powerpc/powernv/vas: Define vas_init() and vas_exit()
Implement vas_init() and vas_exit() functions for a new VAS module. This VAS module is essentially a library for other device drivers and kernel users of the NX coprocessors like NX-842 and NX-GZIP. In the future this will be extended to add support for user space to access the NX coprocessors. VAS is currently only supported with 64K page size. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu
Michael Ellerman
parent
b6622a339e
commit
4dea2d1a92
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@ -0,0 +1,22 @@
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* IBM Powerpc Virtual Accelerator Switchboard (VAS)
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VAS is a hardware mechanism that allows kernel subsystems and user processes
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to directly submit compression and other requests to Nest accelerators (NX)
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or other coprocessors functions.
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Required properties:
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- compatible : should be "ibm,vas".
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- ibm,vas-id : A unique identifier for each instance of VAS in the system
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- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor
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window context start and length, OS/User window context start and length,
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"Paste address" start and length, "Paste window id" start bit and number
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of bits)
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Example:
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vas@6019100000000 {
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compatible = "ibm,vas", "ibm,power9-vas";
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reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>;
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name = "vas";
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ibm,vas-id = <0x1>;
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};
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@ -6429,6 +6429,14 @@ L: netdev@vger.kernel.org
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S: Supported
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F: drivers/net/ethernet/ibm/ibmvnic.*
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IBM Power Virtual Accelerator Switchboard
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M: Sukadev Bhattiprolu
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L: linuxppc-dev@lists.ozlabs.org
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S: Supported
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F: arch/powerpc/platforms/powernv/vas*
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F: arch/powerpc/include/asm/vas.h
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F: arch/powerpc/include/uapi/asm/vas.h
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IBM Power Virtual Ethernet Device Driver
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M: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
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L: netdev@vger.kernel.org
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@ -38,3 +38,17 @@ config PPC_MEMTRACE
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help
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Enabling this option allows for the removal of memory (RAM)
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from the kernel mappings to be used for hardware tracing.
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config PPC_VAS
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bool "IBM Virtual Accelerator Switchboard (VAS)"
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depends on PPC_POWERNV && PPC_64K_PAGES
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default y
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help
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This enables support for IBM Virtual Accelerator Switchboard (VAS).
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VAS allows accelerators in co-processors like NX-GZIP and NX-842
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to be accessible to kernel subsystems and user processes.
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VAS adapters are found in POWER9 based systems.
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If unsure, say N.
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@ -14,3 +14,4 @@ obj-$(CONFIG_TRACEPOINTS) += opal-tracepoints.o
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obj-$(CONFIG_OPAL_PRD) += opal-prd.o
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obj-$(CONFIG_PERF_EVENTS) += opal-imc.o
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obj-$(CONFIG_PPC_MEMTRACE) += memtrace.o
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obj-$(CONFIG_PPC_VAS) += vas.o vas-window.o
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@ -0,0 +1,19 @@
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/*
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* Copyright 2016-17 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include "vas.h"
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/* stub for now */
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int vas_win_close(struct vas_window *window)
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{
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return -1;
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}
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@ -0,0 +1,151 @@
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/*
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* Copyright 2016-17 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "vas: " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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#include <linux/of.h>
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#include "vas.h"
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static DEFINE_MUTEX(vas_mutex);
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static LIST_HEAD(vas_instances);
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static int init_vas_instance(struct platform_device *pdev)
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{
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int rc, vasid;
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struct resource *res;
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struct vas_instance *vinst;
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struct device_node *dn = pdev->dev.of_node;
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rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
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if (rc) {
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pr_err("No ibm,vas-id property for %s?\n", pdev->name);
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return -ENODEV;
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}
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if (pdev->num_resources != 4) {
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pr_err("Unexpected DT configuration for [%s, %d]\n",
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pdev->name, vasid);
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return -ENODEV;
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}
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vinst = kzalloc(sizeof(*vinst), GFP_KERNEL);
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if (!vinst)
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return -ENOMEM;
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INIT_LIST_HEAD(&vinst->node);
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ida_init(&vinst->ida);
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mutex_init(&vinst->mutex);
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vinst->vas_id = vasid;
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vinst->pdev = pdev;
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res = &pdev->resource[0];
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vinst->hvwc_bar_start = res->start;
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res = &pdev->resource[1];
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vinst->uwc_bar_start = res->start;
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res = &pdev->resource[2];
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vinst->paste_base_addr = res->start;
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res = &pdev->resource[3];
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if (res->end > 62) {
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pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end);
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goto free_vinst;
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}
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vinst->paste_win_id_shift = 63 - res->end;
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pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
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"paste_win_id_shift 0x%llx\n", pdev->name, vasid,
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vinst->paste_base_addr, vinst->paste_win_id_shift);
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mutex_lock(&vas_mutex);
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list_add(&vinst->node, &vas_instances);
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mutex_unlock(&vas_mutex);
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dev_set_drvdata(&pdev->dev, vinst);
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return 0;
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free_vinst:
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kfree(vinst);
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return -ENODEV;
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}
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/*
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* Although this is read/used multiple times, it is written to only
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* during initialization.
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*/
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struct vas_instance *find_vas_instance(int vasid)
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{
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struct list_head *ent;
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struct vas_instance *vinst;
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mutex_lock(&vas_mutex);
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list_for_each(ent, &vas_instances) {
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vinst = list_entry(ent, struct vas_instance, node);
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if (vinst->vas_id == vasid) {
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mutex_unlock(&vas_mutex);
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return vinst;
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}
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}
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mutex_unlock(&vas_mutex);
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pr_devel("Instance %d not found\n", vasid);
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return NULL;
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}
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static int vas_probe(struct platform_device *pdev)
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{
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return init_vas_instance(pdev);
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}
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static const struct of_device_id powernv_vas_match[] = {
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{ .compatible = "ibm,vas",},
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{},
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};
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static struct platform_driver vas_driver = {
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.driver = {
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.name = "vas",
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.of_match_table = powernv_vas_match,
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},
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.probe = vas_probe,
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};
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static int __init vas_init(void)
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{
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int found = 0;
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struct device_node *dn;
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platform_driver_register(&vas_driver);
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for_each_compatible_node(dn, NULL, "ibm,vas") {
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of_platform_device_create(dn, NULL, NULL);
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found++;
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}
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if (!found)
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return -ENODEV;
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pr_devel("Found %d instances\n", found);
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return 0;
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}
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device_initcall(vas_init);
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@ -379,4 +379,6 @@ struct vas_winctx {
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enum vas_notify_after_count notify_after_count;
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};
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extern struct vas_instance *find_vas_instance(int vasid);
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#endif /* _VAS_H */
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