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Subject[GIT PULL CORRECTED] x86 fixes for v3.3-rc1
Hi Linus,

The following changes since commit 90a4c0f51e8e44111a926be6f4c87af3938a79c3:

uml: fix compile for x86-64 (2012-01-18 19:26:11 -0800)

are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-for-linus

The head of this tree is 4f2f81a5621de47d42476d0b929be2e0d565df84.

Anton Vorontsov (1):
x86: Get rid of dubious one-bit signed bitfield

Cliff Wickman (6):
x86/UV2: Fix new UV2 hardware by using native UV2 broadcast mode
x86/UV2: Fix BAU destination timeout initialization
x86/UV2: Work around BAU bug
x86/UV2: Remove stale no-resources test for UV2 BAU
x86/UV2: Ack BAU interrupt earlier
x86/UV2: Add accounting for BAU strong nacks

H. Peter Anvin (2):
Merge remote-tracking branch 'linus/master' into x86/urgent
x86, syscall: Need __ARCH_WANT_SYS_IPC for 32 bits

Linus Torvalds (1):
x86, tsc: Fix SMI induced variation in quick_pit_calibrate()

Randy Dunlap (1):
x86/kconfig: Move the ZONE_DMA entry under a menu

Ulrich Drepper (1):
x86, opcode: ANDN and Group 17 in x86-opcode-map.txt

arch/x86/Kconfig | 20 +-
arch/x86/include/asm/unistd.h | 1 +
arch/x86/include/asm/uv/uv_bau.h | 107 ++++++++++-
arch/x86/kernel/tsc.c | 14 +-
arch/x86/lib/x86-opcode-map.txt | 4 +-
arch/x86/platform/uv/tlb_uv.c | 388 +++++++++++++++++++++++++++++++-------
6 files changed, 434 insertions(+), 100 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 6c14ecd..864cc6e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -125,16 +125,6 @@ config HAVE_LATENCYTOP_SUPPORT
config MMU
def_bool y

-config ZONE_DMA
- bool "DMA memory allocation support" if EXPERT
- default y
- help
- DMA memory allocation support allows devices with less than 32-bit
- addressing to allocate within the first 16MB of address space.
- Disable if no such devices will be used.
-
- If unsure, say Y.
-
config SBUS
bool

@@ -255,6 +245,16 @@ source "kernel/Kconfig.freezer"

menu "Processor type and features"

+config ZONE_DMA
+ bool "DMA memory allocation support" if EXPERT
+ default y
+ help
+ DMA memory allocation support allows devices with less than 32-bit
+ addressing to allocate within the first 16MB of address space.
+ Disable if no such devices will be used.
+
+ If unsure, say Y.
+
source "kernel/time/Kconfig"

config SMP
diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h
index b4a3db7..21f77b8 100644
--- a/arch/x86/include/asm/unistd.h
+++ b/arch/x86/include/asm/unistd.h
@@ -7,6 +7,7 @@
# include <asm/unistd_32.h>
# define __ARCH_WANT_IPC_PARSE_VERSION
# define __ARCH_WANT_STAT64
+# define __ARCH_WANT_SYS_IPC
# define __ARCH_WANT_SYS_OLD_MMAP
# define __ARCH_WANT_SYS_OLD_SELECT

diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index 8e862aa..becf47b 100644
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -65,7 +65,7 @@
* UV2: Bit 19 selects between
* (0): 10 microsecond timebase and
* (1): 80 microseconds
- * we're using 655us, similar to UV1: 65 units of 10us
+ * we're using 560us, similar to UV1: 65 units of 10us
*/
#define UV1_INTD_SOFT_ACK_TIMEOUT_PERIOD (9UL)
#define UV2_INTD_SOFT_ACK_TIMEOUT_PERIOD (15UL)
@@ -167,6 +167,7 @@
#define FLUSH_RETRY_TIMEOUT 2
#define FLUSH_GIVEUP 3
#define FLUSH_COMPLETE 4
+#define FLUSH_RETRY_BUSYBUG 5

/*
* tuning the action when the numalink network is extremely delayed
@@ -235,10 +236,10 @@ struct bau_msg_payload {


/*
- * Message header: 16 bytes (128 bits) (bytes 0x30-0x3f of descriptor)
+ * UV1 Message header: 16 bytes (128 bits) (bytes 0x30-0x3f of descriptor)
* see table 4.2.3.0.1 in broacast_assist spec.
*/
-struct bau_msg_header {
+struct uv1_bau_msg_header {
unsigned int dest_subnodeid:6; /* must be 0x10, for the LB */
/* bits 5:0 */
unsigned int base_dest_nasid:15; /* nasid of the first bit */
@@ -318,19 +319,87 @@ struct bau_msg_header {
};

/*
+ * UV2 Message header: 16 bytes (128 bits) (bytes 0x30-0x3f of descriptor)
+ * see figure 9-2 of harp_sys.pdf
+ */
+struct uv2_bau_msg_header {
+ unsigned int base_dest_nasid:15; /* nasid of the first bit */
+ /* bits 14:0 */ /* in uvhub map */
+ unsigned int dest_subnodeid:5; /* must be 0x10, for the LB */
+ /* bits 19:15 */
+ unsigned int rsvd_1:1; /* must be zero */
+ /* bit 20 */
+ /* Address bits 59:21 */
+ /* bits 25:2 of address (44:21) are payload */
+ /* these next 24 bits become bytes 12-14 of msg */
+ /* bits 28:21 land in byte 12 */
+ unsigned int replied_to:1; /* sent as 0 by the source to
+ byte 12 */
+ /* bit 21 */
+ unsigned int msg_type:3; /* software type of the
+ message */
+ /* bits 24:22 */
+ unsigned int canceled:1; /* message canceled, resource
+ is to be freed*/
+ /* bit 25 */
+ unsigned int payload_1:3; /* not currently used */
+ /* bits 28:26 */
+
+ /* bits 36:29 land in byte 13 */
+ unsigned int payload_2a:3; /* not currently used */
+ unsigned int payload_2b:5; /* not currently used */
+ /* bits 36:29 */
+
+ /* bits 44:37 land in byte 14 */
+ unsigned int payload_3:8; /* not currently used */
+ /* bits 44:37 */
+
+ unsigned int rsvd_2:7; /* reserved */
+ /* bits 51:45 */
+ unsigned int swack_flag:1; /* software acknowledge flag */
+ /* bit 52 */
+ unsigned int rsvd_3a:3; /* must be zero */
+ unsigned int rsvd_3b:8; /* must be zero */
+ unsigned int rsvd_3c:8; /* must be zero */
+ unsigned int rsvd_3d:3; /* must be zero */
+ /* bits 74:53 */
+ unsigned int fairness:3; /* usually zero */
+ /* bits 77:75 */
+
+ unsigned int sequence:16; /* message sequence number */
+ /* bits 93:78 Suppl_A */
+ unsigned int chaining:1; /* next descriptor is part of
+ this activation*/
+ /* bit 94 */
+ unsigned int multilevel:1; /* multi-level multicast
+ format */
+ /* bit 95 */
+ unsigned int rsvd_4:24; /* ordered / source node /
+ source subnode / aging
+ must be zero */
+ /* bits 119:96 */
+ unsigned int command:8; /* message type */
+ /* bits 127:120 */
+};
+
+/*
* The activation descriptor:
* The format of the message to send, plus all accompanying control
* Should be 64 bytes
*/
struct bau_desc {
- struct pnmask distribution;
+ struct pnmask distribution;
/*
* message template, consisting of header and payload:
*/
- struct bau_msg_header header;
- struct bau_msg_payload payload;
+ union bau_msg_header {
+ struct uv1_bau_msg_header uv1_hdr;
+ struct uv2_bau_msg_header uv2_hdr;
+ } header;
+
+ struct bau_msg_payload payload;
};
-/*
+/* UV1:
* -payload-- ---------header------
* bytes 0-11 bits 41-56 bits 58-81
* A B (2) C (3)
@@ -340,6 +409,16 @@ struct bau_desc {
* bytes 0-11 bytes 12-14 bytes 16-17 (byte 15 filled in by hw as vector)
* ------------payload queue-----------
*/
+/* UV2:
+ * -payload-- ---------header------
+ * bytes 0-11 bits 70-78 bits 21-44
+ * A B (2) C (3)
+ *
+ * A/B/C are moved to:
+ * A C B
+ * bytes 0-11 bytes 12-14 bytes 16-17 (byte 15 filled in by hw as vector)
+ * ------------payload queue-----------
+ */

/*
* The payload queue on the destination side is an array of these.
@@ -385,7 +464,6 @@ struct bau_pq_entry {
struct msg_desc {
struct bau_pq_entry *msg;
int msg_slot;
- int swack_slot;
struct bau_pq_entry *queue_first;
struct bau_pq_entry *queue_last;
};
@@ -405,6 +483,7 @@ struct ptc_stats {
requests */
unsigned long s_stimeout; /* source side timeouts */
unsigned long s_dtimeout; /* destination side timeouts */
+ unsigned long s_strongnacks; /* number of strong nack's */
unsigned long s_time; /* time spent in sending side */
unsigned long s_retriesok; /* successful retries */
unsigned long s_ntargcpu; /* total number of cpu's
@@ -439,6 +518,9 @@ struct ptc_stats {
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 */
+ unsigned long s_uv2_wars; /* uv2 workaround, perm. busy */
+ unsigned long s_uv2_wars_hw; /* uv2 workaround, hiwater */
+ unsigned long s_uv2_war_waits; /* uv2 workaround, long waits */
/* destination statistics */
unsigned long d_alltlb; /* times all tlb's on this
cpu were flushed */
@@ -511,9 +593,12 @@ struct bau_control {
short osnode;
short uvhub_cpu;
short uvhub;
+ short uvhub_version;
short cpus_in_socket;
short cpus_in_uvhub;
short partition_base_pnode;
+ short using_desc; /* an index, like uvhub_cpu */
+ unsigned int inuse_map;
unsigned short message_number;
unsigned short uvhub_quiesce;
short socket_acknowledge_count[DEST_Q_SIZE];
@@ -531,6 +616,7 @@ struct bau_control {
int cong_response_us;
int cong_reps;
int cong_period;
+ unsigned long clocks_per_100_usec;
cycles_t period_time;
long period_requests;
struct hub_and_pnode *thp;
@@ -591,6 +677,11 @@ static inline void write_mmr_sw_ack(unsigned long mr)
uv_write_local_mmr(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, mr);
}

+static inline void write_gmmr_sw_ack(int pnode, unsigned long mr)
+{
+ write_gmmr(pnode, UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, mr);
+}
+
static inline unsigned long read_mmr_sw_ack(void)
{
return read_lmmr(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index c0dd5b6..a62c201 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -290,14 +290,15 @@ static inline int pit_verify_msb(unsigned char val)
static inline int pit_expect_msb(unsigned char val, u64 *tscp, unsigned long *deltap)
{
int count;
- u64 tsc = 0;
+ u64 tsc = 0, prev_tsc = 0;

for (count = 0; count < 50000; count++) {
if (!pit_verify_msb(val))
break;
+ prev_tsc = tsc;
tsc = get_cycles();
}
- *deltap = get_cycles() - tsc;
+ *deltap = get_cycles() - prev_tsc;
*tscp = tsc;

/*
@@ -311,9 +312,9 @@ static inline int pit_expect_msb(unsigned char val, u64 *tscp, unsigned long *de
* How many MSB values do we want to see? We aim for
* a maximum error rate of 500ppm (in practice the
* real error is much smaller), but refuse to spend
- * more than 25ms on it.
+ * more than 50ms on it.
*/
-#define MAX_QUICK_PIT_MS 25
+#define MAX_QUICK_PIT_MS 50
#define MAX_QUICK_PIT_ITERATIONS (MAX_QUICK_PIT_MS * PIT_TICK_RATE / 1000 / 256)

static unsigned long quick_pit_calibrate(void)
@@ -383,15 +384,12 @@ success:
*
* As a result, we can depend on there not being
* any odd delays anywhere, and the TSC reads are
- * reliable (within the error). We also adjust the
- * delta to the middle of the error bars, just
- * because it looks nicer.
+ * reliable (within the error).
*
* kHz = ticks / time-in-seconds / 1000;
* kHz = (t2 - t1) / (I * 256 / PIT_TICK_RATE) / 1000
* kHz = ((t2 - t1) * PIT_TICK_RATE) / (I * 256 * 1000)
*/
- delta += (long)(d2 - d1)/2;
delta *= PIT_TICK_RATE;
do_div(delta, i*256*1000);
printk("Fast TSC calibration using PIT\n");
diff --git a/arch/x86/lib/x86-opcode-map.txt b/arch/x86/lib/x86-opcode-map.txt
index 5b83c51..4c8010d 100644
--- a/arch/x86/lib/x86-opcode-map.txt
+++ b/arch/x86/lib/x86-opcode-map.txt
@@ -729,8 +729,8 @@ de: VAESDEC Vdq,Hdq,Wdq (66),(v1)
df: VAESDECLAST Vdq,Hdq,Wdq (66),(v1)
f0: MOVBE Gy,My | MOVBE Gw,Mw (66) | CRC32 Gd,Eb (F2)
f1: MOVBE My,Gy | MOVBE Mw,Gw (66) | CRC32 Gd,Ey (F2)
-f3: ANDN Gy,By,Ey (v)
-f4: Grp17 (1A)
+f2: ANDN Gy,By,Ey (v)
+f3: Grp17 (1A)
f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey (F2),(v)
f6: MULX By,Gy,rDX,Ey (F2),(v)
f7: BEXTR Gy,Ey,By (v) | SHLX Gy,Ey,By (66),(v) | SARX Gy,Ey,By (F3),(v) | SHRX Gy,Ey,By (F2),(v)
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 5b55219..9be4cff 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -157,13 +157,14 @@ static int __init uvhub_to_first_apicid(int uvhub)
* 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 reply_to_message(struct msg_desc *mdp, struct bau_control *bcp)
+static void reply_to_message(struct msg_desc *mdp, struct bau_control *bcp,
+ int do_acknowledge)
{
unsigned long dw;
struct bau_pq_entry *msg;

msg = mdp->msg;
- if (!msg->canceled) {
+ if (!msg->canceled && do_acknowledge) {
dw = (msg->swack_vec << UV_SW_ACK_NPENDING) | msg->swack_vec;
write_mmr_sw_ack(dw);
}
@@ -212,8 +213,8 @@ static void bau_process_retry_msg(struct msg_desc *mdp,
if (mmr & (msg_res << UV_SW_ACK_NPENDING)) {
unsigned long mr;
/*
- * is the resource timed out?
- * make everyone ignore the cancelled message.
+ * Is the resource timed out?
+ * Make everyone ignore the cancelled message.
*/
msg2->canceled = 1;
stat->d_canceled++;
@@ -231,8 +232,8 @@ static void bau_process_retry_msg(struct msg_desc *mdp,
* 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 bau_process_message(struct msg_desc *mdp,
- struct bau_control *bcp)
+static void bau_process_message(struct msg_desc *mdp, struct bau_control *bcp,
+ int do_acknowledge)
{
short socket_ack_count = 0;
short *sp;
@@ -284,8 +285,9 @@ static void bau_process_message(struct msg_desc *mdp,
if (msg_ack_count == bcp->cpus_in_uvhub) {
/*
* All cpus in uvhub saw it; reply
+ * (unless we are in the UV2 workaround)
*/
- reply_to_message(mdp, bcp);
+ reply_to_message(mdp, bcp, do_acknowledge);
}
}

@@ -491,27 +493,138 @@ static int uv1_wait_completion(struct bau_desc *bau_desc,
/*
* UV2 has an extra bit of status in the ACTIVATION_STATUS_2 register.
*/
-static unsigned long uv2_read_status(unsigned long offset, int rshft, int cpu)
+static unsigned long uv2_read_status(unsigned long offset, int rshft, int desc)
{
unsigned long descriptor_status;
unsigned long descriptor_status2;

descriptor_status = ((read_lmmr(offset) >> rshft) & UV_ACT_STATUS_MASK);
- descriptor_status2 = (read_mmr_uv2_status() >> cpu) & 0x1UL;
+ descriptor_status2 = (read_mmr_uv2_status() >> desc) & 0x1UL;
descriptor_status = (descriptor_status << 1) | descriptor_status2;
return descriptor_status;
}

+/*
+ * Return whether the status of the descriptor that is normally used for this
+ * cpu (the one indexed by its hub-relative cpu number) is busy.
+ * The status of the original 32 descriptors is always reflected in the 64
+ * bits of UVH_LB_BAU_SB_ACTIVATION_STATUS_0.
+ * The bit provided by the activation_status_2 register is irrelevant to
+ * the status if it is only being tested for busy or not busy.
+ */
+int normal_busy(struct bau_control *bcp)
+{
+ int cpu = bcp->uvhub_cpu;
+ int mmr_offset;
+ int right_shift;
+
+ mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
+ right_shift = cpu * UV_ACT_STATUS_SIZE;
+ return (((((read_lmmr(mmr_offset) >> right_shift) &
+ UV_ACT_STATUS_MASK)) << 1) == UV2H_DESC_BUSY);
+}
+
+/*
+ * Entered when a bau descriptor has gone into a permanent busy wait because
+ * of a hardware bug.
+ * Workaround the bug.
+ */
+int handle_uv2_busy(struct bau_control *bcp)
+{
+ int busy_one = bcp->using_desc;
+ int normal = bcp->uvhub_cpu;
+ int selected = -1;
+ int i;
+ unsigned long descriptor_status;
+ unsigned long status;
+ int mmr_offset;
+ struct bau_desc *bau_desc_old;
+ struct bau_desc *bau_desc_new;
+ struct bau_control *hmaster = bcp->uvhub_master;
+ struct ptc_stats *stat = bcp->statp;
+ cycles_t ttm;
+
+ stat->s_uv2_wars++;
+ spin_lock(&hmaster->uvhub_lock);
+ /* try for the original first */
+ if (busy_one != normal) {
+ if (!normal_busy(bcp))
+ selected = normal;
+ }
+ if (selected < 0) {
+ /* can't use the normal, select an alternate */
+ mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_1;
+ descriptor_status = read_lmmr(mmr_offset);
+
+ /* scan available descriptors 32-63 */
+ for (i = 0; i < UV_CPUS_PER_AS; i++) {
+ if ((hmaster->inuse_map & (1 << i)) == 0) {
+ status = ((descriptor_status >>
+ (i * UV_ACT_STATUS_SIZE)) &
+ UV_ACT_STATUS_MASK) << 1;
+ if (status != UV2H_DESC_BUSY) {
+ selected = i + UV_CPUS_PER_AS;
+ break;
+ }
+ }
+ }
+ }
+
+ if (busy_one != normal)
+ /* mark the busy alternate as not in-use */
+ hmaster->inuse_map &= ~(1 << (busy_one - UV_CPUS_PER_AS));
+
+ if (selected >= 0) {
+ /* switch to the selected descriptor */
+ if (selected != normal) {
+ /* set the selected alternate as in-use */
+ hmaster->inuse_map |=
+ (1 << (selected - UV_CPUS_PER_AS));
+ if (selected > stat->s_uv2_wars_hw)
+ stat->s_uv2_wars_hw = selected;
+ }
+ bau_desc_old = bcp->descriptor_base;
+ bau_desc_old += (ITEMS_PER_DESC * busy_one);
+ bcp->using_desc = selected;
+ bau_desc_new = bcp->descriptor_base;
+ bau_desc_new += (ITEMS_PER_DESC * selected);
+ *bau_desc_new = *bau_desc_old;
+ } else {
+ /*
+ * All are busy. Wait for the normal one for this cpu to
+ * free up.
+ */
+ stat->s_uv2_war_waits++;
+ spin_unlock(&hmaster->uvhub_lock);
+ ttm = get_cycles();
+ do {
+ cpu_relax();
+ } while (normal_busy(bcp));
+ spin_lock(&hmaster->uvhub_lock);
+ /* switch to the original descriptor */
+ bcp->using_desc = normal;
+ bau_desc_old = bcp->descriptor_base;
+ bau_desc_old += (ITEMS_PER_DESC * bcp->using_desc);
+ bcp->using_desc = (ITEMS_PER_DESC * normal);
+ bau_desc_new = bcp->descriptor_base;
+ bau_desc_new += (ITEMS_PER_DESC * normal);
+ *bau_desc_new = *bau_desc_old; /* copy the entire descriptor */
+ }
+ spin_unlock(&hmaster->uvhub_lock);
+ return FLUSH_RETRY_BUSYBUG;
+}
+
static int uv2_wait_completion(struct bau_desc *bau_desc,
unsigned long mmr_offset, int right_shift,
struct bau_control *bcp, long try)
{
unsigned long descriptor_stat;
cycles_t ttm;
- int cpu = bcp->uvhub_cpu;
+ int desc = bcp->using_desc;
+ long busy_reps = 0;
struct ptc_stats *stat = bcp->statp;

- descriptor_stat = uv2_read_status(mmr_offset, right_shift, cpu);
+ descriptor_stat = uv2_read_status(mmr_offset, right_shift, desc);

/* spin on the status MMR, waiting for it to go idle */
while (descriptor_stat != UV2H_DESC_IDLE) {
@@ -522,32 +635,35 @@ static int uv2_wait_completion(struct bau_desc *bau_desc,
* our message and its state will stay IDLE.
*/
if ((descriptor_stat == UV2H_DESC_SOURCE_TIMEOUT) ||
- (descriptor_stat == UV2H_DESC_DEST_STRONG_NACK) ||
(descriptor_stat == UV2H_DESC_DEST_PUT_ERR)) {
stat->s_stimeout++;
return FLUSH_GIVEUP;
+ } else if (descriptor_stat == UV2H_DESC_DEST_STRONG_NACK) {
+ stat->s_strongnacks++;
+ bcp->conseccompletes = 0;
+ return FLUSH_GIVEUP;
} else if (descriptor_stat == UV2H_DESC_DEST_TIMEOUT) {
stat->s_dtimeout++;
- ttm = 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(ttm - bcp->send_message) < timeout_us) {
- bcp->conseccompletes = 0;
- return FLUSH_RETRY_PLUGGED;
- }
bcp->conseccompletes = 0;
return FLUSH_RETRY_TIMEOUT;
} else {
+ busy_reps++;
+ if (busy_reps > 1000000) {
+ /* not to hammer on the clock */
+ busy_reps = 0;
+ ttm = get_cycles();
+ if ((ttm - bcp->send_message) >
+ (bcp->clocks_per_100_usec)) {
+ return handle_uv2_busy(bcp);
+ }
+ }
/*
* descriptor_stat is still BUSY
*/
cpu_relax();
}
- descriptor_stat = uv2_read_status(mmr_offset, right_shift, cpu);
+ descriptor_stat = uv2_read_status(mmr_offset, right_shift,
+ desc);
}
bcp->conseccompletes++;
return FLUSH_COMPLETE;
@@ -563,17 +679,17 @@ static int wait_completion(struct bau_desc *bau_desc,
{
int right_shift;
unsigned long mmr_offset;
- int cpu = bcp->uvhub_cpu;
+ int desc = bcp->using_desc;

- if (cpu < UV_CPUS_PER_AS) {
+ if (desc < UV_CPUS_PER_AS) {
mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
- right_shift = cpu * UV_ACT_STATUS_SIZE;
+ right_shift = desc * UV_ACT_STATUS_SIZE;
} else {
mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_1;
- right_shift = ((cpu - UV_CPUS_PER_AS) * UV_ACT_STATUS_SIZE);
+ right_shift = ((desc - UV_CPUS_PER_AS) * UV_ACT_STATUS_SIZE);
}

- if (is_uv1_hub())
+ if (bcp->uvhub_version == 1)
return uv1_wait_completion(bau_desc, mmr_offset, right_shift,
bcp, try);
else
@@ -752,19 +868,22 @@ static void handle_cmplt(int completion_status, struct bau_desc *bau_desc,
* Returns 1 if it gives up entirely and the original cpu mask is to be
* returned to the kernel.
*/
-int uv_flush_send_and_wait(struct bau_desc *bau_desc,
- struct cpumask *flush_mask, struct bau_control *bcp)
+int uv_flush_send_and_wait(struct cpumask *flush_mask, struct bau_control *bcp)
{
int seq_number = 0;
int completion_stat = 0;
+ int uv1 = 0;
long try = 0;
unsigned long index;
cycles_t time1;
cycles_t time2;
struct ptc_stats *stat = bcp->statp;
struct bau_control *hmaster = bcp->uvhub_master;
+ struct uv1_bau_msg_header *uv1_hdr = NULL;
+ struct uv2_bau_msg_header *uv2_hdr = NULL;
+ struct bau_desc *bau_desc;

- if (is_uv1_hub())
+ if (bcp->uvhub_version == 1)
uv1_throttle(hmaster, stat);

while (hmaster->uvhub_quiesce)
@@ -772,22 +891,39 @@ int uv_flush_send_and_wait(struct bau_desc *bau_desc,

time1 = get_cycles();
do {
- if (try == 0) {
- bau_desc->header.msg_type = MSG_REGULAR;
+ bau_desc = bcp->descriptor_base;
+ bau_desc += (ITEMS_PER_DESC * bcp->using_desc);
+ if (bcp->uvhub_version == 1) {
+ uv1 = 1;
+ uv1_hdr = &bau_desc->header.uv1_hdr;
+ } else
+ uv2_hdr = &bau_desc->header.uv2_hdr;
+ if ((try == 0) || (completion_stat == FLUSH_RETRY_BUSYBUG)) {
+ if (uv1)
+ uv1_hdr->msg_type = MSG_REGULAR;
+ else
+ uv2_hdr->msg_type = MSG_REGULAR;
seq_number = bcp->message_number++;
} else {
- bau_desc->header.msg_type = MSG_RETRY;
+ if (uv1)
+ uv1_hdr->msg_type = MSG_RETRY;
+ else
+ uv2_hdr->msg_type = MSG_RETRY;
stat->s_retry_messages++;
}

- bau_desc->header.sequence = seq_number;
- index = (1UL << AS_PUSH_SHIFT) | bcp->uvhub_cpu;
+ if (uv1)
+ uv1_hdr->sequence = seq_number;
+ else
+ uv2_hdr->sequence = seq_number;
+ index = (1UL << AS_PUSH_SHIFT) | bcp->using_desc;
bcp->send_message = get_cycles();

write_mmr_activation(index);

try++;
completion_stat = wait_completion(bau_desc, bcp, try);
+ /* UV2: wait_completion() may change the bcp->using_desc */

handle_cmplt(completion_stat, bau_desc, bcp, hmaster, stat);

@@ -798,6 +934,7 @@ int uv_flush_send_and_wait(struct bau_desc *bau_desc,
}
cpu_relax();
} while ((completion_stat == FLUSH_RETRY_PLUGGED) ||
+ (completion_stat == FLUSH_RETRY_BUSYBUG) ||
(completion_stat == FLUSH_RETRY_TIMEOUT));

time2 = get_cycles();
@@ -812,6 +949,7 @@ int uv_flush_send_and_wait(struct bau_desc *bau_desc,
record_send_stats(time1, time2, bcp, stat, completion_stat, try);

if (completion_stat == FLUSH_GIVEUP)
+ /* FLUSH_GIVEUP will fall back to using IPI's for tlb flush */
return 1;
return 0;
}
@@ -967,7 +1105,7 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
stat->s_ntargself++;

bau_desc = bcp->descriptor_base;
- bau_desc += ITEMS_PER_DESC * bcp->uvhub_cpu;
+ bau_desc += (ITEMS_PER_DESC * bcp->using_desc);
bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
if (set_distrib_bits(flush_mask, bcp, bau_desc, &locals, &remotes))
return NULL;
@@ -980,13 +1118,86 @@ const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
* 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))
+ if (!uv_flush_send_and_wait(flush_mask, bcp))
return NULL;
else
return cpumask;
}

/*
+ * Search the message queue for any 'other' message with the same software
+ * acknowledge resource bit vector.
+ */
+struct bau_pq_entry *find_another_by_swack(struct bau_pq_entry *msg,
+ struct bau_control *bcp, unsigned char swack_vec)
+{
+ struct bau_pq_entry *msg_next = msg + 1;
+
+ if (msg_next > bcp->queue_last)
+ msg_next = bcp->queue_first;
+ while ((msg_next->swack_vec != 0) && (msg_next != msg)) {
+ if (msg_next->swack_vec == swack_vec)
+ return msg_next;
+ msg_next++;
+ if (msg_next > bcp->queue_last)
+ msg_next = bcp->queue_first;
+ }
+ return NULL;
+}
+
+/*
+ * UV2 needs to work around a bug in which an arriving message has not
+ * set a bit in the UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE register.
+ * Such a message must be ignored.
+ */
+void process_uv2_message(struct msg_desc *mdp, struct bau_control *bcp)
+{
+ unsigned long mmr_image;
+ unsigned char swack_vec;
+ struct bau_pq_entry *msg = mdp->msg;
+ struct bau_pq_entry *other_msg;
+
+ mmr_image = read_mmr_sw_ack();
+ swack_vec = msg->swack_vec;
+
+ if ((swack_vec & mmr_image) == 0) {
+ /*
+ * This message was assigned a swack resource, but no
+ * reserved acknowlegment is pending.
+ * The bug has prevented this message from setting the MMR.
+ * And no other message has used the same sw_ack resource.
+ * Do the requested shootdown but do not reply to the msg.
+ * (the 0 means make no acknowledge)
+ */
+ bau_process_message(mdp, bcp, 0);
+ return;
+ }
+
+ /*
+ * Some message has set the MMR 'pending' bit; it might have been
+ * another message. Look for that message.
+ */
+ other_msg = find_another_by_swack(msg, bcp, msg->swack_vec);
+ if (other_msg) {
+ /* There is another. Do not ack the current one. */
+ bau_process_message(mdp, bcp, 0);
+ /*
+ * Let the natural processing of that message acknowledge
+ * it. Don't get the processing of sw_ack's out of order.
+ */
+ return;
+ }
+
+ /*
+ * There is no other message using this sw_ack, so it is safe to
+ * acknowledge it.
+ */
+ bau_process_message(mdp, bcp, 1);
+
+ return;
+}
+
+/*
* The BAU message interrupt comes here. (registered by set_intr_gate)
* See entry_64.S
*
@@ -1009,6 +1220,7 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
struct ptc_stats *stat;
struct msg_desc msgdesc;

+ ack_APIC_irq();
time_start = get_cycles();

bcp = &per_cpu(bau_control, smp_processor_id());
@@ -1022,9 +1234,11 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
count++;

msgdesc.msg_slot = msg - msgdesc.queue_first;
- msgdesc.swack_slot = ffs(msg->swack_vec) - 1;
msgdesc.msg = msg;
- bau_process_message(&msgdesc, bcp);
+ if (bcp->uvhub_version == 2)
+ process_uv2_message(&msgdesc, bcp);
+ else
+ bau_process_message(&msgdesc, bcp, 1);

msg++;
if (msg > msgdesc.queue_last)
@@ -1036,8 +1250,6 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
stat->d_nomsg++;
else if (count > 1)
stat->d_multmsg++;
-
- ack_APIC_irq();
}

/*
@@ -1083,7 +1295,7 @@ static void __init enable_timeouts(void)
*/
mmr_image |= (1L << SOFTACK_MSHIFT);
if (is_uv2_hub()) {
- mmr_image |= (1L << UV2_LEG_SHFT);
+ mmr_image &= ~(1L << UV2_LEG_SHFT);
mmr_image |= (1L << UV2_EXT_SHFT);
}
write_mmr_misc_control(pnode, mmr_image);
@@ -1136,13 +1348,13 @@ static int ptc_seq_show(struct seq_file *file, void *data)
seq_printf(file,
"remotehub numuvhubs numuvhubs16 numuvhubs8 ");
seq_printf(file,
- "numuvhubs4 numuvhubs2 numuvhubs1 dto retries rok ");
+ "numuvhubs4 numuvhubs2 numuvhubs1 dto snacks retries rok ");
seq_printf(file,
"resetp resett giveup sto bz throt swack recv rtime ");
seq_printf(file,
"all one mult none retry canc nocan reset rcan ");
seq_printf(file,
- "disable enable\n");
+ "disable enable wars warshw warwaits\n");
}
if (cpu < num_possible_cpus() && cpu_online(cpu)) {
stat = &per_cpu(ptcstats, cpu);
@@ -1154,10 +1366,10 @@ static int ptc_seq_show(struct seq_file *file, void *data)
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 ",
+ seq_printf(file, "%ld %ld %ld %ld %ld %ld ",
stat->s_ntarguvhub8, stat->s_ntarguvhub4,
stat->s_ntarguvhub2, stat->s_ntarguvhub1,
- stat->s_dtimeout);
+ stat->s_dtimeout, stat->s_strongnacks);
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,
@@ -1173,8 +1385,10 @@ static int ptc_seq_show(struct seq_file *file, void *data)
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);
+ seq_printf(file, "%ld %ld %ld %ld %ld\n",
+ stat->s_bau_disabled, stat->s_bau_reenabled,
+ stat->s_uv2_wars, stat->s_uv2_wars_hw,
+ stat->s_uv2_war_waits);
}
return 0;
}
@@ -1432,12 +1646,15 @@ static void activation_descriptor_init(int node, int pnode, int base_pnode)
{
int i;
int cpu;
+ int uv1 = 0;
unsigned long gpa;
unsigned long m;
unsigned long n;
size_t dsize;
struct bau_desc *bau_desc;
struct bau_desc *bd2;
+ struct uv1_bau_msg_header *uv1_hdr;
+ struct uv2_bau_msg_header *uv2_hdr;
struct bau_control *bcp;

/*
@@ -1451,6 +1668,8 @@ static void activation_descriptor_init(int node, int pnode, int base_pnode)
gpa = uv_gpa(bau_desc);
n = uv_gpa_to_gnode(gpa);
m = uv_gpa_to_offset(gpa);
+ if (is_uv1_hub())
+ uv1 = 1;

/* the 14-bit pnode */
write_mmr_descriptor_base(pnode, (n << UV_DESC_PSHIFT | m));
@@ -1461,21 +1680,33 @@ static void activation_descriptor_init(int node, int pnode, int base_pnode)
*/
for (i = 0, bd2 = bau_desc; i < (ADP_SZ * ITEMS_PER_DESC); i++, bd2++) {
memset(bd2, 0, sizeof(struct bau_desc));
- bd2->header.swack_flag = 1;
- /*
- * The base_dest_nasid set in the message header is the nasid
- * of the first uvhub in the partition. The bit map will
- * indicate destination pnode numbers relative to that base.
- * They may not be consecutive if nasid striding is being used.
- */
- bd2->header.base_dest_nasid = UV_PNODE_TO_NASID(base_pnode);
- bd2->header.dest_subnodeid = UV_LB_SUBNODEID;
- 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
- */
+ if (uv1) {
+ uv1_hdr = &bd2->header.uv1_hdr;
+ uv1_hdr->swack_flag = 1;
+ /*
+ * The base_dest_nasid set in the message header
+ * is the nasid of the first uvhub in the partition.
+ * The bit map will indicate destination pnode numbers
+ * relative to that base. They may not be consecutive
+ * if nasid striding is being used.
+ */
+ uv1_hdr->base_dest_nasid =
+ UV_PNODE_TO_NASID(base_pnode);
+ uv1_hdr->dest_subnodeid = UV_LB_SUBNODEID;
+ uv1_hdr->command = UV_NET_ENDPOINT_INTD;
+ uv1_hdr->int_both = 1;
+ /*
+ * all others need to be set to zero:
+ * fairness chaining multilevel count replied_to
+ */
+ } else {
+ uv2_hdr = &bd2->header.uv2_hdr;
+ uv2_hdr->swack_flag = 1;
+ uv2_hdr->base_dest_nasid =
+ UV_PNODE_TO_NASID(base_pnode);
+ uv2_hdr->dest_subnodeid = UV_LB_SUBNODEID;
+ uv2_hdr->command = UV_NET_ENDPOINT_INTD;
+ }
}
for_each_present_cpu(cpu) {
if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu)))
@@ -1531,6 +1762,7 @@ static void pq_init(int node, int pnode)
write_mmr_payload_first(pnode, pn_first);
write_mmr_payload_tail(pnode, first);
write_mmr_payload_last(pnode, last);
+ write_gmmr_sw_ack(pnode, 0xffffUL);

/* in effect, all msg_type's are set to MSG_NOOP */
memset(pqp, 0, sizeof(struct bau_pq_entry) * DEST_Q_SIZE);
@@ -1584,14 +1816,14 @@ static int calculate_destination_timeout(void)
ts_ns = base * mult1 * mult2;
ret = ts_ns / 1000;
} else {
- /* 4 bits 0/1 for 10/80us, 3 bits of multiplier */
- mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL);
+ /* 4 bits 0/1 for 10/80us base, 3 bits of multiplier */
+ mmr_image = uv_read_local_mmr(UVH_LB_BAU_MISC_CONTROL);
mmr_image = (mmr_image & UV_SA_MASK) >> UV_SA_SHFT;
if (mmr_image & (1L << UV2_ACK_UNITS_SHFT))
- mult1 = 80;
+ base = 80;
else
- mult1 = 10;
- base = mmr_image & UV2_ACK_MASK;
+ base = 10;
+ mult1 = mmr_image & UV2_ACK_MASK;
ret = mult1 * base;
}
return ret;
@@ -1618,6 +1850,7 @@ static void __init init_per_cpu_tunables(void)
bcp->cong_response_us = congested_respns_us;
bcp->cong_reps = congested_reps;
bcp->cong_period = congested_period;
+ bcp->clocks_per_100_usec = usec_2_cycles(100);
}
}

@@ -1728,8 +1961,17 @@ static int scan_sock(struct socket_desc *sdp, struct uvhub_desc *bdp,
bcp->cpus_in_socket = sdp->num_cpus;
bcp->socket_master = *smasterp;
bcp->uvhub = bdp->uvhub;
+ if (is_uv1_hub())
+ bcp->uvhub_version = 1;
+ else if (is_uv2_hub())
+ bcp->uvhub_version = 2;
+ else {
+ printk(KERN_EMERG "uvhub version not 1 or 2\n");
+ return 1;
+ }
bcp->uvhub_master = *hmasterp;
bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->blade_processor_id;
+ bcp->using_desc = bcp->uvhub_cpu;
if (bcp->uvhub_cpu >= MAX_CPUS_PER_UVHUB) {
printk(KERN_EMERG "%d cpus per uvhub invalid\n",
bcp->uvhub_cpu);
@@ -1845,6 +2087,8 @@ static int __init uv_bau_init(void)
uv_base_pnode = uv_blade_to_pnode(uvhub);
}

+ enable_timeouts();
+
if (init_per_cpu(nuvhubs, uv_base_pnode)) {
nobau = 1;
return 0;
@@ -1855,7 +2099,6 @@ static int __init uv_bau_init(void)
if (uv_blade_nr_possible_cpus(uvhub))
init_uvhub(uvhub, vector, uv_base_pnode);

- enable_timeouts();
alloc_intr_gate(vector, uv_bau_message_intr1);

for_each_possible_blade(uvhub) {
@@ -1867,7 +2110,8 @@ static int __init uv_bau_init(void)
val = 1L << 63;
write_gmmr_activation(pnode, val);
mmr = 1; /* should be 1 to broadcast to both sockets */
- write_mmr_data_broadcast(pnode, mmr);
+ if (!is_uv1_hub())
+ write_mmr_data_broadcast(pnode, mmr);
}
}


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