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Date: Fri, 13 Mar 2015 12:35:00 -0400
From: Mark Salter <msalter@...hat.com>
To: Tomasz Nowicki <tomasz.nowicki@...aro.org>
Cc: bhelgaas@...gle.com, wangyijing@...wei.com, arnd@...db.de,
hanjun.guo@...aro.org, Liviu.Dudau@....com, tglx@...utronix.de,
mingo@...hat.com, hpa@...or.com, rjw@...ysocki.net,
al.stone@...aro.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, x86@...nel.org,
linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v3 4/9] x86, pci, acpi: Move arch-agnostic MMCONFIG (aka
ECAM) and ACPI code out of arch/x86/ directory
On Tue, 2015-03-10 at 12:35 +0100, Tomasz Nowicki wrote:
> ECAM standard and MCFG table are architecture independent and it makes
> sense to share common code across all architectures. Both are going to
> corresponding files - ecam.c and mcfg.c
>
> While we are here, rename pci_parse_mcfg to acpi_parse_mcfg.
> We already have acpi_parse_mcfg prototype which is used nowhere.
> At the same time, we need pci_parse_mcfg been global so acpi_parse_mcfg
> can be used perfectly here.
>
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> ---
> arch/x86/Kconfig | 2 +
> arch/x86/include/asm/pci_x86.h | 33 -----
> arch/x86/pci/acpi.c | 1 +
> arch/x86/pci/mmconfig-shared.c | 296 +----------------------------------------
> arch/x86/pci/mmconfig_32.c | 1 +
> arch/x86/pci/mmconfig_64.c | 1 +
> arch/x86/pci/numachip.c | 1 +
> drivers/acpi/Makefile | 1 +
> drivers/acpi/mcfg.c | 81 +++++++++++
> drivers/pci/Kconfig | 4 +
> drivers/pci/Makefile | 5 +
> drivers/pci/ecam.c | 243 +++++++++++++++++++++++++++++++++
> include/linux/ecam.h | 51 +++++++
> 13 files changed, 394 insertions(+), 326 deletions(-)
> create mode 100644 drivers/acpi/mcfg.c
> create mode 100644 drivers/pci/ecam.c
> create mode 100644 include/linux/ecam.h
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index c2fb8a8..dd926f4 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2276,6 +2276,7 @@ config PCI_DIRECT
>
> config PCI_MMCONFIG
> def_bool y
> + select PCI_ECAM
> depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
>
> config PCI_OLPC
> @@ -2293,6 +2294,7 @@ config PCI_DOMAINS
>
> config PCI_MMCONFIG
> bool "Support mmconfig PCI config space access"
> + select PCI_ECAM
> depends on X86_64 && PCI && ACPI
>
> config PCI_CNB20LE_QUIRK
> diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
> index c57c225..e8a237f 100644
> --- a/arch/x86/include/asm/pci_x86.h
> +++ b/arch/x86/include/asm/pci_x86.h
> @@ -122,41 +122,8 @@ extern int pci_legacy_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_mmio_ops {
> - u32 (*read)(int len, void __iomem *addr);
> - void (*write)(int len, void __iomem *addr, u32 value);
> -};
> -
> -extern int __init pci_mmcfg_arch_init(void);
> -extern void __init pci_mmcfg_arch_free(void);
> -extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
> -extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
> extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
> phys_addr_t addr);
> -extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
> -extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
> -extern u32 pci_mmio_read(int len, void __iomem *addr);
> -extern void pci_mmio_write(int len, void __iomem *addr, u32 value);
> -extern void pci_mmconfig_register_mmio(struct pci_mmcfg_mmio_ops *ops);
> -
> -extern struct list_head pci_mmcfg_list;
> -
> -#define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20)
>
> /*
> * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
> diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
> index 6ac2738..5dfccef 100644
> --- a/arch/x86/pci/acpi.c
> +++ b/arch/x86/pci/acpi.c
> @@ -4,6 +4,7 @@
> #include <linux/irq.h>
> #include <linux/dmi.h>
> #include <linux/slab.h>
> +#include <linux/ecam.h>
> #include <asm/numa.h>
> #include <asm/pci_x86.h>
>
> diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
> index 685cd4c..5064302 100644
> --- a/arch/x86/pci/mmconfig-shared.c
> +++ b/arch/x86/pci/mmconfig-shared.c
> @@ -18,6 +18,7 @@
> #include <linux/slab.h>
> #include <linux/mutex.h>
> #include <linux/rculist.h>
> +#include <linux/ecam.h>
> #include <asm/e820.h>
> #include <asm/pci_x86.h>
> #include <asm/acpi.h>
> @@ -27,52 +28,6 @@
> /* Indicate if the mmcfg resources have been placed into the resource table. */
> static bool pci_mmcfg_running_state;
> static bool pci_mmcfg_arch_init_failed;
> -static DEFINE_MUTEX(pci_mmcfg_lock);
> -
> -LIST_HEAD(pci_mmcfg_list);
> -
> -static u32
> -pci_mmconfig_generic_read(int len, void __iomem *addr)
> -{
> - u32 data = 0;
> -
> - switch (len) {
> - case 1:
> - data = readb(addr);
> - break;
> - case 2:
> - data = readw(addr);
> - break;
> - case 4:
> - data = readl(addr);
> - break;
> - }
> -
> - return data;
> -}
> -
> -static void
> -pci_mmconfig_generic_write(int len, void __iomem *addr, u32 value)
> -{
> - switch (len) {
> - case 1:
> - writeb(value, addr);
> - break;
> - case 2:
> - writew(value, addr);
> - break;
> - case 4:
> - writel(value, addr);
> - break;
> - }
> -}
> -
> -static struct pci_mmcfg_mmio_ops pci_mmcfg_mmio_default = {
> - .read = pci_mmconfig_generic_read,
> - .write = pci_mmconfig_generic_write,
> -};
> -
> -static struct pci_mmcfg_mmio_ops *pci_mmcfg_mmio = &pci_mmcfg_mmio_default;
>
> static u32
> pci_mmconfig_amd_read(int len, void __iomem *addr)
> @@ -115,128 +70,6 @@ static struct pci_mmcfg_mmio_ops pci_mmcfg_mmio_amd_fam10h = {
> .write = pci_mmconfig_amd_write,
> };
>
> -void
> -pci_mmconfig_register_mmio(struct pci_mmcfg_mmio_ops *ops)
> -{
> - pci_mmcfg_mmio = ops;
> -}
> -
> -u32
> -pci_mmio_read(int len, void __iomem *addr)
> -{
> - if (!pci_mmcfg_mmio) {
> - pr_err("PCI config space has no accessors !");
> - return 0;
> - }
> -
> - return pci_mmcfg_mmio->read(len, addr);
> -}
> -
> -void
> -pci_mmio_write(int len, void __iomem *addr, u32 value)
> -{
> - if (!pci_mmcfg_mmio) {
> - pr_err("PCI config space has no accessors !");
> - return;
> - }
> -
> - pci_mmcfg_mmio->write(len, addr, value);
> -}
> -
> -static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
> -{
> - if (cfg->res.parent)
> - release_resource(&cfg->res);
> - list_del(&cfg->list);
> - kfree(cfg);
> -}
> -
> -static void __init free_all_mmcfg(void)
> -{
> - struct pci_mmcfg_region *cfg, *tmp;
> -
> - pci_mmcfg_arch_free();
> - list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list)
> - pci_mmconfig_remove(cfg);
> -}
> -
> -static void list_add_sorted(struct pci_mmcfg_region *new)
> -{
> - struct pci_mmcfg_region *cfg;
> -
> - /* keep list sorted by segment and starting bus number */
> - list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) {
> - if (cfg->segment > new->segment ||
> - (cfg->segment == new->segment &&
> - cfg->start_bus >= new->start_bus)) {
> - list_add_tail_rcu(&new->list, &cfg->list);
> - return;
> - }
> - }
> - list_add_tail_rcu(&new->list, &pci_mmcfg_list);
> -}
> -
> -static struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
> - int end, u64 addr)
> -{
> - struct pci_mmcfg_region *new;
> - struct resource *res;
> -
> - if (addr == 0)
> - return NULL;
> -
> - new = kzalloc(sizeof(*new), GFP_KERNEL);
> - if (!new)
> - return NULL;
> -
> - new->address = addr;
> - new->segment = segment;
> - new->start_bus = start;
> - new->end_bus = end;
> -
> - res = &new->res;
> - res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
> - res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1;
> - res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
> - snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN,
> - "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end);
> - res->name = new->name;
> -
> - return new;
> -}
> -
> -static struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
> - int end, u64 addr)
> -{
> - struct pci_mmcfg_region *new;
> -
> - new = pci_mmconfig_alloc(segment, start, end, addr);
> - if (new) {
> - mutex_lock(&pci_mmcfg_lock);
> - list_add_sorted(new);
> - mutex_unlock(&pci_mmcfg_lock);
> -
> - pr_info(PREFIX
> - "MMCONFIG for domain %04x [bus %02x-%02x] at %pR "
> - "(base %#lx)\n",
> - segment, start, end, &new->res, (unsigned long)addr);
> - }
> -
> - return new;
> -}
> -
> -struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus)
> -{
> - struct pci_mmcfg_region *cfg;
> -
> - list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
> - if (cfg->segment == segment &&
> - cfg->start_bus <= bus && bus <= cfg->end_bus)
> - return cfg;
> -
> - return NULL;
> -}
> -
> static const char *__init pci_mmcfg_e7520(void)
> {
> u32 win;
> @@ -657,73 +490,6 @@ static void __init pci_mmcfg_reject_broken(int early)
> }
> }
>
> -static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
> - struct acpi_mcfg_allocation *cfg)
> -{
> - int year;
> -
> - if (cfg->address < 0xFFFFFFFF)
> - return 0;
> -
> - if (!strncmp(mcfg->header.oem_id, "SGI", 3))
> - return 0;
> -
> - if (mcfg->header.revision >= 1) {
> - if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) &&
> - year >= 2010)
> - return 0;
> - }
> -
> - pr_err(PREFIX "MCFG region for %04x [bus %02x-%02x] at %#llx "
> - "is above 4GB, ignored\n", cfg->pci_segment,
> - cfg->start_bus_number, cfg->end_bus_number, cfg->address);
> - return -EINVAL;
> -}
This looks very arch-specific. Shouldn't this be only generic checks
with some hook for architectures to add arch-specific checks?
> -
> -static int __init pci_parse_mcfg(struct acpi_table_header *header)
> -{
> - struct acpi_table_mcfg *mcfg;
> - struct acpi_mcfg_allocation *cfg_table, *cfg;
> - unsigned long i;
> - int entries;
> -
> - if (!header)
> - return -EINVAL;
> -
> - mcfg = (struct acpi_table_mcfg *)header;
> -
> - /* how many config structures do we have */
> - free_all_mmcfg();
> - entries = 0;
> - i = header->length - sizeof(struct acpi_table_mcfg);
> - while (i >= sizeof(struct acpi_mcfg_allocation)) {
> - entries++;
> - i -= sizeof(struct acpi_mcfg_allocation);
> - }
> - if (entries == 0) {
> - pr_err(PREFIX "MMCONFIG has no entries\n");
> - return -ENODEV;
> - }
> -
> - cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1];
> - for (i = 0; i < entries; i++) {
> - cfg = &cfg_table[i];
> - if (acpi_mcfg_check_entry(mcfg, cfg)) {
> - free_all_mmcfg();
> - return -ENODEV;
> - }
> -
> - if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number,
> - cfg->end_bus_number, cfg->address) == NULL) {
> - pr_warn(PREFIX "no memory for MCFG entries\n");
> - free_all_mmcfg();
> - return -ENOMEM;
> - }
> - }
> -
> - return 0;
> -}
> -
> #ifdef CONFIG_ACPI_APEI
> extern int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size,
> void *data), void *data);
> @@ -782,7 +548,7 @@ void __init pci_mmcfg_early_init(void)
> if (pci_mmcfg_check_hostbridge())
> known_bridge = 1;
> else
> - acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
> + acpi_sfi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
> __pci_mmcfg_init(1);
>
> set_apei_filter();
> @@ -800,7 +566,7 @@ void __init pci_mmcfg_late_init(void)
>
> /* MMCONFIG hasn't been enabled yet, try again */
> if (pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF) {
> - acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
> + acpi_sfi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
> __pci_mmcfg_init(0);
> }
> }
> @@ -834,39 +600,6 @@ static int __init pci_mmcfg_late_insert_resources(void)
> */
> late_initcall(pci_mmcfg_late_insert_resources);
>
> -static int pci_mmconfig_inject(struct pci_mmcfg_region *cfg)
> -{
> - struct pci_mmcfg_region *cfg_conflict;
> - int err = 0;
> -
> - mutex_lock(&pci_mmcfg_lock);
> - cfg_conflict = pci_mmconfig_lookup(cfg->segment, cfg->start_bus);
> - if (cfg_conflict) {
> - if (cfg_conflict->end_bus < cfg->end_bus)
> - pr_info(FW_INFO "MMCONFIG for "
> - "domain %04x [bus %02x-%02x] "
> - "only partially covers this bridge\n",
> - cfg_conflict->segment, cfg_conflict->start_bus,
> - cfg_conflict->end_bus);
> - err = -EEXIST;
> - goto out;
> - }
> -
> - if (pci_mmcfg_arch_map(cfg)) {
> - pr_warn("fail to map MMCONFIG %pR.\n", &cfg->res);
> - err = -ENOMEM;
> - goto out;
> - } else {
> - list_add_sorted(cfg);
> - pr_info("MMCONFIG at %pR (base %#lx)\n",
> - &cfg->res, (unsigned long)cfg->address);
> -
> - }
> -out:
> - mutex_unlock(&pci_mmcfg_lock);
> - return err;
> -}
> -
> /* Add MMCFG information for host bridges */
> int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
> phys_addr_t addr)
> @@ -915,26 +648,3 @@ error:
> kfree(cfg);
> return rc;
> }
> -
> -/* Delete MMCFG information for host bridges */
> -int pci_mmconfig_delete(u16 seg, u8 start, u8 end)
> -{
> - struct pci_mmcfg_region *cfg;
> -
> - mutex_lock(&pci_mmcfg_lock);
> - list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
> - if (cfg->segment == seg && cfg->start_bus == start &&
> - cfg->end_bus == end) {
> - list_del_rcu(&cfg->list);
> - synchronize_rcu();
> - pci_mmcfg_arch_unmap(cfg);
> - if (cfg->res.parent)
> - release_resource(&cfg->res);
> - mutex_unlock(&pci_mmcfg_lock);
> - kfree(cfg);
> - return 0;
> - }
> - mutex_unlock(&pci_mmcfg_lock);
> -
> - return -ENOENT;
> -}
> diff --git a/arch/x86/pci/mmconfig_32.c b/arch/x86/pci/mmconfig_32.c
> index 4b3d025..5cf6291 100644
> --- a/arch/x86/pci/mmconfig_32.c
> +++ b/arch/x86/pci/mmconfig_32.c
> @@ -12,6 +12,7 @@
> #include <linux/pci.h>
> #include <linux/init.h>
> #include <linux/rcupdate.h>
> +#include <linux/ecam.h>
> #include <asm/e820.h>
> #include <asm/pci_x86.h>
>
> diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
> index 032593d..b62ff18 100644
> --- a/arch/x86/pci/mmconfig_64.c
> +++ b/arch/x86/pci/mmconfig_64.c
> @@ -10,6 +10,7 @@
> #include <linux/acpi.h>
> #include <linux/bitmap.h>
> #include <linux/rcupdate.h>
> +#include <linux/ecam.h>
> #include <asm/e820.h>
> #include <asm/pci_x86.h>
>
> diff --git a/arch/x86/pci/numachip.c b/arch/x86/pci/numachip.c
> index 5047e9b..01868b6 100644
> --- a/arch/x86/pci/numachip.c
> +++ b/arch/x86/pci/numachip.c
> @@ -13,6 +13,7 @@
> *
> */
>
> +#include <linux/ecam.h>
> #include <linux/pci.h>
> #include <asm/pci_x86.h>
>
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index 623b117..39498a1 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -67,6 +67,7 @@ obj-$(CONFIG_ACPI_BUTTON) += button.o
> obj-$(CONFIG_ACPI_FAN) += fan.o
> obj-$(CONFIG_ACPI_VIDEO) += video.o
> obj-$(CONFIG_ACPI_PCI_SLOT) += pci_slot.o
> +obj-$(CONFIG_PCI_MMCONFIG) += mcfg.o
> obj-$(CONFIG_ACPI_PROCESSOR) += processor.o
> obj-y += container.o
> obj-$(CONFIG_ACPI_THERMAL) += thermal.o
> diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c
> new file mode 100644
> index 0000000..a2e2326
> --- /dev/null
> +++ b/drivers/acpi/mcfg.c
> @@ -0,0 +1,81 @@
> +/*
> + * MCFG ACPI table parser.
> + *
> + * 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.
> + *
> + */
> +
> +#include <linux/acpi.h>
> +#include <linux/dmi.h>
> +#include <linux/ecam.h>
> +
> +#define PREFIX "MCFG: "
> +
> +static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
> + struct acpi_mcfg_allocation *cfg)
> +{
> + int year;
> +
> + if (cfg->address < 0xFFFFFFFF)
> + return 0;
> +
> + if (!strncmp(mcfg->header.oem_id, "SGI", 3))
> + return 0;
> +
> + if (mcfg->header.revision >= 1) {
> + if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) &&
> + year >= 2010)
> + return 0;
> + }
> +
> + pr_err(PREFIX "MCFG region for %04x [bus %02x-%02x] at %#llx "
> + "is above 4GB, ignored\n", cfg->pci_segment,
> + cfg->start_bus_number, cfg->end_bus_number, cfg->address);
> + return -EINVAL;
> +}
> +
> +int __init acpi_parse_mcfg(struct acpi_table_header *header)
> +{
> + struct acpi_table_mcfg *mcfg;
> + struct acpi_mcfg_allocation *cfg_table, *cfg;
> + unsigned long i;
> + int entries;
> +
> + if (!header)
> + return -EINVAL;
> +
> + mcfg = (struct acpi_table_mcfg *)header;
> +
> + /* how many config structures do we have */
> + free_all_mmcfg();
> + entries = 0;
> + i = header->length - sizeof(struct acpi_table_mcfg);
> + while (i >= sizeof(struct acpi_mcfg_allocation)) {
> + entries++;
> + i -= sizeof(struct acpi_mcfg_allocation);
> + }
> + if (entries == 0) {
> + pr_err(PREFIX "MCFG table has no entries\n");
> + return -ENODEV;
> + }
> +
> + cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1];
> + for (i = 0; i < entries; i++) {
> + cfg = &cfg_table[i];
> + if (acpi_mcfg_check_entry(mcfg, cfg)) {
> + free_all_mmcfg();
> + return -ENODEV;
> + }
> +
> + if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number,
> + cfg->end_bus_number, cfg->address) == NULL) {
> + pr_warn(PREFIX "no memory for MCFG entries\n");
> + free_all_mmcfg();
> + return -ENOMEM;
> + }
> + }
> +
> + return 0;
> +}
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index 7a8f1c5..e2eb982 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -22,6 +22,10 @@ config PCI_MSI_IRQ_DOMAIN
> depends on PCI_MSI
> select GENERIC_MSI_IRQ_DOMAIN
>
> +config PCI_ECAM
> + bool "Enhanced Configuration Access Mechanism (ECAM)"
> + depends on PCI
> +
> config PCI_DEBUG
> bool "PCI Debugging"
> depends on PCI && DEBUG_KERNEL
> diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
> index 73e4af4..ce7b630 100644
> --- a/drivers/pci/Makefile
> +++ b/drivers/pci/Makefile
> @@ -41,6 +41,11 @@ obj-$(CONFIG_SPARC_LEON) += setup-irq.o
> obj-$(CONFIG_M68K) += setup-irq.o
>
> #
> +# Enhanced Configuration Access Mechanism (ECAM)
> +#
> +obj-$(CONFIG_PCI_ECAM) += ecam.o
> +
> +#
> # ACPI Related PCI FW Functions
> # ACPI _DSM provided firmware instance and string name
> #
> diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
> new file mode 100644
> index 0000000..f540184
> --- /dev/null
> +++ b/drivers/pci/ecam.c
> @@ -0,0 +1,243 @@
> +/*
> + * Arch agnostic direct PCI config space access via
> + * ECAM (Enhanced Configuration Access Mechanism)
> + *
> + * Per-architecture code takes care of the mappings, region validation and
> + * accesses themselves.
> + *
> + * 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.
> + *
> + */
> +
> +#include <linux/mutex.h>
> +#include <linux/rculist.h>
> +#include <linux/ecam.h>
> +
> +#define PREFIX "PCI: "
> +
> +static DEFINE_MUTEX(pci_mmcfg_lock);
> +
> +LIST_HEAD(pci_mmcfg_list);
> +
> +static u32
> +pci_mmconfig_generic_read(int len, void __iomem *addr)
> +{
> + u32 data = 0;
> +
> + switch (len) {
> + case 1:
> + data = readb(addr);
> + break;
> + case 2:
> + data = readw(addr);
> + break;
> + case 4:
> + data = readl(addr);
> + break;
> + }
> +
> + return data;
> +}
> +
> +static void
> +pci_mmconfig_generic_write(int len, void __iomem *addr, u32 value)
> +{
> + switch (len) {
> + case 1:
> + writeb(value, addr);
> + break;
> + case 2:
> + writew(value, addr);
> + break;
> + case 4:
> + writel(value, addr);
> + break;
> + }
> +}
> +
> +static struct pci_mmcfg_mmio_ops pci_mmcfg_mmio_default = {
> + .read = pci_mmconfig_generic_read,
> + .write = pci_mmconfig_generic_write,
> +};
> +
> +static struct pci_mmcfg_mmio_ops *pci_mmcfg_mmio = &pci_mmcfg_mmio_default;
> +
> +void
> +pci_mmconfig_register_mmio(struct pci_mmcfg_mmio_ops *ops)
> +{
> + pci_mmcfg_mmio = ops;
> +}
> +
> +u32
> +pci_mmio_read(int len, void __iomem *addr)
> +{
> + if (!pci_mmcfg_mmio) {
> + pr_err("PCI config space has no accessors !");
> + return 0;
> + }
> +
> + return pci_mmcfg_mmio->read(len, addr);
> +}
> +
> +void
> +pci_mmio_write(int len, void __iomem *addr, u32 value)
> +{
> + if (!pci_mmcfg_mmio) {
> + pr_err("PCI config space has no accessors !");
> + return;
> + }
> +
> + pci_mmcfg_mmio->write(len, addr, value);
> +}
> +
> +static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
> +{
> + if (cfg->res.parent)
> + release_resource(&cfg->res);
> + list_del(&cfg->list);
> + kfree(cfg);
> +}
> +
> +void __init free_all_mmcfg(void)
> +{
> + struct pci_mmcfg_region *cfg, *tmp;
> +
> + pci_mmcfg_arch_free();
> + list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list)
> + pci_mmconfig_remove(cfg);
> +}
> +
> +void list_add_sorted(struct pci_mmcfg_region *new)
> +{
> + struct pci_mmcfg_region *cfg;
> +
> + /* keep list sorted by segment and starting bus number */
> + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) {
> + if (cfg->segment > new->segment ||
> + (cfg->segment == new->segment &&
> + cfg->start_bus >= new->start_bus)) {
> + list_add_tail_rcu(&new->list, &cfg->list);
> + return;
> + }
> + }
> + list_add_tail_rcu(&new->list, &pci_mmcfg_list);
> +}
> +
> +struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
> + int end, u64 addr)
> +{
> + struct pci_mmcfg_region *new;
> + struct resource *res;
> +
> + if (addr == 0)
> + return NULL;
> +
> + new = kzalloc(sizeof(*new), GFP_KERNEL);
> + if (!new)
> + return NULL;
> +
> + new->address = addr;
> + new->segment = segment;
> + new->start_bus = start;
> + new->end_bus = end;
> +
> + res = &new->res;
> + res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
> + res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1;
> + res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
> + snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN,
> + "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end);
> + res->name = new->name;
> +
> + return new;
> +}
> +
> +struct pci_mmcfg_region *pci_mmconfig_add(int segment, int start,
> + int end, u64 addr)
> +{
> + struct pci_mmcfg_region *new;
> +
> + new = pci_mmconfig_alloc(segment, start, end, addr);
> + if (new) {
> + mutex_lock(&pci_mmcfg_lock);
> + list_add_sorted(new);
> + mutex_unlock(&pci_mmcfg_lock);
> +
> + pr_info(PREFIX
> + "MMCONFIG for domain %04x [bus %02x-%02x] at %pR "
> + "(base %#lx)\n",
> + segment, start, end, &new->res, (unsigned long)addr);
> + }
> +
> + return new;
> +}
> +
> +struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus)
> +{
> + struct pci_mmcfg_region *cfg;
> +
> + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
> + if (cfg->segment == segment &&
> + cfg->start_bus <= bus && bus <= cfg->end_bus)
> + return cfg;
> +
> + return NULL;
> +}
> +
> +/* Delete MMCFG information for host bridges */
> +int pci_mmconfig_delete(u16 seg, u8 start, u8 end)
> +{
> + struct pci_mmcfg_region *cfg;
> +
> + mutex_lock(&pci_mmcfg_lock);
> + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
> + if (cfg->segment == seg && cfg->start_bus == start &&
> + cfg->end_bus == end) {
> + list_del_rcu(&cfg->list);
> + synchronize_rcu();
> + pci_mmcfg_arch_unmap(cfg);
> + if (cfg->res.parent)
> + release_resource(&cfg->res);
> + mutex_unlock(&pci_mmcfg_lock);
> + kfree(cfg);
> + return 0;
> + }
> + mutex_unlock(&pci_mmcfg_lock);
> +
> + return -ENOENT;
> +}
> +
> +int pci_mmconfig_inject(struct pci_mmcfg_region *cfg)
> +{
> + struct pci_mmcfg_region *cfg_conflict;
> + int err = 0;
> +
> + mutex_lock(&pci_mmcfg_lock);
> + cfg_conflict = pci_mmconfig_lookup(cfg->segment, cfg->start_bus);
> + if (cfg_conflict) {
> + if (cfg_conflict->end_bus < cfg->end_bus)
> + pr_info(FW_INFO "MMCONFIG for "
> + "domain %04x [bus %02x-%02x] "
> + "only partially covers this bridge\n",
> + cfg_conflict->segment, cfg_conflict->start_bus,
> + cfg_conflict->end_bus);
> + err = -EEXIST;
> + goto out;
> + }
> +
> + if (pci_mmcfg_arch_map(cfg)) {
> + pr_warn("fail to map MMCONFIG %pR.\n", &cfg->res);
> + err = -ENOMEM;
> + goto out;
> + } else {
> + list_add_sorted(cfg);
> + pr_info("MMCONFIG at %pR (base %#lx)\n",
> + &cfg->res, (unsigned long)cfg->address);
> +
> + }
> +out:
> + mutex_unlock(&pci_mmcfg_lock);
> + return err;
> +}
> diff --git a/include/linux/ecam.h b/include/linux/ecam.h
> new file mode 100644
> index 0000000..2387df5
> --- /dev/null
> +++ b/include/linux/ecam.h
> @@ -0,0 +1,51 @@
> +#ifndef __ECAM_H
> +#define __ECAM_H
> +#ifdef __KERNEL__
> +
> +#include <linux/types.h>
> +#include <linux/acpi.h>
> +
> +/* "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_mmio_ops {
> + u32 (*read)(int len, void __iomem *addr);
> + void (*write)(int len, void __iomem *addr, u32 value);
> +};
> +
> +struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
> +struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
> + int end, u64 addr);
> +int pci_mmconfig_inject(struct pci_mmcfg_region *cfg);
> +struct pci_mmcfg_region *pci_mmconfig_add(int segment, int start,
> + int end, u64 addr);
> +void list_add_sorted(struct pci_mmcfg_region *new);
> +void free_all_mmcfg(void);
> +int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
> +
> +/* Arch specific calls */
> +int pci_mmcfg_arch_init(void);
> +void pci_mmcfg_arch_free(void);
> +int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
> +void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
> +extern u32 pci_mmio_read(int len, void __iomem *addr);
> +extern void pci_mmio_write(int len, void __iomem *addr, u32 value);
> +extern void pci_mmconfig_register_mmio(struct pci_mmcfg_mmio_ops *ops);
> +
> +extern struct list_head pci_mmcfg_list;
> +
> +#define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20)
> +
> +#endif /* __KERNEL__ */
> +#endif /* __ECAM_H */
--
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