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net: qrtr: gunyah: Add dynamic fifo allocation

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If a static carveout is not available for VMs they should be able to
fallback to a dynamic allocation from the CMA. Add support to dma alloc
contigous memory and share that memory to the VM.

Change-Id: Ie8c5b961b530102d9046818a6e0b31a70e05b896
Signed-off-by: Chris Lew <quic_clew@quicinc.com>
This commit is contained in:
Chris Lew 2022-04-13 17:25:45 -07:00 committed by Gerrit - the friendly Code Review server
parent 948ff2bd1a
commit 7c2366a03b
1 changed files with 44 additions and 2 deletions
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46
net/qrtr/gunyah.c
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@ -552,6 +552,24 @@ static struct device_node *qrtr_gunyah_svm_of_parse(struct qrtr_gunyah_dev *qdev
return shm_np;
}
static int qrtr_gunyah_alloc_fifo(struct qrtr_gunyah_dev *qdev)
{
struct device *dev = qdev->dev;
resource_size_t size;
size = FIFO_1_START + FIFO_SIZE;
qdev->base = dma_alloc_attrs(dev, size, &qdev->res.start, GFP_KERNEL,
DMA_ATTR_FORCE_CONTIGUOUS);
if (!qdev->base)
return -ENOMEM;
qdev->res.end = qdev->res.start + size - 1;
qdev->size = size;
return 0;
}
static int qrtr_gunyah_map_memory(struct qrtr_gunyah_dev *qdev)
{
struct device *dev = qdev->dev;
@ -559,8 +577,11 @@ static int qrtr_gunyah_map_memory(struct qrtr_gunyah_dev *qdev)
resource_size_t size;
int ret;
np = of_parse_phandle(dev->of_node, "shared-buffer", 0);
if (!np) {
if (qdev->master) {
np = of_parse_phandle(dev->of_node, "shared-buffer", 0);
if (!np)
return qrtr_gunyah_alloc_fifo(qdev);
} else {
np = qrtr_gunyah_svm_of_parse(qdev);
if (!np) {
dev_err(dev, "can't parse shared mem node!\n");
@ -679,11 +700,32 @@ static int qrtr_gunyah_probe(struct platform_device *pdev)
static int qrtr_gunyah_remove(struct platform_device *pdev)
{
struct qrtr_gunyah_dev *qdev = dev_get_drvdata(&pdev->dev);
struct device_node *np;
gh_vmid_t peer_vmid;
gh_vmid_t self_vmid;
cancel_work_sync(&qdev->work);
gh_dbl_tx_unregister(qdev->tx_dbl);
gh_dbl_rx_unregister(qdev->rx_dbl);
if (!qdev->master)
return 0;
if (gh_rm_get_vmid(qdev->peer_name, &peer_vmid))
return 0;
if (gh_rm_get_vmid(GH_PRIMARY_VM, &self_vmid))
return 0;
qrtr_gunyah_unshare_mem(qdev, self_vmid, peer_vmid);
np = of_parse_phandle(qdev->dev->of_node, "shared-buffer", 0);
if (np) {
of_node_put(np);
return 0;
}
dma_free_attrs(qdev->dev, qdev->size, qdev->base, qdev->res.start,
DMA_ATTR_FORCE_CONTIGUOUS);
return 0;
}