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| author | Zeng Chi <zengchi@kylinos.cn> | 2026-09-21 18:24:42 +0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-09-22 08:36:16 -0700 |
| commit | 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d (patch) | |
| tree | 660d50d4139cb750fbde1ae3432452c20726c99d /drivers/scsi/a3000.h | |
| download | linux-stable-119e9db233ad0f4cbd4cfb9f9385a7bca378b37d.tar.gz linux-stable-119e9db233ad0f4cbd4cfb9f9385a7bca378b37d.zip | |
KVM: Don't pre-reserve xarray entries when storing empty/NULL attributesgrafted
Skip the xarray reservation loop when clearing all memory attributes, as
storing NULL only erases the entry and never needs to allocate, so no
reservation (and no cleanup of a failed one) is required in that case.
Suggested-by: Sean Christopherson <seanjc@google.com>
Cc: David Ballesteros <davimaba.v@proton.me>
Signed-off-by: Zeng Chi <zengchi@kylinos.cn>
Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com
[sean: split to separate patch]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'drivers/scsi/a3000.h')
| -rw-r--r-- | drivers/scsi/a3000.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/scsi/a3000.h b/drivers/scsi/a3000.h new file mode 100644 index 000000000..5cb3e7535 --- /dev/null +++ b/drivers/scsi/a3000.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef A3000_H +#define A3000_H + +/* $Id: a3000.h,v 1.4 1997/01/19 23:07:10 davem Exp $ + * + * Header file for the Amiga 3000 built-in SCSI controller for Linux + * + * Written and (C) 1993, Hamish Macdonald, see a3000.c for more info + * + */ + +#include <linux/types.h> + +#ifndef CMD_PER_LUN +#define CMD_PER_LUN 2 +#endif + +#ifndef CAN_QUEUE +#define CAN_QUEUE 16 +#endif + +/* + * if the transfer address ANDed with this results in a non-zero + * result, then we can't use DMA. + */ +#define A3000_XFER_MASK (0x00000003) + +struct a3000_scsiregs { + unsigned char pad1[2]; + volatile unsigned short DAWR; + volatile unsigned int WTC; + unsigned char pad2[2]; + volatile unsigned short CNTR; + volatile unsigned long ACR; + unsigned char pad3[2]; + volatile unsigned short ST_DMA; + unsigned char pad4[2]; + volatile unsigned short FLUSH; + unsigned char pad5[2]; + volatile unsigned short CINT; + unsigned char pad6[2]; + volatile unsigned short ISTR; + unsigned char pad7[30]; + volatile unsigned short SP_DMA; + unsigned char pad8; + volatile unsigned char SASR; + unsigned char pad9; + volatile unsigned char SCMD; +}; + +#define DAWR_A3000 (3) + +/* CNTR bits. */ +#define CNTR_TCEN (1<<5) +#define CNTR_PREST (1<<4) +#define CNTR_PDMD (1<<3) +#define CNTR_INTEN (1<<2) +#define CNTR_DDIR (1<<1) +#define CNTR_IO_DX (1<<0) + +/* ISTR bits. */ +#define ISTR_INTX (1<<8) +#define ISTR_INT_F (1<<7) +#define ISTR_INTS (1<<6) +#define ISTR_E_INT (1<<5) +#define ISTR_INT_P (1<<4) +#define ISTR_UE_INT (1<<3) +#define ISTR_OE_INT (1<<2) +#define ISTR_FF_FLG (1<<1) +#define ISTR_FE_FLG (1<<0) + +#endif /* A3000_H */ |