On Tue, 19 Dec 2023 at 23:03, Sam Ravnborg via B4 Relay <devnull+sam.ravnborg.org@xxxxxxxxxx> wrote: > > This is the second attempt to sunset sun4m and sun4d. > See [1] for the inital attempt. > > The sun4m and sun4d parts of the kernel have seen no real interest > for several years now. Last time a few people surfaced, but it was > either due to a personal project or for nostalgic reasons. > It is time to let go and drop the parts of sparc32 that in reality > are not in use. > > LEON from Frontgrade Gaisler is the only real user of sparc32, > and this patchset reduces sparc32 to what is required by LEON. > > The defconfig is first adapted to the one used by Gaisler. > Then the patches removes sun4m and sun4d specific > implementations such as small drivers, SMP support, IRQ suppor etc. > > Removing sun4m and sun4d support allowed removal of the run time > patching of the code as well as a lot of assembler code. > The result is a much cleaner assembler code that is easier to > understand and thus maintain and extend. > > So far the code builds but it has seen no run-time testing. > > If anyone can tell me how to boot a linux kernel with the leon_genric > machine with QEMU that would be super as this would be a minimal > testing that others can reproduce as well. > I assume QEMU needs a few patches to make it work, but maybe I > just failed to use the right bootloader. > > TODO before this can be applied: > - Ack from davem - as he is the principal sparc maintainer > - Tested-by: preferably on a target or QEMU (see above) > I expect bugs as there are some involved changes! > > Ideas for the future > - Apply the most relevant downstream Gaisler patches > - The ones introducing CAS should have preference as we then > can drop the cmpxchg emulation > - Adjust defconfig to include all Gaisler drivers to make sure they > see build time coverage > - Move the leon bits from leon files to the general files > - Add leon smp support to smp_32.c > - Add leon irq support to irq_32.c > - Integrate leom_mm support with srmmu and drop some of the > function operations that are no longer needed > - The current sparc32 code assume the bootloader uses the prom > provided by sun. Maybe migrate over to a more modern device tree > way of working. > - Drop some of the homegrown memory allocators and use memblocks > > [1]: https://lore.kernel.org/all/20201218184347.2180772-1-sam@xxxxxxxxxxxx/ > > Sam > > --- > Sam Ravnborg (27): > sparc32: Update defconfig to LEON SMP > sparc32: Drop sun4m/sun4d support from head_32.S > sparc32: Drop floppy support > sparc32: Drop sun4m specific led driver > sparc32: Drop sun specific power management drivers > sparc32: Drop auxio support > sparc32: Drop run-time patching of ipi trap > sparc32: Drop patching of interrupt vector > sparc32: Drop sun4m/sun4d specific irq handling > sparc32: Drop sun4d/sun4m smp support > sparc32: Drop pcic support > sparc32: Drop mbus support > sparc32: Drop unused function __get_{phys,iospace} > sparc32: Drop unused mmu models > sparc32: Drop check for sparc_model > sparc32: Drop use of sparc_config > sparc32: Drop run-time patching of ASI instructions > sparc32: Drop support for 7 register windows > sparc32: Drop additional sun4d bits > sparc32: Drop unused prom ranges support > sparc32: Drop unused iommu support > sparc32: Drop sun4m irq support > sparc32: Drop unused trampoline code > sparc32: Drop config SPARC_LEON > sparc32: Drop sbus support > sbus: char: Drop now unused uctrl driver > fbdev/p9100: Drop now unused driver p9100 > > arch/sparc/Kconfig | 54 +-- > arch/sparc/configs/sparc32_defconfig | 170 +++---- > arch/sparc/include/asm/asmmacro.h | 22 - > arch/sparc/include/asm/auxio_32.h | 73 +-- > arch/sparc/include/asm/cpu_type.h | 18 - > arch/sparc/include/asm/elf_32.h | 2 - > arch/sparc/include/asm/fb.h | 8 +- > arch/sparc/include/asm/floppy.h | 2 - > arch/sparc/include/asm/floppy_32.h | 393 ---------------- > arch/sparc/include/asm/io-unit.h | 59 --- > arch/sparc/include/asm/io_32.h | 83 ---- > arch/sparc/include/asm/iommu.h | 2 - > arch/sparc/include/asm/iommu_32.h | 122 ----- > arch/sparc/include/asm/irq_32.h | 2 - > arch/sparc/include/asm/mbus.h | 97 ---- > arch/sparc/include/asm/mxcc.h | 138 ------ > arch/sparc/include/asm/obio.h | 226 --------- > arch/sparc/include/asm/oplib_32.h | 11 - > arch/sparc/include/asm/pcic.h | 130 ------ > arch/sparc/include/asm/pgtable_32.h | 24 - > arch/sparc/include/asm/pgtsrmmu.h | 33 +- > arch/sparc/include/asm/ross.h | 192 -------- > arch/sparc/include/asm/sbi.h | 116 ----- > arch/sparc/include/asm/sections.h | 3 - > arch/sparc/include/asm/swift.h | 107 ----- > arch/sparc/include/asm/switch_to_32.h | 1 - > arch/sparc/include/asm/timer_32.h | 1 + > arch/sparc/include/asm/tsunami.h | 65 --- > arch/sparc/include/asm/turbosparc.h | 126 ----- > arch/sparc/include/asm/viking.h | 255 ----------- > arch/sparc/include/asm/winmacro.h | 11 +- > arch/sparc/kernel/Makefile | 8 +- > arch/sparc/kernel/apc.c | 196 -------- > arch/sparc/kernel/auxio_32.c | 139 ------ > arch/sparc/kernel/cpu.c | 1 - > arch/sparc/kernel/devices.c | 10 +- > arch/sparc/kernel/entry.S | 413 +---------------- > arch/sparc/kernel/etrap_32.S | 50 +- > arch/sparc/kernel/head_32.S | 255 +---------- > arch/sparc/kernel/ioport.c | 55 +-- > arch/sparc/kernel/irq.h | 85 +--- > arch/sparc/kernel/irq_32.c | 133 +----- > arch/sparc/kernel/kernel.h | 53 +-- > arch/sparc/kernel/led.c | 146 ------ > arch/sparc/kernel/leon_kernel.c | 53 +-- > arch/sparc/kernel/leon_pmc.c | 16 +- > arch/sparc/kernel/leon_smp.c | 3 - > arch/sparc/kernel/of_device_32.c | 18 +- > arch/sparc/kernel/pcic.c | 840 ---------------------------------- > arch/sparc/kernel/pmc.c | 100 ---- > arch/sparc/kernel/process_32.c | 10 - > arch/sparc/kernel/rtrap_32.S | 73 ++- > arch/sparc/kernel/setup_32.c | 115 ----- > arch/sparc/kernel/smp_32.c | 102 +---- > arch/sparc/kernel/sun4d_irq.c | 519 --------------------- > arch/sparc/kernel/sun4d_smp.c | 415 ----------------- > arch/sparc/kernel/sun4m_irq.c | 478 ------------------- > arch/sparc/kernel/sun4m_smp.c | 275 ----------- > arch/sparc/kernel/time_32.c | 68 +-- > arch/sparc/kernel/trampoline_32.S | 127 +---- > arch/sparc/kernel/ttable_32.S | 9 +- > arch/sparc/kernel/vmlinux.lds.S | 5 - > arch/sparc/kernel/wof.S | 61 +-- > arch/sparc/kernel/wuf.S | 41 +- > arch/sparc/mm/Makefile | 4 +- > arch/sparc/mm/hypersparc.S | 414 ----------------- > arch/sparc/mm/io-unit.c | 286 ------------ > arch/sparc/mm/iommu.c | 455 ------------------ > arch/sparc/mm/mm_32.h | 4 - > arch/sparc/mm/srmmu.c | 836 +-------------------------------- > arch/sparc/mm/srmmu_access.S | 83 ---- > arch/sparc/mm/swift.S | 256 ----------- > arch/sparc/mm/tsunami.S | 132 ------ > arch/sparc/mm/viking.S | 284 ------------ > arch/sparc/prom/Makefile | 1 - > arch/sparc/prom/init_32.c | 2 - > arch/sparc/prom/misc_32.c | 2 - > arch/sparc/prom/ranges.c | 114 ----- > drivers/sbus/char/Kconfig | 8 - > drivers/sbus/char/Makefile | 1 - > drivers/sbus/char/uctrl.c | 435 ------------------ > drivers/usb/host/Kconfig | 2 +- > drivers/usb/host/ehci-hcd.c | 4 +- > drivers/usb/host/uhci-hcd.c | 2 +- > drivers/video/fbdev/Kconfig | 10 +- > drivers/video/fbdev/Makefile | 1 - > drivers/video/fbdev/p9100.c | 372 --------------- > sound/sparc/Kconfig | 1 + > 88 files changed, 318 insertions(+), 10809 deletions(-) > --- > base-commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8 > change-id: 20231219-sam-sparc32-sunset-v3-4751ea89da2d > > Best regards, > -- > Sam Ravnborg <sam@xxxxxxxxxxxx> > > Hi everyone, These changes will now effectively make the sparc32 port into a port that is only really supported by a rather specific sparc32 implementation delivered by Gaisler. I will therefore suggest to remove any remaining references to sparc32 and replaced them with leon, to symbolize the end of common sparc32 support. Best regards, Kjetil Oftedal
