From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: [PATCH 6/7] iommu/vt-d: Enable page request interrupt Date: Fri, 09 Oct 2015 00:53:45 +0100 Message-ID: <1444348425.92154.34.camel@infradead.org> References: <1444348223.92154.22.camel@infradead.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1269185295==" Return-path: In-Reply-To: <1444348223.92154.22.camel@infradead.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: iommu@lists.linux-foundation.org, intel-gfx@lists.freedesktop.org, jesse.barnes@intel.com List-Id: iommu@lists.linux-foundation.org --===============1269185295== Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-RrC0ObkGyscIxacCZgaJ" --=-RrC0ObkGyscIxacCZgaJ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Signed-off-by: David Woodhouse --- drivers/iommu/intel-iommu.c | 22 +++++++++++++- drivers/iommu/intel-svm.c | 71 +++++++++++++++++++++++++++++++++++++++++= ++++ include/linux/intel-iommu.h | 5 ++++ 3 files changed, 97 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index b5ab009..e27b9c6 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1687,8 +1687,11 @@ static void free_dmar_iommu(struct intel_iommu *iomm= u) free_context_table(iommu); =20 #ifdef CONFIG_INTEL_IOMMU_SVM - if (pasid_enabled(iommu)) + if (pasid_enabled(iommu)) { + if (ecap_prs(iommu->ecap)) + intel_svm_finish_prq(iommu); intel_svm_free_pasid_tables(iommu); + } #endif } =20 @@ -3204,6 +3207,13 @@ domains_done: =20 iommu_flush_write_buffer(iommu); =20 +#ifdef CONFIG_INTEL_IOMMU_SVM + if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) { + ret =3D intel_svm_enable_prq(iommu); + if (ret) + goto free_iommu; + } +#endif ret =3D dmar_set_interrupt(iommu); if (ret) goto free_iommu; @@ -4148,6 +4158,14 @@ static int intel_iommu_add(struct dmar_drhd_unit *dm= aru) =20 intel_iommu_init_qi(iommu); iommu_flush_write_buffer(iommu); + +#ifdef CONFIG_INTEL_IOMMU_SVM + if (pasid_enabled(iommu) && ecap_prs(iommu->ecap)) { + ret =3D intel_svm_enable_prq(iommu); + if (ret) + goto disable_iommu; + } +#endif ret =3D dmar_set_interrupt(iommu); if (ret) goto disable_iommu; @@ -4952,6 +4970,8 @@ int intel_iommu_enable_pasid(struct intel_svm *svm) ctx_lo |=3D CONTEXT_TT_PT_PASID << 2; } ctx_lo |=3D CONTEXT_PASIDE; + if (svm->dev_iotlb && ecap_prs(svm->iommu->ecap)) + ctx_lo |=3D CONTEXT_PRS; context[0].lo =3D ctx_lo; wmb(); svm->iommu->flush.flush_context(svm->iommu, svm->did, diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index 913c3a1..1260e87 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -18,6 +18,10 @@ #include #include #include +#include +#include + +static irqreturn_t prq_event_thread(int irq, void *d); =20 struct pasid_entry { u64 val; @@ -75,6 +79,65 @@ int intel_svm_free_pasid_tables(struct intel_iommu *iomm= u) return 0; } =20 +#define PRQ_ORDER 0 +int intel_svm_enable_prq(struct intel_iommu *iommu) +{ + struct page *pages; + int irq, ret; + + pages =3D alloc_pages(GFP_KERNEL | __GFP_ZERO, PRQ_ORDER); + if (!pages) { + pr_warn("IOMMU: %s: Failed to allocate page request queue\n", + iommu->name); + return -ENOMEM; + } + iommu->prq =3D page_address(pages); + + irq =3D dmar_alloc_hwirq(DMAR_UNITS_SUPPORTED + iommu->seq_id, iommu->nod= e, iommu); + if (irq <=3D 0) { + pr_err("IOMMU: %s: Failed to create IRQ vector for page request queue\n"= , + iommu->name); + ret =3D -EINVAL; + err: + free_pages((unsigned long)iommu->prq, PRQ_ORDER); + iommu->prq =3D 0; + return ret; + } + iommu->pr_irq =3D irq; + + snprintf(iommu->prq_name, sizeof(iommu->prq_name), "dmar%d-prq", iommu->s= eq_id); + + ret =3D request_threaded_irq(irq, NULL, prq_event_thread, IRQF_ONESHOT, + iommu->prq_name, iommu); + if (ret) { + pr_err("IOMMU: %s: Failed to request IRQ for page request queue\n", + iommu->name); + dmar_free_hwirq(irq); + goto err; + } + dmar_writeq(iommu->reg + DMAR_PQH_REG, 0ULL); + dmar_writeq(iommu->reg + DMAR_PQT_REG, 0ULL); + dmar_writeq(iommu->reg + DMAR_PQA_REG, virt_to_phys(iommu->prq) | PRQ_ORD= ER); + + return 0; +} + +int intel_svm_finish_prq(struct intel_iommu *iommu) +{ + dmar_writeq(iommu->reg + DMAR_PQH_REG, 0ULL); + dmar_writeq(iommu->reg + DMAR_PQT_REG, 0ULL); + dmar_writeq(iommu->reg + DMAR_PQA_REG, 0ULL); + + free_irq(iommu->pr_irq, iommu); + dmar_free_hwirq(iommu->pr_irq); + iommu->pr_irq =3D 0; + + free_pages((unsigned long)iommu->prq, PRQ_ORDER); + iommu->prq =3D 0; + + return 0; +} + static void intel_flush_svm_range(struct intel_svm *svm, unsigned long address, int pages, int ih) { @@ -292,3 +355,11 @@ int intel_svm_unbind_mm(struct device *dev, int pasid) return ret; } EXPORT_SYMBOL_GPL(intel_svm_unbind_mm); + + +static irqreturn_t prq_event_thread(int irq, void *d) +{ + struct intel_iommu *iommu =3D d; + printk("PRQ event on %s\n", iommu->name); + return IRQ_HANDLED; +} diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 564a61b..bf034b0 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -370,6 +370,7 @@ enum { =20 struct pasid_entry; struct pasid_state_entry; +struct page_req_dsc; =20 struct intel_iommu { void __iomem *reg; /* Pointer to hardware regs, virtual addr */ @@ -402,6 +403,8 @@ struct intel_iommu { * told to. But while it's all driver-arbitrated, we're fine. */ struct pasid_entry *pasid_table; struct pasid_state_entry *pasid_state_table; + struct page_req_dsc *prq; + unsigned char prq_name[16]; /* Name for PRQ interrupt */ struct idr pasid_idr; #endif struct q_inval *qi; /* Queued invalidation info */ @@ -445,6 +448,8 @@ extern int dmar_ir_support(void); =20 extern int intel_svm_alloc_pasid_tables(struct intel_iommu *iommu); extern int intel_svm_free_pasid_tables(struct intel_iommu *iommu); +extern int intel_svm_enable_prq(struct intel_iommu *iommu); +extern int intel_svm_finish_prq(struct intel_iommu *iommu); =20 struct intel_svm { struct kref kref; --=20 2.4.3 --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-RrC0ObkGyscIxacCZgaJ Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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