Re: [PATCH v10 4/4] crypto: hisilicon - register zip engine to uacce

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On Mon, 16 Dec 2019 11:08:17 +0800
Zhangfei Gao <zhangfei.gao@xxxxxxxxxx> wrote:

> Register qm to uacce framework for user crypto driver
> 
> Signed-off-by: Zhangfei Gao <zhangfei.gao@xxxxxxxxxx>
> Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>

Very nice to see how minimal the changes are.

Whilst uacce in general isn't crypto specific, as we are looking
at changes in a crypto driver, this will need a crypto Ack.

Herbert, this is about as non invasive as things can get and
provide a user space shared virtual addressing based interface.
What do you think?

>From my side, for what it's worth...

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

> ---
>  drivers/crypto/hisilicon/qm.c           | 236 +++++++++++++++++++++++++++++++-
>  drivers/crypto/hisilicon/qm.h           |  11 ++
>  drivers/crypto/hisilicon/zip/zip_main.c |  16 ++-
>  include/uapi/misc/uacce/hisi_qm.h       |  23 ++++
>  4 files changed, 278 insertions(+), 8 deletions(-)
>  create mode 100644 include/uapi/misc/uacce/hisi_qm.h
> 
> diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
> index b57da5e..1e923bc 100644
> --- a/drivers/crypto/hisilicon/qm.c
> +++ b/drivers/crypto/hisilicon/qm.c
> @@ -9,6 +9,9 @@
>  #include <linux/log2.h>
>  #include <linux/seq_file.h>
>  #include <linux/slab.h>
> +#include <linux/uacce.h>
> +#include <linux/uaccess.h>
> +#include <uapi/misc/uacce/hisi_qm.h>
>  #include "qm.h"
>  
>  /* eq/aeq irq enable */
> @@ -465,9 +468,14 @@ static void qm_cq_head_update(struct hisi_qp *qp)
>  
>  static void qm_poll_qp(struct hisi_qp *qp, struct hisi_qm *qm)
>  {
> -	struct qm_cqe *cqe = qp->cqe + qp->qp_status.cq_head;
> +	if (qp->event_cb) {
> +		qp->event_cb(qp);
> +		return;
> +	}
>  
>  	if (qp->req_cb) {
> +		struct qm_cqe *cqe = qp->cqe + qp->qp_status.cq_head;
> +
>  		while (QM_CQE_PHASE(cqe) == qp->qp_status.cqc_phase) {
>  			dma_rmb();
>  			qp->req_cb(qp, qp->sqe + qm->sqe_size *
> @@ -1269,7 +1277,7 @@ static int qm_qp_ctx_cfg(struct hisi_qp *qp, int qp_id, int pasid)
>   * @qp: The qp we want to start to run.
>   * @arg: Accelerator specific argument.
>   *
> - * After this function, qp can receive request from user. Return qp_id if
> + * After this function, qp can receive request from user. Return 0 if
>   * successful, Return -EBUSY if failed.
>   */
>  int hisi_qm_start_qp(struct hisi_qp *qp, unsigned long arg)
> @@ -1314,7 +1322,7 @@ int hisi_qm_start_qp(struct hisi_qp *qp, unsigned long arg)
>  
>  	dev_dbg(dev, "queue %d started\n", qp_id);
>  
> -	return qp_id;
> +	return 0;
>  }
>  EXPORT_SYMBOL_GPL(hisi_qm_start_qp);
>  
> @@ -1395,6 +1403,213 @@ static void hisi_qm_cache_wb(struct hisi_qm *qm)
>  	}
>  }
>  
> +static void qm_qp_event_notifier(struct hisi_qp *qp)
> +{
> +	wake_up_interruptible(&qp->uacce_q->wait);
> +}
> +
> +static int hisi_qm_get_available_instances(struct uacce_device *uacce)
> +{
> +	int i, ret;
> +	struct hisi_qm *qm = uacce->priv;
> +
> +	read_lock(&qm->qps_lock);
> +	for (i = 0, ret = 0; i < qm->qp_num; i++)
> +		if (!qm->qp_array[i])
> +			ret++;
> +	read_unlock(&qm->qps_lock);
> +
> +	return ret;
> +}
> +
> +static int hisi_qm_uacce_get_queue(struct uacce_device *uacce,
> +				   unsigned long arg,
> +				   struct uacce_queue *q)
> +{
> +	struct hisi_qm *qm = uacce->priv;
> +	struct hisi_qp *qp;
> +	u8 alg_type = 0;
> +
> +	qp = hisi_qm_create_qp(qm, alg_type);
> +	if (IS_ERR(qp))
> +		return PTR_ERR(qp);
> +
> +	q->priv = qp;
> +	q->uacce = uacce;
> +	qp->uacce_q = q;
> +	qp->event_cb = qm_qp_event_notifier;
> +	qp->pasid = arg;
> +
> +	return 0;
> +}
> +
> +static void hisi_qm_uacce_put_queue(struct uacce_queue *q)
> +{
> +	struct hisi_qp *qp = q->priv;
> +
> +	hisi_qm_cache_wb(qp->qm);
> +	hisi_qm_release_qp(qp);
> +}
> +
> +/* map sq/cq/doorbell to user space */
> +static int hisi_qm_uacce_mmap(struct uacce_queue *q,
> +			      struct vm_area_struct *vma,
> +			      struct uacce_qfile_region *qfr)
> +{
> +	struct hisi_qp *qp = q->priv;
> +	struct hisi_qm *qm = qp->qm;
> +	size_t sz = vma->vm_end - vma->vm_start;
> +	struct pci_dev *pdev = qm->pdev;
> +	struct device *dev = &pdev->dev;
> +	unsigned long vm_pgoff;
> +	int ret;
> +
> +	switch (qfr->type) {
> +	case UACCE_QFRT_MMIO:
> +		if (qm->ver == QM_HW_V2) {
> +			if (sz > PAGE_SIZE * (QM_DOORBELL_PAGE_NR +
> +			    QM_DOORBELL_SQ_CQ_BASE_V2 / PAGE_SIZE))
> +				return -EINVAL;
> +		} else {
> +			if (sz > PAGE_SIZE * QM_DOORBELL_PAGE_NR)
> +				return -EINVAL;
> +		}
> +
> +		vma->vm_flags |= VM_IO;
> +
> +		return remap_pfn_range(vma, vma->vm_start,
> +				       qm->phys_base >> PAGE_SHIFT,
> +				       sz, pgprot_noncached(vma->vm_page_prot));
> +	case UACCE_QFRT_DUS:
> +		if (sz != qp->qdma.size)
> +			return -EINVAL;
> +
> +		/*
> +		 * dma_mmap_coherent() requires vm_pgoff as 0
> +		 * restore vm_pfoff to initial value for mmap()
> +		 */
> +		vm_pgoff = vma->vm_pgoff;
> +		vma->vm_pgoff = 0;
> +		ret = dma_mmap_coherent(dev, vma, qp->qdma.va,
> +					qp->qdma.dma, sz);
> +		vma->vm_pgoff = vm_pgoff;
> +		return ret;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int hisi_qm_uacce_start_queue(struct uacce_queue *q)
> +{
> +	struct hisi_qp *qp = q->priv;
> +
> +	return hisi_qm_start_qp(qp, qp->pasid);
> +}
> +
> +static void hisi_qm_uacce_stop_queue(struct uacce_queue *q)
> +{
> +	hisi_qm_stop_qp(q->priv);
> +}
> +
> +static int qm_set_sqctype(struct uacce_queue *q, u16 type)
> +{
> +	struct hisi_qm *qm = q->uacce->priv;
> +	struct hisi_qp *qp = q->priv;
> +
> +	write_lock(&qm->qps_lock);
> +	qp->alg_type = type;
> +	write_unlock(&qm->qps_lock);
> +
> +	return 0;
> +}
> +
> +static long hisi_qm_uacce_ioctl(struct uacce_queue *q, unsigned int cmd,
> +				unsigned long arg)
> +{
> +	struct hisi_qp *qp = q->priv;
> +	struct hisi_qp_ctx qp_ctx;
> +
> +	if (cmd == UACCE_CMD_QM_SET_QP_CTX) {
> +		if (copy_from_user(&qp_ctx, (void __user *)arg,
> +				   sizeof(struct hisi_qp_ctx)))
> +			return -EFAULT;
> +
> +		if (qp_ctx.qc_type != 0 && qp_ctx.qc_type != 1)
> +			return -EINVAL;
> +
> +		qm_set_sqctype(q, qp_ctx.qc_type);
> +		qp_ctx.id = qp->qp_id;
> +
> +		if (copy_to_user((void __user *)arg, &qp_ctx,
> +				 sizeof(struct hisi_qp_ctx)))
> +			return -EFAULT;
> +	} else {
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct uacce_ops uacce_qm_ops = {
> +	.get_available_instances = hisi_qm_get_available_instances,
> +	.get_queue = hisi_qm_uacce_get_queue,
> +	.put_queue = hisi_qm_uacce_put_queue,
> +	.start_queue = hisi_qm_uacce_start_queue,
> +	.stop_queue = hisi_qm_uacce_stop_queue,
> +	.mmap = hisi_qm_uacce_mmap,
> +	.ioctl = hisi_qm_uacce_ioctl,
> +};
> +
> +static int qm_alloc_uacce(struct hisi_qm *qm)
> +{
> +	struct pci_dev *pdev = qm->pdev;
> +	struct uacce_device *uacce;
> +	unsigned long mmio_page_nr;
> +	unsigned long dus_page_nr;
> +	struct uacce_interface interface = {
> +		.flags = UACCE_DEV_SVA,
> +		.ops = &uacce_qm_ops,
> +	};
> +
> +	strncpy(interface.name, pdev->driver->name, sizeof(interface.name));
> +
> +	uacce = uacce_alloc(&pdev->dev, &interface);
> +	if (IS_ERR(uacce))
> +		return PTR_ERR(uacce);
> +
> +	if (uacce->flags & UACCE_DEV_SVA) {
> +		qm->use_sva = true;
> +	} else {
> +		/* only consider sva case */
> +		uacce_remove(uacce);
> +		return -EINVAL;
> +	}
> +
> +	uacce->is_vf = pdev->is_virtfn;
> +	uacce->priv = qm;
> +	uacce->algs = qm->algs;
> +
> +	if (qm->ver == QM_HW_V1) {
> +		mmio_page_nr = QM_DOORBELL_PAGE_NR;
> +		uacce->api_ver = HISI_QM_API_VER_BASE;
> +	} else {
> +		mmio_page_nr = QM_DOORBELL_PAGE_NR +
> +			QM_DOORBELL_SQ_CQ_BASE_V2 / PAGE_SIZE;
> +		uacce->api_ver = HISI_QM_API_VER2_BASE;
> +	}
> +
> +	dus_page_nr = (PAGE_SIZE - 1 + qm->sqe_size * QM_Q_DEPTH +
> +		       sizeof(struct qm_cqe) * QM_Q_DEPTH) >> PAGE_SHIFT;
> +
> +	uacce->qf_pg_num[UACCE_QFRT_MMIO] = mmio_page_nr;
> +	uacce->qf_pg_num[UACCE_QFRT_DUS]  = dus_page_nr;
> +
> +	qm->uacce = uacce;
> +
> +	return 0;
> +}
> +
>  /**
>   * hisi_qm_get_free_qp_num() - Get free number of qp in qm.
>   * @qm: The qm which want to get free qp.
> @@ -1437,10 +1652,14 @@ int hisi_qm_init(struct hisi_qm *qm)
>  		return -EINVAL;
>  	}
>  
> +	ret = qm_alloc_uacce(qm);
> +	if (ret < 0)
> +		dev_warn(&pdev->dev, "fail to alloc uacce (%d)\n", ret);
> +
>  	ret = pci_enable_device_mem(pdev);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "Failed to enable device mem!\n");
> -		return ret;
> +		goto err_remove_uacce;
>  	}
>  
>  	ret = pci_request_mem_regions(pdev, qm->dev_name);
> @@ -1449,8 +1668,9 @@ int hisi_qm_init(struct hisi_qm *qm)
>  		goto err_disable_pcidev;
>  	}
>  
> -	qm->io_base = ioremap(pci_resource_start(pdev, PCI_BAR_2),
> -			      pci_resource_len(qm->pdev, PCI_BAR_2));
> +	qm->phys_base = pci_resource_start(pdev, PCI_BAR_2);
> +	qm->phys_size = pci_resource_len(qm->pdev, PCI_BAR_2);
> +	qm->io_base = ioremap(qm->phys_base, qm->phys_size);
>  	if (!qm->io_base) {
>  		ret = -EIO;
>  		goto err_release_mem_regions;
> @@ -1493,6 +1713,8 @@ int hisi_qm_init(struct hisi_qm *qm)
>  	pci_release_mem_regions(pdev);
>  err_disable_pcidev:
>  	pci_disable_device(pdev);
> +err_remove_uacce:
> +	uacce_remove(qm->uacce);
>  
>  	return ret;
>  }
> @@ -1509,6 +1731,8 @@ void hisi_qm_uninit(struct hisi_qm *qm)
>  	struct pci_dev *pdev = qm->pdev;
>  	struct device *dev = &pdev->dev;
>  
> +	uacce_remove(qm->uacce);
> +
>  	if (qm->use_dma_api && qm->qdma.va) {
>  		hisi_qm_cache_wb(qm);
>  		dma_free_coherent(dev, qm->qdma.size,
> diff --git a/drivers/crypto/hisilicon/qm.h b/drivers/crypto/hisilicon/qm.h
> index 078b8f1..c096f80 100644
> --- a/drivers/crypto/hisilicon/qm.h
> +++ b/drivers/crypto/hisilicon/qm.h
> @@ -77,6 +77,9 @@
>  
>  #define HISI_ACC_SGL_SGE_NR_MAX		255
>  
> +/* page number for queue file region */
> +#define QM_DOORBELL_PAGE_NR		1
> +
>  enum qp_state {
>  	QP_STOP,
>  };
> @@ -162,7 +165,12 @@ struct hisi_qm {
>  	u32 error_mask;
>  	u32 msi_mask;
>  
> +	const char *algs;
>  	bool use_dma_api;
> +	bool use_sva;
> +	resource_size_t phys_base;
> +	resource_size_t phys_size;
> +	struct uacce_device *uacce;
>  };
>  
>  struct hisi_qp_status {
> @@ -192,10 +200,13 @@ struct hisi_qp {
>  	struct hisi_qp_ops *hw_ops;
>  	void *qp_ctx;
>  	void (*req_cb)(struct hisi_qp *qp, void *data);
> +	void (*event_cb)(struct hisi_qp *qp);
>  	struct work_struct work;
>  	struct workqueue_struct *wq;
>  
>  	struct hisi_qm *qm;
> +	u16 pasid;
> +	struct uacce_queue *uacce_q;
>  };
>  
>  int hisi_qm_init(struct hisi_qm *qm);
> diff --git a/drivers/crypto/hisilicon/zip/zip_main.c b/drivers/crypto/hisilicon/zip/zip_main.c
> index 93345f0..575faa3 100644
> --- a/drivers/crypto/hisilicon/zip/zip_main.c
> +++ b/drivers/crypto/hisilicon/zip/zip_main.c
> @@ -11,6 +11,7 @@
>  #include <linux/pci.h>
>  #include <linux/seq_file.h>
>  #include <linux/topology.h>
> +#include <linux/uacce.h>
>  #include "zip.h"
>  
>  #define PCI_DEVICE_ID_ZIP_PF		0xa250
> @@ -350,8 +351,14 @@ static void hisi_zip_set_user_domain_and_cache(struct hisi_zip *hisi_zip)
>  	writel(AXUSER_BASE, base + HZIP_BD_RUSER_32_63);
>  	writel(AXUSER_BASE, base + HZIP_SGL_RUSER_32_63);
>  	writel(AXUSER_BASE, base + HZIP_BD_WUSER_32_63);
> -	writel(AXUSER_BASE, base + HZIP_DATA_RUSER_32_63);
> -	writel(AXUSER_BASE, base + HZIP_DATA_WUSER_32_63);
> +
> +	if (hisi_zip->qm.use_sva) {
> +		writel(AXUSER_BASE | AXUSER_SSV, base + HZIP_DATA_RUSER_32_63);
> +		writel(AXUSER_BASE | AXUSER_SSV, base + HZIP_DATA_WUSER_32_63);
> +	} else {
> +		writel(AXUSER_BASE, base + HZIP_DATA_RUSER_32_63);
> +		writel(AXUSER_BASE, base + HZIP_DATA_WUSER_32_63);
> +	}
>  
>  	/* let's open all compression/decompression cores */
>  	writel(DECOMP_CHECK_ENABLE | ALL_COMP_DECOMP_EN,
> @@ -792,6 +799,7 @@ static int hisi_zip_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	qm->pdev = pdev;
>  	qm->ver = rev_id;
>  
> +	qm->algs = "zlib\ngzip";
>  	qm->sqe_size = HZIP_SQE_SIZE;
>  	qm->dev_name = hisi_zip_name;
>  	qm->fun_type = (pdev->device == PCI_DEVICE_ID_ZIP_PF) ? QM_HW_PF :
> @@ -835,6 +843,10 @@ static int hisi_zip_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  
>  	hisi_zip_add_to_list(hisi_zip);
>  
> +	ret = uacce_register(qm->uacce);
> +	if (ret)
> +		goto err_qm_uninit;
> +
>  	if (qm->fun_type == QM_HW_PF && vfs_num > 0) {
>  		ret = hisi_zip_sriov_enable(pdev, vfs_num);
>  		if (ret < 0)
> diff --git a/include/uapi/misc/uacce/hisi_qm.h b/include/uapi/misc/uacce/hisi_qm.h
> new file mode 100644
> index 0000000..6435f0b
> --- /dev/null
> +++ b/include/uapi/misc/uacce/hisi_qm.h
> @@ -0,0 +1,23 @@
> +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> +#ifndef _UAPI_HISI_QM_H
> +#define _UAPI_HISI_QM_H
> +
> +#include <linux/types.h>
> +
> +/**
> + * struct hisi_qp_ctx - User data for hisi qp.
> + * @id: qp_index return to user space
> + * @qc_type: Accelerator algorithm type
> + */
> +struct hisi_qp_ctx {
> +	__u16 id;
> +	__u16 qc_type;
> +};
> +
> +#define HISI_QM_API_VER_BASE "hisi_qm_v1"
> +#define HISI_QM_API_VER2_BASE "hisi_qm_v2"
> +
> +/* UACCE_CMD_QM_SET_QP_CTX: Set qp algorithm type */
> +#define UACCE_CMD_QM_SET_QP_CTX	_IOWR('H', 10, struct hisi_qp_ctx)
> +
> +#endif






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