kernel/git/stable/linux.git/arch/parisc/include, branch linux-5.18.y

parisc/stifb: Fix fb_is_primary_device() only available with CONFIG_FB_STI

2022-06-29T07:04:40+00:00

commit 1d0811b03eb30b2f0793acaa96c6ce90b8b9c87a upstream. Fix this build error noticed by the kernel test robot: drivers/video/console/sticore.c:1132:5: error: redefinition of 'fb_is_primary_device' arch/parisc/include/asm/fb.h:18:19: note: previous definition of 'fb_is_primary_device' Signed-off-by: Helge Deller Reported-by: kernel test robot Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Greg Kroah-Hartman

parisc/stifb: Implement fb_is_primary_device()

2022-06-09T08:29:26+00:00

commit cf936af790a3ef5f41ff687ec91bfbffee141278 upstream. Implement fb_is_primary_device() function, so that fbcon detects if this framebuffer belongs to the default graphics card which was used to start the system. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Greg Kroah-Hartman

parisc: define get_cycles macro for arch-override

2022-05-30T07:24:04+00:00

commit 8865bbe6ba1120e67f72201b7003a16202cd42be upstream. PA-RISC defines a get_cycles() function, but it does not do the usual `#define get_cycles get_cycles` dance, making it impossible for generic code to see if an arch-specific function was defined. While the get_cycles() ifdef is not currently used, the following timekeeping patch in this series will depend on the macro existing (or not existing) when defining random_get_entropy(). Cc: Thomas Gleixner Cc: Arnd Bergmann Acked-by: Helge Deller Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman

parisc: Rewrite cache flush code for PA8800/PA8900

2022-05-17T19:52:47+00:00

Originally, I was convinced that we needed to use tmpalias flushes everwhere, for both user and kernel flushes. However, when I modified flush_kernel_dcache_page_addr, to use a tmpalias flush, my c8000 would crash quite early when booting. The PDC returns alias values of 0 for the icache and dcache. This indicates that either the alias boundary is greater than 16MB or equivalent aliasing doesn't work. I modified the tmpalias code to make it easy to try alternate boundaries. I tried boundaries up to 128MB but still kernel tmpalias flushes didn't work on c8000. This led me to conclude that tmpalias flushes don't work on PA8800 and PA8900 machines, and that we needed to flush directly using the virtual address of user and kernel pages. This is likely the major cause of instability on the c8000 and rp34xx machines. Flushing user pages requires doing a temporary context switch as we have to flush pages that don't belong to the current context. Further, we have to deal with pages that aren't present. If a page isn't present, the flush instructions fault on every line. Other code has been rearranged and simplified based on testing. For example, I introduced a flush_cache_dup_mm routine. flush_cache_mm and flush_cache_dup_mm differ in that flush_cache_mm calls purge_cache_pages and flush_cache_dup_mm calls flush_cache_pages. In some implementations, pdc is more efficient than fdc. Based on my testing, I don't believe there's any performance benefit on the c8000. Signed-off-by: John David Anglin Signed-off-by: Helge Deller

parisc: Change MAX_ADDRESS to become unsigned long long

2022-05-08T18:01:11+00:00

Dave noticed that for the 32-bit kernel MAX_ADDRESS should be a ULL, otherwise this define would become 0: MAX_ADDRESS (1UL << MAX_ADDRBITS) It has no real effect on the kernel. Signed-off-by: Helge Deller Noticed-by: John David Anglin

parisc: Find a new timesync master if current CPU is removed

2022-03-29T19:37:13+00:00

When CPU hotplugging is enabled, the user may want to remove the current CPU which is providing the timer ticks. If this happens we need to find a new timesync master. Signed-off-by: Helge Deller

parisc: Implement __cpu_die() and __cpu_disable() for CPU hotplugging

2022-03-29T19:37:12+00:00

Add relevant code to __cpu_die() and __cpu_disable() to finally enable the CPU hotplugging features. Reset the irq count values in smp_callin() to zero before bringing up the CPU. It seems that the firmware may need up to 8 seconds to fully stop a CPU in which no other PDC calls are allowed to be made. Use a timeout __cpu_die() to accommodate for this. Use "chcpu -d 1" to bring CPU1 down, and "chcpu -e 1" to bring it up. Signed-off-by: Helge Deller

parisc: Add PDC locking functions for rendezvous code

2022-03-29T19:37:12+00:00

Add pdc_cpu_rendezvous_lock() and pdc_cpu_rendezvous_unlock() to lock PDC while CPU is transitioning into rendezvous state. This is needed, because the transition phase may take up to 8 seconds. Add pdc_pat_get_PDC_entrypoint() to get PDC entry point for current CPU. Signed-off-by: Helge Deller

parisc: Switch from GENERIC_CPU_DEVICES to GENERIC_ARCH_TOPOLOGY

2022-03-29T19:37:12+00:00

Switch away from the own cpu topology code to common code which is used by ARM64 and RISCV. That will allow us to enable CPU hotplug later on. Signed-off-by: Helge Deller

parisc: Add constants for control registers and clean up mfctl()

2022-03-29T19:37:12+00:00

Clean up the code for the mfctl() and mtctl() functions and add often used constants. Signed-off-by: Helge Deller