| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20200720152831.931706551@linuxfoundation.org>
Date: Mon, 20 Jul 2020 17:36:39 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
"Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>,
Maulik Shah <mkshah@...eaurora.org>,
Douglas Anderson <dianders@...omium.org>,
Stephen Boyd <swboyd@...omium.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: [PATCH 5.7 128/244] soc: qcom: rpmh-rsc: Clear active mode configuration for wake TCS
From: Raju P.L.S.S.S.N <rplsssn@...eaurora.org>
commit 15b3bf61b8d48f8e0ccd9d7f1bcb468b543da396 upstream.
For RSCs that have sleep & wake TCS but no dedicated active TCS, wake
TCS can be re-purposed to send active requests. Once the active requests
are sent and response is received, the active mode configuration needs
to be cleared so that controller can use wake TCS for sending wake
requests.
Introduce enable_tcs_irq() to enable completion IRQ for repurposed TCSes.
Fixes: 2de4b8d33eab (drivers: qcom: rpmh-rsc: allow active requests from wake TCS)
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@...eaurora.org>
[mkshah: call enable_tcs_irq() within drv->lock, update commit message]
Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Link: https://lore.kernel.org/r/1586703004-13674-6-git-send-email-mkshah@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/soc/qcom/rpmh-rsc.c | 77 ++++++++++++++++++++++++++++++--------------
1 file changed, 54 insertions(+), 23 deletions(-)
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -201,6 +201,42 @@ static const struct tcs_request *get_req
return NULL;
}
+static void __tcs_set_trigger(struct rsc_drv *drv, int tcs_id, bool trigger)
+{
+ u32 enable;
+
+ /*
+ * HW req: Clear the DRV_CONTROL and enable TCS again
+ * While clearing ensure that the AMC mode trigger is cleared
+ * and then the mode enable is cleared.
+ */
+ enable = read_tcs_reg(drv, RSC_DRV_CONTROL, tcs_id, 0);
+ enable &= ~TCS_AMC_MODE_TRIGGER;
+ write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
+ enable &= ~TCS_AMC_MODE_ENABLE;
+ write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
+
+ if (trigger) {
+ /* Enable the AMC mode on the TCS and then trigger the TCS */
+ enable = TCS_AMC_MODE_ENABLE;
+ write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
+ enable |= TCS_AMC_MODE_TRIGGER;
+ write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
+ }
+}
+
+static void enable_tcs_irq(struct rsc_drv *drv, int tcs_id, bool enable)
+{
+ u32 data;
+
+ data = read_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, 0);
+ if (enable)
+ data |= BIT(tcs_id);
+ else
+ data &= ~BIT(tcs_id);
+ write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, data);
+}
+
/**
* tcs_tx_done: TX Done interrupt handler
*/
@@ -237,6 +273,14 @@ static irqreturn_t tcs_tx_done(int irq,
}
trace_rpmh_tx_done(drv, i, req, err);
+
+ /*
+ * If wake tcs was re-purposed for sending active
+ * votes, clear AMC trigger & enable modes and
+ * disable interrupt for this TCS
+ */
+ if (!drv->tcs[ACTIVE_TCS].num_tcs)
+ __tcs_set_trigger(drv, i, false);
skip:
/* Reclaim the TCS */
write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, i, 0);
@@ -244,6 +288,13 @@ skip:
write_tcs_reg(drv, RSC_DRV_IRQ_CLEAR, 0, BIT(i));
spin_lock(&drv->lock);
clear_bit(i, drv->tcs_in_use);
+ /*
+ * Disable interrupt for WAKE TCS to avoid being
+ * spammed with interrupts coming when the solver
+ * sends its wake votes.
+ */
+ if (!drv->tcs[ACTIVE_TCS].num_tcs)
+ enable_tcs_irq(drv, i, false);
spin_unlock(&drv->lock);
if (req)
rpmh_tx_done(req, err);
@@ -285,28 +336,6 @@ static void __tcs_buffer_write(struct rs
write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, tcs_id, cmd_enable);
}
-static void __tcs_trigger(struct rsc_drv *drv, int tcs_id)
-{
- u32 enable;
-
- /*
- * HW req: Clear the DRV_CONTROL and enable TCS again
- * While clearing ensure that the AMC mode trigger is cleared
- * and then the mode enable is cleared.
- */
- enable = read_tcs_reg(drv, RSC_DRV_CONTROL, tcs_id, 0);
- enable &= ~TCS_AMC_MODE_TRIGGER;
- write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
- enable &= ~TCS_AMC_MODE_ENABLE;
- write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
-
- /* Enable the AMC mode on the TCS and then trigger the TCS */
- enable = TCS_AMC_MODE_ENABLE;
- write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
- enable |= TCS_AMC_MODE_TRIGGER;
- write_tcs_reg_sync(drv, RSC_DRV_CONTROL, tcs_id, enable);
-}
-
static int check_for_req_inflight(struct rsc_drv *drv, struct tcs_group *tcs,
const struct tcs_request *msg)
{
@@ -377,10 +406,12 @@ static int tcs_write(struct rsc_drv *drv
tcs->req[tcs_id - tcs->offset] = msg;
set_bit(tcs_id, drv->tcs_in_use);
+ if (msg->state == RPMH_ACTIVE_ONLY_STATE && tcs->type != ACTIVE_TCS)
+ enable_tcs_irq(drv, tcs_id, true);
spin_unlock(&drv->lock);
__tcs_buffer_write(drv, tcs_id, 0, msg);
- __tcs_trigger(drv, tcs_id);
+ __tcs_set_trigger(drv, tcs_id, true);
done_write:
spin_unlock_irqrestore(&tcs->lock, flags);
Powered by blists - more mailing lists