lwn.git/arch/powerpc/platforms/iseries/irq.c, branch v4.13-rc6

powerpc: Remove the main legacy iSerie platform code

2012-03-08T23:35:11+00:00

Signed-off-by: Stephen Rothwell Signed-off-by: Benjamin Herrenschmidt

powerpc: Consolidate ipi message mux and demux

2011-05-19T05:31:03+00:00

Consolidate the mux and demux of ipi messages into smp.c and call a new smp_ops callback to actually trigger the ipi. The powerpc architecture code is optimised for having 4 distinct ipi triggers, which are mapped to 4 distinct messages (ipi many, ipi single, scheduler ipi, and enter debugger). However, several interrupt controllers only provide a single software triggered interrupt that can be delivered to each cpu. To resolve this limitation, each smp_ops implementation created a per-cpu variable that is manipulated with atomic bitops. Since these lines will be contended they are optimialy marked as shared_aligned and take a full cache line for each cpu. Distro kernels may have 2 or 3 of these in their config, each taking per-cpu space even though at most one will be in use. This consolidation removes smp_message_recv and replaces the single call actions cases with direct calls from the common message recognition loop. The complicated debugger ipi case with its muxed crash handling code is moved to debug_ipi_action which is now called from the demux code (instead of the multi-message action calling smp_message_recv). I put a call to reschedule_action to increase the likelyhood of correctly merging the anticipated scheduler_ipi() hook coming from the scheduler tree; that single required call can be inlined later. The actual message decode is a copy of the old pseries xics code with its memory barriers and cache line spacing, augmented with a per-cpu unsigned long based on the book-e doorbell code. The optional data is set via a callback from the implementation and is passed to the new cause-ipi hook along with the logical cpu number. While currently only the doorbell implemntation uses this data it should be almost zero cost to retrieve and pass it -- it adds a single register load for the argument from the same cache line to which we just completed a store and the register is dead on return from the call. I extended the data element from unsigned int to unsigned long in case some other code wanted to associate a pointer. The doorbell check_self is replaced by a call to smp_muxed_ipi_resend, conditioned on the CPU_DBELL feature. The ifdef guard could be relaxed to CONFIG_SMP but I left it with BOOKE for now. Also, the doorbell interrupt vector for book-e was not calling irq_enter and irq_exit, which throws off cpu accounting and causes code to not realize it is running in interrupt context. Add the missing calls. Signed-off-by: Milton Miller Signed-off-by: Benjamin Herrenschmidt

powerpc/irq: Stop exporting irq_map

2011-05-04T05:02:15+00:00

First step in eliminating irq_map[] table entirely Signed-off-by: Benjamin Herrenschmidt

powerpc: Convert to new irq_* function names

2011-03-29T12:48:12+00:00

Scripted with coccinelle. Signed-off-by: Thomas Gleixner

powerpc: platforms/iseries irq_data conversion.

2011-03-10T00:03:59+00:00

Signed-off-by: Lennert Buytenhek Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove whitespace in irq chip name fields

2010-02-17T03:02:48+00:00

Now we use printf style alignment there is no need to manually space these fields. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

genirq: Convert irq_desc.lock to raw_spinlock

2009-12-14T22:55:33+00:00

Convert locks which cannot be sleeping locks in preempt-rt to raw_spinlocks. Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra Acked-by: Ingo Molnar

powerpc: Fixup last users of irq_chip->typename

2009-11-24T03:32:45+00:00

The typename member of struct irq_chip was kept for migration purposes and is obsolete since more than 2 years. Fix up the leftovers. Signed-off-by: Thomas Gleixner Cc: Benjamin Herrenschmidt Cc: linuxppc-dev@ozlabs.org Acked-by: Geoff Levand Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove get_irq_desc()

2009-10-30T06:20:55+00:00

get_irq_desc() is a powerpc-specific version of irq_to_desc(). That is reason enough to remove it, but it also doesn't know about sparse irq_desc support which irq_to_desc() does (when we enable it). Signed-off-by: Michael Ellerman Acked-by: Grant Likely Signed-off-by: Benjamin Herrenschmidt

powerpc/irq: Convert obsolete irq_desc_t to struct irq_desc

2009-03-11T06:11:34+00:00

Impact: cleanup Convert the last remaining users. Signed-off-by: Thomas Gleixner CC: Benjamin Herrenschmidt CC: linuxppc-dev@ozlabs.org Signed-off-by: Benjamin Herrenschmidt