Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752740AbbHCHiE (ORCPT ); Mon, 3 Aug 2015 03:38:04 -0400 Received: from e28smtp09.in.ibm.com ([122.248.162.9]:42713 "EHLO e28smtp09.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751937AbbHCHg0 (ORCPT ); Mon, 3 Aug 2015 03:36:26 -0400 X-Helo: d28dlp02.in.ibm.com X-MailFrom: maddy@linux.vnet.ibm.com X-RcptTo: linux-kernel@vger.kernel.org From: Madhavan Srinivasan To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Madhavan Srinivasan , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Anton Blanchard , Sukadev Bhattiprolu , Daniel Axtens , Stephane Eranian Subject: [PATCH v7 4/7] powerpc/powernv: detect supported nest pmus and its events Date: Mon, 3 Aug 2015 13:05:56 +0530 Message-Id: <1438587359-6165-5-git-send-email-maddy@linux.vnet.ibm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1438587359-6165-1-git-send-email-maddy@linux.vnet.ibm.com> References: <1438587359-6165-1-git-send-email-maddy@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15080307-0033-0000-0000-00000710B5FC Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5087 Lines: 193 Parse device tree to detect supported nest pmu units. Traverse through each nest pmu unit folder to find supported events and corresponding unit/scale files (if any). The nest unit event file from Device Tree will contain the offset in the reserved memory region to get the counter data for a given event. Kernel code uses this offset as event configuration value. Device tree parser code also looks for scale/unit in the file name and passes on the file as an event attr for perf tool to use in the post processing. Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Anton Blanchard Cc: Sukadev Bhattiprolu Cc: Daniel Axtens Cc: Stephane Eranian Signed-off-by: Madhavan Srinivasan --- arch/powerpc/perf/nest-pmu.c | 137 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+) diff --git a/arch/powerpc/perf/nest-pmu.c b/arch/powerpc/perf/nest-pmu.c index 48738f9f6426..292fc2b91ed0 100644 --- a/arch/powerpc/perf/nest-pmu.c +++ b/arch/powerpc/perf/nest-pmu.c @@ -11,12 +11,140 @@ #include "nest-pmu.h" static struct perchip_nest_info p8_nest_perchip_info[P8_NEST_MAX_CHIPS]; +static struct nest_pmu *per_nest_pmu_arr[P8_NEST_MAX_PMUS]; + +static int nest_event_info(char *name, struct nest_ima_events *p8_events) +{ + char *buf; + + /* memory for event name */ + buf = kzalloc(P8_NEST_MAX_PMU_NAME_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + strncpy(buf, name, strlen(name)); + p8_events->ev_name = buf; + + /* memory for content */ + buf = kzalloc(P8_NEST_MAX_PMU_NAME_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + p8_events->ev_value = buf; + return 0; +} + +static int nest_event_info_str(struct property *pp, char *name, + struct nest_ima_events *p8_events) +{ + if (nest_event_info(name, p8_events)) + return -ENOMEM; + + if (!pp->value || (strnlen(pp->value, pp->length) == pp->length) || + (pp->length > P8_NEST_MAX_PMU_NAME_LEN)) + return -EINVAL; + + strncpy(p8_events->ev_value, (const char *)pp->value, pp->length); + + return 0; +} + +static int nest_event_info_val(char *name, u32 val, + struct nest_ima_events *p8_events) +{ + if (nest_event_info(name, p8_events)) + return -ENOMEM; + + sprintf(p8_events->ev_value, "event=0x%x", val); + + return 0; +} + +static int nest_pmu_create(struct device_node *dev, int pmu_index) +{ + struct nest_ima_events *p8_events; + struct nest_pmu *pmu_ptr; + struct property *pp; + char *buf, *start; + u32 val; + int idx = 0, ret; + + if (!dev) + return -EINVAL; + + /* memory for nest pmus */ + pmu_ptr = kzalloc(sizeof(struct nest_pmu), GFP_KERNEL); + if (!pmu_ptr) + return -ENOMEM; + + /* Needed for hotplug/migration */ + per_nest_pmu_arr[pmu_index] = pmu_ptr; + + /* memory for nest pmu events */ + p8_events = kzalloc((sizeof(struct nest_ima_events) * + P8_NEST_MAX_EVENTS_SUPPORTED), GFP_KERNEL); + if (!p8_events) + return -ENOMEM; + + /* + * Loop through each property + */ + for_each_property_of_node(dev, pp) { + start = pp->name; + + if (!strcmp(pp->name, "name")) { + if (!pp->value || + (strnlen(pp->value, pp->length) == pp->length) || + (pp->length > P8_NEST_MAX_PMU_NAME_LEN)) + return -EINVAL; + + buf = kzalloc(P8_NEST_MAX_PMU_NAME_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + /* Save the name to register it later */ + sprintf(buf, "Nest_%s", (char *)pp->value); + pmu_ptr->pmu.name = (char *)buf; + continue; + } + + /* Skip these, we don't need it */ + if (!strcmp(pp->name, "phandle") || + !strcmp(pp->name, "device_type") || + !strcmp(pp->name, "linux,phandle")) + continue; + + /* + * Strip the prefix from "unit" and "scale" property name + * since it is only a marker search + */ + if (strncmp(pp->name, "unit.", 5) == 0) { + start += 5; + ret = nest_event_info_str(pp, start, &p8_events[idx]); + } else if (strncmp(pp->name, "scale.", 6) == 0) { + start += 6; + ret = nest_event_info_str(pp, start, &p8_events[idx]); + } else { + of_property_read_u32(dev, pp->name, &val); + ret = nest_event_info_val(start, val, &p8_events[idx]); + } + + if (ret) + return ret; + + /* book keeping */ + idx++; + } + + return 0; +} static int nest_ima_dt_parser(void) { struct device_node *dev; struct perchip_nest_info *p8ni; u32 idx; + int ret; /* * "nest-ima" folder contains two things, @@ -39,6 +167,15 @@ static int nest_ima_dt_parser(void) p8ni->vbase = (u64)phys_to_virt(p8ni->pbase); } + /* Look for supported Nest PMU units */ + idx = 0; + for_each_node_by_type(dev, "nest-ima-unit") { + ret = nest_pmu_create(dev, idx); + if (ret) + return ret; + idx++; + } + return 0; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/