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Commit 224085b0 authored by Tharun Kumar Merugu's avatar Tharun Kumar Merugu
Browse files

msm: ADSPRPC: Share context bank with multiple sids 



Allow multiple stream ids to share the same context bank if
shared-sid property is defined for that contex bank.

Change-Id: I787fa3cc154e1407dd9068b466783827d2c0669d
Acked-by: default avatarVishnu Karthik D <vikarthi@qti.qualcomm.com>
Signed-off-by: default avatarTharun Kumar Merugu <mtharu@codeaurora.org>
parent 12165278

Documentation/devicetree/bindings/qdsp/msm-fastrpc.txt

+9 −0
Original line number Diff line number Diff line
@@ -32,6 +32,8 @@ Subnode Required properties: 
- dma-coherent :  A flag marking a context bank as I/O coherent

- shared-cb    :  A value indicating how many fastrpc sessions can share a

			context bank

- shared-sid   :  A value indicating the number of sids that are using the same

			context bank



Example:

	qcom,msm_fastrpc {
@@ -59,6 +61,13 @@ Example: 
			iommus = <&apps_smmu 0x1402 0x0>;

			shared-cb = <5>;

		};

		qcom,msm_fastrpc_compute_cb_3 {

			compatible = "qcom,msm-fastrpc-compute-cb";

			label = "adsprpc-smd";

			iommus = <&apps_smmu 0x0043 0x0>,

				 <&apps_smmu 0x0044 0x0>;

			shared-sid = <2>;

		};

	};



Legacy SMMU v1/v2:

drivers/char/adsprpc.c

+27 −0
Original line number Diff line number Diff line
@@ -3532,6 +3532,7 @@ static int fastrpc_cb_probe(struct device *dev) 
	dma_addr_t start = 0x80000000;

	int err = 0;

	unsigned int sharedcb_count = 0, cid, i, j;

	unsigned int index, num_indices = 0;

	int secure_vmid = VMID_CP_PIXEL, cache_flush = 1;



	VERIFY(err, NULL != (name = of_get_property(dev->of_node,
@@ -3624,6 +3625,32 @@ static int fastrpc_cb_probe(struct device *dev) 
	dma_set_max_seg_size(sess->smmu.dev, DMA_BIT_MASK(32));

	dma_set_seg_boundary(sess->smmu.dev, (unsigned long)DMA_BIT_MASK(64));



	if (of_get_property(dev->of_node, "shared-sid", NULL) != NULL) {

		struct fastrpc_session_ctx *new_sess;



		err = of_property_read_u32(dev->of_node, "shared-sid",

				&num_indices);

		if (err)

			goto bail;



		for (index = 1; index < num_indices &&

				chan->sesscount < NUM_SESSIONS; index++) {

			err = of_parse_phandle_with_args(dev->of_node, "iommus",

					"#iommu-cells", index, &iommuspec);

			if (err) {

				pr_err("adsprpc: %s: parsing iommu arguments failed for %s with err %d",

						__func__, dev_name(dev), err);

				goto bail;

			}

			chan->sesscount++;

			new_sess = &chan->session[chan->sesscount];

			memcpy(new_sess, sess,

				sizeof(struct fastrpc_session_ctx));

			new_sess->smmu.cb = iommuspec.args[0] & 0xf;

			sess = new_sess;

		}

	}



	if (of_get_property(dev->of_node, "shared-cb", NULL) != NULL) {

		err = of_property_read_u32(dev->of_node, "shared-cb",

				&sharedcb_count);