new file mode 100644
@@ -0,0 +1,1122 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+/*
+ * Copyright 2018 Amazon.com, Inc. or its affiliates.
+ */
+
+#include "efa.h"
+#include "efa_com.h"
+#include "efa_regs_defs.h"
+
+#define ADMIN_CMD_TIMEOUT_US 30000000 /* usecs */
+
+#define EFA_REG_READ_TIMEOUT_US 50000 /* usecs */
+#define EFA_MMIO_READ_INVALID 0xffffffff
+
+#define EFA_POLL_INTERVAL_MS 100 /* msecs */
+
+#define EFA_ASYNC_QUEUE_DEPTH 16
+#define EFA_ADMIN_QUEUE_DEPTH 32
+
+#define MIN_EFA_VER\
+ ((EFA_ADMIN_API_VERSION_MAJOR << EFA_REGS_VERSION_MAJOR_VERSION_SHIFT) | \
+ (EFA_ADMIN_API_VERSION_MINOR & EFA_REGS_VERSION_MINOR_VERSION_MASK))
+
+#define EFA_CTRL_MAJOR 0
+#define EFA_CTRL_MINOR 0
+#define EFA_CTRL_SUB_MINOR 1
+
+#define MIN_EFA_CTRL_VER \
+ (((EFA_CTRL_MAJOR) << \
+ (EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_SHIFT)) | \
+ ((EFA_CTRL_MINOR) << \
+ (EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_SHIFT)) | \
+ (EFA_CTRL_SUB_MINOR))
+
+#define EFA_DMA_ADDR_TO_UINT32_LOW(x) ((u32)((u64)(x)))
+#define EFA_DMA_ADDR_TO_UINT32_HIGH(x) ((u32)(((u64)(x)) >> 32))
+
+#define EFA_REGS_ADMIN_INTR_MASK 1
+
+enum efa_cmd_status {
+ EFA_CMD_SUBMITTED,
+ EFA_CMD_COMPLETED,
+ /* Abort - canceled by the driver */
+ EFA_CMD_ABORTED,
+};
+
+struct efa_comp_ctx {
+ struct completion wait_event;
+ struct efa_admin_acq_entry *user_cqe;
+ u32 comp_size;
+ enum efa_cmd_status status;
+ /* status from the device */
+ u8 comp_status;
+ u8 cmd_opcode;
+ bool occupied;
+};
+
+static u32 efa_com_reg_read32(struct efa_com_dev *edev, u16 offset)
+{
+ struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+ struct efa_admin_mmio_req_read_less_resp *read_resp;
+ unsigned long exp_time;
+ u32 mmio_read_reg;
+ u32 err;
+
+ read_resp = mmio_read->read_resp;
+
+ spin_lock(&mmio_read->lock);
+ mmio_read->seq_num++;
+
+ /* trash DMA req_id to identify when hardware is done */
+ read_resp->req_id = mmio_read->seq_num + 0x9aL;
+ mmio_read_reg = (offset << EFA_REGS_MMIO_REG_READ_REG_OFF_SHIFT) &
+ EFA_REGS_MMIO_REG_READ_REG_OFF_MASK;
+ mmio_read_reg |= mmio_read->seq_num &
+ EFA_REGS_MMIO_REG_READ_REQ_ID_MASK;
+
+ writel(mmio_read_reg, edev->reg_bar + EFA_REGS_MMIO_REG_READ_OFF);
+
+ exp_time = jiffies + usecs_to_jiffies(mmio_read->mmio_read_timeout);
+ do {
+ if (READ_ONCE(read_resp->req_id) == mmio_read->seq_num)
+ break;
+ udelay(1);
+ } while (time_is_after_jiffies(exp_time));
+
+ if (unlikely(read_resp->req_id != mmio_read->seq_num)) {
+ pr_err("Reading register timed out. expected: req id[%u] offset[%#x] actual: req id[%u] offset[%#x]\n",
+ mmio_read->seq_num, offset, read_resp->req_id,
+ read_resp->reg_off);
+ err = EFA_MMIO_READ_INVALID;
+ goto out;
+ }
+
+ if (read_resp->reg_off != offset) {
+ pr_err("Reading register failed: wrong offset provided");
+ err = EFA_MMIO_READ_INVALID;
+ goto out;
+ }
+
+ err = read_resp->reg_val;
+out:
+ spin_unlock(&mmio_read->lock);
+ return err;
+}
+
+static int efa_com_admin_init_sq(struct efa_com_dev *edev)
+{
+ struct efa_com_admin_queue *queue = &edev->admin_queue;
+ struct efa_com_admin_sq *sq = &queue->sq;
+ u16 size = ADMIN_SQ_SIZE(queue->depth);
+ u32 addr_high;
+ u32 addr_low;
+ u32 aq_caps;
+
+ sq->entries = dma_zalloc_coherent(queue->dmadev, size, &sq->dma_addr,
+ GFP_KERNEL);
+ if (!sq->entries)
+ return -ENOMEM;
+
+ spin_lock_init(&sq->lock);
+
+ sq->cc = 0;
+ sq->pc = 0;
+ sq->phase = 1;
+
+ sq->db_addr = (u32 __iomem *)(edev->reg_bar + EFA_REGS_AQ_PROD_DB_OFF);
+
+ pr_debug("init sq dma_addr....\n");
+ addr_high = EFA_DMA_ADDR_TO_UINT32_HIGH(sq->dma_addr);
+ addr_low = EFA_DMA_ADDR_TO_UINT32_LOW(sq->dma_addr);
+
+ writel(addr_low, edev->reg_bar + EFA_REGS_AQ_BASE_LO_OFF);
+ writel(addr_high, edev->reg_bar + EFA_REGS_AQ_BASE_HI_OFF);
+
+ aq_caps = 0;
+ aq_caps |= queue->depth & EFA_REGS_AQ_CAPS_AQ_DEPTH_MASK;
+ aq_caps |= (sizeof(struct efa_admin_aq_entry) <<
+ EFA_REGS_AQ_CAPS_AQ_ENTRY_SIZE_SHIFT) &
+ EFA_REGS_AQ_CAPS_AQ_ENTRY_SIZE_MASK;
+
+ writel(aq_caps, edev->reg_bar + EFA_REGS_AQ_CAPS_OFF);
+
+ return 0;
+}
+
+static int efa_com_admin_init_cq(struct efa_com_dev *edev)
+{
+ struct efa_com_admin_queue *queue = &edev->admin_queue;
+ struct efa_com_admin_cq *cq = &queue->cq;
+ u16 size = ADMIN_CQ_SIZE(queue->depth);
+ u32 addr_high;
+ u32 addr_low;
+ u32 acq_caps;
+
+ cq->entries = dma_zalloc_coherent(queue->dmadev, size, &cq->dma_addr,
+ GFP_KERNEL);
+ if (!cq->entries)
+ return -ENOMEM;
+
+ spin_lock_init(&cq->lock);
+
+ cq->cc = 0;
+ cq->phase = 1;
+
+ pr_debug("init cq dma_addr....\n");
+ addr_high = EFA_DMA_ADDR_TO_UINT32_HIGH(cq->dma_addr);
+ addr_low = EFA_DMA_ADDR_TO_UINT32_LOW(cq->dma_addr);
+
+ writel(addr_low, edev->reg_bar + EFA_REGS_ACQ_BASE_LO_OFF);
+ writel(addr_high, edev->reg_bar + EFA_REGS_ACQ_BASE_HI_OFF);
+
+ acq_caps = 0;
+ acq_caps |= queue->depth & EFA_REGS_ACQ_CAPS_ACQ_DEPTH_MASK;
+ acq_caps |= (sizeof(struct efa_admin_acq_entry) <<
+ EFA_REGS_ACQ_CAPS_ACQ_ENTRY_SIZE_SHIFT) &
+ EFA_REGS_ACQ_CAPS_ACQ_ENTRY_SIZE_MASK;
+ acq_caps |= (queue->msix_vector_idx <<
+ EFA_REGS_ACQ_CAPS_ACQ_MSIX_VECTOR_SHIFT) &
+ EFA_REGS_ACQ_CAPS_ACQ_MSIX_VECTOR_MASK;
+
+ writel(acq_caps, edev->reg_bar + EFA_REGS_ACQ_CAPS_OFF);
+
+ return 0;
+}
+
+static int efa_com_admin_init_aenq(struct efa_com_dev *edev,
+ struct efa_aenq_handlers *aenq_handlers)
+{
+ struct efa_com_aenq *aenq = &edev->aenq;
+ u32 addr_low, addr_high, aenq_caps;
+ u16 size;
+
+ pr_debug("init aenq...\n");
+
+ if (unlikely(!aenq_handlers)) {
+ pr_err("aenq handlers pointer is NULL\n");
+ return -EINVAL;
+ }
+
+ size = ADMIN_AENQ_SIZE(EFA_ASYNC_QUEUE_DEPTH);
+ aenq->entries = dma_zalloc_coherent(edev->dmadev, size, &aenq->dma_addr,
+ GFP_KERNEL);
+ if (!aenq->entries)
+ return -ENOMEM;
+
+ aenq->aenq_handlers = aenq_handlers;
+ aenq->depth = EFA_ASYNC_QUEUE_DEPTH;
+ aenq->cc = 0;
+ aenq->phase = 1;
+
+ addr_low = EFA_DMA_ADDR_TO_UINT32_LOW(aenq->dma_addr);
+ addr_high = EFA_DMA_ADDR_TO_UINT32_HIGH(aenq->dma_addr);
+
+ writel(addr_low, edev->reg_bar + EFA_REGS_AENQ_BASE_LO_OFF);
+ writel(addr_high, edev->reg_bar + EFA_REGS_AENQ_BASE_HI_OFF);
+
+ aenq_caps = 0;
+ aenq_caps |= aenq->depth & EFA_REGS_AENQ_CAPS_AENQ_DEPTH_MASK;
+ aenq_caps |= (sizeof(struct efa_admin_aenq_entry) <<
+ EFA_REGS_AENQ_CAPS_AENQ_ENTRY_SIZE_SHIFT) &
+ EFA_REGS_AENQ_CAPS_AENQ_ENTRY_SIZE_MASK;
+ aenq_caps |= (aenq->msix_vector_idx
+ << EFA_REGS_AENQ_CAPS_AENQ_MSIX_VECTOR_SHIFT) &
+ EFA_REGS_AENQ_CAPS_AENQ_MSIX_VECTOR_MASK;
+ writel(aenq_caps, edev->reg_bar + EFA_REGS_AENQ_CAPS_OFF);
+
+ /*
+ * Init cons_db to mark that all entries in the queue
+ * are initially available
+ */
+ writel(edev->aenq.cc, edev->reg_bar + EFA_REGS_AENQ_CONS_DB_OFF);
+
+ pr_debug("init aenq succeeded\n");
+
+ return 0;
+}
+
+/* ID to be used with efa_com_get_comp_ctx */
+static u16 efa_com_alloc_ctx_id(struct efa_com_admin_queue *admin_queue)
+{
+ u16 ctx_id;
+
+ spin_lock(&admin_queue->comp_ctx_lock);
+ ctx_id = admin_queue->comp_ctx_pool[admin_queue->comp_ctx_pool_next];
+ admin_queue->comp_ctx_pool_next++;
+ spin_unlock(&admin_queue->comp_ctx_lock);
+
+ return ctx_id;
+}
+
+static inline void efa_com_put_comp_ctx(struct efa_com_admin_queue *queue,
+ struct efa_comp_ctx *comp_ctx)
+{
+ u16 comp_id = comp_ctx->user_cqe->acq_common_descriptor.command &
+ EFA_ADMIN_ACQ_COMMON_DESC_COMMAND_ID_MASK;
+
+ pr_debug("Putting completion command_id %d", comp_id);
+ comp_ctx->occupied = false;
+ spin_lock(&queue->comp_ctx_lock);
+ queue->comp_ctx_pool_next--;
+ queue->comp_ctx_pool[queue->comp_ctx_pool_next] = comp_id;
+ spin_unlock(&queue->comp_ctx_lock);
+ up(&queue->avail_cmds);
+}
+
+static struct efa_comp_ctx *efa_com_get_comp_ctx(struct efa_com_admin_queue *queue,
+ u16 command_id, bool capture)
+{
+ if (unlikely(command_id >= queue->depth)) {
+ pr_err("command id is larger than the queue size. cmd_id: %u queue size %d\n",
+ command_id, queue->depth);
+ return NULL;
+ }
+
+ if (unlikely(queue->comp_ctx[command_id].occupied && capture)) {
+ pr_err("Completion context is occupied\n");
+ return NULL;
+ }
+
+ if (capture) {
+ queue->comp_ctx[command_id].occupied = true;
+ pr_debug("Taking completion ctxt command_id %d", command_id);
+ }
+
+ return &queue->comp_ctx[command_id];
+}
+
+static struct efa_comp_ctx *__efa_com_submit_admin_cmd(struct efa_com_admin_queue *admin_queue,
+ struct efa_admin_aq_entry *cmd,
+ size_t cmd_size_in_bytes,
+ struct efa_admin_acq_entry *comp,
+ size_t comp_size_in_bytes)
+{
+ struct efa_comp_ctx *comp_ctx;
+ u16 queue_size_mask;
+ u16 ctx_id;
+ u16 pi;
+
+ queue_size_mask = admin_queue->depth - 1;
+ pi = admin_queue->sq.pc & queue_size_mask;
+
+ ctx_id = efa_com_alloc_ctx_id(admin_queue);
+
+ cmd->aq_common_descriptor.flags |= admin_queue->sq.phase &
+ EFA_ADMIN_AQ_COMMON_DESC_PHASE_MASK;
+
+ cmd->aq_common_descriptor.command_id |= ctx_id &
+ EFA_ADMIN_AQ_COMMON_DESC_COMMAND_ID_MASK;
+
+ comp_ctx = efa_com_get_comp_ctx(admin_queue, ctx_id, true);
+ if (unlikely(!comp_ctx))
+ return ERR_PTR(-EINVAL);
+
+ comp_ctx->status = EFA_CMD_SUBMITTED;
+ comp_ctx->comp_size = comp_size_in_bytes;
+ comp_ctx->user_cqe = comp;
+ comp_ctx->cmd_opcode = cmd->aq_common_descriptor.opcode;
+
+ reinit_completion(&comp_ctx->wait_event);
+
+ memcpy(&admin_queue->sq.entries[pi], cmd, cmd_size_in_bytes);
+
+ admin_queue->sq.pc++;
+ admin_queue->stats.submitted_cmd++;
+
+ if (unlikely((admin_queue->sq.pc & queue_size_mask) == 0))
+ admin_queue->sq.phase = !admin_queue->sq.phase;
+
+ /* barrier not needed in case of writel */
+ writel(admin_queue->sq.pc, admin_queue->sq.db_addr);
+
+ return comp_ctx;
+}
+
+static inline int efa_com_init_comp_ctxt(struct efa_com_admin_queue *queue)
+{
+ size_t pool_size = queue->depth * sizeof(*queue->comp_ctx_pool);
+ size_t size = queue->depth * sizeof(struct efa_comp_ctx);
+ struct efa_comp_ctx *comp_ctx;
+ u16 i;
+
+ queue->comp_ctx = devm_kzalloc(queue->dmadev, size, GFP_KERNEL);
+ queue->comp_ctx_pool =
+ devm_kzalloc(queue->dmadev, pool_size, GFP_KERNEL);
+ if (unlikely(!queue->comp_ctx || !queue->comp_ctx_pool)) {
+ devm_kfree(queue->dmadev, queue->comp_ctx_pool);
+ devm_kfree(queue->dmadev, queue->comp_ctx);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < queue->depth; i++) {
+ comp_ctx = efa_com_get_comp_ctx(queue, i, false);
+ if (comp_ctx)
+ init_completion(&comp_ctx->wait_event);
+
+ queue->comp_ctx_pool[i] = i;
+ }
+
+ spin_lock_init(&queue->comp_ctx_lock);
+
+ queue->comp_ctx_pool_next = 0;
+
+ return 0;
+}
+
+static struct efa_comp_ctx *efa_com_submit_admin_cmd(struct efa_com_admin_queue *admin_queue,
+ struct efa_admin_aq_entry *cmd,
+ size_t cmd_size_in_bytes,
+ struct efa_admin_acq_entry *comp,
+ size_t comp_size_in_bytes)
+{
+ struct efa_comp_ctx *comp_ctx;
+
+ /* In case of queue FULL */
+ down(&admin_queue->avail_cmds);
+
+ spin_lock(&admin_queue->sq.lock);
+ if (unlikely(!test_bit(EFA_AQ_STATE_RUNNING_BIT, &admin_queue->state))) {
+ pr_err("Admin queue is closed\n");
+ spin_unlock(&admin_queue->sq.lock);
+ return ERR_PTR(-ENODEV);
+ }
+
+ comp_ctx =
+ __efa_com_submit_admin_cmd(admin_queue, cmd, cmd_size_in_bytes,
+ comp, comp_size_in_bytes);
+ spin_unlock(&admin_queue->sq.lock);
+ if (unlikely(IS_ERR(comp_ctx)))
+ clear_bit(EFA_AQ_STATE_RUNNING_BIT, &admin_queue->state);
+
+ return comp_ctx;
+}
+
+static void efa_com_handle_single_admin_completion(struct efa_com_admin_queue *admin_queue,
+ struct efa_admin_acq_entry *cqe)
+{
+ struct efa_comp_ctx *comp_ctx;
+ u16 cmd_id;
+
+ cmd_id = cqe->acq_common_descriptor.command &
+ EFA_ADMIN_ACQ_COMMON_DESC_COMMAND_ID_MASK;
+
+ comp_ctx = efa_com_get_comp_ctx(admin_queue, cmd_id, false);
+ if (unlikely(!comp_ctx)) {
+ pr_err("comp_ctx is NULL. Changing the admin queue running state\n");
+ clear_bit(EFA_AQ_STATE_RUNNING_BIT, &admin_queue->state);
+ return;
+ }
+
+ comp_ctx->status = EFA_CMD_COMPLETED;
+ comp_ctx->comp_status = cqe->acq_common_descriptor.status;
+ if (comp_ctx->user_cqe)
+ memcpy(comp_ctx->user_cqe, cqe, comp_ctx->comp_size);
+
+ if (!admin_queue->polling)
+ complete(&comp_ctx->wait_event);
+}
+
+static void efa_com_handle_admin_completion(struct efa_com_admin_queue *admin_queue)
+{
+ struct efa_admin_acq_entry *cqe;
+ u16 queue_size_mask;
+ u16 comp_num = 0;
+ u8 phase;
+ u16 ci;
+
+ queue_size_mask = admin_queue->depth - 1;
+
+ ci = admin_queue->cq.cc & queue_size_mask;
+ phase = admin_queue->cq.phase;
+
+ cqe = &admin_queue->cq.entries[ci];
+
+ /* Go over all the completions */
+ while ((READ_ONCE(cqe->acq_common_descriptor.flags) &
+ EFA_ADMIN_ACQ_COMMON_DESC_PHASE_MASK) == phase) {
+ /*
+ * Do not read the rest of the completion entry before the
+ * phase bit was validated
+ */
+ dma_rmb();
+ efa_com_handle_single_admin_completion(admin_queue, cqe);
+
+ ci++;
+ comp_num++;
+ if (unlikely(ci == admin_queue->depth)) {
+ ci = 0;
+ phase = !phase;
+ }
+
+ cqe = &admin_queue->cq.entries[ci];
+ }
+
+ admin_queue->cq.cc += comp_num;
+ admin_queue->cq.phase = phase;
+ admin_queue->sq.cc += comp_num;
+ admin_queue->stats.completed_cmd += comp_num;
+}
+
+static int efa_com_comp_status_to_errno(u8 comp_status)
+{
+ if (unlikely(comp_status))
+ pr_err("admin command failed[%u]\n", comp_status);
+
+ switch (comp_status) {
+ case EFA_ADMIN_SUCCESS:
+ return 0;
+ case EFA_ADMIN_RESOURCE_ALLOCATION_FAILURE:
+ return -ENOMEM;
+ case EFA_ADMIN_UNSUPPORTED_OPCODE:
+ return -EOPNOTSUPP;
+ case EFA_ADMIN_BAD_OPCODE:
+ case EFA_ADMIN_MALFORMED_REQUEST:
+ case EFA_ADMIN_ILLEGAL_PARAMETER:
+ case EFA_ADMIN_UNKNOWN_ERROR:
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int efa_com_wait_and_process_admin_cq_polling(struct efa_comp_ctx *comp_ctx,
+ struct efa_com_admin_queue *admin_queue)
+{
+ unsigned long timeout;
+ unsigned long flags;
+ int err;
+
+ timeout = jiffies + usecs_to_jiffies(admin_queue->completion_timeout);
+
+ while (1) {
+ spin_lock_irqsave(&admin_queue->cq.lock, flags);
+ efa_com_handle_admin_completion(admin_queue);
+ spin_unlock_irqrestore(&admin_queue->cq.lock, flags);
+
+ if (comp_ctx->status != EFA_CMD_SUBMITTED)
+ break;
+
+ if (time_is_before_jiffies(timeout)) {
+ pr_err("Wait for completion (polling) timeout\n");
+ /* EFA didn't have any completion */
+ admin_queue->stats.no_completion++;
+
+ clear_bit(EFA_AQ_STATE_RUNNING_BIT, &admin_queue->state);
+ err = -ETIME;
+ goto out;
+ }
+
+ msleep(admin_queue->poll_interval);
+ }
+
+ if (unlikely(comp_ctx->status == EFA_CMD_ABORTED)) {
+ pr_err("Command was aborted\n");
+ admin_queue->stats.aborted_cmd++;
+ err = -ENODEV;
+ goto out;
+ }
+
+ WARN(comp_ctx->status != EFA_CMD_COMPLETED, "Invalid comp status %d\n",
+ comp_ctx->status);
+
+ err = efa_com_comp_status_to_errno(comp_ctx->comp_status);
+out:
+ efa_com_put_comp_ctx(admin_queue, comp_ctx);
+ return err;
+}
+
+static int efa_com_wait_and_process_admin_cq_interrupts(struct efa_comp_ctx *comp_ctx,
+ struct efa_com_admin_queue *admin_queue)
+{
+ unsigned long flags;
+ int err;
+
+ wait_for_completion_timeout(&comp_ctx->wait_event,
+ usecs_to_jiffies(
+ admin_queue->completion_timeout));
+
+ /*
+ * In case the command wasn't completed find out the root cause.
+ * There might be 2 kinds of errors
+ * 1) No completion (timeout reached)
+ * 2) There is completion but the device didn't get any msi-x interrupt.
+ */
+ if (unlikely(comp_ctx->status == EFA_CMD_SUBMITTED)) {
+ spin_lock_irqsave(&admin_queue->cq.lock, flags);
+ efa_com_handle_admin_completion(admin_queue);
+ spin_unlock_irqrestore(&admin_queue->cq.lock, flags);
+
+ admin_queue->stats.no_completion++;
+
+ if (comp_ctx->status == EFA_CMD_COMPLETED)
+ pr_err("The device sent a completion but the driver didn't receive any MSI-X interrupt for admin cmd %d status %d (ctx: 0x%p, sq producer: %d, sq consumer: %d, cq consumer: %d)\n",
+ comp_ctx->cmd_opcode, comp_ctx->status, comp_ctx,
+ admin_queue->sq.pc, admin_queue->sq.cc,
+ admin_queue->cq.cc);
+ else
+ pr_err("The device didn't send any completion for admin cmd %d status %d (ctx 0x%p, sq producer: %d, sq consumer: %d, cq consumer: %d)\n",
+ comp_ctx->cmd_opcode, comp_ctx->status, comp_ctx,
+ admin_queue->sq.pc, admin_queue->sq.cc,
+ admin_queue->cq.cc);
+
+ clear_bit(EFA_AQ_STATE_RUNNING_BIT, &admin_queue->state);
+ err = -ETIME;
+ goto out;
+ }
+
+ err = efa_com_comp_status_to_errno(comp_ctx->comp_status);
+out:
+ efa_com_put_comp_ctx(admin_queue, comp_ctx);
+ return err;
+}
+
+/*
+ * There are two types to wait for completion.
+ * Polling mode - wait until the completion is available.
+ * Async mode - wait on wait queue until the completion is ready
+ * (or the timeout expired).
+ * It is expected that the IRQ called efa_com_handle_admin_completion
+ * to mark the completions.
+ */
+static int efa_com_wait_and_process_admin_cq(struct efa_comp_ctx *comp_ctx,
+ struct efa_com_admin_queue *admin_queue)
+{
+ if (admin_queue->polling)
+ return efa_com_wait_and_process_admin_cq_polling(comp_ctx,
+ admin_queue);
+
+ return efa_com_wait_and_process_admin_cq_interrupts(comp_ctx,
+ admin_queue);
+}
+
+/*
+ * efa_com_cmd_exec - Execute admin command
+ * @admin_queue: admin queue.
+ * @cmd: the admin command to execute.
+ * @cmd_size: the command size.
+ * @comp: command completion return entry.
+ * @comp_size: command completion size.
+ * Submit an admin command and then wait until the device will return a
+ * completion.
+ * The completion will be copied into comp.
+ *
+ * @return - 0 on success, negative value on failure.
+ */
+int efa_com_cmd_exec(struct efa_com_admin_queue *admin_queue,
+ struct efa_admin_aq_entry *cmd,
+ size_t cmd_size,
+ struct efa_admin_acq_entry *comp,
+ size_t comp_size)
+{
+ struct efa_comp_ctx *comp_ctx;
+ int err;
+
+ pr_debug("opcode %d", cmd->aq_common_descriptor.opcode);
+ comp_ctx = efa_com_submit_admin_cmd(admin_queue, cmd, cmd_size, comp,
+ comp_size);
+ if (unlikely(IS_ERR(comp_ctx))) {
+ pr_err("Failed to submit command opcode %u err %ld\n",
+ cmd->aq_common_descriptor.opcode, PTR_ERR(comp_ctx));
+
+ return PTR_ERR(comp_ctx);
+ }
+
+ err = efa_com_wait_and_process_admin_cq(comp_ctx, admin_queue);
+ if (unlikely(err))
+ pr_err("Failed to process command opcode %u err %d\n",
+ cmd->aq_common_descriptor.opcode, err);
+
+ return err;
+}
+
+/*
+ * efa_com_abort_admin_commands - Abort all the outstanding admin commands.
+ * @edev: EFA communication layer struct
+ *
+ * This method aborts all the outstanding admin commands.
+ * The caller should then call efa_com_wait_for_abort_completion to make sure
+ * all the commands were completed.
+ */
+static void efa_com_abort_admin_commands(struct efa_com_dev *edev)
+{
+ struct efa_com_admin_queue *admin_queue = &edev->admin_queue;
+ struct efa_comp_ctx *comp_ctx;
+ unsigned long flags;
+ u16 i;
+
+ spin_lock(&admin_queue->sq.lock);
+ spin_lock_irqsave(&admin_queue->cq.lock, flags);
+ for (i = 0; i < admin_queue->depth; i++) {
+ comp_ctx = efa_com_get_comp_ctx(admin_queue, i, false);
+ if (unlikely(!comp_ctx))
+ break;
+
+ comp_ctx->status = EFA_CMD_ABORTED;
+
+ complete(&comp_ctx->wait_event);
+ }
+ spin_unlock_irqrestore(&admin_queue->cq.lock, flags);
+ spin_unlock(&admin_queue->sq.lock);
+}
+
+/*
+ * efa_com_wait_for_abort_completion - Wait for admin commands abort.
+ * @edev: EFA communication layer struct
+ *
+ * This method wait until all the outstanding admin commands will be completed.
+ */
+static void efa_com_wait_for_abort_completion(struct efa_com_dev *edev)
+{
+ struct efa_com_admin_queue *admin_queue = &edev->admin_queue;
+ int i;
+
+ /* all mine */
+ for (i = 0; i < admin_queue->depth; i++)
+ down(&admin_queue->avail_cmds);
+
+ /* let it go */
+ for (i = 0; i < admin_queue->depth; i++)
+ up(&admin_queue->avail_cmds);
+}
+
+static void efa_com_admin_flush(struct efa_com_dev *edev)
+{
+ struct efa_com_admin_queue *admin_queue = &edev->admin_queue;
+
+ clear_bit(EFA_AQ_STATE_RUNNING_BIT, &admin_queue->state);
+
+ efa_com_abort_admin_commands(edev);
+ efa_com_wait_for_abort_completion(edev);
+}
+
+/*
+ * efa_com_admin_destroy - Destroy the admin and the async events queues.
+ * @edev: EFA communication layer struct
+ */
+void efa_com_admin_destroy(struct efa_com_dev *edev)
+{
+ struct efa_com_admin_queue *admin_queue = &edev->admin_queue;
+ struct efa_com_admin_cq *cq = &admin_queue->cq;
+ struct efa_com_admin_sq *sq = &admin_queue->sq;
+ struct efa_com_aenq *aenq = &edev->aenq;
+ u16 size;
+
+ efa_com_admin_flush(edev);
+
+ devm_kfree(edev->dmadev, admin_queue->comp_ctx_pool);
+ devm_kfree(edev->dmadev, admin_queue->comp_ctx);
+
+ size = ADMIN_SQ_SIZE(admin_queue->depth);
+ dma_free_coherent(edev->dmadev, size, sq->entries, sq->dma_addr);
+
+ pr_debug("destroyed SQ");
+ size = ADMIN_CQ_SIZE(admin_queue->depth);
+ dma_free_coherent(edev->dmadev, size, cq->entries, cq->dma_addr);
+ pr_debug("destroyed CQ");
+
+ size = ADMIN_AENQ_SIZE(aenq->depth);
+ dma_free_coherent(edev->dmadev, size, aenq->entries, aenq->dma_addr);
+ pr_debug("destroyed AENQ");
+}
+
+/*
+ * efa_com_set_admin_polling_mode - Set the admin completion queue polling mode
+ * @edev: EFA communication layer struct
+ * @polling: Enable/Disable polling mode
+ *
+ * Set the admin completion mode.
+ */
+void efa_com_set_admin_polling_mode(struct efa_com_dev *edev, bool polling)
+{
+ u32 mask_value = 0;
+
+ if (polling)
+ mask_value = EFA_REGS_ADMIN_INTR_MASK;
+
+ writel(mask_value, edev->reg_bar + EFA_REGS_INTR_MASK_OFF);
+ edev->admin_queue.polling = polling;
+}
+
+/*
+ * efa_com_admin_init - Init the admin and the async queues
+ * @edev: EFA communication layer struct
+ * @aenq_handlers: Those handlers to be called upon event.
+ *
+ * Initialize the admin submission and completion queues.
+ * Initialize the asynchronous events notification queues.
+ *
+ * @return - 0 on success, negative value on failure.
+ */
+int efa_com_admin_init(struct efa_com_dev *edev,
+ struct efa_aenq_handlers *aenq_handlers)
+{
+ struct efa_com_admin_queue *admin_queue = &edev->admin_queue;
+ u32 timeout;
+ u32 dev_sts;
+ u32 cap;
+ int err;
+
+ dev_sts = efa_com_reg_read32(edev, EFA_REGS_DEV_STS_OFF);
+ if (!(dev_sts & EFA_REGS_DEV_STS_READY_MASK)) {
+ pr_err("Device isn't ready, abort com init 0x%08x\n", dev_sts);
+ return -ENODEV;
+ }
+
+ admin_queue->depth = EFA_ADMIN_QUEUE_DEPTH;
+
+ admin_queue->dmadev = edev->dmadev;
+ admin_queue->polling = true;
+
+ sema_init(&admin_queue->avail_cmds, admin_queue->depth);
+
+ err = efa_com_init_comp_ctxt(admin_queue);
+ if (err)
+ return err;
+
+ err = efa_com_admin_init_sq(edev);
+ if (err)
+ goto err_destroy_comp_ctxt;
+
+ err = efa_com_admin_init_cq(edev);
+ if (err)
+ goto err_destroy_sq;
+
+ efa_com_set_admin_polling_mode(edev, false);
+
+ err = efa_com_admin_init_aenq(edev, aenq_handlers);
+ if (err)
+ goto err_destroy_cq;
+
+ cap = efa_com_reg_read32(edev, EFA_REGS_CAPS_OFF);
+ timeout = (cap & EFA_REGS_CAPS_ADMIN_CMD_TO_MASK) >>
+ EFA_REGS_CAPS_ADMIN_CMD_TO_SHIFT;
+ if (timeout)
+ /* the resolution of timeout reg is 100ms */
+ admin_queue->completion_timeout = timeout * 100000;
+ else
+ admin_queue->completion_timeout = ADMIN_CMD_TIMEOUT_US;
+
+ admin_queue->poll_interval = EFA_POLL_INTERVAL_MS;
+
+ set_bit(EFA_AQ_STATE_RUNNING_BIT, &admin_queue->state);
+
+ return 0;
+
+err_destroy_cq:
+ dma_free_coherent(edev->dmadev, ADMIN_CQ_SIZE(admin_queue->depth),
+ admin_queue->cq.entries, admin_queue->cq.dma_addr);
+err_destroy_sq:
+ dma_free_coherent(edev->dmadev, ADMIN_SQ_SIZE(admin_queue->depth),
+ admin_queue->sq.entries, admin_queue->sq.dma_addr);
+err_destroy_comp_ctxt:
+ devm_kfree(edev->dmadev, admin_queue->comp_ctx);
+
+ return err;
+}
+
+/*
+ * efa_com_admin_q_comp_intr_handler - admin queue interrupt handler
+ * @edev: EFA communication layer struct
+ *
+ * This method go over the admin completion queue and wake up all the pending
+ * threads that wait on the commands wait event.
+ *
+ * @note: Should be called after MSI-X interrupt.
+ */
+void efa_com_admin_q_comp_intr_handler(struct efa_com_dev *edev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&edev->admin_queue.cq.lock, flags);
+ efa_com_handle_admin_completion(&edev->admin_queue);
+ spin_unlock_irqrestore(&edev->admin_queue.cq.lock, flags);
+}
+
+/*
+ * efa_handle_specific_aenq_event:
+ * return the handler that is relevant to the specific event group
+ */
+static efa_aenq_handler efa_com_get_specific_aenq_cb(struct efa_com_dev *edev,
+ u16 group)
+{
+ struct efa_aenq_handlers *aenq_handlers = edev->aenq.aenq_handlers;
+
+ if (group < EFA_MAX_HANDLERS && aenq_handlers->handlers[group])
+ return aenq_handlers->handlers[group];
+
+ return aenq_handlers->unimplemented_handler;
+}
+
+/*
+ * efa_com_aenq_intr_handler - AENQ interrupt handler
+ * @edev: EFA communication layer struct
+ *
+ * Go over the async event notification queue and call the proper aenq handler.
+ */
+void efa_com_aenq_intr_handler(struct efa_com_dev *edev, void *data)
+{
+ struct efa_admin_aenq_common_desc *aenq_common;
+ struct efa_com_aenq *aenq = &edev->aenq;
+ struct efa_admin_aenq_entry *aenq_e;
+ efa_aenq_handler handler_cb;
+ u32 processed = 0;
+ u8 phase;
+ u32 ci;
+
+ ci = aenq->cc & (aenq->depth - 1);
+ phase = aenq->phase;
+ aenq_e = &aenq->entries[ci]; /* Get first entry */
+ aenq_common = &aenq_e->aenq_common_desc;
+
+ /* Go over all the events */
+ while ((READ_ONCE(aenq_common->flags) &
+ EFA_ADMIN_AENQ_COMMON_DESC_PHASE_MASK) == phase) {
+ /*
+ * Do not read the rest of the completion entry before the
+ * phase bit was validated
+ */
+ dma_rmb();
+
+ /* Handle specific event*/
+ handler_cb = efa_com_get_specific_aenq_cb(edev,
+ aenq_common->group);
+ handler_cb(data, aenq_e); /* call the actual event handler*/
+
+ /* Get next event entry */
+ ci++;
+ processed++;
+
+ if (unlikely(ci == aenq->depth)) {
+ ci = 0;
+ phase = !phase;
+ }
+ aenq_e = &aenq->entries[ci];
+ aenq_common = &aenq_e->aenq_common_desc;
+ }
+
+ aenq->cc += processed;
+ aenq->phase = phase;
+
+ /* Don't update aenq doorbell if there weren't any processed events */
+ if (!processed)
+ return;
+
+ /* barrier not needed in case of writel */
+ writel(aenq->cc, edev->reg_bar + EFA_REGS_AENQ_CONS_DB_OFF);
+}
+
+static void efa_com_mmio_reg_read_resp_addr_init(struct efa_com_dev *edev)
+{
+ struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+ u32 addr_high;
+ u32 addr_low;
+
+ /* dma_addr_bits is unknown at this point */
+ addr_high = (mmio_read->read_resp_dma_addr >> 32) & GENMASK(31, 0);
+ addr_low = mmio_read->read_resp_dma_addr & GENMASK(31, 0);
+
+ writel(addr_high, edev->reg_bar + EFA_REGS_MMIO_RESP_HI_OFF);
+ writel(addr_low, edev->reg_bar + EFA_REGS_MMIO_RESP_LO_OFF);
+}
+
+int efa_com_mmio_reg_read_init(struct efa_com_dev *edev)
+{
+ struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+
+ spin_lock_init(&mmio_read->lock);
+ mmio_read->read_resp =
+ dma_zalloc_coherent(edev->dmadev, sizeof(*mmio_read->read_resp),
+ &mmio_read->read_resp_dma_addr, GFP_KERNEL);
+ if (unlikely(!mmio_read->read_resp))
+ return -ENOMEM;
+
+ efa_com_mmio_reg_read_resp_addr_init(edev);
+
+ mmio_read->read_resp->req_id = 0;
+ mmio_read->seq_num = 0;
+ mmio_read->mmio_read_timeout = EFA_REG_READ_TIMEOUT_US;
+
+ return 0;
+}
+
+void efa_com_mmio_reg_read_destroy(struct efa_com_dev *edev)
+{
+ struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+
+ /* just in case someone is still spinning on a read */
+ spin_lock(&mmio_read->lock);
+ dma_free_coherent(edev->dmadev, sizeof(*mmio_read->read_resp),
+ mmio_read->read_resp, mmio_read->read_resp_dma_addr);
+ spin_unlock(&mmio_read->lock);
+}
+
+/*
+ * efa_com_validate_version - Validate the device parameters
+ * @edev: EFA communication layer struct
+ *
+ * This method validate the device parameters are the same as the saved
+ * parameters in edev.
+ * This method is useful after device reset, to validate the device mac address
+ * and the device offloads are the same as before the reset.
+ *
+ * @return - 0 on success negative value otherwise.
+ */
+int efa_com_validate_version(struct efa_com_dev *edev)
+{
+ u32 ctrl_ver_masked;
+ u32 ctrl_ver;
+ u32 ver;
+
+ /*
+ * Make sure the EFA version and the controller version are at least
+ * as the driver expects
+ */
+ ver = efa_com_reg_read32(edev, EFA_REGS_VERSION_OFF);
+ ctrl_ver = efa_com_reg_read32(edev,
+ EFA_REGS_CONTROLLER_VERSION_OFF);
+
+ pr_info("efa device version: %d.%d\n",
+ (ver & EFA_REGS_VERSION_MAJOR_VERSION_MASK) >>
+ EFA_REGS_VERSION_MAJOR_VERSION_SHIFT,
+ ver & EFA_REGS_VERSION_MINOR_VERSION_MASK);
+
+ if (ver < MIN_EFA_VER) {
+ pr_err("EFA version is lower than the minimal version the driver supports\n");
+ return -1;
+ }
+
+ pr_info("efa controller version: %d.%d.%d implementation version %d\n",
+ (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_MASK) >>
+ EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_SHIFT,
+ (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_MASK) >>
+ EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_SHIFT,
+ (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_SUBMINOR_VERSION_MASK),
+ (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_IMPL_ID_MASK) >>
+ EFA_REGS_CONTROLLER_VERSION_IMPL_ID_SHIFT);
+
+ ctrl_ver_masked =
+ (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_MASK) |
+ (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_MASK) |
+ (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_SUBMINOR_VERSION_MASK);
+
+ /* Validate the ctrl version without the implementation ID */
+ if (ctrl_ver_masked < MIN_EFA_CTRL_VER) {
+ pr_err("EFA ctrl version is lower than the minimal ctrl version the driver supports\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * efa_com_get_dma_width - Retrieve physical dma address width the device
+ * supports.
+ * @edev: EFA communication layer struct
+ *
+ * Retrieve the maximum physical address bits the device can handle.
+ *
+ * @return: > 0 on Success and negative value otherwise.
+ */
+int efa_com_get_dma_width(struct efa_com_dev *edev)
+{
+ u32 caps = efa_com_reg_read32(edev, EFA_REGS_CAPS_OFF);
+ int width;
+
+ width = (caps & EFA_REGS_CAPS_DMA_ADDR_WIDTH_MASK) >>
+ EFA_REGS_CAPS_DMA_ADDR_WIDTH_SHIFT;
+
+ pr_debug("EFA dma width: %d\n", width);
+
+ if (width < 32 || width > 64) {
+ pr_err("DMA width illegal value: %d\n", width);
+ return -EINVAL;
+ }
+
+ edev->dma_addr_bits = width;
+
+ return width;
+}
+
+static int wait_for_reset_state(struct efa_com_dev *edev, u32 timeout,
+ u16 exp_state)
+{
+ u32 val, i;
+
+ for (i = 0; i < timeout; i++) {
+ val = efa_com_reg_read32(edev, EFA_REGS_DEV_STS_OFF);
+
+ if ((val & EFA_REGS_DEV_STS_RESET_IN_PROGRESS_MASK) ==
+ exp_state)
+ return 0;
+
+ pr_debug("reset indication val %d\n", val);
+ msleep(EFA_POLL_INTERVAL_MS);
+ }
+
+ return -ETIME;
+}
+
+/*
+ * efa_com_dev_reset - Perform device FLR to the device.
+ * @edev: EFA communication layer struct
+ * @reset_reason: Specify what is the trigger for the reset in case of an error.
+ *
+ * @return - 0 on success, negative value on failure.
+ */
+int efa_com_dev_reset(struct efa_com_dev *edev,
+ enum efa_regs_reset_reason_types reset_reason)
+{
+ u32 stat, timeout, cap, reset_val;
+ int err;
+
+ stat = efa_com_reg_read32(edev, EFA_REGS_DEV_STS_OFF);
+ cap = efa_com_reg_read32(edev, EFA_REGS_CAPS_OFF);
+
+ if (!(stat & EFA_REGS_DEV_STS_READY_MASK)) {
+ pr_err("Device isn't ready, can't reset device\n");
+ return -EINVAL;
+ }
+
+ timeout = (cap & EFA_REGS_CAPS_RESET_TIMEOUT_MASK) >>
+ EFA_REGS_CAPS_RESET_TIMEOUT_SHIFT;
+ if (!timeout) {
+ pr_err("Invalid timeout value\n");
+ return -EINVAL;
+ }
+
+ /* start reset */
+ reset_val = EFA_REGS_DEV_CTL_DEV_RESET_MASK;
+ reset_val |= (reset_reason << EFA_REGS_DEV_CTL_RESET_REASON_SHIFT) &
+ EFA_REGS_DEV_CTL_RESET_REASON_MASK;
+ writel(reset_val, edev->reg_bar + EFA_REGS_DEV_CTL_OFF);
+
+ /* reset clears the mmio readless address, restore it */
+ efa_com_mmio_reg_read_resp_addr_init(edev);
+
+ err = wait_for_reset_state(edev, timeout,
+ EFA_REGS_DEV_STS_RESET_IN_PROGRESS_MASK);
+ if (err) {
+ pr_err("Reset indication didn't turn on\n");
+ return err;
+ }
+
+ /* reset done */
+ writel(0, edev->reg_bar + EFA_REGS_DEV_CTL_OFF);
+ err = wait_for_reset_state(edev, timeout, 0);
+ if (err) {
+ pr_err("Reset indication didn't turn off\n");
+ return err;
+ }
+
+ timeout = (cap & EFA_REGS_CAPS_ADMIN_CMD_TO_MASK) >>
+ EFA_REGS_CAPS_ADMIN_CMD_TO_SHIFT;
+ if (timeout)
+ /* the resolution of timeout reg is 100ms */
+ edev->admin_queue.completion_timeout = timeout * 100000;
+ else
+ edev->admin_queue.completion_timeout = ADMIN_CMD_TIMEOUT_US;
+
+ return 0;
+}
+
Add admin commands submissions/completions implementation. Signed-off-by: Gal Pressman <galpress@amazon.com> --- drivers/infiniband/hw/efa/efa_com.c | 1122 +++++++++++++++++++++++++++++++++++ 1 file changed, 1122 insertions(+) create mode 100644 drivers/infiniband/hw/efa/efa_com.c