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Date: Fri, 18 Mar 2016 11:49:54 -0400
From: Mark Salter <msalter@...hat.com>
To: Tomasz Nowicki <tn@...ihalf.com>, helgaas@...nel.org,
arnd@...db.de, will.deacon@....com, catalin.marinas@....com,
rafael@...nel.org, hanjun.guo@...aro.org,
Lorenzo.Pieralisi@....com, okaya@...eaurora.org,
jiang.liu@...ux.intel.com, jchandra@...adcom.com,
Stefano.Stabellini@...citrix.com
Cc: robert.richter@...iumnetworks.com, mw@...ihalf.com,
Liviu.Dudau@....com, ddaney@...iumnetworks.com,
wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
linaro-acpi@...ts.linaro.org, jcm@...hat.com
Subject: Re: [PATCH V5 13/15] pci, acpi: Match PCI config space accessors
against platfrom specific quirks.
On Tue, 2016-02-16 at 14:53 +0100, 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 prior to PCI buses enumeration. Algorithm traverses available quirk
> list, matches against <platform ID (DMI), domain, bus number> tuple and
> returns corresponding accessors. All quirks can be defined using:
> DECLARE_ACPI_MCFG_FIXUP() and kept self contained. Example,
>
> static const struct dmi_system_id foo_dmi[] = {
> {
> .ident = "<Platform ident string>",
> .callback = <handler>,
> .matches = {
> DMI_MATCH(DMI_SYS_VENDOR, "<system vendor>"),
> DMI_MATCH(DMI_PRODUCT_NAME, "<product name>"),
> DMI_MATCH(DMI_PRODUCT_VERSION, "product version"),
> },
> },
> { }
> };
>
> static struct pci_ops foo_ecam_pci_ops = {
> .map_bus = pci_mcfg_dev_base,
> .read = foo_ecam_config_read,
> .write = foo_ecam_config_write,
> };
> DECLARE_ACPI_MCFG_FIXUP(foo_dmi, NULL, &foo_ecam_pci_ops, <domain_nr>, <bus_nr>);
>
> More custom (non-DMI) matching can be done via an extra call.
> Note that there is possibility to assign quirk related private data to
> root->sysdata which will be available along read/wriate accessor, example:
>
> static int boo_match(struct pci_mcfg_fixup *fixup, struct acpi_pci_root *root)
> {
> return [condition] ? 1 : 0;
> }
>
> int boo_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
> int where, int size, u32 *val)
> {
> struct acpi_pci_root *root = bus->sysdata;
> struct boo_priv_data *boo_data = root->sysdata;
>
> [..]
> }
>
> static struct pci_ops boo_ecam_pci_ops = {
> .map_bus = pci_mcfg_dev_base,
> .read = boo_ecam_config_read,
> .write = boo_ecam_config_write,
> };
> DECLARE_ACPI_MCFG_FIXUP(NULL, boo_match, &boo_ecam_pci_ops, <domain_nr>, <bus_nr>);
>
> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
> Tested-by: Duc Dang <dhdang@....com>
> Tested-by: Dongdong Liu <liudongdong3@...wei.com>
> Tested-by: Hanjun Guo <hanjun.guo@...aro.org>
> Tested-by: Graeme Gregory <graeme.gregory@...aro.org>
> Tested-by: Sinan Kaya <okaya@...eaurora.org>
> ---
> drivers/acpi/pci_mcfg.c | 32 ++++++++++++++++++++++++++++++--
> include/acpi/acpi_bus.h | 1 +
> include/asm-generic/vmlinux.lds.h | 7 +++++++
> include/linux/pci-acpi.h | 18 ++++++++++++++++++
> 4 files changed, 56 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
> index 0062257..b343547 100644
> --- a/drivers/acpi/pci_mcfg.c
> +++ b/drivers/acpi/pci_mcfg.c
> @@ -41,6 +41,29 @@ int __weak raw_pci_write(unsigned int domain, unsigned int bus,
> return PCIBIOS_DEVICE_NOT_FOUND;
> }
>
> +extern struct pci_mcfg_fixup __start_acpi_mcfg_fixups[];
> +extern struct pci_mcfg_fixup __end_acpi_mcfg_fixups[];
> +
> +static struct pci_ops *pci_mcfg_check_quirks(struct acpi_pci_root *root)
> +{
> + struct pci_mcfg_fixup *f;
> + int bus_num = root->secondary.start;
> + int domain = root->segment;
> +
> + /*
> + * First match against PCI topology <domain:bus> then use DMI or
> + * custom match handler.
> + */
> + for (f = __start_acpi_mcfg_fixups; f < __end_acpi_mcfg_fixups; f++) {
> + if ((f->domain == domain || f->domain == PCI_MCFG_DOMAIN_ANY) &&
> + (f->bus_num == bus_num || f->bus_num == PCI_MCFG_BUS_ANY) &&
> + (f->system ? dmi_check_system(f->system) : 1 &&
> + f->match ? f->match(f, root) : 1))
The parens are not quite right here ^^^^
If dmi_check_system() returns true, f->match won't get called.
This should be:
(f->system ? dmi_check_system(f->system) : 1) &&
f->match ? f->match(f, root) : 1)
> + return f->ops;
> + }
> + return NULL;
> +}
> +
> void __iomem *
> pci_mcfg_dev_base(struct pci_bus *bus, unsigned int devfn, int offset)
> {
> @@ -63,10 +86,15 @@ static struct pci_ops default_pci_mcfg_ops = {
>
> struct pci_ops *pci_mcfg_get_ops(struct acpi_pci_root *root)
> {
> + struct pci_ops *pci_mcfg_ops_quirk;
> +
> /*
> - * TODO: Match against platform specific quirks and return
> - * corresponding PCI config space accessor set.
> + * Match against platform specific quirks and return corresponding
> + * PCI config space accessor set.
> */
> + pci_mcfg_ops_quirk = pci_mcfg_check_quirks(root);
> + if (pci_mcfg_ops_quirk)
> + return pci_mcfg_ops_quirk;
>
> return &default_pci_mcfg_ops;
> }
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 14362a8..0fc6f13 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -556,6 +556,7 @@ struct acpi_pci_root {
> struct pci_bus *bus;
> u16 segment;
> struct resource secondary; /* downstream bus range */
> + void *sysdata;
>
> u32 osc_support_set; /* _OSC state of support bits */
> u32 osc_control_set; /* _OSC state of control bits */
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index c4bd0e2..c93fc97 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -298,6 +298,13 @@
> VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .; \
> } \
> \
> + /* ACPI MCFG quirks */ \
> + .acpi_fixup : AT(ADDR(.acpi_fixup) - LOAD_OFFSET) { \
> + VMLINUX_SYMBOL(__start_acpi_mcfg_fixups) = .; \
> + *(.acpi_fixup_mcfg) \
> + VMLINUX_SYMBOL(__end_acpi_mcfg_fixups) = .; \
> + } \
> + \
> /* Built-in firmware blobs */ \
> .builtin_fw : AT(ADDR(.builtin_fw) - LOAD_OFFSET) { \
> VMLINUX_SYMBOL(__start_builtin_fw) = .; \
> diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
> index 93feb04..9e1bedd 100644
> --- a/include/linux/pci-acpi.h
> +++ b/include/linux/pci-acpi.h
> @@ -123,6 +123,24 @@ struct pci_mmcfg_region {
> bool hot_added;
> };
>
> +struct pci_mcfg_fixup {
> + const struct dmi_system_id *system;
> + int (*match)(struct pci_mcfg_fixup *, struct acpi_pci_root *);
> + struct pci_ops *ops;
> + int domain;
> + int bus_num;
> +};
> +
> +#define PCI_MCFG_DOMAIN_ANY -1
> +#define PCI_MCFG_BUS_ANY -1
> +
> +/* Designate a routine to fix up buggy MCFG */
> +#define DECLARE_ACPI_MCFG_FIXUP(system, match, ops, dom, bus) \
> + static const struct pci_mcfg_fixup __mcfg_fixup_##system##dom##bus\
> + __used __attribute__((__section__(".acpi_fixup_mcfg"), \
> + aligned((sizeof(void *))))) = \
> + { system, match, ops, dom, bus };
> +
> extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
> extern struct pci_mmcfg_region *pci_mmconfig_add(int segment, int start,
> int end, u64 addr);
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