[PATCH v7 1/3] Documentation: arm: Add bootargs to the table of added DT parameters

[PATCH v7 1/3] Documentation: arm: Add bootargs to the table of added DT parameters

[Alexandre Ghiti]

The bootargs node is also added by the EFI stub in the function
update_fdt(), so add it to the table.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Song Shuai <songshuaishuai@tinylab.org>
---
- Changes in v5:
  * Rebase on top of docs-next

 Documentation/arch/arm/uefi.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/arch/arm/uefi.rst b/Documentation/arch/arm/uefi.rst
index baebe688a006..2b7ad9bd7cd2 100644
--- a/Documentation/arch/arm/uefi.rst
+++ b/Documentation/arch/arm/uefi.rst
@@ -50,7 +50,7 @@ The stub populates the FDT /chosen node with (and the kernel scans for) the
 following parameters:
 
 ==========================  ======   ===========================================
-Name                        Size     Description
+Name                        Type     Description
 ==========================  ======   ===========================================
 linux,uefi-system-table     64-bit   Physical address of the UEFI System Table.
 
@@ -67,4 +67,6 @@ linux,uefi-mmap-desc-ver    32-bit   Version of the mmap descriptor format.
 
 kaslr-seed                  64-bit   Entropy used to randomize the kernel image
                                      base address location.
+
+bootargs                    String   Kernel command line
 ==========================  ======   ===========================================
-- 
2.39.2


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[PATCH v7 2/3] Documentation: riscv: Add early boot document

[Alexandre Ghiti]

This document describes the constraints and requirements of the early
boot process in a RISC-V kernel.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Song Shuai <songshuaishuai@tinylab.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
---
Changes in v7:
  * Fix path to arm documentation

Changes in v6:
  * s/cpu/CPU as suggested by Randy
  * s/but/and as suggested by Randy
  * s/entrance/entry as suggested by Randy

Changes in v5:
  * Rebase on top of docs-next

 Documentation/riscv/boot-image-header.rst |   3 -
 Documentation/riscv/boot.rst              | 169 ++++++++++++++++++++++
 Documentation/riscv/index.rst             |   1 +
 3 files changed, 170 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/riscv/boot.rst

diff --git a/Documentation/riscv/boot-image-header.rst b/Documentation/riscv/boot-image-header.rst
index d7752533865f..a4a45310c4c4 100644
--- a/Documentation/riscv/boot-image-header.rst
+++ b/Documentation/riscv/boot-image-header.rst
@@ -7,9 +7,6 @@ Boot image header in RISC-V Linux
 
 This document only describes the boot image header details for RISC-V Linux.
 
-TODO:
-  Write a complete booting guide.
-
 The following 64-byte header is present in decompressed Linux kernel image::
 
 	u32 code0;		  /* Executable code */
diff --git a/Documentation/riscv/boot.rst b/Documentation/riscv/boot.rst
new file mode 100644
index 000000000000..6077b587a842
--- /dev/null
+++ b/Documentation/riscv/boot.rst
@@ -0,0 +1,169 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============================================
+RISC-V Kernel Boot Requirements and Constraints
+===============================================
+
+:Author: Alexandre Ghiti <alexghiti@rivosinc.com>
+:Date: 23 May 2023
+
+This document describes what the RISC-V kernel expects from bootloaders and
+firmware, and also the constraints that any developer must have in mind when
+touching the early boot process. For the purposes of this document, the
+``early boot process`` refers to any code that runs before the final virtual
+mapping is set up.
+
+Pre-kernel Requirements and Constraints
+=======================================
+
+The RISC-V kernel expects the following of bootloaders and platform firmware:
+
+Register state
+--------------
+
+The RISC-V kernel expects:
+
+  * ``$a0`` to contain the hartid of the current core.
+  * ``$a1`` to contain the address of the devicetree in memory.
+
+CSR state
+---------
+
+The RISC-V kernel expects:
+
+  * ``$satp = 0``: the MMU, if present, must be disabled.
+
+Reserved memory for resident firmware
+-------------------------------------
+
+The RISC-V kernel must not map any resident memory, or memory protected with
+PMPs, in the direct mapping, so the firmware must correctly mark those regions
+as per the devicetree specification and/or the UEFI specification.
+
+Kernel location
+---------------
+
+The RISC-V kernel expects to be placed at a PMD boundary (2MB aligned for rv64
+and 4MB aligned for rv32). Note that the EFI stub will physically relocate the
+kernel if that's not the case.
+
+Hardware description
+--------------------
+
+The firmware can pass either a devicetree or ACPI tables to the RISC-V kernel.
+
+The devicetree is either passed directly to the kernel from the previous stage
+using the ``$a1`` register, or when booting with UEFI, it can be passed using the
+EFI configuration table.
+
+The ACPI tables are passed to the kernel using the EFI configuration table. In
+this case, a tiny devicetree is still created by the EFI stub. Please refer to
+"EFI stub and devicetree" section below for details about this devicetree.
+
+Kernel entry
+------------
+
+On SMP systems, there are 2 methods to enter the kernel:
+
+- ``RISCV_BOOT_SPINWAIT``: the firmware releases all harts in the kernel, one hart
+  wins a lottery and executes the early boot code while the other harts are
+  parked waiting for the initialization to finish. This method is mostly used to
+  support older firmwares without SBI HSM extension and M-mode RISC-V kernel.
+- ``Ordered booting``: the firmware releases only one hart that will execute the
+  initialization phase and then will start all other harts using the SBI HSM
+  extension. The ordered booting method is the preferred booting method for
+  booting the RISC-V kernel because it can support CPU hotplug and kexec.
+
+UEFI
+----
+
+UEFI memory map
+~~~~~~~~~~~~~~~
+
+When booting with UEFI, the RISC-V kernel will use only the EFI memory map to
+populate the system memory.
+
+The UEFI firmware must parse the subnodes of the ``/reserved-memory`` devicetree
+node and abide by the devicetree specification to convert the attributes of
+those subnodes (``no-map`` and ``reusable``) into their correct EFI equivalent
+(refer to section "3.5.4 /reserved-memory and UEFI" of the devicetree
+specification v0.4-rc1).
+
+RISCV_EFI_BOOT_PROTOCOL
+~~~~~~~~~~~~~~~~~~~~~~~
+
+When booting with UEFI, the EFI stub requires the boot hartid in order to pass
+it to the RISC-V kernel in ``$a1``. The EFI stub retrieves the boot hartid using
+one of the following methods:
+
+- ``RISCV_EFI_BOOT_PROTOCOL`` (**preferred**).
+- ``boot-hartid`` devicetree subnode (**deprecated**).
+
+Any new firmware must implement ``RISCV_EFI_BOOT_PROTOCOL`` as the devicetree
+based approach is deprecated now.
+
+Early Boot Requirements and Constraints
+=======================================
+
+The RISC-V kernel's early boot process operates under the following constraints:
+
+EFI stub and devicetree
+-----------------------
+
+When booting with UEFI, the devicetree is supplemented (or created) by the EFI
+stub with the same parameters as arm64 which are described at the paragraph
+"UEFI kernel support on ARM" in Documentation/arch/arm/uefi.rst.
+
+Virtual mapping installation
+----------------------------
+
+The installation of the virtual mapping is done in 2 steps in the RISC-V kernel:
+
+1. ``setup_vm()`` installs a temporary kernel mapping in ``early_pg_dir`` which
+   allows discovery of the system memory. Only the kernel text/data are mapped
+   at this point. When establishing this mapping, no allocation can be done
+   (since the system memory is not known yet), so ``early_pg_dir`` page table is
+   statically allocated (using only one table for each level).
+
+2. ``setup_vm_final()`` creates the final kernel mapping in ``swapper_pg_dir``
+   and takes advantage of the discovered system memory to create the linear
+   mapping. When establishing this mapping, the kernel can allocate memory but
+   cannot access it directly (since the direct mapping is not present yet), so
+   it uses temporary mappings in the fixmap region to be able to access the
+   newly allocated page table levels.
+
+For ``virt_to_phys()`` and ``phys_to_virt()`` to be able to correctly convert
+direct mapping addresses to physical addresses, they need to know the start of
+the DRAM. This happens after step 1, right before step 2 installs the direct
+mapping (see ``setup_bootmem()`` function in arch/riscv/mm/init.c). Any usage of
+those macros before the final virtual mapping is installed must be carefully
+examined.
+
+Devicetree mapping via fixmap
+-----------------------------
+
+As the ``reserved_mem`` array is initialized with virtual addresses established
+by ``setup_vm()``, and used with the mapping established by
+``setup_vm_final()``, the RISC-V kernel uses the fixmap region to map the
+devicetree. This ensures that the devicetree remains accessible by both virtual
+mappings.
+
+Pre-MMU execution
+-----------------
+
+A few pieces of code need to run before even the first virtual mapping is
+established. These are the installation of the first virtual mapping itself,
+patching of early alternatives and the early parsing of the kernel command line.
+That code must be very carefully compiled as:
+
+- ``-fno-pie``: This is needed for relocatable kernels which use ``-fPIE``,
+  since otherwise, any access to a global symbol would go through the GOT which
+  is only relocated virtually.
+- ``-mcmodel=medany``: Any access to a global symbol must be PC-relative to
+  avoid any relocations to happen before the MMU is setup.
+- *all* instrumentation must also be disabled (that includes KASAN, ftrace and
+  others).
+
+As using a symbol from a different compilation unit requires this unit to be
+compiled with those flags, we advise, as much as possible, not to use external
+symbols.
diff --git a/Documentation/riscv/index.rst b/Documentation/riscv/index.rst
index 81cf6e616476..4dab0cb4b900 100644
--- a/Documentation/riscv/index.rst
+++ b/Documentation/riscv/index.rst
@@ -6,6 +6,7 @@ RISC-V architecture
     :maxdepth: 1
 
     acpi
+    boot
     boot-image-header
     vm-layout
     hwprobe
-- 
2.39.2


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[PATCH v7 3/3] Documentation: riscv: Update boot image header since EFI stub is supported

[Alexandre Ghiti]

The EFI stub is supported on RISC-V so update the documentation that
explains how the boot image header was reused to support it.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
---
- Changes in v5:
  * Rebase on top of docs-next

 Documentation/riscv/boot-image-header.rst | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/Documentation/riscv/boot-image-header.rst b/Documentation/riscv/boot-image-header.rst
index a4a45310c4c4..df2ffc173e80 100644
--- a/Documentation/riscv/boot-image-header.rst
+++ b/Documentation/riscv/boot-image-header.rst
@@ -28,11 +28,11 @@ header in future.
 Notes
 =====
 
-- This header can also be reused to support EFI stub for RISC-V in future. EFI
-  specification needs PE/COFF image header in the beginning of the kernel image
-  in order to load it as an EFI application. In order to support EFI stub,
-  code0 should be replaced with "MZ" magic string and res3(at offset 0x3c) should
-  point to the rest of the PE/COFF header.
+- This header is also reused to support EFI stub for RISC-V. EFI specification
+  needs PE/COFF image header in the beginning of the kernel image in order to
+  load it as an EFI application. In order to support EFI stub, code0 is replaced
+  with "MZ" magic string and res3(at offset 0x3c) points to the rest of the
+  PE/COFF header.
 
 - version field indicate header version number
 
-- 
2.39.2


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Re: [PATCH v7 1/3] Documentation: arm: Add bootargs to the table of added DT parameters

[patchwork-bot+linux-riscv]

Hello:

This series was applied to riscv/linux.git (fixes)
by Jonathan Corbet <corbet@lwn.net>:

On Thu, 17 Aug 2023 15:07:32 +0200 you wrote:
> The bootargs node is also added by the EFI stub in the function
> update_fdt(), so add it to the table.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> Reviewed-by: Atish Patra <atishp@rivosinc.com>
> Reviewed-by: Song Shuai <songshuaishuai@tinylab.org>
> 
> [...]

Here is the summary with links:
  - [v7,1/3] Documentation: arm: Add bootargs to the table of added DT parameters
    https://git.kernel.org/riscv/c/b4ba5e5eafad
  - [v7,2/3] Documentation: riscv: Add early boot document
    https://git.kernel.org/riscv/c/e79be4bea58f
  - [v7,3/3] Documentation: riscv: Update boot image header since EFI stub is supported
    https://git.kernel.org/riscv/c/180bb41d61b7

You are awesome, thank you!
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