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Commit 113134fc authored by Alex Chiang's avatar Alex Chiang Committed by Tony Luck
Browse files

[IA64] /proc/cpuinfo "physical id" field cleanups 



Clean up the process for presenting the "physical id" field in
/proc/cpuinfo.

	- remove global smp_num_cpucores, as it is mostly useless

	- remove check_for_logical_procs(), since we do the same
	  functionality in identify_siblings()

	- reflow logic in identify_siblings(). If an older CPU
	  does not implement PAL_LOGICAL_TO_PHYSICAL, we may still
	  be able to get useful information from SAL_PHYSICAL_ID_INFO

	- in identify_siblings(), threads/cores are a property of
	  the CPU, not the platform

	- remove useless printk's about multi-core / thread
	  capability in identify_siblings(), as that information
	  is readily available in /proc/cpuinfo, and printing for
	  the BSP only adds little value

	- smp_num_siblings is now meaningful if any CPU in the
	  system supports threads, not just the BSP

	- expose "physical id" field, even on CPUs that are not
	  multi-core / multi-threaded (as long as we have a valid
	  value). Now we know what sockets Madisons live in too.

Signed-off-by: default avatarAlex Chiang <achiang@hp.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 172c5106

arch/ia64/kernel/setup.c

+8 −41
Original line number Diff line number Diff line
@@ -417,34 +417,6 @@ mark_bsp_online (void) 
#endif

}



#ifdef CONFIG_SMP

static void __init

check_for_logical_procs (void)

{

	pal_logical_to_physical_t info;

	s64 status;



	status = ia64_pal_logical_to_phys(0, &info);

	if (status == -1) {

		printk(KERN_INFO "No logical to physical processor mapping "

		       "available\n");

		return;

	}

	if (status) {

		printk(KERN_ERR "ia64_pal_logical_to_phys failed with %ld\n",

		       status);

		return;

	}

	/*

	 * Total number of siblings that BSP has.  Though not all of them 

	 * may have booted successfully. The correct number of siblings 

	 * booted is in info.overview_num_log.

	 */

	smp_num_siblings = info.overview_tpc;

	smp_num_cpucores = info.overview_cpp;

}

#endif



static __initdata int nomca;

static __init int setup_nomca(char *s)

{
@@ -540,15 +512,6 @@ setup_arch (char **cmdline_p) 


#ifdef CONFIG_SMP

	cpu_physical_id(0) = hard_smp_processor_id();

	check_for_logical_procs();

	if (smp_num_cpucores > 1)

		printk(KERN_INFO

		       "cpu package is Multi-Core capable: number of cores=%d\n",

		       smp_num_cpucores);

	if (smp_num_siblings > 1)

		printk(KERN_INFO

		       "cpu package is Multi-Threading capable: number of siblings=%d\n",

		       smp_num_siblings);

#endif



	cpu_init();	/* initialize the bootstrap CPU */
@@ -661,12 +624,13 @@ show_cpuinfo (struct seq_file *m, void *v) 
		   lpj*HZ/500000, (lpj*HZ/5000) % 100);

#ifdef CONFIG_SMP

	seq_printf(m, "siblings   : %u\n", cpus_weight(cpu_core_map[cpunum]));

	if (c->socket_id != -1)

		seq_printf(m, "physical id: %u\n", c->socket_id);

	if (c->threads_per_core > 1 || c->cores_per_socket > 1)

		seq_printf(m,

		   	   "physical id: %u\n"

			   "core id    : %u\n"

			   "thread id  : %u\n",

		   	   c->socket_id, c->core_id, c->thread_id);

			   c->core_id, c->thread_id);

#endif

	seq_printf(m,"\n");
@@ -778,6 +742,9 @@ identify_cpu (struct cpuinfo_ia64 *c) 
	c->socket_id = -1;



	identify_siblings(c);



	if (c->threads_per_core > smp_num_siblings)

		smp_num_siblings = c->threads_per_core;

#endif

	c->ppn = cpuid.field.ppn;

	c->number = cpuid.field.number;

arch/ia64/kernel/smpboot.c

+14 −7
Original line number Diff line number Diff line
@@ -142,7 +142,6 @@ DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); 
EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);



int smp_num_siblings = 1;

int smp_num_cpucores = 1;



/* which logical CPU number maps to which CPU (physical APIC ID) */

volatile int ia64_cpu_to_sapicid[NR_CPUS];
@@ -886,20 +885,28 @@ identify_siblings(struct cpuinfo_ia64 *c) 
	u16 pltid;

	pal_logical_to_physical_t info;



	if (smp_num_cpucores == 1 && smp_num_siblings == 1)

		return;



	if ((status = ia64_pal_logical_to_phys(-1, &info)) != PAL_STATUS_SUCCESS) {

		printk(KERN_ERR "ia64_pal_logical_to_phys failed with %ld\n",

		if (status != PAL_STATUS_UNIMPLEMENTED) {

			printk(KERN_ERR

				"ia64_pal_logical_to_phys failed with %ld\n",

				status);

			return;

		}



		info.overview_ppid = 0;

		info.overview_cpp  = 1;

		info.overview_tpc  = 1;

	}

	if ((status = ia64_sal_physical_id_info(&pltid)) != PAL_STATUS_SUCCESS) {

		printk(KERN_ERR "ia64_sal_pltid failed with %ld\n", status);

		return;

	}



	c->socket_id =  (pltid << 8) | info.overview_ppid;



	if (info.overview_cpp == 1 && info.overview_tpc == 1)

		return;



	c->cores_per_socket = info.overview_cpp;

	c->threads_per_core = info.overview_tpc;

	c->num_log = info.overview_num_log;

include/asm-ia64/smp.h

+0 −1
Original line number Diff line number Diff line
@@ -60,7 +60,6 @@ extern cpumask_t cpu_online_map; 
extern cpumask_t cpu_core_map[NR_CPUS];

DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);

extern int smp_num_siblings;

extern int smp_num_cpucores;

extern void __iomem *ipi_base_addr;

extern unsigned char smp_int_redirect;