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Thu, 05 Aug 2021 16:03:31 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mBfq8-00ACUy-WE for linux-arm-kernel@lists.infradead.org; Thu, 05 Aug 2021 16:03:26 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 354FD31B; Thu, 5 Aug 2021 09:03:24 -0700 (PDT) Received: from lpieralisi (e121166-lin.cambridge.arm.com [10.1.196.255]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 481C93F66F; Thu, 5 Aug 2021 09:03:22 -0700 (PDT) Date: Thu, 5 Aug 2021 17:03:19 +0100 From: Lorenzo Pieralisi To: Shameer Kolothum Cc: linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, iommu@lists.linux-foundation.org, linuxarm@huawei.com, joro@8bytes.org, robin.murphy@arm.com, will@kernel.org, wanghuiqiang@huawei.com, guohanjun@huawei.com, steven.price@arm.com, Sami.Mujawar@arm.com, jon@solid-run.com, eric.auger@redhat.com, yangyicong@huawei.com Subject: Re: [PATCH v7 2/9] ACPI/IORT: Add support for RMR node parsing Message-ID: <20210805160319.GB23085@lpieralisi> References: <20210805080724.480-1-shameerali.kolothum.thodi@huawei.com> <20210805080724.480-3-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210805080724.480-3-shameerali.kolothum.thodi@huawei.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210805_090325_194141_75BF2D74 X-CRM114-Status: GOOD ( 21.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 05, 2021 at 09:07:17AM +0100, Shameer Kolothum wrote: [...] > +static void __init iort_node_get_rmr_info(struct acpi_iort_node *iort_node) > +{ > + struct acpi_iort_node *smmu; > + struct acpi_iort_rmr *rmr; > + struct acpi_iort_rmr_desc *rmr_desc; > + u32 map_count = iort_node->mapping_count; > + u32 sid; > + int i; > + > + if (!iort_node->mapping_offset || map_count != 1) { > + pr_err(FW_BUG "Invalid ID mapping, skipping RMR node %p\n", > + iort_node); > + return; > + } > + > + /* Retrieve associated smmu and stream id */ > + smmu = iort_node_get_id(iort_node, &sid, 0); > + if (!smmu) { > + pr_err(FW_BUG "Invalid SMMU reference, skipping RMR node %p\n", > + iort_node); > + return; > + } > + > + /* Retrieve RMR data */ > + rmr = (struct acpi_iort_rmr *)iort_node->node_data; > + if (!rmr->rmr_offset || !rmr->rmr_count) { > + pr_err(FW_BUG "Invalid RMR descriptor array, skipping RMR node %p\n", > + iort_node); > + return; > + } > + > + rmr_desc = ACPI_ADD_PTR(struct acpi_iort_rmr_desc, iort_node, > + rmr->rmr_offset); > + > + iort_rmr_desc_check_overlap(rmr_desc, rmr->rmr_count); > + > + for (i = 0; i < rmr->rmr_count; i++, rmr_desc++) { > + struct iommu_resv_region *region; > + enum iommu_resv_type type; > + int prot = IOMMU_READ | IOMMU_WRITE; > + u64 addr = rmr_desc->base_address, size = rmr_desc->length; > + > + if (!IS_ALIGNED(addr, SZ_64K) || !IS_ALIGNED(size, SZ_64K)) { > + /* PAGE align base addr and size */ > + addr &= PAGE_MASK; > + size = PAGE_ALIGN(size + offset_in_page(rmr_desc->base_address)); > + > + pr_err(FW_BUG "RMR descriptor[0x%llx - 0x%llx] not aligned to 64K, continue with [0x%llx - 0x%llx]\n", > + rmr_desc->base_address, > + rmr_desc->base_address + rmr_desc->length - 1, > + addr, addr + size - 1); > + } > + if (rmr->flags & IOMMU_RMR_REMAP_PERMITTED) { > + type = IOMMU_RESV_DIRECT_RELAXABLE; > + /* > + * Set IOMMU_CACHE as IOMMU_RESV_DIRECT_RELAXABLE is > + * normally used for allocated system memory that is > + * then used for device specific reserved regions. > + */ > + prot |= IOMMU_CACHE; > + } else { > + type = IOMMU_RESV_DIRECT; > + /* > + * Set IOMMU_MMIO as IOMMU_RESV_DIRECT is normally used > + * for device memory like MSI doorbell. > + */ > + prot |= IOMMU_MMIO; > + } On the prot value assignment based on the remapping flag, I'd like to hear Robin/Joerg's opinion, I'd avoid being in a situation where "normally" this would work but then we have to quirk it. Is this a valid assumption _always_ ? Thanks, Lorenzo > + > + region = iommu_alloc_resv_region(addr, size, prot, type); > + if (region) { > + region->fw_data.rmr.flags = rmr->flags; > + region->fw_data.rmr.sid = sid; > + region->fw_data.rmr.smmu = smmu; > + list_add_tail(®ion->list, &iort_rmr_list); > + } > + } > +} > + > +static void __init iort_parse_rmr(void) > +{ > + struct acpi_iort_node *iort_node, *iort_end; > + struct acpi_table_iort *iort; > + int i; > + > + if (iort_table->revision < 3) > + return; > + > + iort = (struct acpi_table_iort *)iort_table; > + > + iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort, > + iort->node_offset); > + iort_end = ACPI_ADD_PTR(struct acpi_iort_node, iort, > + iort_table->length); > + > + for (i = 0; i < iort->node_count; i++) { > + if (WARN_TAINT(iort_node >= iort_end, TAINT_FIRMWARE_WORKAROUND, > + "IORT node pointer overflows, bad table!\n")) > + return; > + > + if (iort_node->type == ACPI_IORT_NODE_RMR) > + iort_node_get_rmr_info(iort_node); > + > + iort_node = ACPI_ADD_PTR(struct acpi_iort_node, iort_node, > + iort_node->length); > + } > +} > > static void __init iort_init_platform_devices(void) > { > @@ -1636,6 +1767,7 @@ void __init acpi_iort_init(void) > } > > iort_init_platform_devices(); > + iort_parse_rmr(); > } > > #ifdef CONFIG_ZONE_DMA > -- > 2.17.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel