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-rw-r--r--drivers/net/mlx4/cmd.c429
1 files changed, 429 insertions, 0 deletions
diff --git a/drivers/net/mlx4/cmd.c b/drivers/net/mlx4/cmd.c
new file mode 100644
index 0000000..c1f81a9
--- /dev/null
+++ b/drivers/net/mlx4/cmd.c
@@ -0,0 +1,429 @@
+/*
+ * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * 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/sched.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+
+#include <linux/mlx4/cmd.h>
+
+#include <asm/io.h>
+
+#include "mlx4.h"
+
+#define CMD_POLL_TOKEN 0xffff
+
+enum {
+ /* command completed successfully: */
+ CMD_STAT_OK = 0x00,
+ /* Internal error (such as a bus error) occurred while processing command: */
+ CMD_STAT_INTERNAL_ERR = 0x01,
+ /* Operation/command not supported or opcode modifier not supported: */
+ CMD_STAT_BAD_OP = 0x02,
+ /* Parameter not supported or parameter out of range: */
+ CMD_STAT_BAD_PARAM = 0x03,
+ /* System not enabled or bad system state: */
+ CMD_STAT_BAD_SYS_STATE = 0x04,
+ /* Attempt to access reserved or unallocaterd resource: */
+ CMD_STAT_BAD_RESOURCE = 0x05,
+ /* Requested resource is currently executing a command, or is otherwise busy: */
+ CMD_STAT_RESOURCE_BUSY = 0x06,
+ /* Required capability exceeds device limits: */
+ CMD_STAT_EXCEED_LIM = 0x08,
+ /* Resource is not in the appropriate state or ownership: */
+ CMD_STAT_BAD_RES_STATE = 0x09,
+ /* Index out of range: */
+ CMD_STAT_BAD_INDEX = 0x0a,
+ /* FW image corrupted: */
+ CMD_STAT_BAD_NVMEM = 0x0b,
+ /* Attempt to modify a QP/EE which is not in the presumed state: */
+ CMD_STAT_BAD_QP_STATE = 0x10,
+ /* Bad segment parameters (Address/Size): */
+ CMD_STAT_BAD_SEG_PARAM = 0x20,
+ /* Memory Region has Memory Windows bound to: */
+ CMD_STAT_REG_BOUND = 0x21,
+ /* HCA local attached memory not present: */
+ CMD_STAT_LAM_NOT_PRE = 0x22,
+ /* Bad management packet (silently discarded): */
+ CMD_STAT_BAD_PKT = 0x30,
+ /* More outstanding CQEs in CQ than new CQ size: */
+ CMD_STAT_BAD_SIZE = 0x40
+};
+
+enum {
+ HCR_IN_PARAM_OFFSET = 0x00,
+ HCR_IN_MODIFIER_OFFSET = 0x08,
+ HCR_OUT_PARAM_OFFSET = 0x0c,
+ HCR_TOKEN_OFFSET = 0x14,
+ HCR_STATUS_OFFSET = 0x18,
+
+ HCR_OPMOD_SHIFT = 12,
+ HCR_T_BIT = 21,
+ HCR_E_BIT = 22,
+ HCR_GO_BIT = 23
+};
+
+enum {
+ GO_BIT_TIMEOUT = 10000
+};
+
+struct mlx4_cmd_context {
+ struct completion done;
+ int result;
+ int next;
+ u64 out_param;
+ u16 token;
+};
+
+static int mlx4_status_to_errno(u8 status) {
+ static const int trans_table[] = {
+ [CMD_STAT_INTERNAL_ERR] = -EIO,
+ [CMD_STAT_BAD_OP] = -EPERM,
+ [CMD_STAT_BAD_PARAM] = -EINVAL,
+ [CMD_STAT_BAD_SYS_STATE] = -ENXIO,
+ [CMD_STAT_BAD_RESOURCE] = -EBADF,
+ [CMD_STAT_RESOURCE_BUSY] = -EBUSY,
+ [CMD_STAT_EXCEED_LIM] = -ENOMEM,
+ [CMD_STAT_BAD_RES_STATE] = -EBADF,
+ [CMD_STAT_BAD_INDEX] = -EBADF,
+ [CMD_STAT_BAD_NVMEM] = -EFAULT,
+ [CMD_STAT_BAD_QP_STATE] = -EINVAL,
+ [CMD_STAT_BAD_SEG_PARAM] = -EFAULT,
+ [CMD_STAT_REG_BOUND] = -EBUSY,
+ [CMD_STAT_LAM_NOT_PRE] = -EAGAIN,
+ [CMD_STAT_BAD_PKT] = -EINVAL,
+ [CMD_STAT_BAD_SIZE] = -ENOMEM,
+ };
+
+ if (status >= ARRAY_SIZE(trans_table) ||
+ (status != CMD_STAT_OK && trans_table[status] == 0))
+ return -EIO;
+
+ return trans_table[status];
+}
+
+static int cmd_pending(struct mlx4_dev *dev)
+{
+ u32 status = readl(mlx4_priv(dev)->cmd.hcr + HCR_STATUS_OFFSET);
+
+ return (status & swab32(1 << HCR_GO_BIT)) ||
+ (mlx4_priv(dev)->cmd.toggle ==
+ !!(status & swab32(1 << HCR_T_BIT)));
+}
+
+static int mlx4_cmd_post(struct mlx4_dev *dev, u64 in_param, u64 out_param,
+ u32 in_modifier, u8 op_modifier, u16 op, u16 token,
+ int event)
+{
+ struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
+ u32 __iomem *hcr = cmd->hcr;
+ int ret = -EAGAIN;
+ unsigned long end;
+
+ mutex_lock(&cmd->hcr_mutex);
+
+ end = jiffies;
+ if (event)
+ end += HZ * 10;
+
+ while (cmd_pending(dev)) {
+ if (time_after_eq(jiffies, end))
+ goto out;
+ cond_resched();
+ }
+
+ /*
+ * We use writel (instead of something like memcpy_toio)
+ * because writes of less than 32 bits to the HCR don't work
+ * (and some architectures such as ia64 implement memcpy_toio
+ * in terms of writeb).
+ */
+ __raw_writel((__force u32) cpu_to_be32(in_param >> 32), hcr + 0);
+ __raw_writel((__force u32) cpu_to_be32(in_param & 0xfffffffful), hcr + 1);
+ __raw_writel((__force u32) cpu_to_be32(in_modifier), hcr + 2);
+ __raw_writel((__force u32) cpu_to_be32(out_param >> 32), hcr + 3);
+ __raw_writel((__force u32) cpu_to_be32(out_param & 0xfffffffful), hcr + 4);
+ __raw_writel((__force u32) cpu_to_be32(token << 16), hcr + 5);
+
+ /* __raw_writel may not order writes. */
+ wmb();
+
+ __raw_writel((__force u32) cpu_to_be32((1 << HCR_GO_BIT) |
+ (cmd->toggle << HCR_T_BIT) |
+ (event ? (1 << HCR_E_BIT) : 0) |
+ (op_modifier << HCR_OPMOD_SHIFT) |
+ op), hcr + 6);
+ cmd->toggle = cmd->toggle ^ 1;
+
+ ret = 0;
+
+out:
+ mutex_unlock(&cmd->hcr_mutex);
+ return ret;
+}
+
+static int mlx4_cmd_poll(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
+ int out_is_imm, u32 in_modifier, u8 op_modifier,
+ u16 op, unsigned long timeout)
+{
+ struct mlx4_priv *priv = mlx4_priv(dev);
+ void __iomem *hcr = priv->cmd.hcr;
+ int err = 0;
+ unsigned long end;
+
+ down(&priv->cmd.poll_sem);
+
+ err = mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
+ in_modifier, op_modifier, op, CMD_POLL_TOKEN, 0);
+ if (err)
+ goto out;
+
+ end = msecs_to_jiffies(timeout) + jiffies;
+ while (cmd_pending(dev) && time_before(jiffies, end))
+ cond_resched();
+
+ if (cmd_pending(dev)) {
+ err = -ETIMEDOUT;
+ goto out;
+ }
+
+ if (out_is_imm)
+ *out_param =
+ (u64) be32_to_cpu((__force __be32)
+ __raw_readl(hcr + HCR_OUT_PARAM_OFFSET)) << 32 |
+ (u64) be32_to_cpu((__force __be32)
+ __raw_readl(hcr + HCR_OUT_PARAM_OFFSET + 4));
+
+ err = mlx4_status_to_errno(be32_to_cpu((__force __be32)
+ __raw_readl(hcr + HCR_STATUS_OFFSET)) >> 24);
+
+out:
+ up(&priv->cmd.poll_sem);
+ return err;
+}
+
+void mlx4_cmd_event(struct mlx4_dev *dev, u16 token, u8 status, u64 out_param)
+{
+ struct mlx4_priv *priv = mlx4_priv(dev);
+ struct mlx4_cmd_context *context =
+ &priv->cmd.context[token & priv->cmd.token_mask];
+
+ /* previously timed out command completing at long last */
+ if (token != context->token)
+ return;
+
+ context->result = mlx4_status_to_errno(status);
+ context->out_param = out_param;
+
+ context->token += priv->cmd.token_mask + 1;
+
+ complete(&context->done);
+}
+
+static int mlx4_cmd_wait(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
+ int out_is_imm, u32 in_modifier, u8 op_modifier,
+ u16 op, unsigned long timeout)
+{
+ struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
+ struct mlx4_cmd_context *context;
+ int err = 0;
+
+ down(&cmd->event_sem);
+
+ spin_lock(&cmd->context_lock);
+ BUG_ON(cmd->free_head < 0);
+ context = &cmd->context[cmd->free_head];
+ cmd->free_head = context->next;
+ spin_unlock(&cmd->context_lock);
+
+ init_completion(&context->done);
+
+ mlx4_cmd_post(dev, in_param, out_param ? *out_param : 0,
+ in_modifier, op_modifier, op, context->token, 1);
+
+ if (!wait_for_completion_timeout(&context->done, msecs_to_jiffies(timeout))) {
+ err = -EBUSY;
+ goto out;
+ }
+
+ err = context->result;
+ if (err)
+ goto out;
+
+ if (out_is_imm)
+ *out_param = context->out_param;
+
+out:
+ spin_lock(&cmd->context_lock);
+ context->next = cmd->free_head;
+ cmd->free_head = context - cmd->context;
+ spin_unlock(&cmd->context_lock);
+
+ up(&cmd->event_sem);
+ return err;
+}
+
+int __mlx4_cmd(struct mlx4_dev *dev, u64 in_param, u64 *out_param,
+ int out_is_imm, u32 in_modifier, u8 op_modifier,
+ u16 op, unsigned long timeout)
+{
+ if (mlx4_priv(dev)->cmd.use_events)
+ return mlx4_cmd_wait(dev, in_param, out_param, out_is_imm,
+ in_modifier, op_modifier, op, timeout);
+ else
+ return mlx4_cmd_poll(dev, in_param, out_param, out_is_imm,
+ in_modifier, op_modifier, op, timeout);
+}
+EXPORT_SYMBOL_GPL(__mlx4_cmd);
+
+int mlx4_cmd_init(struct mlx4_dev *dev)
+{
+ struct mlx4_priv *priv = mlx4_priv(dev);
+
+ mutex_init(&priv->cmd.hcr_mutex);
+ sema_init(&priv->cmd.poll_sem, 1);
+ priv->cmd.use_events = 0;
+ priv->cmd.toggle = 1;
+
+ priv->cmd.hcr = ioremap(pci_resource_start(dev->pdev, 0) + MLX4_HCR_BASE,
+ MLX4_HCR_SIZE);
+ if (!priv->cmd.hcr) {
+ mlx4_err(dev, "Couldn't map command register.");
+ return -ENOMEM;
+ }
+
+ priv->cmd.pool = pci_pool_create("mlx4_cmd", dev->pdev,
+ MLX4_MAILBOX_SIZE,
+ MLX4_MAILBOX_SIZE, 0);
+ if (!priv->cmd.pool) {
+ iounmap(priv->cmd.hcr);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void mlx4_cmd_cleanup(struct mlx4_dev *dev)
+{
+ struct mlx4_priv *priv = mlx4_priv(dev);
+
+ pci_pool_destroy(priv->cmd.pool);
+ iounmap(priv->cmd.hcr);
+}
+
+/*
+ * Switch to using events to issue FW commands (can only be called
+ * after event queue for command events has been initialized).
+ */
+int mlx4_cmd_use_events(struct mlx4_dev *dev)
+{
+ struct mlx4_priv *priv = mlx4_priv(dev);
+ int i;
+
+ priv->cmd.context = kmalloc(priv->cmd.max_cmds *
+ sizeof (struct mlx4_cmd_context),
+ GFP_KERNEL);
+ if (!priv->cmd.context)
+ return -ENOMEM;
+
+ for (i = 0; i < priv->cmd.max_cmds; ++i) {
+ priv->cmd.context[i].token = i;
+ priv->cmd.context[i].next = i + 1;
+ }
+
+ priv->cmd.context[priv->cmd.max_cmds - 1].next = -1;
+ priv->cmd.free_head = 0;
+
+ sema_init(&priv->cmd.event_sem, priv->cmd.max_cmds);
+ spin_lock_init(&priv->cmd.context_lock);
+
+ for (priv->cmd.token_mask = 1;
+ priv->cmd.token_mask < priv->cmd.max_cmds;
+ priv->cmd.token_mask <<= 1)
+ ; /* nothing */
+ --priv->cmd.token_mask;
+
+ priv->cmd.use_events = 1;
+
+ down(&priv->cmd.poll_sem);
+
+ return 0;
+}
+
+/*
+ * Switch back to polling (used when shutting down the device)
+ */
+void mlx4_cmd_use_polling(struct mlx4_dev *dev)
+{
+ struct mlx4_priv *priv = mlx4_priv(dev);
+ int i;
+
+ priv->cmd.use_events = 0;
+
+ for (i = 0; i < priv->cmd.max_cmds; ++i)
+ down(&priv->cmd.event_sem);
+
+ kfree(priv->cmd.context);
+
+ up(&priv->cmd.poll_sem);
+}
+
+struct mlx4_cmd_mailbox *mlx4_alloc_cmd_mailbox(struct mlx4_dev *dev)
+{
+ struct mlx4_cmd_mailbox *mailbox;
+
+ mailbox = kmalloc(sizeof *mailbox, GFP_KERNEL);
+ if (!mailbox)
+ return ERR_PTR(-ENOMEM);
+
+ mailbox->buf = pci_pool_alloc(mlx4_priv(dev)->cmd.pool, GFP_KERNEL,
+ &mailbox->dma);
+ if (!mailbox->buf) {
+ kfree(mailbox);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return mailbox;
+}
+EXPORT_SYMBOL_GPL(mlx4_alloc_cmd_mailbox);
+
+void mlx4_free_cmd_mailbox(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox)
+{
+ if (!mailbox)
+ return;
+
+ pci_pool_free(mlx4_priv(dev)->cmd.pool, mailbox->buf, mailbox->dma);
+ kfree(mailbox);
+}
+EXPORT_SYMBOL_GPL(mlx4_free_cmd_mailbox);
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