kernel/linux.git/arch/powerpc/platforms/ps3/interrupt.c, branch linux-4.4.y

genirq/irqdomain: Allow irq domain aliasing

2015-07-29T22:14:36+00:00

It is not uncommon (at least with the ARM stuff) to have a piece of hardware that implements different flavours of "interrupts". A typical example of this is the GICv3 ITS, which implements standard PCI/MSI support, but also some form of "generic MSI". So far, the PCI/MSI domain is registered using the ITS device_node, so that irq_find_host can return it. On the contrary, the raw MSI domain is not registered with an device_node, making it impossible to be looked up by another subsystem (obviously, using the same device_node twice would only result in confusion, as it is not defined which one irq_find_host would return). A solution to this is to "type" domains that may be aliasing, and to be able to lookup an device_node that matches a given type. For this, we introduce irq_find_matching_host() as a superset of irq_find_host: struct irq_domain *irq_find_matching_host(struct device_node *node, enum irq_domain_bus_token bus_token); where bus_token is the "type" we want to match the domain against (so far, only DOMAIN_BUS_ANY is defined). This result in some moderately invasive changes on the PPC side (which is the only user of the .match method). This has otherwise no functionnal change. Reviewed-by: Hanjun Guo Signed-off-by: Marc Zyngier Cc: Cc: Yijing Wang Cc: Ma Jun Cc: Lorenzo Pieralisi Cc: Duc Dang Cc: Bjorn Helgaas Cc: Jiang Liu Cc: Jason Cooper Link: http://lkml.kernel.org/r/1438091186-10244-2-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner

powerpc: Replace __get_cpu_var uses

2014-11-03T01:12:32+00:00

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 CC: Paul Mackerras Signed-off-by: Christoph Lameter [mpe: Fix build errors caused by set/or_softirq_pending(), and rework assignment in __set_breakpoint() to use memcpy().] Signed-off-by: Michael Ellerman

irq_domain: Move irq_virq_count into NOMAP revmap

2012-04-12T06:37:48+00:00

This patch replaces the old global setting of irq_virq_count that is only used by the NOMAP mapping and instead uses a revmap_data property so that the maximum NOMAP allocation can be set per NOMAP irq_domain. There is exactly one user of irq_virq_count in-tree right now: PS3. Also, irq_virq_count is only useful for the NOMAP mapping. So, instead of having a single global irq_virq_count values, this change drops it entirely and added a max_irq argument to irq_domain_add_nomap(). That makes it a property of an individual nomap irq domain instead of a global system settting. Signed-off-by: Grant Likely Tested-by: Benjamin Herrenschmidt Cc: Thomas Gleixner Cc: Milton Miller

irq_domain/powerpc: constify irq_domain_ops

2012-02-16T13:11:24+00:00

Make all the irq_domain_ops structures in powerpc 'static const' Signed-off-by: Grant Likely Cc: Benjamin Herrenschmidt Cc: Thomas Gleixner Cc: Milton Miller Tested-by: Olof Johansson

irq_domain: Replace irq_alloc_host() with revmap-specific initializers

2012-02-16T13:11:22+00:00

Each revmap type has different arguments for setting up the revmap. This patch splits up the generator functions so that each revmap type can do its own setup and the user doesn't need to keep track of how each revmap type handles the arguments. This patch also adds a host_data argument to the generators. There are cases where the host_data pointer will be needed before the function returns. ie. the legacy map calls the .map callback for each irq before returning. v2: - Add void *host_data argument to irq_domain_add_*() functions - fixed failure to compile - Moved IRQ_DOMAIN_MAP_* defines into irqdomain.c Signed-off-by: Grant Likely Cc: Rob Herring Cc: Benjamin Herrenschmidt Cc: Thomas Gleixner Cc: Milton Miller Tested-by: Olof Johansson

irq_domain/powerpc: Use common irq_domain structure instead of irq_host

2012-02-14T21:06:50+00:00

This patch drops the powerpc-specific irq_host structures and uses the common irq_domain strucutres defined in linux/irqdomain.h. It also fixes all the users to use the new structure names. Renaming irq_host to irq_domain has been discussed for a long time, and this patch is a step in the process of generalizing the powerpc virq code to be usable by all architecture. An astute reader will notice that this patch actually removes the irq_host structure instead of renaming it. This is because the irq_domain structure already exists in include/linux/irqdomain.h and has the needed data members. Signed-off-by: Grant Likely Cc: Benjamin Herrenschmidt Cc: Thomas Gleixner Cc: Milton Miller Tested-by: Olof Johansson

powerpc/ps3: Interrupt code cleanup

2011-12-08T03:05:54+00:00

General code cleanup for PS3 interrupt.c: o Fill out comments for structure members. o Move variables ipi_debug_brk_mask and lock from struct ps3_bmp to struct ps3_private. o Fix pr_debug build errors when DEBUG is defined. o Convert bit operation to set_bit(). o Convert DBG macro from pr_debug to pr_devel o Add new macro FAIL to replace pr_debug calls Signed-off-by: Geoff Levand Signed-off-by: Benjamin Herrenschmidt

powerpc/ps3: Fix lost SMP IPIs

2011-11-16T03:47:54+00:00

Fixes the PS3 bootup hang introduced in 3.0-rc1 by: commit 317f394160e9beb97d19a84c39b7e5eb3d7815a sched: Move the second half of ttwu() to the remote cpu Move the PS3's LV1 EOI call lv1_end_of_interrupt_ext() from ps3_chip_eoi() to ps3_get_irq() for IPI messages. If lv1_send_event_locally() is called between a previous call to lv1_send_event_locally() and the coresponding call to lv1_end_of_interrupt_ext() the second event will not be delivered to the target cpu. The PS3's SMP IPIs are implemented using lv1_send_event_locally(), so if two IPI messages of the same type are sent to the same target in a relatively short period of time the second IPI event can become lost when lv1_end_of_interrupt_ext() is called from ps3_chip_eoi(). CC: stable@kernel.org Signed-off-by: Geoff Levand Signed-off-by: Benjamin Herrenschmidt

powerpc: various straight conversions from module.h --> export.h

2011-10-31T23:30:44+00:00

All these files were including module.h just for the basic EXPORT_SYMBOL infrastructure. We can shift them off to the export.h header which is a way smaller footprint and thus realize some compile time gains. Signed-off-by: Paul Gortmaker

powerpc: Remove trival irq_host_ops.unmap

2011-05-19T05:31:39+00:00

These all just clear chip or chipdata fields, which will be done by the generic code when we call irq_free_descs. Signed-off-by: Milton Miller Signed-off-by: Benjamin Herrenschmidt