[PATCH v2 net-next,3/8] octeontx2-af: modify FLR sequence for CPT

Srujana Challa
2023-01-11T12:24:45Z

The existing FLR sequence mentioned in HRM requires a dummy LMTST to CPT
but LMTST can't be submitted through BAR2 ALIAS registers. So, HW team
provided a new sequence to avoid dummy LMTST. This patch adds code for
the same.

Signed-off-by: Srujana Challa <schalla@marvell.com>
---
.../net/ethernet/marvell/octeontx2/af/rvu.h | 12 +++
.../ethernet/marvell/octeontx2/af/rvu_cpt.c | 86 +++++++++----------
.../ethernet/marvell/octeontx2/af/rvu_reg.h | 2 +
3 files changed, 53 insertions(+), 47 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
index 7f0a64731c67..20c75d7c962e 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
@@ -459,6 +459,7 @@ struct rvu {
struct rvu_pfvf *pf;
struct rvu_pfvf *hwvf;
struct mutex rsrc_lock; /* Serialize resource alloc/free */
+ struct mutex alias_lock; /* Serialize bar2 alias access */
int vfs; /* Number of VFs attached to RVU */
int nix_blkaddr[MAX_NIX_BLKS];

@@ -546,6 +547,17 @@ static inline u64 rvupf_read64(struct rvu *rvu, u64 offset)
return readq(rvu->pfreg_base + offset);
}

+static inline void rvu_bar2_sel_write64(struct rvu *rvu, u64 block, u64 offset, u64 val)
+{
+ /* HW requires read back of RVU_AF_BAR2_SEL register to make sure completion of
+ * write operation.
+ */
+ rvu_write64(rvu, block, offset, val);
+ rvu_read64(rvu, block, offset);
+ /* Barrier to ensure read completes before accessing LF registers */
+ mb();
+}
+
/* Silicon revisions */
static inline bool is_rvu_pre_96xx_C0(struct rvu *rvu)
{
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c
index 1cd34914cb86..e8973294c4f8 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cpt.c
@@ -930,68 +930,63 @@ static void cpt_rxc_teardown(struct rvu *rvu, int blkaddr)
dev_warn(rvu->dev, "Poll for RXC zombie count hits hard loop counter\n");
}

-#define INPROG_INFLIGHT(reg) ((reg) & 0x1FF)
-#define INPROG_GRB_PARTIAL(reg) ((reg) & BIT_ULL(31))
-#define INPROG_GRB(reg) (((reg) >> 32) & 0xFF)
-#define INPROG_GWB(reg) (((reg) >> 40) & 0xFF)
+#define INFLIGHT GENMASK_ULL(8, 0)
+#define GRB_CNT GENMASK_ULL(39, 32)
+#define GWB_CNT GENMASK_ULL(47, 40)
+#define XQ_XOR GENMASK_ULL(63, 63)
+#define DQPTR GENMASK_ULL(19, 0)
+#define NQPTR GENMASK_ULL(51, 32)

static void cpt_lf_disable_iqueue(struct rvu *rvu, int blkaddr, int slot)
{
- int i = 0, hard_lp_ctr = 100000;
- u64 inprog, grp_ptr;
- u16 nq_ptr, dq_ptr;
+ int timeout = 1000000;
+ u64 inprog, inst_ptr;
+ u64 qsize, pending;
+ int i = 0;

/* Disable instructions enqueuing */
rvu_write64(rvu, blkaddr, CPT_AF_BAR2_ALIASX(slot, CPT_LF_CTL), 0x0);

- /* Disable executions in the LF's queue */
inprog = rvu_read64(rvu, blkaddr,
CPT_AF_BAR2_ALIASX(slot, CPT_LF_INPROG));
- inprog &= ~BIT_ULL(16);
+ inprog |= BIT_ULL(16);
rvu_write64(rvu, blkaddr,
CPT_AF_BAR2_ALIASX(slot, CPT_LF_INPROG), inprog);

- /* Wait for CPT queue to become execution-quiescent */
+ qsize = rvu_read64(rvu, blkaddr,
+ CPT_AF_BAR2_ALIASX(slot, CPT_LF_Q_SIZE)) & 0x7FFF;
do {
- inprog = rvu_read64(rvu, blkaddr,
- CPT_AF_BAR2_ALIASX(slot, CPT_LF_INPROG));
- if (INPROG_GRB_PARTIAL(inprog)) {
- i = 0;
- hard_lp_ctr--;
- } else {
- i++;
- }
-
- grp_ptr = rvu_read64(rvu, blkaddr,
- CPT_AF_BAR2_ALIASX(slot,
- CPT_LF_Q_GRP_PTR));
- nq_ptr = (grp_ptr >> 32) & 0x7FFF;
- dq_ptr = grp_ptr & 0x7FFF;
-
- } while (hard_lp_ctr && (i < 10) && (nq_ptr != dq_ptr));
+ inst_ptr = rvu_read64(rvu, blkaddr,
+ CPT_AF_BAR2_ALIASX(slot, CPT_LF_Q_INST_PTR));
+ pending = (FIELD_GET(XQ_XOR, inst_ptr) * qsize * 40) +
+ FIELD_GET(NQPTR, inst_ptr) -
+ FIELD_GET(DQPTR, inst_ptr);
+ udelay(1);
+ timeout--;
+ } while ((pending != 0) && (timeout != 0));

- if (hard_lp_ctr == 0)
- dev_warn(rvu->dev, "CPT FLR hits hard loop counter\n");
+ if (timeout == 0)
+ dev_warn(rvu->dev, "TIMEOUT: CPT poll on pending instructions\n");

- i = 0;
- hard_lp_ctr = 100000;
+ timeout = 1000000;
+ /* Wait for CPT queue to become execution-quiescent */
do {
inprog = rvu_read64(rvu, blkaddr,
CPT_AF_BAR2_ALIASX(slot, CPT_LF_INPROG));

- if ((INPROG_INFLIGHT(inprog) == 0) &&
- (INPROG_GWB(inprog) < 40) &&
- ((INPROG_GRB(inprog) == 0) ||
- (INPROG_GRB((inprog)) == 40))) {
+ if ((FIELD_GET(INFLIGHT, inprog) == 0) &&
+ (FIELD_GET(GRB_CNT, inprog) == 0)) {
i++;
} else {
i = 0;
- hard_lp_ctr--;
+ timeout--;
}
- } while (hard_lp_ctr && (i < 10));
+ } while ((timeout != 0) && (i < 10));

- if (hard_lp_ctr == 0)
- dev_warn(rvu->dev, "CPT FLR hits hard loop counter\n");
+ if (timeout == 0)
+ dev_warn(rvu->dev, "TIMEOUT: CPT poll on inflight count\n");
+ /* Wait for 2 us to flush all queue writes to memory */
+ udelay(2);
}

int rvu_cpt_lf_teardown(struct rvu *rvu, u16 pcifunc, int blkaddr, int lf, int slot)
@@ -1001,18 +996,15 @@ int rvu_cpt_lf_teardown(struct rvu *rvu, u16 pcifunc, int blkaddr, int lf, int s
if (is_cpt_pf(rvu, pcifunc) || is_cpt_vf(rvu, pcifunc))
cpt_rxc_teardown(rvu, blkaddr);

+ mutex_lock(&rvu->alias_lock);
/* Enable BAR2 ALIAS for this pcifunc. */
reg = BIT_ULL(16) | pcifunc;
- rvu_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, reg);
+ rvu_bar2_sel_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, reg);

cpt_lf_disable_iqueue(rvu, blkaddr, slot);

- /* Set group drop to help clear out hardware */
- reg = rvu_read64(rvu, blkaddr, CPT_AF_BAR2_ALIASX(slot, CPT_LF_INPROG));
- reg |= BIT_ULL(17);
- rvu_write64(rvu, blkaddr, CPT_AF_BAR2_ALIASX(slot, CPT_LF_INPROG), reg);
-
- rvu_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, 0);
+ rvu_bar2_sel_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, 0);
+ mutex_unlock(&rvu->alias_lock);

return 0;
}
@@ -1147,7 +1139,7 @@ int rvu_cpt_ctx_flush(struct rvu *rvu, u16 pcifunc)

/* Enable BAR2 ALIAS for this pcifunc. */
reg = BIT_ULL(16) | pcifunc;
- rvu_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, reg);
+ rvu_bar2_sel_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, reg);

for (i = 0; i < max_ctx_entries; i++) {
cam_data = rvu_read64(rvu, blkaddr, CPT_AF_CTX_CAM_DATA(i));
@@ -1160,7 +1152,7 @@ int rvu_cpt_ctx_flush(struct rvu *rvu, u16 pcifunc)
reg);
}
}
- rvu_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, 0);
+ rvu_bar2_sel_write64(rvu, blkaddr, CPT_AF_BAR2_SEL, 0);

unlock:
mutex_unlock(&rvu->rsrc_lock);
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
index 0e0d536645ac..5437bd20c719 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
@@ -545,6 +545,8 @@

#define CPT_LF_CTL 0x10
#define CPT_LF_INPROG 0x40
+#define CPT_LF_Q_SIZE 0x100
+#define CPT_LF_Q_INST_PTR 0x110
#define CPT_LF_Q_GRP_PTR 0x120
#define CPT_LF_CTX_FLUSH 0x510

--
2.25.1