Re: [Linaro-acpi] [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@linaro.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 */