From: Alex Elder <elder@linaro.org>
To: davem@davemloft.net, kuba@kernel.org
Cc: elder@kernel.org, evgreen@chromium.org,
bjorn.andersson@linaro.org, cpratapa@codeaurora.org,
subashab@codeaurora.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 net-next 3/5] net: ipa: fix register write command validation
Date: Thu, 11 Feb 2021 15:19:25 -0600 [thread overview]
Message-ID: <20210211211927.28061-4-elder@linaro.org> (raw)
In-Reply-To: <20210211211927.28061-1-elder@linaro.org>
In ipa_cmd_register_write_valid() we verify that values we will
supply to a REGISTER_WRITE IPA immediate command will fit in
the fields that need to hold them. This patch fixes some issues
in that function and ipa_cmd_register_write_offset_valid().
The dev_err() call in ipa_cmd_register_write_offset_valid() has
some printf format errors:
- The name of the register (corresponding to the string format
specifier) was not supplied.
- The IPA base offset and offset need to be supplied separately to
match the other format specifiers.
Also make the ~0 constant used there to compute the maximum
supported offset value explicitly unsigned.
There are two other issues in ipa_cmd_register_write_valid():
- There's no need to check the hash flush register for platforms
(like IPA v4.2) that do not support hashed tables
- The highest possible endpoint number, whose status register
offset is computed, is COUNT - 1, not COUNT.
Fix these problems, and add some additional commentary.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/net/ipa/ipa_cmd.c | 32 ++++++++++++++++++++++++--------
1 file changed, 24 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ipa/ipa_cmd.c b/drivers/net/ipa/ipa_cmd.c
index 97b50fee60089..fd8bf6468d313 100644
--- a/drivers/net/ipa/ipa_cmd.c
+++ b/drivers/net/ipa/ipa_cmd.c
@@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
- * Copyright (C) 2019-2020 Linaro Ltd.
+ * Copyright (C) 2019-2021 Linaro Ltd.
*/
#include <linux/types.h>
@@ -244,11 +244,15 @@ static bool ipa_cmd_register_write_offset_valid(struct ipa *ipa,
if (ipa->version != IPA_VERSION_3_5_1)
bit_count += hweight32(REGISTER_WRITE_FLAGS_OFFSET_HIGH_FMASK);
BUILD_BUG_ON(bit_count > 32);
- offset_max = ~0 >> (32 - bit_count);
+ offset_max = ~0U >> (32 - bit_count);
+ /* Make sure the offset can be represented by the field(s)
+ * that holds it. Also make sure the offset is not outside
+ * the overall IPA memory range.
+ */
if (offset > offset_max || ipa->mem_offset > offset_max - offset) {
dev_err(dev, "%s offset too large 0x%04x + 0x%04x > 0x%04x)\n",
- ipa->mem_offset + offset, offset_max);
+ name, ipa->mem_offset, offset, offset_max);
return false;
}
@@ -261,12 +265,24 @@ static bool ipa_cmd_register_write_valid(struct ipa *ipa)
const char *name;
u32 offset;
- offset = ipa_reg_filt_rout_hash_flush_offset(ipa->version);
- name = "filter/route hash flush";
- if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
- return false;
+ /* If hashed tables are supported, ensure the hash flush register
+ * offset will fit in a register write IPA immediate command.
+ */
+ if (ipa->version != IPA_VERSION_4_2) {
+ offset = ipa_reg_filt_rout_hash_flush_offset(ipa->version);
+ name = "filter/route hash flush";
+ if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
+ return false;
+ }
- offset = IPA_REG_ENDP_STATUS_N_OFFSET(IPA_ENDPOINT_COUNT);
+ /* Each endpoint can have a status endpoint associated with it,
+ * and this is recorded in an endpoint register. If the modem
+ * crashes, we reset the status endpoint for all modem endpoints
+ * using a register write IPA immediate command. Make sure the
+ * worst case (highest endpoint number) offset of that endpoint
+ * fits in the register write command field(s) that must hold it.
+ */
+ offset = IPA_REG_ENDP_STATUS_N_OFFSET(IPA_ENDPOINT_COUNT - 1);
name = "maximal endpoint status";
if (!ipa_cmd_register_write_offset_valid(ipa, name, offset))
return false;
--
2.20.1
next prev parent reply other threads:[~2021-02-11 21:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 21:19 [PATCH v2 net-next 0/5] net: ipa: some more cleanup Alex Elder
2021-02-11 21:19 ` [PATCH v2 net-next 1/5] net: ipa: use a separate pointer for adjusted GSI memory Alex Elder
2021-02-11 21:19 ` [PATCH v2 net-next 2/5] net: ipa: don't report EPROBE_DEFER error Alex Elder
2021-02-11 22:11 ` Heiner Kallweit
2021-02-11 22:13 ` Alex Elder
2021-02-11 21:19 ` Alex Elder [this message]
2021-02-11 21:19 ` [PATCH v2 net-next 4/5] net: ipa: introduce ipa_table_hash_support() Alex Elder
2021-02-11 21:19 ` [PATCH v2 net-next 5/5] net: ipa: introduce gsi_channel_initialized() Alex Elder
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