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path: root/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c
new file mode 100644
index 000000000..f9c427559
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowacpi.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+#include "priv.h"
+
+static int
+acpi_read_bios(acpi_handle rom_handle, u8 *bios, u32 offset, u32 length)
+{
+#if defined(CONFIG_ACPI) && defined(CONFIG_X86)
+ acpi_status status;
+ union acpi_object rom_arg_elements[2], *obj;
+ struct acpi_object_list rom_arg;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
+
+ rom_arg.count = 2;
+ rom_arg.pointer = &rom_arg_elements[0];
+
+ rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
+ rom_arg_elements[0].integer.value = offset;
+
+ rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
+ rom_arg_elements[1].integer.value = length;
+
+ status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
+ if (ACPI_FAILURE(status)) {
+ pr_info("failed to evaluate ROM got %s\n",
+ acpi_format_exception(status));
+ return -ENODEV;
+ }
+ obj = (union acpi_object *)buffer.pointer;
+ length = min(length, obj->buffer.length);
+ memcpy(bios+offset, obj->buffer.pointer, length);
+ kfree(buffer.pointer);
+ return length;
+#else
+ return -EINVAL;
+#endif
+}
+
+/* This version of the shadow function disobeys the ACPI spec and tries
+ * to fetch in units of more than 4KiB at a time. This is a LOT faster
+ * on some systems, such as Lenovo W530.
+ */
+static u32
+acpi_read_fast(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
+{
+ u32 limit = (offset + length + 0xfff) & ~0xfff;
+ u32 start = offset & ~0x00000fff;
+ u32 fetch = limit - start;
+
+ if (nvbios_extend(bios, limit) >= 0) {
+ int ret = acpi_read_bios(data, bios->data, start, fetch);
+ if (ret == fetch)
+ return fetch;
+ }
+
+ return 0;
+}
+
+/* Other systems, such as the one in fdo#55948, will report a success
+ * but only return 4KiB of data. The common bios fetching logic will
+ * detect an invalid image, and fall back to this version of the read
+ * function.
+ */
+static u32
+acpi_read_slow(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
+{
+ u32 limit = (offset + length + 0xfff) & ~0xfff;
+ u32 start = offset & ~0xfff;
+ u32 fetch = 0;
+
+ if (nvbios_extend(bios, limit) >= 0) {
+ while (start + fetch < limit) {
+ int ret = acpi_read_bios(data, bios->data,
+ start + fetch, 0x1000);
+ if (ret != 0x1000)
+ break;
+ fetch += 0x1000;
+ }
+ }
+
+ return fetch;
+}
+
+static void *
+acpi_init(struct nvkm_bios *bios, const char *name)
+{
+#if defined(CONFIG_ACPI) && defined(CONFIG_X86)
+ acpi_status status;
+ acpi_handle dhandle, rom_handle;
+
+ dhandle = ACPI_HANDLE(bios->subdev.device->dev);
+ if (!dhandle)
+ return ERR_PTR(-ENODEV);
+
+ status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
+ if (ACPI_FAILURE(status))
+ return ERR_PTR(-ENODEV);
+
+ return rom_handle;
+#else
+ return ERR_PTR(-ENODEV);
+#endif
+}
+
+const struct nvbios_source
+nvbios_acpi_fast = {
+ .name = "ACPI",
+ .init = acpi_init,
+ .read = acpi_read_fast,
+ .rw = false,
+ .require_checksum = true,
+};
+
+const struct nvbios_source
+nvbios_acpi_slow = {
+ .name = "ACPI",
+ .init = acpi_init,
+ .read = acpi_read_slow,
+ .rw = false,
+};