diff options
Diffstat (limited to 'drivers/scsi/snic/vnic_dev.c')
| -rw-r--r-- | drivers/scsi/snic/vnic_dev.c | 763 |
1 files changed, 763 insertions, 0 deletions
diff --git a/drivers/scsi/snic/vnic_dev.c b/drivers/scsi/snic/vnic_dev.c new file mode 100644 index 000000000..05e374f80 --- /dev/null +++ b/drivers/scsi/snic/vnic_dev.c @@ -0,0 +1,763 @@ +/* + * Copyright 2014 Cisco Systems, Inc. All rights reserved. + * + * This program is free software; you may redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/if_ether.h> +#include <linux/slab.h> +#include "vnic_resource.h" +#include "vnic_devcmd.h" +#include "vnic_dev.h" +#include "vnic_stats.h" +#include "vnic_wq.h" + +#define VNIC_DVCMD_TMO 10000 /* Devcmd Timeout value */ +#define VNIC_NOTIFY_INTR_MASK 0x0000ffff00000000ULL + +struct devcmd2_controller { + struct vnic_wq_ctrl __iomem *wq_ctrl; + struct vnic_dev_ring results_ring; + struct vnic_wq wq; + struct vnic_devcmd2 *cmd_ring; + struct devcmd2_result *result; + u16 next_result; + u16 result_size; + int color; +}; + +struct vnic_res { + void __iomem *vaddr; + unsigned int count; +}; + +struct vnic_dev { + void *priv; + struct pci_dev *pdev; + struct vnic_res res[RES_TYPE_MAX]; + enum vnic_dev_intr_mode intr_mode; + struct vnic_devcmd __iomem *devcmd; + struct vnic_devcmd_notify *notify; + struct vnic_devcmd_notify notify_copy; + dma_addr_t notify_pa; + u32 *linkstatus; + dma_addr_t linkstatus_pa; + struct vnic_stats *stats; + dma_addr_t stats_pa; + struct vnic_devcmd_fw_info *fw_info; + dma_addr_t fw_info_pa; + u64 args[VNIC_DEVCMD_NARGS]; + struct devcmd2_controller *devcmd2; + + int (*devcmd_rtn)(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd, + int wait); +}; + +#define VNIC_MAX_RES_HDR_SIZE \ + (sizeof(struct vnic_resource_header) + \ + sizeof(struct vnic_resource) * RES_TYPE_MAX) +#define VNIC_RES_STRIDE 128 + +void *svnic_dev_priv(struct vnic_dev *vdev) +{ + return vdev->priv; +} + +static int vnic_dev_discover_res(struct vnic_dev *vdev, + struct vnic_dev_bar *bar, unsigned int num_bars) +{ + struct vnic_resource_header __iomem *rh; + struct vnic_resource __iomem *r; + u8 type; + + if (num_bars == 0) + return -EINVAL; + + if (bar->len < VNIC_MAX_RES_HDR_SIZE) { + pr_err("vNIC BAR0 res hdr length error\n"); + + return -EINVAL; + } + + rh = bar->vaddr; + if (!rh) { + pr_err("vNIC BAR0 res hdr not mem-mapped\n"); + + return -EINVAL; + } + + if (ioread32(&rh->magic) != VNIC_RES_MAGIC || + ioread32(&rh->version) != VNIC_RES_VERSION) { + pr_err("vNIC BAR0 res magic/version error exp (%lx/%lx) curr (%x/%x)\n", + VNIC_RES_MAGIC, VNIC_RES_VERSION, + ioread32(&rh->magic), ioread32(&rh->version)); + + return -EINVAL; + } + + r = (struct vnic_resource __iomem *)(rh + 1); + + while ((type = ioread8(&r->type)) != RES_TYPE_EOL) { + + u8 bar_num = ioread8(&r->bar); + u32 bar_offset = ioread32(&r->bar_offset); + u32 count = ioread32(&r->count); + u32 len; + + r++; + + if (bar_num >= num_bars) + continue; + + if (!bar[bar_num].len || !bar[bar_num].vaddr) + continue; + + switch (type) { + case RES_TYPE_WQ: + case RES_TYPE_RQ: + case RES_TYPE_CQ: + case RES_TYPE_INTR_CTRL: + /* each count is stride bytes long */ + len = count * VNIC_RES_STRIDE; + if (len + bar_offset > bar->len) { + pr_err("vNIC BAR0 resource %d out-of-bounds, offset 0x%x + size 0x%x > bar len 0x%lx\n", + type, bar_offset, + len, + bar->len); + + return -EINVAL; + } + break; + + case RES_TYPE_INTR_PBA_LEGACY: + case RES_TYPE_DEVCMD: + case RES_TYPE_DEVCMD2: + len = count; + break; + + default: + continue; + } + + vdev->res[type].count = count; + vdev->res[type].vaddr = (char __iomem *)bar->vaddr + bar_offset; + } + + return 0; +} + +unsigned int svnic_dev_get_res_count(struct vnic_dev *vdev, + enum vnic_res_type type) +{ + return vdev->res[type].count; +} + +void __iomem *svnic_dev_get_res(struct vnic_dev *vdev, enum vnic_res_type type, + unsigned int index) +{ + if (!vdev->res[type].vaddr) + return NULL; + + switch (type) { + case RES_TYPE_WQ: + case RES_TYPE_RQ: + case RES_TYPE_CQ: + case RES_TYPE_INTR_CTRL: + return (char __iomem *)vdev->res[type].vaddr + + index * VNIC_RES_STRIDE; + + default: + return (char __iomem *)vdev->res[type].vaddr; + } +} + +unsigned int svnic_dev_desc_ring_size(struct vnic_dev_ring *ring, + unsigned int desc_count, + unsigned int desc_size) +{ + /* The base address of the desc rings must be 512 byte aligned. + * Descriptor count is aligned to groups of 32 descriptors. A + * count of 0 means the maximum 4096 descriptors. Descriptor + * size is aligned to 16 bytes. + */ + + unsigned int count_align = 32; + unsigned int desc_align = 16; + + ring->base_align = 512; + + if (desc_count == 0) + desc_count = 4096; + + ring->desc_count = ALIGN(desc_count, count_align); + + ring->desc_size = ALIGN(desc_size, desc_align); + + ring->size = ring->desc_count * ring->desc_size; + ring->size_unaligned = ring->size + ring->base_align; + + return ring->size_unaligned; +} + +void svnic_dev_clear_desc_ring(struct vnic_dev_ring *ring) +{ + memset(ring->descs, 0, ring->size); +} + +int svnic_dev_alloc_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring, + unsigned int desc_count, unsigned int desc_size) +{ + svnic_dev_desc_ring_size(ring, desc_count, desc_size); + + ring->descs_unaligned = dma_alloc_coherent(&vdev->pdev->dev, + ring->size_unaligned, &ring->base_addr_unaligned, + GFP_KERNEL); + if (!ring->descs_unaligned) { + pr_err("Failed to allocate ring (size=%d), aborting\n", + (int)ring->size); + + return -ENOMEM; + } + + ring->base_addr = ALIGN(ring->base_addr_unaligned, + ring->base_align); + ring->descs = (u8 *)ring->descs_unaligned + + (ring->base_addr - ring->base_addr_unaligned); + + svnic_dev_clear_desc_ring(ring); + + ring->desc_avail = ring->desc_count - 1; + + return 0; +} + +void svnic_dev_free_desc_ring(struct vnic_dev *vdev, struct vnic_dev_ring *ring) +{ + if (ring->descs) { + dma_free_coherent(&vdev->pdev->dev, + ring->size_unaligned, + ring->descs_unaligned, + ring->base_addr_unaligned); + ring->descs = NULL; + } +} + +static int _svnic_dev_cmd2(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd, + int wait) +{ + struct devcmd2_controller *dc2c = vdev->devcmd2; + struct devcmd2_result *result = NULL; + unsigned int i; + int delay; + int err; + u32 posted; + u32 fetch_idx; + u32 new_posted; + u8 color; + + fetch_idx = ioread32(&dc2c->wq_ctrl->fetch_index); + if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone */ + /* Hardware surprise removal: return error */ + return -ENODEV; + } + + posted = ioread32(&dc2c->wq_ctrl->posted_index); + + if (posted == 0xFFFFFFFF) { /* check for hardware gone */ + /* Hardware surprise removal: return error */ + return -ENODEV; + } + + new_posted = (posted + 1) % DEVCMD2_RING_SIZE; + if (new_posted == fetch_idx) { + pr_err("%s: wq is full while issuing devcmd2 command %d, fetch index: %u, posted index: %u\n", + pci_name(vdev->pdev), _CMD_N(cmd), fetch_idx, posted); + + return -EBUSY; + } + + dc2c->cmd_ring[posted].cmd = cmd; + dc2c->cmd_ring[posted].flags = 0; + + if ((_CMD_FLAGS(cmd) & _CMD_FLAGS_NOWAIT)) + dc2c->cmd_ring[posted].flags |= DEVCMD2_FNORESULT; + + if (_CMD_DIR(cmd) & _CMD_DIR_WRITE) { + for (i = 0; i < VNIC_DEVCMD_NARGS; i++) + dc2c->cmd_ring[posted].args[i] = vdev->args[i]; + } + /* Adding write memory barrier prevents compiler and/or CPU + * reordering, thus avoiding descriptor posting before + * descriptor is initialized. Otherwise, hardware can read + * stale descriptor fields. + */ + wmb(); + iowrite32(new_posted, &dc2c->wq_ctrl->posted_index); + + if (dc2c->cmd_ring[posted].flags & DEVCMD2_FNORESULT) + return 0; + + result = dc2c->result + dc2c->next_result; + color = dc2c->color; + + /* + * Increment next_result, after posting the devcmd, irrespective of + * devcmd result, and it should be done only once. + */ + dc2c->next_result++; + if (dc2c->next_result == dc2c->result_size) { + dc2c->next_result = 0; + dc2c->color = dc2c->color ? 0 : 1; + } + + for (delay = 0; delay < wait; delay++) { + udelay(100); + if (result->color == color) { + if (result->error) { + err = (int) result->error; + if (err != ERR_ECMDUNKNOWN || + cmd != CMD_CAPABILITY) + pr_err("Error %d devcmd %d\n", + err, _CMD_N(cmd)); + + return err; + } + if (_CMD_DIR(cmd) & _CMD_DIR_READ) { + for (i = 0; i < VNIC_DEVCMD_NARGS; i++) + vdev->args[i] = result->results[i]; + } + + return 0; + } + } + + pr_err("Timed out devcmd %d\n", _CMD_N(cmd)); + + return -ETIMEDOUT; +} + +static int svnic_dev_init_devcmd2(struct vnic_dev *vdev) +{ + struct devcmd2_controller *dc2c = NULL; + unsigned int fetch_idx; + int ret; + void __iomem *p; + + if (vdev->devcmd2) + return 0; + + p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0); + if (!p) + return -ENODEV; + + dc2c = kzalloc(sizeof(*dc2c), GFP_ATOMIC); + if (!dc2c) + return -ENOMEM; + + vdev->devcmd2 = dc2c; + + dc2c->color = 1; + dc2c->result_size = DEVCMD2_RING_SIZE; + + ret = vnic_wq_devcmd2_alloc(vdev, + &dc2c->wq, + DEVCMD2_RING_SIZE, + DEVCMD2_DESC_SIZE); + if (ret) + goto err_free_devcmd2; + + fetch_idx = ioread32(&dc2c->wq.ctrl->fetch_index); + if (fetch_idx == 0xFFFFFFFF) { /* check for hardware gone */ + /* Hardware surprise removal: reset fetch_index */ + fetch_idx = 0; + } + + /* + * Don't change fetch_index ever and + * set posted_index same as fetch_index + * when setting up the WQ for devcmd2. + */ + vnic_wq_init_start(&dc2c->wq, 0, fetch_idx, fetch_idx, 0, 0); + svnic_wq_enable(&dc2c->wq); + ret = svnic_dev_alloc_desc_ring(vdev, + &dc2c->results_ring, + DEVCMD2_RING_SIZE, + DEVCMD2_DESC_SIZE); + if (ret) + goto err_free_wq; + + dc2c->result = (struct devcmd2_result *) dc2c->results_ring.descs; + dc2c->cmd_ring = (struct vnic_devcmd2 *) dc2c->wq.ring.descs; + dc2c->wq_ctrl = dc2c->wq.ctrl; + vdev->args[0] = (u64) dc2c->results_ring.base_addr | VNIC_PADDR_TARGET; + vdev->args[1] = DEVCMD2_RING_SIZE; + + ret = _svnic_dev_cmd2(vdev, CMD_INITIALIZE_DEVCMD2, VNIC_DVCMD_TMO); + if (ret < 0) + goto err_free_desc_ring; + + vdev->devcmd_rtn = &_svnic_dev_cmd2; + pr_info("DEVCMD2 Initialized.\n"); + + return ret; + +err_free_desc_ring: + svnic_dev_free_desc_ring(vdev, &dc2c->results_ring); + +err_free_wq: + svnic_wq_disable(&dc2c->wq); + svnic_wq_free(&dc2c->wq); + +err_free_devcmd2: + kfree(dc2c); + vdev->devcmd2 = NULL; + + return ret; +} /* end of svnic_dev_init_devcmd2 */ + +static void vnic_dev_deinit_devcmd2(struct vnic_dev *vdev) +{ + struct devcmd2_controller *dc2c = vdev->devcmd2; + + vdev->devcmd2 = NULL; + vdev->devcmd_rtn = NULL; + + svnic_dev_free_desc_ring(vdev, &dc2c->results_ring); + svnic_wq_disable(&dc2c->wq); + svnic_wq_free(&dc2c->wq); + kfree(dc2c); +} + +int svnic_dev_cmd(struct vnic_dev *vdev, enum vnic_devcmd_cmd cmd, + u64 *a0, u64 *a1, int wait) +{ + int err; + + memset(vdev->args, 0, sizeof(vdev->args)); + vdev->args[0] = *a0; + vdev->args[1] = *a1; + + err = (*vdev->devcmd_rtn)(vdev, cmd, wait); + + *a0 = vdev->args[0]; + *a1 = vdev->args[1]; + + return err; +} + +int svnic_dev_fw_info(struct vnic_dev *vdev, + struct vnic_devcmd_fw_info **fw_info) +{ + u64 a0, a1 = 0; + int wait = VNIC_DVCMD_TMO; + int err = 0; + + if (!vdev->fw_info) { + vdev->fw_info = dma_alloc_coherent(&vdev->pdev->dev, + sizeof(struct vnic_devcmd_fw_info), + &vdev->fw_info_pa, GFP_KERNEL); + if (!vdev->fw_info) + return -ENOMEM; + + a0 = vdev->fw_info_pa; + + /* only get fw_info once and cache it */ + err = svnic_dev_cmd(vdev, CMD_MCPU_FW_INFO, &a0, &a1, wait); + } + + *fw_info = vdev->fw_info; + + return err; +} + +int svnic_dev_spec(struct vnic_dev *vdev, unsigned int offset, + unsigned int size, void *value) +{ + u64 a0, a1; + int wait = VNIC_DVCMD_TMO; + int err; + + a0 = offset; + a1 = size; + + err = svnic_dev_cmd(vdev, CMD_DEV_SPEC, &a0, &a1, wait); + + switch (size) { + case 1: + *(u8 *)value = (u8)a0; + break; + case 2: + *(u16 *)value = (u16)a0; + break; + case 4: + *(u32 *)value = (u32)a0; + break; + case 8: + *(u64 *)value = a0; + break; + default: + BUG(); + break; + } + + return err; +} + +int svnic_dev_stats_clear(struct vnic_dev *vdev) +{ + u64 a0 = 0, a1 = 0; + int wait = VNIC_DVCMD_TMO; + + return svnic_dev_cmd(vdev, CMD_STATS_CLEAR, &a0, &a1, wait); +} + +int svnic_dev_stats_dump(struct vnic_dev *vdev, struct vnic_stats **stats) +{ + u64 a0, a1; + int wait = VNIC_DVCMD_TMO; + + if (!vdev->stats) { + vdev->stats = dma_alloc_coherent(&vdev->pdev->dev, + sizeof(struct vnic_stats), &vdev->stats_pa, GFP_KERNEL); + if (!vdev->stats) + return -ENOMEM; + } + + *stats = vdev->stats; + a0 = vdev->stats_pa; + a1 = sizeof(struct vnic_stats); + + return svnic_dev_cmd(vdev, CMD_STATS_DUMP, &a0, &a1, wait); +} + +int svnic_dev_close(struct vnic_dev *vdev) +{ + u64 a0 = 0, a1 = 0; + int wait = VNIC_DVCMD_TMO; + + return svnic_dev_cmd(vdev, CMD_CLOSE, &a0, &a1, wait); +} + +int svnic_dev_enable_wait(struct vnic_dev *vdev) +{ + u64 a0 = 0, a1 = 0; + int wait = VNIC_DVCMD_TMO; + int err = 0; + + err = svnic_dev_cmd(vdev, CMD_ENABLE_WAIT, &a0, &a1, wait); + if (err == ERR_ECMDUNKNOWN) + return svnic_dev_cmd(vdev, CMD_ENABLE, &a0, &a1, wait); + + return err; +} + +int svnic_dev_disable(struct vnic_dev *vdev) +{ + u64 a0 = 0, a1 = 0; + int wait = VNIC_DVCMD_TMO; + + return svnic_dev_cmd(vdev, CMD_DISABLE, &a0, &a1, wait); +} + +int svnic_dev_open(struct vnic_dev *vdev, int arg) +{ + u64 a0 = (u32)arg, a1 = 0; + int wait = VNIC_DVCMD_TMO; + + return svnic_dev_cmd(vdev, CMD_OPEN, &a0, &a1, wait); +} + +int svnic_dev_open_done(struct vnic_dev *vdev, int *done) +{ + u64 a0 = 0, a1 = 0; + int wait = VNIC_DVCMD_TMO; + int err; + + *done = 0; + + err = svnic_dev_cmd(vdev, CMD_OPEN_STATUS, &a0, &a1, wait); + if (err) + return err; + + *done = (a0 == 0); + + return 0; +} + +int svnic_dev_notify_set(struct vnic_dev *vdev, u16 intr) +{ + u64 a0, a1; + int wait = VNIC_DVCMD_TMO; + + if (!vdev->notify) { + vdev->notify = dma_alloc_coherent(&vdev->pdev->dev, + sizeof(struct vnic_devcmd_notify), + &vdev->notify_pa, GFP_KERNEL); + if (!vdev->notify) + return -ENOMEM; + } + + a0 = vdev->notify_pa; + a1 = ((u64)intr << 32) & VNIC_NOTIFY_INTR_MASK; + a1 += sizeof(struct vnic_devcmd_notify); + + return svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait); +} + +void svnic_dev_notify_unset(struct vnic_dev *vdev) +{ + u64 a0, a1; + int wait = VNIC_DVCMD_TMO; + + a0 = 0; /* paddr = 0 to unset notify buffer */ + a1 = VNIC_NOTIFY_INTR_MASK; /* intr num = -1 to unreg for intr */ + a1 += sizeof(struct vnic_devcmd_notify); + + svnic_dev_cmd(vdev, CMD_NOTIFY, &a0, &a1, wait); +} + +static int vnic_dev_notify_ready(struct vnic_dev *vdev) +{ + u32 *words; + unsigned int nwords = sizeof(struct vnic_devcmd_notify) / 4; + unsigned int i; + u32 csum; + + if (!vdev->notify) + return 0; + + do { + csum = 0; + memcpy(&vdev->notify_copy, vdev->notify, + sizeof(struct vnic_devcmd_notify)); + words = (u32 *)&vdev->notify_copy; + for (i = 1; i < nwords; i++) + csum += words[i]; + } while (csum != words[0]); + + return 1; +} + +int svnic_dev_init(struct vnic_dev *vdev, int arg) +{ + u64 a0 = (u32)arg, a1 = 0; + int wait = VNIC_DVCMD_TMO; + + return svnic_dev_cmd(vdev, CMD_INIT, &a0, &a1, wait); +} + +int svnic_dev_link_status(struct vnic_dev *vdev) +{ + if (vdev->linkstatus) + return *vdev->linkstatus; + + if (!vnic_dev_notify_ready(vdev)) + return 0; + + return vdev->notify_copy.link_state; +} + +u32 svnic_dev_link_down_cnt(struct vnic_dev *vdev) +{ + if (!vnic_dev_notify_ready(vdev)) + return 0; + + return vdev->notify_copy.link_down_cnt; +} + +void svnic_dev_set_intr_mode(struct vnic_dev *vdev, + enum vnic_dev_intr_mode intr_mode) +{ + vdev->intr_mode = intr_mode; +} + +enum vnic_dev_intr_mode svnic_dev_get_intr_mode(struct vnic_dev *vdev) +{ + return vdev->intr_mode; +} + +void svnic_dev_unregister(struct vnic_dev *vdev) +{ + if (vdev) { + if (vdev->notify) + dma_free_coherent(&vdev->pdev->dev, + sizeof(struct vnic_devcmd_notify), + vdev->notify, + vdev->notify_pa); + if (vdev->linkstatus) + dma_free_coherent(&vdev->pdev->dev, + sizeof(u32), + vdev->linkstatus, + vdev->linkstatus_pa); + if (vdev->stats) + dma_free_coherent(&vdev->pdev->dev, + sizeof(struct vnic_stats), + vdev->stats, vdev->stats_pa); + if (vdev->fw_info) + dma_free_coherent(&vdev->pdev->dev, + sizeof(struct vnic_devcmd_fw_info), + vdev->fw_info, vdev->fw_info_pa); + if (vdev->devcmd2) + vnic_dev_deinit_devcmd2(vdev); + kfree(vdev); + } +} + +struct vnic_dev *svnic_dev_alloc_discover(struct vnic_dev *vdev, + void *priv, + struct pci_dev *pdev, + struct vnic_dev_bar *bar, + unsigned int num_bars) +{ + if (!vdev) { + vdev = kzalloc(sizeof(struct vnic_dev), GFP_ATOMIC); + if (!vdev) + return NULL; + } + + vdev->priv = priv; + vdev->pdev = pdev; + + if (vnic_dev_discover_res(vdev, bar, num_bars)) + goto err_out; + + return vdev; + +err_out: + svnic_dev_unregister(vdev); + + return NULL; +} /* end of svnic_dev_alloc_discover */ + +/* + * fallback option is left to keep the interface common for other vnics. + */ +int svnic_dev_cmd_init(struct vnic_dev *vdev, int fallback) +{ + int err = -ENODEV; + void __iomem *p; + + p = svnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0); + if (p) + err = svnic_dev_init_devcmd2(vdev); + else + pr_err("DEVCMD2 resource not found.\n"); + + return err; +} /* end of svnic_dev_cmd_init */ |