517 lines
12 KiB
C
517 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Dynamic reconfiguration memory support
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*
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* Copyright 2017 IBM Corporation
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*/
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#define pr_fmt(fmt) "drmem: " fmt
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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#include <asm/drmem.h>
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static int n_root_addr_cells, n_root_size_cells;
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static struct drmem_lmb_info __drmem_info;
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struct drmem_lmb_info *drmem_info = &__drmem_info;
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static bool in_drmem_update;
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u64 drmem_lmb_memory_max(void)
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{
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struct drmem_lmb *last_lmb;
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last_lmb = &drmem_info->lmbs[drmem_info->n_lmbs - 1];
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return last_lmb->base_addr + drmem_lmb_size();
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}
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static u32 drmem_lmb_flags(struct drmem_lmb *lmb)
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{
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/*
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* Return the value of the lmb flags field minus the reserved
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* bit used internally for hotplug processing.
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*/
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return lmb->flags & ~DRMEM_LMB_RESERVED;
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}
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static struct property *clone_property(struct property *prop, u32 prop_sz)
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{
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struct property *new_prop;
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new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
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if (!new_prop)
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return NULL;
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new_prop->name = kstrdup(prop->name, GFP_KERNEL);
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new_prop->value = kzalloc(prop_sz, GFP_KERNEL);
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if (!new_prop->name || !new_prop->value) {
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kfree(new_prop->name);
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kfree(new_prop->value);
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kfree(new_prop);
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return NULL;
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}
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new_prop->length = prop_sz;
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#if defined(CONFIG_OF_DYNAMIC)
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of_property_set_flag(new_prop, OF_DYNAMIC);
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#endif
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return new_prop;
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}
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static int drmem_update_dt_v1(struct device_node *memory,
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struct property *prop)
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{
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struct property *new_prop;
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struct of_drconf_cell_v1 *dr_cell;
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struct drmem_lmb *lmb;
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u32 *p;
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new_prop = clone_property(prop, prop->length);
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if (!new_prop)
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return -1;
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p = new_prop->value;
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*p++ = cpu_to_be32(drmem_info->n_lmbs);
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dr_cell = (struct of_drconf_cell_v1 *)p;
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for_each_drmem_lmb(lmb) {
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dr_cell->base_addr = cpu_to_be64(lmb->base_addr);
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dr_cell->drc_index = cpu_to_be32(lmb->drc_index);
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dr_cell->aa_index = cpu_to_be32(lmb->aa_index);
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dr_cell->flags = cpu_to_be32(drmem_lmb_flags(lmb));
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dr_cell++;
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}
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of_update_property(memory, new_prop);
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return 0;
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}
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static void init_drconf_v2_cell(struct of_drconf_cell_v2 *dr_cell,
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struct drmem_lmb *lmb)
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{
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dr_cell->base_addr = cpu_to_be64(lmb->base_addr);
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dr_cell->drc_index = cpu_to_be32(lmb->drc_index);
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dr_cell->aa_index = cpu_to_be32(lmb->aa_index);
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dr_cell->flags = cpu_to_be32(drmem_lmb_flags(lmb));
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}
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static int drmem_update_dt_v2(struct device_node *memory,
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struct property *prop)
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{
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struct property *new_prop;
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struct of_drconf_cell_v2 *dr_cell;
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struct drmem_lmb *lmb, *prev_lmb;
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u32 lmb_sets, prop_sz, seq_lmbs;
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u32 *p;
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/* First pass, determine how many LMB sets are needed. */
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lmb_sets = 0;
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prev_lmb = NULL;
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for_each_drmem_lmb(lmb) {
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if (!prev_lmb) {
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prev_lmb = lmb;
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lmb_sets++;
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continue;
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}
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if (prev_lmb->aa_index != lmb->aa_index ||
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drmem_lmb_flags(prev_lmb) != drmem_lmb_flags(lmb))
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lmb_sets++;
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prev_lmb = lmb;
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}
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prop_sz = lmb_sets * sizeof(*dr_cell) + sizeof(__be32);
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new_prop = clone_property(prop, prop_sz);
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if (!new_prop)
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return -1;
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p = new_prop->value;
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*p++ = cpu_to_be32(lmb_sets);
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dr_cell = (struct of_drconf_cell_v2 *)p;
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/* Second pass, populate the LMB set data */
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prev_lmb = NULL;
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seq_lmbs = 0;
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for_each_drmem_lmb(lmb) {
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if (prev_lmb == NULL) {
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/* Start of first LMB set */
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prev_lmb = lmb;
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init_drconf_v2_cell(dr_cell, lmb);
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seq_lmbs++;
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continue;
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}
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if (prev_lmb->aa_index != lmb->aa_index ||
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drmem_lmb_flags(prev_lmb) != drmem_lmb_flags(lmb)) {
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/* end of one set, start of another */
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dr_cell->seq_lmbs = cpu_to_be32(seq_lmbs);
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dr_cell++;
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init_drconf_v2_cell(dr_cell, lmb);
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seq_lmbs = 1;
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} else {
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seq_lmbs++;
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}
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prev_lmb = lmb;
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}
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/* close out last LMB set */
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dr_cell->seq_lmbs = cpu_to_be32(seq_lmbs);
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of_update_property(memory, new_prop);
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return 0;
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}
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int drmem_update_dt(void)
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{
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struct device_node *memory;
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struct property *prop;
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int rc = -1;
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memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
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if (!memory)
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return -1;
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/*
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* Set in_drmem_update to prevent the notifier callback to process the
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* DT property back since the change is coming from the LMB tree.
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*/
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in_drmem_update = true;
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prop = of_find_property(memory, "ibm,dynamic-memory", NULL);
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if (prop) {
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rc = drmem_update_dt_v1(memory, prop);
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} else {
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prop = of_find_property(memory, "ibm,dynamic-memory-v2", NULL);
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if (prop)
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rc = drmem_update_dt_v2(memory, prop);
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}
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in_drmem_update = false;
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of_node_put(memory);
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return rc;
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}
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static void read_drconf_v1_cell(struct drmem_lmb *lmb,
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const __be32 **prop)
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{
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const __be32 *p = *prop;
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lmb->base_addr = of_read_number(p, n_root_addr_cells);
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p += n_root_addr_cells;
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lmb->drc_index = of_read_number(p++, 1);
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p++; /* skip reserved field */
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lmb->aa_index = of_read_number(p++, 1);
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lmb->flags = of_read_number(p++, 1);
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*prop = p;
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}
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static int
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__walk_drmem_v1_lmbs(const __be32 *prop, const __be32 *usm, void *data,
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int (*func)(struct drmem_lmb *, const __be32 **, void *))
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{
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struct drmem_lmb lmb;
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u32 i, n_lmbs;
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int ret = 0;
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n_lmbs = of_read_number(prop++, 1);
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for (i = 0; i < n_lmbs; i++) {
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read_drconf_v1_cell(&lmb, &prop);
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ret = func(&lmb, &usm, data);
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if (ret)
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break;
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}
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return ret;
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}
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static void read_drconf_v2_cell(struct of_drconf_cell_v2 *dr_cell,
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const __be32 **prop)
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{
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const __be32 *p = *prop;
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dr_cell->seq_lmbs = of_read_number(p++, 1);
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dr_cell->base_addr = of_read_number(p, n_root_addr_cells);
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p += n_root_addr_cells;
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dr_cell->drc_index = of_read_number(p++, 1);
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dr_cell->aa_index = of_read_number(p++, 1);
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dr_cell->flags = of_read_number(p++, 1);
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*prop = p;
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}
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static int
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__walk_drmem_v2_lmbs(const __be32 *prop, const __be32 *usm, void *data,
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int (*func)(struct drmem_lmb *, const __be32 **, void *))
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{
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struct of_drconf_cell_v2 dr_cell;
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struct drmem_lmb lmb;
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u32 i, j, lmb_sets;
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int ret = 0;
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lmb_sets = of_read_number(prop++, 1);
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for (i = 0; i < lmb_sets; i++) {
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read_drconf_v2_cell(&dr_cell, &prop);
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for (j = 0; j < dr_cell.seq_lmbs; j++) {
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lmb.base_addr = dr_cell.base_addr;
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dr_cell.base_addr += drmem_lmb_size();
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lmb.drc_index = dr_cell.drc_index;
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dr_cell.drc_index++;
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lmb.aa_index = dr_cell.aa_index;
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lmb.flags = dr_cell.flags;
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ret = func(&lmb, &usm, data);
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if (ret)
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break;
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}
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}
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return ret;
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}
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#ifdef CONFIG_PPC_PSERIES
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int __init walk_drmem_lmbs_early(unsigned long node, void *data,
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int (*func)(struct drmem_lmb *, const __be32 **, void *))
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{
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const __be32 *prop, *usm;
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int len, ret = -ENODEV;
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prop = of_get_flat_dt_prop(node, "ibm,lmb-size", &len);
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if (!prop || len < dt_root_size_cells * sizeof(__be32))
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return ret;
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/* Get the address & size cells */
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n_root_addr_cells = dt_root_addr_cells;
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n_root_size_cells = dt_root_size_cells;
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drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop);
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usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", &len);
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prop = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &len);
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if (prop) {
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ret = __walk_drmem_v1_lmbs(prop, usm, data, func);
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} else {
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prop = of_get_flat_dt_prop(node, "ibm,dynamic-memory-v2",
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&len);
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if (prop)
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ret = __walk_drmem_v2_lmbs(prop, usm, data, func);
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}
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memblock_dump_all();
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return ret;
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}
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/*
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* Update the LMB associativity index.
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*/
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static int update_lmb(struct drmem_lmb *updated_lmb,
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__maybe_unused const __be32 **usm,
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__maybe_unused void *data)
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{
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struct drmem_lmb *lmb;
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for_each_drmem_lmb(lmb) {
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if (lmb->drc_index != updated_lmb->drc_index)
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continue;
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lmb->aa_index = updated_lmb->aa_index;
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break;
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}
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return 0;
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}
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/*
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* Update the LMB associativity index.
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*
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* This needs to be called when the hypervisor is updating the
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* dynamic-reconfiguration-memory node property.
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*/
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void drmem_update_lmbs(struct property *prop)
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{
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/*
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* Don't update the LMBs if triggered by the update done in
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* drmem_update_dt(), the LMB values have been used to the update the DT
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* property in that case.
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*/
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if (in_drmem_update)
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return;
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if (!strcmp(prop->name, "ibm,dynamic-memory"))
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__walk_drmem_v1_lmbs(prop->value, NULL, NULL, update_lmb);
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else if (!strcmp(prop->name, "ibm,dynamic-memory-v2"))
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__walk_drmem_v2_lmbs(prop->value, NULL, NULL, update_lmb);
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}
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#endif
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static int init_drmem_lmb_size(struct device_node *dn)
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{
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const __be32 *prop;
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int len;
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if (drmem_info->lmb_size)
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return 0;
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prop = of_get_property(dn, "ibm,lmb-size", &len);
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if (!prop || len < n_root_size_cells * sizeof(__be32)) {
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pr_info("Could not determine LMB size\n");
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return -1;
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}
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|
|
drmem_info->lmb_size = of_read_number(prop, n_root_size_cells);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Returns the property linux,drconf-usable-memory if
|
||
|
|
* it exists (the property exists only in kexec/kdump kernels,
|
||
|
|
* added by kexec-tools)
|
||
|
|
*/
|
||
|
|
static const __be32 *of_get_usable_memory(struct device_node *dn)
|
||
|
|
{
|
||
|
|
const __be32 *prop;
|
||
|
|
u32 len;
|
||
|
|
|
||
|
|
prop = of_get_property(dn, "linux,drconf-usable-memory", &len);
|
||
|
|
if (!prop || len < sizeof(unsigned int))
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
return prop;
|
||
|
|
}
|
||
|
|
|
||
|
|
int walk_drmem_lmbs(struct device_node *dn, void *data,
|
||
|
|
int (*func)(struct drmem_lmb *, const __be32 **, void *))
|
||
|
|
{
|
||
|
|
const __be32 *prop, *usm;
|
||
|
|
int ret = -ENODEV;
|
||
|
|
|
||
|
|
if (!of_root)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
/* Get the address & size cells */
|
||
|
|
of_node_get(of_root);
|
||
|
|
n_root_addr_cells = of_n_addr_cells(of_root);
|
||
|
|
n_root_size_cells = of_n_size_cells(of_root);
|
||
|
|
of_node_put(of_root);
|
||
|
|
|
||
|
|
if (init_drmem_lmb_size(dn))
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
usm = of_get_usable_memory(dn);
|
||
|
|
|
||
|
|
prop = of_get_property(dn, "ibm,dynamic-memory", NULL);
|
||
|
|
if (prop) {
|
||
|
|
ret = __walk_drmem_v1_lmbs(prop, usm, data, func);
|
||
|
|
} else {
|
||
|
|
prop = of_get_property(dn, "ibm,dynamic-memory-v2", NULL);
|
||
|
|
if (prop)
|
||
|
|
ret = __walk_drmem_v2_lmbs(prop, usm, data, func);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init init_drmem_v1_lmbs(const __be32 *prop)
|
||
|
|
{
|
||
|
|
struct drmem_lmb *lmb;
|
||
|
|
|
||
|
|
drmem_info->n_lmbs = of_read_number(prop++, 1);
|
||
|
|
if (drmem_info->n_lmbs == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
drmem_info->lmbs = kcalloc(drmem_info->n_lmbs, sizeof(*lmb),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!drmem_info->lmbs)
|
||
|
|
return;
|
||
|
|
|
||
|
|
for_each_drmem_lmb(lmb)
|
||
|
|
read_drconf_v1_cell(lmb, &prop);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init init_drmem_v2_lmbs(const __be32 *prop)
|
||
|
|
{
|
||
|
|
struct drmem_lmb *lmb;
|
||
|
|
struct of_drconf_cell_v2 dr_cell;
|
||
|
|
const __be32 *p;
|
||
|
|
u32 i, j, lmb_sets;
|
||
|
|
int lmb_index;
|
||
|
|
|
||
|
|
lmb_sets = of_read_number(prop++, 1);
|
||
|
|
if (lmb_sets == 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* first pass, calculate the number of LMBs */
|
||
|
|
p = prop;
|
||
|
|
for (i = 0; i < lmb_sets; i++) {
|
||
|
|
read_drconf_v2_cell(&dr_cell, &p);
|
||
|
|
drmem_info->n_lmbs += dr_cell.seq_lmbs;
|
||
|
|
}
|
||
|
|
|
||
|
|
drmem_info->lmbs = kcalloc(drmem_info->n_lmbs, sizeof(*lmb),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!drmem_info->lmbs)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* second pass, read in the LMB information */
|
||
|
|
lmb_index = 0;
|
||
|
|
p = prop;
|
||
|
|
|
||
|
|
for (i = 0; i < lmb_sets; i++) {
|
||
|
|
read_drconf_v2_cell(&dr_cell, &p);
|
||
|
|
|
||
|
|
for (j = 0; j < dr_cell.seq_lmbs; j++) {
|
||
|
|
lmb = &drmem_info->lmbs[lmb_index++];
|
||
|
|
|
||
|
|
lmb->base_addr = dr_cell.base_addr;
|
||
|
|
dr_cell.base_addr += drmem_info->lmb_size;
|
||
|
|
|
||
|
|
lmb->drc_index = dr_cell.drc_index;
|
||
|
|
dr_cell.drc_index++;
|
||
|
|
|
||
|
|
lmb->aa_index = dr_cell.aa_index;
|
||
|
|
lmb->flags = dr_cell.flags;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init drmem_init(void)
|
||
|
|
{
|
||
|
|
struct device_node *dn;
|
||
|
|
const __be32 *prop;
|
||
|
|
|
||
|
|
dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
|
||
|
|
if (!dn) {
|
||
|
|
pr_info("No dynamic reconfiguration memory found\n");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (init_drmem_lmb_size(dn)) {
|
||
|
|
of_node_put(dn);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
prop = of_get_property(dn, "ibm,dynamic-memory", NULL);
|
||
|
|
if (prop) {
|
||
|
|
init_drmem_v1_lmbs(prop);
|
||
|
|
} else {
|
||
|
|
prop = of_get_property(dn, "ibm,dynamic-memory-v2", NULL);
|
||
|
|
if (prop)
|
||
|
|
init_drmem_v2_lmbs(prop);
|
||
|
|
}
|
||
|
|
|
||
|
|
of_node_put(dn);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
late_initcall(drmem_init);
|