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{ "id": 2234552, "url": "http://patchwork.ozlabs.org/api/1.2/covers/2234552/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/cover/20260507-b4-mmu-unmap-fixes-v3-0-aac7726d87d5@linaro.org/", "project": { "id": 18, "url": "http://patchwork.ozlabs.org/api/1.2/projects/18/?format=api", "name": "U-Boot", "link_name": "uboot", "list_id": "u-boot.lists.denx.de", "list_email": "u-boot@lists.denx.de", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260507-b4-mmu-unmap-fixes-v3-0-aac7726d87d5@linaro.org>", "list_archive_url": null, "date": "2026-05-07T19:58:07", "name": "[v3,0/4] armv8: mmu: fix region unmapping and optimise set_one_region()", "submitter": { "id": 90679, "url": "http://patchwork.ozlabs.org/api/1.2/people/90679/?format=api", "name": "Casey Connolly", "email": "casey.connolly@linaro.org" }, "mbox": "http://patchwork.ozlabs.org/project/uboot/cover/20260507-b4-mmu-unmap-fixes-v3-0-aac7726d87d5@linaro.org/mbox/", "series": [ { "id": 503261, "url": "http://patchwork.ozlabs.org/api/1.2/series/503261/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/list/?series=503261", "date": "2026-05-07T19:58:07", "name": "armv8: mmu: fix region unmapping and optimise set_one_region()", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/503261/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2234552/comments/", "headers": { "Return-Path": "<u-boot-bounces@lists.denx.de>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=VXRsXfwL;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "X-B4-Tracking": "v=1; b=H4sIAAAAAAAC/yXMQQqDMBCF4avIrB1IY6rgVYoLTSbtCEklY0QQ7\n 25qlx+P/x0glJgE+uqARBsLf2NBU1dgP2N8E7IrBq10q56qw8lgCBlzDOOCnncSfPiOlLatNc5\n DCZdE91C61/C35Gkmu/6e4Dwv6BXOQXYAAAA=", "X-Change-ID": "20260507-b4-mmu-unmap-fixes-1f7e02c6c4df", "To": "u-boot@lists.denx.de", "Cc": "Tom Rini <trini@konsulko.com>, Anshul Dalal <anshuld@ti.com>,\n Casey Connolly <casey.connolly@linaro.org>,\n Ilias Apalodimas <ilias.apalodimas@linaro.org>, Dhruva Gole <d-gole@ti.com>,\n Mark Kettenis <kettenis@openbsd.org>,\n Patrice Chotard <patrice.chotard@foss.st.com>,\n Sumit Garg <sumit.garg@kernel.org>", "X-Mailer": "b4 0.16-dev", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=1639;\n i=casey.connolly@linaro.org; h=from:subject:message-id;\n bh=iGFZVImLC/ZOZuR56tXJdvPIBIAUJWQ4EZma5v33BN4=;\n b=owGbwMvMwCFYaeA6f6eBkTjjabUkhsw/727PipljNJP/o/MJH2G7Gu37rNKb4gIubfPmXXDul\n /PvpSLOHaUsDIIcDLJiiiziJ5ZZNq29bK+xfcEFmDmsTCBDGLg4BWAi714w/BWZO2W2ANv83fMT\n 766Uf3O/eErfsjOzV+dE5u1M3lLBeVKbkWGdvIVz759Pu6Y4vIpmFI74KOSsJ9SesLvO4uWP9gN\n bRAoB", "X-Developer-Key": "i=casey.connolly@linaro.org; a=openpgp;\n fpr=83B24DA7FE145076BC38BB250CD904EB673A7C47", "X-BeenThere": "u-boot@lists.denx.de", "X-Mailman-Version": "2.1.39", "Precedence": "list", "List-Id": "U-Boot discussion <u-boot.lists.denx.de>", "List-Unsubscribe": "<https://lists.denx.de/options/u-boot>,\n <mailto:u-boot-request@lists.denx.de?subject=unsubscribe>", "List-Archive": "<https://lists.denx.de/pipermail/u-boot/>", "List-Post": "<mailto:u-boot@lists.denx.de>", "List-Help": "<mailto:u-boot-request@lists.denx.de?subject=help>", "List-Subscribe": "<https://lists.denx.de/listinfo/u-boot>,\n <mailto:u-boot-request@lists.denx.de?subject=subscribe>", "Errors-To": "u-boot-bounces@lists.denx.de", "Sender": "\"U-Boot\" <u-boot-bounces@lists.denx.de>", "X-Virus-Scanned": "clamav-milter 0.103.8 at phobos.denx.de", "X-Virus-Status": "Clean" }, "content": "Currently trying to unmap a region results in slow and largely broken\nbehaviour as we unnecessarily split blocks and manually set thousands of\nindividual 4k pages instead of higher level blocks.\n\nThis series fixes the behaviour of set_one_region() so that it works properly when called to unmap regions. See patch 4 for details.\n\nPatches 1 & 2 improve the existing debug functionality, the pagetable\ndumper will now print most explicitly unmapped regions (since they still\nhave their PA intact), as well as adding a new function which does a\nvery basic software TLB lookup to help with debugging.\n\nPatch 3 de-duplicates some code by moving the loop that always surrounds\nset_one_region() calls into its own function, this also helps with\nreadability in the calling functions.\n\nChanges in v3:\n- Reworked entirely to be correct, v2 would cause unrelated pages to\n get updated too if the region was inside a block.\n- Added additional patches with debugging improvements and code cleanup\n- V2: https://lore.kernel.org/u-boot/20260504183721.646712-1-casey.connolly@linaro.org/\n\n---\nCasey Connolly (4):\n armv8: mmu: add a function to help debug TLB lookups\n armv8: mmu: teach the pagetable dumper to show explicit FAULT maps\n armv8: mmu: commonize the set_one_region() loop\n armv8: mmu: fix and optimise explicitly unmapping regions\n\n arch/arm/cpu/armv8/cache_v8.c | 172 +++++++++++++++++++++++----------------\n arch/arm/include/asm/armv8/mmu.h | 7 ++\n 2 files changed, 107 insertions(+), 72 deletions(-)\n---\nbase-commit: bb0f3eebb3c196d9b6efbbd1e5aa9b16abbb9ad6\n\n// Casey (she/they)" }