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linux_dsm_epyc7002/include/asm-powerpc/mpic.h
Stephen Rothwell 06a901c562 [POWERPC] mpic: Fix use of uninitialized variable 
Compiling ppc64_defconfig with gcc 4.3 gives thes warnings:

arch/powerpc/sysdev/mpic.c: In function 'mpic_irq_get_priority':
arch/powerpc/sysdev/mpic.c:1351: warning: 'is_ipi' may be used uninitialized in this function
arch/powerpc/sysdev/mpic.c: In function 'mpic_irq_set_priority':
arch/powerpc/sysdev/mpic.c:1328: warning: 'is_ipi' may be used uninitialized in this function

It turns out that in the cases where is_ipi is uninitialized, another
variable (mpic) will be NULL and it is dereferenced.  Protect against
this by returning if mpic is NULL in mpic_irq_set_priority, and removing
mpic_irq_get_priority completely as it has no in tree callers.

This has the nice side effect of making the warning go away.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-05-23 16:15:37 +10:00

480 lines
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#ifndef _ASM_POWERPC_MPIC_H
#define _ASM_POWERPC_MPIC_H
#ifdef __KERNEL__
#include <linux/irq.h>
#include <linux/sysdev.h>
#include <asm/dcr.h>
/*
* Global registers
*/
#define MPIC_GREG_BASE 0x01000
#define MPIC_GREG_FEATURE_0 0x00000
#define MPIC_GREG_FEATURE_LAST_SRC_MASK 0x07ff0000
#define MPIC_GREG_FEATURE_LAST_SRC_SHIFT 16
#define MPIC_GREG_FEATURE_LAST_CPU_MASK 0x00001f00
#define MPIC_GREG_FEATURE_LAST_CPU_SHIFT 8
#define MPIC_GREG_FEATURE_VERSION_MASK 0xff
#define MPIC_GREG_FEATURE_1 0x00010
#define MPIC_GREG_GLOBAL_CONF_0 0x00020
#define MPIC_GREG_GCONF_RESET 0x80000000
#define MPIC_GREG_GCONF_8259_PTHROU_DIS 0x20000000
#define MPIC_GREG_GCONF_NO_BIAS 0x10000000
#define MPIC_GREG_GCONF_BASE_MASK 0x000fffff
#define MPIC_GREG_GCONF_MCK 0x08000000
#define MPIC_GREG_GLOBAL_CONF_1 0x00030
#define MPIC_GREG_GLOBAL_CONF_1_SIE 0x08000000
#define MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK 0x70000000
#define MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(r) \
(((r) << 28) & MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK)
#define MPIC_GREG_VENDOR_0 0x00040
#define MPIC_GREG_VENDOR_1 0x00050
#define MPIC_GREG_VENDOR_2 0x00060
#define MPIC_GREG_VENDOR_3 0x00070
#define MPIC_GREG_VENDOR_ID 0x00080
#define MPIC_GREG_VENDOR_ID_STEPPING_MASK 0x00ff0000
#define MPIC_GREG_VENDOR_ID_STEPPING_SHIFT 16
#define MPIC_GREG_VENDOR_ID_DEVICE_ID_MASK 0x0000ff00
#define MPIC_GREG_VENDOR_ID_DEVICE_ID_SHIFT 8
#define MPIC_GREG_VENDOR_ID_VENDOR_ID_MASK 0x000000ff
#define MPIC_GREG_PROCESSOR_INIT 0x00090
#define MPIC_GREG_IPI_VECTOR_PRI_0 0x000a0
#define MPIC_GREG_IPI_VECTOR_PRI_1 0x000b0
#define MPIC_GREG_IPI_VECTOR_PRI_2 0x000c0
#define MPIC_GREG_IPI_VECTOR_PRI_3 0x000d0
#define MPIC_GREG_IPI_STRIDE 0x10
#define MPIC_GREG_SPURIOUS 0x000e0
#define MPIC_GREG_TIMER_FREQ 0x000f0
/*
*
* Timer registers
*/
#define MPIC_TIMER_BASE 0x01100
#define MPIC_TIMER_STRIDE 0x40
#define MPIC_TIMER_CURRENT_CNT 0x00000
#define MPIC_TIMER_BASE_CNT 0x00010
#define MPIC_TIMER_VECTOR_PRI 0x00020
#define MPIC_TIMER_DESTINATION 0x00030
/*
* Per-Processor registers
*/
#define MPIC_CPU_THISBASE 0x00000
#define MPIC_CPU_BASE 0x20000
#define MPIC_CPU_STRIDE 0x01000
#define MPIC_CPU_IPI_DISPATCH_0 0x00040
#define MPIC_CPU_IPI_DISPATCH_1 0x00050
#define MPIC_CPU_IPI_DISPATCH_2 0x00060
#define MPIC_CPU_IPI_DISPATCH_3 0x00070
#define MPIC_CPU_IPI_DISPATCH_STRIDE 0x00010
#define MPIC_CPU_CURRENT_TASK_PRI 0x00080
#define MPIC_CPU_TASKPRI_MASK 0x0000000f
#define MPIC_CPU_WHOAMI 0x00090
#define MPIC_CPU_WHOAMI_MASK 0x0000001f
#define MPIC_CPU_INTACK 0x000a0
#define MPIC_CPU_EOI 0x000b0
#define MPIC_CPU_MCACK 0x000c0
/*
* Per-source registers
*/
#define MPIC_IRQ_BASE 0x10000
#define MPIC_IRQ_STRIDE 0x00020
#define MPIC_IRQ_VECTOR_PRI 0x00000
#define MPIC_VECPRI_MASK 0x80000000
#define MPIC_VECPRI_ACTIVITY 0x40000000 /* Read Only */
#define MPIC_VECPRI_PRIORITY_MASK 0x000f0000
#define MPIC_VECPRI_PRIORITY_SHIFT 16
#define MPIC_VECPRI_VECTOR_MASK 0x000007ff
#define MPIC_VECPRI_POLARITY_POSITIVE 0x00800000
#define MPIC_VECPRI_POLARITY_NEGATIVE 0x00000000
#define MPIC_VECPRI_POLARITY_MASK 0x00800000
#define MPIC_VECPRI_SENSE_LEVEL 0x00400000
#define MPIC_VECPRI_SENSE_EDGE 0x00000000
#define MPIC_VECPRI_SENSE_MASK 0x00400000
#define MPIC_IRQ_DESTINATION 0x00010
#define MPIC_MAX_IRQ_SOURCES 2048
#define MPIC_MAX_CPUS 32
#define MPIC_MAX_ISU 32
/*
* Tsi108 implementation of MPIC has many differences from the original one
*/
/*
* Global registers
*/
#define TSI108_GREG_BASE 0x00000
#define TSI108_GREG_FEATURE_0 0x00000
#define TSI108_GREG_GLOBAL_CONF_0 0x00004
#define TSI108_GREG_VENDOR_ID 0x0000c
#define TSI108_GREG_IPI_VECTOR_PRI_0 0x00204 /* Doorbell 0 */
#define TSI108_GREG_IPI_STRIDE 0x0c
#define TSI108_GREG_SPURIOUS 0x00010
#define TSI108_GREG_TIMER_FREQ 0x00014
/*
* Timer registers
*/
#define TSI108_TIMER_BASE 0x0030
#define TSI108_TIMER_STRIDE 0x10
#define TSI108_TIMER_CURRENT_CNT 0x00000
#define TSI108_TIMER_BASE_CNT 0x00004
#define TSI108_TIMER_VECTOR_PRI 0x00008
#define TSI108_TIMER_DESTINATION 0x0000c
/*
* Per-Processor registers
*/
#define TSI108_CPU_BASE 0x00300
#define TSI108_CPU_STRIDE 0x00040
#define TSI108_CPU_IPI_DISPATCH_0 0x00200
#define TSI108_CPU_IPI_DISPATCH_STRIDE 0x00000
#define TSI108_CPU_CURRENT_TASK_PRI 0x00000
#define TSI108_CPU_WHOAMI 0xffffffff
#define TSI108_CPU_INTACK 0x00004
#define TSI108_CPU_EOI 0x00008
#define TSI108_CPU_MCACK 0x00004 /* Doesn't really exist here */
/*
* Per-source registers
*/
#define TSI108_IRQ_BASE 0x00100
#define TSI108_IRQ_STRIDE 0x00008
#define TSI108_IRQ_VECTOR_PRI 0x00000
#define TSI108_VECPRI_VECTOR_MASK 0x000000ff
#define TSI108_VECPRI_POLARITY_POSITIVE 0x01000000
#define TSI108_VECPRI_POLARITY_NEGATIVE 0x00000000
#define TSI108_VECPRI_SENSE_LEVEL 0x02000000
#define TSI108_VECPRI_SENSE_EDGE 0x00000000
#define TSI108_VECPRI_POLARITY_MASK 0x01000000
#define TSI108_VECPRI_SENSE_MASK 0x02000000
#define TSI108_IRQ_DESTINATION 0x00004
/* weird mpic register indices and mask bits in the HW info array */
enum {
MPIC_IDX_GREG_BASE = 0,
MPIC_IDX_GREG_FEATURE_0,
MPIC_IDX_GREG_GLOBAL_CONF_0,
MPIC_IDX_GREG_VENDOR_ID,
MPIC_IDX_GREG_IPI_VECTOR_PRI_0,
MPIC_IDX_GREG_IPI_STRIDE,
MPIC_IDX_GREG_SPURIOUS,
MPIC_IDX_GREG_TIMER_FREQ,
MPIC_IDX_TIMER_BASE,
MPIC_IDX_TIMER_STRIDE,
MPIC_IDX_TIMER_CURRENT_CNT,
MPIC_IDX_TIMER_BASE_CNT,
MPIC_IDX_TIMER_VECTOR_PRI,
MPIC_IDX_TIMER_DESTINATION,
MPIC_IDX_CPU_BASE,
MPIC_IDX_CPU_STRIDE,
MPIC_IDX_CPU_IPI_DISPATCH_0,
MPIC_IDX_CPU_IPI_DISPATCH_STRIDE,
MPIC_IDX_CPU_CURRENT_TASK_PRI,
MPIC_IDX_CPU_WHOAMI,
MPIC_IDX_CPU_INTACK,
MPIC_IDX_CPU_EOI,
MPIC_IDX_CPU_MCACK,
MPIC_IDX_IRQ_BASE,
MPIC_IDX_IRQ_STRIDE,
MPIC_IDX_IRQ_VECTOR_PRI,
MPIC_IDX_VECPRI_VECTOR_MASK,
MPIC_IDX_VECPRI_POLARITY_POSITIVE,
MPIC_IDX_VECPRI_POLARITY_NEGATIVE,
MPIC_IDX_VECPRI_SENSE_LEVEL,
MPIC_IDX_VECPRI_SENSE_EDGE,
MPIC_IDX_VECPRI_POLARITY_MASK,
MPIC_IDX_VECPRI_SENSE_MASK,
MPIC_IDX_IRQ_DESTINATION,
MPIC_IDX_END
};
#ifdef CONFIG_MPIC_U3_HT_IRQS
/* Fixup table entry */
struct mpic_irq_fixup
{
u8 __iomem *base;
u8 __iomem *applebase;
u32 data;
unsigned int index;
};
#endif /* CONFIG_MPIC_U3_HT_IRQS */
enum mpic_reg_type {
mpic_access_mmio_le,
mpic_access_mmio_be,
#ifdef CONFIG_PPC_DCR
mpic_access_dcr
#endif
};
struct mpic_reg_bank {
u32 __iomem *base;
#ifdef CONFIG_PPC_DCR
dcr_host_t dhost;
#endif /* CONFIG_PPC_DCR */
};
struct mpic_irq_save {
u32 vecprio,
dest;
#ifdef CONFIG_MPIC_U3_HT_IRQS
u32 fixup_data;
#endif
};
/* The instance data of a given MPIC */
struct mpic
{
/* The remapper for this MPIC */
struct irq_host *irqhost;
/* The "linux" controller struct */
struct irq_chip hc_irq;
#ifdef CONFIG_MPIC_U3_HT_IRQS
struct irq_chip hc_ht_irq;
#endif
#ifdef CONFIG_SMP
struct irq_chip hc_ipi;
#endif
const char *name;
/* Flags */
unsigned int flags;
/* How many irq sources in a given ISU */
unsigned int isu_size;
unsigned int isu_shift;
unsigned int isu_mask;
unsigned int irq_count;
/* Number of sources */
unsigned int num_sources;
/* Number of CPUs */
unsigned int num_cpus;
/* default senses array */
unsigned char *senses;
unsigned int senses_count;
/* vector numbers used for internal sources (ipi/timers) */
unsigned int ipi_vecs[4];
unsigned int timer_vecs[4];
/* Spurious vector to program into unused sources */
unsigned int spurious_vec;
#ifdef CONFIG_MPIC_U3_HT_IRQS
/* The fixup table */
struct mpic_irq_fixup *fixups;
spinlock_t fixup_lock;
#endif
/* Register access method */
enum mpic_reg_type reg_type;
/* The various ioremap'ed bases */
struct mpic_reg_bank gregs;
struct mpic_reg_bank tmregs;
struct mpic_reg_bank cpuregs[MPIC_MAX_CPUS];
struct mpic_reg_bank isus[MPIC_MAX_ISU];
/* Protected sources */
unsigned long *protected;
#ifdef CONFIG_MPIC_WEIRD
/* Pointer to HW info array */
u32 *hw_set;
#endif
#ifdef CONFIG_PCI_MSI
spinlock_t bitmap_lock;
unsigned long *hwirq_bitmap;
#endif
#ifdef CONFIG_MPIC_BROKEN_REGREAD
u32 isu_reg0_shadow[MPIC_MAX_IRQ_SOURCES];
#endif
/* link */
struct mpic *next;
struct sys_device sysdev;
#ifdef CONFIG_PM
struct mpic_irq_save *save_data;
#endif
};
/*
* MPIC flags (passed to mpic_alloc)
*
* The top 4 bits contain an MPIC bhw id that is used to index the
* register offsets and some masks when CONFIG_MPIC_WEIRD is set.
* Note setting any ID (leaving those bits to 0) means standard MPIC
*/
/* This is the primary controller, only that one has IPIs and
* has afinity control. A non-primary MPIC always uses CPU0
* registers only
*/
#define MPIC_PRIMARY 0x00000001
/* Set this for a big-endian MPIC */
#define MPIC_BIG_ENDIAN 0x00000002
/* Broken U3 MPIC */
#define MPIC_U3_HT_IRQS 0x00000004
/* Broken IPI registers (autodetected) */
#define MPIC_BROKEN_IPI 0x00000008
/* MPIC wants a reset */
#define MPIC_WANTS_RESET 0x00000010
/* Spurious vector requires EOI */
#define MPIC_SPV_EOI 0x00000020
/* No passthrough disable */
#define MPIC_NO_PTHROU_DIS 0x00000040
/* DCR based MPIC */
#define MPIC_USES_DCR 0x00000080
/* MPIC has 11-bit vector fields (or larger) */
#define MPIC_LARGE_VECTORS 0x00000100
/* Enable delivery of prio 15 interrupts as MCK instead of EE */
#define MPIC_ENABLE_MCK 0x00000200
/* Disable bias among target selection, spread interrupts evenly */
#define MPIC_NO_BIAS 0x00000400
/* MPIC HW modification ID */
#define MPIC_REGSET_MASK 0xf0000000
#define MPIC_REGSET(val) (((val) & 0xf ) << 28)
#define MPIC_GET_REGSET(flags) (((flags) >> 28) & 0xf)
#define MPIC_REGSET_STANDARD MPIC_REGSET(0) /* Original MPIC */
#define MPIC_REGSET_TSI108 MPIC_REGSET(1) /* Tsi108/109 PIC */
/* Allocate the controller structure and setup the linux irq descs
* for the range if interrupts passed in. No HW initialization is
* actually performed.
*
* @phys_addr: physial base address of the MPIC
* @flags: flags, see constants above
* @isu_size: number of interrupts in an ISU. Use 0 to use a
* standard ISU-less setup (aka powermac)
* @irq_offset: first irq number to assign to this mpic
* @irq_count: number of irqs to use with this mpic IRQ sources. Pass 0
* to match the number of sources
* @ipi_offset: first irq number to assign to this mpic IPI sources,
* used only on primary mpic
* @senses: array of sense values
* @senses_num: number of entries in the array
*
* Note about the sense array. If none is passed, all interrupts are
* setup to be level negative unless MPIC_U3_HT_IRQS is set in which
* case they are edge positive (and the array is ignored anyway).
* The values in the array start at the first source of the MPIC,
* that is senses[0] correspond to linux irq "irq_offset".
*/
extern struct mpic *mpic_alloc(struct device_node *node,
phys_addr_t phys_addr,
unsigned int flags,
unsigned int isu_size,
unsigned int irq_count,
const char *name);
/* Assign ISUs, to call before mpic_init()
*
* @mpic: controller structure as returned by mpic_alloc()
* @isu_num: ISU number
* @phys_addr: physical address of the ISU
*/
extern void mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
phys_addr_t phys_addr);
/* Set default sense codes
*
* @mpic: controller
* @senses: array of sense codes
* @count: size of above array
*
* Optionally provide an array (indexed on hardware interrupt numbers
* for this MPIC) of default sense codes for the chip. Those are linux
* sense codes IRQ_TYPE_*
*
* The driver gets ownership of the pointer, don't dispose of it or
* anything like that. __init only.
*/
extern void mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count);
/* Initialize the controller. After this has been called, none of the above
* should be called again for this mpic
*/
extern void mpic_init(struct mpic *mpic);
/*
* All of the following functions must only be used after the
* ISUs have been assigned and the controller fully initialized
* with mpic_init()
*/
/* Change the priority of an interrupt. Default is 8 for irqs and
* 10 for IPIs. You can call this on both IPIs and IRQ numbers, but the
* IPI number is then the offset'ed (linux irq number mapped to the IPI)
*/
extern void mpic_irq_set_priority(unsigned int irq, unsigned int pri);
/* Setup a non-boot CPU */
extern void mpic_setup_this_cpu(void);
/* Clean up for kexec (or cpu offline or ...) */
extern void mpic_teardown_this_cpu(int secondary);
/* Get the current cpu priority for this cpu (0..15) */
extern int mpic_cpu_get_priority(void);
/* Set the current cpu priority for this cpu */
extern void mpic_cpu_set_priority(int prio);
/* Request IPIs on primary mpic */
extern void mpic_request_ipis(void);
/* Send an IPI (non offseted number 0..3) */
extern void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask);
/* Send a message (IPI) to a given target (cpu number or MSG_*) */
void smp_mpic_message_pass(int target, int msg);
/* Unmask a specific virq */
extern void mpic_unmask_irq(unsigned int irq);
/* Mask a specific virq */
extern void mpic_mask_irq(unsigned int irq);
/* EOI a specific virq */
extern void mpic_end_irq(unsigned int irq);
/* Fetch interrupt from a given mpic */
extern unsigned int mpic_get_one_irq(struct mpic *mpic);
/* This one gets from the primary mpic */
extern unsigned int mpic_get_irq(void);
/* Fetch Machine Check interrupt from primary mpic */
extern unsigned int mpic_get_mcirq(void);
/* Set the EPIC clock ratio */
void mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio);
/* Enable/Disable EPIC serial interrupt mode */
void mpic_set_serial_int(struct mpic *mpic, int enable);
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_MPIC_H */
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