Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pul removal of obsolete architecture ports from Arnd Bergmann:
 "This removes the entire architecture code for blackfin, cris, frv,
  m32r, metag, mn10300, score, and tile, including the associated device
  drivers.

  I have been working with the (former) maintainers for each one to
  ensure that my interpretation was right and the code is definitely
  unused in mainline kernels. Many had fond memories of working on the
  respective ports to start with and getting them included in upstream,
  but also saw no point in keeping the port alive without any users.

  In the end, it seems that while the eight architectures are extremely
  different, they all suffered the same fate: There was one company in
  charge of an SoC line, a CPU microarchitecture and a software
  ecosystem, which was more costly than licensing newer off-the-shelf
  CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
  seems that all the SoC product lines are still around, but have not
  used the custom CPU architectures for several years at this point. In
  contrast, CPU instruction sets that remain popular and have actively
  maintained kernel ports tend to all be used across multiple licensees.

  [ See the new nds32 port merged in the previous commit for the next
    generation of "one company in charge of an SoC line, a CPU
    microarchitecture and a software ecosystem"   - Linus ]

  The removal came out of a discussion that is now documented at
  https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
  marking any ports as deprecated but remove them all at once after I
  made sure that they are all unused. Some architectures (notably tile,
  mn10300, and blackfin) are still being shipped in products with old
  kernels, but those products will never be updated to newer kernel
  releases.

  After this series, we still have a few architectures without mainline
  gcc support:

   - unicore32 and hexagon both have very outdated gcc releases, but the
     maintainers promised to work on providing something newer. At least
     in case of hexagon, this will only be llvm, not gcc.

   - openrisc, risc-v and nds32 are still in the process of finishing
     their support or getting it added to mainline gcc in the first
     place. They all have patched gcc-7.3 ports that work to some
     degree, but complete upstream support won't happen before gcc-8.1.
     Csky posted their first kernel patch set last week, their situation
     will be similar

  [ Palmer Dabbelt points out that RISC-V support is in mainline gcc
    since gcc-7, although gcc-7.3.0 is the recommended minimum  - Linus ]"

This really says it all:

 2498 files changed, 95 insertions(+), 467668 deletions(-)

* tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
  MAINTAINERS: UNICORE32: Change email account
  staging: iio: remove iio-trig-bfin-timer driver
  tty: hvc: remove tile driver
  tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
  serial: remove tile uart driver
  serial: remove m32r_sio driver
  serial: remove blackfin drivers
  serial: remove cris/etrax uart drivers
  usb: Remove Blackfin references in USB support
  usb: isp1362: remove blackfin arch glue
  usb: musb: remove blackfin port
  usb: host: remove tilegx platform glue
  pwm: remove pwm-bfin driver
  i2c: remove bfin-twi driver
  spi: remove blackfin related host drivers
  watchdog: remove bfin_wdt driver
  can: remove bfin_can driver
  mmc: remove bfin_sdh driver
  input: misc: remove blackfin rotary driver
  input: keyboard: remove bf54x driver
  ...

1 files changed, 0 insertions, 167 deletions

diff --git a/arch/tile/lib/cacheflush.c b/arch/tile/lib/cacheflush.c
deleted file mode 100644
index c1ebc1065fc1..000000000000
--- a/arch/tile/lib/cacheflush.c
+++ /dev/null
@@ -1,167 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#include <linux/export.h>
-#include <asm/page.h>
-#include <asm/cacheflush.h>
-#include <arch/icache.h>
-#include <arch/spr_def.h>
-
-
-void __flush_icache_range(unsigned long start, unsigned long end)
-{
-	invalidate_icache((const void *)start, end - start, PAGE_SIZE);
-}
-
-
-/* Force a load instruction to issue. */
-static inline void force_load(char *p)
-{
-	*(volatile char *)p;
-}
-
-/*
- * Flush and invalidate a VA range that is homed remotely on a single
- * core (if "!hfh") or homed via hash-for-home (if "hfh"), waiting
- * until the memory controller holds the flushed values.
- */
-void __attribute__((optimize("omit-frame-pointer")))
-finv_buffer_remote(void *buffer, size_t size, int hfh)
-{
-	char *p, *base;
-	size_t step_size, load_count;
-
-	/*
-	 * On TILEPro the striping granularity is a fixed 8KB; on
-	 * TILE-Gx it is configurable, and we rely on the fact that
-	 * the hypervisor always configures maximum striping, so that
-	 * bits 9 and 10 of the PA are part of the stripe function, so
-	 * every 512 bytes we hit a striping boundary.
-	 *
-	 */
-#ifdef __tilegx__
-	const unsigned long STRIPE_WIDTH = 512;
-#else
-	const unsigned long STRIPE_WIDTH = 8192;
-#endif
-
-#ifdef __tilegx__
-	/*
-	 * On TILE-Gx, we must disable the dstream prefetcher before doing
-	 * a cache flush; otherwise, we could end up with data in the cache
-	 * that we don't want there.  Note that normally we'd do an mf
-	 * after the SPR write to disabling the prefetcher, but we do one
-	 * below, before any further loads, so there's no need to do it
-	 * here.
-	 */
-	uint_reg_t old_dstream_pf = __insn_mfspr(SPR_DSTREAM_PF);
-	__insn_mtspr(SPR_DSTREAM_PF, 0);
-#endif
-
-	/*
-	 * Flush and invalidate the buffer out of the local L1/L2
-	 * and request the home cache to flush and invalidate as well.
-	 */
-	__finv_buffer(buffer, size);
-
-	/*
-	 * Wait for the home cache to acknowledge that it has processed
-	 * all the flush-and-invalidate requests.  This does not mean
-	 * that the flushed data has reached the memory controller yet,
-	 * but it does mean the home cache is processing the flushes.
-	 */
-	__insn_mf();
-
-	/*
-	 * Issue a load to the last cache line, which can't complete
-	 * until all the previously-issued flushes to the same memory
-	 * controller have also completed.  If we weren't striping
-	 * memory, that one load would be sufficient, but since we may
-	 * be, we also need to back up to the last load issued to
-	 * another memory controller, which would be the point where
-	 * we crossed a "striping" boundary (the granularity of striping
-	 * across memory controllers).  Keep backing up and doing this
-	 * until we are before the beginning of the buffer, or have
-	 * hit all the controllers.
-	 *
-	 * If we are flushing a hash-for-home buffer, it's even worse.
-	 * Each line may be homed on a different tile, and each tile
-	 * may have up to four lines that are on different
-	 * controllers.  So as we walk backwards, we have to touch
-	 * enough cache lines to satisfy these constraints.  In
-	 * practice this ends up being close enough to "load from
-	 * every cache line on a full memory stripe on each
-	 * controller" that we simply do that, to simplify the logic.
-	 *
-	 * On TILE-Gx the hash-for-home function is much more complex,
-	 * with the upshot being we can't readily guarantee we have
-	 * hit both entries in the 128-entry AMT that were hit by any
-	 * load in the entire range, so we just re-load them all.
-	 * With larger buffers, we may want to consider using a hypervisor
-	 * trap to issue loads directly to each hash-for-home tile for
-	 * each controller (doing it from Linux would trash the TLB).
-	 */
-	if (hfh) {
-		step_size = L2_CACHE_BYTES;
-#ifdef __tilegx__
-		load_count = (size + L2_CACHE_BYTES - 1) / L2_CACHE_BYTES;
-#else
-		load_count = (STRIPE_WIDTH / L2_CACHE_BYTES) *
-			      (1 << CHIP_LOG_NUM_MSHIMS());
-#endif
-	} else {
-		step_size = STRIPE_WIDTH;
-		load_count = (1 << CHIP_LOG_NUM_MSHIMS());
-	}
-
-	/* Load the last byte of the buffer. */
-	p = (char *)buffer + size - 1;
-	force_load(p);
-
-	/* Bump down to the end of the previous stripe or cache line. */
-	p -= step_size;
-	p = (char *)((unsigned long)p | (step_size - 1));
-
-	/* Figure out how far back we need to go. */
-	base = p - (step_size * (load_count - 2));
-	if ((unsigned long)base < (unsigned long)buffer)
-		base = buffer;
-
-	/* Fire all the loads we need. */
-	for (; p >= base; p -= step_size)
-		force_load(p);
-
-	/*
-	 * Repeat, but with finv's instead of loads, to get rid of the
-	 * data we just loaded into our own cache and the old home L3.
-	 * The finv's are guaranteed not to actually flush the data in
-	 * the buffer back to their home, since we just read it, so the
-	 * lines are clean in cache; we will only invalidate those lines.
-	 */
-	p = (char *)buffer + size - 1;
-	__insn_finv(p);
-	p -= step_size;
-	p = (char *)((unsigned long)p | (step_size - 1));
-	for (; p >= base; p -= step_size)
-		__insn_finv(p);
-
-	/* Wait for these finv's (and thus the first finvs) to be done. */
-	__insn_mf();
-
-#ifdef __tilegx__
-	/* Reenable the prefetcher. */
-	__insn_mtspr(SPR_DSTREAM_PF, old_dstream_pf);
-#endif
-}
-EXPORT_SYMBOL_GPL(finv_buffer_remote);