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s390: convert interrupt handling to use generic hardirq

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With the introduction of PCI it became apparent that s390 should
convert to generic hardirqs as too many drivers do not have the
correct dependency for GENERIC_HARDIRQS. On the architecture
level s390 does not have irq lines. It has external interrupts,
I/O interrupts and adapter interrupts. This patch hard-codes all
external interrupts as irq #1, all I/O interrupts as irq #2 and
all adapter interrupts as irq #3. The additional information from
the lowcore associated with the interrupt is stored in the
pt_regs of the interrupt frame, where the interrupt handler can
pick it up. For PCI/MSI interrupts the adapter interrupt handler
scans the relevant bit fields and calls generic_handle_irq with
the virtual irq number for the MSI interrupt.

Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2013-06-27 09:01:09 +02:00
commit 1f44a22577
15 changed files with 249 additions and 483 deletions
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16
arch/s390/include/asm/pci.h
View file

@ -53,12 +53,6 @@ struct zpci_fmb {
atomic64_t unmapped_pages;
} __packed __aligned(16);
struct msi_map {
unsigned long irq;
struct msi_desc *msi;
struct hlist_node msi_chain;
};
#define ZPCI_MSI_VEC_BITS 11
#define ZPCI_MSI_VEC_MAX (1 << ZPCI_MSI_VEC_BITS)
#define ZPCI_MSI_VEC_MASK (ZPCI_MSI_VEC_MAX - 1)
@ -92,8 +86,6 @@ struct zpci_dev {
/* IRQ stuff */
u64 msi_addr; /* MSI address */
struct zdev_irq_map *irq_map;
struct msi_map *msi_map;
struct airq_iv *aibv; /* adapter interrupt bit vector */
unsigned int aisb; /* number of the summary bit */
@ -153,14 +145,6 @@ int clp_add_pci_device(u32, u32, int);
int clp_enable_fh(struct zpci_dev *, u8);
int clp_disable_fh(struct zpci_dev *);
/* MSI */
struct msi_desc *__irq_get_msi_desc(unsigned int);
int zpci_msi_set_mask_bits(struct msi_desc *, u32, u32);
int zpci_setup_msi_irq(struct zpci_dev *, struct msi_desc *, unsigned int, int);
void zpci_teardown_msi_irq(struct zpci_dev *, struct msi_desc *);
int zpci_msihash_init(void);
void zpci_msihash_exit(void);
#ifdef CONFIG_PCI
/* Error handling and recovery */
void zpci_event_error(void *);