From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Message-ID: <1470670477.3551.35.camel@redhat.com> Subject: Re: [RFC PATCH V5 3/5] PCI: Check platform specific ECAM quirks From: Mark Salter To: Tomasz Nowicki , helgaas@kernel.org, arnd@arndb.de, will.deacon@arm.com, catalin.marinas@arm.com, rafael@kernel.org, Lorenzo.Pieralisi@arm.com Cc: hanjun.guo@linaro.org, okaya@codeaurora.org, jchandra@broadcom.com, cov@codeaurora.org, dhdang@apm.com, ard.biesheuvel@linaro.org, robert.richter@caviumnetworks.com, mw@semihalf.com, Liviu.Dudau@arm.com, ddaney@caviumnetworks.com, wangyijing@huawei.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linaro-acpi@lists.linaro.org, jcm@redhat.com, andrea.gallo@linaro.org, jeremy.linton@arm.com, liudongdong3@huawei.com, gabriele.paoloni@huawei.com, jhugo@codeaurora.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 08 Aug 2016 11:34:37 -0400 In-Reply-To: <1470661541-26270-4-git-send-email-tn@semihalf.com> References: <1470661541-26270-1-git-send-email-tn@semihalf.com> <1470661541-26270-4-git-send-email-tn@semihalf.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 List-ID: On Mon, 2016-08-08 at 15:05 +0200, Tomasz Nowicki wrote: > Some platforms may not be fully compliant with generic set of PCI config > accessors. For these cases we implement the way to overwrite accessors > set. Algorithm traverses available quirk list (static array), > matches against and > returns pci_config_window structure with fancy PCI config ops. > oem_id, oem_table_id and rev come from MCFG table standard header. > > It is possible to define custom init call which is responsible for > setting up PCI configuration access accordingly to quirk requirements. > If custom init call is not defined, use standard pci_acpi_setup_ecam_mapping(). > > pci_generic_ecam_ops will be used for platforms free from quirks. > > Signed-off-by: Tomasz Nowicki > Signed-off-by: Dongdong Liu > Signed-off-by: Christopher Covington > --- >  drivers/pci/host/Makefile      |  1 + >  drivers/pci/host/mcfg-quirks.c | 86 ++++++++++++++++++++++++++++++++++++++++++ >  drivers/pci/host/mcfg-quirks.h | 20 ++++++++++ >  include/linux/pci-acpi.h       |  2 + >  4 files changed, 109 insertions(+) >  create mode 100644 drivers/pci/host/mcfg-quirks.c >  create mode 100644 drivers/pci/host/mcfg-quirks.h > > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile > index 8843410..500cf78 100644 > --- a/drivers/pci/host/Makefile > +++ b/drivers/pci/host/Makefile > @@ -31,3 +31,4 @@ obj-$(CONFIG_PCI_HOST_THUNDER_ECAM) += pci-thunder-ecam.o >  obj-$(CONFIG_PCI_HOST_THUNDER_PEM) += pci-thunder-pem.o >  obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o >  obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o > +obj-$(CONFIG_ACPI_MCFG) += mcfg-quirks.o > diff --git a/drivers/pci/host/mcfg-quirks.c b/drivers/pci/host/mcfg-quirks.c > new file mode 100644 > index 0000000..aa9907b > --- /dev/null > +++ b/drivers/pci/host/mcfg-quirks.c > @@ -0,0 +1,86 @@ > +/* > + * Copyright (C) 2016 Semihalf > + * Author: Tomasz Nowicki > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License, version 2, as > + * published by the Free Software Foundation (the "GPL"). > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU > + * General Public License version 2 (GPLv2) for more details. > + * > + * You should have received a copy of the GNU General Public License > + * version 2 (GPLv2) along with this source code. > + */ > + > +#include > +#include > +#include > +#include > +#include > + > +#include "mcfg-quirks.h" > + > +struct pci_cfg_fixup { > + char oem_id[ACPI_OEM_ID_SIZE + 1]; > + char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1]; > + u32 oem_revision; > + struct resource domain_range; > + struct resource bus_range; > + struct pci_ops *ops; > + struct pci_config_window *(*init)(struct acpi_pci_root *root, > +   struct pci_ops *ops); > +}; > + > +#define MCFG_DOM_RANGE(start, end) DEFINE_RES_NAMED((start), \ > + ((end) - (start) + 1), NULL, 0) > +#define MCFG_DOM_ANY MCFG_DOM_RANGE(0x0, 0xffff) > +#define MCFG_BUS_RANGE(start, end) DEFINE_RES_NAMED((start), \ > + ((end) - (start) + 1), \ > + NULL, IORESOURCE_BUS) > +#define MCFG_BUS_ANY MCFG_BUS_RANGE(0x0, 0xff) > + > +static struct pci_cfg_fixup mcfg_quirks[] __initconst = {                                              ^^^^^^^^^^^^^^ I get section warnings because pci_cfg_fixup_match() is not an init function. WARNING: vmlinux.o(.text+0x3f6c74): Section mismatch in reference from the function pci_mcfg_match_quirks() to the variable .init.rodata:$d The function pci_mcfg_match_quirks() references the variable __initconst $d. This is often because pci_mcfg_match_quirks lacks a __initconst  annotation or the annotation of $d is wrong. > +/* { OEM_ID, OEM_TABLE_ID, REV, DOMAIN, BUS_RANGE, pci_ops, init_hook }, */ > +}; > + > +static bool pci_mcfg_fixup_match(struct pci_cfg_fixup *f, > +  struct acpi_table_header *mcfg_header) > +{ > + return (!memcmp(f->oem_id, mcfg_header->oem_id, ACPI_OEM_ID_SIZE) && > + !memcmp(f->oem_table_id, mcfg_header->oem_table_id, > + ACPI_OEM_TABLE_ID_SIZE) && > + f->oem_revision == mcfg_header->oem_revision); > +} > + > +struct pci_config_window *pci_mcfg_match_quirks(struct acpi_pci_root *root) > +{ > + struct resource dom_res = MCFG_DOM_RANGE(root->segment, root->segment); > + struct resource *bus_res = &root->secondary; > + struct pci_cfg_fixup *f = mcfg_quirks; > + struct acpi_table_header *mcfg_header; > + acpi_status status; > + int i; > + > + status = acpi_get_table(ACPI_SIG_MCFG, 0, &mcfg_header); > + if (ACPI_FAILURE(status)) > + return NULL; > + > + /* > +  * First match against PCI topology then use OEM ID, OEM > +  * table ID, and OEM revision from MCFG table standard header. > +  */ > + for (i = 0; i < ARRAY_SIZE(mcfg_quirks); i++, f++) { > + if (resource_contains(&f->domain_range, &dom_res) && > +     resource_contains(&f->bus_range, bus_res) && > +     pci_mcfg_fixup_match(f, mcfg_header)) { > + dev_info(&root->device->dev, "Applying PCI MCFG quirks for %s %s rev: %d\n", > +  f->oem_id, f->oem_table_id, f->oem_revision); > + return f->init ? f->init(root, f->ops) : > + pci_acpi_setup_ecam_mapping(root, f->ops); > + } > + } > + return pci_acpi_setup_ecam_mapping(root, &pci_generic_ecam_ops.pci_ops); > +} > diff --git a/drivers/pci/host/mcfg-quirks.h b/drivers/pci/host/mcfg-quirks.h > new file mode 100644 > index 0000000..45cbd16 > --- /dev/null > +++ b/drivers/pci/host/mcfg-quirks.h > @@ -0,0 +1,20 @@ > +/* > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License, version 2, as > + * published by the Free Software Foundation (the "GPL"). > + * > + * This program is distributed in the hope that it will be useful, but > + * WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU > + * General Public License version 2 (GPLv2) for more details. > + * > + * You should have received a copy of the GNU General Public License > + * version 2 (GPLv2) along with this source code. > + */ > + > +#ifndef __MCFG_QUIRKS_H__ > +#define __MCFG_QUIRKS_H__ > + > +/* MCFG quirks initialize call list */ > + > +#endif /* __MCFG_QUIRKS_H__ */ > diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h > index e9bfe00..28cdce4 100644 > --- a/include/linux/pci-acpi.h > +++ b/include/linux/pci-acpi.h > @@ -25,6 +25,8 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) >  extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle); >   >  extern phys_addr_t pci_mcfg_lookup(u16 domain, struct resource *bus_res); > +extern struct pci_config_window * > +pci_mcfg_match_quirks(struct acpi_pci_root *root); >   >  extern struct pci_config_window * >  pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root, struct pci_ops *ops);