sgi-gru: change GRU CCH commands from inline functions to outofline functions

Change the GRU instructions that manage contexts from inline functions to
out-of-line functions.  This simplifies adding statistics & error checking
to these functions.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 197 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/gruhandles.c b/drivers/misc/sgi-gru/gruhandles.c
new file mode 100644
index 000000000000..5b82e7def16d
--- /dev/null
+++ b/drivers/misc/sgi-gru/gruhandles.c
@@ -0,0 +1,197 @@
+/*
+ *              GRU KERNEL MCS INSTRUCTIONS
+ *
+ *  Copyright (c) 2008 Silicon Graphics, Inc.  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; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  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.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include "gru.h"
+#include "grulib.h"
+#include "grutables.h"
+
+/* 10 sec */
+#ifdef CONFIG_IA64
+#include <asm/processor.h>
+#define GRU_OPERATION_TIMEOUT	(((cycles_t) local_cpu_data->itc_freq)*10)
+#else
+#include <asm/tsc.h>
+#define GRU_OPERATION_TIMEOUT	((cycles_t) tsc_khz*10*1000)
+#endif
+
+/* Extract the status field from a kernel handle */
+#define GET_MSEG_HANDLE_STATUS(h)	(((*(unsigned long *)(h)) >> 16) & 3)
+
+static void start_instruction(void *h)
+{
+	unsigned long *w0 = h;
+
+	wmb();		/* setting CMD bit must be last */
+	*w0 = *w0 | 1;
+	gru_flush_cache(h);
+}
+
+static int wait_instruction_complete(void *h, enum mcs_op opc)
+{
+	int status;
+	cycles_t start_time = get_cycles();
+
+	while (1) {
+		cpu_relax();
+		status = GET_MSEG_HANDLE_STATUS(h);
+		if (status != CCHSTATUS_ACTIVE)
+			break;
+		if (GRU_OPERATION_TIMEOUT < (get_cycles() - start_time))
+			panic("GRU %p is malfunctioning\n", h);
+	}
+	return status;
+}
+
+#if defined CONFIG_IA64
+static void cch_allocate_set_asids(
+		  struct gru_context_configuration_handle *cch, int asidval)
+{
+	int i;
+
+	for (i = 0; i < 8; i++) {
+		cch->asid[i] = (asidval++);
+#if 0
+		/* ZZZ hugepages not supported yet */
+		if (i == RGN_HPAGE)
+			cch->sizeavail[i] = GRU_SIZEAVAIL(hpage_shift);
+		else
+#endif
+			cch->sizeavail[i] = GRU_SIZEAVAIL(PAGE_SHIFT);
+	}
+}
+#elif defined CONFIG_X86_64
+static void cch_allocate_set_asids(
+		  struct gru_context_configuration_handle *cch, int asidval)
+{
+	int i;
+
+	for (i = 0; i < 8; i++) {
+		cch->asid[i] = asidval++;
+		cch->sizeavail[i] = GRU_SIZEAVAIL(PAGE_SHIFT) |
+			GRU_SIZEAVAIL(21);
+	}
+}
+#endif
+
+int cch_allocate(struct gru_context_configuration_handle *cch,
+			       int asidval, unsigned long cbrmap,
+			       unsigned long dsrmap)
+{
+	cch_allocate_set_asids(cch, asidval);
+	cch->dsr_allocation_map = dsrmap;
+	cch->cbr_allocation_map = cbrmap;
+	cch->opc = CCHOP_ALLOCATE;
+	start_instruction(cch);
+	return wait_instruction_complete(cch, cchop_allocate);
+}
+
+int cch_start(struct gru_context_configuration_handle *cch)
+{
+	cch->opc = CCHOP_START;
+	start_instruction(cch);
+	return wait_instruction_complete(cch, cchop_start);
+}
+
+int cch_interrupt(struct gru_context_configuration_handle *cch)
+{
+	cch->opc = CCHOP_INTERRUPT;
+	start_instruction(cch);
+	return wait_instruction_complete(cch, cchop_interrupt);
+}
+
+int cch_deallocate(struct gru_context_configuration_handle *cch)
+{
+	cch->opc = CCHOP_DEALLOCATE;
+	start_instruction(cch);
+	return wait_instruction_complete(cch, cchop_deallocate);
+}
+
+int cch_interrupt_sync(struct gru_context_configuration_handle
+				     *cch)
+{
+	cch->opc = CCHOP_INTERRUPT_SYNC;
+	start_instruction(cch);
+	return wait_instruction_complete(cch, cchop_interrupt_sync);
+}
+
+int tgh_invalidate(struct gru_tlb_global_handle *tgh,
+				 unsigned long vaddr, unsigned long vaddrmask,
+				 int asid, int pagesize, int global, int n,
+				 unsigned short ctxbitmap)
+{
+	tgh->vaddr = vaddr;
+	tgh->asid = asid;
+	tgh->pagesize = pagesize;
+	tgh->n = n;
+	tgh->global = global;
+	tgh->vaddrmask = vaddrmask;
+	tgh->ctxbitmap = ctxbitmap;
+	tgh->opc = TGHOP_TLBINV;
+	start_instruction(tgh);
+	return wait_instruction_complete(tgh, tghop_invalidate);
+}
+
+void tfh_write_only(struct gru_tlb_fault_handle *tfh,
+				  unsigned long pfn, unsigned long vaddr,
+				  int asid, int dirty, int pagesize)
+{
+	tfh->fillasid = asid;
+	tfh->fillvaddr = vaddr;
+	tfh->pfn = pfn;
+	tfh->dirty = dirty;
+	tfh->pagesize = pagesize;
+	tfh->opc = TFHOP_WRITE_ONLY;
+	start_instruction(tfh);
+}
+
+void tfh_write_restart(struct gru_tlb_fault_handle *tfh,
+				     unsigned long paddr, int gaa,
+				     unsigned long vaddr, int asid, int dirty,
+				     int pagesize)
+{
+	tfh->fillasid = asid;
+	tfh->fillvaddr = vaddr;
+	tfh->pfn = paddr >> GRU_PADDR_SHIFT;
+	tfh->gaa = gaa;
+	tfh->dirty = dirty;
+	tfh->pagesize = pagesize;
+	tfh->opc = TFHOP_WRITE_RESTART;
+	start_instruction(tfh);
+}
+
+void tfh_restart(struct gru_tlb_fault_handle *tfh)
+{
+	tfh->opc = TFHOP_RESTART;
+	start_instruction(tfh);
+}
+
+void tfh_user_polling_mode(struct gru_tlb_fault_handle *tfh)
+{
+	tfh->opc = TFHOP_USER_POLLING_MODE;
+	start_instruction(tfh);
+}
+
+void tfh_exception(struct gru_tlb_fault_handle *tfh)
+{
+	tfh->opc = TFHOP_EXCEPTION;
+	start_instruction(tfh);
+}
+