508 lines
12 KiB
C
508 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2015 IBM Corp.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include "cxl.h"
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static const __be32 *read_prop_string(const struct device_node *np,
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const char *prop_name)
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{
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const __be32 *prop;
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prop = of_get_property(np, prop_name, NULL);
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if (cxl_verbose && prop)
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pr_info("%s: %s\n", prop_name, (char *) prop);
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return prop;
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}
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static const __be32 *read_prop_dword(const struct device_node *np,
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const char *prop_name, u32 *val)
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{
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const __be32 *prop;
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prop = of_get_property(np, prop_name, NULL);
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if (prop)
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*val = be32_to_cpu(prop[0]);
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if (cxl_verbose && prop)
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pr_info("%s: %#x (%u)\n", prop_name, *val, *val);
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return prop;
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}
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static const __be64 *read_prop64_dword(const struct device_node *np,
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const char *prop_name, u64 *val)
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{
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const __be64 *prop;
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prop = of_get_property(np, prop_name, NULL);
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if (prop)
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*val = be64_to_cpu(prop[0]);
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if (cxl_verbose && prop)
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pr_info("%s: %#llx (%llu)\n", prop_name, *val, *val);
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return prop;
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}
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static int read_handle(struct device_node *np, u64 *handle)
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{
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const __be32 *prop;
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u64 size;
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/* Get address and size of the node */
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prop = of_get_address(np, 0, &size, NULL);
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if (size)
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return -EINVAL;
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/* Helper to read a big number; size is in cells (not bytes) */
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*handle = of_read_number(prop, of_n_addr_cells(np));
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return 0;
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}
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static int read_phys_addr(struct device_node *np, char *prop_name,
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struct cxl_afu *afu)
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{
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int i, len, entry_size, naddr, nsize, type;
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u64 addr, size;
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const __be32 *prop;
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naddr = of_n_addr_cells(np);
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nsize = of_n_size_cells(np);
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prop = of_get_property(np, prop_name, &len);
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if (prop) {
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entry_size = naddr + nsize;
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for (i = 0; i < (len / 4); i += entry_size, prop += entry_size) {
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type = be32_to_cpu(prop[0]);
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addr = of_read_number(prop, naddr);
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size = of_read_number(&prop[naddr], nsize);
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switch (type) {
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case 0: /* unit address */
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afu->guest->handle = addr;
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break;
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case 1: /* p2 area */
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afu->guest->p2n_phys += addr;
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afu->guest->p2n_size = size;
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break;
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case 2: /* problem state area */
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afu->psn_phys += addr;
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afu->adapter->ps_size = size;
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break;
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default:
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pr_err("Invalid address type %d found in %s property of AFU\n",
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type, prop_name);
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return -EINVAL;
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}
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if (cxl_verbose)
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pr_info("%s: %#x %#llx (size %#llx)\n",
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prop_name, type, addr, size);
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}
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}
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return 0;
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}
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static int read_vpd(struct cxl *adapter, struct cxl_afu *afu)
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{
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char vpd[256];
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int rc;
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size_t len = sizeof(vpd);
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memset(vpd, 0, len);
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if (adapter)
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rc = cxl_guest_read_adapter_vpd(adapter, vpd, len);
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else
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rc = cxl_guest_read_afu_vpd(afu, vpd, len);
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if (rc > 0) {
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cxl_dump_debug_buffer(vpd, rc);
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rc = 0;
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}
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return rc;
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}
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int cxl_of_read_afu_handle(struct cxl_afu *afu, struct device_node *afu_np)
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{
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if (read_handle(afu_np, &afu->guest->handle))
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return -EINVAL;
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pr_devel("AFU handle: 0x%.16llx\n", afu->guest->handle);
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return 0;
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}
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int cxl_of_read_afu_properties(struct cxl_afu *afu, struct device_node *np)
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{
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int i, len, rc;
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char *p;
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const __be32 *prop;
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u16 device_id, vendor_id;
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u32 val = 0, class_code;
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/* Properties are read in the same order as listed in PAPR */
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if (cxl_verbose) {
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pr_info("Dump of the 'ibm,coherent-platform-function' node properties:\n");
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prop = of_get_property(np, "compatible", &len);
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i = 0;
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while (i < len) {
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p = (char *) prop + i;
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pr_info("compatible: %s\n", p);
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i += strlen(p) + 1;
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}
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read_prop_string(np, "name");
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}
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rc = read_phys_addr(np, "reg", afu);
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if (rc)
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return rc;
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rc = read_phys_addr(np, "assigned-addresses", afu);
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if (rc)
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return rc;
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if (afu->psn_phys == 0)
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afu->psa = false;
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else
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afu->psa = true;
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if (cxl_verbose) {
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read_prop_string(np, "ibm,loc-code");
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read_prop_string(np, "device_type");
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}
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read_prop_dword(np, "ibm,#processes", &afu->max_procs_virtualised);
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if (cxl_verbose) {
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read_prop_dword(np, "ibm,scratchpad-size", &val);
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read_prop_dword(np, "ibm,programmable", &val);
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read_prop_string(np, "ibm,phandle");
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read_vpd(NULL, afu);
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}
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read_prop_dword(np, "ibm,max-ints-per-process", &afu->guest->max_ints);
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afu->irqs_max = afu->guest->max_ints;
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prop = read_prop_dword(np, "ibm,min-ints-per-process", &afu->pp_irqs);
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if (prop) {
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/* One extra interrupt for the PSL interrupt is already
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* included. Remove it now to keep only AFU interrupts and
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* match the native case.
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*/
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afu->pp_irqs--;
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}
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if (cxl_verbose) {
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read_prop_dword(np, "ibm,max-ints", &val);
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read_prop_dword(np, "ibm,vpd-size", &val);
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}
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read_prop64_dword(np, "ibm,error-buffer-size", &afu->eb_len);
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afu->eb_offset = 0;
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if (cxl_verbose)
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read_prop_dword(np, "ibm,config-record-type", &val);
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read_prop64_dword(np, "ibm,config-record-size", &afu->crs_len);
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afu->crs_offset = 0;
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read_prop_dword(np, "ibm,#config-records", &afu->crs_num);
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if (cxl_verbose) {
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for (i = 0; i < afu->crs_num; i++) {
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rc = cxl_ops->afu_cr_read16(afu, i, PCI_DEVICE_ID,
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&device_id);
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if (!rc)
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pr_info("record %d - device-id: %#x\n",
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i, device_id);
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rc = cxl_ops->afu_cr_read16(afu, i, PCI_VENDOR_ID,
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&vendor_id);
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if (!rc)
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pr_info("record %d - vendor-id: %#x\n",
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i, vendor_id);
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rc = cxl_ops->afu_cr_read32(afu, i, PCI_CLASS_REVISION,
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&class_code);
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if (!rc) {
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class_code >>= 8;
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pr_info("record %d - class-code: %#x\n",
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i, class_code);
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}
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}
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read_prop_dword(np, "ibm,function-number", &val);
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read_prop_dword(np, "ibm,privileged-function", &val);
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read_prop_dword(np, "vendor-id", &val);
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read_prop_dword(np, "device-id", &val);
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read_prop_dword(np, "revision-id", &val);
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read_prop_dword(np, "class-code", &val);
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read_prop_dword(np, "subsystem-vendor-id", &val);
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read_prop_dword(np, "subsystem-id", &val);
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}
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/*
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* if "ibm,process-mmio" doesn't exist then per-process mmio is
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* not supported
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*/
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val = 0;
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prop = read_prop_dword(np, "ibm,process-mmio", &val);
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if (prop && val == 1)
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afu->pp_psa = true;
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else
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afu->pp_psa = false;
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if (cxl_verbose) {
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read_prop_dword(np, "ibm,supports-aur", &val);
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read_prop_dword(np, "ibm,supports-csrp", &val);
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read_prop_dword(np, "ibm,supports-prr", &val);
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}
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prop = read_prop_dword(np, "ibm,function-error-interrupt", &val);
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if (prop)
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afu->serr_hwirq = val;
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pr_devel("AFU handle: %#llx\n", afu->guest->handle);
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pr_devel("p2n_phys: %#llx (size %#llx)\n",
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afu->guest->p2n_phys, afu->guest->p2n_size);
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pr_devel("psn_phys: %#llx (size %#llx)\n",
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afu->psn_phys, afu->adapter->ps_size);
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pr_devel("Max number of processes virtualised=%i\n",
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afu->max_procs_virtualised);
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pr_devel("Per-process irqs min=%i, max=%i\n", afu->pp_irqs,
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afu->irqs_max);
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pr_devel("Slice error interrupt=%#lx\n", afu->serr_hwirq);
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return 0;
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}
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static int read_adapter_irq_config(struct cxl *adapter, struct device_node *np)
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{
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const __be32 *ranges;
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int len, nranges, i;
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struct irq_avail *cur;
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ranges = of_get_property(np, "interrupt-ranges", &len);
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if (ranges == NULL || len < (2 * sizeof(int)))
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return -EINVAL;
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/*
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* encoded array of two cells per entry, each cell encoded as
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* with encode-int
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*/
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nranges = len / (2 * sizeof(int));
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if (nranges == 0 || (nranges * 2 * sizeof(int)) != len)
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return -EINVAL;
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adapter->guest->irq_avail = kcalloc(nranges, sizeof(struct irq_avail),
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GFP_KERNEL);
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if (adapter->guest->irq_avail == NULL)
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return -ENOMEM;
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adapter->guest->irq_base_offset = be32_to_cpu(ranges[0]);
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for (i = 0; i < nranges; i++) {
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cur = &adapter->guest->irq_avail[i];
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cur->offset = be32_to_cpu(ranges[i * 2]);
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cur->range = be32_to_cpu(ranges[i * 2 + 1]);
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cur->bitmap = kcalloc(BITS_TO_LONGS(cur->range),
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sizeof(*cur->bitmap), GFP_KERNEL);
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if (cur->bitmap == NULL)
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goto err;
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if (cur->offset < adapter->guest->irq_base_offset)
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adapter->guest->irq_base_offset = cur->offset;
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if (cxl_verbose)
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pr_info("available IRQ range: %#lx-%#lx (%lu)\n",
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cur->offset, cur->offset + cur->range - 1,
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cur->range);
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}
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adapter->guest->irq_nranges = nranges;
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spin_lock_init(&adapter->guest->irq_alloc_lock);
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return 0;
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err:
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for (i--; i >= 0; i--) {
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cur = &adapter->guest->irq_avail[i];
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kfree(cur->bitmap);
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}
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kfree(adapter->guest->irq_avail);
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adapter->guest->irq_avail = NULL;
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return -ENOMEM;
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}
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int cxl_of_read_adapter_handle(struct cxl *adapter, struct device_node *np)
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{
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if (read_handle(np, &adapter->guest->handle))
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return -EINVAL;
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pr_devel("Adapter handle: 0x%.16llx\n", adapter->guest->handle);
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return 0;
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}
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int cxl_of_read_adapter_properties(struct cxl *adapter, struct device_node *np)
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{
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int rc, len, naddr, i;
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char *p;
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const __be32 *prop;
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u32 val = 0;
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/* Properties are read in the same order as listed in PAPR */
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naddr = of_n_addr_cells(np);
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if (cxl_verbose) {
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pr_info("Dump of the 'ibm,coherent-platform-facility' node properties:\n");
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read_prop_dword(np, "#address-cells", &val);
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read_prop_dword(np, "#size-cells", &val);
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prop = of_get_property(np, "compatible", &len);
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i = 0;
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while (i < len) {
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p = (char *) prop + i;
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pr_info("compatible: %s\n", p);
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i += strlen(p) + 1;
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}
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read_prop_string(np, "name");
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read_prop_string(np, "model");
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prop = of_get_property(np, "reg", NULL);
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if (prop) {
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pr_info("reg: addr:%#llx size:%#x\n",
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of_read_number(prop, naddr),
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be32_to_cpu(prop[naddr]));
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}
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read_prop_string(np, "ibm,loc-code");
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}
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if ((rc = read_adapter_irq_config(adapter, np)))
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return rc;
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if (cxl_verbose) {
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read_prop_string(np, "device_type");
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read_prop_string(np, "ibm,phandle");
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}
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prop = read_prop_dword(np, "ibm,caia-version", &val);
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if (prop) {
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adapter->caia_major = (val & 0xFF00) >> 8;
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adapter->caia_minor = val & 0xFF;
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}
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prop = read_prop_dword(np, "ibm,psl-revision", &val);
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if (prop)
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adapter->psl_rev = val;
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prop = read_prop_string(np, "status");
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if (prop) {
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adapter->guest->status = kasprintf(GFP_KERNEL, "%s", (char *) prop);
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if (adapter->guest->status == NULL)
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return -ENOMEM;
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}
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prop = read_prop_dword(np, "vendor-id", &val);
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if (prop)
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adapter->guest->vendor = val;
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prop = read_prop_dword(np, "device-id", &val);
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if (prop)
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adapter->guest->device = val;
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if (cxl_verbose) {
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read_prop_dword(np, "ibm,privileged-facility", &val);
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read_prop_dword(np, "revision-id", &val);
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read_prop_dword(np, "class-code", &val);
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}
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prop = read_prop_dword(np, "subsystem-vendor-id", &val);
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if (prop)
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adapter->guest->subsystem_vendor = val;
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prop = read_prop_dword(np, "subsystem-id", &val);
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if (prop)
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adapter->guest->subsystem = val;
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if (cxl_verbose)
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read_vpd(adapter, NULL);
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return 0;
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}
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static int cxl_of_remove(struct platform_device *pdev)
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{
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struct cxl *adapter;
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int afu;
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adapter = dev_get_drvdata(&pdev->dev);
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for (afu = 0; afu < adapter->slices; afu++)
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cxl_guest_remove_afu(adapter->afu[afu]);
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cxl_guest_remove_adapter(adapter);
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return 0;
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}
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static void cxl_of_shutdown(struct platform_device *pdev)
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{
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cxl_of_remove(pdev);
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}
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int cxl_of_probe(struct platform_device *pdev)
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{
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struct device_node *np = NULL;
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struct device_node *afu_np = NULL;
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struct cxl *adapter = NULL;
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int ret;
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int slice = 0, slice_ok = 0;
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pr_devel("in %s\n", __func__);
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np = pdev->dev.of_node;
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if (np == NULL)
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return -ENODEV;
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/* init adapter */
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adapter = cxl_guest_init_adapter(np, pdev);
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if (IS_ERR(adapter)) {
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dev_err(&pdev->dev, "guest_init_adapter failed: %li\n", PTR_ERR(adapter));
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return PTR_ERR(adapter);
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}
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/* init afu */
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for_each_child_of_node(np, afu_np) {
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if ((ret = cxl_guest_init_afu(adapter, slice, afu_np)))
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dev_err(&pdev->dev, "AFU %i failed to initialise: %i\n",
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slice, ret);
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else
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slice_ok++;
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slice++;
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}
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if (slice_ok == 0) {
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dev_info(&pdev->dev, "No active AFU");
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adapter->slices = 0;
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}
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return 0;
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}
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static const struct of_device_id cxl_of_match[] = {
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{ .compatible = "ibm,coherent-platform-facility",},
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{},
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};
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MODULE_DEVICE_TABLE(of, cxl_of_match);
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struct platform_driver cxl_of_driver = {
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.driver = {
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.name = "cxl_of",
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.of_match_table = cxl_of_match,
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.owner = THIS_MODULE
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},
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.probe = cxl_of_probe,
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.remove = cxl_of_remove,
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.shutdown = cxl_of_shutdown,
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};
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