From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
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
Date: Thu, 5 Aug 2021 17:03:19 +0100 [thread overview]
Message-ID: <20210805160319.GB23085@lpieralisi> (raw)
In-Reply-To: <20210805080724.480-3-shameerali.kolothum.thodi@huawei.com>
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
>
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next prev parent reply other threads:[~2021-08-05 16:05 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-05 8:07 [PATCH v7 0/9] ACPI/IORT: Support for IORT RMR node Shameer Kolothum
2021-08-05 8:07 ` [PATCH v7 1/9] iommu: Introduce a union to struct iommu_resv_region Shameer Kolothum
2021-08-20 10:22 ` Steven Price
2021-10-08 12:14 ` Robin Murphy
2021-10-09 6:57 ` Jon Nettleton
2021-10-11 5:47 ` Shameerali Kolothum Thodi
2021-10-11 13:47 ` Robin Murphy
2021-08-05 8:07 ` [PATCH v7 2/9] ACPI/IORT: Add support for RMR node parsing Shameer Kolothum
2021-08-05 16:03 ` Lorenzo Pieralisi [this message]
2021-08-05 16:31 ` Jon Nettleton
2021-08-05 18:37 ` Laurentiu Tudor
2021-09-06 17:44 ` Robin Murphy
2021-09-06 19:51 ` Jon Nettleton
2021-09-16 7:26 ` Shameerali Kolothum Thodi
2021-09-16 7:52 ` Jon Nettleton
2021-09-16 8:26 ` Shameerali Kolothum Thodi
2021-09-16 11:16 ` Jon Nettleton
2021-09-17 11:26 ` Shameerali Kolothum Thodi
2021-10-05 10:53 ` Laurentiu Tudor
2021-10-08 12:48 ` Robin Murphy
2021-10-09 7:06 ` Jon Nettleton
2021-10-11 14:04 ` Robin Murphy
2021-10-12 8:00 ` Jon Nettleton
2021-12-08 12:18 ` Lorenzo Pieralisi
2021-12-08 13:26 ` Jon Nettleton
2021-12-08 14:37 ` Robin Murphy
2021-12-08 15:11 ` Jon Nettleton
2021-10-11 5:59 ` Shameerali Kolothum Thodi
2021-08-05 8:07 ` [PATCH v7 3/9] iommu/dma: Introduce generic helper to retrieve RMR info Shameer Kolothum
2021-10-08 13:03 ` Robin Murphy
2021-10-11 5:51 ` Shameerali Kolothum Thodi
2021-08-05 8:07 ` [PATCH v7 4/9] ACPI/IORT: Add a helper to retrieve RMR memory regions Shameer Kolothum
2021-08-05 15:43 ` Lorenzo Pieralisi
2021-08-05 8:07 ` [PATCH v7 5/9] iommu/arm-smmu-v3: Introduce strtab init helper Shameer Kolothum
2021-08-05 8:07 ` [PATCH v7 6/9] iommu/arm-smmu-v3: Refactor arm_smmu_init_bypass_stes() to force bypass Shameer Kolothum
2021-08-05 8:07 ` [PATCH v7 7/9] iommu/arm-smmu-v3: Get associated RMR info and install bypass STE Shameer Kolothum
2021-08-05 8:07 ` [PATCH v7 8/9] iommu/arm-smmu: Get associated RMR info and install bypass SMR Shameer Kolothum
2021-08-05 8:07 ` [PATCH v7 9/9] iommu/dma: Reserve any RMR regions associated with a dev Shameer Kolothum
2021-10-08 13:09 ` Robin Murphy
2021-10-09 7:07 ` Jon Nettleton
2021-10-11 15:00 ` Robin Murphy
2021-10-11 15:42 ` Shameerali Kolothum Thodi
2021-08-05 13:22 ` [PATCH v7 0/9] ACPI/IORT: Support for IORT RMR node Ard Biesheuvel
2021-08-05 13:35 ` Shameerali Kolothum Thodi
2021-08-05 14:09 ` Ard Biesheuvel
2021-08-31 5:06 ` Jon Nettleton
2021-09-30 9:47 ` Eric Auger
2021-09-30 10:50 ` Shameerali Kolothum Thodi
2022-01-25 13:00 ` Shameerali Kolothum Thodi
2022-01-25 19:30 ` Robin Murphy
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