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alpha/PCI: Move pci_map_irq()/pci_swizzle() out of initdata 

The introduction of {map/swizzle}_irq() hooks in the struct pci_host_bridge
allowed to replace the pci_fixup_irqs() PCI IRQ allocation in alpha arch
PCI code with per-bridge map/swizzle functions with commit 0e4c2eeb75
("alpha/PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping
hooks").

As a side effect of converting PCI IRQ allocation to the struct
pci_host_bridge {map/swizzle}_irq() hooks mechanism, the actual PCI IRQ
allocation function (ie pci_assign_irq()) is carried out per-device in
pci_device_probe() that is called when a PCI device driver is about to be
probed.

This means that, for drivers compiled as loadable modules, the actual PCI
device IRQ allocation can now happen after the system has booted so the
struct pci_host_bridge {map/swizzle}_irq() hooks pci_assign_irq() relies on
must stay valid after the system has booted so that PCI core can carry out
PCI IRQ allocation correctly.

Most of the alpha board structures pci_map_irq() and pci_swizzle() hooks
(that are used to initialize their struct pci_host_bridge equivalent
through the alpha_mv global variable - that represents the struct
alpha_machine_vector of the running kernel) are marked as
__init/__initdata; this causes freed memory dereferences when PCI IRQ
allocation is carried out after the kernel has booted (ie when loading PCI
drivers as loadable module) because when the kernel tries to bind the PCI
device to its (module) driver, the function pci_assign_irq() is called,
that in turn retrieves the struct pci_host_bridge {map/swizzle}_irq() hooks
to carry out PCI IRQ allocation; if those hooks are marked as __init
code/__initdata they point at freed/invalid memory.

Fix the issue by removing the __init/__initdata markers from all subarch
struct alpha_machine_vector.pci_map_irq()/pci_swizzle() functions (and
data).

Fixes: 0e4c2eeb75 ("alpha/PCI: Replace pci_fixup_irqs() call with host bridge IRQ mapping hooks")
Link: http://lkml.kernel.org/r/alpine.LRH.2.21.1710251043170.7098@math.ut.ee
Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Meelis Roos <mroos@linux.ee>
Cc: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Lorenzo Pieralisi 2017-10-26 15:54:15 +01:00 committed by Bjorn Helgaas
parent 407dae1e44
commit 814eae5982
17 changed files with 54 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/alpha/kernel/sys_alcor.c
View File

@ -181,10 +181,10 @@ alcor_init_irq(void)
* comes in on. This makes interrupt processing much easier.
*/
static int __init
static int
alcor_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[7][5] __initdata = {
static char irq_tab[7][5] = {
/*INT INTA INTB INTC INTD */
/* note: IDSEL 17 is XLT only */
{16+13, 16+13, 16+13, 16+13, 16+13}, /* IdSel 17, TULIP */

12
arch/alpha/kernel/sys_cabriolet.c
View File

@ -173,10 +173,10 @@ pc164_init_irq(void)
* because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
*/
static inline int __init
static inline int
eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[5][5] __initdata = {
static char irq_tab[5][5] = {
/*INT INTA INTB INTC INTD */
{16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J25 */
{16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J26 */
@ -203,10 +203,10 @@ eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
* because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
*/
static inline int __init
static inline int
cabriolet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[5][5] __initdata = {
static char irq_tab[5][5] = {
/*INT INTA INTB INTC INTD */
{ 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5, slot 2, J21 */
{ 16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J19 */
@ -287,10 +287,10 @@ cia_cab_init_pci(void)
*
*/
static inline int __init
static inline int
alphapc164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[7][5] __initdata = {
static char irq_tab[7][5] = {
/*INT INTA INTB INTC INTD */
{ 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */
{ 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */

20
arch/alpha/kernel/sys_dp264.c
View File

@ -356,7 +356,7 @@ clipper_init_irq(void)
* 10 64 bit PCI option slot 3 (not bus 0)
*/
static int __init
static int
isa_irq_fixup(const struct pci_dev *dev, int irq)
{
u8 irq8;
@ -372,10 +372,10 @@ isa_irq_fixup(const struct pci_dev *dev, int irq)
return irq8 & 0xf;
}
static int __init
static int
dp264_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[6][5] __initdata = {
static char irq_tab[6][5] = {
/*INT INTA INTB INTC INTD */
{ -1, -1, -1, -1, -1}, /* IdSel 5 ISA Bridge */
{ 16+ 3, 16+ 3, 16+ 2, 16+ 2, 16+ 2}, /* IdSel 6 SCSI builtin*/
@ -394,10 +394,10 @@ dp264_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return isa_irq_fixup(dev, irq);
}
static int __init
static int
monet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[13][5] __initdata = {
static char irq_tab[13][5] = {
/*INT INTA INTB INTC INTD */
{ 45, 45, 45, 45, 45}, /* IdSel 3 21143 PCI1 */
{ -1, -1, -1, -1, -1}, /* IdSel 4 unused */
@ -423,7 +423,7 @@ monet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);
}
static u8 __init
static u8
monet_swizzle(struct pci_dev *dev, u8 *pinp)
{
struct pci_controller *hose = dev->sysdata;
@ -456,10 +456,10 @@ monet_swizzle(struct pci_dev *dev, u8 *pinp)
return slot;
}
static int __init
static int
webbrick_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[13][5] __initdata = {
static char irq_tab[13][5] = {
/*INT INTA INTB INTC INTD */
{ -1, -1, -1, -1, -1}, /* IdSel 7 ISA Bridge */
{ -1, -1, -1, -1, -1}, /* IdSel 8 unused */
@ -478,10 +478,10 @@ webbrick_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);
}
static int __init
static int
clipper_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[7][5] __initdata = {
static char irq_tab[7][5] = {
/*INT INTA INTB INTC INTD */
{ 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 1 slot 1 */
{ 16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 2 slot 2 */

4
arch/alpha/kernel/sys_eb64p.c
View File

@ -167,10 +167,10 @@ eb64p_init_irq(void)
* comes in on. This makes interrupt processing much easier.
*/
static int __init
static int
eb64p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[5][5] __initdata = {
static char irq_tab[5][5] = {
/*INT INTA INTB INTC INTD */
{16+7, 16+7, 16+7, 16+7, 16+7}, /* IdSel 5, slot ?, ?? */
{16+0, 16+0, 16+2, 16+4, 16+9}, /* IdSel 6, slot ?, ?? */

4
arch/alpha/kernel/sys_eiger.c
View File

@ -141,7 +141,7 @@ eiger_init_irq(void)
}
}
static int __init
static int
eiger_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
u8 irq_orig;
@ -158,7 +158,7 @@ eiger_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return irq_orig - 0x80;
}
static u8 __init
static u8
eiger_swizzle(struct pci_dev *dev, u8 *pinp)
{
struct pci_controller *hose = dev->sysdata;

6
arch/alpha/kernel/sys_miata.c
View File

@ -149,10 +149,10 @@ miata_init_irq(void)
* comes in on. This makes interrupt processing much easier.
*/
static int __init
static int
miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[18][5] __initdata = {
static char irq_tab[18][5] = {
/*INT INTA INTB INTC INTD */
{16+ 8, 16+ 8, 16+ 8, 16+ 8, 16+ 8}, /* IdSel 14, DC21142 */
{ -1, -1, -1, -1, -1}, /* IdSel 15, EIDE */
@ -196,7 +196,7 @@ miata_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return COMMON_TABLE_LOOKUP;
}
static u8 __init
static u8
miata_swizzle(struct pci_dev *dev, u8 *pinp)
{
int slot, pin = *pinp;

4
arch/alpha/kernel/sys_mikasa.c
View File

@ -145,10 +145,10 @@ mikasa_init_irq(void)
* comes in on. This makes interrupt processing much easier.
*/
static int __init
static int
mikasa_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[8][5] __initdata = {
static char irq_tab[8][5] = {
/*INT INTA INTB INTC INTD */
{16+12, 16+12, 16+12, 16+12, 16+12}, /* IdSel 17, SCSI */
{ -1, -1, -1, -1, -1}, /* IdSel 18, PCEB */

2
arch/alpha/kernel/sys_nautilus.c
View File

@ -62,7 +62,7 @@ nautilus_init_irq(void)
common_init_isa_dma();
}
static int __init
static int
nautilus_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
/* Preserve the IRQ set up by the console. */

6
arch/alpha/kernel/sys_noritake.c
View File

@ -193,10 +193,10 @@ noritake_init_irq(void)
* comes in on. This makes interrupt processing much easier.
*/
static int __init
static int
noritake_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[15][5] __initdata = {
static char irq_tab[15][5] = {
/*INT INTA INTB INTC INTD */
/* note: IDSELs 16, 17, and 25 are CORELLE only */
{ 16+1, 16+1, 16+1, 16+1, 16+1}, /* IdSel 16, QLOGIC */
@ -221,7 +221,7 @@ noritake_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return COMMON_TABLE_LOOKUP;
}
static u8 __init
static u8
noritake_swizzle(struct pci_dev *dev, u8 *pinp)
{
int slot, pin = *pinp;

4
arch/alpha/kernel/sys_rawhide.c
View File

@ -221,10 +221,10 @@ rawhide_init_irq(void)
*
*/
static int __init
static int
rawhide_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[5][5] __initdata = {
static char irq_tab[5][5] = {
/*INT INTA INTB INTC INTD */
{ 16+16, 16+16, 16+16, 16+16, 16+16}, /* IdSel 1 SCSI PCI 1 */
{ 16+ 0, 16+ 0, 16+ 1, 16+ 2, 16+ 3}, /* IdSel 2 slot 2 */

6
arch/alpha/kernel/sys_ruffian.c
View File

@ -117,10 +117,10 @@ ruffian_kill_arch (int mode)
*
*/
static int __init
static int
ruffian_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[11][5] __initdata = {
static char irq_tab[11][5] = {
/*INT INTA INTB INTC INTD */
{-1, -1, -1, -1, -1}, /* IdSel 13, 21052 */
{-1, -1, -1, -1, -1}, /* IdSel 14, SIO */
@ -139,7 +139,7 @@ ruffian_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return COMMON_TABLE_LOOKUP;
}
static u8 __init
static u8
ruffian_swizzle(struct pci_dev *dev, u8 *pinp)
{
int slot, pin = *pinp;

4
arch/alpha/kernel/sys_rx164.c
View File

@ -142,7 +142,7 @@ rx164_init_irq(void)
*
*/
static int __init
static int
rx164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
#if 0
@ -156,7 +156,7 @@ rx164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{ 16+1, 16+1, 16+6, 16+11, 16+16}, /* IdSel 10, slot 4 */
};
#else
static char irq_tab[6][5] __initdata = {
static char irq_tab[6][5] = {
/*INT INTA INTB INTC INTD */
{ 16+0, 16+0, 16+6, 16+11, 16+16}, /* IdSel 5, slot 0 */
{ 16+1, 16+1, 16+7, 16+12, 16+17}, /* IdSel 6, slot 1 */

10
arch/alpha/kernel/sys_sable.c
View File

@ -192,10 +192,10 @@ sable_init_irq(void)
* with the values in the irq swizzling tables above.
*/
static int __init
static int
sable_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[9][5] __initdata = {
static char irq_tab[9][5] = {
/*INT INTA INTB INTC INTD */
{ 32+0, 32+0, 32+0, 32+0, 32+0}, /* IdSel 0, TULIP */
{ 32+1, 32+1, 32+1, 32+1, 32+1}, /* IdSel 1, SCSI */
@ -374,10 +374,10 @@ lynx_init_irq(void)
* with the values in the irq swizzling tables above.
*/
static int __init
static int
lynx_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[19][5] __initdata = {
static char irq_tab[19][5] = {
/*INT INTA INTB INTC INTD */
{ -1, -1, -1, -1, -1}, /* IdSel 13, PCEB */
{ -1, -1, -1, -1, -1}, /* IdSel 14, PPB */
@ -404,7 +404,7 @@ lynx_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return COMMON_TABLE_LOOKUP;
}
static u8 __init
static u8
lynx_swizzle(struct pci_dev *dev, u8 *pinp)
{
int slot, pin = *pinp;

8
arch/alpha/kernel/sys_sio.c
View File

@ -144,7 +144,7 @@ sio_fixup_irq_levels(unsigned int level_bits)
outb((level_bits >> 8) & 0xff, 0x4d1);
}
static inline int __init
static inline int
noname_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
/*
@ -165,7 +165,7 @@ noname_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
* that they use the default INTA line, if they are interrupt
* driven at all).
*/
static char irq_tab[][5] __initdata = {
static char irq_tab[][5] = {
/*INT A B C D */
{ 3, 3, 3, 3, 3}, /* idsel 6 (53c810) */
{-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */
@ -183,10 +183,10 @@ noname_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return irq >= 0 ? tmp : -1;
}
static inline int __init
static inline int
p2k_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[][5] __initdata = {
static char irq_tab[][5] = {
/*INT A B C D */
{ 0, 0, -1, -1, -1}, /* idsel 6 (53c810) */
{-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */

4
arch/alpha/kernel/sys_sx164.c
View File

@ -94,10 +94,10 @@ sx164_init_irq(void)
* 9 32 bit PCI option slot 3
*/
static int __init
static int
sx164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[5][5] __initdata = {
static char irq_tab[5][5] = {
/*INT INTA INTB INTC INTD */
{ 16+ 9, 16+ 9, 16+13, 16+17, 16+21}, /* IdSel 5 slot 2 J17 */
{ 16+11, 16+11, 16+15, 16+19, 16+23}, /* IdSel 6 slot 0 J19 */

6
arch/alpha/kernel/sys_takara.c
View File

@ -155,10 +155,10 @@ takara_init_irq(void)
* assign it whatever the hell IRQ we like and it doesn't matter.
*/
static int __init
static int
takara_map_irq_srm(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[15][5] __initdata = {
static char irq_tab[15][5] = {
{ 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */
{ 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */
{ 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */
@ -210,7 +210,7 @@ takara_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return COMMON_TABLE_LOOKUP;
}
static u8 __init
static u8
takara_swizzle(struct pci_dev *dev, u8 *pinp)
{
int slot = PCI_SLOT(dev->devfn);

4
arch/alpha/kernel/sys_wildfire.c
View File

@ -288,10 +288,10 @@ wildfire_device_interrupt(unsigned long vector)
* 7 64 bit PCI 1 option slot 7
*/
static int __init
static int
wildfire_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
static char irq_tab[8][5] __initdata = {
static char irq_tab[8][5] = {
/*INT INTA INTB INTC INTD */
{ -1, -1, -1, -1, -1}, /* IdSel 0 ISA Bridge */
{ 36, 36, 36+1, 36+2, 36+3}, /* IdSel 1 SCSI builtin */