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irqchip/gicv3-its: Add workaround for QDF2400 ITS erratum 0065

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commit 90922a2d03 upstream.

On Qualcomm Datacenter Technologies QDF2400 SoCs, the ITS hardware
implementation uses 16Bytes for Interrupt Translation Entry (ITE),
but reports an incorrect value of 8Bytes in GITS_TYPER.ITTE_size.

It might cause kernel memory corruption depending on the number
of MSI(x) that are configured and the amount of memory that has
been allocated for ITEs in its_create_device().

This patch fixes the potential memory corruption by setting the
correct ITE size to 16Bytes.

Cc: stable@vger.kernel.org
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shanker Donthineni
2017-03-07 08:20:38 -06:00
committed by Greg Kroah-Hartman
parent 61e79860b4
commit 095635be80
3 changed files with 49 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/arm64/silicon-errata.txt
View File

@@ -43,7 +43,7 @@ will be updated when new workarounds are committed and backported to
stable kernels.
| Implementor | Component | Erratum ID | Kconfig |
+----------------+-----------------+-----------------+-------------------------+
+----------------+-----------------+-----------------+-----------------------------+
| ARM | Cortex-A53 | #826319 | ARM64_ERRATUM_826319 |
| ARM | Cortex-A53 | #827319 | ARM64_ERRATUM_827319 |
| ARM | Cortex-A53 | #824069 | ARM64_ERRATUM_824069 |
@@ -63,3 +63,5 @@ stable kernels.
| Cavium | ThunderX SMMUv2 | #27704 | N/A |
| | | | |
| Freescale/NXP | LS2080A/LS1043A | A-008585 | FSL_ERRATUM_A008585 |
| | | | |
| Qualcomm Tech. | QDF2400 ITS | E0065 | QCOM_QDF2400_ERRATUM_0065 |

10
arch/arm64/Kconfig
View File

@@ -474,6 +474,16 @@ config CAVIUM_ERRATUM_27456
If unsure, say Y.
config QCOM_QDF2400_ERRATUM_0065
bool "QDF2400 E0065: Incorrect GITS_TYPER.ITT_Entry_size"
default y
help
On Qualcomm Datacenter Technologies QDF2400 SoC, ITS hardware reports
ITE size incorrectly. The GITS_TYPER.ITT_Entry_size field should have
been indicated as 16Bytes (0xf), not 8Bytes (0x7).
If unsure, say Y.
endmenu

16
drivers/irqchip/irq-gic-v3-its.c
View File

@@ -1598,6 +1598,14 @@ static void __maybe_unused its_enable_quirk_cavium_23144(void *data)
its->flags |= ITS_FLAGS_WORKAROUND_CAVIUM_23144;
}
static void __maybe_unused its_enable_quirk_qdf2400_e0065(void *data)
{
struct its_node *its = data;
/* On QDF2400, the size of the ITE is 16Bytes */
its->ite_size = 16;
}
static const struct gic_quirk its_quirks[] = {
#ifdef CONFIG_CAVIUM_ERRATUM_22375
{
@@ -1614,6 +1622,14 @@ static const struct gic_quirk its_quirks[] = {
.mask = 0xffff0fff,
.init = its_enable_quirk_cavium_23144,
},
#endif
#ifdef CONFIG_QCOM_QDF2400_ERRATUM_0065
{
.desc = "ITS: QDF2400 erratum 0065",
.iidr = 0x00001070, /* QDF2400 ITS rev 1.x */
.mask = 0xffffffff,
.init = its_enable_quirk_qdf2400_e0065,
},
#endif
{
}