Commit 95c5e92f authored by Jiang Liu's avatar Jiang Liu Committed by Bjorn Helgaas
Browse files

x86/PCI: prepare pci_mmcfg_check_reserved() to be called at runtime 



Prepare function pci_mmcfg_check_reserved() to be called at runtime
for PCI host bridge hot-plugging

Reviewed-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarJiang Liu <liuj97@gmail.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 9cf0105d

arch/x86/pci/mmconfig-shared.c

+68 −36
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 


/* Indicate if the mmcfg resources have been placed into the resource table. */

static int __initdata pci_mmcfg_resources_inserted;

static bool pci_mmcfg_running_state;

static DEFINE_MUTEX(pci_mmcfg_lock);



LIST_HEAD(pci_mmcfg_list);
@@ -375,13 +376,14 @@ static void __init pci_mmcfg_insert_resources(void) 
	struct pci_mmcfg_region *cfg;



	list_for_each_entry(cfg, &pci_mmcfg_list, list)

		if (!cfg->res.parent)

			insert_resource(&iomem_resource, &cfg->res);



	/* Mark that the resources have been inserted. */

	pci_mmcfg_resources_inserted = 1;

}



static acpi_status __init check_mcfg_resource(struct acpi_resource *res,

static acpi_status __devinit check_mcfg_resource(struct acpi_resource *res,

						 void *data)

{

	struct resource *mcfg_res = data;
@@ -418,7 +420,7 @@ static acpi_status __init check_mcfg_resource(struct acpi_resource *res, 
	return AE_OK;

}



static acpi_status __init find_mboard_resource(acpi_handle handle, u32 lvl,

static acpi_status __devinit find_mboard_resource(acpi_handle handle, u32 lvl,

						  void *context, void **rv)

{

	struct resource *mcfg_res = context;
@@ -432,7 +434,7 @@ static acpi_status __init find_mboard_resource(acpi_handle handle, u32 lvl, 
	return AE_OK;

}



static int __init is_acpi_reserved(u64 start, u64 end, unsigned not_used)

static int __devinit is_acpi_reserved(u64 start, u64 end, unsigned not_used)

{

	struct resource mcfg_res;
@@ -451,13 +453,15 @@ static int __init is_acpi_reserved(u64 start, u64 end, unsigned not_used) 


typedef int (*check_reserved_t)(u64 start, u64 end, unsigned type);



static int __init is_mmconf_reserved(check_reserved_t is_reserved,

				    struct pci_mmcfg_region *cfg, int with_e820)

static int __ref is_mmconf_reserved(check_reserved_t is_reserved,

				    struct pci_mmcfg_region *cfg,

				    struct device *dev, int with_e820)

{

	u64 addr = cfg->res.start;

	u64 size = resource_size(&cfg->res);

	u64 old_size = size;

	int valid = 0, num_buses;

	int num_buses;

	char *method = with_e820 ? "E820" : "ACPI motherboard resources";



	while (!is_reserved(addr, addr + size, E820_RESERVED)) {

		size >>= 1;
@@ -465,11 +469,16 @@ static int __init is_mmconf_reserved(check_reserved_t is_reserved, 
			break;

	}



	if (size >= (16UL<<20) || size == old_size) {

		printk(KERN_INFO PREFIX "MMCONFIG at %pR reserved in %s\n",

		       &cfg->res,

		       with_e820 ? "E820" : "ACPI motherboard resources");

		valid = 1;

	if (size < (16UL<<20) && size != old_size)

		return 0;



	if (dev)

		dev_info(dev, "MMCONFIG at %pR reserved in %s\n",

			 &cfg->res, method);

	else

		printk(KERN_INFO PREFIX

		       "MMCONFIG at %pR reserved in %s\n",

		       &cfg->res, method);



	if (old_size != size) {

		/* update end_bus */
@@ -480,34 +489,55 @@ static int __init is_mmconf_reserved(check_reserved_t is_reserved, 
		snprintf(cfg->name, PCI_MMCFG_RESOURCE_NAME_LEN,

			 "PCI MMCONFIG %04x [bus %02x-%02x]",

			 cfg->segment, cfg->start_bus, cfg->end_bus);



		if (dev)

			dev_info(dev,

				"MMCONFIG "

				"at %pR (base %#lx) (size reduced!)\n",

				&cfg->res, (unsigned long) cfg->address);

		else

			printk(KERN_INFO PREFIX

				"MMCONFIG for %04x [bus%02x-%02x] "

				"at %pR (base %#lx) (size reduced!)\n",

				cfg->segment, cfg->start_bus, cfg->end_bus,

				&cfg->res, (unsigned long) cfg->address);

	}

	}



	return valid;

	return 1;

}



static int __devinit pci_mmcfg_check_reserved(struct pci_mmcfg_region *cfg,

					      int early)

static int __ref pci_mmcfg_check_reserved(struct device *dev,

		  struct pci_mmcfg_region *cfg, int early)

{

	if (!early && !acpi_disabled) {

		if (is_mmconf_reserved(is_acpi_reserved, cfg, 0))

		if (is_mmconf_reserved(is_acpi_reserved, cfg, dev, 0))

			return 1;



		if (dev)

			dev_info(dev, FW_INFO

				 "MMCONFIG at %pR not reserved in "

				 "ACPI motherboard resources\n",

				 &cfg->res);

		else

			printk(KERN_ERR FW_BUG PREFIX

			printk(KERN_INFO FW_INFO PREFIX

			       "MMCONFIG at %pR not reserved in "

			       "ACPI motherboard resources\n",

			       &cfg->res);

	}



	/*

	 * e820_all_mapped() is marked as __init.

	 * All entries from ACPI MCFG table have been checked at boot time.

	 * For MCFG information constructed from hotpluggable host bridge's

	 * _CBA method, just assume it's reserved.

	 */

	if (pci_mmcfg_running_state)

		return 1;



	/* Don't try to do this check unless configuration

	   type 1 is available. how about type 2 ?*/

	if (raw_pci_ops)

		return is_mmconf_reserved(e820_all_mapped, cfg, 1);

		return is_mmconf_reserved(e820_all_mapped, cfg, dev, 1);



	return 0;

}
@@ -517,7 +547,7 @@ static void __init pci_mmcfg_reject_broken(int early) 
	struct pci_mmcfg_region *cfg;



	list_for_each_entry(cfg, &pci_mmcfg_list, list) {

		if (pci_mmcfg_check_reserved(cfg, early) == 0) {

		if (pci_mmcfg_check_reserved(NULL, cfg, early) == 0) {

			printk(KERN_INFO PREFIX "not using MMCONFIG\n");

			free_all_mmcfg();

			return;
@@ -656,6 +686,8 @@ void __init pci_mmcfg_late_init(void) 


static int __init pci_mmcfg_late_insert_resources(void)

{

	pci_mmcfg_running_state = true;



	/*

	 * If resources are already inserted or we are not using MMCONFIG,

	 * don't insert the resources.

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