| Message ID | 20191216140235.10751-9-eric.auger@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm/arm64: Add ITS tests | expand |
Hi Eric, On 2019/12/16 22:02, Eric Auger wrote: > Allocate the command queue and initialize related registers: > CBASER, CREADR, CWRITER. > > The command queue is 64kB. This aims at not bothing with fullness. > > Signed-off-by: Eric Auger <eric.auger@redhat.com> > --- > lib/arm/asm/gic-v3-its.h | 7 +++++++ > lib/arm/gic-v3-its.c | 37 +++++++++++++++++++++++++++++++++++++ > 2 files changed, 44 insertions(+) > > diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h > index 0d11aed..ed42707 100644 > --- a/lib/arm/asm/gic-v3-its.h > +++ b/lib/arm/asm/gic-v3-its.h > @@ -113,10 +113,17 @@ struct its_baser { > int esz; > }; > > +struct its_cmd_block { > + u64 raw_cmd[4]; > +}; > + > struct its_data { > void *base; > struct its_typer typer; > struct its_baser baser[GITS_BASER_NR_REGS]; > + struct its_cmd_block *cmd_base; > + struct its_cmd_block *cmd_write; > + struct its_cmd_block *cmd_readr; I think we can just get rid of the 'cmd_readr'. As GITS_CREADR is generally manipulated by the ITS, and ... > }; > > extern struct its_data its_data; > diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c > index 0b5a700..8b6a095 100644 > --- a/lib/arm/gic-v3-its.c > +++ b/lib/arm/gic-v3-its.c > @@ -188,3 +188,40 @@ void set_pending_table_bit(int rdist, int n, bool set) > byte &= ~mask; > *ptr = byte; > } > + > +/** > + * init_cmd_queue: Allocate the command queue and initialize > + * CBASER, CREADR, CWRITER > + */ > +void init_cmd_queue(void); > +void init_cmd_queue(void) > +{ > + unsigned long n = SZ_64K >> PAGE_SHIFT; > + unsigned long order = fls(n); > + u64 cbaser, tmp; > + > + its_data.cmd_base = (void *)virt_to_phys(alloc_pages(order)); > + > + cbaser = ((u64)its_data.cmd_base | > + GITS_CBASER_WaWb | > + GITS_CBASER_InnerShareable | > + (SZ_64K / SZ_4K - 1) | > + GITS_CBASER_VALID); > + > + writeq(cbaser, its_data.base + GITS_CBASER); ..."(CREADR) is cleared to 0 when a value is written to GITS_CBASER." -- from IHI0069E 9.19.3 > + tmp = readq(its_data.base + GITS_CBASER); > + > + if ((tmp ^ cbaser) & GITS_CBASER_SHAREABILITY_MASK) { > + if (!(tmp & GITS_CBASER_SHAREABILITY_MASK)) { > + cbaser &= ~(GITS_CBASER_SHAREABILITY_MASK | > + GITS_CBASER_CACHEABILITY_MASK); > + cbaser |= GITS_CBASER_nC; > + writeq(cbaser, its_data.base + GITS_CBASER); > + } > + } > + > + its_data.cmd_write = its_data.cmd_base; > + its_data.cmd_readr = its_data.cmd_base; > + writeq(0, its_data.base + GITS_CWRITER); > + writeq(0, its_data.base + GITS_CREADR); So this writeq() is also not needed. Or I've just missed the point that this is done by intention to test "whether the GITS_CREADR implemented by KVM is Write Ignored"? If so, please ignore all of the comments above :) Thanks, Zenghui
Hi Zenghui, On 12/20/19 8:10 AM, Zenghui Yu wrote: > Hi Eric, > > On 2019/12/16 22:02, Eric Auger wrote: >> Allocate the command queue and initialize related registers: >> CBASER, CREADR, CWRITER. >> >> The command queue is 64kB. This aims at not bothing with fullness. >> >> Signed-off-by: Eric Auger <eric.auger@redhat.com> >> --- >> lib/arm/asm/gic-v3-its.h | 7 +++++++ >> lib/arm/gic-v3-its.c | 37 +++++++++++++++++++++++++++++++++++++ >> 2 files changed, 44 insertions(+) >> >> diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h >> index 0d11aed..ed42707 100644 >> --- a/lib/arm/asm/gic-v3-its.h >> +++ b/lib/arm/asm/gic-v3-its.h >> @@ -113,10 +113,17 @@ struct its_baser { >> int esz; >> }; >> +struct its_cmd_block { >> + u64 raw_cmd[4]; >> +}; >> + >> struct its_data { >> void *base; >> struct its_typer typer; >> struct its_baser baser[GITS_BASER_NR_REGS]; >> + struct its_cmd_block *cmd_base; >> + struct its_cmd_block *cmd_write; >> + struct its_cmd_block *cmd_readr; > > I think we can just get rid of the 'cmd_readr'. As GITS_CREADR is > generally manipulated by the ITS, and ... > >> }; >> extern struct its_data its_data; >> diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c >> index 0b5a700..8b6a095 100644 >> --- a/lib/arm/gic-v3-its.c >> +++ b/lib/arm/gic-v3-its.c >> @@ -188,3 +188,40 @@ void set_pending_table_bit(int rdist, int n, bool >> set) >> byte &= ~mask; >> *ptr = byte; >> } >> + >> +/** >> + * init_cmd_queue: Allocate the command queue and initialize >> + * CBASER, CREADR, CWRITER >> + */ >> +void init_cmd_queue(void); >> +void init_cmd_queue(void) >> +{ >> + unsigned long n = SZ_64K >> PAGE_SHIFT; >> + unsigned long order = fls(n); >> + u64 cbaser, tmp; >> + >> + its_data.cmd_base = (void *)virt_to_phys(alloc_pages(order)); >> + >> + cbaser = ((u64)its_data.cmd_base | >> + GITS_CBASER_WaWb | >> + GITS_CBASER_InnerShareable | >> + (SZ_64K / SZ_4K - 1) | >> + GITS_CBASER_VALID); >> + >> + writeq(cbaser, its_data.base + GITS_CBASER); > > ..."(CREADR) is cleared to 0 when a value is written to GITS_CBASER." > -- from IHI0069E 9.19.3 > >> + tmp = readq(its_data.base + GITS_CBASER); >> + >> + if ((tmp ^ cbaser) & GITS_CBASER_SHAREABILITY_MASK) { >> + if (!(tmp & GITS_CBASER_SHAREABILITY_MASK)) { >> + cbaser &= ~(GITS_CBASER_SHAREABILITY_MASK | >> + GITS_CBASER_CACHEABILITY_MASK); >> + cbaser |= GITS_CBASER_nC; >> + writeq(cbaser, its_data.base + GITS_CBASER); >> + } >> + } >> + >> + its_data.cmd_write = its_data.cmd_base; >> + its_data.cmd_readr = its_data.cmd_base; >> + writeq(0, its_data.base + GITS_CWRITER); >> + writeq(0, its_data.base + GITS_CREADR); > > So this writeq() is also not needed. > > Or I've just missed the point that this is done by intention to test > "whether the GITS_CREADR implemented by KVM is Write Ignored"? > If so, please ignore all of the comments above :) No I must admit this was not done on purpose. I can remove it from the its_data struct at the moment. Thanks Eric > > > Thanks, > Zenghui >
diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h index 0d11aed..ed42707 100644 --- a/lib/arm/asm/gic-v3-its.h +++ b/lib/arm/asm/gic-v3-its.h @@ -113,10 +113,17 @@ struct its_baser { int esz; }; +struct its_cmd_block { + u64 raw_cmd[4]; +}; + struct its_data { void *base; struct its_typer typer; struct its_baser baser[GITS_BASER_NR_REGS]; + struct its_cmd_block *cmd_base; + struct its_cmd_block *cmd_write; + struct its_cmd_block *cmd_readr; }; extern struct its_data its_data; diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c index 0b5a700..8b6a095 100644 --- a/lib/arm/gic-v3-its.c +++ b/lib/arm/gic-v3-its.c @@ -188,3 +188,40 @@ void set_pending_table_bit(int rdist, int n, bool set) byte &= ~mask; *ptr = byte; } + +/** + * init_cmd_queue: Allocate the command queue and initialize + * CBASER, CREADR, CWRITER + */ +void init_cmd_queue(void); +void init_cmd_queue(void) +{ + unsigned long n = SZ_64K >> PAGE_SHIFT; + unsigned long order = fls(n); + u64 cbaser, tmp; + + its_data.cmd_base = (void *)virt_to_phys(alloc_pages(order)); + + cbaser = ((u64)its_data.cmd_base | + GITS_CBASER_WaWb | + GITS_CBASER_InnerShareable | + (SZ_64K / SZ_4K - 1) | + GITS_CBASER_VALID); + + writeq(cbaser, its_data.base + GITS_CBASER); + tmp = readq(its_data.base + GITS_CBASER); + + if ((tmp ^ cbaser) & GITS_CBASER_SHAREABILITY_MASK) { + if (!(tmp & GITS_CBASER_SHAREABILITY_MASK)) { + cbaser &= ~(GITS_CBASER_SHAREABILITY_MASK | + GITS_CBASER_CACHEABILITY_MASK); + cbaser |= GITS_CBASER_nC; + writeq(cbaser, its_data.base + GITS_CBASER); + } + } + + its_data.cmd_write = its_data.cmd_base; + its_data.cmd_readr = its_data.cmd_base; + writeq(0, its_data.base + GITS_CWRITER); + writeq(0, its_data.base + GITS_CREADR); +}
Allocate the command queue and initialize related registers: CBASER, CREADR, CWRITER. The command queue is 64kB. This aims at not bothing with fullness. Signed-off-by: Eric Auger <eric.auger@redhat.com> --- lib/arm/asm/gic-v3-its.h | 7 +++++++ lib/arm/gic-v3-its.c | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+)