From patchwork Sat Feb 8 00:00:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Derrick X-Patchwork-Id: 1235162 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=intel.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48DskG4h4Nz9sRR for ; Sat, 8 Feb 2020 11:00:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727392AbgBHAAQ (ORCPT ); Fri, 7 Feb 2020 19:00:16 -0500 Received: from mga03.intel.com ([134.134.136.65]:58200 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727032AbgBHAAP (ORCPT ); Fri, 7 Feb 2020 19:00:15 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Feb 2020 16:00:15 -0800 X-IronPort-AV: E=Sophos;i="5.70,415,1574150400"; d="scan'208";a="225545699" Received: from nsgsw-rhel7p6.lm.intel.com ([10.232.116.83]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Feb 2020 16:00:14 -0800 From: Jon Derrick To: Bjorn Helgaas Cc: , , Andy Shevchenko , Mika Westerberg , Pawel Baldysiak , Sinan Kaya , Lorenzo Pieralisi , Keith Busch , Alexandru Gagniuc , Christoph Hellwig , Jon Derrick Subject: [RFC 2/9] PCI: pci-bridge-emul: Eliminate reserved member Date: Fri, 7 Feb 2020 17:00:00 -0700 Message-Id: <1581120007-5280-3-git-send-email-jonathan.derrick@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1581120007-5280-1-git-send-email-jonathan.derrick@intel.com> References: <1581120007-5280-1-git-send-email-jonathan.derrick@intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Assume any bit not in the Read-Only, Read-Write, or Write-1-to-Clear behavior masks is a Reserved bit and should return 0 on reads. Signed-off-by: Jon Derrick --- drivers/pci/pci-bridge-emul.c | 28 +++++++++++----------------- 1 file changed, 11 insertions(+), 17 deletions(-) diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c index d065c2a..e0567ca 100644 --- a/drivers/pci/pci-bridge-emul.c +++ b/drivers/pci/pci-bridge-emul.c @@ -24,6 +24,15 @@ #define PCI_CAP_PCIE_START PCI_BRIDGE_CONF_END #define PCI_CAP_PCIE_END (PCI_CAP_PCIE_START + PCI_EXP_SLTSTA2 + 2) +/** + * struct pci_bridge_reg_behavior - register bits behaviors + * @ro: Read-Only bits + * @rw: Read-Write bits + * @w1c: Write-1-to-Clear bits + * + * Reads and Writes will be filtered by specified behavior. All other bits not + * declared are assumed 'Reserved' and will return 0 on reads. + */ struct pci_bridge_reg_behavior { /* Read-only bits */ u32 ro; @@ -33,9 +42,6 @@ struct pci_bridge_reg_behavior { /* Write-1-to-clear bits */ u32 w1c; - - /* Reserved bits (hardwired to 0) */ - u32 rsvd; }; static const struct pci_bridge_reg_behavior pci_regs_behavior[] = { @@ -49,7 +55,6 @@ struct pci_bridge_reg_behavior { PCI_COMMAND_FAST_BACK) | (PCI_STATUS_CAP_LIST | PCI_STATUS_66MHZ | PCI_STATUS_FAST_BACK | PCI_STATUS_DEVSEL_MASK) << 16), - .rsvd = GENMASK(15, 10) | ((BIT(6) | GENMASK(3, 0)) << 16), .w1c = (PCI_STATUS_PARITY | PCI_STATUS_SIG_TARGET_ABORT | PCI_STATUS_REC_TARGET_ABORT | @@ -106,8 +111,6 @@ struct pci_bridge_reg_behavior { PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY) << 16, - - .rsvd = ((BIT(6) | GENMASK(4, 0)) << 16), }, [PCI_MEMORY_BASE / 4] = { @@ -140,12 +143,10 @@ struct pci_bridge_reg_behavior { [PCI_CAPABILITY_LIST / 4] = { .ro = GENMASK(7, 0), - .rsvd = GENMASK(31, 8), }, [PCI_ROM_ADDRESS1 / 4] = { .rw = GENMASK(31, 11) | BIT(0), - .rsvd = GENMASK(10, 1), }, /* @@ -168,8 +169,6 @@ struct pci_bridge_reg_behavior { .ro = (GENMASK(15, 8) | ((PCI_BRIDGE_CTL_FAST_BACK) << 16)), .w1c = BIT(10) << 16, - - .rsvd = (GENMASK(15, 12) | BIT(4)) << 16, }, }; @@ -196,13 +195,11 @@ struct pci_bridge_reg_behavior { */ .w1c = (BIT(6) | GENMASK(3, 0)) << 16, .ro = GENMASK(5, 4) << 16, - .rsvd = GENMASK(15, 7) << 16, }, [PCI_EXP_LNKCAP / 4] = { /* All bits are RO, except bit 23 which is reserved */ .ro = lower_32_bits(~BIT(23)), - .rsvd = BIT(23), }, [PCI_EXP_LNKCTL / 4] = { @@ -216,7 +213,6 @@ struct pci_bridge_reg_behavior { .rw = GENMASK(15, 14) | GENMASK(11, 3) | GENMASK(1, 0), .ro = GENMASK(13, 0) << 16, .w1c = GENMASK(15, 14) << 16, - .rsvd = GENMASK(13, 12) | BIT(2), }, [PCI_EXP_SLTCAP / 4] = { @@ -234,7 +230,6 @@ struct pci_bridge_reg_behavior { .rw = GENMASK(14, 0), .w1c = (BIT(8) | GENMASK(4, 0)) << 16, .ro = GENMASK(7, 5) << 16, - .rsvd = BIT(15) | (GENMASK(15, 9) << 16), }, [PCI_EXP_RTCTL / 4] = { @@ -246,7 +241,6 @@ struct pci_bridge_reg_behavior { */ .rw = GENMASK(4, 0), .ro = BIT(0) << 16, - .rsvd = GENMASK(15, 5) | (GENMASK(15, 1) << 16), }, [PCI_EXP_RTSTA / 4] = { @@ -256,7 +250,6 @@ struct pci_bridge_reg_behavior { */ .ro = BIT(17) | GENMASK(15, 0), .w1c = BIT(16), - .rsvd = GENMASK(31, 18), }, }; @@ -364,7 +357,8 @@ int pci_bridge_emul_conf_read(struct pci_bridge_emul *bridge, int where, * Make sure we never return any reserved bit with a value * different from 0. */ - *value &= ~behavior[reg / 4].rsvd; + *value &= behavior[reg / 4].ro | behavior[reg / 4].rw | + behavior[reg / 4].w1c; if (size == 1) *value = (*value >> (8 * (where & 3))) & 0xff;