diff options
| -rw-r--r-- | Documentation/devicetree/bindings/powerpc/ibm,vas.txt | 22 | ||||
| -rw-r--r-- | MAINTAINERS | 8 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/Kconfig | 14 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/vas-window.c | 19 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/vas.c | 151 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/vas.h | 2 |
7 files changed, 217 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/powerpc/ibm,vas.txt b/Documentation/devicetree/bindings/powerpc/ibm,vas.txt new file mode 100644 index 000000000000..bf11d2faf7b8 --- /dev/null +++ b/Documentation/devicetree/bindings/powerpc/ibm,vas.txt @@ -0,0 +1,22 @@ +* IBM Powerpc Virtual Accelerator Switchboard (VAS) + +VAS is a hardware mechanism that allows kernel subsystems and user processes +to directly submit compression and other requests to Nest accelerators (NX) +or other coprocessors functions. + +Required properties: +- compatible : should be "ibm,vas". +- ibm,vas-id : A unique identifier for each instance of VAS in the system +- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor + window context start and length, OS/User window context start and length, + "Paste address" start and length, "Paste window id" start bit and number + of bits) + +Example: + + vas@6019100000000 { + compatible = "ibm,vas", "ibm,power9-vas"; + reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>; + name = "vas"; + ibm,vas-id = <0x1>; + }; diff --git a/MAINTAINERS b/MAINTAINERS index f66488dfdbc9..5712d9da0c9d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6429,6 +6429,14 @@ L: netdev@vger.kernel.org S: Supported F: drivers/net/ethernet/ibm/ibmvnic.* +IBM Power Virtual Accelerator Switchboard +M: Sukadev Bhattiprolu +L: linuxppc-dev@lists.ozlabs.org +S: Supported +F: arch/powerpc/platforms/powernv/vas* +F: arch/powerpc/include/asm/vas.h +F: arch/powerpc/include/uapi/asm/vas.h + IBM Power Virtual Ethernet Device Driver M: Thomas Falcon <tlfalcon@linux.vnet.ibm.com> L: netdev@vger.kernel.org diff --git a/arch/powerpc/platforms/powernv/Kconfig b/arch/powerpc/platforms/powernv/Kconfig index d7bacb20529c..340cbe263b33 100644 --- a/arch/powerpc/platforms/powernv/Kconfig +++ b/arch/powerpc/platforms/powernv/Kconfig @@ -38,3 +38,17 @@ config PPC_MEMTRACE help Enabling this option allows for the removal of memory (RAM) from the kernel mappings to be used for hardware tracing. + +config PPC_VAS + bool "IBM Virtual Accelerator Switchboard (VAS)" + depends on PPC_POWERNV && PPC_64K_PAGES + default y + help + This enables support for IBM Virtual Accelerator Switchboard (VAS). + + VAS allows accelerators in co-processors like NX-GZIP and NX-842 + to be accessible to kernel subsystems and user processes. + + VAS adapters are found in POWER9 based systems. + + If unsure, say N. diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile index e1b0d4ea683a..37d60f7dd86d 100644 --- a/arch/powerpc/platforms/powernv/Makefile +++ b/arch/powerpc/platforms/powernv/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_TRACEPOINTS) += opal-tracepoints.o obj-$(CONFIG_OPAL_PRD) += opal-prd.o obj-$(CONFIG_PERF_EVENTS) += opal-imc.o obj-$(CONFIG_PPC_MEMTRACE) += memtrace.o +obj-$(CONFIG_PPC_VAS) += vas.o vas-window.o diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c new file mode 100644 index 000000000000..de21acb62f30 --- /dev/null +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -0,0 +1,19 @@ +/* + * Copyright 2016-17 IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/types.h> +#include <linux/mutex.h> + +#include "vas.h" + +/* stub for now */ +int vas_win_close(struct vas_window *window) +{ + return -1; +} diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c new file mode 100644 index 000000000000..565a4878fefa --- /dev/null +++ b/arch/powerpc/platforms/powernv/vas.c @@ -0,0 +1,151 @@ +/* + * Copyright 2016-17 IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#define pr_fmt(fmt) "vas: " fmt + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/of_platform.h> +#include <linux/of_address.h> +#include <linux/of.h> + +#include "vas.h" + +static DEFINE_MUTEX(vas_mutex); +static LIST_HEAD(vas_instances); + +static int init_vas_instance(struct platform_device *pdev) +{ + int rc, vasid; + struct resource *res; + struct vas_instance *vinst; + struct device_node *dn = pdev->dev.of_node; + + rc = of_property_read_u32(dn, "ibm,vas-id", &vasid); + if (rc) { + pr_err("No ibm,vas-id property for %s?\n", pdev->name); + return -ENODEV; + } + + if (pdev->num_resources != 4) { + pr_err("Unexpected DT configuration for [%s, %d]\n", + pdev->name, vasid); + return -ENODEV; + } + + vinst = kzalloc(sizeof(*vinst), GFP_KERNEL); + if (!vinst) + return -ENOMEM; + + INIT_LIST_HEAD(&vinst->node); + ida_init(&vinst->ida); + mutex_init(&vinst->mutex); + vinst->vas_id = vasid; + vinst->pdev = pdev; + + res = &pdev->resource[0]; + vinst->hvwc_bar_start = res->start; + + res = &pdev->resource[1]; + vinst->uwc_bar_start = res->start; + + res = &pdev->resource[2]; + vinst->paste_base_addr = res->start; + + res = &pdev->resource[3]; + if (res->end > 62) { + pr_err("Bad 'paste_win_id_shift' in DT, %llx\n", res->end); + goto free_vinst; + } + + vinst->paste_win_id_shift = 63 - res->end; + + pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, " + "paste_win_id_shift 0x%llx\n", pdev->name, vasid, + vinst->paste_base_addr, vinst->paste_win_id_shift); + + mutex_lock(&vas_mutex); + list_add(&vinst->node, &vas_instances); + mutex_unlock(&vas_mutex); + + dev_set_drvdata(&pdev->dev, vinst); + + return 0; + +free_vinst: + kfree(vinst); + return -ENODEV; + +} + +/* + * Although this is read/used multiple times, it is written to only + * during initialization. + */ +struct vas_instance *find_vas_instance(int vasid) +{ + struct list_head *ent; + struct vas_instance *vinst; + + mutex_lock(&vas_mutex); + list_for_each(ent, &vas_instances) { + vinst = list_entry(ent, struct vas_instance, node); + if (vinst->vas_id == vasid) { + mutex_unlock(&vas_mutex); + return vinst; + } + } + mutex_unlock(&vas_mutex); + + pr_devel("Instance %d not found\n", vasid); + return NULL; +} + +static int vas_probe(struct platform_device *pdev) +{ + return init_vas_instance(pdev); +} + +static const struct of_device_id powernv_vas_match[] = { + { .compatible = "ibm,vas",}, + {}, +}; + +static struct platform_driver vas_driver = { + .driver = { + .name = "vas", + .of_match_table = powernv_vas_match, + }, + .probe = vas_probe, +}; + +static int __init vas_init(void) +{ + int found = 0; + struct device_node *dn; + + platform_driver_register(&vas_driver); + + for_each_compatible_node(dn, NULL, "ibm,vas") { + of_platform_device_create(dn, NULL, NULL); + found++; + } + + if (!found) + return -ENODEV; + + pr_devel("Found %d instances\n", found); + + return 0; +} +device_initcall(vas_init); diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h index abb545f97c77..650805d654ac 100644 --- a/arch/powerpc/platforms/powernv/vas.h +++ b/arch/powerpc/platforms/powernv/vas.h @@ -379,4 +379,6 @@ struct vas_winctx { enum vas_notify_after_count notify_after_count; }; +extern struct vas_instance *find_vas_instance(int vasid); + #endif /* _VAS_H */ |