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Date: Tue, 26 Oct 2021 15:08:20 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Xuesong Chen <xuesong.chen@...ux.alibaba.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Catalin Marinas <catalin.marinas@....com>,
James Morse <james.morse@....com>,
Will Deacon <will@...nel.org>, Tony Luck <tony.luck@...el.com>,
Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
Linux PCI <linux-pci@...r.kernel.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] PCI: MCFG: Consolidate the separate PCI MCFG
table entry list
On Tue, Oct 26, 2021 at 03:14:37PM +0200, Rafael J. Wysocki wrote:
> On Tue, Oct 19, 2021 at 6:50 AM Xuesong Chen
> <xuesong.chen@...ux.alibaba.com> wrote:
> >
> > The PCI MCFG entry list is discrete on x86 and other arches like ARM64
> > in current implementation, this list variable can be consolidated for
> > unnecessary duplication and other purposes, for example, we can remove
> > some of the arch-specific codes in the APEI/EINJ module and re-implement
> > it in a more common arch-agnostic way.
> >
> > To reduce the redundancy, it:
> > - Moves the "struct pci_mmcfg_region" definition from
> > arch/x86/include/asm/pci_x86.h to include/linux/pci.h, where it
> > can be shared across arches.
> >
> > - Moves pci_mmcfg_list (a list of pci_mmcfg_region structs) from
> > arch/x86/pci/mmconfig-shared.c to drivers/pci/pci.c, where it can
> > be shared across arches.
> >
> > - On x86 (which does not enable CONFIG_ACPI_MCFG), pci_mmcfg_list is
> > built in arch/x86/pci/mmconfig-shared.c as before.
> >
> > - Removes the "struct mcfg_entry" from drivers/acpi/pci_mcfg.c.
> >
> > - Replaces pci_mcfg_list (previously a list of mcfg_entry structs)
> > in drivers/acpi/pci_mcfg.c with the newly-shared pci_mmcfg_list (a
> > list of pci_mmcfg_region structs).
> >
> > - On ARM64 (which does enable CONFIG_ACPI_MCFG), pci_mmcfg_list is
> > built in drivers/acpi/pci_mcfg.c.
> >
> > Signed-off-by: Xuesong Chen <xuesong.chen@...ux.alibaba.com>
> > Reviewed-by: Bjorn Helgaas <bhelgaas@...gle.com>
> > Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>
> I'm guessing that I'm expected to pick up this one?
I did not provide a Reviewed-by: tag for this patch (and I don't
think Bjorn provided his either).
That's valid also for patch 2:
https://lore.kernel.org/linux-pci/20211019150405.GA2338201@bhelgaas
> > Cc: Catalin Marinas <catalin.marinas@....com>
> > Cc: James Morse <james.morse@....com>
> > Cc: Will Deacon <will@...nel.org>
> > Cc: Rafael. J. Wysocki <rafael@...nel.org>
> > Cc: Tony Luck <tony.luck@...el.com>
> > Cc: Tomasz Nowicki <tn@...ihalf.com>
> > ---
> > arch/x86/include/asm/pci_x86.h | 17 +----------------
> > arch/x86/pci/mmconfig-shared.c | 2 --
> > drivers/acpi/pci_mcfg.c | 34 +++++++++++++---------------------
> > drivers/pci/pci.c | 2 ++
> > include/linux/pci.h | 17 +++++++++++++++++
> > 5 files changed, 33 insertions(+), 39 deletions(-)
> >
> > diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
> > index 490411d..1f4257c 100644
> > --- a/arch/x86/include/asm/pci_x86.h
> > +++ b/arch/x86/include/asm/pci_x86.h
> > @@ -146,20 +146,7 @@ static inline int __init pci_acpi_init(void)
> > extern void pcibios_fixup_irqs(void);
> >
> > /* pci-mmconfig.c */
> > -
> > -/* "PCI MMCONFIG %04x [bus %02x-%02x]" */
> > -#define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
> > -
> > -struct pci_mmcfg_region {
> > - struct list_head list;
> > - struct resource res;
> > - u64 address;
> > - char __iomem *virt;
> > - u16 segment;
> > - u8 start_bus;
> > - u8 end_bus;
> > - char name[PCI_MMCFG_RESOURCE_NAME_LEN];
> > -};
> > +struct pci_mmcfg_region;
> >
> > extern int __init pci_mmcfg_arch_init(void);
> > extern void __init pci_mmcfg_arch_free(void);
> > @@ -174,8 +161,6 @@ extern struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
> >
> > extern struct list_head pci_mmcfg_list;
> >
> > -#define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20)
> > -
> > /*
> > * On AMD Fam10h CPUs, all PCI MMIO configuration space accesses must use
> > * %eax. No other source or target registers may be used. The following
> > diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
> > index 758cbfe..0b961fe6 100644
> > --- a/arch/x86/pci/mmconfig-shared.c
> > +++ b/arch/x86/pci/mmconfig-shared.c
> > @@ -31,8 +31,6 @@
> > static DEFINE_MUTEX(pci_mmcfg_lock);
> > #define pci_mmcfg_lock_held() lock_is_held(&(pci_mmcfg_lock).dep_map)
> >
> > -LIST_HEAD(pci_mmcfg_list);
> > -
> > static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
> > {
> > if (cfg->res.parent)
> > diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
> > index 53cab97..d9506b0 100644
> > --- a/drivers/acpi/pci_mcfg.c
> > +++ b/drivers/acpi/pci_mcfg.c
> > @@ -13,14 +13,7 @@
> > #include <linux/pci-acpi.h>
> > #include <linux/pci-ecam.h>
> >
> > -/* Structure to hold entries from the MCFG table */
> > -struct mcfg_entry {
> > - struct list_head list;
> > - phys_addr_t addr;
> > - u16 segment;
> > - u8 bus_start;
> > - u8 bus_end;
> > -};
> > +extern struct list_head pci_mmcfg_list;
> >
> > #ifdef CONFIG_PCI_QUIRKS
> > struct mcfg_fixup {
> > @@ -214,16 +207,13 @@ static void pci_mcfg_apply_quirks(struct acpi_pci_root *root,
> > #endif
> > }
> >
> > -/* List to save MCFG entries */
> > -static LIST_HEAD(pci_mcfg_list);
> > -
> > int pci_mcfg_lookup(struct acpi_pci_root *root, struct resource *cfgres,
> > const struct pci_ecam_ops **ecam_ops)
> > {
> > const struct pci_ecam_ops *ops = &pci_generic_ecam_ops;
> > struct resource *bus_res = &root->secondary;
> > u16 seg = root->segment;
> > - struct mcfg_entry *e;
> > + struct pci_mmcfg_region *e;
> > struct resource res;
> >
> > /* Use address from _CBA if present, otherwise lookup MCFG */
> > @@ -233,10 +223,10 @@ int pci_mcfg_lookup(struct acpi_pci_root *root, struct resource *cfgres,
> > /*
> > * We expect the range in bus_res in the coverage of MCFG bus range.
> > */
> > - list_for_each_entry(e, &pci_mcfg_list, list) {
> > - if (e->segment == seg && e->bus_start <= bus_res->start &&
> > - e->bus_end >= bus_res->end) {
> > - root->mcfg_addr = e->addr;
> > + list_for_each_entry(e, &pci_mmcfg_list, list) {
> > + if (e->segment == seg && e->start_bus <= bus_res->start &&
> > + e->end_bus >= bus_res->end) {
> > + root->mcfg_addr = e->address;
> > }
> >
> > }
> > @@ -268,7 +258,7 @@ static __init int pci_mcfg_parse(struct acpi_table_header *header)
> > {
> > struct acpi_table_mcfg *mcfg;
> > struct acpi_mcfg_allocation *mptr;
> > - struct mcfg_entry *e, *arr;
> > + struct pci_mmcfg_region *e, *arr;
> > int i, n;
> >
> > if (header->length < sizeof(struct acpi_table_mcfg))
> > @@ -285,10 +275,12 @@ static __init int pci_mcfg_parse(struct acpi_table_header *header)
> >
> > for (i = 0, e = arr; i < n; i++, mptr++, e++) {
> > e->segment = mptr->pci_segment;
> > - e->addr = mptr->address;
> > - e->bus_start = mptr->start_bus_number;
> > - e->bus_end = mptr->end_bus_number;
> > - list_add(&e->list, &pci_mcfg_list);
> > + e->address = mptr->address;
> > + e->start_bus = mptr->start_bus_number;
> > + e->end_bus = mptr->end_bus_number;
> > + e->res.start = e->address + PCI_MMCFG_BUS_OFFSET(e->start_bus);
> > + e->res.end = e->address + PCI_MMCFG_BUS_OFFSET(e->end_bus + 1) - 1;
> > + list_add(&e->list, &pci_mmcfg_list);
> > }
> >
> > #ifdef CONFIG_PCI_QUIRKS
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index ce2ab62..899004e 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -47,6 +47,8 @@
> > int pci_pci_problems;
> > EXPORT_SYMBOL(pci_pci_problems);
> >
> > +LIST_HEAD(pci_mmcfg_list);
> > +
> > unsigned int pci_pm_d3hot_delay;
> >
> > static void pci_pme_list_scan(struct work_struct *work);
> > diff --git a/include/linux/pci.h b/include/linux/pci.h
> > index cd8aa6f..71e4c06 100644
> > --- a/include/linux/pci.h
> > +++ b/include/linux/pci.h
> > @@ -55,6 +55,23 @@
> > #define PCI_RESET_PROBE true
> > #define PCI_RESET_DO_RESET false
> >
> > +#define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20)
> > +
> > +/* "PCI MMCONFIG %04x [bus %02x-%02x]" */
> > +#define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
> > +
> > +/* pci mcfg region */
> > +struct pci_mmcfg_region {
> > + struct list_head list;
> > + struct resource res;
> > + u64 address;
> > + char __iomem *virt;
> > + u16 segment;
> > + u8 start_bus;
> > + u8 end_bus;
> > + char name[PCI_MMCFG_RESOURCE_NAME_LEN];
> > +};
> > +
> > /*
> > * The PCI interface treats multi-function devices as independent
> > * devices. The slot/function address of each device is encoded
> > --
> > 1.8.3.1
> >
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