Commit 20f3097b authored by Suresh Siddha's avatar Suresh Siddha Committed by Thomas Gleixner
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intr-remap: generic support for remapping HPET MSIs 



Generic support for remapping HPET MSI's by parsing the HPET timer block
device scope in the ACPI DRHD tables. This is needed for platforms
supporting interrupt-remapping and MSI capable HPET timer block.

Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Jay Fenlason <fenlason@redhat.com>
LKML-Reference: <20090804190729.477649000@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 5946fa3d

drivers/pci/intr_remapping.c

+85 −4
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#include <linux/dmar.h>

#include <linux/spinlock.h>

#include <linux/jiffies.h>

#include <linux/hpet.h>

#include <linux/pci.h>

#include <linux/irq.h>

#include <asm/io_apic.h>
@@ -14,7 +15,8 @@ 
#include "pci.h"



static struct ioapic_scope ir_ioapic[MAX_IO_APICS];

static int ir_ioapic_num;

static struct hpet_scope ir_hpet[MAX_HPET_TBS];

static int ir_ioapic_num, ir_hpet_num;

int intr_remapping_enabled;



static int disable_intremap;
@@ -351,6 +353,16 @@ int flush_irte(int irq) 
	return rc;

}



struct intel_iommu *map_hpet_to_ir(u8 hpet_id)

{

	int i;



	for (i = 0; i < MAX_HPET_TBS; i++)

		if (ir_hpet[i].id == hpet_id)

			return ir_hpet[i].iommu;

	return NULL;

}



struct intel_iommu *map_ioapic_to_ir(int apic)

{

	int i;
@@ -478,6 +490,36 @@ int set_ioapic_sid(struct irte *irte, int apic) 
	return 0;

}



int set_hpet_sid(struct irte *irte, u8 id)

{

	int i;

	u16 sid = 0;



	if (!irte)

		return -1;



	for (i = 0; i < MAX_HPET_TBS; i++) {

		if (ir_hpet[i].id == id) {

			sid = (ir_hpet[i].bus << 8) | ir_hpet[i].devfn;

			break;

		}

	}



	if (sid == 0) {

		pr_warning("Failed to set source-id of HPET block (%d)\n", id);

		return -1;

	}



	/*

	 * Should really use SQ_ALL_16. Some platforms are broken.

	 * While we figure out the right quirks for these broken platforms, use

	 * SQ_13_IGNORE_3 for now.

	 */

	set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_13_IGNORE_3, sid);



	return 0;

}



int set_msi_sid(struct irte *irte, struct pci_dev *dev)

{

	struct pci_dev *bridge;
@@ -711,6 +753,34 @@ error: 
	return -1;

}



static void ir_parse_one_hpet_scope(struct acpi_dmar_device_scope *scope,

				      struct intel_iommu *iommu)

{

	struct acpi_dmar_pci_path *path;

	u8 bus;

	int count;



	bus = scope->bus;

	path = (struct acpi_dmar_pci_path *)(scope + 1);

	count = (scope->length - sizeof(struct acpi_dmar_device_scope))

		/ sizeof(struct acpi_dmar_pci_path);



	while (--count > 0) {

		/*

		 * Access PCI directly due to the PCI

		 * subsystem isn't initialized yet.

		 */

		bus = read_pci_config_byte(bus, path->dev, path->fn,

					   PCI_SECONDARY_BUS);

		path++;

	}

	ir_hpet[ir_hpet_num].bus   = bus;

	ir_hpet[ir_hpet_num].devfn = PCI_DEVFN(path->dev, path->fn);

	ir_hpet[ir_hpet_num].iommu = iommu;

	ir_hpet[ir_hpet_num].id    = scope->enumeration_id;

	ir_hpet_num++;

}



static void ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope,

				      struct intel_iommu *iommu)

{
@@ -740,7 +810,7 @@ static void ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope, 
	ir_ioapic_num++;

}



static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,

static int ir_parse_ioapic_hpet_scope(struct acpi_dmar_header *header,

				      struct intel_iommu *iommu)

{

	struct acpi_dmar_hardware_unit *drhd;
@@ -765,6 +835,17 @@ static int ir_parse_ioapic_scope(struct acpi_dmar_header *header, 
			       drhd->address);



			ir_parse_one_ioapic_scope(scope, iommu);

		} else if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_HPET) {

			if (ir_hpet_num == MAX_HPET_TBS) {

				printk(KERN_WARNING "Exceeded Max HPET blocks\n");

				return -1;

			}



			printk(KERN_INFO "HPET id %d under DRHD base"

			       " 0x%Lx\n", scope->enumeration_id,

			       drhd->address);



			ir_parse_one_hpet_scope(scope, iommu);

		}

		start += scope->length;

	}
@@ -785,7 +866,7 @@ int __init parse_ioapics_under_ir(void) 
		struct intel_iommu *iommu = drhd->iommu;



		if (ecap_ir_support(iommu->ecap)) {

			if (ir_parse_ioapic_scope(drhd->hdr, iommu))

			if (ir_parse_ioapic_hpet_scope(drhd->hdr, iommu))

				return -1;



			ir_supported = 1;

drivers/pci/intr_remapping.h

+7 −0
Original line number Diff line number Diff line
@@ -7,4 +7,11 @@ struct ioapic_scope { 
	unsigned int devfn;	/* PCI devfn number */

};



struct hpet_scope {

	struct intel_iommu *iommu;

	u8 id;

	unsigned int bus;

	unsigned int devfn;

};



#define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0)

include/linux/dmar.h

+10 −0
Original line number Diff line number Diff line
@@ -126,7 +126,9 @@ extern int free_irte(int irq); 
extern int irq_remapped(int irq);

extern struct intel_iommu *map_dev_to_ir(struct pci_dev *dev);

extern struct intel_iommu *map_ioapic_to_ir(int apic);

extern struct intel_iommu *map_hpet_to_ir(u8 id);

extern int set_ioapic_sid(struct irte *irte, int apic);

extern int set_hpet_sid(struct irte *irte, u8 id);

extern int set_msi_sid(struct irte *irte, struct pci_dev *dev);

#else

static inline int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
@@ -158,10 +160,18 @@ static inline struct intel_iommu *map_ioapic_to_ir(int apic) 
{

	return NULL;

}

static inline struct intel_iommu *map_hpet_to_ir(unsigned int hpet_id)

{

	return NULL;

}

static inline int set_ioapic_sid(struct irte *irte, int apic)

{

	return 0;

}

static inline int set_hpet_sid(struct irte *irte, u8 id)

{

	return -1;

}

static inline int set_msi_sid(struct irte *irte, struct pci_dev *dev)

{

	return 0;

include/linux/hpet.h

+2 −0
Original line number Diff line number Diff line
@@ -126,4 +126,6 @@ struct hpet_info { 
#define	HPET_DPI	_IO('h', 0x05)	/* disable periodic */

#define	HPET_IRQFREQ	_IOW('h', 0x6, unsigned long)	/* IRQFREQ usec */



#define MAX_HPET_TBS	8		/* maximum hpet timer blocks */



#endif				/* !__HPET__ */

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