Merge tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrlgrafted

Pull pin control updates from Linus Walleij:
 "Core changes:

   - Use the non-blocking mux_state_try_select() in the generic MUX pin
     control back-end

   - Free pin maps on pinctrl_generic_to_map() failure in the core
     helpers

  New hardware pin control:

   - Qualcomm Maili TLMM SoC, PMG1110 PMIC, and Eliza LPASS LPI TLMM SoC
     (this is for the low power audio, LPASS = Low Power Audio SubSystem
     portions)

   - Upboard support on top of the Intel pin controller

   - Apple T6030 and T6031 support (just compatible strings)

   - Samsung Exynos 8855 SoC

   - Mediatek MT6858 SoC

   - Rockchip RK3308B and RV1106 SoCs

   - Airoha EN7523 and AN7563 SoCs

  Improvements:

   - Qualcomm TLMM GPIOs are unconditionally marked as wakeup capable

   - Qualcomm improvements on top of the Qualcomm PDC (power domain
     controller) irqchip improvements from tglx:s tree

   - Qualcomm IPQ806x and IPQ9650 non-urgent pin grop fixups

   - The NPCM8xx driver has been put into shape fixing many pin and
     group definitions

   - Some non-urgent Tegra 264 pin assignments are fixed up

   - Some non-urgent fixups to Airoha AN7581 and AN7583 registers and
     pin assignments, missing features etc"

* tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (130 commits)
  dt-bindings: pinctrl: Convert TI DA850 pupd to DT schema
  pinctrl: meson: sync some modify from A4
  pinctrl: meson: a4: Add input enable pin configuration
  pinctrl: realtek: rtd1625: remove unused group name spdif_sel
  pinctrl: realtek: rtd1625: fix base_bit for VE4 GPIO 13
  dt-bindings: pinctrl: microchip,pic32mzda-pinctrl: Convert to DT schema
  Revert "Merge branch 'ib-rsk7204' into devel"
  pinctrl: rockchip: Add RV1106 pinctrl support
  dt-bindings: pinctrl: rockchip: Add RV1106 compatible
  pinctrl: rockchip: Decode drive strength in the get function
  pinctrl: fix PINCTRL_GENERIC_MUX not always being selectable
  pinctrl: airoha: add support of an7563 SoC
  dt-bindings: pinctrl: airoha: add support of an7563 pin controller
  pinctrl: airoha: try to find chip scu node by phandle first
  pinctrl: airoha: add support of en7523 SoC
  dt-bindings: pinctrl: airoha: add support of en7523 pin controller
  pinctrl: airoha: an7583: add support for olt pinmux
  pinctrl: airoha: an7583: add support for pon_alt pinmux
  pinctrl: airoha: an7583: add support for npu_uart pinmux
  dt-bindings: pinctrl: airoha: an7583: add missed features
  ...

1 files changed, 263 insertions, 0 deletions

diff --git a/Documentation/bpf/map_array.rst b/Documentation/bpf/map_array.rst
new file mode 100644
index 000000000..fa56ff751
--- /dev/null
+++ b/Documentation/bpf/map_array.rst
@@ -0,0 +1,263 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+.. Copyright (C) 2022 Red Hat, Inc.
+
+================================================
+BPF_MAP_TYPE_ARRAY and BPF_MAP_TYPE_PERCPU_ARRAY
+================================================
+
+.. note::
+   - ``BPF_MAP_TYPE_ARRAY`` was introduced in kernel version 3.19
+   - ``BPF_MAP_TYPE_PERCPU_ARRAY`` was introduced in version 4.6
+
+``BPF_MAP_TYPE_ARRAY`` and ``BPF_MAP_TYPE_PERCPU_ARRAY`` provide generic array
+storage. The key type is an unsigned 32-bit integer (4 bytes) and the map is
+of constant size. The size of the array is defined in ``max_entries`` at
+creation time. All array elements are pre-allocated and zero initialized when
+created. ``BPF_MAP_TYPE_PERCPU_ARRAY`` uses a different memory region for each
+CPU whereas ``BPF_MAP_TYPE_ARRAY`` uses the same memory region. The value
+stored can be of any size for ``BPF_MAP_TYPE_ARRAY`` and not more than
+``PCPU_MIN_UNIT_SIZE`` (32 kB) for ``BPF_MAP_TYPE_PERCPU_ARRAY``. All
+array elements are aligned to 8 bytes.
+
+Since kernel 5.5, memory mapping may be enabled for ``BPF_MAP_TYPE_ARRAY`` by
+setting the flag ``BPF_F_MMAPABLE``. The map definition is page-aligned and
+starts on the first page. Sufficient page-sized and page-aligned blocks of
+memory are allocated to store all array values, starting on the second page,
+which in some cases will result in over-allocation of memory. The benefit of
+using this is increased performance and ease of use since userspace programs
+would not be required to use helper functions to access and mutate data.
+
+Usage
+=====
+
+Kernel BPF
+----------
+
+bpf_map_lookup_elem()
+~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: c
+
+   void *bpf_map_lookup_elem(struct bpf_map *map, const void *key)
+
+Array elements can be retrieved using the ``bpf_map_lookup_elem()`` helper.
+This helper returns a pointer into the array element, so to avoid data races
+with userspace reading the value, the user must use primitives like
+``__sync_fetch_and_add()`` when updating the value in-place.
+
+bpf_map_update_elem()
+~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: c
+
+   long bpf_map_update_elem(struct bpf_map *map, const void *key, const void *value, u64 flags)
+
+Array elements can be updated using the ``bpf_map_update_elem()`` helper.
+
+``bpf_map_update_elem()`` returns 0 on success, or negative error in case of
+failure.
+
+Since the array is of constant size, ``bpf_map_delete_elem()`` is not supported.
+To clear an array element, you may use ``bpf_map_update_elem()`` to insert a
+zero value to that index.
+
+Per CPU Array
+-------------
+
+Values stored in ``BPF_MAP_TYPE_ARRAY`` can be accessed by multiple programs
+across different CPUs. To restrict storage to a single CPU, you may use a
+``BPF_MAP_TYPE_PERCPU_ARRAY``.
+
+When using a ``BPF_MAP_TYPE_PERCPU_ARRAY`` the ``bpf_map_update_elem()`` and
+``bpf_map_lookup_elem()`` helpers automatically access the slot for the current
+CPU.
+
+bpf_map_lookup_percpu_elem()
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. code-block:: c
+
+   void *bpf_map_lookup_percpu_elem(struct bpf_map *map, const void *key, u32 cpu)
+
+The ``bpf_map_lookup_percpu_elem()`` helper can be used to lookup the array
+value for a specific CPU. Returns value on success , or ``NULL`` if no entry was
+found or ``cpu`` is invalid.
+
+Concurrency
+-----------
+
+Since kernel version 5.1, the BPF infrastructure provides ``struct bpf_spin_lock``
+to synchronize access.
+
+Userspace
+---------
+
+Access from userspace uses libbpf APIs with the same names as above, with
+the map identified by its ``fd``.
+
+Examples
+========
+
+Please see the ``tools/testing/selftests/bpf`` directory for functional
+examples. The code samples below demonstrate API usage.
+
+Kernel BPF
+----------
+
+This snippet shows how to declare an array in a BPF program.
+
+.. code-block:: c
+
+    struct {
+            __uint(type, BPF_MAP_TYPE_ARRAY);
+            __type(key, u32);
+            __type(value, long);
+            __uint(max_entries, 256);
+    } my_map SEC(".maps");
+
+
+This example BPF program shows how to access an array element.
+
+.. code-block:: c
+
+    int bpf_prog(struct __sk_buff *skb)
+    {
+            struct iphdr ip;
+            int index;
+            long *value;
+
+            if (bpf_skb_load_bytes(skb, ETH_HLEN, &ip, sizeof(ip)) < 0)
+                    return 0;
+
+            index = ip.protocol;
+            value = bpf_map_lookup_elem(&my_map, &index);
+            if (value)
+                    __sync_fetch_and_add(value, skb->len);
+
+            return 0;
+    }
+
+Userspace
+---------
+
+BPF_MAP_TYPE_ARRAY
+~~~~~~~~~~~~~~~~~~
+
+This snippet shows how to create an array, using ``bpf_map_create_opts`` to
+set flags.
+
+.. code-block:: c
+
+    #include <bpf/libbpf.h>
+    #include <bpf/bpf.h>
+
+    int create_array()
+    {
+            int fd;
+            LIBBPF_OPTS(bpf_map_create_opts, opts, .map_flags = BPF_F_MMAPABLE);
+
+            fd = bpf_map_create(BPF_MAP_TYPE_ARRAY,
+                                "example_array",       /* name */
+                                sizeof(__u32),         /* key size */
+                                sizeof(long),          /* value size */
+                                256,                   /* max entries */
+                                &opts);                /* create opts */
+            return fd;
+    }
+
+This snippet shows how to initialize the elements of an array.
+
+.. code-block:: c
+
+    int initialize_array(int fd)
+    {
+            __u32 i;
+            long value;
+            int ret;
+
+            for (i = 0; i < 256; i++) {
+                    value = i;
+                    ret = bpf_map_update_elem(fd, &i, &value, BPF_ANY);
+                    if (ret < 0)
+                            return ret;
+            }
+
+            return ret;
+    }
+
+This snippet shows how to retrieve an element value from an array.
+
+.. code-block:: c
+
+    int lookup(int fd)
+    {
+            __u32 index = 42;
+            long value;
+            int ret;
+
+            ret = bpf_map_lookup_elem(fd, &index, &value);
+            if (ret < 0)
+                    return ret;
+
+            /* use value here */
+            assert(value == 42);
+
+            return ret;
+    }
+
+BPF_MAP_TYPE_PERCPU_ARRAY
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This snippet shows how to initialize the elements of a per CPU array.
+
+.. code-block:: c
+
+    int initialize_array(int fd)
+    {
+            int ncpus = libbpf_num_possible_cpus();
+            long values[ncpus];
+            __u32 i, j;
+            int ret;
+
+            for (i = 0; i < 256 ; i++) {
+                    for (j = 0; j < ncpus; j++)
+                            values[j] = i;
+                    ret = bpf_map_update_elem(fd, &i, &values, BPF_ANY);
+                    if (ret < 0)
+                            return ret;
+            }
+
+            return ret;
+    }
+
+This snippet shows how to access the per CPU elements of an array value.
+
+.. code-block:: c
+
+    int lookup(int fd)
+    {
+            int ncpus = libbpf_num_possible_cpus();
+            __u32 index = 42, j;
+            long values[ncpus];
+            int ret;
+
+            ret = bpf_map_lookup_elem(fd, &index, &values);
+            if (ret < 0)
+                    return ret;
+
+            for (j = 0; j < ncpus; j++) {
+                    /* Use per CPU value here */
+                    assert(values[j] == 42);
+            }
+
+            return ret;
+    }
+
+Semantics
+=========
+
+As shown in the example above, when accessing a ``BPF_MAP_TYPE_PERCPU_ARRAY``
+in userspace, each value is an array with ``ncpus`` elements.
+
+When calling ``bpf_map_update_elem()`` the flag ``BPF_NOEXIST`` can not be used
+for these maps.