From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jayachandran C Subject: [PATCH v6 0/5] ACPI based PCI support for arm64 Date: Thu, 14 Jan 2016 13:02:36 +0530 Message-ID: <1452756761-29584-1-git-send-email-jchandra__19602.8556245894$1452755726$gmane$org@broadcom.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1aJc1C-0000h8-P3 for xen-devel@lists.xenproject.org; Thu, 14 Jan 2016 07:08:26 +0000 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: linux-pci@vger.kernel.org, Bjorn Helgaas , linux-acpi@vger.kernel.org, Arnd Bergmann , linux-arm-kernel@lists.infradead.org, "Rafael J. Wysocki" Cc: Tomasz Nowicki , Lorenzo Pieralisi , Jayachandran C , xen-devel@lists.xenproject.org List-Id: xen-devel@lists.xenproject.org This patchset provides a generic ACPI based PCI host controller implementation and uses it on arm64. The first patch moves the common code to handle MCFG ACPI table from arch/x86 to drivers/acpi/pci_mcfg.c. The last patch in the patchset provides the generic implementation of an ACPI based PCI host controller with a new file drivers/acpi/pci_host_acpi.c. The other patches are to fix up arm64 and ACPI code to work with these two patches. The pci host controller implementation keeps a reference to pci_mmcfg_region entry so that config space access is done with a simple mapping and generic PCI config read/write. There is also an implementation of raw_pci_read/raw_pci_write provided by walking the pci_mmcfg_list The patchset is against 4.4, but it can be applied to pci/next with a very minor fixup. This is tested with arm64 QEMU and OVMF and on x86 with qemu. More testing or comments are welcome. The idea is to provide a simpler alternative for ACPI PCI support in arm64, any feedback from PCI or ACPI maintainers would be appreciated on this front. Thanks, JC. v5->v6: - fix arm64 with xen compile issue reported by kbuild bot v4->v5: - Fix arm build issue reported by the kbuild bot - Use config_enabled instead of ifdef in pci_mcfg.c v3->v4: - Handle suggestions from Arnd Bergmann * move the implementation of host controller to drivers/acpi under config option CONFIG_ACPI_PCI_HOST_GENERIC * remove unnecessary arch hooks (this done as much as possible without affecting the scope of the patch, will need another separate patchset for the rest). * remove pcibios_assign_resources fs_initcall that was added - fixup domain_nr assignment code, and move ACPI companion set to PCI code. - Call map resource correctly in setup code - fix kbuild robot report - More testing v2->v3: - Move maintenance of the pci_mmcfg_list to drivers/acpi/pci_mcfg.c without changing x86 logic - use the pci_mmcfg_list in ARM64 implementation - provide raw_pci_read/raw_pci_write v1->v2: - use CONFIG_PCI_MMCONFIG on arm64, provide a weak implementation of pci_mmcfg_late_init for arm64. - The real implementation of pci_mmcfg_late_init is in pci-host-acpi.c and it will save the MCFG table entries to an array. Earlier this was done with an arch_init call - remove unneeded pci_bus_add_devices call and fix MCFG saving code - Added a patch to ACPI pci_root.c to handle arm64 PCI IO resources Jayachandran C (5): APCI: MCFG: Move mmcfg_list management to drivers/acpi PCI: Handle ACPI companion and domain number ACPI: PCI: Support platforms that need pci_remap_iospace arm64: pci: Add ACPI support PCI: ACPI: Add a generic ACPI based host controller arch/arm64/Kconfig | 3 + arch/arm64/kernel/pci.c | 34 ++++- arch/x86/include/asm/pci_x86.h | 24 +--- arch/x86/pci/mmconfig-shared.c | 269 +++++------------------------------ arch/x86/pci/mmconfig_32.c | 1 + arch/x86/pci/mmconfig_64.c | 1 + arch/x86/pci/numachip.c | 1 + drivers/acpi/Kconfig | 8 ++ drivers/acpi/Makefile | 2 + drivers/acpi/pci_host_acpi.c | 186 ++++++++++++++++++++++++ drivers/acpi/pci_mcfg.c | 312 +++++++++++++++++++++++++++++++++++++++++ drivers/acpi/pci_root.c | 62 +++++++- drivers/acpi/resource.c | 2 + drivers/pci/pci.c | 15 +- drivers/pci/probe.c | 2 + drivers/xen/pci.c | 5 +- include/linux/pci-acpi.h | 59 ++++++++ 17 files changed, 717 insertions(+), 269 deletions(-) create mode 100644 drivers/acpi/pci_host_acpi.c create mode 100644 drivers/acpi/pci_mcfg.c -- 1.9.1