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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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dbdf20db53
This is a mixture ofcMichael McTernan's patch and the existing cplb-mpu code.
We ditch the old cplb-nompu implementation, which is a good example of
why a good algorithm in a HLL is preferrable to a bad algorithm written in
assembly. Rather than try to construct a table of all posible CPLBs and
search it, we just create a (smaller) table of memory regions and
their attributes. Some of the data structures are now unified for both
the mpu and nompu cases. A lot of needless complexity in cplbinit.c is
removed.
Further optimizations:
* compile cplbmgr.c with a lot of -ffixed-reg options, and omit saving
these registers on the stack when entering a CPLB exception.
* lose cli/nop/nop/sti sequences for some workarounds - these don't
* make
sense in an exception context
Additional code unification should be possible after this.
[Mike Frysinger <vapier.adi@gmail.com>:
- convert CPP if statements to C if statements
- remove redundant statements
- use a do...while loop rather than a for loop to get slightly better
optimization and to avoid gcc "may be used uninitialized" warnings ...
we know that the [id]cplb_nr_bounds variables will never be 0, so this
is OK
- the no-mpu code was the last user of MAX_MEM_SIZE and with that rewritten,
we can punt it
- add some BUG_ON() checks to make sure we dont overflow the small
cplb_bounds array
- add i/d cplb entries for the bootrom because there is functions/data in
there we want to access
- we do not need a NULL trailing entry as any time we access the bounds
arrays, we use the nr_bounds variable
]
Signed-off-by: Michael McTernan <mmcternan@airvana.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
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|---|---|---|
| .. | ||
| cplb-mpu | ||
| cplb-nompu | ||
| asm-offsets.c | ||
| bfin_dma_5xx.c | ||
| bfin_gpio.c | ||
| bfin_ksyms.c | ||
| cplbinfo.c | ||
| dma-mapping.c | ||
| early_printk.c | ||
| entry.S | ||
| fixed_code.S | ||
| flat.c | ||
| gptimers.c | ||
| init_task.c | ||
| irqchip.c | ||
| kgdb.c | ||
| Makefile | ||
| module.c | ||
| process.c | ||
| ptrace.c | ||
| reboot.c | ||
| setup.c | ||
| signal.c | ||
| sys_bfin.c | ||
| time-ts.c | ||
| time.c | ||
| traps.c | ||
| vmlinux.lds.S | ||