1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_fwlog.c b/drivers/net/ethernet/intel/ice/ice_fwlog.c
index 25a17cbc1d34..92b5dac481cd 100644
--- a/drivers/net/ethernet/intel/ice/ice_fwlog.c
+++ b/drivers/net/ethernet/intel/ice/ice_fwlog.c
@@ -1,10 +1,128 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2022, Intel Corporation. */
 
+#include <linux/vmalloc.h>
 #include "ice.h"
 #include "ice_common.h"
 #include "ice_fwlog.h"
 
+bool ice_fwlog_ring_full(struct ice_fwlog_ring *rings)
+{
+	u16 head, tail;
+
+	head = rings->head;
+	tail = rings->tail;
+
+	if (head < tail && (tail - head == (rings->size - 1)))
+		return true;
+	else if (head > tail && (tail == (head - 1)))
+		return true;
+
+	return false;
+}
+
+bool ice_fwlog_ring_empty(struct ice_fwlog_ring *rings)
+{
+	return rings->head == rings->tail;
+}
+
+void ice_fwlog_ring_increment(u16 *item, u16 size)
+{
+	*item = (*item + 1) & (size - 1);
+}
+
+static int ice_fwlog_alloc_ring_buffs(struct ice_fwlog_ring *rings)
+{
+	int i, nr_bytes;
+	u8 *mem;
+
+	nr_bytes = rings->size * ICE_AQ_MAX_BUF_LEN;
+	mem = vzalloc(nr_bytes);
+	if (!mem)
+		return -ENOMEM;
+
+	for (i = 0; i < rings->size; i++) {
+		struct ice_fwlog_data *ring = &rings->rings[i];
+
+		ring->data_size = ICE_AQ_MAX_BUF_LEN;
+		ring->data = mem;
+		mem += ICE_AQ_MAX_BUF_LEN;
+	}
+
+	return 0;
+}
+
+static void ice_fwlog_free_ring_buffs(struct ice_fwlog_ring *rings)
+{
+	int i;
+
+	for (i = 0; i < rings->size; i++) {
+		struct ice_fwlog_data *ring = &rings->rings[i];
+
+		/* the first ring is the base memory for the whole range so
+		 * free it
+		 */
+		if (!i)
+			vfree(ring->data);
+
+		ring->data = NULL;
+		ring->data_size = 0;
+	}
+}
+
+#define ICE_FWLOG_INDEX_TO_BYTES(n) ((128 * 1024) << (n))
+/**
+ * ice_fwlog_realloc_rings - reallocate the FW log rings
+ * @hw: pointer to the HW structure
+ * @index: the new index to use to allocate memory for the log data
+ *
+ */
+void ice_fwlog_realloc_rings(struct ice_hw *hw, int index)
+{
+	struct ice_fwlog_ring ring;
+	int status, ring_size;
+
+	/* convert the number of bytes into a number of 4K buffers. externally
+	 * the driver presents the interface to the FW log data as a number of
+	 * bytes because that's easy for users to understand. internally the
+	 * driver uses a ring of buffers because the driver doesn't know where
+	 * the beginning and end of any line of log data is so the driver has
+	 * to overwrite data as complete blocks. when the data is returned to
+	 * the user the driver knows that the data is correct and the FW log
+	 * can be correctly parsed by the tools
+	 */
+	ring_size = ICE_FWLOG_INDEX_TO_BYTES(index) / ICE_AQ_MAX_BUF_LEN;
+	if (ring_size == hw->fwlog_ring.size)
+		return;
+
+	/* allocate space for the new rings and buffers then release the
+	 * old rings and buffers. that way if we don't have enough
+	 * memory then we at least have what we had before
+	 */
+	ring.rings = kcalloc(ring_size, sizeof(*ring.rings), GFP_KERNEL);
+	if (!ring.rings)
+		return;
+
+	ring.size = ring_size;
+
+	status = ice_fwlog_alloc_ring_buffs(&ring);
+	if (status) {
+		dev_warn(ice_hw_to_dev(hw), "Unable to allocate memory for FW log ring data buffers\n");
+		ice_fwlog_free_ring_buffs(&ring);
+		kfree(ring.rings);
+		return;
+	}
+
+	ice_fwlog_free_ring_buffs(&hw->fwlog_ring);
+	kfree(hw->fwlog_ring.rings);
+
+	hw->fwlog_ring.rings = ring.rings;
+	hw->fwlog_ring.size = ring.size;
+	hw->fwlog_ring.index = index;
+	hw->fwlog_ring.head = 0;
+	hw->fwlog_ring.tail = 0;
+}
+
 /**
  * ice_fwlog_init - Initialize FW logging configuration
  * @hw: pointer to the HW structure
@@ -28,6 +146,25 @@ int ice_fwlog_init(struct ice_hw *hw)
 		if (status)
 			return status;
 
+		hw->fwlog_ring.rings = kcalloc(ICE_FWLOG_RING_SIZE_DFLT,
+					       sizeof(*hw->fwlog_ring.rings),
+					       GFP_KERNEL);
+		if (!hw->fwlog_ring.rings) {
+			dev_warn(ice_hw_to_dev(hw), "Unable to allocate memory for FW log rings\n");
+			return -ENOMEM;
+		}
+
+		hw->fwlog_ring.size = ICE_FWLOG_RING_SIZE_DFLT;
+		hw->fwlog_ring.index = ICE_FWLOG_RING_SIZE_INDEX_DFLT;
+
+		status = ice_fwlog_alloc_ring_buffs(&hw->fwlog_ring);
+		if (status) {
+			dev_warn(ice_hw_to_dev(hw), "Unable to allocate memory for FW log ring data buffers\n");
+			ice_fwlog_free_ring_buffs(&hw->fwlog_ring);
+			kfree(hw->fwlog_ring.rings);
+			return status;
+		}
+
 		ice_debugfs_fwlog_init(hw->back);
 	} else {
 		dev_warn(ice_hw_to_dev(hw), "FW logging is not supported in this NVM image. Please update the NVM to get FW log support\n");
@@ -68,6 +205,11 @@ void ice_fwlog_deinit(struct ice_hw *hw)
 	if (status)
 		dev_warn(ice_hw_to_dev(hw), "Unable to unregister FW logging, status: %d\n",
 			 status);
+
+	if (hw->fwlog_ring.rings) {
+		ice_fwlog_free_ring_buffs(&hw->fwlog_ring);
+		kfree(hw->fwlog_ring.rings);
+	}
 }
 
 /**