From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9A0FC33CA3 for ; Fri, 10 Jan 2020 15:29:14 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7EDB52072E for ; Fri, 10 Jan 2020 15:29:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="IuluGIuM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7EDB52072E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 7389A86B98; Fri, 10 Jan 2020 15:29:14 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id l89li42gU_U3; Fri, 10 Jan 2020 15:29:13 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 8B0DE86B8A; Fri, 10 Jan 2020 15:29:13 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 79D11C1D7D; Fri, 10 Jan 2020 15:29:13 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id E5CBFC0881 for ; Fri, 10 Jan 2020 15:29:10 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id D1C2786B8A for ; Fri, 10 Jan 2020 15:29:10 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hxpzFoiuuPwf for ; Fri, 10 Jan 2020 15:29:10 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by fraxinus.osuosl.org (Postfix) with ESMTPS id 5415686B20 for ; Fri, 10 Jan 2020 15:29:10 +0000 (UTC) Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1C48520838; Fri, 10 Jan 2020 15:29:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578670150; bh=zEcoifwPRLpUwD79hOwKhG2fIUr/tFaxzoSXmIqLENA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IuluGIuM5g0ZWSgXUMY8OBw8o2FKfYT5jtA9RmW5Q1VBOaOjO2Dl9+kvWmyN/jk+5 qeAvWIujAAXSA2sj2VIk2k1qqWRbMK3IXvR5bfEJWiObYVKZCM9WUNc8kJ2Koc11oy kpkqFAuOhixYnEUY8iI49uITHa+ZYE+5ZPrXZ1kY= From: Will Deacon To: iommu@lists.linux-foundation.org Subject: [PATCH 8/8] iommu/io-pgtable-arm: Prepare for TTBR1 usage Date: Fri, 10 Jan 2020 15:28:52 +0000 Message-Id: <20200110152852.24259-9-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200110152852.24259-1-will@kernel.org> References: <20200110152852.24259-1-will@kernel.org> MIME-Version: 1.0 Cc: Will Deacon , kernel-team@android.com, Robin Murphy , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" From: Robin Murphy Now that we can correctly extract top-level indices without relying on the remaining upper bits being zero, the only remaining impediments to using a given table for TTBR1 are the address validation on map/unmap and the awkward TCR translation granule format. Add a quirk so that we can do the right thing at those points. Tested-by: Jordan Crouse Signed-off-by: Robin Murphy Signed-off-by: Will Deacon --- drivers/iommu/io-pgtable-arm.c | 25 +++++++++++++++++++------ include/linux/io-pgtable.h | 4 ++++ 2 files changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 846963c87e0f..5e966ef0bacf 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -104,6 +104,10 @@ #define ARM_LPAE_TCR_TG0_64K 1 #define ARM_LPAE_TCR_TG0_16K 2 +#define ARM_LPAE_TCR_TG1_16K 1 +#define ARM_LPAE_TCR_TG1_4K 2 +#define ARM_LPAE_TCR_TG1_64K 3 + #define ARM_LPAE_TCR_SH_NS 0 #define ARM_LPAE_TCR_SH_OS 2 #define ARM_LPAE_TCR_SH_IS 3 @@ -463,6 +467,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, arm_lpae_iopte *ptep = data->pgd; int ret, lvl = data->start_level; arm_lpae_iopte prot; + long iaext = (long)iova >> cfg->ias; /* If no access, then nothing to do */ if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) @@ -471,7 +476,9 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return -EINVAL; - if (WARN_ON(iova >> data->iop.cfg.ias || paddr >> data->iop.cfg.oas)) + if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1) + iaext = ~iaext; + if (WARN_ON(iaext || paddr >> cfg->oas)) return -ERANGE; prot = arm_lpae_prot_to_pte(data, iommu_prot); @@ -637,11 +644,14 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); struct io_pgtable_cfg *cfg = &data->iop.cfg; arm_lpae_iopte *ptep = data->pgd; + long iaext = (long)iova >> cfg->ias; if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return 0; - if (WARN_ON(iova >> data->iop.cfg.ias)) + if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1) + iaext = ~iaext; + if (WARN_ON(iaext)) return 0; return __arm_lpae_unmap(data, gather, iova, size, data->start_level, ptep); @@ -777,9 +787,11 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) u64 reg; struct arm_lpae_io_pgtable *data; typeof(&cfg->arm_lpae_s1_cfg.tcr) tcr = &cfg->arm_lpae_s1_cfg.tcr; + bool tg1; if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | - IO_PGTABLE_QUIRK_NON_STRICT)) + IO_PGTABLE_QUIRK_NON_STRICT | + IO_PGTABLE_QUIRK_ARM_TTBR1)) return NULL; data = arm_lpae_alloc_pgtable(cfg); @@ -797,15 +809,16 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) tcr->orgn = ARM_LPAE_TCR_RGN_NC; } + tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1; switch (ARM_LPAE_GRANULE(data)) { case SZ_4K: - tcr->tg = ARM_LPAE_TCR_TG0_4K; + tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_4K : ARM_LPAE_TCR_TG0_4K; break; case SZ_16K: - tcr->tg = ARM_LPAE_TCR_TG0_16K; + tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_16K : ARM_LPAE_TCR_TG0_16K; break; case SZ_64K: - tcr->tg = ARM_LPAE_TCR_TG0_64K; + tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_64K : ARM_LPAE_TCR_TG0_64K; break; } diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index 40c1b7745fb6..53d53c6c2be9 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -83,12 +83,16 @@ struct io_pgtable_cfg { * IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs * on unmap, for DMA domains using the flush queue mechanism for * delayed invalidation. + * + * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table + * for use in the upper half of a split address space. */ #define IO_PGTABLE_QUIRK_ARM_NS BIT(0) #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1) #define IO_PGTABLE_QUIRK_TLBI_ON_MAP BIT(2) #define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3) #define IO_PGTABLE_QUIRK_NON_STRICT BIT(4) + #define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5) unsigned long quirks; unsigned long pgsize_bitmap; unsigned int ias; -- 2.25.0.rc1.283.g88dfdc4193-goog _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDDB8C282DD for ; Fri, 10 Jan 2020 15:31:24 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8E9412077C for ; Fri, 10 Jan 2020 15:31:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gRPDAOL8"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="IuluGIuM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8E9412077C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=TgRd66zcVQa+1nQvoP43GkbC8gIrrqyNU8MRtXNFVKQ=; b=gRPDAOL8bGdCPC Kt37sOarBlM8SD1po9gFXvynWRPmhiKGlSiRdWqci7xQxhCk8Ctkfiux94jX1qx82AIzM3wKxNSxc 9EyDIumPudWnTDwkp0mi5r8CXwj4v1fEvl0emYij/SyuQlUzaiCIlzjvvEZM3IDOZ9ZhR7Y4gTWN7 oR59oUuZXoGkJcsopzyG+AcmNA6MTqV78Nl/9mxO3o5aeoLy74wgbAanYmCrn9UBK80w6GAVTB9iM M9ohXAcAuerlCr4cv8slGOVXq0jWVKgEWn7LlQok6FQayK9gk7o2vCi9hlVIRX1LU2ACpjJk9nW33 4xXkK/oHZ/TzUP7CUcLQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ipwFw-0004UP-1w; Fri, 10 Jan 2020 15:31:24 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ipwDn-0001OV-Fr for linux-arm-kernel@lists.infradead.org; Fri, 10 Jan 2020 15:29:15 +0000 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1C48520838; Fri, 10 Jan 2020 15:29:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578670150; bh=zEcoifwPRLpUwD79hOwKhG2fIUr/tFaxzoSXmIqLENA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IuluGIuM5g0ZWSgXUMY8OBw8o2FKfYT5jtA9RmW5Q1VBOaOjO2Dl9+kvWmyN/jk+5 qeAvWIujAAXSA2sj2VIk2k1qqWRbMK3IXvR5bfEJWiObYVKZCM9WUNc8kJ2Koc11oy kpkqFAuOhixYnEUY8iI49uITHa+ZYE+5ZPrXZ1kY= From: Will Deacon To: iommu@lists.linux-foundation.org Subject: [PATCH 8/8] iommu/io-pgtable-arm: Prepare for TTBR1 usage Date: Fri, 10 Jan 2020 15:28:52 +0000 Message-Id: <20200110152852.24259-9-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200110152852.24259-1-will@kernel.org> References: <20200110152852.24259-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200110_072911_698442_2A28BA42 X-CRM114-Status: GOOD ( 15.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Will Deacon , Jordan Crouse , kernel-team@android.com, Robin Murphy , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Robin Murphy Now that we can correctly extract top-level indices without relying on the remaining upper bits being zero, the only remaining impediments to using a given table for TTBR1 are the address validation on map/unmap and the awkward TCR translation granule format. Add a quirk so that we can do the right thing at those points. Tested-by: Jordan Crouse Signed-off-by: Robin Murphy Signed-off-by: Will Deacon --- drivers/iommu/io-pgtable-arm.c | 25 +++++++++++++++++++------ include/linux/io-pgtable.h | 4 ++++ 2 files changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 846963c87e0f..5e966ef0bacf 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -104,6 +104,10 @@ #define ARM_LPAE_TCR_TG0_64K 1 #define ARM_LPAE_TCR_TG0_16K 2 +#define ARM_LPAE_TCR_TG1_16K 1 +#define ARM_LPAE_TCR_TG1_4K 2 +#define ARM_LPAE_TCR_TG1_64K 3 + #define ARM_LPAE_TCR_SH_NS 0 #define ARM_LPAE_TCR_SH_OS 2 #define ARM_LPAE_TCR_SH_IS 3 @@ -463,6 +467,7 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, arm_lpae_iopte *ptep = data->pgd; int ret, lvl = data->start_level; arm_lpae_iopte prot; + long iaext = (long)iova >> cfg->ias; /* If no access, then nothing to do */ if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE))) @@ -471,7 +476,9 @@ static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova, if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return -EINVAL; - if (WARN_ON(iova >> data->iop.cfg.ias || paddr >> data->iop.cfg.oas)) + if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1) + iaext = ~iaext; + if (WARN_ON(iaext || paddr >> cfg->oas)) return -ERANGE; prot = arm_lpae_prot_to_pte(data, iommu_prot); @@ -637,11 +644,14 @@ static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova, struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops); struct io_pgtable_cfg *cfg = &data->iop.cfg; arm_lpae_iopte *ptep = data->pgd; + long iaext = (long)iova >> cfg->ias; if (WARN_ON(!size || (size & cfg->pgsize_bitmap) != size)) return 0; - if (WARN_ON(iova >> data->iop.cfg.ias)) + if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1) + iaext = ~iaext; + if (WARN_ON(iaext)) return 0; return __arm_lpae_unmap(data, gather, iova, size, data->start_level, ptep); @@ -777,9 +787,11 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) u64 reg; struct arm_lpae_io_pgtable *data; typeof(&cfg->arm_lpae_s1_cfg.tcr) tcr = &cfg->arm_lpae_s1_cfg.tcr; + bool tg1; if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS | - IO_PGTABLE_QUIRK_NON_STRICT)) + IO_PGTABLE_QUIRK_NON_STRICT | + IO_PGTABLE_QUIRK_ARM_TTBR1)) return NULL; data = arm_lpae_alloc_pgtable(cfg); @@ -797,15 +809,16 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie) tcr->orgn = ARM_LPAE_TCR_RGN_NC; } + tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1; switch (ARM_LPAE_GRANULE(data)) { case SZ_4K: - tcr->tg = ARM_LPAE_TCR_TG0_4K; + tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_4K : ARM_LPAE_TCR_TG0_4K; break; case SZ_16K: - tcr->tg = ARM_LPAE_TCR_TG0_16K; + tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_16K : ARM_LPAE_TCR_TG0_16K; break; case SZ_64K: - tcr->tg = ARM_LPAE_TCR_TG0_64K; + tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_64K : ARM_LPAE_TCR_TG0_64K; break; } diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index 40c1b7745fb6..53d53c6c2be9 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -83,12 +83,16 @@ struct io_pgtable_cfg { * IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs * on unmap, for DMA domains using the flush queue mechanism for * delayed invalidation. + * + * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table + * for use in the upper half of a split address space. */ #define IO_PGTABLE_QUIRK_ARM_NS BIT(0) #define IO_PGTABLE_QUIRK_NO_PERMS BIT(1) #define IO_PGTABLE_QUIRK_TLBI_ON_MAP BIT(2) #define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3) #define IO_PGTABLE_QUIRK_NON_STRICT BIT(4) + #define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5) unsigned long quirks; unsigned long pgsize_bitmap; unsigned int ias; -- 2.25.0.rc1.283.g88dfdc4193-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel