From cf8e8658100d4eae80ce9b21f7a81cb024dd5057 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Thu, 20 Oct 2022 15:54:33 +0200 Subject: arch: Remove Itanium (IA-64) architecture The Itanium architecture is obsolete, and an informal survey [0] reveals that any residual use of Itanium hardware in production is mostly HP-UX or OpenVMS based. The use of Linux on Itanium appears to be limited to enthusiasts that occasionally boot a fresh Linux kernel to see whether things are still working as intended, and perhaps to churn out some distro packages that are rarely used in practice. None of the original companies behind Itanium still produce or support any hardware or software for the architecture, and it is listed as 'Orphaned' in the MAINTAINERS file, as apparently, none of the engineers that contributed on behalf of those companies (nor anyone else, for that matter) have been willing to support or maintain the architecture upstream or even be responsible for applying the odd fix. The Intel firmware team removed all IA-64 support from the Tianocore/EDK2 reference implementation of EFI in 2018. (Itanium is the original architecture for which EFI was developed, and the way Linux supports it deviates significantly from other architectures.) Some distros, such as Debian and Gentoo, still maintain [unofficial] ia64 ports, but many have dropped support years ago. While the argument is being made [1] that there is a 'for the common good' angle to being able to build and run existing projects such as the Grid Community Toolkit [2] on Itanium for interoperability testing, the fact remains that none of those projects are known to be deployed on Linux/ia64, and very few people actually have access to such a system in the first place. Even if there were ways imaginable in which Linux/ia64 could be put to good use today, what matters is whether anyone is actually doing that, and this does not appear to be the case. There are no emulators widely available, and so boot testing Itanium is generally infeasible for ordinary contributors. GCC still supports IA-64 but its compile farm [3] no longer has any IA-64 machines. GLIBC would like to get rid of IA-64 [4] too because it would permit some overdue code cleanups. In summary, the benefits to the ecosystem of having IA-64 be part of it are mostly theoretical, whereas the maintenance overhead of keeping it supported is real. So let's rip off the band aid, and remove the IA-64 arch code entirely. This follows the timeline proposed by the Debian/ia64 maintainer [5], which removes support in a controlled manner, leaving IA-64 in a known good state in the most recent LTS release. Other projects will follow once the kernel support is removed. [0] https://lore.kernel.org/all/CAMj1kXFCMh_578jniKpUtx_j8ByHnt=s7S+yQ+vGbKt9ud7+kQ@mail.gmail.com/ [1] https://lore.kernel.org/all/0075883c-7c51-00f5-2c2d-5119c1820410@web.de/ [2] https://gridcf.org/gct-docs/latest/index.html [3] https://cfarm.tetaneutral.net/machines/list/ [4] https://lore.kernel.org/all/87bkiilpc4.fsf@mid.deneb.enyo.de/ [5] https://lore.kernel.org/all/ff58a3e76e5102c94bb5946d99187b358def688a.camel@physik.fu-berlin.de/ Acked-by: Tony Luck Signed-off-by: Ard Biesheuvel --- drivers/misc/sgi-gru/grufile.c | 72 ------------------------------------------ 1 file changed, 72 deletions(-) (limited to 'drivers/misc/sgi-gru/grufile.c') diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c index a3d659c11cc4..e755690c9805 100644 --- a/drivers/misc/sgi-gru/grufile.c +++ b/drivers/misc/sgi-gru/grufile.c @@ -337,72 +337,6 @@ static unsigned long gru_chiplet_cpu_to_mmr(int chiplet, int cpu, int *corep) return mmr; } -#ifdef CONFIG_IA64 - -static int gru_irq_count[GRU_CHIPLETS_PER_BLADE]; - -static void gru_noop(struct irq_data *d) -{ -} - -static struct irq_chip gru_chip[GRU_CHIPLETS_PER_BLADE] = { - [0 ... GRU_CHIPLETS_PER_BLADE - 1] { - .irq_mask = gru_noop, - .irq_unmask = gru_noop, - .irq_ack = gru_noop - } -}; - -static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, - irq_handler_t irq_handler, int cpu, int blade) -{ - unsigned long mmr; - int irq = IRQ_GRU + chiplet; - int ret, core; - - mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); - if (mmr == 0) - return 0; - - if (gru_irq_count[chiplet] == 0) { - gru_chip[chiplet].name = irq_name; - ret = irq_set_chip(irq, &gru_chip[chiplet]); - if (ret) { - printk(KERN_ERR "%s: set_irq_chip failed, errno=%d\n", - GRU_DRIVER_ID_STR, -ret); - return ret; - } - - ret = request_irq(irq, irq_handler, 0, irq_name, NULL); - if (ret) { - printk(KERN_ERR "%s: request_irq failed, errno=%d\n", - GRU_DRIVER_ID_STR, -ret); - return ret; - } - } - gru_irq_count[chiplet]++; - - return 0; -} - -static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) -{ - unsigned long mmr; - int core, irq = IRQ_GRU + chiplet; - - if (gru_irq_count[chiplet] == 0) - return; - - mmr = gru_chiplet_cpu_to_mmr(chiplet, cpu, &core); - if (mmr == 0) - return; - - if (--gru_irq_count[chiplet] == 0) - free_irq(irq, NULL); -} - -#elif defined CONFIG_X86_64 - static int gru_chiplet_setup_tlb_irq(int chiplet, char *irq_name, irq_handler_t irq_handler, int cpu, int blade) { @@ -447,8 +381,6 @@ static void gru_chiplet_teardown_tlb_irq(int chiplet, int cpu, int blade) } } -#endif - static void gru_teardown_tlb_irqs(void) { int blade; @@ -514,12 +446,8 @@ static int __init gru_init(void) if (!gru_supported()) return 0; -#if defined CONFIG_IA64 - gru_start_paddr = 0xd000000000UL; /* ZZZZZZZZZZZZZZZZZZZ fixme */ -#else gru_start_paddr = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG) & 0x7fffffffffffUL; -#endif gru_start_vaddr = __va(gru_start_paddr); gru_end_paddr = gru_start_paddr + GRU_MAX_BLADES * GRU_SIZE; printk(KERN_INFO "GRU space: 0x%lx - 0x%lx\n", -- cgit v1.2.3