From patchwork Thu Jun 27 15:23:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 11019885 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9D6631398 for ; Thu, 27 Jun 2019 15:24:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8C8B22890C for ; Thu, 27 Jun 2019 15:24:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 810002895F; Thu, 27 Jun 2019 15:24:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D50DE289BE for ; Thu, 27 Jun 2019 15:24:29 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hgWF5-0004R3-1B; Thu, 27 Jun 2019 15:23:19 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hgWF3-0004Qd-0d for xen-devel@lists.xenproject.org; Thu, 27 Jun 2019 15:23:17 +0000 X-Inumbo-ID: 7bac5d3f-98ef-11e9-8980-bc764e045a96 Received: from prv1-mh.provo.novell.com (unknown [137.65.248.33]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTPS id 7bac5d3f-98ef-11e9-8980-bc764e045a96; Thu, 27 Jun 2019 15:23:15 +0000 (UTC) Received: from INET-PRV1-MTA by prv1-mh.provo.novell.com with Novell_GroupWise; Thu, 27 Jun 2019 09:23:14 -0600 Message-Id: <5D14DF61020000780023B993@prv1-mh.provo.novell.com> X-Mailer: Novell GroupWise Internet Agent 18.1.1 Date: Thu, 27 Jun 2019 09:23:13 -0600 From: "Jan Beulich" To: "xen-devel" References: <5D024C500200007800237DD8@prv1-mh.provo.novell.com> <5D14DDA6020000780023B96E@prv1-mh.provo.novell.com> In-Reply-To: <5D14DDA6020000780023B96E@prv1-mh.provo.novell.com> Mime-Version: 1.0 Content-Disposition: inline Subject: [Xen-devel] [PATCH v2 09/10] AMD/IOMMU: enable x2APIC mode when available X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , Brian Woods , Suravee Suthikulpanit Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP In order for the CPUs to use x2APIC mode, the IOMMU(s) first need to be switched into suitable state. The post-AP-bringup IRQ affinity adjustment is done also for the non- x2APIC case. Signed-off-by: Jan Beulich Reviewed-by: Andrew Cooper --- v2: Drop cpu_has_cx16 check. Add comment. --- TBD: Instead of the system_state check in iov_enable_xt() the function could also zap its own hook pointer, at which point it could also become __init. This would, however, require that either resume_x2apic() be bound to ignore iommu_enable_x2apic() errors forever, or that iommu_enable_x2apic() be slightly re-arranged to not return -EOPNOTSUPP when finding a NULL hook during resume. --- a/xen/drivers/passthrough/amd/iommu_init.c +++ b/xen/drivers/passthrough/amd/iommu_init.c @@ -834,6 +834,30 @@ static bool_t __init set_iommu_interrupt return 1; } +int iov_adjust_irq_affinities(void) +{ + const struct amd_iommu *iommu; + + if ( !iommu_enabled ) + return 0; + + for_each_amd_iommu ( iommu ) + { + struct irq_desc *desc = irq_to_desc(iommu->msi.irq); + unsigned long flags; + + spin_lock_irqsave(&desc->lock, flags); + if ( iommu->ctrl.int_cap_xt_en ) + set_x2apic_affinity(desc, &cpu_online_map); + else + set_msi_affinity(desc, &cpu_online_map); + spin_unlock_irqrestore(&desc->lock, flags); + } + + return 0; +} +__initcall(iov_adjust_irq_affinities); + /* * Family15h Model 10h-1fh erratum 746 (IOMMU Logging May Stall Translations) * Workaround: @@ -1047,7 +1071,7 @@ static void * __init allocate_ppr_log(st IOMMU_PPR_LOG_DEFAULT_ENTRIES, "PPR Log"); } -static int __init amd_iommu_init_one(struct amd_iommu *iommu) +static int __init amd_iommu_init_one(struct amd_iommu *iommu, bool intr) { if ( allocate_cmd_buffer(iommu) == NULL ) goto error_out; @@ -1058,7 +1082,7 @@ static int __init amd_iommu_init_one(str if ( iommu->features.flds.ppr_sup && !allocate_ppr_log(iommu) ) goto error_out; - if ( !set_iommu_interrupt_handler(iommu) ) + if ( intr && !set_iommu_interrupt_handler(iommu) ) goto error_out; /* To make sure that device_table.buffer has been successfully allocated */ @@ -1285,7 +1309,7 @@ static int __init amd_iommu_prepare_one( return 0; } -int __init amd_iommu_init(void) +int __init amd_iommu_prepare(void) { struct amd_iommu *iommu; int rc = -ENODEV; @@ -1300,9 +1324,14 @@ int __init amd_iommu_init(void) if ( unlikely(acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) ) goto error_out; + /* Have we been here before? */ + if ( ivhd_type ) + return 0; + rc = amd_iommu_get_supported_ivhd_type(); if ( rc < 0 ) goto error_out; + BUG_ON(!rc); ivhd_type = rc; rc = amd_iommu_get_ivrs_dev_entries(); @@ -1321,9 +1350,33 @@ int __init amd_iommu_init(void) } rc = amd_iommu_update_ivrs_mapping_acpi(); + + error_out: + if ( rc ) + { + amd_iommu_init_cleanup(); + ivhd_type = 0; + } + + return rc; +} + +int __init amd_iommu_init(bool xt) +{ + struct amd_iommu *iommu; + int rc = amd_iommu_prepare(); + if ( rc ) goto error_out; + for_each_amd_iommu ( iommu ) + { + /* NB: There's no need to actually write these out right here. */ + iommu->ctrl.ga_en |= xt; + iommu->ctrl.xt_en = xt; + iommu->ctrl.int_cap_xt_en = xt; + } + /* initialize io-apic interrupt remapping entries */ if ( iommu_intremap ) rc = amd_iommu_setup_ioapic_remapping(); @@ -1346,7 +1399,12 @@ int __init amd_iommu_init(void) /* per iommu initialization */ for_each_amd_iommu ( iommu ) { - rc = amd_iommu_init_one(iommu); + /* + * Setting up of the IOMMU interrupts cannot occur yet at the (very + * early) time we get here when enabling x2APIC mode. Suppress it + * here, and do it explicitly in amd_iommu_init_interrupt(). + */ + rc = amd_iommu_init_one(iommu, !xt); if ( rc ) goto error_out; } @@ -1358,6 +1416,40 @@ error_out: return rc; } +int __init amd_iommu_init_interrupt(void) +{ + struct amd_iommu *iommu; + int rc = 0; + + for_each_amd_iommu ( iommu ) + { + struct irq_desc *desc; + + if ( !set_iommu_interrupt_handler(iommu) ) + { + rc = -EIO; + break; + } + + desc = irq_to_desc(iommu->msi.irq); + + spin_lock(&desc->lock); + ASSERT(iommu->ctrl.int_cap_xt_en); + set_x2apic_affinity(desc, &cpu_online_map); + spin_unlock(&desc->lock); + + set_iommu_event_log_control(iommu, IOMMU_CONTROL_ENABLED); + + if ( iommu->features.flds.ppr_sup ) + set_iommu_ppr_log_control(iommu, IOMMU_CONTROL_ENABLED); + } + + if ( rc ) + amd_iommu_init_cleanup(); + + return rc; +} + static void invalidate_all_domain_pages(void) { struct domain *d; --- a/xen/drivers/passthrough/amd/iommu_intr.c +++ b/xen/drivers/passthrough/amd/iommu_intr.c @@ -816,6 +816,40 @@ void* __init amd_iommu_alloc_intremap_ta return tb; } +bool __init iov_supports_xt(void) +{ + unsigned int apic; + struct amd_iommu *iommu; + + if ( !iommu_enable || !iommu_intremap ) + return false; + + if ( amd_iommu_prepare() ) + return false; + + for_each_amd_iommu ( iommu ) + if ( !iommu->features.flds.ga_sup || !iommu->features.flds.xt_sup ) + return false; + + for ( apic = 0; apic < nr_ioapics; apic++ ) + { + unsigned int idx = ioapic_id_to_index(IO_APIC_ID(apic)); + + if ( idx == MAX_IO_APICS ) + return false; + + if ( !find_iommu_for_device(ioapic_sbdf[idx].seg, + ioapic_sbdf[idx].bdf) ) + { + AMD_IOMMU_DEBUG("No IOMMU for IO-APIC %#x (ID %x)\n", + apic, IO_APIC_ID(apic)); + return false; + } + } + + return true; +} + int __init amd_setup_hpet_msi(struct msi_desc *msi_desc) { spinlock_t *lock; --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c @@ -170,7 +170,8 @@ static int __init iov_detect(void) if ( !iommu_enable && !iommu_intremap ) return 0; - if ( amd_iommu_init() != 0 ) + else if ( (init_done ? amd_iommu_init_interrupt() + : amd_iommu_init(false)) != 0 ) { printk("AMD-Vi: Error initialization\n"); return -ENODEV; @@ -183,6 +184,25 @@ static int __init iov_detect(void) return scan_pci_devices(); } +static int iov_enable_xt(void) +{ + int rc; + + if ( system_state >= SYS_STATE_active ) + return 0; + + if ( (rc = amd_iommu_init(true)) != 0 ) + { + printk("AMD-Vi: Error %d initializing for x2APIC mode\n", rc); + /* -ENXIO has special meaning to the caller - convert it. */ + return rc != -ENXIO ? rc : -ENODATA; + } + + init_done = true; + + return 0; +} + int amd_iommu_alloc_root(struct domain_iommu *hd) { if ( unlikely(!hd->arch.root_table) ) @@ -559,11 +579,13 @@ static const struct iommu_ops __initcons .free_page_table = deallocate_page_table, .reassign_device = reassign_device, .get_device_group_id = amd_iommu_group_id, + .enable_x2apic = iov_enable_xt, .update_ire_from_apic = amd_iommu_ioapic_update_ire, .update_ire_from_msi = amd_iommu_msi_msg_update_ire, .read_apic_from_ire = amd_iommu_read_ioapic_from_ire, .read_msi_from_ire = amd_iommu_read_msi_from_ire, .setup_hpet_msi = amd_setup_hpet_msi, + .adjust_irq_affinities = iov_adjust_irq_affinities, .suspend = amd_iommu_suspend, .resume = amd_iommu_resume, .share_p2m = amd_iommu_share_p2m, @@ -574,4 +596,5 @@ static const struct iommu_ops __initcons static const struct iommu_init_ops __initconstrel _iommu_init_ops = { .ops = &_iommu_ops, .setup = iov_detect, + .supports_x2apic = iov_supports_xt, }; --- a/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h +++ b/xen/include/asm-x86/hvm/svm/amd-iommu-proto.h @@ -48,8 +48,11 @@ int amd_iommu_detect_acpi(void); void get_iommu_features(struct amd_iommu *iommu); /* amd-iommu-init functions */ -int amd_iommu_init(void); +int amd_iommu_prepare(void); +int amd_iommu_init(bool xt); +int amd_iommu_init_interrupt(void); int amd_iommu_update_ivrs_mapping_acpi(void); +int iov_adjust_irq_affinities(void); /* mapping functions */ int __must_check amd_iommu_map_page(struct domain *d, dfn_t dfn, @@ -96,6 +99,7 @@ void amd_iommu_flush_all_caches(struct a struct amd_iommu *find_iommu_for_device(int seg, int bdf); /* interrupt remapping */ +bool iov_supports_xt(void); int amd_iommu_setup_ioapic_remapping(void); void *amd_iommu_alloc_intremap_table(unsigned long **); int amd_iommu_free_intremap_table(u16 seg, struct ivrs_mappings *);