/* * digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family * * Copyright (c) 2014-2015 Takashi Sakamoto * * Licensed under the terms of the GNU General Public License, version 2. */ #include #include "digi00x.h" static int fill_midi_message(struct snd_rawmidi_substream *substream, u8 *buf) { int bytes; buf[0] = 0x80; bytes = snd_rawmidi_transmit_peek(substream, buf + 1, 2); if (bytes >= 0) buf[3] = 0xc0 | bytes; return bytes; } static void handle_midi_control(struct snd_dg00x *dg00x, __be32 *buf, unsigned int length) { struct snd_rawmidi_substream *substream; unsigned int i; unsigned int len; u8 *b; substream = ACCESS_ONCE(dg00x->in_control); if (substream == NULL) return; length /= 4; for (i = 0; i < length; i++) { b = (u8 *)&buf[i]; len = b[3] & 0xf; if (len > 0) snd_rawmidi_receive(dg00x->in_control, b + 1, len); } } static void handle_unknown_message(struct snd_dg00x *dg00x, unsigned long long offset, __be32 *buf) { unsigned long flags; spin_lock_irqsave(&dg00x->lock, flags); dg00x->msg = be32_to_cpu(*buf); spin_unlock_irqrestore(&dg00x->lock, flags); wake_up(&dg00x->hwdep_wait); } static void handle_message(struct fw_card *card, struct fw_request *request, int tcode, int destination, int source, int generation, unsigned long long offset, void *data, size_t length, void *callback_data) { struct snd_dg00x *dg00x = callback_data; __be32 *buf = (__be32 *)data; if (offset == dg00x->async_handler.offset) handle_unknown_message(dg00x, offset, buf); else if (offset == dg00x->async_handler.offset + 4) handle_midi_control(dg00x, buf, length); fw_send_response(card, request, RCODE_COMPLETE); } int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x) { struct fw_device *device = fw_parent_device(dg00x->unit); __be32 data[2]; int err; /* Unknown. 4bytes. */ data[0] = cpu_to_be32((device->card->node_id << 16) | (dg00x->async_handler.offset >> 32)); data[1] = cpu_to_be32(dg00x->async_handler.offset); err = snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST, DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR, &data, sizeof(data), 0); if (err < 0) return err; /* Asynchronous transactions for MIDI control message. */ data[0] = cpu_to_be32((device->card->node_id << 16) | (dg00x->async_handler.offset >> 32)); data[1] = cpu_to_be32(dg00x->async_handler.offset + 4); return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST, DG00X_ADDR_BASE + DG00X_OFFSET_MIDI_CTL_ADDR, &data, sizeof(data), 0); } int snd_dg00x_transaction_register(struct snd_dg00x *dg00x) { static const struct fw_address_region resp_register_region = { .start = 0xffffe0000000ull, .end = 0xffffe000ffffull, }; int err; dg00x->async_handler.length = 12; dg00x->async_handler.address_callback = handle_message; dg00x->async_handler.callback_data = dg00x; err = fw_core_add_address_handler(&dg00x->async_handler, &resp_register_region); if (err < 0) return err; err = snd_dg00x_transaction_reregister(dg00x); if (err < 0) goto error; err = snd_fw_async_midi_port_init(&dg00x->out_control, dg00x->unit, DG00X_ADDR_BASE + DG00X_OFFSET_MMC, 4, fill_midi_message); if (err < 0) goto error; return err; error: fw_core_remove_address_handler(&dg00x->async_handler); dg00x->async_handler.callback_data = NULL; return err; } void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x) { if (dg00x->async_handler.callback_data == NULL) return; snd_fw_async_midi_port_destroy(&dg00x->out_control); fw_core_remove_address_handler(&dg00x->async_handler); dg00x->async_handler.callback_data = NULL; } ue='25'>25space:mode:
authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /include/scsi/sg.h
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/scsi/sg.h')