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mlxsw: pci: Add support for performing bus reset

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This is a preparation stage before introducing hot reload. During the
reload process the ASIC should be resetted by accessing the PCI BAR due
to unavailability of the mailbox/emad interfaces.

Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arkadi Sharshevsky 2018-01-15 08:59:06 +01:00 committed by David S. Miller
parent 56dc7cd0a8
commit 54a2e8d456
2 changed files with 41 additions and 13 deletions
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1
drivers/net/ethernet/mellanox/mlxsw/core.h
View file

@ -332,6 +332,7 @@ struct mlxsw_bus {
const struct mlxsw_config_profile *profile,
struct mlxsw_res *res);
void (*fini)(void *bus_priv);
void (*reset)(void *bus_priv);
bool (*skb_transmit_busy)(void *bus_priv,
const struct mlxsw_tx_info *tx_info);
int (*skb_transmit)(void *bus_priv, struct sk_buff *skb,

53
drivers/net/ethernet/mellanox/mlxsw/pci.c
View file

@ -154,6 +154,7 @@ struct mlxsw_pci {
} comp;
} cmd;
struct mlxsw_bus_info bus_info;
const struct pci_device_id *id;
};
static void mlxsw_pci_queue_tasklet_schedule(struct mlxsw_pci_queue *q)
@ -1622,16 +1623,6 @@ static int mlxsw_pci_cmd_exec(void *bus_priv, u16 opcode, u8 opcode_mod,
return err;
}
static const struct mlxsw_bus mlxsw_pci_bus = {
.kind = "pci",
.init = mlxsw_pci_init,
.fini = mlxsw_pci_fini,
.skb_transmit_busy = mlxsw_pci_skb_transmit_busy,
.skb_transmit = mlxsw_pci_skb_transmit,
.cmd_exec = mlxsw_pci_cmd_exec,
.features = MLXSW_BUS_F_TXRX,
};
static int mlxsw_pci_sw_reset(struct mlxsw_pci *mlxsw_pci,
const struct pci_device_id *id)
{
@ -1660,6 +1651,41 @@ static int mlxsw_pci_sw_reset(struct mlxsw_pci *mlxsw_pci,
return 0;
}
static void mlxsw_pci_free_irq_vectors(struct mlxsw_pci *mlxsw_pci)
{
pci_free_irq_vectors(mlxsw_pci->pdev);
}
static int mlxsw_pci_alloc_irq_vectors(struct mlxsw_pci *mlxsw_pci)
{
int err;
err = pci_alloc_irq_vectors(mlxsw_pci->pdev, 1, 1, PCI_IRQ_MSIX);
if (err < 0)
dev_err(&mlxsw_pci->pdev->dev, "MSI-X init failed\n");
return err;
}
static void mlxsw_pci_reset(void *bus_priv)
{
struct mlxsw_pci *mlxsw_pci = bus_priv;
mlxsw_pci_free_irq_vectors(mlxsw_pci);
mlxsw_pci_sw_reset(mlxsw_pci, mlxsw_pci->id);
mlxsw_pci_alloc_irq_vectors(mlxsw_pci);
}
static const struct mlxsw_bus mlxsw_pci_bus = {
.kind = "pci",
.init = mlxsw_pci_init,
.fini = mlxsw_pci_fini,
.skb_transmit_busy = mlxsw_pci_skb_transmit_busy,
.skb_transmit = mlxsw_pci_skb_transmit,
.cmd_exec = mlxsw_pci_cmd_exec,
.features = MLXSW_BUS_F_TXRX,
.reset = mlxsw_pci_reset,
};
static int mlxsw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
const char *driver_name = pdev->driver->name;
@ -1721,7 +1747,7 @@ static int mlxsw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
goto err_sw_reset;
}
err = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
err = mlxsw_pci_alloc_irq_vectors(mlxsw_pci);
if (err < 0) {
dev_err(&pdev->dev, "MSI-X init failed\n");
goto err_msix_init;
@ -1730,6 +1756,7 @@ static int mlxsw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
mlxsw_pci->bus_info.device_kind = driver_name;
mlxsw_pci->bus_info.device_name = pci_name(mlxsw_pci->pdev);
mlxsw_pci->bus_info.dev = &pdev->dev;
mlxsw_pci->id = id;
err = mlxsw_core_bus_device_register(&mlxsw_pci->bus_info,
&mlxsw_pci_bus, mlxsw_pci);
@ -1741,7 +1768,7 @@ static int mlxsw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
return 0;
err_bus_device_register:
pci_free_irq_vectors(mlxsw_pci->pdev);
mlxsw_pci_free_irq_vectors(mlxsw_pci);
err_msix_init:
err_sw_reset:
iounmap(mlxsw_pci->hw_addr);
@ -1761,7 +1788,7 @@ static void mlxsw_pci_remove(struct pci_dev *pdev)
struct mlxsw_pci *mlxsw_pci = pci_get_drvdata(pdev);
mlxsw_core_bus_device_unregister(mlxsw_pci->core);
pci_free_irq_vectors(mlxsw_pci->pdev);
mlxsw_pci_free_irq_vectors(mlxsw_pci);
iounmap(mlxsw_pci->hw_addr);
pci_release_regions(mlxsw_pci->pdev);
pci_disable_device(mlxsw_pci->pdev);