From patchwork Wed Oct 16 17:04:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Derrick X-Patchwork-Id: 11194577 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 92E3417E6 for ; Wed, 16 Oct 2019 23:06:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C3CB218DE for ; Wed, 16 Oct 2019 23:06:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731616AbfJPXGZ (ORCPT ); Wed, 16 Oct 2019 19:06:25 -0400 Received: from mga02.intel.com ([134.134.136.20]:4571 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390020AbfJPXGY (ORCPT ); Wed, 16 Oct 2019 19:06:24 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Oct 2019 16:06:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,305,1566889200"; d="scan'208";a="189833614" Received: from unknown (HELO nsgsw-rhel7p6.lm.intel.com) ([10.232.116.93]) by orsmga008.jf.intel.com with ESMTP; 16 Oct 2019 16:06:23 -0700 From: Jon Derrick To: Lorenzo Pieralisi Cc: Bjorn Helgaas , , Pawel Baldysiak , Artur Paszkiewicz , Keith Busch , Dave Fugate , Andy Shevchenko , Jon Derrick Subject: [PATCH 1/3] PCI: vmd: Add helpers to access device config space Date: Wed, 16 Oct 2019 11:04:46 -0600 Message-Id: <1571245488-3549-2-git-send-email-jonathan.derrick@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1571245488-3549-1-git-send-email-jonathan.derrick@intel.com> References: <1571245488-3549-1-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 This patch adds helpers to access child device config space. It uses the fabric-view of the bus number, which requires the pci accessors to translate out the starting bus number. This will allow internal code to access child device config space without a struct pci_bus while minding the accessing rules. Signed-off-by: Jon Derrick Reviewed-by: Andy Shevchenko --- drivers/pci/controller/vmd.c | 36 ++++++++++++++++++++++++------------ 1 file changed, 24 insertions(+), 12 deletions(-) diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index a35d3f3..959c7c7 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -440,12 +440,10 @@ static void vmd_setup_dma_ops(struct vmd_dev *vmd) } #undef ASSIGN_VMD_DMA_OPS -static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus, +static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, unsigned char busn, unsigned int devfn, int reg, int len) { - char __iomem *addr = vmd->cfgbar + - ((bus->number - vmd->busn_start) << 20) + - (devfn << 12) + reg; + char __iomem *addr = vmd->cfgbar + (busn << 20) + (devfn << 12) + reg; if ((addr - vmd->cfgbar) + len >= resource_size(&vmd->dev->resource[VMD_CFGBAR])) @@ -458,11 +456,10 @@ static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus, * CPU may deadlock if config space is not serialized on some versions of this * hardware, so all config space access is done under a spinlock. */ -static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg, - int len, u32 *value) +static int vmd_cfg_read(struct vmd_dev *vmd, unsigned char busn, + unsigned int devfn, int reg, int len, u32 *value) { - struct vmd_dev *vmd = vmd_from_bus(bus); - char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len); + char __iomem *addr = vmd_cfg_addr(vmd, busn, devfn, reg, len); unsigned long flags; int ret = 0; @@ -488,16 +485,23 @@ static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg, return ret; } +static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg, + int len, u32 *value) +{ + struct vmd_dev *vmd = vmd_from_bus(bus); + return vmd_cfg_read(vmd, bus->number - vmd->busn_start, devfn, + reg, len, value); +} + /* * VMD h/w converts non-posted config writes to posted memory writes. The * read-back in this function forces the completion so it returns only after * the config space was written, as expected. */ -static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg, - int len, u32 value) +static int vmd_cfg_write(struct vmd_dev *vmd, unsigned char busn, + unsigned int devfn, int reg, int len, u32 value) { - struct vmd_dev *vmd = vmd_from_bus(bus); - char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len); + char __iomem *addr = vmd_cfg_addr(vmd, busn, devfn, reg, len); unsigned long flags; int ret = 0; @@ -526,6 +530,14 @@ static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg, return ret; } +static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg, + int len, u32 value) +{ + struct vmd_dev *vmd = vmd_from_bus(bus); + return vmd_cfg_write(vmd, bus->number - vmd->busn_start, devfn, + reg, len, value); +} + static struct pci_ops vmd_ops = { .read = vmd_pci_read, .write = vmd_pci_write,