qed: Add link support

Physical link is handled by the management Firmware.
This patch lays the infrastructure for attention handling in the driver,
as link change notifications arrive via async. attentions,
as well the handling of such notifications.

This patch also extends the API with the protocol drivers by adding
registered callbacks which the protocol driver passes to qed in order
to be notified of async. events originating from the FW/HW.

Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: Ariel Elior <Ariel.Elior@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 334 insertions, 2 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c
index 37d926a5fae5..2e399b6137a2 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_int.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_int.c
@@ -39,10 +39,214 @@ struct qed_sb_sp_info {
 	struct qed_pi_info	pi_info_arr[PIS_PER_SB];
 };
 
+#define SB_ATTN_ALIGNED_SIZE(p_hwfn) \
+	ALIGNED_TYPE_SIZE(struct atten_status_block, p_hwfn)
+
+#define ATTN_STATE_BITS (0xfff)
+#define ATTN_BITS_MASKABLE      (0x3ff)
+struct qed_sb_attn_info {
+	/* Virtual & Physical address of the SB */
+	struct atten_status_block       *sb_attn;
+	dma_addr_t		      sb_phys;
+
+	/* Last seen running index */
+	u16			     index;
+
+	/* Previously asserted attentions, which are still unasserted */
+	u16			     known_attn;
+
+	/* Cleanup address for the link's general hw attention */
+	u32			     mfw_attn_addr;
+};
+
+static inline u16 qed_attn_update_idx(struct qed_hwfn *p_hwfn,
+				      struct qed_sb_attn_info   *p_sb_desc)
+{
+	u16     rc = 0;
+	u16     index;
+
+	/* Make certain HW write took affect */
+	mmiowb();
+
+	index = le16_to_cpu(p_sb_desc->sb_attn->sb_index);
+	if (p_sb_desc->index != index) {
+		p_sb_desc->index	= index;
+		rc		      = QED_SB_ATT_IDX;
+	}
+
+	/* Make certain we got a consistent view with HW */
+	mmiowb();
+
+	return rc;
+}
+
+/**
+ *  @brief qed_int_assertion - handles asserted attention bits
+ *
+ *  @param p_hwfn
+ *  @param asserted_bits newly asserted bits
+ *  @return int
+ */
+static int qed_int_assertion(struct qed_hwfn *p_hwfn,
+			     u16 asserted_bits)
+{
+	struct qed_sb_attn_info *sb_attn_sw = p_hwfn->p_sb_attn;
+	u32 igu_mask;
+
+	/* Mask the source of the attention in the IGU */
+	igu_mask = qed_rd(p_hwfn, p_hwfn->p_dpc_ptt,
+			  IGU_REG_ATTENTION_ENABLE);
+	DP_VERBOSE(p_hwfn, NETIF_MSG_INTR, "IGU mask: 0x%08x --> 0x%08x\n",
+		   igu_mask, igu_mask & ~(asserted_bits & ATTN_BITS_MASKABLE));
+	igu_mask &= ~(asserted_bits & ATTN_BITS_MASKABLE);
+	qed_wr(p_hwfn, p_hwfn->p_dpc_ptt, IGU_REG_ATTENTION_ENABLE, igu_mask);
+
+	DP_VERBOSE(p_hwfn, NETIF_MSG_INTR,
+		   "inner known ATTN state: 0x%04x --> 0x%04x\n",
+		   sb_attn_sw->known_attn,
+		   sb_attn_sw->known_attn | asserted_bits);
+	sb_attn_sw->known_attn |= asserted_bits;
+
+	/* Handle MCP events */
+	if (asserted_bits & 0x100) {
+		qed_mcp_handle_events(p_hwfn, p_hwfn->p_dpc_ptt);
+		/* Clean the MCP attention */
+		qed_wr(p_hwfn, p_hwfn->p_dpc_ptt,
+		       sb_attn_sw->mfw_attn_addr, 0);
+	}
+
+	DIRECT_REG_WR((u8 __iomem *)p_hwfn->regview +
+		      GTT_BAR0_MAP_REG_IGU_CMD +
+		      ((IGU_CMD_ATTN_BIT_SET_UPPER -
+			IGU_CMD_INT_ACK_BASE) << 3),
+		      (u32)asserted_bits);
+
+	DP_VERBOSE(p_hwfn, NETIF_MSG_INTR, "set cmd IGU: 0x%04x\n",
+		   asserted_bits);
+
+	return 0;
+}
+
+/**
+ * @brief - handles deassertion of previously asserted attentions.
+ *
+ * @param p_hwfn
+ * @param deasserted_bits - newly deasserted bits
+ * @return int
+ *
+ */
+static int qed_int_deassertion(struct qed_hwfn  *p_hwfn,
+			       u16 deasserted_bits)
+{
+	struct qed_sb_attn_info *sb_attn_sw = p_hwfn->p_sb_attn;
+	u32 aeu_mask;
+
+	if (deasserted_bits != 0x100)
+		DP_ERR(p_hwfn, "Unexpected - non-link deassertion\n");
+
+	/* Clear IGU indication for the deasserted bits */
+	DIRECT_REG_WR((u8 __iomem *)p_hwfn->regview +
+		      GTT_BAR0_MAP_REG_IGU_CMD +
+		      ((IGU_CMD_ATTN_BIT_CLR_UPPER -
+			IGU_CMD_INT_ACK_BASE) << 3),
+		      ~((u32)deasserted_bits));
+
+	/* Unmask deasserted attentions in IGU */
+	aeu_mask = qed_rd(p_hwfn, p_hwfn->p_dpc_ptt,
+			  IGU_REG_ATTENTION_ENABLE);
+	aeu_mask |= (deasserted_bits & ATTN_BITS_MASKABLE);
+	qed_wr(p_hwfn, p_hwfn->p_dpc_ptt, IGU_REG_ATTENTION_ENABLE, aeu_mask);
+
+	/* Clear deassertion from inner state */
+	sb_attn_sw->known_attn &= ~deasserted_bits;
+
+	return 0;
+}
+
+static int qed_int_attentions(struct qed_hwfn *p_hwfn)
+{
+	struct qed_sb_attn_info *p_sb_attn_sw = p_hwfn->p_sb_attn;
+	struct atten_status_block *p_sb_attn = p_sb_attn_sw->sb_attn;
+	u32 attn_bits = 0, attn_acks = 0;
+	u16 asserted_bits, deasserted_bits;
+	__le16 index;
+	int rc = 0;
+
+	/* Read current attention bits/acks - safeguard against attentions
+	 * by guaranting work on a synchronized timeframe
+	 */
+	do {
+		index = p_sb_attn->sb_index;
+		attn_bits = le32_to_cpu(p_sb_attn->atten_bits);
+		attn_acks = le32_to_cpu(p_sb_attn->atten_ack);
+	} while (index != p_sb_attn->sb_index);
+	p_sb_attn->sb_index = index;
+
+	/* Attention / Deassertion are meaningful (and in correct state)
+	 * only when they differ and consistent with known state - deassertion
+	 * when previous attention & current ack, and assertion when current
+	 * attention with no previous attention
+	 */
+	asserted_bits = (attn_bits & ~attn_acks & ATTN_STATE_BITS) &
+		~p_sb_attn_sw->known_attn;
+	deasserted_bits = (~attn_bits & attn_acks & ATTN_STATE_BITS) &
+		p_sb_attn_sw->known_attn;
+
+	if ((asserted_bits & ~0x100) || (deasserted_bits & ~0x100)) {
+		DP_INFO(p_hwfn,
+			"Attention: Index: 0x%04x, Bits: 0x%08x, Acks: 0x%08x, asserted: 0x%04x, De-asserted 0x%04x [Prev. known: 0x%04x]\n",
+			index, attn_bits, attn_acks, asserted_bits,
+			deasserted_bits, p_sb_attn_sw->known_attn);
+	} else if (asserted_bits == 0x100) {
+		DP_INFO(p_hwfn,
+			"MFW indication via attention\n");
+	} else {
+		DP_VERBOSE(p_hwfn, NETIF_MSG_INTR,
+			   "MFW indication [deassertion]\n");
+	}
+
+	if (asserted_bits) {
+		rc = qed_int_assertion(p_hwfn, asserted_bits);
+		if (rc)
+			return rc;
+	}
+
+	if (deasserted_bits) {
+		rc = qed_int_deassertion(p_hwfn, deasserted_bits);
+		if (rc)
+			return rc;
+	}
+
+	return rc;
+}
+
+static void qed_sb_ack_attn(struct qed_hwfn *p_hwfn,
+			    void __iomem *igu_addr,
+			    u32 ack_cons)
+{
+	struct igu_prod_cons_update igu_ack = { 0 };
+
+	igu_ack.sb_id_and_flags =
+		((ack_cons << IGU_PROD_CONS_UPDATE_SB_INDEX_SHIFT) |
+		 (1 << IGU_PROD_CONS_UPDATE_UPDATE_FLAG_SHIFT) |
+		 (IGU_INT_NOP << IGU_PROD_CONS_UPDATE_ENABLE_INT_SHIFT) |
+		 (IGU_SEG_ACCESS_ATTN <<
+		  IGU_PROD_CONS_UPDATE_SEGMENT_ACCESS_SHIFT));
+
+	DIRECT_REG_WR(igu_addr, igu_ack.sb_id_and_flags);
+
+	/* Both segments (interrupts & acks) are written to same place address;
+	 * Need to guarantee all commands will be received (in-order) by HW.
+	 */
+	mmiowb();
+	barrier();
+}
+
 void qed_int_sp_dpc(unsigned long hwfn_cookie)
 {
 	struct qed_hwfn *p_hwfn = (struct qed_hwfn *)hwfn_cookie;
 	struct qed_pi_info *pi_info = NULL;
+	struct qed_sb_attn_info *sb_attn;
 	struct qed_sb_info *sb_info;
 	int arr_size;
 	u16 rc = 0;
@@ -65,6 +269,12 @@ void qed_int_sp_dpc(unsigned long hwfn_cookie)
 		return;
 	}
 
+	if (!p_hwfn->p_sb_attn) {
+		DP_ERR(p_hwfn->cdev, "DPC called - no p_sb_attn");
+		return;
+	}
+	sb_attn = p_hwfn->p_sb_attn;
+
 	DP_VERBOSE(p_hwfn, NETIF_MSG_INTR, "DPC Called! (hwfn %p %d)\n",
 		   p_hwfn, p_hwfn->my_id);
 
@@ -87,6 +297,19 @@ void qed_int_sp_dpc(unsigned long hwfn_cookie)
 			   tmp_index, sb_info->sb_ack);
 	}
 
+	if (!sb_attn || !sb_attn->sb_attn) {
+		DP_ERR(
+			p_hwfn->cdev,
+			"Attentions Status block is NULL - cannot check for new attentions!\n");
+	} else {
+		u16 tmp_index = sb_attn->index;
+
+		rc |= qed_attn_update_idx(p_hwfn, sb_attn);
+		DP_VERBOSE(p_hwfn->cdev, NETIF_MSG_INTR,
+			   "Attention indices: 0x%08x --> 0x%08x\n",
+			   tmp_index, sb_attn->index);
+	}
+
 	/* Check if we expect interrupts at this time. if not just ack them */
 	if (!(rc & QED_SB_EVENT_MASK)) {
 		qed_sb_ack(sb_info, IGU_INT_ENABLE, 1);
@@ -100,6 +323,9 @@ void qed_int_sp_dpc(unsigned long hwfn_cookie)
 		return;
 	}
 
+	if (rc & QED_SB_ATT_IDX)
+		qed_int_attentions(p_hwfn);
+
 	if (rc & QED_SB_IDX) {
 		int pi;
 
@@ -111,9 +337,97 @@ void qed_int_sp_dpc(unsigned long hwfn_cookie)
 		}
 	}
 
+	if (sb_attn && (rc & QED_SB_ATT_IDX))
+		/* This should be done before the interrupts are enabled,
+		 * since otherwise a new attention will be generated.
+		 */
+		qed_sb_ack_attn(p_hwfn, sb_info->igu_addr, sb_attn->index);
+
 	qed_sb_ack(sb_info, IGU_INT_ENABLE, 1);
 }
 
+static void qed_int_sb_attn_free(struct qed_hwfn *p_hwfn)
+{
+	struct qed_dev *cdev   = p_hwfn->cdev;
+	struct qed_sb_attn_info *p_sb   = p_hwfn->p_sb_attn;
+
+	if (p_sb) {
+		if (p_sb->sb_attn)
+			dma_free_coherent(&cdev->pdev->dev,
+					  SB_ATTN_ALIGNED_SIZE(p_hwfn),
+					  p_sb->sb_attn,
+					  p_sb->sb_phys);
+		kfree(p_sb);
+	}
+}
+
+static void qed_int_sb_attn_setup(struct qed_hwfn *p_hwfn,
+				  struct qed_ptt *p_ptt)
+{
+	struct qed_sb_attn_info *sb_info = p_hwfn->p_sb_attn;
+
+	memset(sb_info->sb_attn, 0, sizeof(*sb_info->sb_attn));
+
+	sb_info->index = 0;
+	sb_info->known_attn = 0;
+
+	/* Configure Attention Status Block in IGU */
+	qed_wr(p_hwfn, p_ptt, IGU_REG_ATTN_MSG_ADDR_L,
+	       lower_32_bits(p_hwfn->p_sb_attn->sb_phys));
+	qed_wr(p_hwfn, p_ptt, IGU_REG_ATTN_MSG_ADDR_H,
+	       upper_32_bits(p_hwfn->p_sb_attn->sb_phys));
+}
+
+static void qed_int_sb_attn_init(struct qed_hwfn *p_hwfn,
+				 struct qed_ptt *p_ptt,
+				 void *sb_virt_addr,
+				 dma_addr_t sb_phy_addr)
+{
+	struct qed_sb_attn_info *sb_info = p_hwfn->p_sb_attn;
+
+	sb_info->sb_attn = sb_virt_addr;
+	sb_info->sb_phys = sb_phy_addr;
+
+	/* Set the address of cleanup for the mcp attention */
+	sb_info->mfw_attn_addr = (p_hwfn->rel_pf_id << 3) +
+				 MISC_REG_AEU_GENERAL_ATTN_0;
+
+	qed_int_sb_attn_setup(p_hwfn, p_ptt);
+}
+
+static int qed_int_sb_attn_alloc(struct qed_hwfn *p_hwfn,
+				 struct qed_ptt *p_ptt)
+{
+	struct qed_dev *cdev = p_hwfn->cdev;
+	struct qed_sb_attn_info *p_sb;
+	void *p_virt;
+	dma_addr_t p_phys = 0;
+
+	/* SB struct */
+	p_sb = kmalloc(sizeof(*p_sb), GFP_ATOMIC);
+	if (!p_sb) {
+		DP_NOTICE(cdev, "Failed to allocate `struct qed_sb_attn_info'\n");
+		return -ENOMEM;
+	}
+
+	/* SB ring  */
+	p_virt = dma_alloc_coherent(&cdev->pdev->dev,
+				    SB_ATTN_ALIGNED_SIZE(p_hwfn),
+				    &p_phys, GFP_KERNEL);
+
+	if (!p_virt) {
+		DP_NOTICE(cdev, "Failed to allocate status block (attentions)\n");
+		kfree(p_sb);
+		return -ENOMEM;
+	}
+
+	/* Attention setup */
+	p_hwfn->p_sb_attn = p_sb;
+	qed_int_sb_attn_init(p_hwfn, p_ptt, p_virt, p_phys);
+
+	return 0;
+}
+
 /* coalescing timeout = timeset << (timer_res + 1) */
 #define QED_CAU_DEF_RX_USECS 24
 #define QED_CAU_DEF_TX_USECS 48
@@ -394,6 +708,12 @@ static void qed_int_sp_sb_setup(struct qed_hwfn *p_hwfn,
 	else
 		DP_NOTICE(p_hwfn->cdev,
 			  "Failed to setup Slow path status block - NULL pointer\n");
+
+	if (p_hwfn->p_sb_attn)
+		qed_int_sb_attn_setup(p_hwfn, p_ptt);
+	else
+		DP_NOTICE(p_hwfn->cdev,
+			  "Failed to setup attentions status block - NULL pointer\n");
 }
 
 int qed_int_register_cb(struct qed_hwfn *p_hwfn,
@@ -444,7 +764,7 @@ void qed_int_igu_enable_int(struct qed_hwfn *p_hwfn,
 			    struct qed_ptt *p_ptt,
 			    enum qed_int_mode int_mode)
 {
-	u32 igu_pf_conf = IGU_PF_CONF_FUNC_EN;
+	u32 igu_pf_conf = IGU_PF_CONF_FUNC_EN | IGU_PF_CONF_ATTN_BIT_EN;
 
 	p_hwfn->cdev->int_mode = int_mode;
 	switch (p_hwfn->cdev->int_mode) {
@@ -484,8 +804,15 @@ void qed_int_igu_enable(struct qed_hwfn *p_hwfn,
 	/* Enable interrupt Generation */
 	qed_int_igu_enable_int(p_hwfn, p_ptt, int_mode);
 
+	/* Configure AEU signal change to produce attentions for link */
+	qed_wr(p_hwfn, p_ptt, IGU_REG_LEADING_EDGE_LATCH, 0xfff);
+	qed_wr(p_hwfn, p_ptt, IGU_REG_TRAILING_EDGE_LATCH, 0xfff);
+
 	/* Flush the writes to IGU */
 	mmiowb();
+
+	/* Unmask AEU signals toward IGU */
+	qed_wr(p_hwfn, p_ptt, MISC_REG_AEU_MASK_ATTN_IGU, 0xff);
 }
 
 void qed_int_igu_disable_int(struct qed_hwfn *p_hwfn,
@@ -770,13 +1097,18 @@ int qed_int_alloc(struct qed_hwfn *p_hwfn,
 		DP_ERR(p_hwfn->cdev, "Failed to allocate sp sb mem\n");
 		return rc;
 	}
-
+	rc = qed_int_sb_attn_alloc(p_hwfn, p_ptt);
+	if (rc) {
+		DP_ERR(p_hwfn->cdev, "Failed to allocate sb attn mem\n");
+		return rc;
+	}
 	return rc;
 }
 
 void qed_int_free(struct qed_hwfn *p_hwfn)
 {
 	qed_int_sp_sb_free(p_hwfn);
+	qed_int_sb_attn_free(p_hwfn);
 	qed_int_sp_dpc_free(p_hwfn);
 }