drivers/acpi/pci_irq.c

Source file repositories/reference/linux-study-clean/drivers/acpi/pci_irq.c

File Facts

System
Linux kernel
Corpus path
drivers/acpi/pci_irq.c
Extension
.c
Size
13574 bytes
Lines
521
Domain
Driver Families
Bucket
drivers/acpi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct acpi_prt_entry {
	struct acpi_pci_id	id;
	u8			pin;
	acpi_handle		link;
	u32			index;		/* GSI, or link _CRS index */
};

static inline char pin_name(int pin)
{
	return 'A' + pin - 1;
}

/* --------------------------------------------------------------------------
                         PCI IRQ Routing Table (PRT) Support
   -------------------------------------------------------------------------- */

/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
static const struct dmi_system_id medion_md9580[] = {
	{
		.ident = "Medion MD9580-F laptop",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
			DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
		},
	},
	{ }
};

/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
static const struct dmi_system_id dell_optiplex[] = {
	{
		.ident = "Dell Optiplex GX1",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
		},
	},
	{ }
};

/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
static const struct dmi_system_id hp_t5710[] = {
	{
		.ident = "HP t5710",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
			DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
		},
	},
	{ }
};

struct prt_quirk {
	const struct dmi_system_id *system;
	unsigned int		segment;
	unsigned int		bus;
	unsigned int		device;
	unsigned char		pin;
	const char		*source;	/* according to BIOS */
	const char		*actual_source;
};

#define PCI_INTX_PIN(c)		(c - 'A' + 1)

/*
 * These systems have incorrect _PRT entries.  The BIOS claims the PCI
 * interrupt at the listed segment/bus/device/pin is connected to the first
 * link device, but it is actually connected to the second.
 */
static const struct prt_quirk prt_quirks[] = {
	{ medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
		"\\_SB_.PCI0.ISA_.LNKA",
		"\\_SB_.PCI0.ISA_.LNKB"},
	{ dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
		"\\_SB_.LNKB",
		"\\_SB_.LNKA"},
	{ hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
		"\\_SB_.PCI0.LNK1",
		"\\_SB_.PCI0.LNK3"},
};

static void do_prt_fixups(struct acpi_prt_entry *entry,
			  struct acpi_pci_routing_table *prt)
{
	int i;
	const struct prt_quirk *quirk;

	for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
		quirk = &prt_quirks[i];

Annotation

Implementation Notes