Merge branch 'omap-pool'

[linux-2.6-omap-h63xx.git] / drivers / misc / sgi-gru / gruhandles.c

diff --git a/drivers/misc/sgi-gru/gruhandles.c b/drivers/misc/sgi-gru/gruhandles.c
new file mode 100644 (file)
index 0000000..9b7ccb3
--- /dev/null
+++ b/drivers/misc/sgi-gru/gruhandles.c
@@ -0,0 +1,183 @@
+/*
+ *              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)
+
+struct mcs_op_statistic mcs_op_statistics[mcsop_last];
+
+static void update_mcs_stats(enum mcs_op op, unsigned long clks)
+{
+       atomic_long_inc(&mcs_op_statistics[op].count);
+       atomic_long_add(clks, &mcs_op_statistics[op].total);
+       if (mcs_op_statistics[op].max < clks)
+               mcs_op_statistics[op].max = clks;
+}
+
+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);
+       }
+       if (gru_options & OPT_STATS)
+               update_mcs_stats(opc, get_cycles() - start_time);
+       return status;
+}
+
+int cch_allocate(struct gru_context_configuration_handle *cch,
+               int asidval, int sizeavail, unsigned long cbrmap,
+               unsigned long dsrmap)
+{
+       int i;
+
+       for (i = 0; i < 8; i++) {
+               cch->asid[i] = (asidval++);
+               cch->sizeavail[i] = sizeavail;
+       }
+       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);
+}
+