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MIPS: CM: Add cluster & block args to mips_cm_lock_other()

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With CM >= 3.5 we have the notion of multiple clusters & can access
their CM, CPC & GIC registers via the apporpriate redirect/other
register blocks. In order to allow for this introduce cluster & block
arguments to mips_cm_lock_other() which configures the redirect/other
region to point at the appropriate cluster, core, VP & register block.

Since we now have 4 arguments to mips_cm_lock_other() & a common use is
likely to be to target the cluster, core & VP corresponding to a
particular Linux CPU number we also add a new mips_cm_lock_other_cpu()
helper function which handles that without the caller needing to
manually pull out the cluster, core & VP numbers.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17013/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2017-08-12 19:49:39 -07:00
committed by Ralf Baechle
parent 5616897efd
commit 68923cdc2e
4 changed files with 58 additions and 18 deletions
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45
arch/mips/include/asm/mips-cm.h
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@@ -437,29 +437,56 @@ static inline unsigned int mips_cm_vp_id(unsigned int cpu)
#ifdef CONFIG_MIPS_CM
/**
* mips_cm_lock_other - lock access to another core
* mips_cm_lock_other - lock access to redirect/other region
* @cluster: the other cluster to be accessed
* @core: the other core to be accessed
* @vp: the VP within the other core to be accessed
* @block: the register block to be accessed
*
* Call before operating upon a core via the 'other' register region in
* order to prevent the region being moved during access. Must be followed
* by a call to mips_cm_unlock_other.
* Configure the redirect/other region for the local core/VP (depending upon
* the CM revision) to target the specified @cluster, @core, @vp & register
* @block. Must be called before using the redirect/other region, and followed
* by a call to mips_cm_unlock_other() when access to the redirect/other region
* is complete.
*
* This function acquires a spinlock such that code between it &
* mips_cm_unlock_other() calls cannot be pre-empted by anything which may
* reconfigure the redirect/other region, and cannot be interfered with by
* another VP in the core. As such calls to this function should not be nested.
*/
extern void mips_cm_lock_other(unsigned int core, unsigned int vp);
extern void mips_cm_lock_other(unsigned int cluster, unsigned int core,
unsigned int vp, unsigned int block);
/**
* mips_cm_unlock_other - unlock access to another core
* mips_cm_unlock_other - unlock access to redirect/other region
*
* Call after operating upon another core via the 'other' register region.
* Must be called after mips_cm_lock_other.
* Must be called after mips_cm_lock_other() once all required access to the
* redirect/other region has been completed.
*/
extern void mips_cm_unlock_other(void);
#else /* !CONFIG_MIPS_CM */
static inline void mips_cm_lock_other(unsigned int core, unsigned int vp) { }
static inline void mips_cm_lock_other(unsigned int cluster, unsigned int core,
unsigned int vp, unsigned int block) { }
static inline void mips_cm_unlock_other(void) { }
#endif /* !CONFIG_MIPS_CM */
/**
* mips_cm_lock_other_cpu - lock access to redirect/other region
* @cpu: the other CPU whose register we want to access
*
* Configure the redirect/other region for the local core/VP (depending upon
* the CM revision) to target the specified @cpu & register @block. This is
* equivalent to calling mips_cm_lock_other() but accepts a Linux CPU number
* for convenience.
*/
static inline void mips_cm_lock_other_cpu(unsigned int cpu, unsigned int block)
{
struct cpuinfo_mips *d = &cpu_data[cpu];
mips_cm_lock_other(cpu_cluster(d), cpu_core(d), cpu_vpe_id(d), block);
}
#endif /* __MIPS_ASM_MIPS_CM_H__ */