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 being 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 0dc9d01..08d8f7f 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2240,6 +2240,7 @@ 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 @@ -2257,6 +2258,7 @@ 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 f7f3b6a..2ea44a7 100644 --- a/arch/x86/include/asm/pci_x86.h +++ b/arch/x86/include/asm/pci_x86.h @@ -124,41 +124,8 @@ 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 cfd1b13..962fd30 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 08d8755..9c25756 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; -} - -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; -} - static void __init __pci_mmcfg_init(int early) { pci_mmcfg_reject_broken(early); @@ -756,7 +522,7 @@ 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); } } @@ -772,7 +538,7 @@ 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); } } @@ -806,39 +572,6 @@ 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) @@ -887,26 +620,3 @@ 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 bcec54e..d9688fc 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -70,6 +70,7 @@ 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 */