1 files changed, 554 insertions, 0 deletions
diff --git a/drivers/accel/habanalabs/common/command_buffer.c b/drivers/accel/habanalabs/common/command_buffer.c
new file mode 100644
index 000000000000..3a0535ac28b1
--- /dev/null
+++ b/drivers/accel/habanalabs/common/command_buffer.c
@@ -0,0 +1,554 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2019 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ */
+
+#include <uapi/drm/habanalabs_accel.h>
+#include "habanalabs.h"
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#define CB_VA_POOL_SIZE		(4UL * SZ_1G)
+
+static int cb_map_mem(struct hl_ctx *ctx, struct hl_cb *cb)
+{
+	struct hl_device *hdev = ctx->hdev;
+	struct asic_fixed_properties *prop = &hdev->asic_prop;
+	u32 page_size = prop->pmmu.page_size;
+	int rc;
+
+	if (!hdev->supports_cb_mapping) {
+		dev_err_ratelimited(hdev->dev,
+				"Mapping a CB to the device's MMU is not supported\n");
+		return -EINVAL;
+	}
+
+	if (!hdev->mmu_enable) {
+		dev_err_ratelimited(hdev->dev,
+				"Cannot map CB because MMU is disabled\n");
+		return -EINVAL;
+	}
+
+	if (cb->is_mmu_mapped)
+		return 0;
+
+	cb->roundup_size = roundup(cb->size, page_size);
+
+	cb->virtual_addr = (u64) gen_pool_alloc(ctx->cb_va_pool, cb->roundup_size);
+	if (!cb->virtual_addr) {
+		dev_err(hdev->dev, "Failed to allocate device virtual address for CB\n");
+		return -ENOMEM;
+	}
+
+	mutex_lock(&hdev->mmu_lock);
+	rc = hl_mmu_map_contiguous(ctx, cb->virtual_addr, cb->bus_address, cb->roundup_size);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to map VA %#llx to CB\n", cb->virtual_addr);
+		goto err_va_umap;
+	}
+	rc = hl_mmu_invalidate_cache(hdev, false, MMU_OP_USERPTR | MMU_OP_SKIP_LOW_CACHE_INV);
+	mutex_unlock(&hdev->mmu_lock);
+
+	cb->is_mmu_mapped = true;
+	return rc;
+
+err_va_umap:
+	mutex_unlock(&hdev->mmu_lock);
+	gen_pool_free(ctx->cb_va_pool, cb->virtual_addr, cb->roundup_size);
+	return rc;
+}
+
+static void cb_unmap_mem(struct hl_ctx *ctx, struct hl_cb *cb)
+{
+	struct hl_device *hdev = ctx->hdev;
+
+	mutex_lock(&hdev->mmu_lock);
+	hl_mmu_unmap_contiguous(ctx, cb->virtual_addr, cb->roundup_size);
+	hl_mmu_invalidate_cache(hdev, true, MMU_OP_USERPTR);
+	mutex_unlock(&hdev->mmu_lock);
+
+	gen_pool_free(ctx->cb_va_pool, cb->virtual_addr, cb->roundup_size);
+}
+
+static void cb_fini(struct hl_device *hdev, struct hl_cb *cb)
+{
+	if (cb->is_internal)
+		gen_pool_free(hdev->internal_cb_pool,
+				(uintptr_t)cb->kernel_address, cb->size);
+	else
+		hl_asic_dma_free_coherent(hdev, cb->size, cb->kernel_address, cb->bus_address);
+
+	kfree(cb);
+}
+
+static void cb_do_release(struct hl_device *hdev, struct hl_cb *cb)
+{
+	if (cb->is_pool) {
+		atomic_set(&cb->is_handle_destroyed, 0);
+		spin_lock(&hdev->cb_pool_lock);
+		list_add(&cb->pool_list, &hdev->cb_pool);
+		spin_unlock(&hdev->cb_pool_lock);
+	} else {
+		cb_fini(hdev, cb);
+	}
+}
+
+static struct hl_cb *hl_cb_alloc(struct hl_device *hdev, u32 cb_size,
+					int ctx_id, bool internal_cb)
+{
+	struct hl_cb *cb = NULL;
+	u32 cb_offset;
+	void *p;
+
+	/*
+	 * We use of GFP_ATOMIC here because this function can be called from
+	 * the latency-sensitive code path for command submission. Due to H/W
+	 * limitations in some of the ASICs, the kernel must copy the user CB
+	 * that is designated for an external queue and actually enqueue
+	 * the kernel's copy. Hence, we must never sleep in this code section
+	 * and must use GFP_ATOMIC for all memory allocations.
+	 */
+	if (ctx_id == HL_KERNEL_ASID_ID && !hdev->disabled)
+		cb = kzalloc(sizeof(*cb), GFP_ATOMIC);
+
+	if (!cb)
+		cb = kzalloc(sizeof(*cb), GFP_KERNEL);
+
+	if (!cb)
+		return NULL;
+
+	if (internal_cb) {
+		p = (void *) gen_pool_alloc(hdev->internal_cb_pool, cb_size);
+		if (!p) {
+			kfree(cb);
+			return NULL;
+		}
+
+		cb_offset = p - hdev->internal_cb_pool_virt_addr;
+		cb->is_internal = true;
+		cb->bus_address =  hdev->internal_cb_va_base + cb_offset;
+	} else if (ctx_id == HL_KERNEL_ASID_ID) {
+		p = hl_asic_dma_alloc_coherent(hdev, cb_size, &cb->bus_address, GFP_ATOMIC);
+		if (!p)
+			p = hl_asic_dma_alloc_coherent(hdev, cb_size, &cb->bus_address, GFP_KERNEL);
+	} else {
+		p = hl_asic_dma_alloc_coherent(hdev, cb_size, &cb->bus_address,
+						GFP_USER | __GFP_ZERO);
+	}
+
+	if (!p) {
+		dev_err(hdev->dev,
+			"failed to allocate %d of dma memory for CB\n",
+			cb_size);
+		kfree(cb);
+		return NULL;
+	}
+
+	cb->kernel_address = p;
+	cb->size = cb_size;
+
+	return cb;
+}
+
+struct hl_cb_mmap_mem_alloc_args {
+	struct hl_device *hdev;
+	struct hl_ctx *ctx;
+	u32 cb_size;
+	bool internal_cb;
+	bool map_cb;
+};
+
+static void hl_cb_mmap_mem_release(struct hl_mmap_mem_buf *buf)
+{
+	struct hl_cb *cb = buf->private;
+
+	hl_debugfs_remove_cb(cb);
+
+	if (cb->is_mmu_mapped)
+		cb_unmap_mem(cb->ctx, cb);
+
+	hl_ctx_put(cb->ctx);
+
+	cb_do_release(cb->hdev, cb);
+}
+
+static int hl_cb_mmap_mem_alloc(struct hl_mmap_mem_buf *buf, gfp_t gfp, void *args)
+{
+	struct hl_cb_mmap_mem_alloc_args *cb_args = args;
+	struct hl_cb *cb;
+	int rc, ctx_id = cb_args->ctx->asid;
+	bool alloc_new_cb = true;
+
+	if (!cb_args->internal_cb) {
+		/* Minimum allocation must be PAGE SIZE */
+		if (cb_args->cb_size < PAGE_SIZE)
+			cb_args->cb_size = PAGE_SIZE;
+
+		if (ctx_id == HL_KERNEL_ASID_ID &&
+				cb_args->cb_size <= cb_args->hdev->asic_prop.cb_pool_cb_size) {
+
+			spin_lock(&cb_args->hdev->cb_pool_lock);
+			if (!list_empty(&cb_args->hdev->cb_pool)) {
+				cb = list_first_entry(&cb_args->hdev->cb_pool,
+						typeof(*cb), pool_list);
+				list_del(&cb->pool_list);
+				spin_unlock(&cb_args->hdev->cb_pool_lock);
+				alloc_new_cb = false;
+			} else {
+				spin_unlock(&cb_args->hdev->cb_pool_lock);
+				dev_dbg(cb_args->hdev->dev, "CB pool is empty\n");
+			}
+		}
+	}
+
+	if (alloc_new_cb) {
+		cb = hl_cb_alloc(cb_args->hdev, cb_args->cb_size, ctx_id, cb_args->internal_cb);
+		if (!cb)
+			return -ENOMEM;
+	}
+
+	cb->hdev = cb_args->hdev;
+	cb->ctx = cb_args->ctx;
+	cb->buf = buf;
+	cb->buf->mappable_size = cb->size;
+	cb->buf->private = cb;
+
+	hl_ctx_get(cb->ctx);
+
+	if (cb_args->map_cb) {
+		if (ctx_id == HL_KERNEL_ASID_ID) {
+			dev_err(cb_args->hdev->dev,
+				"CB mapping is not supported for kernel context\n");
+			rc = -EINVAL;
+			goto release_cb;
+		}
+
+		rc = cb_map_mem(cb_args->ctx, cb);
+		if (rc)
+			goto release_cb;
+	}
+
+	hl_debugfs_add_cb(cb);
+
+	return 0;
+
+release_cb:
+	hl_ctx_put(cb->ctx);
+	cb_do_release(cb_args->hdev, cb);
+
+	return rc;
+}
+
+static int hl_cb_mmap(struct hl_mmap_mem_buf *buf,
+				      struct vm_area_struct *vma, void *args)
+{
+	struct hl_cb *cb = buf->private;
+
+	return cb->hdev->asic_funcs->mmap(cb->hdev, vma, cb->kernel_address,
+					cb->bus_address, cb->size);
+}
+
+static struct hl_mmap_mem_buf_behavior cb_behavior = {
+	.topic = "CB",
+	.mem_id = HL_MMAP_TYPE_CB,
+	.alloc = hl_cb_mmap_mem_alloc,
+	.release = hl_cb_mmap_mem_release,
+	.mmap = hl_cb_mmap,
+};
+
+int hl_cb_create(struct hl_device *hdev, struct hl_mem_mgr *mmg,
+			struct hl_ctx *ctx, u32 cb_size, bool internal_cb,
+			bool map_cb, u64 *handle)
+{
+	struct hl_cb_mmap_mem_alloc_args args = {
+		.hdev = hdev,
+		.ctx = ctx,
+		.cb_size = cb_size,
+		.internal_cb = internal_cb,
+		.map_cb = map_cb,
+	};
+	struct hl_mmap_mem_buf *buf;
+	int ctx_id = ctx->asid;
+
+	if ((hdev->disabled) || (hdev->reset_info.in_reset && (ctx_id != HL_KERNEL_ASID_ID))) {
+		dev_warn_ratelimited(hdev->dev,
+			"Device is disabled or in reset. Can't create new CBs\n");
+		return -EBUSY;
+	}
+
+	if (cb_size > SZ_2M) {
+		dev_err(hdev->dev, "CB size %d must be less than %d\n",
+			cb_size, SZ_2M);
+		return -EINVAL;
+	}
+
+	buf = hl_mmap_mem_buf_alloc(
+		mmg, &cb_behavior,
+		ctx_id == HL_KERNEL_ASID_ID ? GFP_ATOMIC : GFP_KERNEL, &args);
+	if (!buf)
+		return -ENOMEM;
+
+	*handle = buf->handle;
+
+	return 0;
+}
+
+int hl_cb_destroy(struct hl_mem_mgr *mmg, u64 cb_handle)
+{
+	struct hl_cb *cb;
+	int rc;
+
+	cb = hl_cb_get(mmg, cb_handle);
+	if (!cb) {
+		dev_dbg(mmg->dev, "CB destroy failed, no CB was found for handle %#llx\n",
+			cb_handle);
+		return -EINVAL;
+	}
+
+	/* Make sure that CB handle isn't destroyed more than once */
+	rc = atomic_cmpxchg(&cb->is_handle_destroyed, 0, 1);
+	hl_cb_put(cb);
+	if (rc) {
+		dev_dbg(mmg->dev, "CB destroy failed, handle %#llx was already destroyed\n",
+			cb_handle);
+		return -EINVAL;
+	}
+
+	rc = hl_mmap_mem_buf_put_handle(mmg, cb_handle);
+	if (rc < 0)
+		return rc; /* Invalid handle */
+
+	if (rc == 0)
+		dev_dbg(mmg->dev, "CB 0x%llx is destroyed while still in use\n", cb_handle);
+
+	return 0;
+}
+
+static int hl_cb_info(struct hl_mem_mgr *mmg,
+			u64 handle, u32 flags, u32 *usage_cnt, u64 *device_va)
+{
+	struct hl_cb *cb;
+	int rc = 0;
+
+	cb = hl_cb_get(mmg, handle);
+	if (!cb) {
+		dev_err(mmg->dev,
+			"CB info failed, no match to handle 0x%llx\n", handle);
+		return -EINVAL;
+	}
+
+	if (flags & HL_CB_FLAGS_GET_DEVICE_VA) {
+		if (cb->is_mmu_mapped) {
+			*device_va = cb->virtual_addr;
+		} else {
+			dev_err(mmg->dev, "CB is not mapped to the device's MMU\n");
+			rc = -EINVAL;
+			goto out;
+		}
+	} else {
+		*usage_cnt = atomic_read(&cb->cs_cnt);
+	}
+
+out:
+	hl_cb_put(cb);
+	return rc;
+}
+
+int hl_cb_ioctl(struct hl_fpriv *hpriv, void *data)
+{
+	union hl_cb_args *args = data;
+	struct hl_device *hdev = hpriv->hdev;
+	u64 handle = 0, device_va = 0;
+	enum hl_device_status status;
+	u32 usage_cnt = 0;
+	int rc;
+
+	if (!hl_device_operational(hdev, &status)) {
+		dev_dbg_ratelimited(hdev->dev,
+			"Device is %s. Can't execute CB IOCTL\n",
+			hdev->status[status]);
+		return -EBUSY;
+	}
+
+	switch (args->in.op) {
+	case HL_CB_OP_CREATE:
+		if (args->in.cb_size > HL_MAX_CB_SIZE) {
+			dev_err(hdev->dev,
+				"User requested CB size %d must be less than %d\n",
+				args->in.cb_size, HL_MAX_CB_SIZE);
+			rc = -EINVAL;
+		} else {
+			rc = hl_cb_create(hdev, &hpriv->mem_mgr, hpriv->ctx,
+					args->in.cb_size, false,
+					!!(args->in.flags & HL_CB_FLAGS_MAP),
+					&handle);
+		}
+
+		memset(args, 0, sizeof(*args));
+		args->out.cb_handle = handle;
+		break;
+
+	case HL_CB_OP_DESTROY:
+		rc = hl_cb_destroy(&hpriv->mem_mgr,
+					args->in.cb_handle);
+		break;
+
+	case HL_CB_OP_INFO:
+		rc = hl_cb_info(&hpriv->mem_mgr, args->in.cb_handle,
+				args->in.flags,
+				&usage_cnt,
+				&device_va);
+		if (rc)
+			break;
+
+		memset(&args->out, 0, sizeof(args->out));
+
+		if (args->in.flags & HL_CB_FLAGS_GET_DEVICE_VA)
+			args->out.device_va = device_va;
+		else
+			args->out.usage_cnt = usage_cnt;
+		break;
+
+	default:
+		rc = -EINVAL;
+		break;
+	}
+
+	return rc;
+}
+
+struct hl_cb *hl_cb_get(struct hl_mem_mgr *mmg, u64 handle)
+{
+	struct hl_mmap_mem_buf *buf;
+
+	buf = hl_mmap_mem_buf_get(mmg, handle);
+	if (!buf)
+		return NULL;
+	return buf->private;
+
+}
+
+void hl_cb_put(struct hl_cb *cb)
+{
+	hl_mmap_mem_buf_put(cb->buf);
+}
+
+struct hl_cb *hl_cb_kernel_create(struct hl_device *hdev, u32 cb_size,
+					bool internal_cb)
+{
+	u64 cb_handle;
+	struct hl_cb *cb;
+	int rc;
+
+	rc = hl_cb_create(hdev, &hdev->kernel_mem_mgr, hdev->kernel_ctx, cb_size,
+				internal_cb, false, &cb_handle);
+	if (rc) {
+		dev_err(hdev->dev,
+			"Failed to allocate CB for the kernel driver %d\n", rc);
+		return NULL;
+	}
+
+	cb = hl_cb_get(&hdev->kernel_mem_mgr, cb_handle);
+	/* hl_cb_get should never fail here */
+	if (!cb) {
+		dev_crit(hdev->dev, "Kernel CB handle invalid 0x%x\n",
+				(u32) cb_handle);
+		goto destroy_cb;
+	}
+
+	return cb;
+
+destroy_cb:
+	hl_cb_destroy(&hdev->kernel_mem_mgr, cb_handle);
+
+	return NULL;
+}
+
+int hl_cb_pool_init(struct hl_device *hdev)
+{
+	struct hl_cb *cb;
+	int i;
+
+	INIT_LIST_HEAD(&hdev->cb_pool);
+	spin_lock_init(&hdev->cb_pool_lock);
+
+	for (i = 0 ; i < hdev->asic_prop.cb_pool_cb_cnt ; i++) {
+		cb = hl_cb_alloc(hdev, hdev->asic_prop.cb_pool_cb_size,
+				HL_KERNEL_ASID_ID, false);
+		if (cb) {
+			cb->is_pool = true;
+			list_add(&cb->pool_list, &hdev->cb_pool);
+		} else {
+			hl_cb_pool_fini(hdev);
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
+int hl_cb_pool_fini(struct hl_device *hdev)
+{
+	struct hl_cb *cb, *tmp;
+
+	list_for_each_entry_safe(cb, tmp, &hdev->cb_pool, pool_list) {
+		list_del(&cb->pool_list);
+		cb_fini(hdev, cb);
+	}
+
+	return 0;
+}
+
+int hl_cb_va_pool_init(struct hl_ctx *ctx)
+{
+	struct hl_device *hdev = ctx->hdev;
+	struct asic_fixed_properties *prop = &hdev->asic_prop;
+	int rc;
+
+	if (!hdev->supports_cb_mapping)
+		return 0;
+
+	ctx->cb_va_pool = gen_pool_create(__ffs(prop->pmmu.page_size), -1);
+	if (!ctx->cb_va_pool) {
+		dev_err(hdev->dev,
+			"Failed to create VA gen pool for CB mapping\n");
+		return -ENOMEM;
+	}
+
+	ctx->cb_va_pool_base = hl_reserve_va_block(hdev, ctx, HL_VA_RANGE_TYPE_HOST,
+					CB_VA_POOL_SIZE, HL_MMU_VA_ALIGNMENT_NOT_NEEDED);
+	if (!ctx->cb_va_pool_base) {
+		rc = -ENOMEM;
+		goto err_pool_destroy;
+	}
+	rc = gen_pool_add(ctx->cb_va_pool, ctx->cb_va_pool_base, CB_VA_POOL_SIZE, -1);
+	if (rc) {
+		dev_err(hdev->dev,
+			"Failed to add memory to VA gen pool for CB mapping\n");
+		goto err_unreserve_va_block;
+	}
+
+	return 0;
+
+err_unreserve_va_block:
+	hl_unreserve_va_block(hdev, ctx, ctx->cb_va_pool_base, CB_VA_POOL_SIZE);
+err_pool_destroy:
+	gen_pool_destroy(ctx->cb_va_pool);
+
+	return rc;
+}
+
+void hl_cb_va_pool_fini(struct hl_ctx *ctx)
+{
+	struct hl_device *hdev = ctx->hdev;
+
+	if (!hdev->supports_cb_mapping)
+		return;
+
+	gen_pool_destroy(ctx->cb_va_pool);
+	hl_unreserve_va_block(hdev, ctx, ctx->cb_va_pool_base, CB_VA_POOL_SIZE);
+}