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Date: Thu, 30 Jan 2020 14:59:07 -0800
From: Jacob Keller <jacob.e.keller@...el.com>
To: netdev@...r.kernel.org
Cc: jiri@...nulli.us, valex@...lanox.com, linyunsheng@...wei.com,
lihong.yang@...el.com, Jacob Keller <jacob.e.keller@...el.com>
Subject: [PATCH 12/15] ice: add a devlink region to dump shadow RAM contents
Add a devlink region for exposing the device's Shadow RAM contents.
Support immediate snapshots by implementing the .snapshot callback.
Currently, no driver event triggers a snapshot automatically. Users must
request a snapshot via the new DEVLINK_CMD_REGION_TAKE_SNAPSHOT command.
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
---
drivers/net/ethernet/intel/ice/ice.h | 2 +
drivers/net/ethernet/intel/ice/ice_devlink.c | 120 +++++++++++++++++++
drivers/net/ethernet/intel/ice/ice_devlink.h | 3 +
drivers/net/ethernet/intel/ice/ice_main.c | 4 +
4 files changed, 129 insertions(+)
diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index a195135f840f..43deda152dd3 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -350,6 +350,8 @@ struct ice_pf {
/* devlink port data */
struct devlink_port devlink_port;
+ struct devlink_region *sr_region;
+
/* OS reserved IRQ details */
struct msix_entry *msix_entries;
struct ice_res_tracker *irq_tracker;
diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
index 3a98f241ccee..9f6a0281fd6e 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
@@ -5,6 +5,26 @@
#include "ice_lib.h"
#include "ice_devlink.h"
+/**
+ * ice_is_primary_devlink - Check if this is the primary devlink instance
+ * @pf: the PF device to check
+ *
+ * The ice hardware is represented by a multi-function PCIe device. This
+ * function is used to check whether this PF is function zero. Certain devlink
+ * features will call this function and only be enabled if it returns true.
+ */
+static bool ice_is_primary_function(struct ice_pf *pf)
+{
+ struct ice_hw *hw = &pf->hw;
+ u8 pf_id;
+
+ /* the hw->pf_id may not always be set when this function is called */
+ pf_id = (u8)(rd32(hw, PF_FUNC_RID) & PF_FUNC_RID_FUNC_NUM_M) >>
+ PF_FUNC_RID_FUNC_NUM_S;
+
+ return (pf_id == 0);
+}
+
/**
* ice_devlink_info_get - .info_get devlink handler
* @devlink: devlink instance structure
@@ -203,3 +223,103 @@ void ice_devlink_destroy_port(struct ice_pf *pf)
devlink_port_type_clear(&pf->devlink_port);
devlink_port_unregister(&pf->devlink_port);
}
+
+/**
+ * ice_devlink_sr_snapshot - Capture a snapshot of the Shadow RAM contents
+ * @devlink: the devlink instance
+ * @region: pointer to the sr_region
+ * @extack: extended ACK response structure
+ *
+ * This function is called in response to the DEVLINK_CMD_REGION_TRIGGER for
+ * the shadow-ram devlink region. It captures a snapshot of the shadow ram
+ * contents. This snapshot can later be viewed via the devlink-region
+ * interface.
+ *
+ * @returns zero on success, and updates the data and destructor values.
+ * Returns a non-zero error code on failure.
+ */
+static int ice_devlink_sr_snapshot(struct devlink *devlink,
+ struct netlink_ext_ack *extack,
+ u8 **data,
+ devlink_snapshot_data_dest_t **destructor)
+{
+ struct ice_pf *pf = devlink_priv(devlink);
+ struct device *dev = ice_pf_to_dev(pf);
+ struct ice_hw *hw = &pf->hw;
+ enum ice_status status;
+ void *sr_data;
+ u32 sr_size;
+
+ if (!ice_is_primary_function(pf))
+ return -EACCES;
+
+ sr_size = hw->nvm.sr_words * sizeof(u16);
+ sr_data = kzalloc(sr_size, GFP_KERNEL);
+ if (!sr_data) {
+ NL_SET_ERR_MSG_MOD(extack, "Out of memory");
+ return -ENOMEM;
+ }
+
+ status = ice_acquire_nvm(hw, ICE_RES_READ);
+ if (status) {
+ dev_dbg(dev, "ice_acquire_nvm failed, err %d aq_err %d\n",
+ status, hw->adminq.sq_last_status);
+ NL_SET_ERR_MSG_MOD(extack, "Failed to acquire NVM semaphore");
+ kfree(sr_data);
+ return -EIO;
+ }
+
+ status = ice_read_flat_nvm(hw, 0, &sr_size, sr_data, true);
+ if (status) {
+ dev_dbg(dev, "ice_read_flat_nvm failed after reading %u bytes, err %d aq_err %d\n",
+ sr_size, status, hw->adminq.sq_last_status);
+ NL_SET_ERR_MSG_MOD(extack, "Failed to read Shadow RAM contents");
+ ice_release_nvm(hw);
+ kfree(sr_data);
+ return -EIO;
+ }
+
+ ice_release_nvm(hw);
+
+ *data = sr_data;
+ *destructor = kfree;
+
+ return 0;
+}
+
+static const struct devlink_region_ops ice_sr_region_ops = {
+ .name = "shadow-ram",
+ .snapshot = ice_devlink_sr_snapshot,
+};
+
+/**
+ * ice_devlink_regions_init - Initialize devlink regions
+ * @pf: the PF device structure
+ *
+ * Create devlink regions used to enable access to dump the contents of the
+ * flash memory on the device.
+ */
+void ice_devlink_regions_init(struct ice_pf *pf)
+{
+ struct devlink *devlink = priv_to_devlink(pf);
+ struct device *dev = ice_pf_to_dev(pf);
+ u64 shadow_ram_size;
+
+ /* Regions which should be exported by all functions should be added
+ * above this check.
+ */
+ if (!ice_is_primary_function(pf))
+ return;
+
+ shadow_ram_size = pf->hw.nvm.sr_words * sizeof(u16);
+ pf->sr_region = devlink_region_create(devlink, &ice_sr_region_ops, 1,
+ shadow_ram_size);
+ if (IS_ERR(pf->sr_region))
+ dev_warn(dev, "failed to create shadow-ram devlink region, err %ld\n",
+ PTR_ERR(pf->sr_region));
+}
+
+void ice_devlink_regions_destroy(struct ice_pf *pf)
+{
+ devlink_region_destroy(pf->sr_region);
+}
diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.h b/drivers/net/ethernet/intel/ice/ice_devlink.h
index 5e34f6e1b57e..b1bacc922a5e 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.h
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.h
@@ -11,4 +11,7 @@ void ice_devlink_unregister(struct ice_pf *pf);
int ice_devlink_create_port(struct ice_pf *pf);
void ice_devlink_destroy_port(struct ice_pf *pf);
+void ice_devlink_regions_init(struct ice_pf *pf);
+void ice_devlink_regions_destroy(struct ice_pf *pf);
+
#endif /* _ICE_DEVLINK_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index a1aa4a1b6870..c20a8e761ca8 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3291,6 +3291,8 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
goto err_init_pf_unroll;
}
+ ice_devlink_regions_init(pf);
+
pf->num_alloc_vsi = hw->func_caps.guar_num_vsi;
if (!pf->num_alloc_vsi) {
err = -EIO;
@@ -3400,6 +3402,7 @@ ice_probe(struct pci_dev *pdev, const struct pci_device_id __always_unused *ent)
devm_kfree(dev, pf->vsi);
err_init_pf_unroll:
ice_deinit_pf(pf);
+ ice_devlink_regions_destroy(pf);
ice_deinit_hw(hw);
err_exit_unroll:
ice_devlink_unregister(pf);
@@ -3439,6 +3442,7 @@ static void ice_remove(struct pci_dev *pdev)
ice_vsi_free_q_vectors(pf->vsi[i]);
}
ice_deinit_pf(pf);
+ ice_devlink_regions_destroy(pf);
ice_deinit_hw(&pf->hw);
ice_devlink_unregister(pf);
--
2.25.0.rc1
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