[PATCH V4 00/11] Fix XPU violation during modem metadata authentication

[PATCH V4 00/11] Fix XPU violation during modem metadata authentication

[Sibi Sankar]

The memory region allocated using dma_alloc_attr with no kernel mapping
attribute set would still be a part of the linear kernel map. Any access
to this region by the application processor after assigning it to the
remote Q6 will result in a XPU violation. Fix this by replacing the
dynamically allocated memory region with a no-map carveout and unmap the
modem metadata memory region before passing control to the remote Q6.
The addition of the carveout and memunmap is required only on SoCs that
mandate memory protection before transferring control to Q6, hence the
driver falls back to dynamic memory allocation in the absence of the
modem metadata carveout.

V4:
 * Pickup Christoph's revert [Mani]
 * Use size/alloc-ranges instead of a specific address [Bjorn]
 * Include size checks
 * Pickup R-b

V3:
 * remove double space [Krzysztof]
 * Pickup R-bs
 * yaml description rewrite [Krzysztof]
 * fix compatible property [Krzysztof]
 * add blank lines and additionalProperties: false to mba/mpss
   objects
 * add blank lines and additionalProperties: false to mdata
   objects [Krzysztof]
 * Drop revert no_kernel_mapping since it's already on the list [Mani]
 * kfree metadata from the branch for parity

V2:
 * Convert legacy bindings to yaml
 * Revert no_kernel_mapping [Mani/Robin]
 * Pad commit message to explain bindings break [Krzysztof]
 * Split dt/bindings per SoC [Krzysztof]

Christoph Hellwig (1):
  Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region
    before/after use"

Sibi Sankar (10):
  dt-bindings: remoteproc: qcom,q6v5: Move MSM8996 to schema
  dt-bindings: remoteproc: qcom,msm8996-mss-pil: Update memory region
  dt-bindings: remoteproc: qcom,sc7180-mss-pil: Update memory-region
  dt-bindings: remoteproc: qcom,sc7280-mss-pil: Update memory-region
  remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem
    headers
  arm64: dts: qcom: msm8996: Add a carveout for modem metadata
  arm64: dts: qcom: msm8998: Add a carveout for modem metadata
  arm64: dts: qcom: sdm845: Add a carveout for modem metadata
  arm64: dts: qcom: sc7180: Add a carveout for modem metadata
  arm64: dts: qcom: sc7280: Add a carveout for modem metadata

 .../remoteproc/qcom,msm8996-mss-pil.yaml      | 393 ++++++++++++++++++
 .../bindings/remoteproc/qcom,q6v5.txt         | 137 +-----
 .../remoteproc/qcom,sc7180-mss-pil.yaml       |   3 +-
 .../remoteproc/qcom,sc7280-mss-pil.yaml       |   3 +-
 arch/arm64/boot/dts/qcom/msm8996.dtsi         |  10 +
 arch/arm64/boot/dts/qcom/msm8998.dtsi         |  10 +
 arch/arm64/boot/dts/qcom/sc7180-idp.dts       |   8 +-
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi  |   8 +-
 .../dts/qcom/sc7280-herobrine-lte-sku.dtsi    |   8 +-
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |  10 +
 drivers/remoteproc/qcom_q6v5_mss.c            |  87 ++--
 11 files changed, 507 insertions(+), 170 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml

-- 
2.17.1

[PATCH V4 01/11] dt-bindings: remoteproc: qcom,q6v5: Move MSM8996 to schema

[Sibi Sankar]

Convert MSM8996 and similar (MSM8998/SDM845) MSS PIL bindings to schema.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v3:
 * yaml description rewrite [Krzysztof]
 * fix compatible property [Krzysztof]
 * add blank lines and additionalProperties: false to
   mba/mpss objects
 * Pick R-b

 .../remoteproc/qcom,msm8996-mss-pil.yaml      | 377 ++++++++++++++++++
 .../bindings/remoteproc/qcom,q6v5.txt         | 137 +------
 2 files changed, 382 insertions(+), 132 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml

diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml
new file mode 100644
index 000000000000..1aa5e5c7c2bd
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml
@@ -0,0 +1,377 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/remoteproc/qcom,msm8996-mss-pil.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm MSM8996 MSS Peripheral Image Loader (and similar)
+
+maintainers:
+  - Bjorn Andersson <andersson@kernel.org>
+  - Sibi Sankar <quic_sibis@quicinc.com>
+
+description:
+  MSS Peripheral Image Loader loads and boots firmware on the
+  Qualcomm Technology Inc. MSM8996 Modem Hexagon Core (and similar).
+
+properties:
+  compatible:
+    enum:
+      - qcom,msm8996-mss-pil
+      - qcom,msm8998-mss-pil
+      - qcom,sdm845-mss-pil
+
+  reg:
+    items:
+      - description: MSS QDSP6 registers
+      - description: RMB registers
+
+  reg-names:
+    items:
+      - const: qdsp6
+      - const: rmb
+
+  iommus:
+    items:
+      - description: MSA Stream 1
+      - description: MSA Stream 2
+
+  interrupts:
+    items:
+      - description: Watchdog interrupt
+      - description: Fatal interrupt
+      - description: Ready interrupt
+      - description: Handover interrupt
+      - description: Stop acknowledge interrupt
+      - description: Shutdown acknowledge interrupt
+
+  interrupt-names:
+    items:
+      - const: wdog
+      - const: fatal
+      - const: ready
+      - const: handover
+      - const: stop-ack
+      - const: shutdown-ack
+
+  clocks:
+    minItems: 8
+    maxItems: 9
+
+  clock-names:
+    minItems: 8
+    maxItems: 9
+
+  power-domains:
+    items:
+      - description: CX power domain
+      - description: MX power domain
+      - description: MSS power domain (only valid for qcom,sdm845-mss-pil)
+    minItems: 2
+
+  power-domain-names:
+    items:
+      - const: cx
+      - const: mx
+      - const: mss # only valid for qcom,sdm845-mss-pil
+    minItems: 2
+
+  pll-supply:
+    description: PLL supply
+
+  resets:
+    items:
+      - description: AOSS restart
+      - description: PDC reset (only valid for qcom,sdm845-mss-pil)
+    minItems: 1
+
+  reset-names:
+    items:
+      - const: mss_restart
+      - const: pdc_reset # only valid for qcom,sdm845-mss-pil
+    minItems: 1
+
+  qcom,qmp:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Reference to the AOSS side-channel message RAM.
+
+  qcom,smem-states:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: States used by the AP to signal the Hexagon core
+    items:
+      - description: Stop modem
+
+  qcom,smem-state-names:
+    description: Names of the states used by the AP to signal the Hexagon core
+    items:
+      - const: stop
+
+  qcom,halt-regs:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      Halt registers are used to halt transactions of various sub-components
+      within MSS.
+    items:
+      - items:
+          - description: phandle to TCSR syscon region
+          - description: offset to the Q6 halt register
+          - description: offset to the modem halt register
+          - description: offset to the nc halt register
+
+  memory-region:
+    items:
+      - description: MBA reserved region
+      - description: Modem reserved region
+
+  firmware-name:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    items:
+      - description: Name of MBA firmware
+      - description: Name of modem firmware
+
+  smd-edge:
+    $ref: /schemas/remoteproc/qcom,smd-edge.yaml#
+    description:
+      Qualcomm Shared Memory subnode which represents communication edge,
+      channels and devices related to the Modem.
+    unevaluatedProperties: false
+
+  glink-edge:
+    $ref: /schemas/remoteproc/qcom,glink-edge.yaml#
+    description:
+      Qualcomm G-Link subnode which represents communication edge, channels
+      and devices related to the Modem.
+    unevaluatedProperties: false
+
+  # Deprecated properties
+  mba:
+    type: object
+    description:
+      MBA reserved region
+
+    properties:
+      memory-region: true
+
+    required:
+      - memory-region
+
+    additionalProperties: false
+    deprecated: true
+
+  mpss:
+    type: object
+    description:
+      MPSS reserved region
+
+    properties:
+      memory-region: true
+
+    required:
+      - memory-region
+
+    additionalProperties: false
+    deprecated: true
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+  - power-domains
+  - power-domain-names
+  - resets
+  - reset-names
+  - qcom,halt-regs
+  - qcom,smem-states
+  - qcom,smem-state-names
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          const: qcom,msm8996-mss-pil
+    then:
+      properties:
+        clocks:
+          items:
+            - description: GCC MSS IFACE clock
+            - description: GCC MSS BUS clock
+            - description: GCC MSS MEM clock
+            - description: RPMH XO clock
+            - description: GCC MSS GPLL0 clock
+            - description: GCC MSS SNOC_AXI clock
+            - description: GCC MSS MNOC_AXI clock
+            - description: RPMH PNOC clock
+            - description: GCC MSS PRNG clock
+            - description: RPMH QDSS clock
+        clock-names:
+          items:
+            - const: iface
+            - const: bus
+            - const: mem
+            - const: xo
+            - const: gpll0_mss
+            - const: snoc_axi
+            - const: mnoc_axi
+            - const: pnoc
+            - const: qdss
+        glink-edge: false
+      required:
+        - pll-supply
+        - smd-edge
+    else:
+      properties:
+        pll-supply: false
+        smd-edge: false
+
+  - if:
+      properties:
+        compatible:
+          const: qcom,msm8998-mss-pil
+    then:
+      properties:
+        clocks:
+          items:
+            - description: GCC MSS IFACE clock
+            - description: GCC MSS BUS clock
+            - description: GCC MSS MEM clock
+            - description: GCC MSS GPLL0 clock
+            - description: GCC MSS SNOC_AXI clock
+            - description: GCC MSS MNOC_AXI clock
+            - description: RPMH QDSS clock
+            - description: RPMH XO clock
+        clock-names:
+          items:
+            - const: iface
+            - const: bus
+            - const: mem
+            - const: gpll0_mss
+            - const: snoc_axi
+            - const: mnoc_axi
+            - const: qdss
+            - const: xo
+      required:
+        - glink-edge
+
+  - if:
+      properties:
+        compatible:
+          const: qcom,sdm845-mss-pil
+    then:
+      properties:
+        power-domains:
+          minItems: 3
+        power-domain-names:
+          minItems: 3
+        resets:
+          minItems: 2
+        reset-names:
+          minItems: 2
+        clocks:
+          items:
+            - description: GCC MSS IFACE clock
+            - description: GCC MSS BUS clock
+            - description: GCC MSS MEM clock
+            - description: GCC MSS GPLL0 clock
+            - description: GCC MSS SNOC_AXI clock
+            - description: GCC MSS MNOC_AXI clock
+            - description: GCC MSS PRNG clock
+            - description: RPMH XO clock
+        clock-names:
+          items:
+            - const: iface
+            - const: bus
+            - const: mem
+            - const: gpll0_mss
+            - const: snoc_axi
+            - const: mnoc_axi
+            - const: prng
+            - const: xo
+      required:
+        - qcom,qmp
+        - glink-edge
+    else:
+      properties:
+        iommus: false
+        power-domains:
+          maxItems: 2
+        power-domain-names:
+          maxItems: 2
+        resets:
+          maxItems: 1
+        reset-names:
+          maxItems: 1
+        qcom,qmp: false
+
+  # Fallbacks for deprecated properties
+  - oneOf:
+      - required:
+          - memory-region
+      - required:
+          - mba
+          - mpss
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/qcom,gcc-sdm845.h>
+    #include <dt-bindings/clock/qcom,rpmh.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/power/qcom-rpmpd.h>
+    #include <dt-bindings/reset/qcom,sdm845-aoss.h>
+    #include <dt-bindings/reset/qcom,sdm845-pdc.h>
+
+    remoteproc@4080000 {
+        compatible = "qcom,sdm845-mss-pil";
+        reg = <0x04080000 0x408>, <0x04180000 0x48>;
+        reg-names = "qdsp6", "rmb";
+
+        interrupts-extended = <&intc GIC_SPI 266 IRQ_TYPE_EDGE_RISING>,
+                              <&modem_smp2p_in 0 IRQ_TYPE_EDGE_RISING>,
+                              <&modem_smp2p_in 1 IRQ_TYPE_EDGE_RISING>,
+                              <&modem_smp2p_in 2 IRQ_TYPE_EDGE_RISING>,
+                              <&modem_smp2p_in 3 IRQ_TYPE_EDGE_RISING>,
+                              <&modem_smp2p_in 7 IRQ_TYPE_EDGE_RISING>;
+        interrupt-names = "wdog", "fatal", "ready", "handover", "stop-ack",
+                          "shutdown-ack";
+
+        clocks = <&gcc GCC_MSS_CFG_AHB_CLK>,
+                 <&gcc GCC_MSS_Q6_MEMNOC_AXI_CLK>,
+                 <&gcc GCC_BOOT_ROM_AHB_CLK>,
+                 <&gcc GCC_MSS_GPLL0_DIV_CLK_SRC>,
+                 <&gcc GCC_MSS_SNOC_AXI_CLK>,
+                 <&gcc GCC_MSS_MFAB_AXIS_CLK>,
+                 <&gcc GCC_PRNG_AHB_CLK>,
+                 <&rpmhcc RPMH_CXO_CLK>;
+        clock-names = "iface", "bus", "mem", "gpll0_mss",
+                      "snoc_axi", "mnoc_axi", "prng", "xo";
+
+        power-domains = <&rpmhpd SDM845_CX>,
+                        <&rpmhpd SDM845_MX>,
+                        <&rpmhpd SDM845_MSS>;
+        power-domain-names = "cx", "mx", "mss";
+
+        memory-region = <&mba_mem>, <&mpss_mem>;
+
+        resets = <&aoss_reset AOSS_CC_MSS_RESTART>,
+                 <&pdc_reset PDC_MODEM_SYNC_RESET>;
+        reset-names = "mss_restart", "pdc_reset";
+
+        qcom,halt-regs = <&tcsr_regs_1 0x3000 0x5000 0x4000>;
+
+        qcom,qmp = <&aoss_qmp>;
+
+        qcom,smem-states = <&modem_smp2p_out 0>;
+        qcom,smem-state-names = "stop";
+
+        glink-edge {
+            interrupts = <GIC_SPI 449 IRQ_TYPE_EDGE_RISING>;
+            label = "modem";
+            qcom,remote-pid = <1>;
+            mboxes = <&apss_shared 12>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
index 5923c0447e2d..573a88b60677 100644
--- a/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,q6v5.txt
@@ -9,9 +9,6 @@ on the Qualcomm Hexagon core.
 	Definition: must be one of:
 		    "qcom,ipq8074-wcss-pil"
 		    "qcom,qcs404-wcss-pil"
-		    "qcom,msm8996-mss-pil"
-		    "qcom,msm8998-mss-pil"
-		    "qcom,sdm845-mss-pil"
 
 - reg:
 	Usage: required
@@ -32,23 +29,7 @@ on the Qualcomm Hexagon core.
 - interrupt-names:
 	Usage: required
 	Value type: <stringlist>
-	Definition: The interrupts needed depends on the compatible
-		    string:
-	qcom,ipq8074-wcss-pil:
-	qcom,qcs404-wcss-pil:
-		    must be "wdog", "fatal", "ready", "handover", "stop-ack"
-	qcom,msm8996-mss-pil:
-	qcom,msm8998-mss-pil:
-	qcom,sdm845-mss-pil:
-		    must be "wdog", "fatal", "ready", "handover", "stop-ack",
-		    "shutdown-ack"
-
-- firmware-name:
-	Usage: optional
-	Value type: <stringlist>
-	Definition: must list the relative firmware image paths for mba and
-		    modem. They are used for booting and authenticating the
-		    Hexagon core.
+	Definition: must be "wdog", "fatal", "ready", "handover", "stop-ack"
 
 - clocks:
 	Usage: required
@@ -66,41 +47,23 @@ on the Qualcomm Hexagon core.
 		    "gcc_axim_cbcr", "lcc_ahbfabric_cbc", "tcsr_lcc_cbc",
 		    "lcc_abhs_cbc", "lcc_tcm_slave_cbc", "lcc_abhm_cbc",
 		    "lcc_axim_cbc", "lcc_bcr_sleep"
-	qcom,msm8996-mss-pil:
-		    must be "iface", "bus", "mem", "xo", "gpll0_mss",
-		    "snoc_axi", "mnoc_axi", "pnoc", "qdss"
-	qcom,msm8998-mss-pil:
-		    must be "iface", "bus", "mem", "xo", "gpll0_mss",
-		    "snoc_axi", "mnoc_axi", "qdss"
-	qcom,sdm845-mss-pil:
-		    must be "iface", "bus", "mem", "xo", "gpll0_mss",
-		    "snoc_axi", "mnoc_axi", "prng"
 
 - resets:
 	Usage: required
 	Value type: <phandle>
-	Definition: reference to the reset-controller for the modem sub-system
-		    reference to the list of 3 reset-controllers for the
+	Definition: reference to the list of 3 reset-controllers for the
 		    wcss sub-system
-		    reference to the list of 2 reset-controllers for the modem
-		    sub-system on SDM845 SoCs
 
 - reset-names:
 	Usage: required
 	Value type: <stringlist>
-	Definition: must be "mss_restart" for the modem sub-system
-		    must be "wcss_aon_reset", "wcss_reset", "wcss_q6_reset"
+	Definition: must be "wcss_aon_reset", "wcss_reset", "wcss_q6_reset"
 		    for the wcss sub-system
-		    must be "mss_restart", "pdc_reset" for the modem
-		    sub-system on SDM845 SoCs
 
-For devices where the mba and mpss sub-nodes are not specified, mba/mpss region
-should be referenced as follows:
 - memory-region:
 	Usage: required
 	Value type: <phandle>
-	Definition: reference to the reserved-memory for the mba region followed
-		    by the mpss region
+	Definition: reference to wcss reserved-memory region.
 
 For the compatible string below the following supplies are required:
   "qcom,qcs404-wcss-pil"
@@ -110,36 +73,6 @@ For the compatible string below the following supplies are required:
 	Definition: reference to the regulators to be held on behalf of the
 		    booting of the Hexagon core
 
-For the compatible string below the following supplies are required:
-  "qcom,msm8996-mss-pil"
-- pll-supply:
-	Usage: required
-	Value type: <phandle>
-	Definition: reference to the regulators to be held on behalf of the
-		    booting of the Hexagon core
-
-- power-domains:
-	Usage: required
-	Value type: <phandle>
-	Definition: reference to power-domains that match power-domain-names
-
-- power-domain-names:
-	Usage: required
-	Value type: <stringlist>
-	Definition: The power-domains needed depend on the compatible string:
-	qcom,ipq8074-wcss-pil:
-		    no power-domain names required
-	qcom,msm8996-mss-pil:
-	qcom,msm8998-mss-pil:
-		    must be "cx", "mx"
-	qcom,sdm845-mss-pil:
-		    must be "cx", "mx", "mss"
-
-- qcom,qmp:
-	Usage: optional
-	Value type: <phandle>
-	Definition: reference to the AOSS side-channel message RAM.
-
 - qcom,smem-states:
 	Usage: required
 	Value type: <phandle>
@@ -155,16 +88,9 @@ For the compatible string below the following supplies are required:
 	Usage: required
 	Value type: <prop-encoded-array>
 	Definition: a phandle reference to a syscon representing TCSR followed
-		    by the three offsets within syscon for q6, modem and nc
+		    by the three offsets within syscon for q6, wcss and nc
 		    halt registers.
 
-The Hexagon node must contain iommus property as described in ../iommu/iommu.txt
-on platforms which do not have TrustZone.
-
-= SUBNODES:
-The Hexagon node must contain two subnodes, named "mba" and "mpss" representing
-the memory regions used by the Hexagon firmware. Each sub-node must contain:
-
 - memory-region:
 	Usage: required
 	Value type: <phandle>
@@ -174,56 +100,3 @@ The Hexagon node may also have an subnode named either "smd-edge" or
 "glink-edge" that describes the communication edge, channels and devices
 related to the Hexagon.  See ../soc/qcom/qcom,smd.yaml and
 ../soc/qcom/qcom,glink.txt for details on how to describe these.
-
-= EXAMPLE
-The following example describes the resources needed to boot control the
-Hexagon, as it is found on MSM8974 boards.
-
-	remoteproc@fc880000 {
-		compatible = "qcom,msm8974-mss-pil";
-		reg = <0xfc880000 0x100>, <0xfc820000 0x020>;
-		reg-names = "qdsp6", "rmb";
-
-		interrupts-extended = <&intc GIC_SPI 24 IRQ_TYPE_EDGE_RISING>,
-				      <&modem_smp2p_in 0 IRQ_TYPE_EDGE_RISING>,
-				      <&modem_smp2p_in 1 IRQ_TYPE_EDGE_RISING>,
-				      <&modem_smp2p_in 2 IRQ_TYPE_EDGE_RISING>,
-				      <&modem_smp2p_in 3 IRQ_TYPE_EDGE_RISING>;
-		interrupt-names = "wdog", "fatal", "ready", "handover", "stop-ack";
-
-		clocks = <&gcc GCC_MSS_Q6_BIMC_AXI_CLK>,
-			 <&gcc GCC_MSS_CFG_AHB_CLK>,
-			 <&gcc GCC_BOOT_ROM_AHB_CLK>,
-			 <&xo_board>;
-		clock-names = "iface", "bus", "mem", "xo";
-
-		resets = <&gcc GCC_MSS_RESTART>;
-		reset-names = "mss_restart";
-
-		cx-supply = <&pm8841_s2>;
-		mss-supply = <&pm8841_s3>;
-		mx-supply = <&pm8841_s1>;
-		pll-supply = <&pm8941_l12>;
-
-		qcom,halt-regs = <&tcsr_mutex_block 0x1180 0x1200 0x1280>;
-
-		qcom,smem-states = <&modem_smp2p_out 0>;
-		qcom,smem-state-names = "stop";
-
-		mba {
-			memory-region = <&mba_region>;
-		};
-
-		mpss {
-			memory-region = <&mpss_region>;
-		};
-
-		smd-edge {
-			interrupts = <GIC_SPI 25 IRQ_TYPE_EDGE_RISING>;
-
-			qcom,ipc = <&apcs 8 12>;
-			qcom,smd-edge = <0>;
-
-			label = "modem";
-		};
-	};
-- 
2.17.1

[PATCH V4 02/11] dt-bindings: remoteproc: qcom,msm8996-mss-pil: Update memory region

[Sibi Sankar]

The dynamic memory region used for metadata authentication would still
be a part of the kernel mapping and any access to this region by the
application processor after assigning it to the remote Q6 will result
in a XPU violation. This is fixed by using a no-map carveout instead.
Update the bindings to reflect the addition of the new modem metadata
carveout on MSM8996 (and similar) SoCs.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v4:
 * Pickup R-b

v3:
 * add blank lines and additionalProperties: false to
   mdata objects [Krzysztof]

 .../remoteproc/qcom,msm8996-mss-pil.yaml       | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml
index 1aa5e5c7c2bd..c1ac6ca1e759 100644
--- a/Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,msm8996-mss-pil.yaml
@@ -122,6 +122,7 @@ properties:
     items:
       - description: MBA reserved region
       - description: Modem reserved region
+      - description: Metadata reserved region
 
   firmware-name:
     $ref: /schemas/types.yaml#/definitions/string-array
@@ -172,6 +173,20 @@ properties:
     additionalProperties: false
     deprecated: true
 
+  metadata:
+    type: object
+    description:
+      Metadata reserved region
+
+    properties:
+      memory-region: true
+
+    required:
+      - memory-region
+
+    additionalProperties: false
+    deprecated: true
+
 required:
   - compatible
   - reg
@@ -313,6 +328,7 @@ allOf:
       - required:
           - mba
           - mpss
+          - metadata
 
 additionalProperties: false
 
@@ -355,7 +371,7 @@ examples:
                         <&rpmhpd SDM845_MSS>;
         power-domain-names = "cx", "mx", "mss";
 
-        memory-region = <&mba_mem>, <&mpss_mem>;
+        memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
 
         resets = <&aoss_reset AOSS_CC_MSS_RESTART>,
                  <&pdc_reset PDC_MODEM_SYNC_RESET>;
-- 
2.17.1

[PATCH V4 03/11] dt-bindings: remoteproc: qcom,sc7180-mss-pil: Update memory-region

[Sibi Sankar]

The dynamic memory region used for metadata authentication would still
be a part of the kernel mapping and any access to this region by the
application processor after assigning it to the remote Q6 will result
in a XPU violation. This is fixed by using a no-map carveout instead.
Update the bindings to reflect the addition of the new modem metadata
carveout on SC7180 SoC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v3:
 * remove double space [Krzysztof]
 * Pickup R-b

v2:
 * Pad commit message to explain bindings break [Krzysztof]
 * Split dt/bindings per SoC  [Krzysztof]

 .../devicetree/bindings/remoteproc/qcom,sc7180-mss-pil.yaml    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,sc7180-mss-pil.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,sc7180-mss-pil.yaml
index e4a7da8020f4..b1402bef0ebe 100644
--- a/Documentation/devicetree/bindings/remoteproc/qcom,sc7180-mss-pil.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,sc7180-mss-pil.yaml
@@ -95,6 +95,7 @@ properties:
     items:
       - description: MBA reserved region
       - description: modem reserved region
+      - description: metadata reserved region
 
   firmware-name:
     $ref: /schemas/types.yaml#/definitions/string-array
@@ -223,7 +224,7 @@ examples:
                         <&rpmhpd SC7180_MSS>;
         power-domain-names = "cx", "mx", "mss";
 
-        memory-region = <&mba_mem>, <&mpss_mem>;
+        memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
 
         qcom,qmp = <&aoss_qmp>;
 
-- 
2.17.1

[PATCH V4 04/11] dt-bindings: remoteproc: qcom,sc7280-mss-pil: Update memory-region

[Sibi Sankar]

The dynamic memory region used for metadata authentication would still
be a part of the kernel mapping and any access to this region by the
application processor after assigning it to the remote Q6 will result
in a XPU violation. This is fixed by using a no-map carveout instead.
Update the bindings to reflect the addition of the new modem metadata
carveout on SC7280 SoC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v3:
 * remove double space [Krzysztof]
 * Pickup R-b

v2:
 * Pad commit message to explain bindings break [Krzysztof]
 * Split dt/bindings per SoC  [Krzysztof]

 .../devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml b/Documentation/devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml
index b4de0521a89d..005cb21732af 100644
--- a/Documentation/devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,sc7280-mss-pil.yaml
@@ -95,6 +95,7 @@ properties:
     items:
       - description: MBA reserved region
       - description: modem reserved region
+      - description: metadata reserved region
 
   firmware-name:
     $ref: /schemas/types.yaml#/definitions/string-array
@@ -240,7 +241,7 @@ examples:
                         <&rpmhpd SC7280_MSS>;
         power-domain-names = "cx", "mss";
 
-        memory-region = <&mba_mem>, <&mpss_mem>;
+        memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
 
         qcom,qmp = <&aoss_qmp>;
 
-- 
2.17.1

[PATCH V4 05/11] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"

[Sibi Sankar]

From: Christoph Hellwig <hch@lst.de>

This reverts commit fc156629b23a21181e473e60341e3a78af25a1d4.

This commit manages to do three API violations at once:

 - dereference the return value of dma_alloc_attrs with the
   DMA_ATTR_NO_KERNEL_MAPPING mapping, which is clearly forbidden and
   will do the wrong thing on various dma mapping implementations.  The
   fact that dma-direct uses a struct page as a cookie is an undocumented
   implementation detail
 - include dma-map-ops.h and use pgprot_dmacoherent despite a clear
   comment documenting that this is not acceptable
 - use of the VM_DMA_COHERENT for something that is not the dma-mapping
   code
 - use of VM_FLUSH_RESET_PERMS for vmap, while it is only supported for
   vmalloc

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---
 drivers/remoteproc/qcom_q6v5_mss.c | 38 +++++-------------------------
 1 file changed, 6 insertions(+), 32 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 2f4027664a0e..e2f765f87ec9 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -10,7 +10,6 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/devcoredump.h>
-#include <linux/dma-map-ops.h>
 #include <linux/dma-mapping.h>
 #include <linux/interrupt.h>
 #include <linux/kernel.h>
@@ -961,52 +960,27 @@ static void q6v5proc_halt_axi_port(struct q6v5 *qproc,
 static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw,
 				const char *fw_name)
 {
-	unsigned long dma_attrs = DMA_ATTR_FORCE_CONTIGUOUS | DMA_ATTR_NO_KERNEL_MAPPING;
-	unsigned long flags = VM_DMA_COHERENT | VM_FLUSH_RESET_PERMS;
-	struct page **pages;
-	struct page *page;
+	unsigned long dma_attrs = DMA_ATTR_FORCE_CONTIGUOUS;
 	dma_addr_t phys;
 	void *metadata;
 	int mdata_perm;
 	int xferop_ret;
 	size_t size;
-	void *vaddr;
-	int count;
+	void *ptr;
 	int ret;
-	int i;
 
 	metadata = qcom_mdt_read_metadata(fw, &size, fw_name, qproc->dev);
 	if (IS_ERR(metadata))
 		return PTR_ERR(metadata);
 
-	page = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
-	if (!page) {
+	ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
+	if (!ptr) {
 		kfree(metadata);
 		dev_err(qproc->dev, "failed to allocate mdt buffer\n");
 		return -ENOMEM;
 	}
 
-	count = PAGE_ALIGN(size) >> PAGE_SHIFT;
-	pages = kmalloc_array(count, sizeof(struct page *), GFP_KERNEL);
-	if (!pages) {
-		ret = -ENOMEM;
-		goto free_dma_attrs;
-	}
-
-	for (i = 0; i < count; i++)
-		pages[i] = nth_page(page, i);
-
-	vaddr = vmap(pages, count, flags, pgprot_dmacoherent(PAGE_KERNEL));
-	kfree(pages);
-	if (!vaddr) {
-		dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n", &phys, size);
-		ret = -EBUSY;
-		goto free_dma_attrs;
-	}
-
-	memcpy(vaddr, metadata, size);
-
-	vunmap(vaddr);
+	memcpy(ptr, metadata, size);
 
 	/* Hypervisor mapping to access metadata by modem */
 	mdata_perm = BIT(QCOM_SCM_VMID_HLOS);
@@ -1036,7 +1010,7 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw,
 			 "mdt buffer not reclaimed system may become unstable\n");
 
 free_dma_attrs:
-	dma_free_attrs(qproc->dev, size, page, phys, dma_attrs);
+	dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs);
 	kfree(metadata);
 
 	return ret < 0 ? ret : 0;
-- 
2.17.1

[PATCH V4 06/11] remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem headers

[Sibi Sankar]

Any access to the dynamically allocated metadata region by the application
processor after assigning it to the remote Q6 will result in a XPU
violation. Fix this by replacing the dynamically allocated memory region
with a no-map carveout and unmap the modem metadata memory region before
passing control to the remote Q6.

Reported-and-tested-by: Amit Pundir <amit.pundir@linaro.org>
Fixes: 6c5a9dc2481b ("remoteproc: qcom: Make secure world call for mem ownership switch")
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v4:
 * Use size/alloc-ranges instead of a specific address [Bjorn]
 * Include size checks

v3:
 * Drop revert no_kernel_mapping since it's already on the list [Mani]
 * kfree metadata from the branch for parity

 drivers/remoteproc/qcom_q6v5_mss.c | 59 +++++++++++++++++++++++++++---
 1 file changed, 53 insertions(+), 6 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index e2f765f87ec9..292e22f58df3 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
@@ -215,6 +216,9 @@ struct q6v5 {
 	size_t mba_size;
 	size_t dp_size;
 
+	phys_addr_t mdata_phys;
+	size_t mdata_size;
+
 	phys_addr_t mpss_phys;
 	phys_addr_t mpss_reloc;
 	size_t mpss_size;
@@ -973,15 +977,35 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw,
 	if (IS_ERR(metadata))
 		return PTR_ERR(metadata);
 
-	ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
-	if (!ptr) {
-		kfree(metadata);
-		dev_err(qproc->dev, "failed to allocate mdt buffer\n");
-		return -ENOMEM;
+	if (qproc->mdata_phys) {
+		if (size > qproc->mdata_size) {
+			ret = -EINVAL;
+			dev_err(qproc->dev, "metadata size outside memory range\n");
+			goto free_metadata;
+		}
+
+		phys = qproc->mdata_phys;
+		ptr = memremap(qproc->mdata_phys, size, MEMREMAP_WC);
+		if (!ptr) {
+			ret = -EBUSY;
+			dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n",
+				&qproc->mdata_phys, size);
+			goto free_metadata;
+		}
+	} else {
+		ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
+		if (!ptr) {
+			ret = -ENOMEM;
+			dev_err(qproc->dev, "failed to allocate mdt buffer\n");
+			goto free_metadata;
+		}
 	}
 
 	memcpy(ptr, metadata, size);
 
+	if (qproc->mdata_phys)
+		memunmap(ptr);
+
 	/* Hypervisor mapping to access metadata by modem */
 	mdata_perm = BIT(QCOM_SCM_VMID_HLOS);
 	ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm, false, true,
@@ -1010,7 +1034,9 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw,
 			 "mdt buffer not reclaimed system may become unstable\n");
 
 free_dma_attrs:
-	dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs);
+	if (!qproc->mdata_phys)
+		dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs);
+free_metadata:
 	kfree(metadata);
 
 	return ret < 0 ? ret : 0;
@@ -1847,6 +1873,7 @@ static int q6v5_init_reset(struct q6v5 *qproc)
 static int q6v5_alloc_memory_region(struct q6v5 *qproc)
 {
 	struct device_node *child;
+	struct reserved_mem *rmem;
 	struct device_node *node;
 	struct resource r;
 	int ret;
@@ -1893,6 +1920,26 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc)
 	qproc->mpss_phys = qproc->mpss_reloc = r.start;
 	qproc->mpss_size = resource_size(&r);
 
+	if (!child) {
+		node = of_parse_phandle(qproc->dev->of_node, "memory-region", 2);
+	} else {
+		child = of_get_child_by_name(qproc->dev->of_node, "metadata");
+		node = of_parse_phandle(child, "memory-region", 0);
+		of_node_put(child);
+	}
+
+	if (!node)
+		return 0;
+
+	rmem = of_reserved_mem_lookup(node);
+	if (!rmem) {
+		dev_err(qproc->dev, "unable to resolve metadata region\n");
+		return -EINVAL;
+	}
+
+	qproc->mdata_phys = rmem->base;
+	qproc->mdata_size = rmem->size;
+
 	return 0;
 }
 
-- 
2.17.1

[PATCH V4 07/11] arm64: dts: qcom: msm8996: Add a carveout for modem metadata

[Sibi Sankar]

Add a new carveout for modem metadata on MSM8996 SoCs.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v4:
 * Use size/alloc-ranges instead of a specific address [Bjorn]

v2:
 * Split dt/bindings per SoC [Krzysztof]

 arch/arm64/boot/dts/qcom/msm8996.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
index f4da50b2c007..68306b037d0c 100644
--- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
@@ -462,6 +462,12 @@
 			reg = <0x0 0x91500000 0x0 0x200000>;
 			no-map;
 		};
+
+		mdata_mem: mpss-metadata {
+			alloc-ranges = <0x0 0xa0000000 0x0 0x20000000>;
+			size = <0x0 0x4000>;
+			no-map;
+		};
 	};
 
 	rpm-glink {
@@ -2462,6 +2468,10 @@
 				memory-region = <&mpss_mem>;
 			};
 
+			metadata {
+				memory-region = <&mdata_mem>;
+			};
+
 			smd-edge {
 				interrupts = <GIC_SPI 449 IRQ_TYPE_EDGE_RISING>;
 
-- 
2.17.1

[PATCH V4 08/11] arm64: dts: qcom: msm8998: Add a carveout for modem metadata

[Sibi Sankar]

Add a new carveout for modem metadata on MSM8998 SoCs.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v4:
 * Use size/alloc-ranges instead of a specific address [Bjorn]

v2:
 * Split dt/bindings per SoC [Krzysztof]

 arch/arm64/boot/dts/qcom/msm8998.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi
index a527206f77e4..8bc1c59127e5 100644
--- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
@@ -108,6 +108,12 @@
 			reg = <0x0 0x95700000 0x0 0x100000>;
 			no-map;
 		};
+
+		mdata_mem: mpss-metadata {
+			alloc-ranges = <0x0 0xa0000000 0x0 0x20000000>;
+			size = <0x0 0x4000>;
+			no-map;
+		};
 	};
 
 	clocks {
@@ -1357,6 +1363,10 @@
 				memory-region = <&mpss_mem>;
 			};
 
+			metadata {
+				memory-region = <&mdata_mem>;
+			};
+
 			glink-edge {
 				interrupts = <GIC_SPI 452 IRQ_TYPE_EDGE_RISING>;
 				label = "modem";
-- 
2.17.1

[PATCH V4 09/11] arm64: dts: qcom: sdm845: Add a carveout for modem metadata

[Sibi Sankar]

Add a new carveout for modem metadata on SDM845 SoCs.

Tested-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v4:
 * Use size/alloc-ranges instead of a specific address [Bjorn]

v2:
 * Split dt/bindings per SoC [Krzysztof]

 arch/arm64/boot/dts/qcom/sdm845.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index 0f1cb2c8addd..18b9245879de 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -864,6 +864,12 @@
 			reg = <0 0x97b00000 0 0x100000>;
 			no-map;
 		};
+
+		mdata_mem: mpss-metadata {
+			alloc-ranges = <0 0xa0000000 0 0x20000000>;
+			size = <0 0x4000>;
+			no-map;
+		};
 	};
 
 	adsp_pas: remoteproc-adsp {
@@ -3282,6 +3288,10 @@
 				memory-region = <&mpss_region>;
 			};
 
+			metadata {
+				memory-region = <&mdata_mem>;
+			};
+
 			glink-edge {
 				interrupts = <GIC_SPI 449 IRQ_TYPE_EDGE_RISING>;
 				label = "modem";
-- 
2.17.1

[PATCH V4 10/11] arm64: dts: qcom: sc7180: Add a carveout for modem metadata

[Sibi Sankar]

Add a new carveout for modem metadata on SC7180 SoCs.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v4:
 * Use size/alloc-ranges instead of a specific address [Bjorn]

v2:
 * Split dt/bindings per SoC [Krzysztof]

 arch/arm64/boot/dts/qcom/sc7180-idp.dts      | 8 +++++++-
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 8 +++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
index c7a22c7976b7..774f9d45f051 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
+++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
@@ -80,6 +80,12 @@
 			reg = <0x0 0x94400000 0x0 0x200000>;
 			no-map;
 		};
+
+		mdata_mem: mpss-metadata {
+			alloc-ranges = <0x0 0xa0000000 0x0 0x20000000>;
+			size = <0x0 0x4000>;
+			no-map;
+		};
 	};
 };
 
@@ -382,7 +388,7 @@
 	clock-names = "iface", "bus", "nav", "snoc_axi", "mnoc_axi", "xo";
 
 	iommus = <&apps_smmu 0x461 0x0>, <&apps_smmu 0x444 0x3>;
-	memory-region = <&mba_mem &mpss_mem>;
+	memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
 
 	resets = <&aoss_reset AOSS_CC_MSS_RESTART>,
 		 <&pdc_reset PDC_MODEM_SYNC_RESET>;
diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
index edb56c4d55a2..0dc65cfeba07 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
@@ -81,6 +81,12 @@
 			reg = <0x0 0x94400000 0x0 0x200000>;
 			no-map;
 		};
+
+		mdata_mem: mpss-metadata {
+			alloc-ranges = <0x0 0xa0000000 0x0 0x20000000>;
+			size = <0x0 0x4000>;
+			no-map;
+		};
 	};
 
 	aliases {
@@ -865,7 +871,7 @@ hp_i2c: &i2c9 {
 	clock-names = "iface", "bus", "nav", "snoc_axi", "mnoc_axi", "xo";
 
 	iommus = <&apps_smmu 0x461 0x0>, <&apps_smmu 0x444 0x3>;
-	memory-region = <&mba_mem &mpss_mem>;
+	memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
 
 	/* This gets overridden for SKUs with LTE support. */
 	firmware-name = "qcom/sc7180-trogdor/modem-nolte/mba.mbn",
-- 
2.17.1

[PATCH V4 11/11] arm64: dts: qcom: sc7280: Add a carveout for modem metadata

[Sibi Sankar]

Add a new carveout for modem metadata on SC7280 SoCs.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
---

v4:
 * Use size/alloc-ranges instead of a specific address [Bjorn]

v2:
 * Split dt/bindings per SoC [Krzysztof]

 arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
index efd513164501..a5f7cbe8a53e 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
@@ -17,6 +17,12 @@
 			reg = <0x0 0x9c700000 0x0 0x200000>;
 			no-map;
 		};
+
+		mdata_mem: mpss-metadata {
+			alloc-ranges = <0x0 0xa0000000 0x0 0x20000000>;
+			size = <0x0 0x4000>;
+			no-map;
+		};
 	};
 };
 
@@ -37,7 +43,7 @@
 
 	iommus = <&apps_smmu 0x124 0x0>, <&apps_smmu 0x488 0x7>;
 	interconnects = <&mc_virt MASTER_LLCC 0 &mc_virt SLAVE_EBI1 0>;
-	memory-region = <&mba_mem>, <&mpss_mem>;
+	memory-region = <&mba_mem>, <&mpss_mem>, <&mdata_mem>;
 	firmware-name = "qcom/sc7280-herobrine/modem/mba.mbn",
 			"qcom/sc7280-herobrine/modem/qdsp6sw.mbn";
 
-- 
2.17.1

Re: [PATCH V4 06/11] remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem headers

[Manivannan Sadhasivam]

On Tue, Jan 17, 2023 at 02:28:35PM +0530, Sibi Sankar wrote:
> Any access to the dynamically allocated metadata region by the application
> processor after assigning it to the remote Q6 will result in a XPU
> violation. Fix this by replacing the dynamically allocated memory region
> with a no-map carveout and unmap the modem metadata memory region before
> passing control to the remote Q6.
> 
> Reported-and-tested-by: Amit Pundir <amit.pundir@linaro.org>
> Fixes: 6c5a9dc2481b ("remoteproc: qcom: Make secure world call for mem ownership switch")
> Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Thanks,
Mani

> ---
> 
> v4:
>  * Use size/alloc-ranges instead of a specific address [Bjorn]
>  * Include size checks
> 
> v3:
>  * Drop revert no_kernel_mapping since it's already on the list [Mani]
>  * kfree metadata from the branch for parity
> 
>  drivers/remoteproc/qcom_q6v5_mss.c | 59 +++++++++++++++++++++++++++---
>  1 file changed, 53 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index e2f765f87ec9..292e22f58df3 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -17,6 +17,7 @@
>  #include <linux/module.h>
>  #include <linux/of_address.h>
>  #include <linux/of_device.h>
> +#include <linux/of_reserved_mem.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_domain.h>
>  #include <linux/pm_runtime.h>
> @@ -215,6 +216,9 @@ struct q6v5 {
>  	size_t mba_size;
>  	size_t dp_size;
>  
> +	phys_addr_t mdata_phys;
> +	size_t mdata_size;
> +
>  	phys_addr_t mpss_phys;
>  	phys_addr_t mpss_reloc;
>  	size_t mpss_size;
> @@ -973,15 +977,35 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw,
>  	if (IS_ERR(metadata))
>  		return PTR_ERR(metadata);
>  
> -	ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
> -	if (!ptr) {
> -		kfree(metadata);
> -		dev_err(qproc->dev, "failed to allocate mdt buffer\n");
> -		return -ENOMEM;
> +	if (qproc->mdata_phys) {
> +		if (size > qproc->mdata_size) {
> +			ret = -EINVAL;
> +			dev_err(qproc->dev, "metadata size outside memory range\n");
> +			goto free_metadata;
> +		}
> +
> +		phys = qproc->mdata_phys;
> +		ptr = memremap(qproc->mdata_phys, size, MEMREMAP_WC);
> +		if (!ptr) {
> +			ret = -EBUSY;
> +			dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n",
> +				&qproc->mdata_phys, size);
> +			goto free_metadata;
> +		}
> +	} else {
> +		ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
> +		if (!ptr) {
> +			ret = -ENOMEM;
> +			dev_err(qproc->dev, "failed to allocate mdt buffer\n");
> +			goto free_metadata;
> +		}
>  	}
>  
>  	memcpy(ptr, metadata, size);
>  
> +	if (qproc->mdata_phys)
> +		memunmap(ptr);
> +
>  	/* Hypervisor mapping to access metadata by modem */
>  	mdata_perm = BIT(QCOM_SCM_VMID_HLOS);
>  	ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm, false, true,
> @@ -1010,7 +1034,9 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw,
>  			 "mdt buffer not reclaimed system may become unstable\n");
>  
>  free_dma_attrs:
> -	dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs);
> +	if (!qproc->mdata_phys)
> +		dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs);
> +free_metadata:
>  	kfree(metadata);
>  
>  	return ret < 0 ? ret : 0;
> @@ -1847,6 +1873,7 @@ static int q6v5_init_reset(struct q6v5 *qproc)
>  static int q6v5_alloc_memory_region(struct q6v5 *qproc)
>  {
>  	struct device_node *child;
> +	struct reserved_mem *rmem;
>  	struct device_node *node;
>  	struct resource r;
>  	int ret;
> @@ -1893,6 +1920,26 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc)
>  	qproc->mpss_phys = qproc->mpss_reloc = r.start;
>  	qproc->mpss_size = resource_size(&r);
>  
> +	if (!child) {
> +		node = of_parse_phandle(qproc->dev->of_node, "memory-region", 2);
> +	} else {
> +		child = of_get_child_by_name(qproc->dev->of_node, "metadata");
> +		node = of_parse_phandle(child, "memory-region", 0);
> +		of_node_put(child);
> +	}
> +
> +	if (!node)
> +		return 0;
> +
> +	rmem = of_reserved_mem_lookup(node);
> +	if (!rmem) {
> +		dev_err(qproc->dev, "unable to resolve metadata region\n");
> +		return -EINVAL;
> +	}
> +
> +	qproc->mdata_phys = rmem->base;
> +	qproc->mdata_size = rmem->size;
> +
>  	return 0;
>  }
>  
> -- 
> 2.17.1
> 

-- 
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Re: (subset) [PATCH V4 00/11] Fix XPU violation during modem metadata authentication

[Bjorn Andersson]

On Tue, 17 Jan 2023 14:28:29 +0530, Sibi Sankar wrote:
> The memory region allocated using dma_alloc_attr with no kernel mapping
> attribute set would still be a part of the linear kernel map. Any access
> to this region by the application processor after assigning it to the
> remote Q6 will result in a XPU violation. Fix this by replacing the
> dynamically allocated memory region with a no-map carveout and unmap the
> modem metadata memory region before passing control to the remote Q6.
> The addition of the carveout and memunmap is required only on SoCs that
> mandate memory protection before transferring control to Q6, hence the
> driver falls back to dynamic memory allocation in the absence of the
> modem metadata carveout.
> 
> [...]

Applied, thanks!

[01/11] dt-bindings: remoteproc: qcom,q6v5: Move MSM8996 to schema
        commit: bdea142295ffd76aaec2a90a36ba09ad19660686
[02/11] dt-bindings: remoteproc: qcom,msm8996-mss-pil: Update memory region
        commit: 9b3024247b2ddea6880fa77b638c870ddbdb6bba
[03/11] dt-bindings: remoteproc: qcom,sc7180-mss-pil: Update memory-region
        commit: 95864f27330674c970c84b81ae791182de150b0f
[04/11] dt-bindings: remoteproc: qcom,sc7280-mss-pil: Update memory-region
        commit: eb48137d783b4c845c7b081e32a73666326dcbb3
[05/11] Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata region before/after use"
        commit: a899d542b687c9b04ccbd9eefabc829ba5fef791
[06/11] remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem headers
        commit: 57f72170a2b2a362c35bb9407fc844eac5afdec1

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>

Re: [PATCH V4 00/11] Fix XPU violation during modem metadata authentication

[Will Deacon]

Hi Sibi,

On Tue, Jan 17, 2023 at 02:28:29PM +0530, Sibi Sankar wrote:
> The memory region allocated using dma_alloc_attr with no kernel mapping
> attribute set would still be a part of the linear kernel map. Any access
> to this region by the application processor after assigning it to the
> remote Q6 will result in a XPU violation. Fix this by replacing the
> dynamically allocated memory region with a no-map carveout and unmap the
> modem metadata memory region before passing control to the remote Q6.
> The addition of the carveout and memunmap is required only on SoCs that
> mandate memory protection before transferring control to Q6, hence the
> driver falls back to dynamic memory allocation in the absence of the
> modem metadata carveout.

[...]

>   remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem
>     headers

With this change now merged, am I ok to downgrade the arm64
arch_dma_prep_coherent() back to a clean?

Thanks,

Will

Re: [PATCH V4 00/11] Fix XPU violation during modem metadata authentication

[Manivannan Sadhasivam]

On Mon, Mar 27, 2023 at 05:18:57PM +0100, Will Deacon wrote:
> Hi Sibi,
> 
> On Tue, Jan 17, 2023 at 02:28:29PM +0530, Sibi Sankar wrote:
> > The memory region allocated using dma_alloc_attr with no kernel mapping
> > attribute set would still be a part of the linear kernel map. Any access
> > to this region by the application processor after assigning it to the
> > remote Q6 will result in a XPU violation. Fix this by replacing the
> > dynamically allocated memory region with a no-map carveout and unmap the
> > modem metadata memory region before passing control to the remote Q6.
> > The addition of the carveout and memunmap is required only on SoCs that
> > mandate memory protection before transferring control to Q6, hence the
> > driver falls back to dynamic memory allocation in the absence of the
> > modem metadata carveout.
> 
> [...]
> 
> >   remoteproc: qcom_q6v5_mss: Use a carveout to authenticate modem
> >     headers
> 
> With this change now merged, am I ok to downgrade the arm64
> arch_dma_prep_coherent() back to a clean?
> 

I think you can. If something breaks, we will fix it (without reverting) ;)

- Mani

> Thanks,
> 
> Will

-- 
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