mirror of
https://github.com/SCST-project/scst.git
synced 2026-08-18 21:26:31 +00:00
Bart Van Assche
13e22542d1
With a realtime kernel with full preemption (CONFIG_PREEMPT_RT_FULL), spinlocks can sleep, interrupt handlers run in thread context, and the standard local_irq functions manipulate preemptibility, not HW interruptibility. Under these conditions, most calls to local_irq functions should be replaced by no-ops. The CONFIG_PREEMPT_RT patch defines _nort versions of local_irq functions that compile away under CONFIG_PREEMPT_RT_FULL and compile to their "normal" equivalents otherwise. Define _nort equivalents to support compilation against both "normal" and RT-patched kernels, and use the _nort local_irq functons in cases where spinlocks are taken within a local_irq_save() or local_irq_disable() block. Without these changes, runtime warnings about "sleeping function called from invalid context" occur. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> [bvanassche: Edited patch description and comment in scst_priv.h] git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5288 d57e44dd-8a1f-0410-8b47-8ef2f437770f
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/*
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* QLogic Fibre Channel HBA Driver
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* Copyright (c) 2003-2008 QLogic Corporation
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*
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* See LICENSE.qla2xxx for copyright and licensing details.
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*/
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/*
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* qla2x00_debounce_register
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* Debounce register.
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*
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* Input:
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* port = register address.
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*
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* Returns:
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* register value.
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*/
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static __inline__ uint16_t
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qla2x00_debounce_register(volatile uint16_t __iomem *addr)
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{
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volatile uint16_t first;
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volatile uint16_t second;
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do {
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first = RD_REG_WORD(addr);
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barrier();
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cpu_relax();
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second = RD_REG_WORD(addr);
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} while (first != second);
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return (first);
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}
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static inline void
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qla2x00_poll(scsi_qla_host_t *ha)
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{
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unsigned long flags;
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#ifdef CONFIG_PREEMPT_RT_FULL
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local_irq_save_nort(flags);
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#else
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local_irq_save(flags);
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#endif
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ha->isp_ops->intr_handler(0, ha);
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#ifdef CONFIG_PREEMPT_RT_FULL
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local_irq_restore_nort(flags);
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#else
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local_irq_restore(flags);
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#endif
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}
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static __inline__ scsi_qla_host_t *
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to_qla_parent(scsi_qla_host_t *ha)
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{
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return ha->parent ? ha->parent : ha;
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}
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static inline uint8_t *
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host_to_fcp_swap(uint8_t *fcp, uint32_t bsize)
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{
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uint32_t *ifcp = (uint32_t *) fcp;
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uint32_t *ofcp = (uint32_t *) fcp;
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uint32_t iter = bsize >> 2;
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for (; iter ; iter--)
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*ofcp++ = swab32(*ifcp++);
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return fcp;
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}
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static inline int
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qla2x00_is_reserved_id(scsi_qla_host_t *ha, uint16_t loop_id)
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{
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if (IS_FWI2_CAPABLE(ha))
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return (loop_id > NPH_LAST_HANDLE);
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return ((loop_id > ha->last_loop_id && loop_id < SNS_FIRST_LOOP_ID) ||
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loop_id == MANAGEMENT_SERVER || loop_id == BROADCAST);
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};
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