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powerpc/vas: Define vas_win_paste_addr()

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Define an interface that the NX drivers can use to find the physical
paste address of a send window. This interface is expected to be used
with the mmap() operation of the NX driver's device. i.e the user space
process can use driver's mmap() operation to map the send window's paste
address into their address space and then use copy and paste instructions
to submit the CRBs to the NX engine.

Note that kernel drivers will use vas_paste_crb() directly and don't need
this interface.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu 2017-11-07 18:23:56 -08:00 committed by Michael Ellerman
parent 9d2a4d7133
commit 5676be2fb7
2 changed files with 17 additions and 0 deletions
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7
arch/powerpc/include/asm/vas.h
View File

@ -10,6 +10,8 @@
#ifndef _ASM_POWERPC_VAS_H
#define _ASM_POWERPC_VAS_H
struct vas_window;
/*
* Min and max FIFO sizes are based on Version 1.05 Section 3.1.4.25
* (Local FIFO Size Register) of the VAS workbook.
@ -165,4 +167,9 @@ int vas_copy_crb(void *crb, int offset);
*/
int vas_paste_crb(struct vas_window *win, int offset, bool re);
/*
* Return the power bus paste address associated with @win so the caller
* can map that address into their address space.
*/
extern u64 vas_win_paste_addr(struct vas_window *win);
#endif /* __ASM_POWERPC_VAS_H */

10
arch/powerpc/platforms/powernv/vas-window.c
View File

@ -40,6 +40,16 @@ static void compute_paste_address(struct vas_window *window, u64 *addr, int *len
pr_debug("Txwin #%d: Paste addr 0x%llx\n", winid, *addr);
}
u64 vas_win_paste_addr(struct vas_window *win)
{
u64 addr;
compute_paste_address(win, &addr, NULL);
return addr;
}
EXPORT_SYMBOL(vas_win_paste_addr);
static inline void get_hvwc_mmio_bar(struct vas_window *window,
u64 *start, int *len)
{