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Fri, 9 Jun 2017 11:38:38 +0000 Date: Fri, 9 Jun 2017 11:38:32 +0000 From: Jayachandran C To: Robin Murphy Cc: Geetha sowjanya , will.deacon@arm.com, lorenzo.pieralisi@arm.com, hanjun.guo@linaro.org, sudeep.holla@arm.com, iommu@lists.linux-foundation.org, robh@kernel.org, Charles.Garcia-Tobin@arm.com, Geetha Sowjanya , geethasowjanya.akula@gmail.com, jcm@redhat.com, linu.cherian@cavium.com, rjw@rjwysocki.net, robert.moore@intel.com, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, robert.richter@cavium.com, lv.zheng@intel.com, catalin.marinas@arm.com, sgoutham@cavium.com, linux-arm-kernel@lists.infradead.org, devel@acpica.org Subject: Re: Fwd: [PATCH v7 2/3] iommu/arm-smmu-v3: Add workaround for Cavium ThunderX2 erratum #74 Message-ID: <20170609113832.GB106079@localhost> References: <1496145821-3411-1-git-send-email-gakula@caviumnetworks.com> <1496145821-3411-3-git-send-email-gakula@caviumnetworks.com> <9263562d-03a3-d02e-6b7e-01613a4bd296@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Originating-IP: [50.233.148.156] X-ClientProxiedBy: BN6PR08CA0059.namprd08.prod.outlook.com (10.172.144.21) To CY4PR07MB2999.namprd07.prod.outlook.com (10.172.116.13) X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PR07MB2999: X-MS-Office365-Filtering-Correlation-Id: ca25a522-a541-4f2b-3eaa-08d4af2c143a X-Microsoft-Antispam: UriScan:; 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24:HByDM/jWUiTEwF9INNmKNO7o3fj50yxLRHxQYzO81IpBU/1JUjrKB4hHhcX8sHe8cC8yVBtz9UEN/i8L00j4MeVIDyWA4LbkxcM568kbDuc= SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-Microsoft-Exchange-Diagnostics: 1; CY4PR07MB2999; 7:YYLwhfFLwftYidxV3wtWkcM3I+mIDonPaMdgCmwJsptBWMcCW2r9M5MUp3Rc6TrC+rE2sPu/1rgI9c19jCIdXbT/k1sxLeXw6CqdyuHea6TZg8QS78n3aF59J0asquatAmrDJzNxbgzM4Ad7yXhA3gz6zEAdTD5YCXCZ2YMjBDOOr0mUc239uw5ndgDZrA6qGD1dNnls9o52/9Ig2WB7hO4FdEicon9jsW3X4SMf4CN3p7j5cnvMLVNgK6gIvwE0DfWUM0W6d7XHN8uVh7rlp9eBq9+RFd/uT3BoV3nV/EsNszCxXMmu5ENxJV4+jwbczxjRvEyrgk7JrNs5j0Gb+Q== X-OriginatorOrg: caviumnetworks.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2017 11:38:38.7859 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR07MB2999 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Fri, Jun 09, 2017 Robin Murphy wrote: > > On 30/05/17 13:03, Geetha sowjanya wrote: > > From: Linu Cherian > > > > Cavium ThunderX2 SMMU implementation doesn't support page 1 register space > > and PAGE0_REGS_ONLY option is enabled as an errata workaround. > > This option when turned on, replaces all page 1 offsets used for > > EVTQ_PROD/CONS, PRIQ_PROD/CONS register access with page 0 offsets. > > > > SMMU resource size checks are now based on SMMU option PAGE0_REGS_ONLY, > > since resource size can be either 64k/128k. > > For this, arm_smmu_device_dt_probe/acpi_probe has been moved before > > platform_get_resource call, so that SMMU options are set beforehand. > > > > Signed-off-by: Linu Cherian > > Signed-off-by: Geetha Sowjanya > > --- > > Documentation/arm64/silicon-errata.txt | 1 + > > .../devicetree/bindings/iommu/arm,smmu-v3.txt | 6 ++ > > drivers/iommu/arm-smmu-v3.c | 64 +++++++++++++++----- > > 3 files changed, 56 insertions(+), 15 deletions(-) > > > > diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt > > index 10f2ddd..4693a32 100644 > > --- a/Documentation/arm64/silicon-errata.txt > > +++ b/Documentation/arm64/silicon-errata.txt > > @@ -62,6 +62,7 @@ stable kernels. > > | Cavium | ThunderX GICv3 | #23154 | CAVIUM_ERRATUM_23154 | > > | Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 | > > | Cavium | ThunderX SMMUv2 | #27704 | N/A | > > +| Cavium | ThunderX2 SMMUv3| #74 | N/A | > > | | | | | > > | Freescale/NXP | LS2080A/LS1043A | A-008585 | FSL_ERRATUM_A008585 | > > | | | | | > > diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt > > index be57550..607e270 100644 > > --- a/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt > > +++ b/Documentation/devicetree/bindings/iommu/arm,smmu-v3.txt > > @@ -49,6 +49,12 @@ the PCIe specification. > > - hisilicon,broken-prefetch-cmd > > : Avoid sending CMD_PREFETCH_* commands to the SMMU. > > > > +- cavium,cn9900-broken-page1-regspace > > + : Replaces all page 1 offsets used for EVTQ_PROD/CONS, > > + PRIQ_PROD/CONS register access with page 0 offsets. > > + Set for Caviun ThunderX2 silicon that doesn't support > > + SMMU page1 register space. > > The indentation's a bit funky here - the rest of this file is actually > indented with spaces, but either way it's clear your editor isn't set to > 8-space tabs ;) > > > + > > ** Example > > > > smmu@2b400000 { > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > > index 380969a..4e80205 100644 > > --- a/drivers/iommu/arm-smmu-v3.c > > +++ b/drivers/iommu/arm-smmu-v3.c > > @@ -412,6 +412,9 @@ > > #define MSI_IOVA_BASE 0x8000000 > > #define MSI_IOVA_LENGTH 0x100000 > > > > +#define ARM_SMMU_PAGE0_REGS_ONLY(smmu) \ > > + ((smmu)->options & ARM_SMMU_OPT_PAGE0_REGS_ONLY) > > At the two places we use this macro, frankly I think it would be clearer > to just reference smmu->options directly, as we currently do for > SKIP_PREFETCH. The abstraction also adds more lines than it saves... > > > + > > static bool disable_bypass; > > module_param_named(disable_bypass, disable_bypass, bool, S_IRUGO); > > MODULE_PARM_DESC(disable_bypass, > > @@ -597,6 +600,7 @@ struct arm_smmu_device { > > u32 features; > > > > #define ARM_SMMU_OPT_SKIP_PREFETCH (1 << 0) > > +#define ARM_SMMU_OPT_PAGE0_REGS_ONLY (1 << 1) > > Whitespace again, although this time it's spaces where there should be a > tab. > > > u32 options; > > > > struct arm_smmu_cmdq cmdq; > > @@ -663,9 +667,19 @@ struct arm_smmu_option_prop { > > > > static struct arm_smmu_option_prop arm_smmu_options[] = { > > { ARM_SMMU_OPT_SKIP_PREFETCH, "hisilicon,broken-prefetch-cmd" }, > > + { ARM_SMMU_OPT_PAGE0_REGS_ONLY, "cavium,cn9900-broken-page1-regspace"}, > > { 0, NULL}, > > }; > > > > +static inline void __iomem *arm_smmu_page1_fixup(unsigned long offset, > > + struct arm_smmu_device *smmu) > > +{ > > + if (offset > SZ_64K && ARM_SMMU_PAGE0_REGS_ONLY(smmu)) > > + offset -= SZ_64K; > > + > > + return smmu->base + offset; > > +} > > + > > static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom) > > { > > return container_of(dom, struct arm_smmu_domain, domain); > > @@ -1961,8 +1975,8 @@ static int arm_smmu_init_one_queue(struct arm_smmu_device *smmu, > > return -ENOMEM; > > } > > > > - q->prod_reg = smmu->base + prod_off; > > - q->cons_reg = smmu->base + cons_off; > > + q->prod_reg = arm_smmu_page1_fixup(prod_off, smmu); > > + q->cons_reg = arm_smmu_page1_fixup(cons_off, smmu); > > q->ent_dwords = dwords; > > > > q->q_base = Q_BASE_RWA; > > @@ -2363,8 +2377,10 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) > > > > /* Event queue */ > > writeq_relaxed(smmu->evtq.q.q_base, smmu->base + ARM_SMMU_EVTQ_BASE); > > - writel_relaxed(smmu->evtq.q.prod, smmu->base + ARM_SMMU_EVTQ_PROD); > > - writel_relaxed(smmu->evtq.q.cons, smmu->base + ARM_SMMU_EVTQ_CONS); > > + writel_relaxed(smmu->evtq.q.prod, > > + arm_smmu_page1_fixup(ARM_SMMU_EVTQ_PROD, smmu)); > > + writel_relaxed(smmu->evtq.q.cons, > > + arm_smmu_page1_fixup(ARM_SMMU_EVTQ_CONS, smmu)); This sequence and the arm_smmu_page1_fixup() call is repeated in quite a few places. I think this errata code is messy because the original driver does not make the alias page usage explicit. A patch like the one below (no functional changes) would clean up the original driver and make the errata change much simpler - any comments? -- >8 -- Date: Tue, 30 May 2017 15:43:29 +0000 Subject: [PATCH] iommu: arm-smmu-v3: make alias page usage explicit --- drivers/iommu/arm-smmu-v3.c | 76 +++++++++++++++++++++++++++------------------ 1 file changed, 46 insertions(+), 30 deletions(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 380969a..11fdb4f 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -171,20 +171,19 @@ #define STRTAB_BASE_CFG_FMT_LINEAR (0 << STRTAB_BASE_CFG_FMT_SHIFT) #define STRTAB_BASE_CFG_FMT_2LVL (1 << STRTAB_BASE_CFG_FMT_SHIFT) +#define ARM_SMMU_Q_PROD(qbase) ((qbase) + 0x8) +#define ARM_SMMU_Q_PROD_PAGE1(qbase) ((qbase) + 0x10008) +#define ARM_SMMU_Q_CONS(qbase) ((qbase) + 0xc) +#define ARM_SMMU_Q_CONS_PAGE1(qbase) ((qbase) + 0x1000c) + #define ARM_SMMU_CMDQ_BASE 0x90 -#define ARM_SMMU_CMDQ_PROD 0x98 -#define ARM_SMMU_CMDQ_CONS 0x9c #define ARM_SMMU_EVTQ_BASE 0xa0 -#define ARM_SMMU_EVTQ_PROD 0x100a8 -#define ARM_SMMU_EVTQ_CONS 0x100ac #define ARM_SMMU_EVTQ_IRQ_CFG0 0xb0 #define ARM_SMMU_EVTQ_IRQ_CFG1 0xb8 #define ARM_SMMU_EVTQ_IRQ_CFG2 0xbc #define ARM_SMMU_PRIQ_BASE 0xc0 -#define ARM_SMMU_PRIQ_PROD 0x100c8 -#define ARM_SMMU_PRIQ_CONS 0x100cc #define ARM_SMMU_PRIQ_IRQ_CFG0 0xd0 #define ARM_SMMU_PRIQ_IRQ_CFG1 0xd8 #define ARM_SMMU_PRIQ_IRQ_CFG2 0xdc @@ -1946,11 +1945,30 @@ static struct iommu_ops arm_smmu_ops = { }; /* Probing and initialisation functions */ +static int arm_smmu_reset_one_queue(struct arm_smmu_device *smmu, + struct arm_smmu_queue *q, + unsigned long qoffset, + int page_to_use) +{ + unsigned long prod, cons; + + writeq_relaxed(q->q_base, smmu->base + qoffset); + if (page_to_use == 1) { + prod = ARM_SMMU_Q_PROD_PAGE1(qoffset); + cons = ARM_SMMU_Q_CONS_PAGE1(qoffset); + } else { + prod = ARM_SMMU_Q_PROD(qoffset); + cons = ARM_SMMU_Q_CONS(qoffset); + } + writeq_relaxed(q->prod, smmu->base + prod); + writeq_relaxed(q->cons, smmu->base + cons); +} + static int arm_smmu_init_one_queue(struct arm_smmu_device *smmu, struct arm_smmu_queue *q, - unsigned long prod_off, - unsigned long cons_off, - size_t dwords) + unsigned long qoffset, + size_t dwords, + int page_to_use) { size_t qsz = ((1 << q->max_n_shift) * dwords) << 3; @@ -1961,8 +1979,13 @@ static int arm_smmu_init_one_queue(struct arm_smmu_device *smmu, return -ENOMEM; } - q->prod_reg = smmu->base + prod_off; - q->cons_reg = smmu->base + cons_off; + if (page_to_use == 1) { + q->prod_reg = smmu->base + ARM_SMMU_Q_PROD_PAGE1(qoffset); + q->cons_reg = smmu->base + ARM_SMMU_Q_CONS_PAGE1(qoffset); + } else { + q->prod_reg = smmu->base + ARM_SMMU_Q_PROD(qoffset); + q->cons_reg = smmu->base + ARM_SMMU_Q_CONS(qoffset); + } q->ent_dwords = dwords; q->q_base = Q_BASE_RWA; @@ -1980,14 +2003,14 @@ static int arm_smmu_init_queues(struct arm_smmu_device *smmu) /* cmdq */ spin_lock_init(&smmu->cmdq.lock); - ret = arm_smmu_init_one_queue(smmu, &smmu->cmdq.q, ARM_SMMU_CMDQ_PROD, - ARM_SMMU_CMDQ_CONS, CMDQ_ENT_DWORDS); + ret = arm_smmu_init_one_queue(smmu, &smmu->cmdq.q, ARM_SMMU_CMDQ_BASE, + CMDQ_ENT_DWORDS, 0); if (ret) return ret; /* evtq */ - ret = arm_smmu_init_one_queue(smmu, &smmu->evtq.q, ARM_SMMU_EVTQ_PROD, - ARM_SMMU_EVTQ_CONS, EVTQ_ENT_DWORDS); + ret = arm_smmu_init_one_queue(smmu, &smmu->evtq.q, ARM_SMMU_EVTQ_BASE, + EVTQ_ENT_DWORDS, USE_PAGE1); if (ret) return ret; @@ -1995,8 +2018,8 @@ static int arm_smmu_init_queues(struct arm_smmu_device *smmu) if (!(smmu->features & ARM_SMMU_FEAT_PRI)) return 0; - return arm_smmu_init_one_queue(smmu, &smmu->priq.q, ARM_SMMU_PRIQ_PROD, - ARM_SMMU_PRIQ_CONS, PRIQ_ENT_DWORDS); + return arm_smmu_init_one_queue(smmu, &smmu->priq.q, ARM_SMMU_PRIQ_BASE, + PRIQ_ENT_DWORDS, 1); } static int arm_smmu_init_l1_strtab(struct arm_smmu_device *smmu) @@ -2332,9 +2355,8 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) smmu->base + ARM_SMMU_STRTAB_BASE_CFG); /* Command queue */ - writeq_relaxed(smmu->cmdq.q.q_base, smmu->base + ARM_SMMU_CMDQ_BASE); - writel_relaxed(smmu->cmdq.q.prod, smmu->base + ARM_SMMU_CMDQ_PROD); - writel_relaxed(smmu->cmdq.q.cons, smmu->base + ARM_SMMU_CMDQ_CONS); + arm_smmu_reset_one_queue(smmu, &smmu->evtq.q, + ARM_SMMU_CMDQ_BASE, 0); enables = CR0_CMDQEN; ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0, @@ -2362,9 +2384,8 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) arm_smmu_cmdq_issue_cmd(smmu, &cmd); /* Event queue */ - writeq_relaxed(smmu->evtq.q.q_base, smmu->base + ARM_SMMU_EVTQ_BASE); - writel_relaxed(smmu->evtq.q.prod, smmu->base + ARM_SMMU_EVTQ_PROD); - writel_relaxed(smmu->evtq.q.cons, smmu->base + ARM_SMMU_EVTQ_CONS); + arm_smmu_reset_one_queue(smmu, &smmu->evtq.q, + ARM_SMMU_EVTQ_BASE, 1); enables |= CR0_EVTQEN; ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0, @@ -2376,13 +2397,8 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) /* PRI queue */ if (smmu->features & ARM_SMMU_FEAT_PRI) { - writeq_relaxed(smmu->priq.q.q_base, - smmu->base + ARM_SMMU_PRIQ_BASE); - writel_relaxed(smmu->priq.q.prod, - smmu->base + ARM_SMMU_PRIQ_PROD); - writel_relaxed(smmu->priq.q.cons, - smmu->base + ARM_SMMU_PRIQ_CONS); - + arm_smmu_reset_one_queue(smmu, &smmu->priq.q, + ARM_SMMU_PRIQ_BASE, 1); enables |= CR0_PRIQEN; ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0, ARM_SMMU_CR0ACK);