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authorHaren Myneni <haren@linux.vnet.ibm.com>2018-06-13 10:32:40 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-08-07 17:32:34 +0300
commit656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca5 (patch)
tree31fc029fb2a6c3a6943fd9300dbf2d1a08316d48 /drivers/crypto
parent6e708000ec2c93c2bde6a46aa2d6c3e80d4eaeb9 (diff)
downloadlinux-656ecc16e8fc2ab44b3d70e3fcc197a7020d0ca5.tar.xz
crypto/nx: Initialize 842 high and normal RxFIFO control registers
NX increments readOffset by FIFO size in receive FIFO control register when CRB is read. But the index in RxFIFO has to match with the corresponding entry in FIFO maintained by VAS in kernel. Otherwise NX may be processing incorrect CRBs and can cause CRB timeout. VAS FIFO offset is 0 when the receive window is opened during initialization. When the module is reloaded or in kexec boot, readOffset in FIFO control register may not match with VAS entry. This patch adds nx_coproc_init OPAL call to reset readOffset and queued entries in FIFO control register for both high and normal FIFOs. Signed-off-by: Haren Myneni <haren@us.ibm.com> [mpe: Fixup uninitialized variable warning] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/nx/nx-842-powernv.c31
1 files changed, 28 insertions, 3 deletions
diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c
index 36afd6d8753c..c68df7e8bee1 100644
--- a/drivers/crypto/nx/nx-842-powernv.c
+++ b/drivers/crypto/nx/nx-842-powernv.c
@@ -24,6 +24,8 @@
#include <asm/icswx.h>
#include <asm/vas.h>
#include <asm/reg.h>
+#include <asm/opal-api.h>
+#include <asm/opal.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
@@ -753,7 +755,7 @@ static int nx842_open_percpu_txwins(void)
}
static int __init vas_cfg_coproc_info(struct device_node *dn, int chip_id,
- int vasid)
+ int vasid, int *ct)
{
struct vas_window *rxwin = NULL;
struct vas_rx_win_attr rxattr;
@@ -837,6 +839,15 @@ static int __init vas_cfg_coproc_info(struct device_node *dn, int chip_id,
coproc->vas.id = vasid;
nx842_add_coprocs_list(coproc, chip_id);
+ /*
+ * (lpid, pid, tid) combination has to be unique for each
+ * coprocessor instance in the system. So to make it
+ * unique, skiboot uses coprocessor type such as 842 or
+ * GZIP for pid and provides this value to kernel in pid
+ * device-tree property.
+ */
+ *ct = pid;
+
return 0;
err_out:
@@ -850,6 +861,7 @@ static int __init nx842_powernv_probe_vas(struct device_node *pn)
struct device_node *dn;
int chip_id, vasid, ret = 0;
int nx_fifo_found = 0;
+ int uninitialized_var(ct);
chip_id = of_get_ibm_chip_id(pn);
if (chip_id < 0) {
@@ -865,7 +877,7 @@ static int __init nx842_powernv_probe_vas(struct device_node *pn)
for_each_child_of_node(pn, dn) {
if (of_device_is_compatible(dn, "ibm,p9-nx-842")) {
- ret = vas_cfg_coproc_info(dn, chip_id, vasid);
+ ret = vas_cfg_coproc_info(dn, chip_id, vasid, &ct);
if (ret) {
of_node_put(dn);
return ret;
@@ -876,9 +888,22 @@ static int __init nx842_powernv_probe_vas(struct device_node *pn)
if (!nx_fifo_found) {
pr_err("NX842 FIFO nodes are missing\n");
- ret = -EINVAL;
+ return -EINVAL;
}
+ /*
+ * Initialize NX instance for both high and normal priority FIFOs.
+ */
+ if (opal_check_token(OPAL_NX_COPROC_INIT)) {
+ ret = opal_nx_coproc_init(chip_id, ct);
+ if (ret) {
+ pr_err("Failed to initialize NX for chip(%d): %d\n",
+ chip_id, ret);
+ ret = opal_error_code(ret);
+ }
+ } else
+ pr_warn("Firmware doesn't support NX initialization\n");
+
return ret;
}