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Diffstat (limited to 'drivers/misc/cxl/context.c')
-rw-r--r--drivers/misc/cxl/context.c193
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
new file mode 100644
index 000000000000..cca472109135
--- /dev/null
+++ b/drivers/misc/cxl/context.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright 2014 IBM Corp.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/bitmap.h>
+#include <linux/sched.h>
+#include <linux/pid.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/idr.h>
+#include <asm/cputable.h>
+#include <asm/current.h>
+#include <asm/copro.h>
+
+#include "cxl.h"
+
+/*
+ * Allocates space for a CXL context.
+ */
+struct cxl_context *cxl_context_alloc(void)
+{
+ return kzalloc(sizeof(struct cxl_context), GFP_KERNEL);
+}
+
+/*
+ * Initialises a CXL context.
+ */
+int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master)
+{
+ int i;
+
+ spin_lock_init(&ctx->sste_lock);
+ ctx->afu = afu;
+ ctx->master = master;
+ ctx->pid = NULL; /* Set in start work ioctl */
+
+ /*
+ * Allocate the segment table before we put it in the IDR so that we
+ * can always access it when dereferenced from IDR. For the same
+ * reason, the segment table is only destroyed after the context is
+ * removed from the IDR. Access to this in the IOCTL is protected by
+ * Linux filesytem symantics (can't IOCTL until open is complete).
+ */
+ i = cxl_alloc_sst(ctx);
+ if (i)
+ return i;
+
+ INIT_WORK(&ctx->fault_work, cxl_handle_fault);
+
+ init_waitqueue_head(&ctx->wq);
+ spin_lock_init(&ctx->lock);
+
+ ctx->irq_bitmap = NULL;
+ ctx->pending_irq = false;
+ ctx->pending_fault = false;
+ ctx->pending_afu_err = false;
+
+ /*
+ * When we have to destroy all contexts in cxl_context_detach_all() we
+ * end up with afu_release_irqs() called from inside a
+ * idr_for_each_entry(). Hence we need to make sure that anything
+ * dereferenced from this IDR is ok before we allocate the IDR here.
+ * This clears out the IRQ ranges to ensure this.
+ */
+ for (i = 0; i < CXL_IRQ_RANGES; i++)
+ ctx->irqs.range[i] = 0;
+
+ mutex_init(&ctx->status_mutex);
+
+ ctx->status = OPENED;
+
+ /*
+ * Allocating IDR! We better make sure everything's setup that
+ * dereferences from it.
+ */
+ idr_preload(GFP_KERNEL);
+ spin_lock(&afu->contexts_lock);
+ i = idr_alloc(&ctx->afu->contexts_idr, ctx, 0,
+ ctx->afu->num_procs, GFP_NOWAIT);
+ spin_unlock(&afu->contexts_lock);
+ idr_preload_end();
+ if (i < 0)
+ return i;
+
+ ctx->pe = i;
+ ctx->elem = &ctx->afu->spa[i];
+ ctx->pe_inserted = false;
+ return 0;
+}
+
+/*
+ * Map a per-context mmio space into the given vma.
+ */
+int cxl_context_iomap(struct cxl_context *ctx, struct vm_area_struct *vma)
+{
+ u64 len = vma->vm_end - vma->vm_start;
+ len = min(len, ctx->psn_size);
+
+ if (ctx->afu->current_mode == CXL_MODE_DEDICATED) {
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ return vm_iomap_memory(vma, ctx->afu->psn_phys, ctx->afu->adapter->ps_size);
+ }
+
+ /* make sure there is a valid per process space for this AFU */
+ if ((ctx->master && !ctx->afu->psa) || (!ctx->afu->pp_psa)) {
+ pr_devel("AFU doesn't support mmio space\n");
+ return -EINVAL;
+ }
+
+ /* Can't mmap until the AFU is enabled */
+ if (!ctx->afu->enabled)
+ return -EBUSY;
+
+ pr_devel("%s: mmio physical: %llx pe: %i master:%i\n", __func__,
+ ctx->psn_phys, ctx->pe , ctx->master);
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ return vm_iomap_memory(vma, ctx->psn_phys, len);
+}
+
+/*
+ * Detach a context from the hardware. This disables interrupts and doesn't
+ * return until all outstanding interrupts for this context have completed. The
+ * hardware should no longer access *ctx after this has returned.
+ */
+static void __detach_context(struct cxl_context *ctx)
+{
+ enum cxl_context_status status;
+
+ mutex_lock(&ctx->status_mutex);
+ status = ctx->status;
+ ctx->status = CLOSED;
+ mutex_unlock(&ctx->status_mutex);
+ if (status != STARTED)
+ return;
+
+ WARN_ON(cxl_detach_process(ctx));
+ afu_release_irqs(ctx);
+ flush_work(&ctx->fault_work); /* Only needed for dedicated process */
+ wake_up_all(&ctx->wq);
+}
+
+/*
+ * Detach the given context from the AFU. This doesn't actually
+ * free the context but it should stop the context running in hardware
+ * (ie. prevent this context from generating any further interrupts
+ * so that it can be freed).
+ */
+void cxl_context_detach(struct cxl_context *ctx)
+{
+ __detach_context(ctx);
+}
+
+/*
+ * Detach all contexts on the given AFU.
+ */
+void cxl_context_detach_all(struct cxl_afu *afu)
+{
+ struct cxl_context *ctx;
+ int tmp;
+
+ rcu_read_lock();
+ idr_for_each_entry(&afu->contexts_idr, ctx, tmp)
+ /*
+ * Anything done in here needs to be setup before the IDR is
+ * created and torn down after the IDR removed
+ */
+ __detach_context(ctx);
+ rcu_read_unlock();
+}
+
+void cxl_context_free(struct cxl_context *ctx)
+{
+ spin_lock(&ctx->afu->contexts_lock);
+ idr_remove(&ctx->afu->contexts_idr, ctx->pe);
+ spin_unlock(&ctx->afu->contexts_lock);
+ synchronize_rcu();
+
+ free_page((u64)ctx->sstp);
+ ctx->sstp = NULL;
+
+ put_pid(ctx->pid);
+ kfree(ctx);
+}