From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Yongji Xie To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-doc@vger.kernel.org Cc: bhelgaas@google.com, alex.williamson@redhat.com, aik@ozlabs.ru, benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, corbet@lwn.net, warrier@linux.vnet.ibm.com, zhong@linux.vnet.ibm.com, nikunj@linux.vnet.ibm.com, gwshan@linux.vnet.ibm.com Subject: [PATCH v3 7/7] PCI: Add a macro to set default alignment for all PCI devices Date: Thu, 30 Jun 2016 18:53:13 +0800 In-Reply-To: <1467283993-3185-1-git-send-email-xyjxie@linux.vnet.ibm.com> References: <1467283993-3185-1-git-send-email-xyjxie@linux.vnet.ibm.com> Message-Id: <1467283993-3185-8-git-send-email-xyjxie@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: Now we can use something like "pci=resource_alignment=*:*:*.*:noresize" to enforce the alignment of all MMIO BARs to be at least PAGE_SIZE so that we can passthrough sub-page(size < PAGE_SIZE) BARs to guest in VFIO module. But sometimes we may want to enable this feature by default on some platforms such as PowerNV platform which would easily see those sub-page BARs because of its 64K page. To achieve that, we add a macro PCIBIOS_DEFAULT_ALIGNMENT to set default alignment for all PCI devices and define it on PowerNV platform. Signed-off-by: Yongji Xie --- arch/powerpc/include/asm/pci.h | 4 ++++ drivers/pci/pci.c | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/arch/powerpc/include/asm/pci.h b/arch/powerpc/include/asm/pci.h index a6f3ac0..b0d76b8 100644 --- a/arch/powerpc/include/asm/pci.h +++ b/arch/powerpc/include/asm/pci.h @@ -28,6 +28,10 @@ #define PCIBIOS_MIN_IO 0x1000 #define PCIBIOS_MIN_MEM 0x10000000 +#ifdef CONFIG_PPC_POWERNV +#define PCIBIOS_DEFAULT_ALIGNMENT PAGE_SIZE +#endif + struct pci_dev; /* Values for the `which' argument to sys_pciconfig_iobase syscall. */ diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 2e15ac8..dde0cce 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4761,6 +4761,10 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev, char *p; bool invalid = false; +#ifdef PCIBIOS_DEFAULT_ALIGNMENT + align = PCIBIOS_DEFAULT_ALIGNMENT; + *resize = false; +#endif spin_lock(&resource_alignment_lock); p = resource_alignment_param; if (pci_has_flag(PCI_PROBE_ONLY)) { -- 1.7.9.5