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Commit aa5d2b51 authored by Yu Zhao's avatar Yu Zhao Committed by David Woodhouse
Browse files

VT-d: parse ATSR in DMA Remapping Reporting Structure 



Parse the Root Port ATS Capability Reporting Structure in the DMA
Remapping Reporting Structure ACPI table.

Signed-off-by: default avatarYu Zhao <yu.zhao@intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent e277d2fc

drivers/pci/dmar.c

+106 −6
Original line number Diff line number Diff line
@@ -267,6 +267,84 @@ rmrr_parse_dev(struct dmar_rmrr_unit *rmrru) 
	}

	return ret;

}



static LIST_HEAD(dmar_atsr_units);



static int __init dmar_parse_one_atsr(struct acpi_dmar_header *hdr)

{

	struct acpi_dmar_atsr *atsr;

	struct dmar_atsr_unit *atsru;



	atsr = container_of(hdr, struct acpi_dmar_atsr, header);

	atsru = kzalloc(sizeof(*atsru), GFP_KERNEL);

	if (!atsru)

		return -ENOMEM;



	atsru->hdr = hdr;

	atsru->include_all = atsr->flags & 0x1;



	list_add(&atsru->list, &dmar_atsr_units);



	return 0;

}



static int __init atsr_parse_dev(struct dmar_atsr_unit *atsru)

{

	int rc;

	struct acpi_dmar_atsr *atsr;



	if (atsru->include_all)

		return 0;



	atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);

	rc = dmar_parse_dev_scope((void *)(atsr + 1),

				(void *)atsr + atsr->header.length,

				&atsru->devices_cnt, &atsru->devices,

				atsr->segment);

	if (rc || !atsru->devices_cnt) {

		list_del(&atsru->list);

		kfree(atsru);

	}



	return rc;

}



int dmar_find_matched_atsr_unit(struct pci_dev *dev)

{

	int i;

	struct pci_bus *bus;

	struct acpi_dmar_atsr *atsr;

	struct dmar_atsr_unit *atsru;



	list_for_each_entry(atsru, &dmar_atsr_units, list) {

		atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);

		if (atsr->segment == pci_domain_nr(dev->bus))

			goto found;

	}



	return 0;



found:

	for (bus = dev->bus; bus; bus = bus->parent) {

		struct pci_dev *bridge = bus->self;



		if (!bridge || !bridge->is_pcie ||

		    bridge->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE)

			return 0;



		if (bridge->pcie_type == PCI_EXP_TYPE_ROOT_PORT) {

			for (i = 0; i < atsru->devices_cnt; i++)

				if (atsru->devices[i] == bridge)

					return 1;

			break;

		}

	}



	if (atsru->include_all)

		return 1;



	return 0;

}

#endif



static void __init
@@ -274,22 +352,28 @@ dmar_table_print_dmar_entry(struct acpi_dmar_header *header) 
{

	struct acpi_dmar_hardware_unit *drhd;

	struct acpi_dmar_reserved_memory *rmrr;

	struct acpi_dmar_atsr *atsr;



	switch (header->type) {

	case ACPI_DMAR_TYPE_HARDWARE_UNIT:

		drhd = (struct acpi_dmar_hardware_unit *)header;

		drhd = container_of(header, struct acpi_dmar_hardware_unit,

				    header);

		printk (KERN_INFO PREFIX

			"DRHD (flags: 0x%08x)base: 0x%016Lx\n",

			drhd->flags, (unsigned long long)drhd->address);

			"DRHD base: %#016Lx flags: %#x\n",

			(unsigned long long)drhd->address, drhd->flags);

		break;

	case ACPI_DMAR_TYPE_RESERVED_MEMORY:

		rmrr = (struct acpi_dmar_reserved_memory *)header;



		rmrr = container_of(header, struct acpi_dmar_reserved_memory,

				    header);

		printk (KERN_INFO PREFIX

			"RMRR base: 0x%016Lx end: 0x%016Lx\n",

			"RMRR base: %#016Lx end: %#016Lx\n",

			(unsigned long long)rmrr->base_address,

			(unsigned long long)rmrr->end_address);

		break;

	case ACPI_DMAR_TYPE_ATSR:

		atsr = container_of(header, struct acpi_dmar_atsr, header);

		printk(KERN_INFO PREFIX "ATSR flags: %#x\n", atsr->flags);

		break;

	}

}
@@ -361,6 +445,11 @@ parse_dmar_table(void) 
		case ACPI_DMAR_TYPE_RESERVED_MEMORY:

#ifdef CONFIG_DMAR

			ret = dmar_parse_one_rmrr(entry_header);

#endif

			break;

		case ACPI_DMAR_TYPE_ATSR:

#ifdef CONFIG_DMAR

			ret = dmar_parse_one_atsr(entry_header);

#endif

			break;

		default:
@@ -431,11 +520,19 @@ int __init dmar_dev_scope_init(void) 
#ifdef CONFIG_DMAR

	{

		struct dmar_rmrr_unit *rmrr, *rmrr_n;

		struct dmar_atsr_unit *atsr, *atsr_n;



		list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) {

			ret = rmrr_parse_dev(rmrr);

			if (ret)

				return ret;

		}



		list_for_each_entry_safe(atsr, atsr_n, &dmar_atsr_units, list) {

			ret = atsr_parse_dev(atsr);

			if (ret)

				return ret;

		}

	}

#endif
@@ -468,6 +565,9 @@ int __init dmar_table_init(void) 
#ifdef CONFIG_DMAR

	if (list_empty(&dmar_rmrr_units))

		printk(KERN_INFO PREFIX "No RMRR found\n");



	if (list_empty(&dmar_atsr_units))

		printk(KERN_INFO PREFIX "No ATSR found\n");

#endif



#ifdef CONFIG_INTR_REMAP

include/linux/dmar.h

+9 −0
Original line number Diff line number Diff line
@@ -185,6 +185,15 @@ struct dmar_rmrr_unit { 


#define for_each_rmrr_units(rmrr) \

	list_for_each_entry(rmrr, &dmar_rmrr_units, list)



struct dmar_atsr_unit {

	struct list_head list;		/* list of ATSR units */

	struct acpi_dmar_header *hdr;	/* ACPI header */

	struct pci_dev **devices;	/* target devices */

	int devices_cnt;		/* target device count */

	u8 include_all:1;		/* include all ports */

};



/* Intel DMAR  initialization functions */

extern int intel_iommu_init(void);

#else

include/linux/intel-iommu.h

+1 −0
Original line number Diff line number Diff line
@@ -331,6 +331,7 @@ static inline void __iommu_flush_cache( 
}



extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);

extern int dmar_find_matched_atsr_unit(struct pci_dev *dev);



extern int alloc_iommu(struct dmar_drhd_unit *drhd);

extern void free_iommu(struct intel_iommu *iommu);