actag_count, actag_offset);
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return actag_offset;
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}
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afu->actag_base = fn->actag_base + actag_offset;
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afu->actag_enabled = actag_count;
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ocxl_config_set_afu_actag(pci_dev, afu->config.dvsec_afu_control_pos,
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afu->actag_base, afu->actag_enabled);
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dev_dbg(&pci_dev->dev, "actag base=%d enabled=%d\n",
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afu->actag_base, afu->actag_enabled);
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return 0;
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}
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static void reclaim_afu_actag(struct ocxl_afu *afu)
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{
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struct ocxl_fn *fn = afu->fn;
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int start_offset, size;
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start_offset = afu->actag_base - fn->actag_base;
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size = afu->actag_enabled;
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ocxl_actag_afu_free(afu->fn, start_offset, size);
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}
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static int assign_afu_pasid(struct ocxl_afu *afu)
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{
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struct ocxl_fn *fn = afu->fn;
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int pasid_count, pasid_offset;
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struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
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/*
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* We only support the case where the function configuration
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* requested enough PASIDs to cover all AFUs.
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*/
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pasid_count = 1 << afu->config.pasid_supported_log;
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pasid_offset = ocxl_pasid_afu_alloc(fn, pasid_count);
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if (pasid_offset < 0) {
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dev_err(&pci_dev->dev, "Can't allocate %d PASIDs for AFU: %d\n",
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pasid_count, pasid_offset);
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return pasid_offset;
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}
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afu->pasid_base = fn->pasid_base + pasid_offset;
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afu->pasid_count = 0;
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afu->pasid_max = pasid_count;
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ocxl_config_set_afu_pasid(pci_dev, afu->config.dvsec_afu_control_pos,
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afu->pasid_base,
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afu->config.pasid_supported_log);
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dev_dbg(&pci_dev->dev, "PASID base=%d, enabled=%d\n",
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afu->pasid_base, pasid_count);
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return 0;
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}
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static void reclaim_afu_pasid(struct ocxl_afu *afu)
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{
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struct ocxl_fn *fn = afu->fn;
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int start_offset, size;
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start_offset = afu->pasid_base - fn->pasid_base;
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size = 1 << afu->config.pasid_supported_log;
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ocxl_pasid_afu_free(afu->fn, start_offset, size);
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}
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static int reserve_fn_bar(struct ocxl_fn *fn, int bar)
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{
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struct pci_dev *dev = to_pci_dev(fn->dev.parent);
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int rc, idx;
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if (bar != 0 && bar != 2 && bar != 4)
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return -EINVAL;
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idx = bar >> 1;
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if (fn->bar_used[idx]++ == 0) {
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rc = pci_request_region(dev, bar, "ocxl");
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if (rc)
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return rc;
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}
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return 0;
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}
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static void release_fn_bar(struct ocxl_fn *fn, int bar)
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{
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struct pci_dev *dev = to_pci_dev(fn->dev.parent);
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int idx;
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if (bar != 0 && bar != 2 && bar != 4)
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return;
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idx = bar >> 1;
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if (--fn->bar_used[idx] == 0)
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pci_release_region(dev, bar);
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WARN_ON(fn->bar_used[idx] < 0);
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}
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static int map_mmio_areas(struct ocxl_afu *afu)
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{
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int rc;
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struct pci_dev *pci_dev = to_pci_dev(afu->fn->dev.parent);
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rc = reserve_fn_bar(afu->fn, afu->config.global_mmio_bar);
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if (rc)
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return rc;
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rc = reserve_fn_bar(afu->fn, afu->config.pp_mmio_bar);
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if (rc) {
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release_fn_bar(afu->fn, afu->config.global_mmio_bar);
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return rc;
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}
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afu->global_mmio_start =
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pci_resource_start(pci_dev, afu->config.global_mmio_bar) +
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afu->config.global_mmio_offset;
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afu->pp_mmio_start =
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pci_resource_start(pci_dev, afu->config.pp_mmio_bar) +
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afu->config.pp_mmio_offset;
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afu->global_mmio_ptr = ioremap(afu->global_mmio_start,
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afu->config.global_mmio_size);
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if (!afu->global_mmio_ptr) {
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release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
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release_fn_bar(afu->fn, afu->config.global_mmio_bar);
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dev_err(&pci_dev->dev, "Error mapping global mmio area\n");
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return -ENOMEM;
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}
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/*
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* Leave an empty page between the per-process mmio area and
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* the AFU interrupt mappings
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*/
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afu->irq_base_offset = afu->config.pp_mmio_stride + PAGE_SIZE;
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return 0;
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}
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static void unmap_mmio_areas(struct ocxl_afu *afu)
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{
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if (afu->global_mmio_ptr) {
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iounmap(afu->global_mmio_ptr);
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afu->global_mmio_ptr = NULL;
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}
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afu->global_mmio_start = 0;
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afu->pp_mmio_start = 0;
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release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
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release_fn_bar(afu->fn, afu->config.global_mmio_bar);
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}
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static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
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{
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int rc;
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rc = ocxl_config_read_afu(dev, &afu->fn->config, &afu->config, afu_idx);
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if (rc)
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return rc;
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rc = assign_afu_actag(afu);
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if (rc)
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return rc;
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rc = assign_afu_pasid(afu);
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if (rc)
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goto err_free_actag;
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rc = map_mmio_areas(afu);
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if (rc)
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goto err_free_pasid;
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return 0;
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err_free_pasid:
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reclaim_afu_pasid(afu);
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err_free_actag:
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reclaim_afu_actag(afu);
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return rc;
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}
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static void deconfigure_afu(struct ocxl_afu *afu)
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{
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unmap_mmio_areas(afu);
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reclaim_afu_pasid(afu);
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reclaim_afu_actag(afu);
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}
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static int activate_afu(struct pci_dev *dev, struct ocxl_afu *afu)
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{
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ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 1);
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return 0;
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}
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static void deactivate_afu(struct ocxl_afu *afu)
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{
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struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
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ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 0);
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}
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static int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx)
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{
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int rc;
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struct ocxl_afu *afu;
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afu = alloc_afu(fn);
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if (!afu)
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return -ENOMEM;
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rc = configure_afu(afu, afu_idx, dev);
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if (rc) {
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ocxl_afu_put(afu);
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return rc;
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}
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rc = activate_afu(dev, afu);
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if (rc) {
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deconfigure_afu(afu);
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ocxl_afu_put(afu);
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return rc;
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}
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list_add_tail(&afu->list, &fn->afu_list);
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return 0;
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}
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static void remove_afu(struct ocxl_afu *afu)
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{
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list_del(&afu->list);
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ocxl_context_detach_all(afu);
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deactivate_afu(afu);
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deconfigure_afu(afu);
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ocxl_afu_put(afu); // matches the implicit get in alloc_afu
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}
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static struct ocxl_fn *alloc_function(void)
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{
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struct ocxl_fn *fn;
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fn = kzalloc(sizeof(struct ocxl_fn), GFP_KERNEL);
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if (!fn)
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return NULL;
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INIT_LIST_HEAD(&fn->afu_list);
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INIT_LIST_HEAD(&fn->pasid_list);
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INIT_LIST_HEAD(&fn->actag_list);
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return fn;
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}
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static void free_function(struct ocxl_fn *fn)
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{
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WARN_ON(!list_empty(&fn->afu_list));
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WARN_ON(!list_empty(&fn->pasid_list));
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kfree(fn);
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}
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static void free_function_dev(struct device *dev)
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{
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struct ocxl_fn *fn = container_of(dev, struct ocxl_fn, dev);
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free_function(fn);
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}
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static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev)
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{
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fn->dev.parent = &dev->dev;
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fn->dev.release = free_function_dev;
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return dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev));
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}
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static int assign_function_actag(struct ocxl_fn *fn)
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{
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struct pci_dev *dev = to_pci_dev(fn->dev.parent);
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u16 base, enabled, supported;
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int rc;
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rc = ocxl_config_get_actag_info(dev, &base, &enabled, &supported);
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if (rc)
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return rc;
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fn->actag_base = base;
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fn->actag_enabled = enabled;
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fn->actag_supported = supported;
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ocxl_config_set_actag(dev, fn->config.dvsec_function_pos,
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fn->actag_base, fn->actag_enabled);
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dev_dbg(&fn->dev, "actag range starting at %d, enabled %d\n",
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fn->actag_base, fn->actag_enabled);
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return 0;
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}
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static int set_function_pasid(struct ocxl_fn *fn)
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{
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struct pci_dev *dev = to_pci_dev(fn->dev.parent);
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int rc, desired_count, max_count;
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/* A function may not require any PASID */
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if (fn->config.max_pasid_log < 0)
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return 0;
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rc = ocxl_config_get_pasid_info(dev, &max_count);
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if (rc)
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return rc;
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desired_count = 1 << fn->config.max_pasid_log;
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if (desired_count > max_count) {
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dev_err(&fn->dev,
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"Function requires more PASIDs than is available (%d vs. %d)\n",
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desired_count, max_count);
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return -ENOSPC;
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}
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fn->pasid_base = 0;
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return 0;
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}
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static int configure_function(struct ocxl_fn *fn, struct pci_dev *dev)
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{
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int rc;
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rc = pci_enable_device(dev);
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if (rc) {
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dev_err(&dev->dev, "pci_enable_device failed: %d\n", rc);
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return rc;
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}
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/*
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* Once it has been confirmed to work on our hardware, we
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* should reset the function, to force the adapter to restart
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* from scratch.
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* A function reset would also reset all its AFUs.
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*
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* Some hints for implementation:
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*
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* - there's not status bit to know when the reset is done. We
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* should try reading the config space to know when it's
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* done.
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* - probably something like:
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* Reset
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* wait 100ms
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* issue config read
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* allow device up to 1 sec to return success on config
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* read before declaring it broken
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*
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* Some shared logic on the card (CFG, TLX) won't be reset, so
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* there's no guarantee that it will be enough.
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*/
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rc = ocxl_config_read_function(dev, &fn->config);
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if (rc)
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return rc;
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rc = set_function_device(fn, dev);
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if (rc)
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return rc;
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rc = assign_function_actag(fn);
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if (rc)
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return rc;
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rc = set_function_pasid(fn);
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if (rc)
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return rc;
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rc = ocxl_link_setup(dev, 0, &fn->link);
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if (rc)
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return rc;
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rc = ocxl_config_set_TL(dev, fn->config.dvsec_tl_pos);
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if (rc) {
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ocxl_link_release(dev, fn->link);
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return rc;
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}
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return 0;
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}
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static void deconfigure_function(struct ocxl_fn *fn)
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{
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struct pci_dev *dev = to_pci_dev(fn->dev.parent);
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ocxl_link_release(dev, fn->link);
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pci_disable_device(dev);
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}
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static struct ocxl_fn *init_function(struct pci_dev *dev)
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{
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struct ocxl_fn *fn;
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int rc;
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fn = alloc_function();
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if (!fn)
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return ERR_PTR(-ENOMEM);
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rc = configure_function(fn, dev);
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if (rc) {
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free_function(fn);
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return ERR_PTR(rc);
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}
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rc = device_register(&fn->dev);
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if (rc) {
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deconfigure_function(fn);
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put_device(&fn->dev);
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return ERR_PTR(rc);
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}
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return fn;
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}
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// Device detection & initialisation
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struct ocxl_fn *ocxl_function_open(struct pci_dev *dev)
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{
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int rc, afu_count = 0;
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u8 afu;
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struct ocxl_fn *fn;
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if (!radix_enabled()) {
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dev_err(&dev->dev, "Unsupported memory model (hash)\n");
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return ERR_PTR(-ENODEV);
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}
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fn = init_function(dev);
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if (IS_ERR(fn)) {
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dev_err(&dev->dev, "function init failed: %li\n",
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PTR_ERR(fn));
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return fn;
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}
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for (afu = 0; afu <= fn->config.max_afu_index; afu++) {
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rc = ocxl_config_check_afu_index(dev, &fn->config, afu);
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if (rc > 0) {
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rc = init_afu(dev, fn, afu);
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if (rc) {
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dev_err(&dev->dev,
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"Can't initialize AFU index %d\n", afu);
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continue;
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}
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afu_count++;
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}
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}
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dev_info(&dev->dev, "%d AFU(s) configured\n", afu_count);
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return fn;
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}
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EXPORT_SYMBOL_GPL(ocxl_function_open);
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struct list_head *ocxl_function_afu_list(struct ocxl_fn *fn)
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{
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return &fn->afu_list;
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}
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EXPORT_SYMBOL_GPL(ocxl_function_afu_list);
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struct ocxl_afu *ocxl_function_fetch_afu(struct ocxl_fn *fn, u8 afu_idx)
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{
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struct ocxl_afu *afu;
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list_for_each_entry(afu, &fn->afu_list, list) {
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if (afu->config.idx == afu_idx)
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return afu;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(ocxl_function_fetch_afu);
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const struct ocxl_fn_config *ocxl_function_config(struct ocxl_fn *fn)
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{
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return &fn->config;
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}
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EXPORT_SYMBOL_GPL(ocxl_function_config);
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void ocxl_function_close(struct ocxl_fn *fn)
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{
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struct ocxl_afu *afu, *tmp;
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list_for_each_entry_safe(afu, tmp, &fn->afu_list, list) {
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remove_afu(afu);
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}
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deconfigure_function(fn);
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device_unregister(&fn->dev);
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}
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EXPORT_SYMBOL_GPL(ocxl_function_close);
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// AFU Metadata
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struct ocxl_afu_config *ocxl_afu_config(struct ocxl_afu *afu)
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{
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return &afu->config;
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}
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EXPORT_SYMBOL_GPL(ocxl_afu_config);
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void ocxl_afu_set_private(struct ocxl_afu *afu, void *private)
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{
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afu->private = private;
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}
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EXPORT_SYMBOL_GPL(ocxl_afu_set_private);
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void *ocxl_afu_get_private(struct ocxl_afu *afu)
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{
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if (afu)
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return afu->private;
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return NULL;
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}
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EXPORT_SYMBOL_GPL(ocxl_afu_get_private);
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