habanalabs: unified memory manager new code for CB flow

This commit adds the new code needed for command buffer flow using the
new unified memory manager, without changing the actual functionality.

Signed-off-by: Yuri Nudelman <ynudelman@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 164 insertions, 0 deletions

diff --git a/drivers/misc/habanalabs/common/command_buffer.c b/drivers/misc/habanalabs/common/command_buffer.c
index a507110f6443..a2a97f4876bd 100644
--- a/drivers/misc/habanalabs/common/command_buffer.c
+++ b/drivers/misc/habanalabs/common/command_buffer.c
@@ -378,6 +378,162 @@ int hl_cb_destroy(struct hl_device *hdev, struct hl_cb_mgr *mgr, u64 cb_handle)
 	return rc;
 }
 
+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_args->hdev, 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_unified_mem_mgr(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 = {
+	.mem_id = HL_MMAP_TYPE_CB,
+	.alloc = hl_cb_mmap_mem_alloc,
+	.release = hl_cb_mmap_mem_release,
+	.mmap = hl_cb_mmap_unified_mem_mgr,
+};
+
+int hl_cb_create_unified_mem_mgr(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_unified_mem_mgr(struct hl_mem_mgr *mmg, u64 cb_handle)
+{
+	int rc;
+
+	rc = hl_mmap_mem_buf_put_handle(mmg, cb_handle);
+	if (rc < 0)
+		return rc; /* Invalid handle */
+
+	if (rc == 0)
+		dev_warn(mmg->dev, "CB 0x%llx is destroyed while still in use\n", cb_handle);
+
+	return 0;
+}
+
 static int hl_cb_info(struct hl_device *hdev, struct hl_cb_mgr *mgr,
 			u64 cb_handle, u32 flags, u32 *usage_cnt, u64 *device_va)
 {
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index cfe349ebd0bb..47a5baf652b7 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -796,6 +796,7 @@ struct hl_mmap_mem_buf {
  * @hdev: pointer to device this CB belongs to.
  * @ctx: pointer to the CB owner's context.
  * @lock: spinlock to protect mmap flows.
+ * @buf: back pointer to the parent mappable memory buffer
  * @debugfs_list: node in debugfs list of command buffers.
  * @pool_list: node in pool list of command buffers.
  * @va_block_list: list of virtual addresses blocks of the CB if it is mapped to
@@ -816,6 +817,7 @@ struct hl_cb {
 	struct hl_device	*hdev;
 	struct hl_ctx		*ctx;
 	spinlock_t		lock;
+	struct hl_mmap_mem_buf	*buf;
 	struct list_head	debugfs_list;
 	struct list_head	pool_list;
 	struct list_head	va_block_list;
@@ -2662,6 +2664,7 @@ struct hl_reset_info {
  * @cs_mirror_list: CS mirror list for TDR.
  * @cs_mirror_lock: protects cs_mirror_list.
  * @kernel_cb_mgr: command buffer manager for creating/destroying/handling CBs.
+ * @kernel_mem_mgr: memory manager for memory buffers with lifespan of driver.
  * @event_queue: event queue for IRQ from CPU-CP.
  * @dma_pool: DMA pool for small allocations.
  * @cpu_accessible_dma_mem: Host <-> CPU-CP shared memory CPU address.
@@ -2794,6 +2797,7 @@ struct hl_device {
 	struct list_head		cs_mirror_list;
 	spinlock_t			cs_mirror_lock;
 	struct hl_cb_mgr		kernel_cb_mgr;
+	struct hl_mem_mgr		kernel_mem_mgr;
 	struct hl_eq			event_queue;
 	struct dma_pool			*dma_pool;
 	void				*cpu_accessible_dma_mem;
@@ -3098,6 +3102,10 @@ void hl_sysfs_fini(struct hl_device *hdev);
 int hl_hwmon_init(struct hl_device *hdev);
 void hl_hwmon_fini(struct hl_device *hdev);
 
+int hl_cb_create_unified_mem_mgr(struct hl_device *hdev, struct hl_mem_mgr *mmg,
+			struct hl_ctx *ctx, u32 cb_size, bool internal_cb,
+			bool map_cb, u64 *handle);
+int hl_cb_destroy_unified_mem_mgr(struct hl_mem_mgr *mmg, u64 cb_handle);
 int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,
 			struct hl_ctx *ctx, u32 cb_size, bool internal_cb,
 			bool map_cb, u64 *handle);