mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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69111bac42
This still has not been merged and now powerpc is the only arch that does
not have this change. Sorry about missing linuxppc-dev before.
V2->V2
- Fix up to work against 3.18-rc1
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
[mpe: Fix build errors caused by set/or_softirq_pending(), and rework
assignment in __set_breakpoint() to use memcpy().]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
/*
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* Common definitions accross all variants of ICP and ICS interrupt
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* controllers.
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*/
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#ifndef _XICS_H
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#define _XICS_H
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#include <linux/interrupt.h>
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#define XICS_IPI 2
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#define XICS_IRQ_SPURIOUS 0
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/* Want a priority other than 0. Various HW issues require this. */
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#define DEFAULT_PRIORITY 5
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/*
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* Mark IPIs as higher priority so we can take them inside interrupts
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* FIXME: still true now?
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*/
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#define IPI_PRIORITY 4
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/* The least favored priority */
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#define LOWEST_PRIORITY 0xFF
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/* The number of priorities defined above */
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#define MAX_NUM_PRIORITIES 3
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/* Native ICP */
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#ifdef CONFIG_PPC_ICP_NATIVE
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extern int icp_native_init(void);
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extern void icp_native_flush_interrupt(void);
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#else
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static inline int icp_native_init(void) { return -ENODEV; }
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#endif
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/* PAPR ICP */
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#ifdef CONFIG_PPC_ICP_HV
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extern int icp_hv_init(void);
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#else
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static inline int icp_hv_init(void) { return -ENODEV; }
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#endif
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/* ICP ops */
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struct icp_ops {
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unsigned int (*get_irq)(void);
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void (*eoi)(struct irq_data *d);
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void (*set_priority)(unsigned char prio);
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void (*teardown_cpu)(void);
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void (*flush_ipi)(void);
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#ifdef CONFIG_SMP
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void (*cause_ipi)(int cpu, unsigned long data);
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irq_handler_t ipi_action;
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#endif
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};
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extern const struct icp_ops *icp_ops;
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/* Native ICS */
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extern int ics_native_init(void);
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/* RTAS ICS */
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#ifdef CONFIG_PPC_ICS_RTAS
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extern int ics_rtas_init(void);
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#else
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static inline int ics_rtas_init(void) { return -ENODEV; }
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#endif
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/* HAL ICS */
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#ifdef CONFIG_PPC_POWERNV
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extern int ics_opal_init(void);
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#else
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static inline int ics_opal_init(void) { return -ENODEV; }
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#endif
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/* ICS instance, hooked up to chip_data of an irq */
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struct ics {
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struct list_head link;
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int (*map)(struct ics *ics, unsigned int virq);
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void (*mask_unknown)(struct ics *ics, unsigned long vec);
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long (*get_server)(struct ics *ics, unsigned long vec);
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int (*host_match)(struct ics *ics, struct device_node *node);
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char data[];
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};
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/* Commons */
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extern unsigned int xics_default_server;
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extern unsigned int xics_default_distrib_server;
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extern unsigned int xics_interrupt_server_size;
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extern struct irq_domain *xics_host;
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struct xics_cppr {
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unsigned char stack[MAX_NUM_PRIORITIES];
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int index;
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};
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DECLARE_PER_CPU(struct xics_cppr, xics_cppr);
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static inline void xics_push_cppr(unsigned int vec)
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{
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struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
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if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1))
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return;
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if (vec == XICS_IPI)
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os_cppr->stack[++os_cppr->index] = IPI_PRIORITY;
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else
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os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY;
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}
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static inline unsigned char xics_pop_cppr(void)
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{
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struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
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if (WARN_ON(os_cppr->index < 1))
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return LOWEST_PRIORITY;
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return os_cppr->stack[--os_cppr->index];
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}
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static inline void xics_set_base_cppr(unsigned char cppr)
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{
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struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
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/* we only really want to set the priority when there's
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* just one cppr value on the stack
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*/
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WARN_ON(os_cppr->index != 0);
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os_cppr->stack[0] = cppr;
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}
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static inline unsigned char xics_cppr_top(void)
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{
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struct xics_cppr *os_cppr = this_cpu_ptr(&xics_cppr);
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return os_cppr->stack[os_cppr->index];
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}
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DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message);
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extern void xics_init(void);
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extern void xics_setup_cpu(void);
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extern void xics_update_irq_servers(void);
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extern void xics_set_cpu_giq(unsigned int gserver, unsigned int join);
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extern void xics_mask_unknown_vec(unsigned int vec);
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extern irqreturn_t xics_ipi_dispatch(int cpu);
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extern int xics_smp_probe(void);
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extern void xics_register_ics(struct ics *ics);
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extern void xics_teardown_cpu(void);
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extern void xics_kexec_teardown_cpu(int secondary);
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extern void xics_migrate_irqs_away(void);
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extern void icp_native_eoi(struct irq_data *d);
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#ifdef CONFIG_SMP
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extern int xics_get_irq_server(unsigned int virq, const struct cpumask *cpumask,
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unsigned int strict_check);
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#else
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#define xics_get_irq_server(virq, cpumask, strict_check) (xics_default_server)
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#endif
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#endif /* _XICS_H */
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