Exemplo n.º 1
0
/*
 * Fill the partition reserved page with the information needed by
 * other partitions to discover we are alive and establish initial
 * communications.
 */
struct xpc_rsvd_page *
xpc_rsvd_page_init(void)
{
	struct xpc_rsvd_page *rp;
	AMO_t *amos_page;
	u64 rp_pa, nasid_array = 0;
	int i, ret;


	/* get the local reserved page's address */

	preempt_disable();
	rp_pa = xpc_get_rsvd_page_pa(cpuid_to_nasid(smp_processor_id()));
	preempt_enable();
	if (rp_pa == 0) {
		dev_err(xpc_part, "SAL failed to locate the reserved page\n");
		return NULL;
	}
	rp = (struct xpc_rsvd_page *) __va(rp_pa);

	if (rp->partid != sn_partition_id) {
		dev_err(xpc_part, "the reserved page's partid of %d should be "
			"%d\n", rp->partid, sn_partition_id);
		return NULL;
	}

	rp->version = XPC_RP_VERSION;

	/* establish the actual sizes of the nasid masks */
	if (rp->SAL_version == 1) {
		/* SAL_version 1 didn't set the nasids_size field */
		rp->nasids_size = 128;
	}
	xp_nasid_mask_bytes = rp->nasids_size;
	xp_nasid_mask_words = xp_nasid_mask_bytes / 8;

	/* setup the pointers to the various items in the reserved page */
	xpc_part_nasids = XPC_RP_PART_NASIDS(rp);
	xpc_mach_nasids = XPC_RP_MACH_NASIDS(rp);
	xpc_vars = XPC_RP_VARS(rp);
	xpc_vars_part = XPC_RP_VARS_PART(rp);

	/*
	 * Before clearing xpc_vars, see if a page of AMOs had been previously
	 * allocated. If not we'll need to allocate one and set permissions
	 * so that cross-partition AMOs are allowed.
	 *
	 * The allocated AMO page needs MCA reporting to remain disabled after
	 * XPC has unloaded.  To make this work, we keep a copy of the pointer
	 * to this page (i.e., amos_page) in the struct xpc_vars structure,
	 * which is pointed to by the reserved page, and re-use that saved copy
	 * on subsequent loads of XPC. This AMO page is never freed, and its
	 * memory protections are never restricted.
	 */
	if ((amos_page = xpc_vars->amos_page) == NULL) {
		amos_page = (AMO_t *) TO_AMO(uncached_alloc_page(0));
		if (amos_page == NULL) {
			dev_err(xpc_part, "can't allocate page of AMOs\n");
			return NULL;
		}

		/*
		 * Open up AMO-R/W to cpu.  This is done for Shub 1.1 systems
		 * when xpc_allow_IPI_ops() is called via xpc_hb_init().
		 */
		if (!enable_shub_wars_1_1()) {
			ret = sn_change_memprotect(ia64_tpa((u64) amos_page),
					PAGE_SIZE, SN_MEMPROT_ACCESS_CLASS_1,
					&nasid_array);
			if (ret != 0) {
				dev_err(xpc_part, "can't change memory "
					"protections\n");
				uncached_free_page(__IA64_UNCACHED_OFFSET |
						   TO_PHYS((u64) amos_page));
				return NULL;
			}
		}
	} else if (!IS_AMO_ADDRESS((u64) amos_page)) {
		/*
		 * EFI's XPBOOT can also set amos_page in the reserved page,
		 * but it happens to leave it as an uncached physical address
		 * and we need it to be an uncached virtual, so we'll have to
		 * convert it.
		 */
		if (!IS_AMO_PHYS_ADDRESS((u64) amos_page)) {
			dev_err(xpc_part, "previously used amos_page address "
				"is bad = 0x%p\n", (void *) amos_page);
			return NULL;
		}
		amos_page = (AMO_t *) TO_AMO((u64) amos_page);
	}

	/* clear xpc_vars */
	memset(xpc_vars, 0, sizeof(struct xpc_vars));

	xpc_vars->version = XPC_V_VERSION;
	xpc_vars->act_nasid = cpuid_to_nasid(0);
	xpc_vars->act_phys_cpuid = cpu_physical_id(0);
	xpc_vars->vars_part_pa = __pa(xpc_vars_part);
	xpc_vars->amos_page_pa = ia64_tpa((u64) amos_page);
	xpc_vars->amos_page = amos_page;  /* save for next load of XPC */


	/* clear xpc_vars_part */
	memset((u64 *) xpc_vars_part, 0, sizeof(struct xpc_vars_part) *
							XP_MAX_PARTITIONS);

	/* initialize the activate IRQ related AMO variables */
	for (i = 0; i < xp_nasid_mask_words; i++) {
		(void) xpc_IPI_init(XPC_ACTIVATE_IRQ_AMOS + i);
	}

	/* initialize the engaged remote partitions related AMO variables */
	(void) xpc_IPI_init(XPC_ENGAGED_PARTITIONS_AMO);
	(void) xpc_IPI_init(XPC_DISENGAGE_REQUEST_AMO);

	/* timestamp of when reserved page was setup by XPC */
	rp->stamp = CURRENT_TIME;

	/*
	 * This signifies to the remote partition that our reserved
	 * page is initialized.
	 */
	rp->vars_pa = __pa(xpc_vars);

	return rp;
}
Exemplo n.º 2
0
/*
 * Fill the partition reserved page with the information needed by
 * other partitions to discover we are alive and establish initial
 * communications.
 */
struct xpc_rsvd_page *
xpc_rsvd_page_init(void)
{
	struct xpc_rsvd_page *rp;
	AMO_t *amos_page;
	u64 rp_pa, next_cl, nasid_array = 0;
	int i, ret;


	/* get the local reserved page's address */

	rp_pa = xpc_get_rsvd_page_pa(cnodeid_to_nasid(0),
					(u64) xpc_remote_copy_buffer,
						XPC_RSVD_PAGE_ALIGNED_SIZE);
	if (rp_pa == 0) {
		dev_err(xpc_part, "SAL failed to locate the reserved page\n");
		return NULL;
	}
	rp = (struct xpc_rsvd_page *) __va(rp_pa);

	if (rp->partid != sn_partition_id) {
		dev_err(xpc_part, "the reserved page's partid of %d should be "
			"%d\n", rp->partid, sn_partition_id);
		return NULL;
	}

	rp->version = XPC_RP_VERSION;

	/*
	 * Place the XPC variables on the cache line following the
	 * reserved page structure.
	 */
	next_cl = (u64) rp + XPC_RSVD_PAGE_ALIGNED_SIZE;
	xpc_vars = (struct xpc_vars *) next_cl;

	/*
	 * Before clearing xpc_vars, see if a page of AMOs had been previously
	 * allocated. If not we'll need to allocate one and set permissions
	 * so that cross-partition AMOs are allowed.
	 *
	 * The allocated AMO page needs MCA reporting to remain disabled after
	 * XPC has unloaded.  To make this work, we keep a copy of the pointer
	 * to this page (i.e., amos_page) in the struct xpc_vars structure,
	 * which is pointed to by the reserved page, and re-use that saved copy
	 * on subsequent loads of XPC. This AMO page is never freed, and its
	 * memory protections are never restricted.
	 */
	if ((amos_page = xpc_vars->amos_page) == NULL) {
		amos_page = (AMO_t *) mspec_kalloc_page(0);
		if (amos_page == NULL) {
			dev_err(xpc_part, "can't allocate page of AMOs\n");
			return NULL;
		}

		/*
		 * Open up AMO-R/W to cpu.  This is done for Shub 1.1 systems
		 * when xpc_allow_IPI_ops() is called via xpc_hb_init().
		 */
		if (!enable_shub_wars_1_1()) {
			ret = sn_change_memprotect(ia64_tpa((u64) amos_page),
					PAGE_SIZE, SN_MEMPROT_ACCESS_CLASS_1,
					&nasid_array);
			if (ret != 0) {
				dev_err(xpc_part, "can't change memory "
					"protections\n");
				mspec_kfree_page((unsigned long) amos_page);
				return NULL;
			}
		}
	} else if (!IS_AMO_ADDRESS((u64) amos_page)) {
		/*
		 * EFI's XPBOOT can also set amos_page in the reserved page,
		 * but it happens to leave it as an uncached physical address
		 * and we need it to be an uncached virtual, so we'll have to
		 * convert it.
		 */
		if (!IS_AMO_PHYS_ADDRESS((u64) amos_page)) {
			dev_err(xpc_part, "previously used amos_page address "
				"is bad = 0x%p\n", (void *) amos_page);
			return NULL;
		}
		amos_page = (AMO_t *) TO_AMO((u64) amos_page);
	}

	memset(xpc_vars, 0, sizeof(struct xpc_vars));

	/*
	 * Place the XPC per partition specific variables on the cache line
	 * following the XPC variables structure.
	 */
	next_cl += XPC_VARS_ALIGNED_SIZE;
	memset((u64 *) next_cl, 0, sizeof(struct xpc_vars_part) *
							XP_MAX_PARTITIONS);
	xpc_vars_part = (struct xpc_vars_part *) next_cl;
	xpc_vars->vars_part_pa = __pa(next_cl);

	xpc_vars->version = XPC_V_VERSION;
	xpc_vars->act_nasid = cpuid_to_nasid(0);
	xpc_vars->act_phys_cpuid = cpu_physical_id(0);
	xpc_vars->amos_page = amos_page;  /* save for next load of XPC */


	/*
	 * Initialize the activation related AMO variables.
	 */
	xpc_vars->act_amos = xpc_IPI_init(XP_MAX_PARTITIONS);
	for (i = 1; i < XP_NASID_MASK_WORDS; i++) {
		xpc_IPI_init(i + XP_MAX_PARTITIONS);
	}
	/* export AMO page's physical address to other partitions */
	xpc_vars->amos_page_pa = ia64_tpa((u64) xpc_vars->amos_page);

	/*
	 * This signifies to the remote partition that our reserved
	 * page is initialized.
	 */
	(volatile u64) rp->vars_pa = __pa(xpc_vars);

	return rp;
}