[PATCH 6/7] crypto: add sdmdev support to Hisilicon QM

Kenneth Lee
2018-09-03T00:52:51Z

From: Kenneth Lee <liguozhu@hisilicon.com>

This commit add spimdev support to the Hislicon QM driver, any
accelerator that use QM can expose its queues to the user space.

Signed-off-by: Kenneth Lee <liguozhu@hisilicon.com>
Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Hao Fang <fanghao11@huawei.com>
Signed-off-by: Zaibo Xu <xuzaibo@huawei.com>
---
drivers/crypto/hisilicon/Kconfig | 10 ++
drivers/crypto/hisilicon/qm.c | 159 +++++++++++++++++++++++++++++++
drivers/crypto/hisilicon/qm.h | 12 +++
3 files changed, 181 insertions(+)

diff --git a/drivers/crypto/hisilicon/Kconfig b/drivers/crypto/hisilicon/Kconfig
index 1d155708cd69..b85fab48fdab 100644
--- a/drivers/crypto/hisilicon/Kconfig
+++ b/drivers/crypto/hisilicon/Kconfig
@@ -17,6 +17,16 @@ config CRYPTO_DEV_HISI_SEC
To compile this as a module, choose M here: the module
will be called hisi_sec.

+config CRYPTO_DEV_HISI_SDMDEV
+ bool "Enable SDMDEV interface"
+ depends on CRYPTO_DEV_HISILICON
+ select VFIO_SDMDEV
+ help
+ Enable this enable the SDMDEV, "shared IOMMU Domain Mediated Device"
+ interface for all Hisilicon accelerators if they can. The SDMDEV
+ enable the WarpDrive user space accelerator driver to access the
+ hardware function directly.
+
config CRYPTO_DEV_HISI_QM
tristate
depends on ARM64 && PCI
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index ea618b4d0929..c94e138e9b99 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -639,6 +639,155 @@ int hisi_qp_send(struct hisi_qp *qp, void *msg)
}
EXPORT_SYMBOL_GPL(hisi_qp_send);

+#ifdef CONFIG_CRYPTO_DEV_HISI_SDMDEV
+/* mdev->supported_type_groups */
+static struct attribute *hisi_qm_type_attrs[] = {
+ VFIO_SDMDEV_DEFAULT_MDEV_TYPE_ATTRS,
+ NULL,
+};
+static struct attribute_group hisi_qm_type_group = {
+ .attrs = hisi_qm_type_attrs,
+};
+static struct attribute_group *mdev_type_groups[] = {
+ &hisi_qm_type_group,
+ NULL,
+};
+
+static void qm_qp_event_notifier(struct hisi_qp *qp)
+{
+ vfio_sdmdev_wake_up(qp->sdmdev_q);
+}
+
+static int hisi_qm_get_queue(struct vfio_sdmdev *sdmdev,
+ struct vfio_sdmdev_queue **q)
+{
+ struct qm_info *qm = sdmdev->priv;
+ struct hisi_qp *qp = NULL;
+ struct vfio_sdmdev_queue *wd_q;
+ u8 alg_type = 0; /* fix me here */
+ int ret;
+
+ qp = hisi_qm_create_qp(qm, alg_type);
+ if (IS_ERR(qp))
+ return PTR_ERR(qp);
+
+ wd_q = kzalloc(sizeof(struct vfio_sdmdev_queue), GFP_KERNEL);
+ if (!wd_q) {
+ ret = -ENOMEM;
+ goto err_with_qp;
+ }
+
+ wd_q->priv = qp;
+ wd_q->sdmdev = sdmdev;
+ *q = wd_q;
+ qp->sdmdev_q = wd_q;
+ qp->event_cb = qm_qp_event_notifier;
+
+ return 0;
+
+err_with_qp:
+ hisi_qm_release_qp(qp);
+ return ret;
+}
+
+void hisi_qm_put_queue(struct vfio_sdmdev_queue *q)
+{
+ struct hisi_qp *qp = q->priv;
+
+ hisi_qm_release_qp(qp);
+ kfree(q);
+}
+
+/* map sq/cq/doorbell to user space */
+static int hisi_qm_mmap(struct vfio_sdmdev_queue *q,
+ struct vm_area_struct *vma)
+{
+ struct hisi_qp *qp = (struct hisi_qp *)q->priv;
+ struct qm_info *qm = qp->qm;
+ struct device *dev = &qm->pdev->dev;
+ size_t sz = vma->vm_end - vma->vm_start;
+ u8 region;
+
+ vma->vm_flags |= (VM_IO | VM_LOCKED | VM_DONTEXPAND | VM_DONTDUMP);
+ region = _VFIO_SDMDEV_REGION(vma->vm_pgoff);
+
+ switch (region) {
+ case 0:
+ if (sz > PAGE_SIZE)
+ return -EINVAL;
+ /*
+ * Warning: This is not safe as multiple queues use the same
+ * doorbell, v1 hardware interface problem. v2 will fix it
+ */
+ return remap_pfn_range(vma, vma->vm_start,
+ qm->phys_base >> PAGE_SHIFT,
+ sz, pgprot_noncached(vma->vm_page_prot));
+ case 1:
+ vma->vm_pgoff = 0;
+ if (sz > qp->scqe.size)
+ return -EINVAL;
+
+ return dma_mmap_coherent(dev, vma, qp->scqe.addr, qp->scqe.dma,
+ sz);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int hisi_qm_start_queue(struct vfio_sdmdev_queue *q)
+{
+ struct hisi_qp *qp = q->priv;
+
+#ifdef CONFIG_IOMMU_SVA
+ return hisi_qm_start_qp(qp, q->pasid);
+#else
+ return hisi_qm_start_qp(qp, 0);
+#endif
+}
+
+static void hisi_qm_stop_queue(struct vfio_sdmdev_queue *q)
+{
+ /* need to stop hardware, but can not support in v1 */
+}
+
+static const struct vfio_sdmdev_ops qm_ops = {
+ .get_queue = hisi_qm_get_queue,
+ .put_queue = hisi_qm_put_queue,
+ .start_queue = hisi_qm_start_queue,
+ .stop_queue = hisi_qm_stop_queue,
+ .mmap = hisi_qm_mmap,
+};
+
+static int qm_register_sdmdev(struct qm_info *qm)
+{
+ struct pci_dev *pdev = qm->pdev;
+ struct vfio_sdmdev *sdmdev = &qm->sdmdev;
+
+ sdmdev->iommu_type = VFIO_TYPE1_IOMMU;
+
+#ifdef CONFIG_IOMMU_SVA
+ sdmdev->dma_flag = VFIO_SDMDEV_DMA_MULTI_PROC_MAP;
+#else
+ sdmdev->dma_flag = VFIO_SDMDEV_DMA_SINGLE_PROC_MAP;
+#endif
+
+ sdmdev->name = qm->dev_name;
+ sdmdev->dev = &pdev->dev;
+ sdmdev->is_vf = pdev->is_virtfn;
+ sdmdev->priv = qm;
+ sdmdev->api_ver = "hisi_qm_v1";
+ sdmdev->flags = 0;
+
+ sdmdev->mdev_fops.mdev_attr_groups = qm->mdev_dev_groups;
+ hisi_qm_type_group.name = qm->dev_name;
+ sdmdev->mdev_fops.supported_type_groups = mdev_type_groups;
+ sdmdev->ops = &qm_ops;
+
+ return vfio_sdmdev_register(sdmdev);
+}
+#endif
+
int hisi_qm_init(const char *dev_name, struct qm_info *qm)
{
struct pci_dev *pdev = qm->pdev;
@@ -769,6 +918,12 @@ int hisi_qm_start(struct qm_info *qm)
if (ret)
goto err_with_cqc;

+#ifdef CONFIG_CRYPTO_DEV_HISI_SDMDEV
+ ret = qm_register_sdmdev(qm);
+ if (ret)
+ goto err_with_cqc;
+#endif
+
writel(0x0, QM_ADDR(qm, QM_VF_EQ_INT_MASK));

return 0;
@@ -795,6 +950,10 @@ void hisi_qm_stop(struct qm_info *qm)
struct pci_dev *pdev = qm->pdev;
struct device *dev = &pdev->dev;

+#ifdef CONFIG_CRYPTO_DEV_HISI_SDMDEV
+ vfio_sdmdev_unregister(&qm->sdmdev);
+#endif
+
free_irq(pci_irq_vector(pdev, 0), qm);
qm_uninit_q_buffer(dev, &qm->cqc);
kfree(qm->qp_array);
diff --git a/drivers/crypto/hisilicon/qm.h b/drivers/crypto/hisilicon/qm.h
index 0e81182ac6a8..0d24e0bd42e8 100644
--- a/drivers/crypto/hisilicon/qm.h
+++ b/drivers/crypto/hisilicon/qm.h
@@ -8,6 +8,10 @@
#include <linux/pci.h>
#include <linux/slab.h>

+#ifdef CONFIG_CRYPTO_DEV_HISI_SDMDEV
+#include <linux/vfio_sdmdev.h>
+#endif
+
#define QM_CQE_SIZE 16
/* default queue depth for sq/cq/eq */
#define QM_Q_DEPTH 1024
@@ -59,6 +63,10 @@ struct qm_info {

struct hisi_acc_qm_hw_ops *ops;

+#ifdef CONFIG_CRYPTO_DEV_HISI_SDMDEV
+ struct vfio_sdmdev sdmdev;
+ const struct attribute_group **mdev_dev_groups;
+#endif
};
#define QM_ADDR(qm, off) ((qm)->io_base + off)

@@ -89,6 +97,10 @@ struct hisi_qp {

struct qm_info *qm;

+#ifdef CONFIG_CRYPTO_DEV_HISI_SDMDEV
+ struct vfio_sdmdev_queue *sdmdev_q;
+#endif
+
/* for crypto sync API */
struct completion completion;

--
2.17.1