| Message ID | 1462893601-8937-9-git-send-email-tn@semihalf.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Tue, May 10, 2016 at 5:19 PM, Tomasz Nowicki <tn@semihalf.com> wrote: > This patch is going to implement generic PCI host controller for > ACPI world, similar to what pci-host-generic.c driver does for DT world. > > All such drivers, which we have seen so far, were implemented within > arch/ directory since they had some arch assumptions (x86 and ia64). > However, they all are doing similar thing, so it makes sense to find > some common code and abstract it into the generic driver. > > In order to handle PCI config space regions properly, we define new > MCFG interface which does sanity checks on MCFG table and keeps its > root pointer. User is able to lookup MCFG regions based on that root > pointer and specified domain:bus_start:bus_end touple. We are using > pci_mmcfg_late_init old prototype to avoid another function name. > > The implementation of pci_acpi_scan_root() looks up the MCFG entries > and sets up a new mapping (regions are not mapped until host controller ask > for it). Generic PCI functions are used for accessing config space. > Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h > to create and access ECAM mappings. > > As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice > should be made on a per-architecture basis. > > Signed-off-by: Tomasz Nowicki <tn@semihalf.com> > Signed-off-by: Jayachandran C <jchandra@broadcom.com> > --- > drivers/acpi/Kconfig | 8 +++ > drivers/acpi/Makefile | 1 + > drivers/acpi/pci_mcfg.c | 97 ++++++++++++++++++++++++++ > drivers/acpi/pci_root_generic.c | 149 ++++++++++++++++++++++++++++++++++++++++ Why do we need a new file? Would there be any problem with adding that code to pci_root.c? -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, May 10, 2016 at 5:19 PM, Tomasz Nowicki <tn@semihalf.com> wrote: > This patch is going to implement generic PCI host controller for > ACPI world, similar to what pci-host-generic.c driver does for DT world. > > All such drivers, which we have seen so far, were implemented within > arch/ directory since they had some arch assumptions (x86 and ia64). > However, they all are doing similar thing, so it makes sense to find > some common code and abstract it into the generic driver. Does it mean x86 and ia64 will now be able to use this code too? > In order to handle PCI config space regions properly, we define new > MCFG interface which does sanity checks on MCFG table and keeps its > root pointer. User is able to lookup MCFG regions based on that root > pointer and specified domain:bus_start:bus_end touple. We are using > pci_mmcfg_late_init old prototype to avoid another function name. > > The implementation of pci_acpi_scan_root() looks up the MCFG entries > and sets up a new mapping (regions are not mapped until host controller ask > for it). Generic PCI functions are used for accessing config space. > Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h > to create and access ECAM mappings. > > As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice > should be made on a per-architecture basis. If that code really is generic and there will be more than one architecture using it ever, I think it'll be better for the architectures that don't use it to set something like ARCH_ACPI_PCI_HOST and whoever doesn't set that will use the generic thing. That'd be more logical at least IMO. > Signed-off-by: Tomasz Nowicki <tn@semihalf.com> > Signed-off-by: Jayachandran C <jchandra@broadcom.com> > --- > drivers/acpi/Kconfig | 8 +++ > drivers/acpi/Makefile | 1 + > drivers/acpi/pci_mcfg.c | 97 ++++++++++++++++++++++++++ > drivers/acpi/pci_root_generic.c | 149 ++++++++++++++++++++++++++++++++++++++++ > drivers/pci/ecam.h | 5 ++ > include/linux/pci-acpi.h | 5 ++ > include/linux/pci.h | 5 +- > 7 files changed, 269 insertions(+), 1 deletion(-) > create mode 100644 drivers/acpi/pci_mcfg.c > create mode 100644 drivers/acpi/pci_root_generic.c > > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > index 183ffa3..44afc76 100644 > --- a/drivers/acpi/Kconfig > +++ b/drivers/acpi/Kconfig > @@ -346,6 +346,14 @@ config ACPI_PCI_SLOT > i.e., segment/bus/device/function tuples, with physical slots in > the system. If you are unsure, say N. > > +config ACPI_PCI_HOST_GENERIC > + bool > + select PCI_ECAM > + help > + Select this config option from the architecture Kconfig, > + if it is preferred to enable ACPI PCI host controller driver which > + has no arch-specific assumptions. > + > config X86_PM_TIMER > bool "Power Management Timer Support" if EXPERT > depends on X86 > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index 81e5cbc..627a2b7 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -40,6 +40,7 @@ acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o > acpi-y += ec.o > acpi-$(CONFIG_ACPI_DOCK) += dock.o > acpi-y += pci_root.o pci_link.o pci_irq.o > +obj-$(CONFIG_ACPI_PCI_HOST_GENERIC) += pci_root_generic.o pci_mcfg.o > acpi-y += acpi_lpss.o acpi_apd.o > acpi-y += acpi_platform.o > acpi-y += acpi_pnp.o > diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c > new file mode 100644 > index 0000000..373d079 > --- /dev/null > +++ b/drivers/acpi/pci_mcfg.c > @@ -0,0 +1,97 @@ > +/* > + * Copyright (C) 2016 Broadcom > + * Author: Jayachandran C <jchandra@broadcom.com> > + * 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/pci.h> > +#include <linux/pci-acpi.h> > + > +#define PREFIX "ACPI: " If that is a new file (and I'm totally unconvinced about the need for it), can we simply define a pr_fmt() here as all messages in it seem to be printed by the pr_* functions? -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, May 10, 2016 at 8:49 PM, Tomasz Nowicki <tn@semihalf.com> wrote: > This patch is going to implement generic PCI host controller for > ACPI world, similar to what pci-host-generic.c driver does for DT world. > > All such drivers, which we have seen so far, were implemented within > arch/ directory since they had some arch assumptions (x86 and ia64). > However, they all are doing similar thing, so it makes sense to find > some common code and abstract it into the generic driver. > > In order to handle PCI config space regions properly, we define new > MCFG interface which does sanity checks on MCFG table and keeps its > root pointer. User is able to lookup MCFG regions based on that root > pointer and specified domain:bus_start:bus_end touple. We are using > pci_mmcfg_late_init old prototype to avoid another function name. > > The implementation of pci_acpi_scan_root() looks up the MCFG entries > and sets up a new mapping (regions are not mapped until host controller ask > for it). Generic PCI functions are used for accessing config space. > Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h > to create and access ECAM mappings. > > As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice > should be made on a per-architecture basis. > > Signed-off-by: Tomasz Nowicki <tn@semihalf.com> > Signed-off-by: Jayachandran C <jchandra@broadcom.com> > --- [....] > diff --git a/drivers/pci/ecam.h b/drivers/pci/ecam.h > index 1ad2176..1cccf57 100644 > --- a/drivers/pci/ecam.h > +++ b/drivers/pci/ecam.h > @@ -45,6 +45,11 @@ struct pci_config_window { > void __iomem *win; /* 64-bit single mapping */ > void __iomem **winp; /* 32-bit per bus mapping */ > }; > +#ifdef CONFIG_ACPI_PCI_HOST_GENERIC > + struct acpi_device *companion; /* ACPI companion device */ > +#endif > + int domain; > + > }; Using struct pci_config_window to pass along domain and companion looks bad. I think there are two possible options to do this better: 1. add a 'struct fwnode_handle *' or 'struct device *parent_dev' instead of the companion and domain fields above. In case of ACPI either of them can be used to get the acpi_device and both domain and companion can be set from that. 2. make pci_config_window fully embeddable by moving allocation out of pci_ecam_create to its callers. Then it can be embedded into acpi_pci_generic_root_info, and container_of can be used to get acpi info from ->sysdata. The first option should be easier to implement but the second may be better on long run. I would leave it to the Bjorn or Rafael to suggest which is preferred. JC. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, May 13, 2016 at 1:25 PM, Jayachandran C <jchandra@broadcom.com> wrote: > On Tue, May 10, 2016 at 8:49 PM, Tomasz Nowicki <tn@semihalf.com> wrote: >> This patch is going to implement generic PCI host controller for >> ACPI world, similar to what pci-host-generic.c driver does for DT world. >> >> All such drivers, which we have seen so far, were implemented within >> arch/ directory since they had some arch assumptions (x86 and ia64). >> However, they all are doing similar thing, so it makes sense to find >> some common code and abstract it into the generic driver. >> >> In order to handle PCI config space regions properly, we define new >> MCFG interface which does sanity checks on MCFG table and keeps its >> root pointer. User is able to lookup MCFG regions based on that root >> pointer and specified domain:bus_start:bus_end touple. We are using >> pci_mmcfg_late_init old prototype to avoid another function name. >> >> The implementation of pci_acpi_scan_root() looks up the MCFG entries >> and sets up a new mapping (regions are not mapped until host controller ask >> for it). Generic PCI functions are used for accessing config space. >> Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h >> to create and access ECAM mappings. >> >> As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice >> should be made on a per-architecture basis. >> >> Signed-off-by: Tomasz Nowicki <tn@semihalf.com> >> Signed-off-by: Jayachandran C <jchandra@broadcom.com> >> --- > [....] > >> diff --git a/drivers/pci/ecam.h b/drivers/pci/ecam.h >> index 1ad2176..1cccf57 100644 >> --- a/drivers/pci/ecam.h >> +++ b/drivers/pci/ecam.h >> @@ -45,6 +45,11 @@ struct pci_config_window { >> void __iomem *win; /* 64-bit single mapping */ >> void __iomem **winp; /* 32-bit per bus mapping */ >> }; >> +#ifdef CONFIG_ACPI_PCI_HOST_GENERIC >> + struct acpi_device *companion; /* ACPI companion device */ >> +#endif >> + int domain; >> + >> }; > > Using struct pci_config_window to pass along domain and > companion looks bad. I think there are two possible options > to do this better: > > 1. add a 'struct fwnode_handle *' or 'struct device *parent_dev' > instead of the companion and domain fields above. In case of > ACPI either of them can be used to get the acpi_device and > both domain and companion can be set from that. > > 2. make pci_config_window fully embeddable by moving allocation > out of pci_ecam_create to its callers. Then it can be embedded > into acpi_pci_generic_root_info, and container_of can be used > to get acpi info from ->sysdata. > > The first option should be easier to implement but the second may > be better on long run. I would leave it to the Bjorn or Rafael to > suggest which is preferred. Personally, I'd probably try to use fwnode_handle, but the second option makes sense too in principle. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 13.05.2016 13:31, Rafael J. Wysocki wrote: > On Fri, May 13, 2016 at 1:25 PM, Jayachandran C <jchandra@broadcom.com> wrote: >> On Tue, May 10, 2016 at 8:49 PM, Tomasz Nowicki <tn@semihalf.com> wrote: >>> This patch is going to implement generic PCI host controller for >>> ACPI world, similar to what pci-host-generic.c driver does for DT world. >>> >>> All such drivers, which we have seen so far, were implemented within >>> arch/ directory since they had some arch assumptions (x86 and ia64). >>> However, they all are doing similar thing, so it makes sense to find >>> some common code and abstract it into the generic driver. >>> >>> In order to handle PCI config space regions properly, we define new >>> MCFG interface which does sanity checks on MCFG table and keeps its >>> root pointer. User is able to lookup MCFG regions based on that root >>> pointer and specified domain:bus_start:bus_end touple. We are using >>> pci_mmcfg_late_init old prototype to avoid another function name. >>> >>> The implementation of pci_acpi_scan_root() looks up the MCFG entries >>> and sets up a new mapping (regions are not mapped until host controller ask >>> for it). Generic PCI functions are used for accessing config space. >>> Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h >>> to create and access ECAM mappings. >>> >>> As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice >>> should be made on a per-architecture basis. >>> >>> Signed-off-by: Tomasz Nowicki <tn@semihalf.com> >>> Signed-off-by: Jayachandran C <jchandra@broadcom.com> >>> --- >> [....] >> >>> diff --git a/drivers/pci/ecam.h b/drivers/pci/ecam.h >>> index 1ad2176..1cccf57 100644 >>> --- a/drivers/pci/ecam.h >>> +++ b/drivers/pci/ecam.h >>> @@ -45,6 +45,11 @@ struct pci_config_window { >>> void __iomem *win; /* 64-bit single mapping */ >>> void __iomem **winp; /* 32-bit per bus mapping */ >>> }; >>> +#ifdef CONFIG_ACPI_PCI_HOST_GENERIC >>> + struct acpi_device *companion; /* ACPI companion device */ >>> +#endif >>> + int domain; >>> + >>> }; >> >> Using struct pci_config_window to pass along domain and >> companion looks bad. I think there are two possible options >> to do this better: >> >> 1. add a 'struct fwnode_handle *' or 'struct device *parent_dev' >> instead of the companion and domain fields above. In case of >> ACPI either of them can be used to get the acpi_device and >> both domain and companion can be set from that. >> >> 2. make pci_config_window fully embeddable by moving allocation >> out of pci_ecam_create to its callers. Then it can be embedded >> into acpi_pci_generic_root_info, and container_of can be used >> to get acpi info from ->sysdata. >> >> The first option should be easier to implement but the second may >> be better on long run. I would leave it to the Bjorn or Rafael to >> suggest which is preferred. > > Personally, I'd probably try to use fwnode_handle, but the second > option makes sense too in principle. > Thanks for suggestions. I will try to use fwnode_handle Tomasz -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, May 10, 2016 at 8:49 PM, Tomasz Nowicki <tn@semihalf.com> wrote: > This patch is going to implement generic PCI host controller for > ACPI world, similar to what pci-host-generic.c driver does for DT world. > > All such drivers, which we have seen so far, were implemented within > arch/ directory since they had some arch assumptions (x86 and ia64). > However, they all are doing similar thing, so it makes sense to find > some common code and abstract it into the generic driver. > > In order to handle PCI config space regions properly, we define new > MCFG interface which does sanity checks on MCFG table and keeps its > root pointer. User is able to lookup MCFG regions based on that root > pointer and specified domain:bus_start:bus_end touple. We are using > pci_mmcfg_late_init old prototype to avoid another function name. > > The implementation of pci_acpi_scan_root() looks up the MCFG entries > and sets up a new mapping (regions are not mapped until host controller ask > for it). Generic PCI functions are used for accessing config space. > Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h > to create and access ECAM mappings. > > As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice > should be made on a per-architecture basis. Looking thru the new code, I see a few issues, please see below > Signed-off-by: Tomasz Nowicki <tn@semihalf.com> > Signed-off-by: Jayachandran C <jchandra@broadcom.com> > --- > drivers/acpi/Kconfig | 8 +++ > drivers/acpi/Makefile | 1 + > drivers/acpi/pci_mcfg.c | 97 ++++++++++++++++++++++++++ > drivers/acpi/pci_root_generic.c | 149 ++++++++++++++++++++++++++++++++++++++++ > drivers/pci/ecam.h | 5 ++ > include/linux/pci-acpi.h | 5 ++ > include/linux/pci.h | 5 +- > 7 files changed, 269 insertions(+), 1 deletion(-) > create mode 100644 drivers/acpi/pci_mcfg.c > create mode 100644 drivers/acpi/pci_root_generic.c > > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > index 183ffa3..44afc76 100644 > --- a/drivers/acpi/Kconfig > +++ b/drivers/acpi/Kconfig > @@ -346,6 +346,14 @@ config ACPI_PCI_SLOT > i.e., segment/bus/device/function tuples, with physical slots in > the system. If you are unsure, say N. > > +config ACPI_PCI_HOST_GENERIC > + bool > + select PCI_ECAM > + help > + Select this config option from the architecture Kconfig, > + if it is preferred to enable ACPI PCI host controller driver which > + has no arch-specific assumptions. > + > config X86_PM_TIMER > bool "Power Management Timer Support" if EXPERT > depends on X86 > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index 81e5cbc..627a2b7 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -40,6 +40,7 @@ acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o > acpi-y += ec.o > acpi-$(CONFIG_ACPI_DOCK) += dock.o > acpi-y += pci_root.o pci_link.o pci_irq.o > +obj-$(CONFIG_ACPI_PCI_HOST_GENERIC) += pci_root_generic.o pci_mcfg.o > acpi-y += acpi_lpss.o acpi_apd.o > acpi-y += acpi_platform.o > acpi-y += acpi_pnp.o > diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c > new file mode 100644 > index 0000000..373d079 > --- /dev/null > +++ b/drivers/acpi/pci_mcfg.c > @@ -0,0 +1,97 @@ > +/* > + * Copyright (C) 2016 Broadcom > + * Author: Jayachandran C <jchandra@broadcom.com> > + * 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/pci.h> > +#include <linux/pci-acpi.h> > + > +#define PREFIX "ACPI: " > + > +/* Root pointer to the mapped MCFG table */ > +static struct acpi_table_mcfg *mcfg_table; > + > +#define MCFG_ENTRIES(mcfg_ptr) (((mcfg_ptr)->header.length - \ > + sizeof(struct acpi_table_mcfg)) / \ > + sizeof(struct acpi_mcfg_allocation)) It would be better if you used static inline function here. > +static phys_addr_t pci_mcfg_lookup_static(u16 seg, u8 bus_start, u8 bus_end) > +{ > + struct acpi_mcfg_allocation *mptr; > + int i; > + > + if (!mcfg_table) { > + pr_err(PREFIX "MCFG table not available, lookup failed\n"); > + return -ENXIO; > + } > + > + mptr = (struct acpi_mcfg_allocation *) &mcfg_table[1]; > + > + /* > + * We expect exact match, unless MCFG entry end bus covers more than > + * specified by caller. > + */ > + for (i = 0; i < MCFG_ENTRIES(mcfg_table); i++, mptr++) { > + if (mptr->pci_segment == seg && > + mptr->start_bus_number == bus_start && > + mptr->end_bus_number >= bus_end) { > + return mptr->address; > + } > + } There is an issue here, the bus range is obtained if different ways. If the _CRS has it, this should be fine. But if it is _BBN-0xff or the default 0-0xff, then I would think taking the MCFG entry end would be better. This would require updating the bus resource end. Also (trivial), the braces are not needed. > + return -ENXIO; > +} > + > +phys_addr_t pci_mcfg_lookup(struct acpi_device *device, u16 seg, > + struct resource *bus_res) > +{ > + phys_addr_t addr; > + > + addr = acpi_pci_root_get_mcfg_addr(device->handle); > + if (addr) > + return addr; When you have address from _CBA, you are assuming that the bus range is also set correctly (from _CRS or as _BBN-0xff). Is this assumption correct? (this was discussed earlier) you are doing the _CBA call again, I think cleaning up the _CBA, _BBN, _CRS and MCFG based ECAM area resources and defaults should be a different patch, which would need changes to pci_root.c. We should use root->mcfg_addr in this patchset. > + > + return pci_mcfg_lookup_static(seg, bus_res->start, bus_res->end); There is no need to have a separate function for this, based on by above comment, you might need to change bus_res, so having it here would be better. > +} > + > +static __init int pci_mcfg_parse(struct acpi_table_header *header) > +{ > + struct acpi_table_mcfg *mcfg; > + int n; > + > + if (!header) > + return -EINVAL; This is not needed, the handler is not called if header is NULL > + > + mcfg = (struct acpi_table_mcfg *)header; > + n = MCFG_ENTRIES(mcfg); > + if (n <= 0 || n > 255) { > + pr_err(PREFIX "MCFG has incorrect entries (%d).\n", n); > + return -EINVAL; > + } > > + mcfg_table = mcfg; Saving a reference of ACPI mapping seems dangerous, acpi_parse_table calles early_acpi_os_unmap_memory() after calling handler, which does not do anything since acpi_gbl_permanent_mmap is set. I would suggest copying the entries. > + pr_info(PREFIX "MCFG table loaded, %d entries detected\n", n); > + return 0; > +} > + > +/* Interface called by ACPI - parse and save MCFG table */ > +void __init pci_mmcfg_late_init(void) > +{ > + int err = acpi_table_parse(ACPI_SIG_MCFG, pci_mcfg_parse); > + if (err) > + pr_err(PREFIX "Failed to parse MCFG (%d)\n", err); > +} JC. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 10/05/16 17:19, Tomasz Nowicki wrote: > This patch is going to implement generic PCI host controller for > ACPI world, similar to what pci-host-generic.c driver does for DT world. > > All such drivers, which we have seen so far, were implemented within > arch/ directory since they had some arch assumptions (x86 and ia64). > However, they all are doing similar thing, so it makes sense to find > some common code and abstract it into the generic driver. > > In order to handle PCI config space regions properly, we define new > MCFG interface which does sanity checks on MCFG table and keeps its > root pointer. User is able to lookup MCFG regions based on that root > pointer and specified domain:bus_start:bus_end touple. We are using > pci_mmcfg_late_init old prototype to avoid another function name. > > The implementation of pci_acpi_scan_root() looks up the MCFG entries > and sets up a new mapping (regions are not mapped until host controller ask > for it). Generic PCI functions are used for accessing config space. > Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h > to create and access ECAM mappings. > > As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice > should be made on a per-architecture basis. > > Signed-off-by: Tomasz Nowicki <tn@semihalf.com> > Signed-off-by: Jayachandran C <jchandra@broadcom.com> > --- > drivers/acpi/Kconfig | 8 +++ > drivers/acpi/Makefile | 1 + > drivers/acpi/pci_mcfg.c | 97 ++++++++++++++++++++++++++ > drivers/acpi/pci_root_generic.c | 149 ++++++++++++++++++++++++++++++++++++++++ > drivers/pci/ecam.h | 5 ++ > include/linux/pci-acpi.h | 5 ++ > include/linux/pci.h | 5 +- > 7 files changed, 269 insertions(+), 1 deletion(-) > create mode 100644 drivers/acpi/pci_mcfg.c > create mode 100644 drivers/acpi/pci_root_generic.c > > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > index 183ffa3..44afc76 100644 > --- a/drivers/acpi/Kconfig > +++ b/drivers/acpi/Kconfig > @@ -346,6 +346,14 @@ config ACPI_PCI_SLOT > i.e., segment/bus/device/function tuples, with physical slots in > the system. If you are unsure, say N. > > +config ACPI_PCI_HOST_GENERIC > + bool > + select PCI_ECAM > + help > + Select this config option from the architecture Kconfig, > + if it is preferred to enable ACPI PCI host controller driver which > + has no arch-specific assumptions. > + > config X86_PM_TIMER > bool "Power Management Timer Support" if EXPERT > depends on X86 > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index 81e5cbc..627a2b7 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -40,6 +40,7 @@ acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o > acpi-y += ec.o > acpi-$(CONFIG_ACPI_DOCK) += dock.o > acpi-y += pci_root.o pci_link.o pci_irq.o > +obj-$(CONFIG_ACPI_PCI_HOST_GENERIC) += pci_root_generic.o pci_mcfg.o > acpi-y += acpi_lpss.o acpi_apd.o > acpi-y += acpi_platform.o > acpi-y += acpi_pnp.o > diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c > new file mode 100644 > index 0000000..373d079 > --- /dev/null > +++ b/drivers/acpi/pci_mcfg.c > @@ -0,0 +1,97 @@ > +/* > + * Copyright (C) 2016 Broadcom > + * Author: Jayachandran C <jchandra@broadcom.com> > + * 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/pci.h> > +#include <linux/pci-acpi.h> > + > +#define PREFIX "ACPI: " > + > +/* Root pointer to the mapped MCFG table */ > +static struct acpi_table_mcfg *mcfg_table; > + > +#define MCFG_ENTRIES(mcfg_ptr) (((mcfg_ptr)->header.length - \ > + sizeof(struct acpi_table_mcfg)) / \ > + sizeof(struct acpi_mcfg_allocation)) > + > +static phys_addr_t pci_mcfg_lookup_static(u16 seg, u8 bus_start, u8 bus_end) > +{ > + struct acpi_mcfg_allocation *mptr; > + int i; > + > + if (!mcfg_table) { > + pr_err(PREFIX "MCFG table not available, lookup failed\n"); > + return -ENXIO; > + } > + > + mptr = (struct acpi_mcfg_allocation *) &mcfg_table[1]; > + > + /* > + * We expect exact match, unless MCFG entry end bus covers more than > + * specified by caller. > + */ > + for (i = 0; i < MCFG_ENTRIES(mcfg_table); i++, mptr++) { > + if (mptr->pci_segment == seg && > + mptr->start_bus_number == bus_start && > + mptr->end_bus_number >= bus_end) { > + return mptr->address; > + } > + } > + > + return -ENXIO; > +} > + > +phys_addr_t pci_mcfg_lookup(struct acpi_device *device, u16 seg, > + struct resource *bus_res) > +{ > + phys_addr_t addr; > + > + addr = acpi_pci_root_get_mcfg_addr(device->handle); > + if (addr) > + return addr; > + > + return pci_mcfg_lookup_static(seg, bus_res->start, bus_res->end); > +} > + > +static __init int pci_mcfg_parse(struct acpi_table_header *header) > +{ > + struct acpi_table_mcfg *mcfg; > + int n; > + > + if (!header) > + return -EINVAL; Maybe that's bike shedding, but acpi_table_parse already checks that the table passed to the handler exists, so this is redundant. Regards, Matthias -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 14.05.2016 11:07, Jayachandran C wrote: > On Tue, May 10, 2016 at 8:49 PM, Tomasz Nowicki <tn@semihalf.com> wrote: >> This patch is going to implement generic PCI host controller for >> ACPI world, similar to what pci-host-generic.c driver does for DT world. >> >> All such drivers, which we have seen so far, were implemented within >> arch/ directory since they had some arch assumptions (x86 and ia64). >> However, they all are doing similar thing, so it makes sense to find >> some common code and abstract it into the generic driver. >> >> In order to handle PCI config space regions properly, we define new >> MCFG interface which does sanity checks on MCFG table and keeps its >> root pointer. User is able to lookup MCFG regions based on that root >> pointer and specified domain:bus_start:bus_end touple. We are using >> pci_mmcfg_late_init old prototype to avoid another function name. >> >> The implementation of pci_acpi_scan_root() looks up the MCFG entries >> and sets up a new mapping (regions are not mapped until host controller ask >> for it). Generic PCI functions are used for accessing config space. >> Driver selects PCI_ECAM and uses functions from drivers/pci/ecam.h >> to create and access ECAM mappings. >> >> As mentioned in Kconfig help section, ACPI_PCI_HOST_GENERIC choice >> should be made on a per-architecture basis. > > Looking thru the new code, I see a few issues, please see below > >> Signed-off-by: Tomasz Nowicki <tn@semihalf.com> >> Signed-off-by: Jayachandran C <jchandra@broadcom.com> >> --- >> drivers/acpi/Kconfig | 8 +++ >> drivers/acpi/Makefile | 1 + >> drivers/acpi/pci_mcfg.c | 97 ++++++++++++++++++++++++++ >> drivers/acpi/pci_root_generic.c | 149 ++++++++++++++++++++++++++++++++++++++++ >> drivers/pci/ecam.h | 5 ++ >> include/linux/pci-acpi.h | 5 ++ >> include/linux/pci.h | 5 +- >> 7 files changed, 269 insertions(+), 1 deletion(-) >> create mode 100644 drivers/acpi/pci_mcfg.c >> create mode 100644 drivers/acpi/pci_root_generic.c >> >> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig >> index 183ffa3..44afc76 100644 >> --- a/drivers/acpi/Kconfig >> +++ b/drivers/acpi/Kconfig >> @@ -346,6 +346,14 @@ config ACPI_PCI_SLOT >> i.e., segment/bus/device/function tuples, with physical slots in >> the system. If you are unsure, say N. >> >> +config ACPI_PCI_HOST_GENERIC >> + bool >> + select PCI_ECAM >> + help >> + Select this config option from the architecture Kconfig, >> + if it is preferred to enable ACPI PCI host controller driver which >> + has no arch-specific assumptions. >> + >> config X86_PM_TIMER >> bool "Power Management Timer Support" if EXPERT >> depends on X86 >> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile >> index 81e5cbc..627a2b7 100644 >> --- a/drivers/acpi/Makefile >> +++ b/drivers/acpi/Makefile >> @@ -40,6 +40,7 @@ acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o >> acpi-y += ec.o >> acpi-$(CONFIG_ACPI_DOCK) += dock.o >> acpi-y += pci_root.o pci_link.o pci_irq.o >> +obj-$(CONFIG_ACPI_PCI_HOST_GENERIC) += pci_root_generic.o pci_mcfg.o >> acpi-y += acpi_lpss.o acpi_apd.o >> acpi-y += acpi_platform.o >> acpi-y += acpi_pnp.o >> diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c >> new file mode 100644 >> index 0000000..373d079 >> --- /dev/null >> +++ b/drivers/acpi/pci_mcfg.c >> @@ -0,0 +1,97 @@ >> +/* >> + * Copyright (C) 2016 Broadcom >> + * Author: Jayachandran C <jchandra@broadcom.com> >> + * 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/pci.h> >> +#include <linux/pci-acpi.h> >> + >> +#define PREFIX "ACPI: " >> + >> +/* Root pointer to the mapped MCFG table */ >> +static struct acpi_table_mcfg *mcfg_table; >> + >> +#define MCFG_ENTRIES(mcfg_ptr) (((mcfg_ptr)->header.length - \ >> + sizeof(struct acpi_table_mcfg)) / \ >> + sizeof(struct acpi_mcfg_allocation)) > > It would be better if you used static inline function here. OK > >> +static phys_addr_t pci_mcfg_lookup_static(u16 seg, u8 bus_start, u8 bus_end) >> +{ >> + struct acpi_mcfg_allocation *mptr; >> + int i; >> + >> + if (!mcfg_table) { >> + pr_err(PREFIX "MCFG table not available, lookup failed\n"); >> + return -ENXIO; >> + } >> + >> + mptr = (struct acpi_mcfg_allocation *) &mcfg_table[1]; >> + >> + /* >> + * We expect exact match, unless MCFG entry end bus covers more than >> + * specified by caller. >> + */ >> + for (i = 0; i < MCFG_ENTRIES(mcfg_table); i++, mptr++) { >> + if (mptr->pci_segment == seg && >> + mptr->start_bus_number == bus_start && >> + mptr->end_bus_number >= bus_end) { >> + return mptr->address; >> + } >> + } > > There is an issue here, the bus range is obtained if different > ways. If the _CRS has it, this should be fine. But if it is _BBN-0xff > or the default 0-0xff, then I would think taking the MCFG entry end > would be better. This would require updating the bus resource end. Yeah we can implement algorithm like that but IMO it would try to guess what FW designer meant putting various combination of BUS resources into the tables. We should rather be strict about this so I agree with Bjorn: https://lkml.org/lkml/2016/4/28/807 Either we get exact match or MCFG covers more than the host bridge range. Host bridge bus range definition -> MCFG _BBN-0xff -> we expect exact _BBN-0xff match 0-0xff -> ditto _CRS (the only way to trim host bridge bus rage) -> exact match or MCFG covers more > > Also (trivial), the braces are not needed. OK > >> + return -ENXIO; >> +} >> + >> +phys_addr_t pci_mcfg_lookup(struct acpi_device *device, u16 seg, >> + struct resource *bus_res) >> +{ >> + phys_addr_t addr; >> + >> + addr = acpi_pci_root_get_mcfg_addr(device->handle); >> + if (addr) >> + return addr; > > When you have address from _CBA, you are assuming that the > bus range is also set correctly (from _CRS or as _BBN-0xff). Is > this assumption correct? I think so, see above. Maybe Bjorn may advise here. > > (this was discussed earlier) you are doing the _CBA call again, > I think cleaning up the _CBA, _BBN, _CRS and MCFG based > ECAM area resources and defaults should be a different patch, > which would need changes to pci_root.c. We should use > root->mcfg_addr in this patchset. OK > >> + >> + return pci_mcfg_lookup_static(seg, bus_res->start, bus_res->end); > > There is no need to have a separate function for this, based on by > above comment, you might need to change bus_res, so having it here > would be better. > >> +} >> + >> +static __init int pci_mcfg_parse(struct acpi_table_header *header) >> +{ >> + struct acpi_table_mcfg *mcfg; >> + int n; >> + >> + if (!header) >> + return -EINVAL; > > This is not needed, the handler is not called if header is NULL OK > >> + >> + mcfg = (struct acpi_table_mcfg *)header; >> + n = MCFG_ENTRIES(mcfg); >> + if (n <= 0 || n > 255) { >> + pr_err(PREFIX "MCFG has incorrect entries (%d).\n", n); >> + return -EINVAL; >> + } >> >> + mcfg_table = mcfg; > > Saving a reference of ACPI mapping seems dangerous, acpi_parse_table > calles early_acpi_os_unmap_memory() after calling handler, which does > not do anything since acpi_gbl_permanent_mmap is set. > > I would suggest copying the entries. You got the point about early_acpi_os_unmap_memory but that would be the case if we call pci_mmcfg_late_init before acpi_early_init. But pci_mmcfg_late_init is called much later. Also the code is much simpler as is now. Thanks, Tomasz -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 183ffa3..44afc76 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -346,6 +346,14 @@ config ACPI_PCI_SLOT i.e., segment/bus/device/function tuples, with physical slots in the system. If you are unsure, say N. +config ACPI_PCI_HOST_GENERIC + bool + select PCI_ECAM + help + Select this config option from the architecture Kconfig, + if it is preferred to enable ACPI PCI host controller driver which + has no arch-specific assumptions. + config X86_PM_TIMER bool "Power Management Timer Support" if EXPERT depends on X86 diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 81e5cbc..627a2b7 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -40,6 +40,7 @@ acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o acpi-y += ec.o acpi-$(CONFIG_ACPI_DOCK) += dock.o acpi-y += pci_root.o pci_link.o pci_irq.o +obj-$(CONFIG_ACPI_PCI_HOST_GENERIC) += pci_root_generic.o pci_mcfg.o acpi-y += acpi_lpss.o acpi_apd.o acpi-y += acpi_platform.o acpi-y += acpi_pnp.o diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c new file mode 100644 index 0000000..373d079 --- /dev/null +++ b/drivers/acpi/pci_mcfg.c @@ -0,0 +1,97 @@ +/* + * Copyright (C) 2016 Broadcom + * Author: Jayachandran C <jchandra@broadcom.com> + * 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/pci.h> +#include <linux/pci-acpi.h> + +#define PREFIX "ACPI: " + +/* Root pointer to the mapped MCFG table */ +static struct acpi_table_mcfg *mcfg_table; + +#define MCFG_ENTRIES(mcfg_ptr) (((mcfg_ptr)->header.length - \ + sizeof(struct acpi_table_mcfg)) / \ + sizeof(struct acpi_mcfg_allocation)) + +static phys_addr_t pci_mcfg_lookup_static(u16 seg, u8 bus_start, u8 bus_end) +{ + struct acpi_mcfg_allocation *mptr; + int i; + + if (!mcfg_table) { + pr_err(PREFIX "MCFG table not available, lookup failed\n"); + return -ENXIO; + } + + mptr = (struct acpi_mcfg_allocation *) &mcfg_table[1]; + + /* + * We expect exact match, unless MCFG entry end bus covers more than + * specified by caller. + */ + for (i = 0; i < MCFG_ENTRIES(mcfg_table); i++, mptr++) { + if (mptr->pci_segment == seg && + mptr->start_bus_number == bus_start && + mptr->end_bus_number >= bus_end) { + return mptr->address; + } + } + + return -ENXIO; +} + +phys_addr_t pci_mcfg_lookup(struct acpi_device *device, u16 seg, + struct resource *bus_res) +{ + phys_addr_t addr; + + addr = acpi_pci_root_get_mcfg_addr(device->handle); + if (addr) + return addr; + + return pci_mcfg_lookup_static(seg, bus_res->start, bus_res->end); +} + +static __init int pci_mcfg_parse(struct acpi_table_header *header) +{ + struct acpi_table_mcfg *mcfg; + int n; + + if (!header) + return -EINVAL; + + mcfg = (struct acpi_table_mcfg *)header; + n = MCFG_ENTRIES(mcfg); + if (n <= 0 || n > 255) { + pr_err(PREFIX "MCFG has incorrect entries (%d).\n", n); + return -EINVAL; + } + + mcfg_table = mcfg; + pr_info(PREFIX "MCFG table loaded, %d entries detected\n", n); + return 0; +} + +/* Interface called by ACPI - parse and save MCFG table */ +void __init pci_mmcfg_late_init(void) +{ + int err = acpi_table_parse(ACPI_SIG_MCFG, pci_mcfg_parse); + if (err) + pr_err(PREFIX "Failed to parse MCFG (%d)\n", err); +} diff --git a/drivers/acpi/pci_root_generic.c b/drivers/acpi/pci_root_generic.c new file mode 100644 index 0000000..6f4940a --- /dev/null +++ b/drivers/acpi/pci_root_generic.c @@ -0,0 +1,149 @@ +/* + * Copyright (C) 2016 Broadcom + * Author: Jayachandran C <jchandra@broadcom.com> + * 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/pci.h> +#include <linux/pci-acpi.h> +#include <linux/slab.h> + +#include "../pci/ecam.h" + +#define PREFIX "ACPI PCI: " + +/* ACPI info for generic ACPI PCI controller */ +struct acpi_pci_generic_root_info { + struct acpi_pci_root_info common; + struct pci_config_window *cfg; /* config space mapping */ +}; + +void acpi_pci_set_companion(struct pci_host_bridge *bridge) +{ + struct pci_config_window *cfg = bridge->bus->sysdata; + + ACPI_COMPANION_SET(&bridge->dev, cfg->companion); +} + +int acpi_pci_bus_domain_nr(struct pci_bus *bus) +{ + struct pci_config_window *cfg = bus->sysdata; + + return cfg->domain; +} + +/* + * Lookup the bus range for the domain in MCFG, and set up config space + * mapping. + */ +static int pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root, + struct acpi_pci_generic_root_info *ri) +{ + struct resource *bus_res = &root->secondary; + u16 seg = root->segment; + struct pci_config_window *cfg; + struct resource cfgres; + unsigned int bsz; + phys_addr_t addr; + + addr = pci_mcfg_lookup(root->device, seg, bus_res); + if (IS_ERR_VALUE(addr)) { + pr_err(PREFIX"%04x:%pR MCFG region not found\n", seg, bus_res); + return addr; + } + + bsz = 1 << pci_generic_ecam_ops.bus_shift; + cfgres.start = addr + bus_res->start * bsz; + cfgres.end = addr + (bus_res->end + 1) * bsz - 1; + cfgres.flags = IORESOURCE_MEM; + cfg = pci_ecam_create(&root->device->dev, &cfgres, bus_res, + &pci_generic_ecam_ops); + if (IS_ERR(cfg)) { + pr_err("%04x:%pR error %ld mapping CAM\n", seg, bus_res, + PTR_ERR(cfg)); + return PTR_ERR(cfg); + } + + cfg->domain = seg; + cfg->companion = root->device; + ri->cfg = cfg; + return 0; +} + +/* release_info: free resrouces allocated by init_info */ +static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci) +{ + struct acpi_pci_generic_root_info *ri; + + ri = container_of(ci, struct acpi_pci_generic_root_info, common); + pci_ecam_free(ri->cfg); + kfree(ri); +} + +static struct acpi_pci_root_ops acpi_pci_root_ops = { + .release_info = pci_acpi_generic_release_info, +}; + +/* Interface called from ACPI code to setup PCI host controller */ +struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) +{ + int node = acpi_get_node(root->device->handle); + struct acpi_pci_generic_root_info *ri; + struct pci_bus *bus, *child; + int err; + + ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node); + if (!ri) + return NULL; + + err = pci_acpi_setup_ecam_mapping(root, ri); + if (err) + return NULL; + + acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops; + bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common, + ri->cfg); + if (!bus) + return NULL; + + pci_bus_size_bridges(bus); + pci_bus_assign_resources(bus); + + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + + return bus; +} + +int raw_pci_read(unsigned int domain, unsigned int busn, unsigned int devfn, + int reg, int len, u32 *val) +{ + struct pci_bus *bus = pci_find_bus(domain, busn); + + if (!bus) + return PCIBIOS_DEVICE_NOT_FOUND; + return bus->ops->read(bus, devfn, reg, len, val); +} + +int raw_pci_write(unsigned int domain, unsigned int busn, unsigned int devfn, + int reg, int len, u32 val) +{ + struct pci_bus *bus = pci_find_bus(domain, busn); + + if (!bus) + return PCIBIOS_DEVICE_NOT_FOUND; + return bus->ops->write(bus, devfn, reg, len, val); +} diff --git a/drivers/pci/ecam.h b/drivers/pci/ecam.h index 1ad2176..1cccf57 100644 --- a/drivers/pci/ecam.h +++ b/drivers/pci/ecam.h @@ -45,6 +45,11 @@ struct pci_config_window { void __iomem *win; /* 64-bit single mapping */ void __iomem **winp; /* 32-bit per bus mapping */ }; +#ifdef CONFIG_ACPI_PCI_HOST_GENERIC + struct acpi_device *companion; /* ACPI companion device */ +#endif + int domain; + }; /* create and free for pci_config_window */ diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index 1baa515..42ff844 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -111,6 +111,10 @@ static inline void acpi_pci_add_bus(struct pci_bus *bus) { } static inline void acpi_pci_remove_bus(struct pci_bus *bus) { } #endif /* CONFIG_ACPI */ +#ifdef CONFIG_ACPI_PCI_HOST_GENERIC +void acpi_pci_set_companion(struct pci_host_bridge *bridge); +int acpi_pci_bus_domain_nr(struct pci_bus *bus); +#else static inline void acpi_pci_set_companion(struct pci_host_bridge *bridge) { } @@ -119,6 +123,7 @@ static inline int acpi_pci_bus_domain_nr(struct pci_bus *bus) { return 0; } +#endif #ifdef CONFIG_ACPI_APEI extern bool aer_acpi_firmware_first(void); diff --git a/include/linux/pci.h b/include/linux/pci.h index d6ea6ce..b2e8886 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1722,7 +1722,10 @@ void pcibios_free_irq(struct pci_dev *dev); extern struct dev_pm_ops pcibios_pm_ops; #endif -#ifdef CONFIG_PCI_MMCONFIG +#if defined(CONFIG_PCI_MMCONFIG) || defined(CONFIG_ACPI_PCI_HOST_GENERIC) +struct acpi_device; +phys_addr_t pci_mcfg_lookup(struct acpi_device *device, u16 seg, + struct resource *bus_res); void __init pci_mmcfg_early_init(void); void __init pci_mmcfg_late_init(void); #else