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Message-Id: <E1OJAzW-0001Wq-ER@eag09.americas.sgi.com>
Date: Mon, 31 May 2010 14:49:42 -0500
From: Cliff Wickman <cpw@....com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...e.hu, hpa@...or.com, gregkh@...e.de
Subject: [PATCH V3] x86, UV: BAU performance and error recovery
Ingo,
This patch updates the patch of the same name, which is in your lastest -tip
b8f7fb1: x86, UV: Improve BAU performance and error recovery
It does not depend on any other patch.
It includes the BAU tunables interfaced through debugfs (instead of /proc)
per Greg Kroah-Hartman's recommendation.
This patch
- corrects several bugs:
o the lack of BAU messaging to blade 0 (an uninitialized field)
o correct message type for a normal shootdown message
o fix to recovery from timed-out s/w acknowledge resources
o calculation of the actual destination timeout so that a 'short' timeout can
be identified
o fix mishandling of non-consecutive hub and socket numbers
o identification of a cpu's socket number
o removal of the check for the h/w stay-busy bug, as under extreme pressure it
cannot be accurately detected
o fall back to IPI-method when extreme pressure makes numalink very slow,
and then resume BAU-method after an interval
- adds BAU broadcasting to the cpu's on the local node
- simplifies the returning of the original cpu bitmap when the BAU attempt
is given up entirely
- adds modification of tuning variables through debugfs
(/sys/kernel/debug/sgi_uv/bau_tunables)
Peter, I weighed the review-ability of a patch for each bug fix and each
addition, versus the ease of tracking a single patch. And decided on the
latter since these bugs and features are only of interest to SGI UV. Hope
that is reasonable.
Diffed against 2.6.34 -tip (Sheep on Meth)
Signed-off-by: Cliff Wickman <cpw@....com>
---
arch/x86/include/asm/uv/uv_bau.h | 306 +++++--
arch/x86/kernel/tlb_uv.c | 1586 +++++++++++++++++++++++++++++----------
2 files changed, 1422 insertions(+), 470 deletions(-)
Index: 100524.linux.2.6.34/arch/x86/include/asm/uv/uv_bau.h
===================================================================
--- 100524.linux.2.6.34.orig/arch/x86/include/asm/uv/uv_bau.h
+++ 100524.linux.2.6.34/arch/x86/include/asm/uv/uv_bau.h
@@ -27,13 +27,15 @@
* set 2 is at BASE + 2*512, set 3 at BASE + 3*512, and so on.
*
* We will use 31 sets, one for sending BAU messages from each of the 32
- * cpu's on the node.
+ * cpu's on the uvhub.
*
* TLB shootdown will use the first of the 8 descriptors of each set.
* Each of the descriptors is 64 bytes in size (8*64 = 512 bytes in a set).
*/
#define UV_ITEMS_PER_DESCRIPTOR 8
+/* the 'throttle' to prevent the hardware stay-busy bug */
+#define MAX_BAU_CONCURRENT 3
#define UV_CPUS_PER_ACT_STATUS 32
#define UV_ACT_STATUS_MASK 0x3
#define UV_ACT_STATUS_SIZE 2
@@ -44,7 +46,26 @@
#define UV_DESC_BASE_PNODE_SHIFT 49
#define UV_PAYLOADQ_PNODE_SHIFT 49
#define UV_PTC_BASENAME "sgi_uv/ptc_statistics"
+#define UV_BAU_BASENAME "sgi_uv/bau_tunables"
+#define UV_BAU_TUNABLES_DIR "sgi_uv"
+#define UV_BAU_TUNABLES_FILE "bau_tunables"
+#define WHITESPACE " \t\n"
#define uv_physnodeaddr(x) ((__pa((unsigned long)(x)) & uv_mmask))
+#define UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT 15
+#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT 16
+#define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x0000000009UL
+/* [19:16] SOFT_ACK timeout period 19: 1 is urgency 7 17:16 1 is multiplier */
+#define BAU_MISC_CONTROL_MULT_MASK 3
+
+#define UVH_AGING_PRESCALE_SEL 0x000000b000UL
+/* [30:28] URGENCY_7 an index into a table of times */
+#define BAU_URGENCY_7_SHIFT 28
+#define BAU_URGENCY_7_MASK 7
+
+#define UVH_TRANSACTION_TIMEOUT 0x000000b200UL
+/* [45:40] BAU - BAU transaction timeout select - a multiplier */
+#define BAU_TRANS_SHIFT 40
+#define BAU_TRANS_MASK 0x3f
/*
* bits in UVH_LB_BAU_SB_ACTIVATION_STATUS_0/1
@@ -55,15 +76,26 @@
#define DESC_STATUS_SOURCE_TIMEOUT 3
/*
- * source side thresholds at which message retries print a warning
+ * delay for 'plugged' timeout retries, in microseconds
*/
-#define SOURCE_TIMEOUT_LIMIT 20
-#define DESTINATION_TIMEOUT_LIMIT 20
+#define PLUGGED_DELAY 10
+
+/*
+ * threshholds at which to use IPI to free resources
+ */
+/* after this # consecutive 'plugged' timeouts, use IPI to release resources */
+#define PLUGSB4RESET 100
+/* after this many consecutive timeouts, use IPI to release resources */
+#define TIMEOUTSB4RESET 1
+/* at this number uses of IPI to release resources, giveup the request */
+#define IPI_RESET_LIMIT 1
+/* after this # consecutive successes, bump up the throttle if it was lowered */
+#define COMPLETE_THRESHOLD 5
/*
* number of entries in the destination side payload queue
*/
-#define DEST_Q_SIZE 17
+#define DEST_Q_SIZE 20
/*
* number of destination side software ack resources
*/
@@ -72,9 +104,17 @@
/*
* completion statuses for sending a TLB flush message
*/
-#define FLUSH_RETRY 1
-#define FLUSH_GIVEUP 2
-#define FLUSH_COMPLETE 3
+#define FLUSH_RETRY_PLUGGED 1
+#define FLUSH_RETRY_TIMEOUT 2
+#define FLUSH_GIVEUP 3
+#define FLUSH_COMPLETE 4
+
+/*
+ * tuning the action when the numalink network is extremely delayed
+ */
+#define CONGESTED_RESPONSE_US 1000 /* 'long' response time, in microseconds */
+#define CONGESTED_REPS 10 /* long delays averaged over this many broadcasts */
+#define CONGESTED_PERIOD 30 /* time for the bau to be disabled, in seconds */
/*
* Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor)
@@ -86,14 +126,14 @@
* 'base_dest_nodeid' field of the header corresponds to the
* destination nodeID associated with that specified bit.
*/
-struct bau_target_nodemask {
- unsigned long bits[BITS_TO_LONGS(256)];
+struct bau_target_uvhubmask {
+ unsigned long bits[BITS_TO_LONGS(UV_DISTRIBUTION_SIZE)];
};
/*
- * mask of cpu's on a node
+ * mask of cpu's on a uvhub
* (during initialization we need to check that unsigned long has
- * enough bits for max. cpu's per node)
+ * enough bits for max. cpu's per uvhub)
*/
struct bau_local_cpumask {
unsigned long bits;
@@ -135,8 +175,8 @@ struct bau_msg_payload {
struct bau_msg_header {
unsigned int dest_subnodeid:6; /* must be 0x10, for the LB */
/* bits 5:0 */
- unsigned int base_dest_nodeid:15; /* nasid>>1 (pnode) of */
- /* bits 20:6 */ /* first bit in node_map */
+ unsigned int base_dest_nodeid:15; /* nasid (pnode<<1) of */
+ /* bits 20:6 */ /* first bit in uvhub map */
unsigned int command:8; /* message type */
/* bits 28:21 */
/* 0x38: SN3net EndPoint Message */
@@ -146,26 +186,38 @@ struct bau_msg_header {
unsigned int rsvd_2:9; /* must be zero */
/* bits 40:32 */
/* Suppl_A is 56-41 */
- unsigned int payload_2a:8;/* becomes byte 16 of msg */
- /* bits 48:41 */ /* not currently using */
- unsigned int payload_2b:8;/* becomes byte 17 of msg */
- /* bits 56:49 */ /* not currently using */
+ unsigned int sequence:16;/* message sequence number */
+ /* bits 56:41 */ /* becomes bytes 16-17 of msg */
/* Address field (96:57) is never used as an
address (these are address bits 42:3) */
+
unsigned int rsvd_3:1; /* must be zero */
/* bit 57 */
/* address bits 27:4 are payload */
- /* these 24 bits become bytes 12-14 of msg */
+ /* these next 24 (58-81) bits become bytes 12-14 of msg */
+
+ /* bits 65:58 land in byte 12 */
unsigned int replied_to:1;/* sent as 0 by the source to byte 12 */
/* bit 58 */
-
- unsigned int payload_1a:5;/* not currently used */
- /* bits 63:59 */
- unsigned int payload_1b:8;/* not currently used */
- /* bits 71:64 */
- unsigned int payload_1c:8;/* not currently used */
- /* bits 79:72 */
- unsigned int payload_1d:2;/* not currently used */
+ unsigned int msg_type:3; /* software type of the message*/
+ /* bits 61:59 */
+ unsigned int canceled:1; /* message canceled, resource to be freed*/
+ /* bit 62 */
+ unsigned int payload_1a:1;/* not currently used */
+ /* bit 63 */
+ unsigned int payload_1b:2;/* not currently used */
+ /* bits 65:64 */
+
+ /* bits 73:66 land in byte 13 */
+ unsigned int payload_1ca:6;/* not currently used */
+ /* bits 71:66 */
+ unsigned int payload_1c:2;/* not currently used */
+ /* bits 73:72 */
+
+ /* bits 81:74 land in byte 14 */
+ unsigned int payload_1d:6;/* not currently used */
+ /* bits 79:74 */
+ unsigned int payload_1e:2;/* not currently used */
/* bits 81:80 */
unsigned int rsvd_4:7; /* must be zero */
@@ -178,7 +230,7 @@ struct bau_msg_header {
/* bits 95:90 */
unsigned int rsvd_6:5; /* must be zero */
/* bits 100:96 */
- unsigned int int_both:1;/* if 1, interrupt both sockets on the blade */
+ unsigned int int_both:1;/* if 1, interrupt both sockets on the uvhub */
/* bit 101*/
unsigned int fairness:3;/* usually zero */
/* bits 104:102 */
@@ -191,13 +243,18 @@ struct bau_msg_header {
/* bits 127:107 */
};
+/* see msg_type: */
+#define MSG_NOOP 0
+#define MSG_REGULAR 1
+#define MSG_RETRY 2
+
/*
* The activation descriptor:
* The format of the message to send, plus all accompanying control
* Should be 64 bytes
*/
struct bau_desc {
- struct bau_target_nodemask distribution;
+ struct bau_target_uvhubmask distribution;
/*
* message template, consisting of header and payload:
*/
@@ -237,19 +294,25 @@ struct bau_payload_queue_entry {
unsigned short acknowledge_count; /* filled in by destination */
/* 16 bits, bytes 10-11 */
- unsigned short replied_to:1; /* sent as 0 by the source */
- /* 1 bit */
- unsigned short unused1:7; /* not currently using */
- /* 7 bits: byte 12) */
-
- unsigned char unused2[2]; /* not currently using */
- /* bytes 13-14 */
+ /* these next 3 bytes come from bits 58-81 of the message header */
+ unsigned short replied_to:1; /* sent as 0 by the source */
+ unsigned short msg_type:3; /* software message type */
+ unsigned short canceled:1; /* sent as 0 by the source */
+ unsigned short unused1:3; /* not currently using */
+ /* byte 12 */
+
+ unsigned char unused2a; /* not currently using */
+ /* byte 13 */
+ unsigned char unused2; /* not currently using */
+ /* byte 14 */
unsigned char sw_ack_vector; /* filled in by the hardware */
/* byte 15 (bits 127:120) */
- unsigned char unused4[3]; /* not currently using bytes 17-19 */
- /* bytes 17-19 */
+ unsigned short sequence; /* message sequence number */
+ /* bytes 16-17 */
+ unsigned char unused4[2]; /* not currently using bytes 18-19 */
+ /* bytes 18-19 */
int number_of_cpus; /* filled in at destination */
/* 32 bits, bytes 20-23 (aligned) */
@@ -258,64 +321,126 @@ struct bau_payload_queue_entry {
/* bytes 24-31 */
};
-/*
- * one for every slot in the destination payload queue
- */
-struct bau_msg_status {
- struct bau_local_cpumask seen_by; /* map of cpu's */
+struct msg_desc {
+ struct bau_payload_queue_entry *msg;
+ int msg_slot;
+ int sw_ack_slot;
+ struct bau_payload_queue_entry *va_queue_first;
+ struct bau_payload_queue_entry *va_queue_last;
+};
+
+struct reset_args {
+ int sender;
};
/*
- * one for every slot in the destination software ack resources
+ * This structure is allocated per_cpu for UV TLB shootdown statistics.
*/
-struct bau_sw_ack_status {
- struct bau_payload_queue_entry *msg; /* associated message */
- int watcher; /* cpu monitoring, or -1 */
+struct ptc_stats {
+ /* sender statistics */
+ unsigned long s_giveup; /* number of fall backs to IPI-style flushes */
+ unsigned long s_requestor; /* number of shootdown requests */
+ unsigned long s_stimeout; /* source side timeouts */
+ unsigned long s_dtimeout; /* destination side timeouts */
+ unsigned long s_time; /* time spent in sending side */
+ unsigned long s_retriesok; /* successful retries */
+ unsigned long s_ntargcpu; /* total number of cpu's targeted */
+ unsigned long s_ntargself; /* times the sending cpu was targeted */
+ unsigned long s_ntarglocals; /* targets of cpus on the local blade */
+ unsigned long s_ntargremotes; /* targets of cpus on remote blades */
+ unsigned long s_ntarglocaluvhub; /* targets of the local hub */
+ unsigned long s_ntargremoteuvhub; /* remotes hubs targeted */
+ unsigned long s_ntarguvhub; /* total number of uvhubs targeted */
+ unsigned long s_ntarguvhub16; /* number of times target hubs >= 16*/
+ unsigned long s_ntarguvhub8; /* number of times target hubs >= 8 */
+ unsigned long s_ntarguvhub4; /* number of times target hubs >= 4 */
+ unsigned long s_ntarguvhub2; /* number of times target hubs >= 2 */
+ unsigned long s_ntarguvhub1; /* number of times target hubs == 1 */
+ unsigned long s_resets_plug; /* ipi-style resets from plug state */
+ unsigned long s_resets_timeout; /* ipi-style resets from timeouts */
+ unsigned long s_busy; /* status stayed busy past s/w timer */
+ unsigned long s_throttles; /* waits in throttle */
+ unsigned long s_retry_messages; /* retry broadcasts */
+ unsigned long s_bau_reenabled; /* for bau enable/disable */
+ unsigned long s_bau_disabled; /* for bau enable/disable */
+ /* destination statistics */
+ unsigned long d_alltlb; /* times all tlb's on this cpu were flushed */
+ unsigned long d_onetlb; /* times just one tlb on this cpu was flushed */
+ unsigned long d_multmsg; /* interrupts with multiple messages */
+ unsigned long d_nomsg; /* interrupts with no message */
+ unsigned long d_time; /* time spent on destination side */
+ unsigned long d_requestee; /* number of messages processed */
+ unsigned long d_retries; /* number of retry messages processed */
+ unsigned long d_canceled; /* number of messages canceled by retries */
+ unsigned long d_nocanceled; /* retries that found nothing to cancel */
+ unsigned long d_resets; /* number of ipi-style requests processed */
+ unsigned long d_rcanceled; /* number of messages canceled by resets */
};
/*
- * one on every node and per-cpu; to locate the software tables
+ * one per-cpu; to locate the software tables
*/
struct bau_control {
struct bau_desc *descriptor_base;
- struct bau_payload_queue_entry *bau_msg_head;
struct bau_payload_queue_entry *va_queue_first;
struct bau_payload_queue_entry *va_queue_last;
- struct bau_msg_status *msg_statuses;
- int *watching; /* pointer to array */
-};
-
-/*
- * This structure is allocated per_cpu for UV TLB shootdown statistics.
- */
-struct ptc_stats {
- unsigned long ptc_i; /* number of IPI-style flushes */
- unsigned long requestor; /* number of nodes this cpu sent to */
- unsigned long requestee; /* times cpu was remotely requested */
- unsigned long alltlb; /* times all tlb's on this cpu were flushed */
- unsigned long onetlb; /* times just one tlb on this cpu was flushed */
- unsigned long s_retry; /* retries on source side timeouts */
- unsigned long d_retry; /* retries on destination side timeouts */
- unsigned long sflush; /* cycles spent in uv_flush_tlb_others */
- unsigned long dflush; /* cycles spent on destination side */
- unsigned long retriesok; /* successes on retries */
- unsigned long nomsg; /* interrupts with no message */
- unsigned long multmsg; /* interrupts with multiple messages */
- unsigned long ntargeted;/* nodes targeted */
+ struct bau_payload_queue_entry *bau_msg_head;
+ struct bau_control *uvhub_master;
+ struct bau_control *socket_master;
+ struct ptc_stats *statp;
+ unsigned long timeout_interval;
+ unsigned long set_bau_on_time;
+ atomic_t active_descriptor_count;
+ int plugged_tries;
+ int timeout_tries;
+ int ipi_attempts;
+ int conseccompletes;
+ int baudisabled;
+ int set_bau_off;
+ short cpu;
+ short uvhub_cpu;
+ short uvhub;
+ short cpus_in_socket;
+ short cpus_in_uvhub;
+ unsigned short message_number;
+ unsigned short uvhub_quiesce;
+ short socket_acknowledge_count[DEST_Q_SIZE];
+ cycles_t send_message;
+ spinlock_t uvhub_lock;
+ spinlock_t queue_lock;
+ /* tunables */
+ int max_bau_concurrent;
+ int max_bau_concurrent_constant;
+ int plugged_delay;
+ int plugsb4reset;
+ int timeoutsb4reset;
+ int ipi_reset_limit;
+ int complete_threshold;
+ int congested_response_us;
+ int congested_reps;
+ int congested_period;
+ cycles_t period_time;
+ long period_requests;
};
-static inline int bau_node_isset(int node, struct bau_target_nodemask *dstp)
+static inline int bau_uvhub_isset(int uvhub, struct bau_target_uvhubmask *dstp)
{
- return constant_test_bit(node, &dstp->bits[0]);
+ return constant_test_bit(uvhub, &dstp->bits[0]);
}
-static inline void bau_node_set(int node, struct bau_target_nodemask *dstp)
+static inline void bau_uvhub_set(int uvhub, struct bau_target_uvhubmask *dstp)
{
- __set_bit(node, &dstp->bits[0]);
+ __set_bit(uvhub, &dstp->bits[0]);
}
-static inline void bau_nodes_clear(struct bau_target_nodemask *dstp, int nbits)
+static inline void bau_uvhubs_clear(struct bau_target_uvhubmask *dstp,
+ int nbits)
{
bitmap_zero(&dstp->bits[0], nbits);
}
+static inline int bau_uvhub_weight(struct bau_target_uvhubmask *dstp)
+{
+ return bitmap_weight((unsigned long *)&dstp->bits[0],
+ UV_DISTRIBUTION_SIZE);
+}
static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
{
@@ -328,4 +453,35 @@ static inline void bau_cpubits_clear(str
extern void uv_bau_message_intr1(void);
extern void uv_bau_timeout_intr1(void);
+struct atomic_short {
+ short counter;
+};
+
+/**
+ * atomic_read_short - read a short atomic variable
+ * @v: pointer of type atomic_short
+ *
+ * Atomically reads the value of @v.
+ */
+static inline int atomic_read_short(const struct atomic_short *v)
+{
+ return v->counter;
+}
+
+/**
+ * atomic_add_short_return - add and return a short int
+ * @i: short value to add
+ * @v: pointer of type atomic_short
+ *
+ * Atomically adds @i to @v and returns @i + @v
+ */
+static inline int atomic_add_short_return(short i, struct atomic_short *v)
+{
+ short __i = i;
+ asm volatile(LOCK_PREFIX "xaddw %0, %1"
+ : "+r" (i), "+m" (v->counter)
+ : : "memory");
+ return i + __i;
+}
+
#endif /* _ASM_X86_UV_UV_BAU_H */
Index: 100524.linux.2.6.34/arch/x86/kernel/tlb_uv.c
===================================================================
--- 100524.linux.2.6.34.orig/arch/x86/kernel/tlb_uv.c
+++ 100524.linux.2.6.34/arch/x86/kernel/tlb_uv.c
@@ -1,15 +1,15 @@
/*
* SGI UltraViolet TLB flush routines.
*
- * (c) 2008 Cliff Wickman <cpw@....com>, SGI.
+ * (c) 2008-2010 Cliff Wickman <cpw@....com>, SGI.
*
* This code is released under the GNU General Public License version 2 or
* later.
*/
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
+#include <linux/debugfs.h>
#include <linux/kernel.h>
-#include <linux/slab.h>
#include <asm/mmu_context.h>
#include <asm/uv/uv.h>
@@ -20,42 +20,81 @@
#include <asm/idle.h>
#include <asm/tsc.h>
#include <asm/irq_vectors.h>
+#include <asm/timer.h>
-static struct bau_control **uv_bau_table_bases __read_mostly;
-static int uv_bau_retry_limit __read_mostly;
+/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
+static int timeout_base_ns[] = {
+ 20,
+ 160,
+ 1280,
+ 10240,
+ 81920,
+ 655360,
+ 5242880,
+ 167772160
+};
+static int timeout_us;
+static int nobau;
+static int baudisabled;
+static spinlock_t disable_lock;
+static cycles_t congested_cycles;
+
+/* tunables: */
+static int max_bau_concurrent = MAX_BAU_CONCURRENT;
+static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT;
+static int plugged_delay = PLUGGED_DELAY;
+static int plugsb4reset = PLUGSB4RESET;
+static int timeoutsb4reset = TIMEOUTSB4RESET;
+static int ipi_reset_limit = IPI_RESET_LIMIT;
+static int complete_threshold = COMPLETE_THRESHOLD;
+static int congested_response_us = CONGESTED_RESPONSE_US;
+static int congested_reps = CONGESTED_REPS;
+static int congested_period = CONGESTED_PERIOD;
+static struct dentry *tunables_dir;
+static struct dentry *tunables_file;
-/* base pnode in this partition */
-static int uv_partition_base_pnode __read_mostly;
+static int __init setup_nobau(char *arg)
+{
+ nobau = 1;
+ return 0;
+}
+early_param("nobau", setup_nobau);
-static unsigned long uv_mmask __read_mostly;
+/* base pnode in this partition */
+static int uv_partition_base_pnode __read_mostly;
+/* position of pnode (which is nasid>>1): */
+static int uv_nshift __read_mostly;
+static unsigned long uv_mmask __read_mostly;
static DEFINE_PER_CPU(struct ptc_stats, ptcstats);
static DEFINE_PER_CPU(struct bau_control, bau_control);
+static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask);
/*
- * Determine the first node on a blade.
+ * Determine the first node on a uvhub. 'Nodes' are used for kernel
+ * memory allocation.
*/
-static int __init blade_to_first_node(int blade)
+static int __init uvhub_to_first_node(int uvhub)
{
int node, b;
for_each_online_node(node) {
b = uv_node_to_blade_id(node);
- if (blade == b)
+ if (uvhub == b)
return node;
}
- return -1; /* shouldn't happen */
+ return -1;
}
/*
- * Determine the apicid of the first cpu on a blade.
+ * Determine the apicid of the first cpu on a uvhub.
*/
-static int __init blade_to_first_apicid(int blade)
+static int __init uvhub_to_first_apicid(int uvhub)
{
int cpu;
for_each_present_cpu(cpu)
- if (blade == uv_cpu_to_blade_id(cpu))
+ if (uvhub == uv_cpu_to_blade_id(cpu))
return per_cpu(x86_cpu_to_apicid, cpu);
return -1;
}
@@ -68,195 +107,432 @@ static int __init blade_to_first_apicid(
* clear of the Timeout bit (as well) will free the resource. No reply will
* be sent (the hardware will only do one reply per message).
*/
-static void uv_reply_to_message(int resource,
- struct bau_payload_queue_entry *msg,
- struct bau_msg_status *msp)
+static inline void uv_reply_to_message(struct msg_desc *mdp,
+ struct bau_control *bcp)
{
unsigned long dw;
+ struct bau_payload_queue_entry *msg;
- dw = (1 << (resource + UV_SW_ACK_NPENDING)) | (1 << resource);
+ msg = mdp->msg;
+ if (!msg->canceled) {
+ dw = (msg->sw_ack_vector << UV_SW_ACK_NPENDING) |
+ msg->sw_ack_vector;
+ uv_write_local_mmr(
+ UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw);
+ }
msg->replied_to = 1;
msg->sw_ack_vector = 0;
- if (msp)
- msp->seen_by.bits = 0;
- uv_write_local_mmr(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw);
}
/*
- * Do all the things a cpu should do for a TLB shootdown message.
- * Other cpu's may come here at the same time for this message.
+ * Process the receipt of a RETRY message
*/
-static void uv_bau_process_message(struct bau_payload_queue_entry *msg,
- int msg_slot, int sw_ack_slot)
+static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
+ struct bau_control *bcp)
{
- unsigned long this_cpu_mask;
- struct bau_msg_status *msp;
- int cpu;
+ int i;
+ int cancel_count = 0;
+ int slot2;
+ unsigned long msg_res;
+ unsigned long mmr = 0;
+ struct bau_payload_queue_entry *msg;
+ struct bau_payload_queue_entry *msg2;
+ struct ptc_stats *stat;
- msp = __get_cpu_var(bau_control).msg_statuses + msg_slot;
- cpu = uv_blade_processor_id();
- msg->number_of_cpus =
- uv_blade_nr_online_cpus(uv_node_to_blade_id(numa_node_id()));
- this_cpu_mask = 1UL << cpu;
- if (msp->seen_by.bits & this_cpu_mask)
- return;
- atomic_or_long(&msp->seen_by.bits, this_cpu_mask);
+ msg = mdp->msg;
+ stat = bcp->statp;
+ stat->d_retries++;
+ /*
+ * cancel any message from msg+1 to the retry itself
+ */
+ for (msg2 = msg+1, i = 0; i < DEST_Q_SIZE; msg2++, i++) {
+ if (msg2 > mdp->va_queue_last)
+ msg2 = mdp->va_queue_first;
+ if (msg2 == msg)
+ break;
+
+ /* same conditions for cancellation as uv_do_reset */
+ if ((msg2->replied_to == 0) && (msg2->canceled == 0) &&
+ (msg2->sw_ack_vector) && ((msg2->sw_ack_vector &
+ msg->sw_ack_vector) == 0) &&
+ (msg2->sending_cpu == msg->sending_cpu) &&
+ (msg2->msg_type != MSG_NOOP)) {
+ slot2 = msg2 - mdp->va_queue_first;
+ mmr = uv_read_local_mmr
+ (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
+ msg_res = msg2->sw_ack_vector;
+ /*
+ * This is a message retry; clear the resources held
+ * by the previous message only if they timed out.
+ * If it has not timed out we have an unexpected
+ * situation to report.
+ */
+ if (mmr & (msg_res << UV_SW_ACK_NPENDING)) {
+ /*
+ * is the resource timed out?
+ * make everyone ignore the cancelled message.
+ */
+ msg2->canceled = 1;
+ stat->d_canceled++;
+ cancel_count++;
+ uv_write_local_mmr(
+ UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
+ (msg_res << UV_SW_ACK_NPENDING) |
+ msg_res);
+ }
+ }
+ }
+ if (!cancel_count)
+ stat->d_nocanceled++;
+}
- if (msg->replied_to == 1)
- return;
+/*
+ * Do all the things a cpu should do for a TLB shootdown message.
+ * Other cpu's may come here at the same time for this message.
+ */
+static void uv_bau_process_message(struct msg_desc *mdp,
+ struct bau_control *bcp)
+{
+ int msg_ack_count;
+ short socket_ack_count = 0;
+ struct ptc_stats *stat;
+ struct bau_payload_queue_entry *msg;
+ struct bau_control *smaster = bcp->socket_master;
+ /*
+ * This must be a normal message, or retry of a normal message
+ */
+ msg = mdp->msg;
+ stat = bcp->statp;
if (msg->address == TLB_FLUSH_ALL) {
local_flush_tlb();
- __get_cpu_var(ptcstats).alltlb++;
+ stat->d_alltlb++;
} else {
__flush_tlb_one(msg->address);
- __get_cpu_var(ptcstats).onetlb++;
+ stat->d_onetlb++;
}
+ stat->d_requestee++;
- __get_cpu_var(ptcstats).requestee++;
+ /*
+ * One cpu on each uvhub has the additional job on a RETRY
+ * of releasing the resource held by the message that is
+ * being retried. That message is identified by sending
+ * cpu number.
+ */
+ if (msg->msg_type == MSG_RETRY && bcp == bcp->uvhub_master)
+ uv_bau_process_retry_msg(mdp, bcp);
+
+ /*
+ * This is a sw_ack message, so we have to reply to it.
+ * Count each responding cpu on the socket. This avoids
+ * pinging the count's cache line back and forth between
+ * the sockets.
+ */
+ socket_ack_count = atomic_add_short_return(1, (struct atomic_short *)
+ &smaster->socket_acknowledge_count[mdp->msg_slot]);
+ if (socket_ack_count == bcp->cpus_in_socket) {
+ /*
+ * Both sockets dump their completed count total into
+ * the message's count.
+ */
+ smaster->socket_acknowledge_count[mdp->msg_slot] = 0;
+ msg_ack_count = atomic_add_short_return(socket_ack_count,
+ (struct atomic_short *)&msg->acknowledge_count);
+
+ if (msg_ack_count == bcp->cpus_in_uvhub) {
+ /*
+ * All cpus in uvhub saw it; reply
+ */
+ uv_reply_to_message(mdp, bcp);
+ }
+ }
- atomic_inc_short(&msg->acknowledge_count);
- if (msg->number_of_cpus == msg->acknowledge_count)
- uv_reply_to_message(sw_ack_slot, msg, msp);
+ return;
}
/*
- * Examine the payload queue on one distribution node to see
- * which messages have not been seen, and which cpu(s) have not seen them.
+ * Determine the first cpu on a uvhub.
+ */
+static int uvhub_to_first_cpu(int uvhub)
+{
+ int cpu;
+ for_each_present_cpu(cpu)
+ if (uvhub == uv_cpu_to_blade_id(cpu))
+ return cpu;
+ return -1;
+}
+
+/*
+ * Last resort when we get a large number of destination timeouts is
+ * to clear resources held by a given cpu.
+ * Do this with IPI so that all messages in the BAU message queue
+ * can be identified by their nonzero sw_ack_vector field.
*
- * Returns the number of cpu's that have not responded.
+ * This is entered for a single cpu on the uvhub.
+ * The sender want's this uvhub to free a specific message's
+ * sw_ack resources.
*/
-static int uv_examine_destination(struct bau_control *bau_tablesp, int sender)
+static void
+uv_do_reset(void *ptr)
{
- struct bau_payload_queue_entry *msg;
- struct bau_msg_status *msp;
- int count = 0;
int i;
- int j;
+ int slot;
+ int count = 0;
+ unsigned long mmr;
+ unsigned long msg_res;
+ struct bau_control *bcp;
+ struct reset_args *rap;
+ struct bau_payload_queue_entry *msg;
+ struct ptc_stats *stat;
- for (msg = bau_tablesp->va_queue_first, i = 0; i < DEST_Q_SIZE;
- msg++, i++) {
- if ((msg->sending_cpu == sender) && (!msg->replied_to)) {
- msp = bau_tablesp->msg_statuses + i;
- printk(KERN_DEBUG
- "blade %d: address:%#lx %d of %d, not cpu(s): ",
- i, msg->address, msg->acknowledge_count,
- msg->number_of_cpus);
- for (j = 0; j < msg->number_of_cpus; j++) {
- if (!((1L << j) & msp->seen_by.bits)) {
- count++;
- printk("%d ", j);
- }
+ bcp = &per_cpu(bau_control, smp_processor_id());
+ rap = (struct reset_args *)ptr;
+ stat = bcp->statp;
+ stat->d_resets++;
+
+ /*
+ * We're looking for the given sender, and
+ * will free its sw_ack resource.
+ * If all cpu's finally responded after the timeout, its
+ * message 'replied_to' was set.
+ */
+ for (msg = bcp->va_queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) {
+ /* uv_do_reset: same conditions for cancellation as
+ uv_bau_process_retry_msg() */
+ if ((msg->replied_to == 0) &&
+ (msg->canceled == 0) &&
+ (msg->sending_cpu == rap->sender) &&
+ (msg->sw_ack_vector) &&
+ (msg->msg_type != MSG_NOOP)) {
+ /*
+ * make everyone else ignore this message
+ */
+ msg->canceled = 1;
+ slot = msg - bcp->va_queue_first;
+ count++;
+ /*
+ * only reset the resource if it is still pending
+ */
+ mmr = uv_read_local_mmr
+ (UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
+ msg_res = msg->sw_ack_vector;
+ if (mmr & msg_res) {
+ stat->d_rcanceled++;
+ uv_write_local_mmr(
+ UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
+ (msg_res << UV_SW_ACK_NPENDING) |
+ msg_res);
}
- printk("\n");
}
}
- return count;
+ return;
}
/*
- * Examine the payload queue on all the distribution nodes to see
- * which messages have not been seen, and which cpu(s) have not seen them.
- *
- * Returns the number of cpu's that have not responded.
+ * Use IPI to get all target uvhubs to release resources held by
+ * a given sending cpu number.
*/
-static int uv_examine_destinations(struct bau_target_nodemask *distribution)
+static void uv_reset_with_ipi(struct bau_target_uvhubmask *distribution,
+ int sender)
{
- int sender;
- int i;
- int count = 0;
+ int uvhub;
+ int cpu;
+ cpumask_t mask;
+ struct reset_args reset_args;
+
+ reset_args.sender = sender;
- sender = smp_processor_id();
- for (i = 0; i < sizeof(struct bau_target_nodemask) * BITSPERBYTE; i++) {
- if (!bau_node_isset(i, distribution))
+ cpus_clear(mask);
+ /* find a single cpu for each uvhub in this distribution mask */
+ for (uvhub = 0;
+ uvhub < sizeof(struct bau_target_uvhubmask) * BITSPERBYTE;
+ uvhub++) {
+ if (!bau_uvhub_isset(uvhub, distribution))
continue;
- count += uv_examine_destination(uv_bau_table_bases[i], sender);
+ /* find a cpu for this uvhub */
+ cpu = uvhub_to_first_cpu(uvhub);
+ cpu_set(cpu, mask);
}
- return count;
+ /* IPI all cpus; Preemption is already disabled */
+ smp_call_function_many(&mask, uv_do_reset, (void *)&reset_args, 1);
+ return;
+}
+
+static inline unsigned long
+cycles_2_us(unsigned long long cyc)
+{
+ unsigned long long ns;
+ unsigned long us;
+ ns = (cyc * per_cpu(cyc2ns, smp_processor_id()))
+ >> CYC2NS_SCALE_FACTOR;
+ us = ns / 1000;
+ return us;
}
/*
- * wait for completion of a broadcast message
- *
- * return COMPLETE, RETRY or GIVEUP
+ * wait for all cpus on this hub to finish their sends and go quiet
+ * leaves uvhub_quiesce set so that no new broadcasts are started by
+ * bau_flush_send_and_wait()
+ */
+static inline void
+quiesce_local_uvhub(struct bau_control *hmaster)
+{
+ atomic_add_short_return(1, (struct atomic_short *)
+ &hmaster->uvhub_quiesce);
+}
+
+/*
+ * mark this quiet-requestor as done
+ */
+static inline void
+end_uvhub_quiesce(struct bau_control *hmaster)
+{
+ atomic_add_short_return(-1, (struct atomic_short *)
+ &hmaster->uvhub_quiesce);
+}
+
+/*
+ * Wait for completion of a broadcast software ack message
+ * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
*/
static int uv_wait_completion(struct bau_desc *bau_desc,
- unsigned long mmr_offset, int right_shift)
+ unsigned long mmr_offset, int right_shift, int this_cpu,
+ struct bau_control *bcp, struct bau_control *smaster, long try)
{
- int exams = 0;
- long destination_timeouts = 0;
- long source_timeouts = 0;
unsigned long descriptor_status;
+ cycles_t ttime;
+ struct ptc_stats *stat = bcp->statp;
+ struct bau_control *hmaster;
+ hmaster = bcp->uvhub_master;
+
+ /* spin on the status MMR, waiting for it to go idle */
while ((descriptor_status = (((unsigned long)
uv_read_local_mmr(mmr_offset) >>
right_shift) & UV_ACT_STATUS_MASK)) !=
DESC_STATUS_IDLE) {
- if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) {
- source_timeouts++;
- if (source_timeouts > SOURCE_TIMEOUT_LIMIT)
- source_timeouts = 0;
- __get_cpu_var(ptcstats).s_retry++;
- return FLUSH_RETRY;
- }
/*
- * spin here looking for progress at the destinations
+ * Our software ack messages may be blocked because there are
+ * no swack resources available. As long as none of them
+ * has timed out hardware will NACK our message and its
+ * state will stay IDLE.
*/
- if (descriptor_status == DESC_STATUS_DESTINATION_TIMEOUT) {
- destination_timeouts++;
- if (destination_timeouts > DESTINATION_TIMEOUT_LIMIT) {
- /*
- * returns number of cpus not responding
- */
- if (uv_examine_destinations
- (&bau_desc->distribution) == 0) {
- __get_cpu_var(ptcstats).d_retry++;
- return FLUSH_RETRY;
- }
- exams++;
- if (exams >= uv_bau_retry_limit) {
- printk(KERN_DEBUG
- "uv_flush_tlb_others");
- printk("giving up on cpu %d\n",
- smp_processor_id());
- return FLUSH_GIVEUP;
- }
- /*
- * delays can hang the simulator
- udelay(1000);
- */
- destination_timeouts = 0;
+ if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) {
+ stat->s_stimeout++;
+ return FLUSH_GIVEUP;
+ } else if (descriptor_status ==
+ DESC_STATUS_DESTINATION_TIMEOUT) {
+ stat->s_dtimeout++;
+ ttime = get_cycles();
+
+ /*
+ * Our retries may be blocked by all destination
+ * swack resources being consumed, and a timeout
+ * pending. In that case hardware returns the
+ * ERROR that looks like a destination timeout.
+ */
+ if (cycles_2_us(ttime - bcp->send_message) <
+ timeout_us) {
+ bcp->conseccompletes = 0;
+ return FLUSH_RETRY_PLUGGED;
}
+
+ bcp->conseccompletes = 0;
+ return FLUSH_RETRY_TIMEOUT;
+ } else {
+ /*
+ * descriptor_status is still BUSY
+ */
+ cpu_relax();
}
- cpu_relax();
}
+ bcp->conseccompletes++;
return FLUSH_COMPLETE;
}
+static inline cycles_t
+sec_2_cycles(unsigned long sec)
+{
+ unsigned long ns;
+ cycles_t cyc;
+
+ ns = sec * 1000000000;
+ cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
+ return cyc;
+}
+
+/*
+ * conditionally add 1 to *v, unless *v is >= u
+ * return 0 if we cannot add 1 to *v because it is >= u
+ * return 1 if we can add 1 to *v because it is < u
+ * the add is atomic
+ *
+ * This is close to atomic_add_unless(), but this allows the 'u' value
+ * to be lowered below the current 'v'. atomic_add_unless can only stop
+ * on equal.
+ */
+static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
+{
+ spin_lock(lock);
+ if (atomic_read(v) >= u) {
+ spin_unlock(lock);
+ return 0;
+ }
+ atomic_inc(v);
+ spin_unlock(lock);
+ return 1;
+}
+
/**
* uv_flush_send_and_wait
*
- * Send a broadcast and wait for a broadcast message to complete.
+ * Send a broadcast and wait for it to complete.
*
- * The flush_mask contains the cpus the broadcast was sent to.
+ * The flush_mask contains the cpus the broadcast is to be sent to including
+ * cpus that are on the local uvhub.
*
- * Returns NULL if all remote flushing was done. The mask is zeroed.
- * Returns @flush_mask if some remote flushing remains to be done. The
- * mask will have some bits still set.
+ * Returns 0 if all flushing represented in the mask was done.
+ * Returns 1 if it gives up entirely and the original cpu mask is to be
+ * returned to the kernel.
*/
-const struct cpumask *uv_flush_send_and_wait(int cpu, int this_pnode,
- struct bau_desc *bau_desc,
- struct cpumask *flush_mask)
+int uv_flush_send_and_wait(struct bau_desc *bau_desc,
+ struct cpumask *flush_mask, struct bau_control *bcp)
{
- int completion_status = 0;
int right_shift;
- int tries = 0;
- int pnode;
- int bit;
+ int completion_status = 0;
+ int seq_number = 0;
+ long try = 0;
+ int cpu = bcp->uvhub_cpu;
+ int tcpu;
+ int this_cpu = bcp->cpu;
unsigned long mmr_offset;
unsigned long index;
cycles_t time1;
cycles_t time2;
+ cycles_t elapsed;
+ cycles_t local_congested_cycles = congested_cycles;
+ struct ptc_stats *stat = bcp->statp;
+ struct bau_control *smaster = bcp->socket_master;
+ struct bau_control *hmaster = bcp->uvhub_master;
+ struct bau_control *tbcp;
+
+ /*
+ * Spin here while there are hmaster->max_bau_concurrent or more active
+ * descriptors. This is the per-uvhub 'throttle'.
+ */
+ if (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
+ &hmaster->active_descriptor_count,
+ hmaster->max_bau_concurrent)) {
+ stat->s_throttles++;
+ do {
+ cpu_relax();
+ } while (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
+ &hmaster->active_descriptor_count,
+ hmaster->max_bau_concurrent));
+ }
+
+ while (hmaster->uvhub_quiesce)
+ cpu_relax();
if (cpu < UV_CPUS_PER_ACT_STATUS) {
mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
@@ -268,44 +544,147 @@ const struct cpumask *uv_flush_send_and_
}
time1 = get_cycles();
do {
- tries++;
+ /*
+ * Every message from any given cpu gets a unique message
+ * sequence number. But retries use that same number.
+ * Our message may have timed out at the destination because
+ * all sw-ack resources are in use and there is a timeout
+ * pending there. In that case, our last send never got
+ * placed into the queue and we need to persist until it
+ * does.
+ *
+ * Make any retry a type MSG_RETRY so that the destination will
+ * free any resource held by a previous message from this cpu.
+ */
+ if (try == 0) {
+ bau_desc->header.msg_type = MSG_REGULAR;
+ seq_number = bcp->message_number++;
+ } else {
+ bau_desc->header.msg_type = MSG_RETRY;
+ stat->s_retry_messages++;
+ }
+ bau_desc->header.sequence = seq_number;
index = (1UL << UVH_LB_BAU_SB_ACTIVATION_CONTROL_PUSH_SHFT) |
- cpu;
+ bcp->uvhub_cpu;
+ bcp->send_message = get_cycles();
+
uv_write_local_mmr(UVH_LB_BAU_SB_ACTIVATION_CONTROL, index);
+
+ try++;
completion_status = uv_wait_completion(bau_desc, mmr_offset,
- right_shift);
- } while (completion_status == FLUSH_RETRY);
+ right_shift, this_cpu, bcp, smaster, try);
+
+ if (completion_status == FLUSH_RETRY_PLUGGED) {
+ /*
+ * Our retries may be blocked by all destination swack
+ * resources being consumed, and a timeout pending. In
+ * that case hardware immediately returns the ERROR
+ * that looks like a destination timeout.
+ */
+ udelay(bcp->plugged_delay);
+ bcp->plugged_tries++;
+ if (bcp->plugged_tries >= bcp->plugsb4reset) {
+ bcp->plugged_tries = 0;
+ quiesce_local_uvhub(hmaster);
+ spin_lock(&hmaster->queue_lock);
+ uv_reset_with_ipi(&bau_desc->distribution,
+ this_cpu);
+ spin_unlock(&hmaster->queue_lock);
+ end_uvhub_quiesce(hmaster);
+ bcp->ipi_attempts++;
+ stat->s_resets_plug++;
+ }
+ } else if (completion_status == FLUSH_RETRY_TIMEOUT) {
+ hmaster->max_bau_concurrent = 1;
+ bcp->timeout_tries++;
+ if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
+ bcp->timeout_tries = 0;
+ quiesce_local_uvhub(hmaster);
+ spin_lock(&hmaster->queue_lock);
+ uv_reset_with_ipi(&bau_desc->distribution,
+ this_cpu);
+ spin_unlock(&hmaster->queue_lock);
+ end_uvhub_quiesce(hmaster);
+ bcp->ipi_attempts++;
+ stat->s_resets_timeout++;
+ }
+ }
+ if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
+ bcp->ipi_attempts = 0;
+ completion_status = FLUSH_GIVEUP;
+ break;
+ }
+ cpu_relax();
+ } while ((completion_status == FLUSH_RETRY_PLUGGED) ||
+ (completion_status == FLUSH_RETRY_TIMEOUT));
time2 = get_cycles();
- __get_cpu_var(ptcstats).sflush += (time2 - time1);
- if (tries > 1)
- __get_cpu_var(ptcstats).retriesok++;
- if (completion_status == FLUSH_GIVEUP) {
+ bcp->plugged_tries = 0;
+ bcp->timeout_tries = 0;
+
+ if ((completion_status == FLUSH_COMPLETE) &&
+ (bcp->conseccompletes > bcp->complete_threshold) &&
+ (hmaster->max_bau_concurrent <
+ hmaster->max_bau_concurrent_constant))
+ hmaster->max_bau_concurrent++;
+
+ /*
+ * hold any cpu not timing out here; no other cpu currently held by
+ * the 'throttle' should enter the activation code
+ */
+ while (hmaster->uvhub_quiesce)
+ cpu_relax();
+ atomic_dec(&hmaster->active_descriptor_count);
+
+ /* guard against cycles wrap */
+ if (time2 > time1) {
+ elapsed = time2 - time1;
+ stat->s_time += elapsed;
+ /* check for a sustained long, non-timeout request times */
+ if ((completion_status == FLUSH_COMPLETE) && (try == 1)) {
+ bcp->period_requests++;
+ bcp->period_time += elapsed;
+ if ((elapsed > local_congested_cycles) &&
+ (bcp->period_requests > bcp->congested_reps)) {
+ /* let only one cpu do this disabling */
+ spin_lock(&disable_lock);
+ if (!baudisabled && bcp->period_requests &&
+ ((bcp->period_time / bcp->period_requests) >
+ local_congested_cycles)) {
+ /* it becomes this cpu's job to turn
+ on the use of the BAU again */
+ baudisabled = 1;
+ bcp->set_bau_off = 1;
+ bcp->set_bau_on_time = get_cycles() +
+ sec_2_cycles(bcp->congested_period);
+ stat->s_bau_disabled++;
+ for_each_present_cpu(tcpu) {
+ tbcp = &per_cpu(bau_control,
+ tcpu);
+ tbcp->baudisabled = 1;
+ }
+ }
+ spin_unlock(&disable_lock);
+ }
+ }
+ } else
+ stat->s_requestor--; /* don't count this one */
+ if (completion_status == FLUSH_COMPLETE && try > 1)
+ stat->s_retriesok++;
+ else if (completion_status == FLUSH_GIVEUP) {
/*
* Cause the caller to do an IPI-style TLB shootdown on
- * the cpu's, all of which are still in the mask.
+ * the target cpu's using the original mask.
*/
- __get_cpu_var(ptcstats).ptc_i++;
- return flush_mask;
+ stat->s_giveup++;
+ return 1;
}
-
/*
- * Success, so clear the remote cpu's from the mask so we don't
- * use the IPI method of shootdown on them.
+ * Success
*/
- for_each_cpu(bit, flush_mask) {
- pnode = uv_cpu_to_pnode(bit);
- if (pnode == this_pnode)
- continue;
- cpumask_clear_cpu(bit, flush_mask);
- }
- if (!cpumask_empty(flush_mask))
- return flush_mask;
- return NULL;
+ return 0;
}
-static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask);
-
/**
* uv_flush_tlb_others - globally purge translation cache of a virtual
* address or all TLB's
@@ -322,8 +701,8 @@ static DEFINE_PER_CPU(cpumask_var_t, uv_
* The caller has derived the cpumask from the mm_struct. This function
* is called only if there are bits set in the mask. (e.g. flush_tlb_page())
*
- * The cpumask is converted into a nodemask of the nodes containing
- * the cpus.
+ * The cpumask is converted into a uvhubmask of the uvhubs containing
+ * those cpus.
*
* Note that this function should be called with preemption disabled.
*
@@ -335,52 +714,100 @@ const struct cpumask *uv_flush_tlb_other
struct mm_struct *mm,
unsigned long va, unsigned int cpu)
{
- struct cpumask *flush_mask = __get_cpu_var(uv_flush_tlb_mask);
- int i;
- int bit;
- int pnode;
- int uv_cpu;
- int this_pnode;
+ int tcpu;
+ int uvhub;
int locals = 0;
+ int remotes = 0;
+ int hubs = 0;
struct bau_desc *bau_desc;
+ struct cpumask *flush_mask;
+ struct ptc_stats *stat;
+ struct bau_control *bcp;
+ struct bau_control *tbcp;
- cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu));
+ bcp = &per_cpu(bau_control, cpu);
+ stat = bcp->statp;
- uv_cpu = uv_blade_processor_id();
- this_pnode = uv_hub_info->pnode;
- bau_desc = __get_cpu_var(bau_control).descriptor_base;
- bau_desc += UV_ITEMS_PER_DESCRIPTOR * uv_cpu;
-
- bau_nodes_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
-
- i = 0;
- for_each_cpu(bit, flush_mask) {
- pnode = uv_cpu_to_pnode(bit);
- BUG_ON(pnode > (UV_DISTRIBUTION_SIZE - 1));
- if (pnode == this_pnode) {
- locals++;
- continue;
+ /* bau was disabled due to slow response */
+ if (bcp->baudisabled) {
+ /* the cpu that disabled it must re-enable it */
+ if (bcp->set_bau_off) {
+ if (get_cycles() >= bcp->set_bau_on_time) {
+ stat->s_bau_reenabled++;
+ baudisabled = 0;
+ for_each_present_cpu(tcpu) {
+ tbcp = &per_cpu(bau_control, tcpu);
+ tbcp->baudisabled = 0;
+ tbcp->period_requests = 0;
+ tbcp->period_time = 0;
+ }
+ }
}
- bau_node_set(pnode - uv_partition_base_pnode,
- &bau_desc->distribution);
- i++;
+ return cpumask;
}
- if (i == 0) {
- /*
- * no off_node flushing; return status for local node
- */
- if (locals)
- return flush_mask;
+
+ /*
+ * Each sending cpu has a per-cpu mask which it fills from the caller's
+ * cpu mask. All cpus are converted to uvhubs and copied to the
+ * activation descriptor.
+ */
+ flush_mask = (struct cpumask *)per_cpu(uv_flush_tlb_mask, cpu);
+ /* don't actually do a shootdown of the local cpu */
+ cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu));
+ if (cpu_isset(cpu, *cpumask))
+ stat->s_ntargself++;
+
+ bau_desc = bcp->descriptor_base;
+ bau_desc += UV_ITEMS_PER_DESCRIPTOR * bcp->uvhub_cpu;
+ bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
+
+ /* cpu statistics */
+ for_each_cpu(tcpu, flush_mask) {
+ uvhub = uv_cpu_to_blade_id(tcpu);
+ bau_uvhub_set(uvhub, &bau_desc->distribution);
+ if (uvhub == bcp->uvhub)
+ locals++;
else
- return NULL;
+ remotes++;
}
- __get_cpu_var(ptcstats).requestor++;
- __get_cpu_var(ptcstats).ntargeted += i;
+ if ((locals + remotes) == 0)
+ return NULL;
+ stat->s_requestor++;
+ stat->s_ntargcpu += remotes + locals;
+ stat->s_ntargremotes += remotes;
+ stat->s_ntarglocals += locals;
+ remotes = bau_uvhub_weight(&bau_desc->distribution);
+
+ /* uvhub statistics */
+ hubs = bau_uvhub_weight(&bau_desc->distribution);
+ if (locals) {
+ stat->s_ntarglocaluvhub++;
+ stat->s_ntargremoteuvhub += (hubs - 1);
+ } else
+ stat->s_ntargremoteuvhub += hubs;
+ stat->s_ntarguvhub += hubs;
+ if (hubs >= 16)
+ stat->s_ntarguvhub16++;
+ else if (hubs >= 8)
+ stat->s_ntarguvhub8++;
+ else if (hubs >= 4)
+ stat->s_ntarguvhub4++;
+ else if (hubs >= 2)
+ stat->s_ntarguvhub2++;
+ else
+ stat->s_ntarguvhub1++;
bau_desc->payload.address = va;
bau_desc->payload.sending_cpu = cpu;
- return uv_flush_send_and_wait(uv_cpu, this_pnode, bau_desc, flush_mask);
+ /*
+ * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
+ * or 1 if it gave up and the original cpumask should be returned.
+ */
+ if (!uv_flush_send_and_wait(bau_desc, flush_mask, bcp))
+ return NULL;
+ else
+ return cpumask;
}
/*
@@ -389,87 +816,70 @@ const struct cpumask *uv_flush_tlb_other
*
* We received a broadcast assist message.
*
- * Interrupts may have been disabled; this interrupt could represent
+ * Interrupts are disabled; this interrupt could represent
* the receipt of several messages.
*
- * All cores/threads on this node get this interrupt.
- * The last one to see it does the s/w ack.
+ * All cores/threads on this hub get this interrupt.
+ * The last one to see it does the software ack.
* (the resource will not be freed until noninterruptable cpus see this
- * interrupt; hardware will timeout the s/w ack and reply ERROR)
+ * interrupt; hardware may timeout the s/w ack and reply ERROR)
*/
void uv_bau_message_interrupt(struct pt_regs *regs)
{
- struct bau_payload_queue_entry *va_queue_first;
- struct bau_payload_queue_entry *va_queue_last;
- struct bau_payload_queue_entry *msg;
- struct pt_regs *old_regs = set_irq_regs(regs);
- cycles_t time1;
- cycles_t time2;
- int msg_slot;
- int sw_ack_slot;
- int fw;
int count = 0;
- unsigned long local_pnode;
-
- ack_APIC_irq();
- exit_idle();
- irq_enter();
-
- time1 = get_cycles();
-
- local_pnode = uv_blade_to_pnode(uv_numa_blade_id());
-
- va_queue_first = __get_cpu_var(bau_control).va_queue_first;
- va_queue_last = __get_cpu_var(bau_control).va_queue_last;
+ cycles_t time_start;
+ struct bau_payload_queue_entry *msg;
+ struct bau_control *bcp;
+ struct ptc_stats *stat;
+ struct msg_desc msgdesc;
- msg = __get_cpu_var(bau_control).bau_msg_head;
+ time_start = get_cycles();
+ bcp = &per_cpu(bau_control, smp_processor_id());
+ stat = bcp->statp;
+ msgdesc.va_queue_first = bcp->va_queue_first;
+ msgdesc.va_queue_last = bcp->va_queue_last;
+ msg = bcp->bau_msg_head;
while (msg->sw_ack_vector) {
count++;
- fw = msg->sw_ack_vector;
- msg_slot = msg - va_queue_first;
- sw_ack_slot = ffs(fw) - 1;
-
- uv_bau_process_message(msg, msg_slot, sw_ack_slot);
-
+ msgdesc.msg_slot = msg - msgdesc.va_queue_first;
+ msgdesc.sw_ack_slot = ffs(msg->sw_ack_vector) - 1;
+ msgdesc.msg = msg;
+ uv_bau_process_message(&msgdesc, bcp);
msg++;
- if (msg > va_queue_last)
- msg = va_queue_first;
- __get_cpu_var(bau_control).bau_msg_head = msg;
+ if (msg > msgdesc.va_queue_last)
+ msg = msgdesc.va_queue_first;
+ bcp->bau_msg_head = msg;
}
+ stat->d_time += (get_cycles() - time_start);
if (!count)
- __get_cpu_var(ptcstats).nomsg++;
+ stat->d_nomsg++;
else if (count > 1)
- __get_cpu_var(ptcstats).multmsg++;
-
- time2 = get_cycles();
- __get_cpu_var(ptcstats).dflush += (time2 - time1);
-
- irq_exit();
- set_irq_regs(old_regs);
+ stat->d_multmsg++;
+ ack_APIC_irq();
}
/*
* uv_enable_timeouts
*
- * Each target blade (i.e. blades that have cpu's) needs to have
+ * Each target uvhub (i.e. a uvhub that has no cpu's) needs to have
* shootdown message timeouts enabled. The timeout does not cause
* an interrupt, but causes an error message to be returned to
* the sender.
*/
static void uv_enable_timeouts(void)
{
- int blade;
- int nblades;
+ int uvhub;
+ int nuvhubs;
int pnode;
unsigned long mmr_image;
- nblades = uv_num_possible_blades();
+ nuvhubs = uv_num_possible_blades();
- for (blade = 0; blade < nblades; blade++) {
- if (!uv_blade_nr_possible_cpus(blade))
+ for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
+ if (!uv_blade_nr_possible_cpus(uvhub))
continue;
- pnode = uv_blade_to_pnode(blade);
+ pnode = uv_blade_to_pnode(uvhub);
mmr_image =
uv_read_global_mmr64(pnode, UVH_LB_BAU_MISC_CONTROL);
/*
@@ -479,16 +889,16 @@ static void uv_enable_timeouts(void)
* To program the period, the SOFT_ACK_MODE must be off.
*/
mmr_image &= ~((unsigned long)1 <<
- UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT);
+ UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
/*
* Set the 4-bit period.
*/
mmr_image &= ~((unsigned long)0xf <<
- UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT);
+ UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
mmr_image |= (UV_INTD_SOFT_ACK_TIMEOUT_PERIOD <<
- UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT);
+ UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
/*
@@ -497,7 +907,7 @@ static void uv_enable_timeouts(void)
* indicated in bits 2:0 (7 causes all of them to timeout).
*/
mmr_image |= ((unsigned long)1 <<
- UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT);
+ UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
uv_write_global_mmr64
(pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
}
@@ -522,9 +932,20 @@ static void uv_ptc_seq_stop(struct seq_f
{
}
+static inline unsigned long long
+microsec_2_cycles(unsigned long microsec)
+{
+ unsigned long ns;
+ unsigned long long cyc;
+
+ ns = microsec * 1000;
+ cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
+ return cyc;
+}
+
/*
- * Display the statistics thru /proc
- * data points to the cpu number
+ * Display the statistics thru /proc.
+ * 'data' points to the cpu number
*/
static int uv_ptc_seq_show(struct seq_file *file, void *data)
{
@@ -535,80 +956,315 @@ static int uv_ptc_seq_show(struct seq_fi
if (!cpu) {
seq_printf(file,
- "# cpu requestor requestee one all sretry dretry ptc_i ");
+ "# cpu sent stime self locals remotes ncpus localhub ");
+ seq_printf(file,
+ "remotehub numuvhubs numuvhubs16 numuvhubs8 ");
+ seq_printf(file,
+ "numuvhubs4 numuvhubs2 numuvhubs1 dto ");
+ seq_printf(file,
+ "retries rok resetp resett giveup sto bz throt ");
+ seq_printf(file,
+ "sw_ack recv rtime all ");
+ seq_printf(file,
+ "one mult none retry canc nocan reset rcan ");
seq_printf(file,
- "sw_ack sflush dflush sok dnomsg dmult starget\n");
+ "disable enable\n");
}
if (cpu < num_possible_cpus() && cpu_online(cpu)) {
stat = &per_cpu(ptcstats, cpu);
- seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld ",
- cpu, stat->requestor,
- stat->requestee, stat->onetlb, stat->alltlb,
- stat->s_retry, stat->d_retry, stat->ptc_i);
- seq_printf(file, "%lx %ld %ld %ld %ld %ld %ld\n",
+ /* source side statistics */
+ seq_printf(file,
+ "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
+ cpu, stat->s_requestor, cycles_2_us(stat->s_time),
+ stat->s_ntargself, stat->s_ntarglocals,
+ stat->s_ntargremotes, stat->s_ntargcpu,
+ stat->s_ntarglocaluvhub, stat->s_ntargremoteuvhub,
+ stat->s_ntarguvhub, stat->s_ntarguvhub16);
+ seq_printf(file, "%ld %ld %ld %ld %ld ",
+ stat->s_ntarguvhub8, stat->s_ntarguvhub4,
+ stat->s_ntarguvhub2, stat->s_ntarguvhub1,
+ stat->s_dtimeout);
+ seq_printf(file, "%ld %ld %ld %ld %ld %ld %ld %ld ",
+ stat->s_retry_messages, stat->s_retriesok,
+ stat->s_resets_plug, stat->s_resets_timeout,
+ stat->s_giveup, stat->s_stimeout,
+ stat->s_busy, stat->s_throttles);
+
+ /* destination side statistics */
+ seq_printf(file,
+ "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
uv_read_global_mmr64(uv_cpu_to_pnode(cpu),
UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE),
- stat->sflush, stat->dflush,
- stat->retriesok, stat->nomsg,
- stat->multmsg, stat->ntargeted);
+ stat->d_requestee, cycles_2_us(stat->d_time),
+ stat->d_alltlb, stat->d_onetlb, stat->d_multmsg,
+ stat->d_nomsg, stat->d_retries, stat->d_canceled,
+ stat->d_nocanceled, stat->d_resets,
+ stat->d_rcanceled);
+ seq_printf(file, "%ld %ld\n",
+ stat->s_bau_disabled, stat->s_bau_reenabled);
}
return 0;
}
/*
+ * Display the tunables thru debugfs
+ */
+static ssize_t tunables_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ char buf[300];
+ int ret;
+
+ ret = snprintf(buf, 300, "%s %s %s\n%d %d %d %d %d %d %d %d %d\n",
+ "max_bau_concurrent plugged_delay plugsb4reset",
+ "timeoutsb4reset ipi_reset_limit complete_threshold",
+ "congested_response_us congested_reps congested_period",
+ max_bau_concurrent, plugged_delay, plugsb4reset,
+ timeoutsb4reset, ipi_reset_limit, complete_threshold,
+ congested_response_us, congested_reps, congested_period);
+
+ return simple_read_from_buffer(userbuf, count, ppos, buf, ret);
+}
+
+/*
+ * -1: resetf the statistics
* 0: display meaning of the statistics
- * >0: retry limit
*/
static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
size_t count, loff_t *data)
{
- long newmode;
+ int cpu;
+ long input_arg;
char optstr[64];
+ struct ptc_stats *stat;
if (count == 0 || count > sizeof(optstr))
return -EINVAL;
if (copy_from_user(optstr, user, count))
return -EFAULT;
optstr[count - 1] = '\0';
- if (strict_strtoul(optstr, 10, &newmode) < 0) {
+ if (strict_strtol(optstr, 10, &input_arg) < 0) {
printk(KERN_DEBUG "%s is invalid\n", optstr);
return -EINVAL;
}
- if (newmode == 0) {
+ if (input_arg == 0) {
printk(KERN_DEBUG "# cpu: cpu number\n");
+ printk(KERN_DEBUG "Sender statistics:\n");
printk(KERN_DEBUG
- "requestor: times this cpu was the flush requestor\n");
+ "sent: number of shootdown messages sent\n");
printk(KERN_DEBUG
- "requestee: times this cpu was requested to flush its TLBs\n");
+ "stime: time spent sending messages\n");
printk(KERN_DEBUG
- "one: times requested to flush a single address\n");
+ "numuvhubs: number of hubs targeted with shootdown\n");
printk(KERN_DEBUG
- "all: times requested to flush all TLB's\n");
+ "numuvhubs16: number times 16 or more hubs targeted\n");
printk(KERN_DEBUG
- "sretry: number of retries of source-side timeouts\n");
+ "numuvhubs8: number times 8 or more hubs targeted\n");
printk(KERN_DEBUG
- "dretry: number of retries of destination-side timeouts\n");
+ "numuvhubs4: number times 4 or more hubs targeted\n");
printk(KERN_DEBUG
- "ptc_i: times UV fell through to IPI-style flushes\n");
+ "numuvhubs2: number times 2 or more hubs targeted\n");
printk(KERN_DEBUG
- "sw_ack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n");
+ "numuvhubs1: number times 1 hub targeted\n");
printk(KERN_DEBUG
- "sflush_us: cycles spent in uv_flush_tlb_others()\n");
+ "numcpus: number of cpus targeted with shootdown\n");
printk(KERN_DEBUG
- "dflush_us: cycles spent in handling flush requests\n");
- printk(KERN_DEBUG "sok: successes on retry\n");
- printk(KERN_DEBUG "dnomsg: interrupts with no message\n");
+ "dto: number of destination timeouts\n");
printk(KERN_DEBUG
- "dmult: interrupts with multiple messages\n");
- printk(KERN_DEBUG "starget: nodes targeted\n");
- } else {
- uv_bau_retry_limit = newmode;
- printk(KERN_DEBUG "timeout retry limit:%d\n",
- uv_bau_retry_limit);
+ "retries: destination timeout retries sent\n");
+ printk(KERN_DEBUG
+ "rok: : destination timeouts successfully retried\n");
+ printk(KERN_DEBUG
+ "resetp: ipi-style resource resets for plugs\n");
+ printk(KERN_DEBUG
+ "resett: ipi-style resource resets for timeouts\n");
+ printk(KERN_DEBUG
+ "giveup: fall-backs to ipi-style shootdowns\n");
+ printk(KERN_DEBUG
+ "sto: number of source timeouts\n");
+ printk(KERN_DEBUG
+ "bz: number of stay-busy's\n");
+ printk(KERN_DEBUG
+ "throt: number times spun in throttle\n");
+ printk(KERN_DEBUG "Destination side statistics:\n");
+ printk(KERN_DEBUG
+ "sw_ack: image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n");
+ printk(KERN_DEBUG
+ "recv: shootdown messages received\n");
+ printk(KERN_DEBUG
+ "rtime: time spent processing messages\n");
+ printk(KERN_DEBUG
+ "all: shootdown all-tlb messages\n");
+ printk(KERN_DEBUG
+ "one: shootdown one-tlb messages\n");
+ printk(KERN_DEBUG
+ "mult: interrupts that found multiple messages\n");
+ printk(KERN_DEBUG
+ "none: interrupts that found no messages\n");
+ printk(KERN_DEBUG
+ "retry: number of retry messages processed\n");
+ printk(KERN_DEBUG
+ "canc: number messages canceled by retries\n");
+ printk(KERN_DEBUG
+ "nocan: number retries that found nothing to cancel\n");
+ printk(KERN_DEBUG
+ "reset: number of ipi-style reset requests processed\n");
+ printk(KERN_DEBUG
+ "rcan: number messages canceled by reset requests\n");
+ printk(KERN_DEBUG
+ "disable: number times use of the BAU was disabled\n");
+ printk(KERN_DEBUG
+ "enable: number times use of the BAU was re-enabled\n");
+ } else if (input_arg == -1) {
+ for_each_present_cpu(cpu) {
+ stat = &per_cpu(ptcstats, cpu);
+ memset(stat, 0, sizeof(struct ptc_stats));
+ }
+ }
+
+ return count;
+}
+
+static int local_atoi(const char *name)
+{
+ int val = 0;
+
+ for (;; name++) {
+ switch (*name) {
+ case '0' ... '9':
+ val = 10*val+(*name-'0');
+ break;
+ default:
+ return val;
+ }
+ }
+}
+
+/*
+ * set the tunables
+ * 0 values reset them to defaults
+ */
+static ssize_t tunables_write(struct file *file, const char __user *user,
+ size_t count, loff_t *data)
+{
+ int cpu;
+ int cnt = 0;
+ int val;
+ char *p;
+ char *q;
+ char instr[64];
+ struct bau_control *bcp;
+
+ if (count == 0 || count > sizeof(instr)-1)
+ return -EINVAL;
+ if (copy_from_user(instr, user, count))
+ return -EFAULT;
+
+ instr[count] = '\0';
+ /* count the fields */
+ p = instr + strspn(instr, WHITESPACE);
+ q = p;
+ for (; *p; p = q + strspn(q, WHITESPACE)) {
+ q = p + strcspn(p, WHITESPACE);
+ cnt++;
+ if (q == p)
+ break;
+ }
+ if (cnt != 9) {
+ printk(KERN_INFO "bau tunable error: should be 9 numbers\n");
+ return -EINVAL;
}
+ p = instr + strspn(instr, WHITESPACE);
+ q = p;
+ for (cnt = 0; *p; p = q + strspn(q, WHITESPACE), cnt++) {
+ q = p + strcspn(p, WHITESPACE);
+ val = local_atoi(p);
+ switch (cnt) {
+ case 0:
+ if (val == 0) {
+ max_bau_concurrent = MAX_BAU_CONCURRENT;
+ max_bau_concurrent_constant =
+ MAX_BAU_CONCURRENT;
+ continue;
+ }
+ bcp = &per_cpu(bau_control, smp_processor_id());
+ if (val < 1 || val > bcp->cpus_in_uvhub) {
+ printk(KERN_DEBUG
+ "Error: BAU max concurrent %d is invalid\n",
+ val);
+ return -EINVAL;
+ }
+ max_bau_concurrent = val;
+ max_bau_concurrent_constant = val;
+ continue;
+ case 1:
+ if (val == 0)
+ plugged_delay = PLUGGED_DELAY;
+ else
+ plugged_delay = val;
+ continue;
+ case 2:
+ if (val == 0)
+ plugsb4reset = PLUGSB4RESET;
+ else
+ plugsb4reset = val;
+ continue;
+ case 3:
+ if (val == 0)
+ timeoutsb4reset = TIMEOUTSB4RESET;
+ else
+ timeoutsb4reset = val;
+ continue;
+ case 4:
+ if (val == 0)
+ ipi_reset_limit = IPI_RESET_LIMIT;
+ else
+ ipi_reset_limit = val;
+ continue;
+ case 5:
+ if (val == 0)
+ complete_threshold = COMPLETE_THRESHOLD;
+ else
+ complete_threshold = val;
+ continue;
+ case 6:
+ if (val == 0)
+ congested_response_us = CONGESTED_RESPONSE_US;
+ else
+ congested_response_us = val;
+ continue;
+ case 7:
+ if (val == 0)
+ congested_reps = CONGESTED_REPS;
+ else
+ congested_reps = val;
+ continue;
+ case 8:
+ if (val == 0)
+ congested_period = CONGESTED_PERIOD;
+ else
+ congested_period = val;
+ continue;
+ }
+ if (q == p)
+ break;
+ }
+ for_each_present_cpu(cpu) {
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->max_bau_concurrent = max_bau_concurrent;
+ bcp->max_bau_concurrent_constant = max_bau_concurrent;
+ bcp->plugged_delay = plugged_delay;
+ bcp->plugsb4reset = plugsb4reset;
+ bcp->timeoutsb4reset = timeoutsb4reset;
+ bcp->ipi_reset_limit = ipi_reset_limit;
+ bcp->complete_threshold = complete_threshold;
+ bcp->congested_response_us = congested_response_us;
+ bcp->congested_reps = congested_reps;
+ bcp->congested_period = congested_period;
+ }
return count;
}
@@ -624,6 +1280,11 @@ static int uv_ptc_proc_open(struct inode
return seq_open(file, &uv_ptc_seq_ops);
}
+static int tunables_open(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
static const struct file_operations proc_uv_ptc_operations = {
.open = uv_ptc_proc_open,
.read = seq_read,
@@ -632,6 +1293,12 @@ static const struct file_operations proc
.release = seq_release,
};
+static const struct file_operations tunables_fops = {
+ .open = tunables_open,
+ .read = tunables_read,
+ .write = tunables_write,
+};
+
static int __init uv_ptc_init(void)
{
struct proc_dir_entry *proc_uv_ptc;
@@ -646,83 +1313,48 @@ static int __init uv_ptc_init(void)
UV_PTC_BASENAME);
return -EINVAL;
}
- return 0;
-}
-
-/*
- * begin the initialization of the per-blade control structures
- */
-static struct bau_control * __init uv_table_bases_init(int blade, int node)
-{
- int i;
- struct bau_msg_status *msp;
- struct bau_control *bau_tabp;
-
- bau_tabp =
- kmalloc_node(sizeof(struct bau_control), GFP_KERNEL, node);
- BUG_ON(!bau_tabp);
-
- bau_tabp->msg_statuses =
- kmalloc_node(sizeof(struct bau_msg_status) *
- DEST_Q_SIZE, GFP_KERNEL, node);
- BUG_ON(!bau_tabp->msg_statuses);
-
- for (i = 0, msp = bau_tabp->msg_statuses; i < DEST_Q_SIZE; i++, msp++)
- bau_cpubits_clear(&msp->seen_by, (int)
- uv_blade_nr_possible_cpus(blade));
-
- uv_bau_table_bases[blade] = bau_tabp;
- return bau_tabp;
-}
-
-/*
- * finish the initialization of the per-blade control structures
- */
-static void __init
-uv_table_bases_finish(int blade,
- struct bau_control *bau_tablesp,
- struct bau_desc *adp)
-{
- struct bau_control *bcp;
- int cpu;
-
- for_each_present_cpu(cpu) {
- if (blade != uv_cpu_to_blade_id(cpu))
- continue;
-
- bcp = (struct bau_control *)&per_cpu(bau_control, cpu);
- bcp->bau_msg_head = bau_tablesp->va_queue_first;
- bcp->va_queue_first = bau_tablesp->va_queue_first;
- bcp->va_queue_last = bau_tablesp->va_queue_last;
- bcp->msg_statuses = bau_tablesp->msg_statuses;
- bcp->descriptor_base = adp;
+ tunables_dir = debugfs_create_dir(UV_BAU_TUNABLES_DIR, NULL);
+ if (!tunables_dir) {
+ printk(KERN_ERR "unable to create debugfs directory %s\n",
+ UV_BAU_TUNABLES_DIR);
+ return -EINVAL;
+ }
+ tunables_file = debugfs_create_file(UV_BAU_TUNABLES_FILE, 0600,
+ tunables_dir, NULL, &tunables_fops);
+ if (!tunables_file) {
+ printk(KERN_ERR "unable to create debugfs file %s\n",
+ UV_BAU_TUNABLES_FILE);
+ return -EINVAL;
}
+ return 0;
}
/*
* initialize the sending side's sending buffers
*/
-static struct bau_desc * __init
+static void
uv_activation_descriptor_init(int node, int pnode)
{
int i;
+ int cpu;
unsigned long pa;
unsigned long m;
unsigned long n;
- struct bau_desc *adp;
- struct bau_desc *ad2;
+ struct bau_desc *bau_desc;
+ struct bau_desc *bd2;
+ struct bau_control *bcp;
/*
* each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR)
- * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per blade
+ * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per uvhub
*/
- adp = (struct bau_desc *)kmalloc_node(sizeof(struct bau_desc)*
+ bau_desc = (struct bau_desc *)kmalloc_node(sizeof(struct bau_desc)*
UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node);
- BUG_ON(!adp);
+ BUG_ON(!bau_desc);
- pa = uv_gpa(adp); /* need the real nasid*/
- n = uv_gpa_to_pnode(pa);
+ pa = uv_gpa(bau_desc); /* need the real nasid*/
+ n = pa >> uv_nshift;
m = pa & uv_mmask;
uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE,
@@ -731,96 +1363,243 @@ uv_activation_descriptor_init(int node,
/*
* initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each
* cpu even though we only use the first one; one descriptor can
- * describe a broadcast to 256 nodes.
+ * describe a broadcast to 256 uv hubs.
*/
- for (i = 0, ad2 = adp; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR);
- i++, ad2++) {
- memset(ad2, 0, sizeof(struct bau_desc));
- ad2->header.sw_ack_flag = 1;
+ for (i = 0, bd2 = bau_desc; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR);
+ i++, bd2++) {
+ memset(bd2, 0, sizeof(struct bau_desc));
+ bd2->header.sw_ack_flag = 1;
/*
- * base_dest_nodeid is the first node in the partition, so
- * the bit map will indicate partition-relative node numbers.
- * note that base_dest_nodeid is actually a nasid.
+ * base_dest_nodeid is the nasid (pnode<<1) of the first uvhub
+ * in the partition. The bit map will indicate uvhub numbers,
+ * which are 0-N in a partition. Pnodes are unique system-wide.
*/
- ad2->header.base_dest_nodeid = uv_partition_base_pnode << 1;
- ad2->header.dest_subnodeid = 0x10; /* the LB */
- ad2->header.command = UV_NET_ENDPOINT_INTD;
- ad2->header.int_both = 1;
+ bd2->header.base_dest_nodeid = uv_partition_base_pnode << 1;
+ bd2->header.dest_subnodeid = 0x10; /* the LB */
+ bd2->header.command = UV_NET_ENDPOINT_INTD;
+ bd2->header.int_both = 1;
/*
* all others need to be set to zero:
* fairness chaining multilevel count replied_to
*/
}
- return adp;
+ for_each_present_cpu(cpu) {
+ if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu)))
+ continue;
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->descriptor_base = bau_desc;
+ }
}
/*
* initialize the destination side's receiving buffers
+ * entered for each uvhub in the partition
+ * - node is first node (kernel memory notion) on the uvhub
+ * - pnode is the uvhub's physical identifier
*/
-static struct bau_payload_queue_entry * __init
-uv_payload_queue_init(int node, int pnode, struct bau_control *bau_tablesp)
+static void
+uv_payload_queue_init(int node, int pnode)
{
- struct bau_payload_queue_entry *pqp;
- unsigned long pa;
int pn;
+ int cpu;
char *cp;
+ unsigned long pa;
+ struct bau_payload_queue_entry *pqp;
+ struct bau_payload_queue_entry *pqp_malloc;
+ struct bau_control *bcp;
pqp = (struct bau_payload_queue_entry *) kmalloc_node(
(DEST_Q_SIZE + 1) * sizeof(struct bau_payload_queue_entry),
GFP_KERNEL, node);
BUG_ON(!pqp);
+ pqp_malloc = pqp;
cp = (char *)pqp + 31;
pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5);
- bau_tablesp->va_queue_first = pqp;
+
+ for_each_present_cpu(cpu) {
+ if (pnode != uv_cpu_to_pnode(cpu))
+ continue;
+ /* for every cpu on this pnode: */
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->va_queue_first = pqp;
+ bcp->bau_msg_head = pqp;
+ bcp->va_queue_last = pqp + (DEST_Q_SIZE - 1);
+ }
/*
* need the pnode of where the memory was really allocated
*/
pa = uv_gpa(pqp);
- pn = uv_gpa_to_pnode(pa);
+ pn = pa >> uv_nshift;
uv_write_global_mmr64(pnode,
UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST,
((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) |
uv_physnodeaddr(pqp));
uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL,
uv_physnodeaddr(pqp));
- bau_tablesp->va_queue_last = pqp + (DEST_Q_SIZE - 1);
uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST,
(unsigned long)
- uv_physnodeaddr(bau_tablesp->va_queue_last));
+ uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1)));
+ /* in effect, all msg_type's are set to MSG_NOOP */
memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE);
-
- return pqp;
}
/*
- * Initialization of each UV blade's structures
+ * Initialization of each UV hub's structures
*/
-static int __init uv_init_blade(int blade)
+static void __init uv_init_uvhub(int uvhub, int vector)
{
int node;
int pnode;
- unsigned long pa;
unsigned long apicid;
- struct bau_desc *adp;
- struct bau_payload_queue_entry *pqp;
- struct bau_control *bau_tablesp;
- node = blade_to_first_node(blade);
- bau_tablesp = uv_table_bases_init(blade, node);
- pnode = uv_blade_to_pnode(blade);
- adp = uv_activation_descriptor_init(node, pnode);
- pqp = uv_payload_queue_init(node, pnode, bau_tablesp);
- uv_table_bases_finish(blade, bau_tablesp, adp);
+ node = uvhub_to_first_node(uvhub);
+ pnode = uv_blade_to_pnode(uvhub);
+ uv_activation_descriptor_init(node, pnode);
+ uv_payload_queue_init(node, pnode);
/*
* the below initialization can't be in firmware because the
* messaging IRQ will be determined by the OS
*/
- apicid = blade_to_first_apicid(blade);
- pa = uv_read_global_mmr64(pnode, UVH_BAU_DATA_CONFIG);
+ apicid = uvhub_to_first_apicid(uvhub);
uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
- ((apicid << 32) | UV_BAU_MESSAGE));
- return 0;
+ ((apicid << 32) | vector));
+}
+
+/*
+ * We will set BAU_MISC_CONTROL with a timeout period.
+ * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT.
+ * So the destination timeout period has be be calculated from them.
+ */
+static int
+calculate_destination_timeout(void)
+{
+ unsigned long mmr_image;
+ int mult1;
+ int mult2;
+ int index;
+ int base;
+ int ret;
+ unsigned long ts_ns;
+
+ mult1 = UV_INTD_SOFT_ACK_TIMEOUT_PERIOD & BAU_MISC_CONTROL_MULT_MASK;
+ mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL);
+ index = (mmr_image >> BAU_URGENCY_7_SHIFT) & BAU_URGENCY_7_MASK;
+ mmr_image = uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT);
+ mult2 = (mmr_image >> BAU_TRANS_SHIFT) & BAU_TRANS_MASK;
+ base = timeout_base_ns[index];
+ ts_ns = base * mult1 * mult2;
+ ret = ts_ns / 1000;
+ return ret;
+}
+
+/*
+ * initialize the bau_control structure for each cpu
+ */
+static void uv_init_per_cpu(int nuvhubs)
+{
+ int i;
+ int cpu;
+ int pnode;
+ int uvhub;
+ short socket = 0;
+ unsigned short socket_mask;
+ unsigned int uvhub_mask;
+ struct bau_control *bcp;
+ struct uvhub_desc *bdp;
+ struct socket_desc *sdp;
+ struct bau_control *hmaster = NULL;
+ struct bau_control *smaster = NULL;
+ struct socket_desc {
+ short num_cpus;
+ short cpu_number[16];
+ };
+ struct uvhub_desc {
+ unsigned short socket_mask;
+ short num_cpus;
+ short uvhub;
+ short pnode;
+ struct socket_desc socket[2];
+ };
+ struct uvhub_desc *uvhub_descs;
+
+ timeout_us = calculate_destination_timeout();
+
+ uvhub_descs = (struct uvhub_desc *)
+ kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
+ memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
+ for_each_present_cpu(cpu) {
+ bcp = &per_cpu(bau_control, cpu);
+ memset(bcp, 0, sizeof(struct bau_control));
+ pnode = uv_cpu_hub_info(cpu)->pnode;
+ uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
+ uvhub_mask |= (1 << uvhub);
+ bdp = &uvhub_descs[uvhub];
+ bdp->num_cpus++;
+ bdp->uvhub = uvhub;
+ bdp->pnode = pnode;
+ /* kludge: 'assuming' one node per socket, and assuming that
+ disabling a socket just leaves a gap in node numbers */
+ socket = (cpu_to_node(cpu) & 1);;
+ bdp->socket_mask |= (1 << socket);
+ sdp = &bdp->socket[socket];
+ sdp->cpu_number[sdp->num_cpus] = cpu;
+ sdp->num_cpus++;
+ }
+ uvhub = 0;
+ while (uvhub_mask) {
+ if (!(uvhub_mask & 1))
+ goto nexthub;
+ bdp = &uvhub_descs[uvhub];
+ socket_mask = bdp->socket_mask;
+ socket = 0;
+ while (socket_mask) {
+ if (!(socket_mask & 1))
+ goto nextsocket;
+ sdp = &bdp->socket[socket];
+ for (i = 0; i < sdp->num_cpus; i++) {
+ cpu = sdp->cpu_number[i];
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->cpu = cpu;
+ if (i == 0) {
+ smaster = bcp;
+ if (socket == 0)
+ hmaster = bcp;
+ }
+ bcp->cpus_in_uvhub = bdp->num_cpus;
+ bcp->cpus_in_socket = sdp->num_cpus;
+ bcp->socket_master = smaster;
+ bcp->uvhub = bdp->uvhub;
+ bcp->uvhub_master = hmaster;
+ bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->
+ blade_processor_id;
+ }
+nextsocket:
+ socket++;
+ socket_mask = (socket_mask >> 1);
+ }
+nexthub:
+ uvhub++;
+ uvhub_mask = (uvhub_mask >> 1);
+ }
+ kfree(uvhub_descs);
+ for_each_present_cpu(cpu) {
+ bcp = &per_cpu(bau_control, cpu);
+ bcp->baudisabled = 0;
+ bcp->statp = &per_cpu(ptcstats, cpu);
+ /* time interval to catch a hardware stay-busy bug */
+ bcp->timeout_interval = microsec_2_cycles(2*timeout_us);
+ bcp->max_bau_concurrent = max_bau_concurrent;
+ bcp->max_bau_concurrent_constant = max_bau_concurrent;
+ bcp->plugged_delay = plugged_delay;
+ bcp->plugsb4reset = plugsb4reset;
+ bcp->timeoutsb4reset = timeoutsb4reset;
+ bcp->ipi_reset_limit = ipi_reset_limit;
+ bcp->complete_threshold = complete_threshold;
+ bcp->congested_response_us = congested_response_us;
+ bcp->congested_reps = congested_reps;
+ bcp->congested_period = congested_period;
+ }
}
/*
@@ -828,38 +1607,55 @@ static int __init uv_init_blade(int blad
*/
static int __init uv_bau_init(void)
{
- int blade;
- int nblades;
+ int uvhub;
+ int pnode;
+ int nuvhubs;
int cur_cpu;
+ int vector;
+ unsigned long mmr;
if (!is_uv_system())
return 0;
+ if (nobau)
+ return 0;
+
for_each_possible_cpu(cur_cpu)
zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu),
GFP_KERNEL, cpu_to_node(cur_cpu));
- uv_bau_retry_limit = 1;
+ uv_nshift = uv_hub_info->m_val;
uv_mmask = (1UL << uv_hub_info->m_val) - 1;
- nblades = uv_num_possible_blades();
+ nuvhubs = uv_num_possible_blades();
+ spin_lock_init(&disable_lock);
+ congested_cycles = microsec_2_cycles(congested_response_us);
- uv_bau_table_bases = (struct bau_control **)
- kmalloc(nblades * sizeof(struct bau_control *), GFP_KERNEL);
- BUG_ON(!uv_bau_table_bases);
+ uv_init_per_cpu(nuvhubs);
uv_partition_base_pnode = 0x7fffffff;
- for (blade = 0; blade < nblades; blade++)
- if (uv_blade_nr_possible_cpus(blade) &&
- (uv_blade_to_pnode(blade) < uv_partition_base_pnode))
- uv_partition_base_pnode = uv_blade_to_pnode(blade);
- for (blade = 0; blade < nblades; blade++)
- if (uv_blade_nr_possible_cpus(blade))
- uv_init_blade(blade);
+ for (uvhub = 0; uvhub < nuvhubs; uvhub++)
+ if (uv_blade_nr_possible_cpus(uvhub) &&
+ (uv_blade_to_pnode(uvhub) < uv_partition_base_pnode))
+ uv_partition_base_pnode = uv_blade_to_pnode(uvhub);
+
+ vector = UV_BAU_MESSAGE;
+ for_each_possible_blade(uvhub)
+ if (uv_blade_nr_possible_cpus(uvhub))
+ uv_init_uvhub(uvhub, vector);
- alloc_intr_gate(UV_BAU_MESSAGE, uv_bau_message_intr1);
uv_enable_timeouts();
+ alloc_intr_gate(vector, uv_bau_message_intr1);
+
+ for_each_possible_blade(uvhub) {
+ pnode = uv_blade_to_pnode(uvhub);
+ /* INIT the bau */
+ uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_ACTIVATION_CONTROL,
+ ((unsigned long)1 << 63));
+ mmr = 1; /* should be 1 to broadcast to both sockets */
+ uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST, mmr);
+ }
return 0;
}
-__initcall(uv_bau_init);
-__initcall(uv_ptc_init);
+core_initcall(uv_bau_init);
+fs_initcall(uv_ptc_init);
--
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