On Mon, Dec 19, 2022 at 10:35:11AM +0200, Alvaro Karsz wrote:
> This commit includes:
> 1) The driver to manage the controlplane over vDPA bus.
> 2) A HW monitor device to read health values from the DPU.
>
> Signed-off-by: Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>
> --
> v2:
> - Auto detect the BAR used for communication.
> - When waiting for the DPU to write a config, wait for 5secs
> before giving up on the device.
> - Return EOPNOTSUPP error code in vDPA set_vq_state callback if
> the vq state is not the same as the initial one.
> - Implement a vDPA reset callback.
> - Wait for an ACK when sending a message to the DPU.
> - Add endianness comments on 64bit read/write functions.
> - Remove the get_iova_range and free vDPA callbacks.
> - Usage of managed device functions to ioremap a region.
> - Call pci_set_drvdata and pci_set_master before
> vdpa_register_device.
> - Create DMA isolation between the vDPA devices by using the
> chip SR-IOV feature.
> Every vDPA device gets a PCIe VF with its own DMA device.
>
> v3:
> - Validate vDPA config length while receiving the DPU's config,
> not while trying to write the vDPA config to the DPU.
> - Request IRQs when vDPA status is set to
> VIRTIO_CONFIG_S_DRIVER_OK.
> - Remove snet_reset_dev() from the PCI remove function for a VF.
> v4:
> - Get SolidRun vendor ID from pci_ids
> v5:
> - Remove "select HWMON" from Kconfig.
> Usage of "depends on HWMON || HWMON=n" instead and usage of
> IS_ENABLED(CONFIG_HWMON) when calling to snet hwmon functions.
> snet_hwmon.c is compiled only if CONFIG_HWMON is defined.
> - Remove the #include <linux/hwmon-sysfs.h> from snet_hwmon.c.
> - Remove the unnecessary (long) casting from snet_hwmon_read_reg.
> - Remove the "_hwmon" ending from the hwmon name.
> - Usage of IS_ERR macro to check if devm_hwmon_device_register_with_info
> failed.
> - Replace schedule() with usleep_range() in the "hot loop" in
> psnet_detect_bar.
> - Remove the logging of memory allocation failures.
> - Add parenthesis to arguments in SNET_* macros.
> - Prefer sizeof(*variable) instead of sizeof(struct x) when allocating
> memory.
> v6:
> - SNET_WRN -> SNET_WARN.
> ---
> MAINTAINERS | 4 +
> drivers/vdpa/Kconfig | 10 +
> drivers/vdpa/Makefile | 1 +
> drivers/vdpa/solidrun/Makefile | 6 +
> drivers/vdpa/solidrun/snet_hwmon.c | 188 +++++
> drivers/vdpa/solidrun/snet_main.c | 1111 ++++++++++++++++++++++++++++
> drivers/vdpa/solidrun/snet_vdpa.h | 196 +++++
> 7 files changed, 1516 insertions(+)
> create mode 100644 drivers/vdpa/solidrun/Makefile
> create mode 100644 drivers/vdpa/solidrun/snet_hwmon.c
> create mode 100644 drivers/vdpa/solidrun/snet_main.c
> create mode 100644 drivers/vdpa/solidrun/snet_vdpa.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a608f19da3a..7f4d9dcb760 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -21955,6 +21955,10 @@ IFCVF VIRTIO DATA PATH ACCELERATOR
> R: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
> F: drivers/vdpa/ifcvf/
>
> +SNET DPU VIRTIO DATA PATH ACCELERATOR
> +R: Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>
> +F: drivers/vdpa/solidrun/
> +
> VIRTIO BALLOON
> M: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
> M: David Hildenbrand <david@xxxxxxxxxx>
> diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
> index 50f45d03761..79625c7cc46 100644
> --- a/drivers/vdpa/Kconfig
> +++ b/drivers/vdpa/Kconfig
> @@ -86,4 +86,14 @@ config ALIBABA_ENI_VDPA
> VDPA driver for Alibaba ENI (Elastic Network Interface) which is built upon
> virtio 0.9.5 specification.
>
> + config SNET_VDPA
> + tristate "SolidRun's vDPA driver for SolidNET"
> + depends on PCI_MSI && PCI_IOV && (HWMON || HWMON=n)
could we add a comment explaining this trick please?
can be patch on top ...
> + help
> + vDPA driver for SolidNET DPU.
> + With this driver, the VirtIO dataplane can be
> + offloaded to a SolidNET DPU.
> + This driver includes a HW monitor device that
> + reads health values from the DPU.
> +
> endif # VDPA
> diff --git a/drivers/vdpa/Makefile b/drivers/vdpa/Makefile
> index 15665563a7f..59396ff2a31 100644
> --- a/drivers/vdpa/Makefile
> +++ b/drivers/vdpa/Makefile
> @@ -6,3 +6,4 @@ obj-$(CONFIG_IFCVF) += ifcvf/
> obj-$(CONFIG_MLX5_VDPA) += mlx5/
> obj-$(CONFIG_VP_VDPA) += virtio_pci/
> obj-$(CONFIG_ALIBABA_ENI_VDPA) += alibaba/
> +obj-$(CONFIG_SNET_VDPA) += solidrun/
> diff --git a/drivers/vdpa/solidrun/Makefile b/drivers/vdpa/solidrun/Makefile
> new file mode 100644
> index 00000000000..c0aa3415bf7
> --- /dev/null
> +++ b/drivers/vdpa/solidrun/Makefile
> @@ -0,0 +1,6 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_SNET_VDPA) += snet_vdpa.o
> +snet_vdpa-$(CONFIG_SNET_VDPA) += snet_main.o
> +ifdef CONFIG_HWMON
> +snet_vdpa-$(CONFIG_SNET_VDPA) += snet_hwmon.o
> +endif
> diff --git a/drivers/vdpa/solidrun/snet_hwmon.c b/drivers/vdpa/solidrun/snet_hwmon.c
> new file mode 100644
> index 00000000000..e695e36ff75
> --- /dev/null
> +++ b/drivers/vdpa/solidrun/snet_hwmon.c
> @@ -0,0 +1,188 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * SolidRun DPU driver for control plane
> + *
> + * Copyright (C) 2022 SolidRun
> + *
> + * Author: Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>
> + *
> + */
> +#include <linux/hwmon.h>
> +
> +#include "snet_vdpa.h"
> +
> +/* Monitor offsets */
> +#define SNET_MON_TMP0_IN_OFF 0x00
> +#define SNET_MON_TMP0_MAX_OFF 0x08
> +#define SNET_MON_TMP0_CRIT_OFF 0x10
> +#define SNET_MON_TMP1_IN_OFF 0x18
> +#define SNET_MON_TMP1_CRIT_OFF 0x20
> +#define SNET_MON_CURR_IN_OFF 0x28
> +#define SNET_MON_CURR_MAX_OFF 0x30
> +#define SNET_MON_CURR_CRIT_OFF 0x38
> +#define SNET_MON_PWR_IN_OFF 0x40
> +#define SNET_MON_VOLT_IN_OFF 0x48
> +#define SNET_MON_VOLT_CRIT_OFF 0x50
> +#define SNET_MON_VOLT_LCRIT_OFF 0x58
> +
> +static void snet_hwmon_read_reg(struct psnet *psnet, u32 reg, long *out)
> +{
> + *out = psnet_read64(psnet, psnet->cfg.hwmon_off + reg);
> +}
> +
> +static umode_t snet_howmon_is_visible(const void *data,
> + enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + return 0444;
> +}
> +
> +static int snet_howmon_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val)
> +{
> + struct psnet *psnet = dev_get_drvdata(dev);
> + int ret = 0;
> +
> + switch (type) {
> + case hwmon_in:
> + switch (attr) {
> + case hwmon_in_lcrit:
> + snet_hwmon_read_reg(psnet, SNET_MON_VOLT_LCRIT_OFF, val);
> + break;
> + case hwmon_in_crit:
> + snet_hwmon_read_reg(psnet, SNET_MON_VOLT_CRIT_OFF, val);
> + break;
> + case hwmon_in_input:
> + snet_hwmon_read_reg(psnet, SNET_MON_VOLT_IN_OFF, val);
> + break;
> + default:
> + ret = -EOPNOTSUPP;
> + break;
> + }
> + break;
> +
> + case hwmon_power:
> + switch (attr) {
> + case hwmon_power_input:
> + snet_hwmon_read_reg(psnet, SNET_MON_PWR_IN_OFF, val);
> + break;
> +
> + default:
> + ret = -EOPNOTSUPP;
> + break;
> + }
> + break;
> +
> + case hwmon_curr:
> + switch (attr) {
> + case hwmon_curr_input:
> + snet_hwmon_read_reg(psnet, SNET_MON_CURR_IN_OFF, val);
> + break;
> + case hwmon_curr_max:
> + snet_hwmon_read_reg(psnet, SNET_MON_CURR_MAX_OFF, val);
> + break;
> + case hwmon_curr_crit:
> + snet_hwmon_read_reg(psnet, SNET_MON_CURR_CRIT_OFF, val);
> + break;
> + default:
> + ret = -EOPNOTSUPP;
> + break;
> + }
> + break;
> +
> + case hwmon_temp:
> + switch (attr) {
> + case hwmon_temp_input:
> + if (channel == 0)
> + snet_hwmon_read_reg(psnet, SNET_MON_TMP0_IN_OFF, val);
> + else
> + snet_hwmon_read_reg(psnet, SNET_MON_TMP1_IN_OFF, val);
> + break;
> + case hwmon_temp_max:
> + if (channel == 0)
> + snet_hwmon_read_reg(psnet, SNET_MON_TMP0_MAX_OFF, val);
> + else
> + ret = -EOPNOTSUPP;
> + break;
> + case hwmon_temp_crit:
> + if (channel == 0)
> + snet_hwmon_read_reg(psnet, SNET_MON_TMP0_CRIT_OFF, val);
> + else
> + snet_hwmon_read_reg(psnet, SNET_MON_TMP1_CRIT_OFF, val);
> + break;
> +
> + default:
> + ret = -EOPNOTSUPP;
> + break;
> + }
> + break;
> +
> + default:
> + ret = -EOPNOTSUPP;
> + break;
> + }
> + return ret;
> +}
> +
> +static int snet_hwmon_read_string(struct device *dev,
> + enum hwmon_sensor_types type, u32 attr,
> + int channel, const char **str)
> +{
> + int ret = 0;
> +
> + switch (type) {
> + case hwmon_in:
> + *str = "main_vin";
> + break;
> + case hwmon_power:
> + *str = "soc_pin";
> + break;
> + case hwmon_curr:
> + *str = "soc_iin";
> + break;
> + case hwmon_temp:
> + if (channel == 0)
> + *str = "power_stage_temp";
> + else
> + *str = "ic_junction_temp";
> + break;
> + default:
> + ret = -EOPNOTSUPP;
> + break;
> + }
> + return ret;
> +}
> +
> +static const struct hwmon_ops snet_hwmon_ops = {
> + .is_visible = snet_howmon_is_visible,
> + .read = snet_howmon_read,
> + .read_string = snet_hwmon_read_string
> +};
> +
> +static const struct hwmon_channel_info *snet_hwmon_info[] = {
> + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_LABEL,
> + HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_LABEL),
> + HWMON_CHANNEL_INFO(power, HWMON_P_INPUT | HWMON_P_LABEL),
> + HWMON_CHANNEL_INFO(curr, HWMON_C_INPUT | HWMON_C_MAX | HWMON_C_CRIT | HWMON_C_LABEL),
> + HWMON_CHANNEL_INFO(in, HWMON_I_INPUT | HWMON_I_CRIT | HWMON_I_LCRIT | HWMON_I_LABEL),
> + NULL
> +};
> +
> +static const struct hwmon_chip_info snet_hwmono_info = {
> + .ops = &snet_hwmon_ops,
> + .info = snet_hwmon_info,
> +};
> +
> +/* Create an HW monitor device */
> +void psnet_create_hwmon(struct pci_dev *pdev)
> +{
> + struct device *hwmon;
> + struct psnet *psnet = pci_get_drvdata(pdev);
> +
> + snprintf(psnet->hwmon_name, SNET_NAME_SIZE, "snet_%s", pci_name(pdev));
> + hwmon = devm_hwmon_device_register_with_info(&pdev->dev, psnet->hwmon_name, psnet,
> + &snet_hwmono_info, NULL);
> + /* The monitor is not mandatory, Just alert user in case of an error */
> + if (IS_ERR(hwmon))
> + SNET_WARN(pdev, "Failed to create SNET hwmon, error %ld\n", PTR_ERR(hwmon));
> +}
> diff --git a/drivers/vdpa/solidrun/snet_main.c b/drivers/vdpa/solidrun/snet_main.c
> new file mode 100644
> index 00000000000..d438a89b359
> --- /dev/null
> +++ b/drivers/vdpa/solidrun/snet_main.c
> @@ -0,0 +1,1111 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * SolidRun DPU driver for control plane
> + *
> + * Copyright (C) 2022 SolidRun
> + *
> + * Author: Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>
> + *
> + */
> +#include <linux/iopoll.h>
> +
> +#include "snet_vdpa.h"
> +
> +/* SNET DPU device ID */
> +#define SNET_DEVICE_ID 0x1000
> +/* SNET signature */
> +#define SNET_SIGNATURE 0xD0D06363
> +/* Max. config version that we can work with */
> +#define SNET_CFG_VERSION 0x1
> +/* Queue align */
> +#define SNET_QUEUE_ALIGNMENT PAGE_SIZE
> +/* Kick value to notify that new data is available */
> +#define SNET_KICK_VAL 0x1
> +#define SNET_CONFIG_OFF 0x0
> +/* ACK timeout for a message */
> +#define SNET_ACK_TIMEOUT 2000000
> +/* How long we are willing to wait for a SNET device */
> +#define SNET_DETECT_TIMEOUT 5000000
> +/* How long should we wait for the DPU to read our config */
> +#define SNET_READ_CFG_TIMEOUT 3000000
> +/* Size of configs written to the DPU */
> +#define SNET_GENERAL_CFG_LEN 36
> +#define SNET_GENERAL_CFG_VQ_LEN 40
> +
> +enum snet_msg {
> + SNET_MSG_DESTROY = 1,
> +};
> +
> +static struct snet *vdpa_to_snet(struct vdpa_device *vdpa)
> +{
> + return container_of(vdpa, struct snet, vdpa);
> +}
> +
> +static int snet_wait_for_msg_ack(struct snet *snet)
> +{
> + struct pci_dev *pdev = snet->pdev;
> + int ret;
> + u32 val;
> +
> + /* The DPU will clear the messages offset once messages
> + * are processed.
> + */
> + ret = readx_poll_timeout(ioread32, snet->bar + snet->psnet->cfg.msg_off,
> + val, !val, 10, SNET_ACK_TIMEOUT);
> + if (ret)
> + SNET_WARN(pdev, "Timeout waiting for message ACK\n");
> +
> + return ret;
> +}
> +
> +/* Sends a message to the DPU.
> + * If blocking is set, the function will return once the
> + * message was processed by the DPU (or timeout).
> + */
> +static int snet_send_msg(struct snet *snet, u32 msg, bool blocking)
> +{
> + int ret = 0;
> +
> + /* Make sure the DPU acked last message before issuing a new one */
> + ret = snet_wait_for_msg_ack(snet);
> + if (ret)
> + return ret;
> +
> + /* Write the message */
> + snet_write32(snet, snet->psnet->cfg.msg_off, msg);
> +
> + if (blocking)
> + ret = snet_wait_for_msg_ack(snet);
> + else /* If non-blocking, flush the write by issuing a read */
> + snet_read32(snet, snet->psnet->cfg.msg_off);
> +
> + return ret;
> +}
> +
> +static irqreturn_t snet_cfg_irq_hndlr(int irq, void *data)
> +{
> + struct snet *snet = data;
> + /* Call callback if any */
> + if (snet->cb.callback)
> + return snet->cb.callback(snet->cb.private);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t snet_vq_irq_hndlr(int irq, void *data)
> +{
> + struct snet_vq *vq = data;
> + /* Call callback if any */
> + if (vq->cb.callback)
> + return vq->cb.callback(vq->cb.private);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void snet_free_irqs(struct snet *snet)
> +{
> + struct psnet *psnet = snet->psnet;
> + struct pci_dev *pdev;
> + u32 i;
> +
> + /* Which Device allcoated the IRQs? */
> + if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF))
> + pdev = snet->pdev->physfn;
> + else
> + pdev = snet->pdev;
> +
> + /* Free config's IRQ */
> + if (snet->cfg_irq != -1) {
> + devm_free_irq(&pdev->dev, snet->cfg_irq, snet);
> + snet->cfg_irq = -1;
> + }
> + /* Free VQ IRQs */
> + for (i = 0; i < snet->cfg->vq_num; i++) {
> + if (snet->vqs[i] && snet->vqs[i]->irq != -1) {
> + devm_free_irq(&pdev->dev, snet->vqs[i]->irq, snet->vqs[i]);
> + snet->vqs[i]->irq = -1;
> + }
> + }
> +
> + /* IRQ vectors are freed when the pci remove callback is called */
> +}
> +
> +static int snet_set_vq_address(struct vdpa_device *vdev, u16 idx, u64 desc_area,
> + u64 driver_area, u64 device_area)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> + /* save received parameters in vqueue sturct */
> + snet->vqs[idx]->desc_area = desc_area;
> + snet->vqs[idx]->driver_area = driver_area;
> + snet->vqs[idx]->device_area = device_area;
> +
> + return 0;
> +}
> +
> +static void snet_set_vq_num(struct vdpa_device *vdev, u16 idx, u32 num)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> + /* save num in vqueue */
> + snet->vqs[idx]->num = num;
> +}
> +
> +static void snet_kick_vq(struct vdpa_device *vdev, u16 idx)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> + /* not ready - ignore */
> + if (!snet->vqs[idx]->ready)
> + return;
> +
> + iowrite32(SNET_KICK_VAL, snet->vqs[idx]->kick_ptr);
> +}
> +
> +static void snet_set_vq_cb(struct vdpa_device *vdev, u16 idx, struct vdpa_callback *cb)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + snet->vqs[idx]->cb.callback = cb->callback;
> + snet->vqs[idx]->cb.private = cb->private;
> +}
> +
> +static void snet_set_vq_ready(struct vdpa_device *vdev, u16 idx, bool ready)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + snet->vqs[idx]->ready = ready;
> +}
> +
> +static bool snet_get_vq_ready(struct vdpa_device *vdev, u16 idx)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return snet->vqs[idx]->ready;
> +}
> +
> +static int snet_set_vq_state(struct vdpa_device *vdev, u16 idx, const struct vdpa_vq_state *state)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> + /* Setting the VQ state is not supported.
> + * If the asked state is the same as the initial one
> + * we can ignore it.
> + */
> + if (SNET_HAS_FEATURE(snet, VIRTIO_F_RING_PACKED)) {
> + const struct vdpa_vq_state_packed *p = &state->packed;
> +
> + if (p->last_avail_counter == 1 && p->last_used_counter == 1 &&
> + p->last_avail_idx == 0 && p->last_used_idx == 0)
> + return 0;
> + } else {
> + const struct vdpa_vq_state_split *s = &state->split;
> +
> + if (s->avail_index == 0)
> + return 0;
> + }
> +
> + return -EOPNOTSUPP;
> +}
> +
> +static int snet_get_vq_state(struct vdpa_device *vdev, u16 idx, struct vdpa_vq_state *state)
> +{
> + /* Not supported */
> + return -EOPNOTSUPP;
> +}
> +
> +static int snet_get_vq_irq(struct vdpa_device *vdev, u16 idx)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return snet->vqs[idx]->irq;
> +}
> +
> +static u32 snet_get_vq_align(struct vdpa_device *vdev)
> +{
> + return (u32)SNET_QUEUE_ALIGNMENT;
> +}
> +
> +static int snet_reset_dev(struct snet *snet)
> +{
> + struct pci_dev *pdev = snet->pdev;
> + int ret = 0;
> + u32 i;
> +
> + /* If status is 0, nothing to do */
> + if (!snet->status)
> + return 0;
> +
> + /* If DPU started, send a destroy message */
> + if (snet->status & VIRTIO_CONFIG_S_DRIVER_OK)
> + ret = snet_send_msg(snet, SNET_MSG_DESTROY, true);
> +
> + /* Clear VQs */
> + for (i = 0; i < snet->cfg->vq_num; i++) {
> + if (!snet->vqs[i])
> + continue;
> + snet->vqs[i]->cb.callback = NULL;
> + snet->vqs[i]->cb.private = NULL;
> + snet->vqs[i]->desc_area = 0;
> + snet->vqs[i]->device_area = 0;
> + snet->vqs[i]->driver_area = 0;
> + snet->vqs[i]->ready = false;
> + }
> +
> + /* Clear config callback */
> + snet->cb.callback = NULL;
> + snet->cb.private = NULL;
> + /* Free IRQs */
> + snet_free_irqs(snet);
> + /* Reset status */
> + snet->status = 0;
> +
> + if (ret)
> + SNET_WARN(pdev, "Incomplete reset to SNET[%u] device\n", snet->sid);
> + else
> + SNET_DBG(pdev, "Reset SNET[%u] device\n", snet->sid);
> +
> + return 0;
> +}
> +
> +static int snet_reset(struct vdpa_device *vdev)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return snet_reset_dev(snet);
> +}
> +
> +static size_t snet_get_config_size(struct vdpa_device *vdev)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return (size_t)snet->cfg->cfg_size;
> +}
> +
> +static u64 snet_get_features(struct vdpa_device *vdev)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return snet->cfg->features;
> +}
> +
> +static int snet_set_drv_features(struct vdpa_device *vdev, u64 features)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + snet->negotiated_features = snet->cfg->features & features;
> + return 0;
> +}
> +
> +static u64 snet_get_drv_features(struct vdpa_device *vdev)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return snet->negotiated_features;
> +}
> +
> +static u16 snet_get_vq_num_max(struct vdpa_device *vdev)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return (u16)snet->cfg->vq_size;
> +}
> +
> +static void snet_set_config_cb(struct vdpa_device *vdev, struct vdpa_callback *cb)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + snet->cb.callback = cb->callback;
> + snet->cb.private = cb->private;
> +}
> +
> +static u32 snet_get_device_id(struct vdpa_device *vdev)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return snet->cfg->virtio_id;
> +}
> +
> +static u32 snet_get_vendor_id(struct vdpa_device *vdev)
> +{
> + return (u32)PCI_VENDOR_ID_SOLIDRUN;
> +}
> +
> +static u8 snet_get_status(struct vdpa_device *vdev)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> +
> + return snet->status;
> +}
> +
> +static int snet_write_conf(struct snet *snet)
> +{
> + u32 off, i, tmp;
> + int ret;
> +
> + /* No need to write the config twice */
> + if (snet->dpu_ready)
> + return true;
> +
> + /* Snet data :
> + *
> + * General data: SNET_GENERAL_CFG_LEN bytes long
> + * 0 0x4 0x8 0xC 0x10 0x14 0x1C 0x24
> + * | MAGIC NUMBER | CFG VER | SNET SID | NUMBER OF QUEUES | IRQ IDX | FEATURES | RSVD |
> + *
> + * For every VQ: SNET_GENERAL_CFG_VQ_LEN bytes long
> + * 0 0x4 0x8
> + * | VQ SID AND QUEUE SIZE | IRQ Index |
> + * | DESC AREA |
> + * | DEVICE AREA |
> + * | DRIVER AREA |
> + * | RESERVED |
> + *
> + * Magic number should be written last, this is the DPU indication that the data is ready
> + */
> +
> + /* Init offset */
> + off = snet->psnet->cfg.host_cfg_off;
> +
> + /* Ignore magic number for now */
> + off += 4;
> + snet_write32(snet, off, snet->psnet->negotiated_cfg_ver);
> + off += 4;
> + snet_write32(snet, off, snet->sid);
> + off += 4;
> + snet_write32(snet, off, snet->cfg->vq_num);
> + off += 4;
> + snet_write32(snet, off, snet->cfg_irq_idx);
> + off += 4;
> + snet_write64(snet, off, snet->negotiated_features);
> + off += 8;
> + /* Ignore reserved */
> + off += 8;
> + /* Write VQs */
> + for (i = 0 ; i < snet->cfg->vq_num ; i++) {
> + tmp = (i << 16) | (snet->vqs[i]->num & 0xFFFF);
> + snet_write32(snet, off, tmp);
> + off += 4;
> + snet_write32(snet, off, snet->vqs[i]->irq_idx);
> + off += 4;
> + snet_write64(snet, off, snet->vqs[i]->desc_area);
> + off += 8;
> + snet_write64(snet, off, snet->vqs[i]->device_area);
> + off += 8;
> + snet_write64(snet, off, snet->vqs[i]->driver_area);
> + off += 8;
> + /* Ignore reserved */
> + off += 8;
> + }
> +
> + /* Clear snet messages address for this device */
> + snet_write32(snet, snet->psnet->cfg.msg_off, 0);
> + /* Write magic number - data is ready */
> + snet_write32(snet, snet->psnet->cfg.host_cfg_off, SNET_SIGNATURE);
> +
> + /* The DPU will ACK the config by clearing the signature */
> + ret = readx_poll_timeout(ioread32, snet->bar + snet->psnet->cfg.host_cfg_off,
> + tmp, !tmp, 10, SNET_READ_CFG_TIMEOUT);
> + if (ret) {
> + SNET_ERR(snet->pdev, "Timeout waiting for the DPU to read the config\n");
> + return false;
> + }
> +
> + /* set DPU flag */
> + snet->dpu_ready = true;
> +
> + return true;
> +}
> +
> +static int snet_request_irqs(struct pci_dev *pdev, struct snet *snet)
> +{
> + int ret, i, irq;
> +
> + /* Request config IRQ */
> + irq = pci_irq_vector(pdev, snet->cfg_irq_idx);
> + ret = devm_request_irq(&pdev->dev, irq, snet_cfg_irq_hndlr, 0,
> + snet->cfg_irq_name, snet);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to request IRQ\n");
> + return ret;
> + }
> + snet->cfg_irq = irq;
> +
> + /* Request IRQ for every VQ */
> + for (i = 0; i < snet->cfg->vq_num; i++) {
> + irq = pci_irq_vector(pdev, snet->vqs[i]->irq_idx);
> + ret = devm_request_irq(&pdev->dev, irq, snet_vq_irq_hndlr, 0,
> + snet->vqs[i]->irq_name, snet->vqs[i]);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to request IRQ\n");
> + return ret;
> + }
> + snet->vqs[i]->irq = irq;
> + }
> + return 0;
> +}
> +
> +static void snet_set_status(struct vdpa_device *vdev, u8 status)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> + struct psnet *psnet = snet->psnet;
> + struct pci_dev *pdev = snet->pdev;
> + int ret;
> + bool pf_irqs;
> +
> + if (status == snet->status)
> + return;
> +
> + if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
> + !(snet->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
> + /* Request IRQs */
> + pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF);
> + ret = snet_request_irqs(pf_irqs ? pdev->physfn : pdev, snet);
> + if (ret)
> + goto set_err;
> +
> + /* Write config to the DPU */
> + if (snet_write_conf(snet)) {
> + SNET_INFO(pdev, "Create SNET[%u] device\n", snet->sid);
> + } else {
> + snet_free_irqs(snet);
> + goto set_err;
> + }
> + }
> +
> + /* Save the new status */
> + snet->status = status;
> + return;
> +
> +set_err:
> + snet->status |= VIRTIO_CONFIG_S_FAILED;
> +}
> +
> +static void snet_get_config(struct vdpa_device *vdev, unsigned int offset,
> + void *buf, unsigned int len)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> + void __iomem *cfg_ptr = snet->cfg->virtio_cfg + offset;
> + u8 *buf_ptr = buf;
> + u32 i;
> +
> + /* check for offset error */
> + if (offset + len > snet->cfg->cfg_size)
> + return;
> +
> + /* Write into buffer */
> + for (i = 0; i < len; i++)
> + *buf_ptr++ = ioread8(cfg_ptr + i);
> +}
> +
> +static void snet_set_config(struct vdpa_device *vdev, unsigned int offset,
> + const void *buf, unsigned int len)
> +{
> + struct snet *snet = vdpa_to_snet(vdev);
> + void __iomem *cfg_ptr = snet->cfg->virtio_cfg + offset;
> + const u8 *buf_ptr = buf;
> + u32 i;
> +
> + /* check for offset error */
> + if (offset + len > snet->cfg->cfg_size)
> + return;
> +
> + /* Write into PCI BAR */
> + for (i = 0; i < len; i++)
> + iowrite8(*buf_ptr++, cfg_ptr + i);
> +}
> +
> +static const struct vdpa_config_ops snet_config_ops = {
> + .set_vq_address = snet_set_vq_address,
> + .set_vq_num = snet_set_vq_num,
> + .kick_vq = snet_kick_vq,
> + .set_vq_cb = snet_set_vq_cb,
> + .set_vq_ready = snet_set_vq_ready,
> + .get_vq_ready = snet_get_vq_ready,
> + .set_vq_state = snet_set_vq_state,
> + .get_vq_state = snet_get_vq_state,
> + .get_vq_irq = snet_get_vq_irq,
> + .get_vq_align = snet_get_vq_align,
> + .reset = snet_reset,
> + .get_config_size = snet_get_config_size,
> + .get_device_features = snet_get_features,
> + .set_driver_features = snet_set_drv_features,
> + .get_driver_features = snet_get_drv_features,
> + .get_vq_num_min = snet_get_vq_num_max,
> + .get_vq_num_max = snet_get_vq_num_max,
> + .set_config_cb = snet_set_config_cb,
> + .get_device_id = snet_get_device_id,
> + .get_vendor_id = snet_get_vendor_id,
> + .get_status = snet_get_status,
> + .set_status = snet_set_status,
> + .get_config = snet_get_config,
> + .set_config = snet_set_config,
> +};
> +
> +static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet)
> +{
> + char name[25];
> + int ret, i, mask = 0;
> + /* We don't know which BAR will be used to communicate..
> + * We will map every bar with len > 0.
> + *
> + * Later, we will discover the BAR and unmap all other BARs.
> + */
> + for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> + if (pci_resource_len(pdev, i))
> + mask |= (1 << i);
> + }
> +
> + /* No BAR can be used.. */
> + if (!mask) {
> + SNET_ERR(pdev, "Failed to find a PCI BAR\n");
> + return -ENODEV;
> + }
> +
> + snprintf(name, SNET_NAME_SIZE, "psnet[%s]-bars", pci_name(pdev));
> + ret = pcim_iomap_regions(pdev, mask, name);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to request and map PCI BARs\n");
> + return ret;
> + }
> +
> + for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> + if (mask & (1 << i))
> + psnet->bars[i] = pcim_iomap_table(pdev)[i];
> + }
> +
> + return 0;
> +}
> +
> +static int snet_open_vf_bar(struct pci_dev *pdev, struct snet *snet)
> +{
> + char name[20];
> + int ret;
> +
> + snprintf(name, SNET_NAME_SIZE, "snet[%s]-bar", pci_name(pdev));
> + /* Request and map BAR */
> + ret = pcim_iomap_regions(pdev, BIT(snet->psnet->cfg.vf_bar), name);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to request and map PCI BAR for a VF\n");
> + return ret;
> + }
> +
> + snet->bar = pcim_iomap_table(pdev)[snet->psnet->cfg.vf_bar];
> +
> + return 0;
> +}
> +
> +static void snet_free_cfg(struct snet_cfg *cfg)
> +{
> + u32 i;
> +
> + if (!cfg->devs)
> + return;
> +
> + /* Free devices */
> + for (i = 0; i < cfg->devices_num; i++) {
> + if (!cfg->devs[i])
> + break;
> +
> + kfree(cfg->devs[i]);
> + }
> + /* Free pointers to devices */
> + kfree(cfg->devs);
> +}
> +
> +/* Detect which BAR is used for communication with the device. */
> +static int psnet_detect_bar(struct psnet *psnet, u32 off)
> +{
> + unsigned long exit_time;
> + int i;
> +
> + exit_time = jiffies + usecs_to_jiffies(SNET_DETECT_TIMEOUT);
> +
> + /* SNET DPU will write SNET's signature when the config is ready. */
> + while (time_before(jiffies, exit_time)) {
> + for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> + /* Is this BAR mapped? */
> + if (!psnet->bars[i])
> + continue;
> +
> + if (ioread32(psnet->bars[i] + off) == SNET_SIGNATURE)
> + return i;
> + }
> + usleep_range(1000, 10000);
> + }
> +
> + return -ENODEV;
> +}
> +
> +static void psnet_unmap_unused_bars(struct pci_dev *pdev, struct psnet *psnet)
> +{
> + int i, mask = 0;
> +
> + for (i = 0; i < PCI_STD_NUM_BARS; i++) {
> + if (psnet->bars[i] && i != psnet->barno)
> + mask |= (1 << i);
> + }
> +
> + if (mask)
> + pcim_iounmap_regions(pdev, mask);
> +}
> +
> +/* Read SNET config from PCI BAR */
> +static int psnet_read_cfg(struct pci_dev *pdev, struct psnet *psnet)
> +{
> + struct snet_cfg *cfg = &psnet->cfg;
> + u32 i, off;
> + int barno;
> +
> + /* Move to where the config starts */
> + off = SNET_CONFIG_OFF;
> +
> + /* Find BAR used for communication */
> + barno = psnet_detect_bar(psnet, off);
> + if (barno < 0) {
> + SNET_ERR(pdev, "SNET config is not ready.\n");
> + return barno;
> + }
> +
> + /* Save used BAR number and unmap all other BARs */
> + psnet->barno = barno;
> + SNET_DBG(pdev, "Using BAR number %d\n", barno);
> +
> + psnet_unmap_unused_bars(pdev, psnet);
> +
> + /* load config from BAR */
> + cfg->key = psnet_read32(psnet, off);
> + off += 4;
> + cfg->cfg_size = psnet_read32(psnet, off);
> + off += 4;
> + cfg->cfg_ver = psnet_read32(psnet, off);
> + off += 4;
> + /* The negotiated config version is the lower one between this driver's config
> + * and the DPU's.
> + */
> + psnet->negotiated_cfg_ver = min_t(u32, cfg->cfg_ver, SNET_CFG_VERSION);
> + SNET_DBG(pdev, "SNET config version %u\n", psnet->negotiated_cfg_ver);
> +
> + cfg->vf_num = psnet_read32(psnet, off);
> + off += 4;
> + cfg->vf_bar = psnet_read32(psnet, off);
> + off += 4;
> + cfg->host_cfg_off = psnet_read32(psnet, off);
> + off += 4;
> + cfg->max_size_host_cfg = psnet_read32(psnet, off);
> + off += 4;
> + cfg->virtio_cfg_off = psnet_read32(psnet, off);
> + off += 4;
> + cfg->kick_off = psnet_read32(psnet, off);
> + off += 4;
> + cfg->hwmon_off = psnet_read32(psnet, off);
> + off += 4;
> + cfg->msg_off = psnet_read32(psnet, off);
> + off += 4;
> + cfg->flags = psnet_read32(psnet, off);
> + off += 4;
> + /* Ignore Reserved */
> + off += sizeof(cfg->rsvd);
> +
> + cfg->devices_num = psnet_read32(psnet, off);
> + off += 4;
> + /* Allocate memory to hold pointer to the devices */
> + cfg->devs = kcalloc(cfg->devices_num, sizeof(void *), GFP_KERNEL);
> + if (!cfg->devs)
> + return -ENOMEM;
> +
> + /* Load device configuration from BAR */
> + for (i = 0; i < cfg->devices_num; i++) {
> + cfg->devs[i] = kzalloc(sizeof(*cfg->devs[i]), GFP_KERNEL);
> + if (!cfg->devs[i]) {
> + snet_free_cfg(cfg);
> + return -ENOMEM;
> + }
> + /* Read device config */
> + cfg->devs[i]->virtio_id = psnet_read32(psnet, off);
> + off += 4;
> + cfg->devs[i]->vq_num = psnet_read32(psnet, off);
> + off += 4;
> + cfg->devs[i]->vq_size = psnet_read32(psnet, off);
> + off += 4;
> + cfg->devs[i]->vfid = psnet_read32(psnet, off);
> + off += 4;
> + cfg->devs[i]->features = psnet_read64(psnet, off);
> + off += 8;
> + /* Ignore Reserved */
> + off += sizeof(cfg->devs[i]->rsvd);
> +
> + cfg->devs[i]->cfg_size = psnet_read32(psnet, off);
> + off += 4;
> +
> + /* Is the config witten to the DPU going to be too big? */
> + if (SNET_GENERAL_CFG_LEN + SNET_GENERAL_CFG_VQ_LEN * cfg->devs[i]->vq_num >
> + cfg->max_size_host_cfg) {
> + SNET_ERR(pdev, "Failed to read SNET config, the config is too big..\n");
> + snet_free_cfg(cfg);
> + return -EINVAL;
> + }
> + }
> + return 0;
> +}
> +
> +static int psnet_alloc_irq_vector(struct pci_dev *pdev, struct psnet *psnet)
> +{
> + int ret = 0;
> + u32 i, irq_num = 0;
> +
> + /* Let's count how many IRQs we need, 1 for every VQ + 1 for config change */
> + for (i = 0; i < psnet->cfg.devices_num; i++)
> + irq_num += psnet->cfg.devs[i]->vq_num + 1;
> +
> + ret = pci_alloc_irq_vectors(pdev, irq_num, irq_num, PCI_IRQ_MSIX);
> + if (ret != irq_num) {
> + SNET_ERR(pdev, "Failed to allocate IRQ vectors\n");
> + return ret;
> + }
> + SNET_DBG(pdev, "Allocated %u IRQ vectors from physical function\n", irq_num);
> +
> + return 0;
> +}
> +
> +static int snet_alloc_irq_vector(struct pci_dev *pdev, struct snet_dev_cfg *snet_cfg)
> +{
> + int ret = 0;
> + u32 irq_num;
> +
> + /* We want 1 IRQ for every VQ + 1 for config change events */
> + irq_num = snet_cfg->vq_num + 1;
> +
> + ret = pci_alloc_irq_vectors(pdev, irq_num, irq_num, PCI_IRQ_MSIX);
> + if (ret <= 0) {
> + SNET_ERR(pdev, "Failed to allocate IRQ vectors\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void snet_free_vqs(struct snet *snet)
> +{
> + u32 i;
> +
> + if (!snet->vqs)
> + return;
> +
> + for (i = 0 ; i < snet->cfg->vq_num ; i++) {
> + if (!snet->vqs[i])
> + break;
> +
> + kfree(snet->vqs[i]);
> + }
> + kfree(snet->vqs);
> +}
> +
> +static int snet_build_vqs(struct snet *snet)
> +{
> + u32 i;
> + /* Allocate the VQ pointers array */
> + snet->vqs = kcalloc(snet->cfg->vq_num, sizeof(void *), GFP_KERNEL);
> + if (!snet->vqs)
> + return -ENOMEM;
> +
> + /* Allocate the VQs */
> + for (i = 0; i < snet->cfg->vq_num; i++) {
> + snet->vqs[i] = kzalloc(sizeof(*snet->vqs[i]), GFP_KERNEL);
> + if (!snet->vqs[i]) {
> + snet_free_vqs(snet);
> + return -ENOMEM;
> + }
> + /* Reset IRQ num */
> + snet->vqs[i]->irq = -1;
> + /* VQ serial ID */
> + snet->vqs[i]->sid = i;
> + /* Kick address - every VQ gets 4B */
> + snet->vqs[i]->kick_ptr = snet->bar + snet->psnet->cfg.kick_off +
> + snet->vqs[i]->sid * 4;
> + /* Clear kick address for this VQ */
> + iowrite32(0, snet->vqs[i]->kick_ptr);
> + }
> + return 0;
> +}
> +
> +static int psnet_get_next_irq_num(struct psnet *psnet)
> +{
> + int irq;
> +
> + spin_lock(&psnet->lock);
> + irq = psnet->next_irq++;
> + spin_unlock(&psnet->lock);
> +
> + return irq;
> +}
> +
> +static void snet_reserve_irq_idx(struct pci_dev *pdev, struct snet *snet)
> +{
> + struct psnet *psnet = snet->psnet;
> + int i;
> +
> + /* one IRQ for every VQ, and one for config changes */
> + snet->cfg_irq_idx = psnet_get_next_irq_num(psnet);
> + snprintf(snet->cfg_irq_name, SNET_NAME_SIZE, "snet[%s]-cfg[%d]",
> + pci_name(pdev), snet->cfg_irq_idx);
> +
> + for (i = 0; i < snet->cfg->vq_num; i++) {
> + /* Get next free IRQ ID */
> + snet->vqs[i]->irq_idx = psnet_get_next_irq_num(psnet);
> + /* Write IRQ name */
> + snprintf(snet->vqs[i]->irq_name, SNET_NAME_SIZE, "snet[%s]-vq[%d]",
> + pci_name(pdev), snet->vqs[i]->irq_idx);
> + }
> +}
> +
> +/* Find a device config based on virtual function id */
> +static struct snet_dev_cfg *snet_find_dev_cfg(struct snet_cfg *cfg, u32 vfid)
> +{
> + u32 i;
> +
> + for (i = 0; i < cfg->devices_num; i++) {
> + if (cfg->devs[i]->vfid == vfid)
> + return cfg->devs[i];
> + }
> + /* Oppss.. no config found.. */
> + return NULL;
> +}
> +
> +/* Probe function for a physical PCI function */
> +static int snet_vdpa_probe_pf(struct pci_dev *pdev)
> +{
> + struct psnet *psnet;
> + int ret = 0;
> + bool pf_irqs = false;
> +
> + ret = pcim_enable_device(pdev);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to enable PCI device\n");
> + return ret;
> + }
> +
> + /* Allocate a PCI physical function device */
> + psnet = kzalloc(sizeof(*psnet), GFP_KERNEL);
> + if (!psnet)
> + return -ENOMEM;
> +
> + /* Init PSNET spinlock */
> + spin_lock_init(&psnet->lock);
> +
> + pci_set_master(pdev);
> + pci_set_drvdata(pdev, psnet);
> +
> + /* Open SNET MAIN BAR */
> + ret = psnet_open_pf_bar(pdev, psnet);
> + if (ret)
> + goto free_psnet;
> +
> + /* Try to read SNET's config from PCI BAR */
> + ret = psnet_read_cfg(pdev, psnet);
> + if (ret)
> + goto free_psnet;
> +
> + /* If SNET_CFG_FLAG_IRQ_PF flag is set, we should use
> + * PF MSI-X vectors
> + */
> + pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF);
> +
> + if (pf_irqs) {
> + ret = psnet_alloc_irq_vector(pdev, psnet);
> + if (ret)
> + goto free_cfg;
> + }
> +
> + SNET_DBG(pdev, "Enable %u virtual functions\n", psnet->cfg.vf_num);
> + ret = pci_enable_sriov(pdev, psnet->cfg.vf_num);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to enable SR-IOV\n");
> + goto free_irq;
> + }
> +
> + /* Create HW monitor device */
> + if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_HWMON)) {
> +#if IS_ENABLED(CONFIG_HWMON)
> + psnet_create_hwmon(pdev);
> +#else
> + SNET_WARN(pdev, "Can't start HWMON, CONFIG_HWMON is not enabled\n");
> +#endif
> + }
> +
> + return 0;
> +
> +free_irq:
> + if (pf_irqs)
> + pci_free_irq_vectors(pdev);
> +free_cfg:
> + snet_free_cfg(&psnet->cfg);
> +free_psnet:
> + kfree(psnet);
> + return ret;
> +}
> +
> +/* Probe function for a virtual PCI function */
> +static int snet_vdpa_probe_vf(struct pci_dev *pdev)
> +{
> + struct pci_dev *pdev_pf = pdev->physfn;
> + struct psnet *psnet = pci_get_drvdata(pdev_pf);
> + struct snet_dev_cfg *dev_cfg;
> + struct snet *snet;
> + u32 vfid;
> + int ret;
> + bool pf_irqs = false;
> +
> + /* Get virtual function id.
> + * (the DPU counts the VFs from 1)
> + */
> + ret = pci_iov_vf_id(pdev);
> + if (ret < 0) {
> + SNET_ERR(pdev, "Failed to find a VF id\n");
> + return ret;
> + }
> + vfid = ret + 1;
> +
> + /* Find the snet_dev_cfg based on vfid */
> + dev_cfg = snet_find_dev_cfg(&psnet->cfg, vfid);
> + if (!dev_cfg) {
> + SNET_WARN(pdev, "Failed to find a VF config..\n");
> + return -ENODEV;
> + }
> +
> + /* Which PCI device should allocate the IRQs?
> + * If the SNET_CFG_FLAG_IRQ_PF flag set, the PF device allocates the IRQs
> + */
> + pf_irqs = PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF);
> +
> + ret = pcim_enable_device(pdev);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to enable PCI VF device\n");
> + return ret;
> + }
> +
> + /* Request for MSI-X IRQs */
> + if (!pf_irqs) {
> + ret = snet_alloc_irq_vector(pdev, dev_cfg);
> + if (ret)
> + return ret;
> + }
> +
> + /* Allocate vdpa device */
> + snet = vdpa_alloc_device(struct snet, vdpa, &pdev->dev, &snet_config_ops, 1, 1, NULL,
> + false);
> + if (!snet) {
> + SNET_ERR(pdev, "Failed to allocate a vdpa device\n");
> + ret = -ENOMEM;
> + goto free_irqs;
> + }
> +
> + /* Save pci device pointer */
> + snet->pdev = pdev;
> + snet->psnet = psnet;
> + snet->cfg = dev_cfg;
> + snet->dpu_ready = false;
> + snet->sid = vfid;
> + /* Reset IRQ value */
> + snet->cfg_irq = -1;
> +
> + ret = snet_open_vf_bar(pdev, snet);
> + if (ret)
> + goto put_device;
> +
> + /* Create a VirtIO config pointer */
> + snet->cfg->virtio_cfg = snet->bar + snet->psnet->cfg.virtio_cfg_off;
> +
> + pci_set_master(pdev);
> + pci_set_drvdata(pdev, snet);
> +
> + ret = snet_build_vqs(snet);
> + if (ret)
> + goto put_device;
> +
> + /* Reserve IRQ indexes,
> + * The IRQs may be requested and freed multiple times,
> + * but the indexes won't change.
> + */
> + snet_reserve_irq_idx(pf_irqs ? pdev_pf : pdev, snet);
> +
> + /*set DMA device*/
> + snet->vdpa.dma_dev = &pdev->dev;
> +
> + /* Register VDPA device */
> + ret = vdpa_register_device(&snet->vdpa, snet->cfg->vq_num);
> + if (ret) {
> + SNET_ERR(pdev, "Failed to register vdpa device\n");
> + goto free_vqs;
> + }
> +
> + return 0;
> +
> +free_vqs:
> + snet_free_vqs(snet);
> +put_device:
> + put_device(&snet->vdpa.dev);
> +free_irqs:
> + if (!pf_irqs)
> + pci_free_irq_vectors(pdev);
> + return ret;
> +}
> +
> +static int snet_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> +{
> + if (pdev->is_virtfn)
> + return snet_vdpa_probe_vf(pdev);
> + else
> + return snet_vdpa_probe_pf(pdev);
> +}
> +
> +static void snet_vdpa_remove_pf(struct pci_dev *pdev)
> +{
> + struct psnet *psnet = pci_get_drvdata(pdev);
> +
> + pci_disable_sriov(pdev);
> + /* If IRQs are allocated from the PF, we should free the IRQs */
> + if (PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF))
> + pci_free_irq_vectors(pdev);
> +
> + snet_free_cfg(&psnet->cfg);
> + kfree(psnet);
> +}
> +
> +static void snet_vdpa_remove_vf(struct pci_dev *pdev)
> +{
> + struct snet *snet = pci_get_drvdata(pdev);
> + struct psnet *psnet = snet->psnet;
> +
> + /* If IRQs are allocated from the VF, we should free the IRQs */
> + if (!PSNET_FLAG_ON(psnet, SNET_CFG_FLAG_IRQ_PF))
> + pci_free_irq_vectors(pdev);
> +
> + vdpa_unregister_device(&snet->vdpa);
> + snet_free_vqs(snet);
> +}
> +
> +static void snet_vdpa_remove(struct pci_dev *pdev)
> +{
> + if (pdev->is_virtfn)
> + snet_vdpa_remove_vf(pdev);
> + else
> + snet_vdpa_remove_pf(pdev);
> +}
> +
> +static struct pci_device_id snet_driver_pci_ids[] = {
> + { PCI_DEVICE_SUB(PCI_VENDOR_ID_SOLIDRUN, SNET_DEVICE_ID,
> + PCI_VENDOR_ID_SOLIDRUN, SNET_DEVICE_ID) },
> + { 0 },
> +};
> +
> +MODULE_DEVICE_TABLE(pci, snet_driver_pci_ids);
> +
> +static struct pci_driver snet_vdpa_driver = {
> + .name = "snet-vdpa-driver",
> + .id_table = snet_driver_pci_ids,
> + .probe = snet_vdpa_probe,
> + .remove = snet_vdpa_remove,
> +};
> +
> +module_pci_driver(snet_vdpa_driver);
> +
> +MODULE_AUTHOR("Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("SolidRun vDPA driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/vdpa/solidrun/snet_vdpa.h b/drivers/vdpa/solidrun/snet_vdpa.h
> new file mode 100644
> index 00000000000..3ebfb7deec4
> --- /dev/null
> +++ b/drivers/vdpa/solidrun/snet_vdpa.h
> @@ -0,0 +1,196 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * SolidRun DPU driver for control plane
> + *
> + * Copyright (C) 2022 SolidRun
> + *
> + * Author: Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>
> + *
> + */
> +#ifndef _SNET_VDPA_H_
> +#define _SNET_VDPA_H_
> +
> +#include <linux/vdpa.h>
> +#include <linux/pci.h>
> +
> +#define SNET_NAME_SIZE 256
> +
> +#define SNET_ERR(pdev, fmt, ...) dev_err(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
> +#define SNET_WARN(pdev, fmt, ...) dev_warn(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
> +#define SNET_INFO(pdev, fmt, ...) dev_info(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
> +#define SNET_DBG(pdev, fmt, ...) dev_dbg(&(pdev)->dev, "%s"fmt, "snet_vdpa: ", ##__VA_ARGS__)
> +#define SNET_HAS_FEATURE(s, f) ((s)->negotiated_features & BIT_ULL(f))
> +/* VQ struct */
> +struct snet_vq {
> + /* VQ callback */
> + struct vdpa_callback cb;
> + /* desc base address */
> + u64 desc_area;
> + /* device base address */
> + u64 device_area;
> + /* driver base address */
> + u64 driver_area;
> + /* Queue size */
> + u32 num;
> + /* Serial ID for VQ */
> + u32 sid;
> + /* is ready flag */
> + bool ready;
> + /* IRQ number */
> + u32 irq;
> + /* IRQ index, DPU uses this to parse data from MSI-X table */
> + u32 irq_idx;
> + /* IRQ name */
> + char irq_name[SNET_NAME_SIZE];
> + /* pointer to mapped PCI BAR register used by this VQ to kick */
> + void __iomem *kick_ptr;
> +};
> +
> +struct snet {
> + /* vdpa device */
> + struct vdpa_device vdpa;
> + /* Config callback */
> + struct vdpa_callback cb;
> + /* array of virqueues */
> + struct snet_vq **vqs;
> + /* Used features */
> + u64 negotiated_features;
> + /* Device serial ID */
> + u32 sid;
> + /* device status */
> + u8 status;
> + /* boolean indicating if snet config was passed to the device */
> + bool dpu_ready;
> + /* IRQ number */
> + u32 cfg_irq;
> + /* IRQ index, DPU uses this to parse data from MSI-X table */
> + u32 cfg_irq_idx;
> + /* IRQ name */
> + char cfg_irq_name[SNET_NAME_SIZE];
> + /* BAR to access the VF */
> + void __iomem *bar;
> + /* PCI device */
> + struct pci_dev *pdev;
> + /* Pointer to snet pdev parent device */
> + struct psnet *psnet;
> + /* Pointer to snet config device */
> + struct snet_dev_cfg *cfg;
> +};
> +
> +struct snet_dev_cfg {
> + /* Device ID following VirtIO spec. */
> + u32 virtio_id;
> + /* Number of VQs for this device */
> + u32 vq_num;
> + /* Size of every VQ */
> + u32 vq_size;
> + /* Virtual Function id */
> + u32 vfid;
> + /* Device features, following VirtIO spec */
> + u64 features;
> + /* Reserved for future usage */
> + u32 rsvd[6];
> + /* VirtIO device specific config size */
> + u32 cfg_size;
> + /* VirtIO device specific config address */
> + void __iomem *virtio_cfg;
> +} __packed;
> +
> +struct snet_cfg {
> + /* Magic key */
> + u32 key;
> + /* Size of total config in bytes */
> + u32 cfg_size;
> + /* Config version */
> + u32 cfg_ver;
> + /* Number of Virtual Functions to create */
> + u32 vf_num;
> + /* BAR to use for the VFs */
> + u32 vf_bar;
> + /* Where should we write the SNET's config */
> + u32 host_cfg_off;
> + /* Max. allowed size for a SNET's config */
> + u32 max_size_host_cfg;
> + /* VirtIO config offset in BAR */
> + u32 virtio_cfg_off;
> + /* Offset in PCI BAR for VQ kicks */
> + u32 kick_off;
> + /* Offset in PCI BAR for HW monitoring */
> + u32 hwmon_off;
> + /* Offset in PCI BAR for SNET messages */
> + u32 msg_off;
> + /* Config general flags - enum snet_cfg_flags */
> + u32 flags;
> + /* Reserved for future usage */
> + u32 rsvd[6];
> + /* Number of snet devices */
> + u32 devices_num;
> + /* The actual devices */
> + struct snet_dev_cfg **devs;
> +} __packed;
> +
> +/* SolidNET PCIe device, one device per PCIe physical function */
> +struct psnet {
> + /* PCI BARs */
> + void __iomem *bars[PCI_STD_NUM_BARS];
> + /* Negotiated config version */
> + u32 negotiated_cfg_ver;
> + /* Next IRQ index to use in case when the IRQs are allocated from this device */
> + u32 next_irq;
> + /* BAR number used to communicate with the device */
> + u8 barno;
> + /* spinlock to protect data that can be changed by SNET devices */
> + spinlock_t lock;
> + /* Pointer to the device's config read from BAR */
> + struct snet_cfg cfg;
> + /* Name of monitor device */
> + char hwmon_name[SNET_NAME_SIZE];
> +};
> +
> +enum snet_cfg_flags {
> + /* Create a HWMON device */
> + SNET_CFG_FLAG_HWMON = BIT(0),
> + /* USE IRQs from the physical function */
> + SNET_CFG_FLAG_IRQ_PF = BIT(1),
> +};
> +
> +#define PSNET_FLAG_ON(p, f) ((p)->cfg.flags & (f))
> +
> +static inline u32 psnet_read32(struct psnet *psnet, u32 off)
> +{
> + return ioread32(psnet->bars[psnet->barno] + off);
> +}
> +
> +static inline u32 snet_read32(struct snet *snet, u32 off)
> +{
> + return ioread32(snet->bar + off);
> +}
> +
> +static inline void snet_write32(struct snet *snet, u32 off, u32 val)
> +{
> + iowrite32(val, snet->bar + off);
> +}
> +
> +static inline u64 psnet_read64(struct psnet *psnet, u32 off)
> +{
> + u64 val;
> + /* 64bits are written in 2 halves, low part first */
> + val = (u64)psnet_read32(psnet, off);
> + val |= ((u64)psnet_read32(psnet, off + 4) << 32);
> + return val;
> +}
> +
> +static inline void snet_write64(struct snet *snet, u32 off, u64 val)
> +{
> + /* The DPU expects a 64bit integer in 2 halves, the low part first */
> + snet_write32(snet, off, (u32)val);
> + snet_write32(snet, off + 4, (u32)(val >> 32));
> +}
> +
> +#if IS_ENABLED(CONFIG_HWMON)
> +void psnet_create_hwmon(struct pci_dev *pdev);
> +#else
> +void psnet_create_hwmon(struct pci_dev *pdev) {}
> +#endif
> +
> +#endif //_SNET_VDPA_H_
> --
> 2.32.0
>
>
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