From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sender4-pp-f112.zoho.com (sender4-pp-f112.zoho.com [136.143.188.112]) (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 4EFF6146A66 for ; Sat, 13 Dec 2025 19:09:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.112 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765652943; cv=pass; b=MrZ7XFIakPobjgHhEm4Owepj7c1mZdKC3kKLTyD5/xT2/5Mf8lQkdaiWUwBf0KwmFteFIrwmDw7rXOkFLiZGk+UXXzJynI0RB1xbc1bNUnSJWN8s4Qd3G+S8ZwWZLkaHr3ZYe2b0QN9vQuIN+j8MgASStrl7pU1EGG7BLbExM04= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765652943; c=relaxed/simple; bh=pMBgkICG2UuR8T1vBZqFh77trv3SOWwlLuhVbNjm2nc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=ADjwtjLp+BhIUvlLtFOjKhnIALBeMQbyY/elK3bjXERnFz1HC3J3kMwpkeB7AkknBBaM4XrLbjNUdHUf/ikAio52rqdh4W3Q1JcEc7xUvymr2dZssw1Y/2CPAoLalp2C0QDKeS0rmNYR0zj9vPjoNMQvUtpANlUadNJfsFM0UHY= 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=WCluVfKS; arc=pass smtp.client-ip=136.143.188.112 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="WCluVfKS" ARC-Seal: i=1; a=rsa-sha256; t=1765652935; cv=none; d=zohomail.com; s=zohoarc; b=Ln1YyVH/FQIG4t16Zz1BXDd0x2eHKAx7VPnQPsxsxZXsnA3/UN9bniiPbkRChaG3bHm0E04ZG5343NWwNbPc+fS4j3RF2DB28hIrGTTiffVFj1tzFlQ+UwbYvk5yO7rufACiY1DovVI5iQBwyBs5yVKGmsND5M5chgOR0bwEst4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1765652935; 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=QreqcUmbJuLRfMDwkHbguOG5L8Fq9oShdDpbsW6V7xU=; b=DdA/A+svLAEo9X305pkzXY9OScHJ6Y/Cx9riTJr1fhZ4JvpIUEI7MCNxER8yiR3R9k3/4BOdRyhfvL1rDCoYSXIqH40cZNoSA1wx+oJlt3UwFuNKh6shEfy6UmNbkN+BVDpsnkGgJezukjJDqyk3Ndhd+76UxyU0ZBLBwAe2ZDg= 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=1765652935; 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=QreqcUmbJuLRfMDwkHbguOG5L8Fq9oShdDpbsW6V7xU=; b=WCluVfKSKPMkgd7uL+0k84AihAkWvwqdjwSk9pkzep52Ay5KcMLe8vY7MwVttLFu hzOsSAGLsC3T09O7VTnTHF07QjSfyROpupO8UvPbjR65rKe8Su0F22j+fxRQB6wxZtQ 1srh4HWMWE0RDI1B/7HS90iwtJCEndiy8JQq7pLk= Received: by mx.zohomail.com with SMTPS id 1765652933492827.0707613508447; Sat, 13 Dec 2025 11:08:53 -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 v3 0/1] Workaround for partial huge page unmaps in Panthor Date: Sat, 13 Dec 2025 19:08:32 +0000 Message-ID: <20251213190835.2444075-1-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 v3 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: v3: - Reworked address logic so that prev and next gpuava_op's va's are used in the calculations instead of those of the original unmap vma. - Got rid of the return struct from get_map_unmap_intervals() and now reckon panthor_vm_map_pages() arguments by fiddlign with the gpuva's respective gem object offsets. - Use folio_size() instead of folio_order() because the latter implies page sizes from the CPU's MMU perspective, rather than that of the GPU. 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/20251127035021.624045-1-adrian.larumbe@collabora.com/ [2] https://lore.kernel.org/igt-dev/20251213190205.2435793-1-adrian.larumbe@collabora.com/T/#t Adrián Larumbe (1): drm/panthor: Support partial unmaps of huge pages drivers/gpu/drm/panthor/panthor_mmu.c | 66 +++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) -- 2.51.2