From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sender3-pp-f112.zoho.com (sender3-pp-f112.zoho.com [136.143.184.112]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C27D23D7CE for ; Thu, 27 Nov 2025 03:50:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.184.112 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764215443; cv=pass; b=PMEUmfpaj19tDfs0rmOg8mE7PY64B/Rh5LFe0p4cSxtc5sS55H0rxP09fhQdru3JxtpB0cB7kHt0Y5az96HuZHnSC0ACPOmblVLzuo1RlJOSJSMoIQsmAx0u5jqYXIoBMXnhUkcBI3SVzBV2U5miK8brloJgJUgWL/sNjELTECE= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764215443; c=relaxed/simple; bh=Jw6MZ73sxQkA+5BhVgBDenWCK5VZqJTv/NhcggIwT0I=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=cg8/R95ppABRfZSKwGQlgqPWFoUcsBnRWmD+ui1g11v38luKSyroE3pE5OecZNKDO3VbXxt1i8Gc9pc3X1L7qwUPFcDGXr82LEKsiSRpBB57VcYCswLG42p75bKBr5NFNhJr4BmUtk1qo7Q3R7lRcfdeUtTP4nEZ6zrVISV7mTo= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (1024-bit key) header.d=collabora.com header.i=adrian.larumbe@collabora.com header.b=hH6BkMUS; arc=pass smtp.client-ip=136.143.184.112 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=collabora.com header.i=adrian.larumbe@collabora.com header.b="hH6BkMUS" ARC-Seal: i=1; a=rsa-sha256; t=1764215431; cv=none; d=zohomail.com; s=zohoarc; b=CA3CYlIgnnaml4ri0fF5D48gstpQjWPHnTzl7mgPh3p917sX7aR670evd9AUawT/HoMU0/Fc8CTKAaNSjJSER3t6TBf+JROrknvqZc9ZIDGKEgPAHKP8kNBX9AIZimK397GsCJ63nok2WfjKaEqAuZIfroix++Q6v9eaC0Ck+zI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1764215431; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To; bh=KE8ziJ8pQkKZVscnMcmu0P6EtgRGkMUzwrL1Yq56MTc=; b=Eq/6SHhDOkTMw6BEhB1f72iA+dkmIGEzIRv/Pu6/TtX11Vnwp13VpjhchfWUkfEoaU8rvAky7rgNW0uMn4jP0VyyQeHRPxbBIUllLdTyNZYpAR6nS6s2+jrqHLuuF0eoSeu1I7pjNm6sPtqdRY3gnMYxzU/K90y9BxBvRUsuBCE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=collabora.com; spf=pass smtp.mailfrom=adrian.larumbe@collabora.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1764215431; s=zohomail; d=collabora.com; i=adrian.larumbe@collabora.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id:Reply-To; bh=KE8ziJ8pQkKZVscnMcmu0P6EtgRGkMUzwrL1Yq56MTc=; b=hH6BkMUS1YaWk+iympSCer6ksoYF6X0nAkxMmMuvzGxPpByB4v7NsIJWwVXEpeYD ay5ttgHUs3JCluuhSjgp9nYnf8wVnVv7hFKVCZ0W33Dvyd3HQqicNTIk6tvTiN0qma3 klZ56XGZRJFY+UfrT3UIAbcpF+lXf/dA3eyFEAPE= Received: by mx.zohomail.com with SMTPS id 1764215430644656.620929946732; Wed, 26 Nov 2025 19:50:30 -0800 (PST) From: =?UTF-8?q?Adri=C3=A1n=20Larumbe?= To: linux-kernel@vger.kernel.org Cc: dri-devel@lists.freedesktop.org, Steven Price , Boris Brezillon , kernel@collabora.com, =?UTF-8?q?Adri=C3=A1n=20Larumbe?= Subject: [PATCH v2 0/1] Workaround for partial huge page unmaps in Panthor Date: Thu, 27 Nov 2025 03:50:12 +0000 Message-ID: <20251127035021.624045-1-adrian.larumbe@collabora.com> X-Mailer: git-send-email 2.51.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This is v2 of [1]. This patch is a workaround for performing partial unmaps of a VM region backed by huge pages. Since these are now disallowed, the patch makes sure unmaps are done on a backing page-granularity, and then regions untouched by the VM_BIND unmap operation are restored. A patch series with IGT tests to validate this functionality is found at [2]. Changelog: v2: - Fixed bug caused by confusion between semantics of gpu_va prev and next ops boundaries and those of the original vma object. - Coalesce all unmap operations into a single one. - Refactored and simplified code. [1] https://lore.kernel.org/dri-devel/20251019032108.3498086-1-adrian.larumbe@collabora.com/ [2] https://lore.kernel.org/igt-dev/20251127030145.585641-1-adrian.larumbe@collabora.com/T/#t Adrián Larumbe (1): drm/panthor: Support partial unmaps of huge pages drivers/gpu/drm/panthor/panthor_mmu.c | 76 +++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) -- 2.51.2