| Message ID | 1470661541-26270-4-git-send-email-tn@semihalf.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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 <oem_id, oem_table_id, rev, domain, bus number range> 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 <tn@semihalf.com> > Signed-off-by: Dongdong Liu <liudongdong3@huawei.com> > Signed-off-by: Christopher Covington <cov@codeaurora.org> > --- > 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 <tn@semihalf.com> > + * > + * 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 <linux/kernel.h> > +#include <linux/ioport.h> > +#include <linux/pci.h> > +#include <linux/pci-acpi.h> > +#include <linux/pci-ecam.h> > + > +#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 <domain:bus> 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);
On 08.08.2016 17:34, Mark Salter wrote: > 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 <oem_id, oem_table_id, rev, domain, bus number range> 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 <tn@semihalf.com> >> Signed-off-by: Dongdong Liu <liudongdong3@huawei.com> >> Signed-off-by: Christopher Covington <cov@codeaurora.org> >> --- >> 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 <tn@semihalf.com> >> + * >> + * 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 <linux/kernel.h> >> +#include <linux/ioport.h> >> +#include <linux/pci.h> >> +#include <linux/pci-acpi.h> >> +#include <linux/pci-ecam.h> >> + >> +#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 $d is wrong. Thanks Mark. I will fix it. Tomasz
On Mon, Aug 08, 2016 at 03:05:39PM +0200, Tomasz Nowicki wrote: > Some platforms may not be fully compliant with generic set of PCI config > accessors. For these cases we implement the way to overwrite accessors > set. Algorithm traverses available quirk list (static array), > matches against <oem_id, oem_table_id, rev, domain, bus number range> and > returns pci_config_window structure with fancy PCI config ops. > oem_id, oem_table_id and rev come from MCFG table standard header. > > It is possible to define custom init call which is responsible for > setting up PCI configuration access accordingly to quirk requirements. > If custom init call is not defined, use standard pci_acpi_setup_ecam_mapping(). > > pci_generic_ecam_ops will be used for platforms free from quirks. > > Signed-off-by: Tomasz Nowicki <tn@semihalf.com> > Signed-off-by: Dongdong Liu <liudongdong3@huawei.com> > Signed-off-by: Christopher Covington <cov@codeaurora.org> > --- > drivers/pci/host/Makefile | 1 + > drivers/pci/host/mcfg-quirks.c | 86 ++++++++++++++++++++++++++++++++++++++++++ > drivers/pci/host/mcfg-quirks.h | 20 ++++++++++ > include/linux/pci-acpi.h | 2 + > 4 files changed, 109 insertions(+) > create mode 100644 drivers/pci/host/mcfg-quirks.c > create mode 100644 drivers/pci/host/mcfg-quirks.h If the object is to work around defects in the ACPI MCFG table, I think I'd put the quirks closer to drivers/acpi/pci_mcfg.c, where we parse that table. What if we actually put them directly *in* drivers/acpi/pci_mcfg.c? > diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile > index 8843410..500cf78 100644 > --- a/drivers/pci/host/Makefile > +++ b/drivers/pci/host/Makefile > @@ -31,3 +31,4 @@ obj-$(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 <tn@semihalf.com> > + * > + * 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 <linux/kernel.h> > +#include <linux/ioport.h> > +#include <linux/pci.h> > +#include <linux/pci-acpi.h> > +#include <linux/pci-ecam.h> > + > +#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 = { > +/* { 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 <domain:bus> 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)) { I think I'd put all the quirk matching tests (domain, bus, OEM ID, table ID, etc) in the same place. > + 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); > -- > 1.9.1 >
On Mon, Aug 08, 2016 at 03:05:39PM +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 <oem_id, oem_table_id, rev, domain, bus number range> 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 <tn@semihalf.com> > Signed-off-by: Dongdong Liu <liudongdong3@huawei.com> > Signed-off-by: Christopher Covington <cov@codeaurora.org> > --- > 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 <tn@semihalf.com> > + * > + * 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 <linux/kernel.h> > +#include <linux/ioport.h> > +#include <linux/pci.h> > +#include <linux/pci-acpi.h> > +#include <linux/pci-ecam.h> > + > +#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 = { > +/* { 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; I remember working out why pci_mcfg_parse() has to cache the data from MCFG, but I don't remember the actual reason... a comment there would have been helpful. Anyway, now I wonder why it's OK to call acpi_get_table(ACPI_SIG_MCFG) again here. I guess I'd be inclined to just cache the OEM info along with the rest of the data so you don't have to get the table again here. > + /* > + * First match against PCI topology <domain:bus> 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); I think the scope of these MCFG quirks is to: 1) Override (or even fabricate) a MEM resource to be used as ECAM space, and 2) Supply a pci_ecam_ops structure if we need something other than pci_generic_ecam_ops Today, pci_mcfg_lookup() merely returns a physical address. I didn't chase down where (or whether) that is turned into a struct resource that we put in the iomem tree. I wonder if pci_mcfg_lookup() could be extended to return a resource and a pci_ecam_ops pointer, and handle the quirk application internally, e.g., int pci_mcfg_lookup(u16 seg, struct resource *bus_res, struct resource *cfgres, struct pci_ecam_ops **ecam_ops) { struct resource res; struct pci_ecam_ops *ops; struct mcfg_entry *e; memset(&res, 0, sizeof(res)); res.flags = IORESOURCE_MEM; e = pci_mcfg_list_search(seg, bus_res); if (e) { res.start = e->addr; res.end = res.start + ...; } ops = &pci_generic_ecam_ops; ret = pci_mcfg_match_quirks(seg, bus_res, &res, &ops); if (ret) return ret; *cfgres = res; *ecam_ops = ops; return 0; } Then the quirks would see any mem resource we discovered via MCFG, and they would see the default pci_ecam_ops, and they could override whatever they needed to. That would make pci_acpi_setup_ecam_mapping() look something like this: pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root) { struct resource cfgres; struct pci_ecam_ops *ecam_ops; ret = pci_mcfg_lookup(root->segment, &root->secondary, &cfgres, &ecam_ops); if (ret) { dev_err(..., "ECAM region not found\n"); return ret; } cfg = pci_ecam_create(&root->device->dev, &cfgres, bus_res, ecam_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); > -- > 1.9.1 >
On 05.09.2016 04:25, Bjorn Helgaas wrote: > On Mon, Aug 08, 2016 at 03:05:39PM +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 <oem_id, oem_table_id, rev, domain, bus number range> 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 <tn@semihalf.com> >> Signed-off-by: Dongdong Liu <liudongdong3@huawei.com> >> Signed-off-by: Christopher Covington <cov@codeaurora.org> >> --- >> 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 > > If the object is to work around defects in the ACPI MCFG table, I > think I'd put the quirks closer to drivers/acpi/pci_mcfg.c, where we > parse that table. What if we actually put them directly *in* > drivers/acpi/pci_mcfg.c? Then we need to export quirk init calls or ecam ops from drivers/pci/host/* directory. Currently we keep mcfg quirk handling code and related drivers in one place drivers/pci/host/ Tomasz
On Tuesday, September 6, 2016 7:49:49 PM CEST Tomasz Nowicki wrote: > On 05.09.2016 04:25, Bjorn Helgaas wrote: > > On Mon, Aug 08, 2016 at 03:05:39PM +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 <oem_id, oem_table_id, rev, domain, bus number range> 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 <tn@semihalf.com> > >> Signed-off-by: Dongdong Liu <liudongdong3@huawei.com> > >> Signed-off-by: Christopher Covington <cov@codeaurora.org> > >> --- > >> 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 > > > > If the object is to work around defects in the ACPI MCFG table, I > > think I'd put the quirks closer to drivers/acpi/pci_mcfg.c, where we > > parse that table. What if we actually put them directly *in* > > drivers/acpi/pci_mcfg.c? > > Then we need to export quirk init calls or ecam ops from > drivers/pci/host/* directory. > > Currently we keep mcfg quirk handling code and related drivers in one > place drivers/pci/host/ I think that's the wrong place to have it, it just leads to people trying to share code with the host drivers in that directory, which hasn't really worked out so far, it just adds complexity. Arnd
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 <tn@semihalf.com> + * + * 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 <linux/kernel.h> +#include <linux/ioport.h> +#include <linux/pci.h> +#include <linux/pci-acpi.h> +#include <linux/pci-ecam.h> + +#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 = { +/* { 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 <domain:bus> 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);