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powerpc/irqdomain: Fix broken NR_IRQ references 

The switch from using irq_map to irq_alloc_desc*() for managing irq
number allocations introduced new bugs in some of the powerpc
interrupt code.  Several functions rely on the value of NR_IRQS to
determine the maximum irq number that could get allocated.  However,
with sparse_irq and using irq_alloc_desc*() the maximum possible irq
number is now specified with 'nr_irqs' which may be a number larger
than NR_IRQS.  This has caused breakage on powermac when
CONFIG_NR_IRQS is set to 32.

This patch removes most of the direct references to NR_IRQS in the
powerpc code and replaces them with either a nr_irqs reference or by
using the common for_each_irq_desc() macro.  The powerpc-specific
for_each_irq() macro is removed at the same time.

Also, the Cell axon_msi driver is refactored to remove the global
build assumption on the size of NR_IRQS and instead add a limit to the
maximum irq number when calling irq_domain_add_nomap().

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Grant Likely 2012-04-23 12:30:02 +00:00 committed by Benjamin Herrenschmidt
parent 8751ed14dc
commit 4013369f37
8 changed files with 14 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/include/asm/irq.h
View File

@ -18,10 +18,6 @@
#include <linux/atomic.h>
/* Define a way to iterate across irqs. */
#define for_each_irq(i) \
for ((i) = 0; (i) < NR_IRQS; ++(i))
extern atomic_t ppc_n_lost_interrupts;
/* This number is used when no interrupt has been assigned */

6
arch/powerpc/kernel/irq.c
View File

@ -330,14 +330,10 @@ void migrate_irqs(void)
alloc_cpumask_var(&mask, GFP_KERNEL);
for_each_irq(irq) {
for_each_irq_desc(irq, desc) {
struct irq_data *data;
struct irq_chip *chip;
desc = irq_to_desc(irq);
if (!desc)
continue;
data = irq_desc_get_irq_data(desc);
if (irqd_is_per_cpu(data))
continue;

7
arch/powerpc/kernel/machine_kexec.c
View File

@ -23,14 +23,11 @@
void machine_kexec_mask_interrupts(void) {
unsigned int i;
struct irq_desc *desc;
for_each_irq(i) {
struct irq_desc *desc = irq_to_desc(i);
for_each_irq_desc(i, desc) {
struct irq_chip *chip;
if (!desc)
continue;
chip = irq_desc_get_chip(desc);
if (!chip)
continue;

8
arch/powerpc/platforms/cell/axon_msi.c
View File

@ -114,7 +114,7 @@ static void axon_msi_cascade(unsigned int irq, struct irq_desc *desc)
pr_devel("axon_msi: woff %x roff %x msi %x\n",
write_offset, msic->read_offset, msi);
if (msi < NR_IRQS && irq_get_chip_data(msi) == msic) {
if (msi < nr_irqs && irq_get_chip_data(msi) == msic) {
generic_handle_irq(msi);
msic->fifo_virt[idx] = cpu_to_le32(0xffffffff);
} else {
@ -276,9 +276,6 @@ static int axon_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
if (rc)
return rc;
/* We rely on being able to stash a virq in a u16 */
BUILD_BUG_ON(NR_IRQS > 65536);
list_for_each_entry(entry, &dev->msi_list, list) {
virq = irq_create_direct_mapping(msic->irq_domain);
if (virq == NO_IRQ) {
@ -392,7 +389,8 @@ static int axon_msi_probe(struct platform_device *device)
}
memset(msic->fifo_virt, 0xff, MSIC_FIFO_SIZE_BYTES);
msic->irq_domain = irq_domain_add_nomap(dn, 0, &msic_host_ops, msic);
/* We rely on being able to stash a virq in a u16, so limit irqs to < 65536 */
msic->irq_domain = irq_domain_add_nomap(dn, 65536, &msic_host_ops, msic);
if (!msic->irq_domain) {
printk(KERN_ERR "axon_msi: couldn't allocate irq_domain for %s\n",
dn->full_name);

2
arch/powerpc/platforms/cell/beat_interrupt.c
View File

@ -248,6 +248,6 @@ void beatic_deinit_IRQ(void)
{
int i;
for (i = 1; i < NR_IRQS; i++)
for (i = 1; i < nr_irqs; i++)
beat_destruct_irq_plug(i);
}

6
arch/powerpc/platforms/powermac/pic.c
View File

@ -57,9 +57,9 @@ static int max_real_irqs;
static DEFINE_RAW_SPINLOCK(pmac_pic_lock);
#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
static unsigned long ppc_lost_interrupts[NR_MASK_WORDS];
static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
/* The max irq number this driver deals with is 128; see max_irqs */
static DECLARE_BITMAP(ppc_lost_interrupts, 128);
static DECLARE_BITMAP(ppc_cached_irq_mask, 128);
static int pmac_irq_cascade = -1;
static struct irq_domain *pmac_pic_host;

3
arch/powerpc/sysdev/cpm2_pic.c
View File

@ -51,8 +51,7 @@
static intctl_cpm2_t __iomem *cpm2_intctl;
static struct irq_domain *cpm2_pic_host;
#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
static unsigned long ppc_cached_irq_mask[2]; /* 2 32-bit registers */
static const u_char irq_to_siureg[] = {
1, 1, 1, 1, 1, 1, 1, 1,

7
arch/powerpc/sysdev/xics/xics-common.c
View File

@ -188,6 +188,7 @@ void xics_migrate_irqs_away(void)
{
int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id();
unsigned int irq, virq;
struct irq_desc *desc;
/* If we used to be the default server, move to the new "boot_cpuid" */
if (hw_cpu == xics_default_server)
@ -202,8 +203,7 @@ void xics_migrate_irqs_away(void)
/* Allow IPIs again... */
icp_ops->set_priority(DEFAULT_PRIORITY);
for_each_irq(virq) {
struct irq_desc *desc;
for_each_irq_desc(virq, desc) {
struct irq_chip *chip;
long server;
unsigned long flags;
@ -212,9 +212,8 @@ void xics_migrate_irqs_away(void)
/* We can't set affinity on ISA interrupts */
if (virq < NUM_ISA_INTERRUPTS)
continue;
desc = irq_to_desc(virq);
/* We only need to migrate enabled IRQS */
if (!desc || !desc->action)
if (!desc->action)
continue;
if (desc->irq_data.domain != xics_host)
continue;