/* Copyright (C) 2005-2006 by Texas Instruments */ #ifndef _CPPI_DMA_H_ #define _CPPI_DMA_H_ #include #include #include #include #include #include "musb_core.h" #include "musb_dma.h" /* CPPI RX/TX state RAM */ struct cppi_tx_stateram { u32 tx_head; /* "DMA packet" head descriptor */ u32 tx_buf; u32 tx_current; /* current descriptor */ u32 tx_buf_current; u32 tx_info; /* flags, remaining buflen */ u32 tx_rem_len; u32 tx_dummy; /* unused */ u32 tx_complete; }; struct cppi_rx_stateram { u32 rx_skipbytes; u32 rx_head; u32 rx_sop; /* "DMA packet" head descriptor */ u32 rx_current; /* current descriptor */ u32 rx_buf_current; u32 rx_len_len; u32 rx_cnt_cnt; u32 rx_complete; }; /* hw_options bits in CPPI buffer descriptors */ #define CPPI_SOP_SET ((u32)(1 << 31)) #define CPPI_EOP_SET ((u32)(1 << 30)) #define CPPI_OWN_SET ((u32)(1 << 29)) /* owned by cppi */ #define CPPI_EOQ_MASK ((u32)(1 << 28)) #define CPPI_ZERO_SET ((u32)(1 << 23)) /* rx saw zlp; tx issues one */ #define CPPI_RXABT_MASK ((u32)(1 << 19)) /* need more rx buffers */ #define CPPI_RECV_PKTLEN_MASK 0xFFFF #define CPPI_BUFFER_LEN_MASK 0xFFFF #define CPPI_TEAR_READY ((u32)(1 << 31)) /* CPPI data structure definitions */ #define CPPI_DESCRIPTOR_ALIGN 16 /* bytes; 5-dec docs say 4-byte align */ struct cppi_descriptor { /* hardware overlay */ u32 hw_next; /* next buffer descriptor Pointer */ u32 hw_bufp; /* i/o buffer pointer */ u32 hw_off_len; /* buffer_offset16, buffer_length16 */ u32 hw_options; /* flags: SOP, EOP etc*/ struct cppi_descriptor *next; dma_addr_t dma; /* address of this descriptor */ u32 buflen; /* for RX: original buffer length */ } __attribute__ ((aligned(CPPI_DESCRIPTOR_ALIGN))); struct cppi; /* CPPI Channel Control structure */ struct cppi_channel { struct dma_channel channel; /* back pointer to the DMA controller structure */ struct cppi *controller; /* which direction of which endpoint? */ struct musb_hw_ep *hw_ep; bool transmit; u8 index; /* DMA modes: RNDIS or "transparent" */ u8 is_rndis; /* book keeping for current transfer request */ dma_addr_t buf_dma; u32 buf_len; u32 maxpacket; u32 offset; /* dma requested */ void __iomem *state_ram; /* CPPI state */ struct cppi_descriptor *freelist; /* BD management fields */ struct cppi_descriptor *head; struct cppi_descriptor *tail; struct cppi_descriptor *last_processed; /* use tx_complete in host role to track endpoints waiting for * FIFONOTEMPTY to clear. */ struct list_head tx_complete; }; /* CPPI DMA controller object */ struct cppi { struct dma_controller controller; struct musb *musb; void __iomem *mregs; /* Mentor regs */ void __iomem *tibase; /* TI/CPPI regs */ int irq; struct cppi_channel tx[4]; struct cppi_channel rx[4]; struct dma_pool *pool; struct list_head tx_complete; }; /* CPPI IRQ handler */ extern irqreturn_t cppi_interrupt(int, void *); struct cppi41_dma_channel { struct dma_channel channel; struct cppi41_dma_controller *controller; struct musb_hw_ep *hw_ep; struct dma_chan *dc; dma_cookie_t cookie; u8 port_num; u8 is_tx; u8 is_allocated; u8 usb_toggle; dma_addr_t buf_addr; u32 total_len; u32 prog_len; u32 transferred; u32 packet_sz; struct list_head tx_check; int tx_zlp; }; #endif /* end of ifndef _CPPI_DMA_H_ */ ed='selected'>3space: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 /net/kcm/Makefile
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 'net/kcm/Makefile')