| Message ID | 20240607141809.1637137-3-ribalda@chromium.org |
|---|---|
| State | New |
| Headers | show |
| Series | hw/i386/acpi: Pre-compute the _PRT table | expand |
On Fri, 7 Jun 2024 14:17:25 +0000 Ricardo Ribalda <ribalda@chromium.org> wrote: > When qemu runs without kvm acceleration the ACPI executions take a great > amount of time. If they take more than the default time (30sec), the > ACPI calls fail and the system might not behave correctly. > > Now the _PRT table is computed on the fly. We can drastically reduce the > execution of the _PRT method if we return a pre-computed table. > > Without this patch: > [ 51.343484] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) > [ 51.527032] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) > [ 51.530049] virtio-pci 0000:00:02.0: can't derive routing for PCI INT A > [ 51.530797] virtio-pci 0000:00:02.0: PCI INT A: no GSI > [ 81.922901] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) > [ 82.103534] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) > [ 82.106088] virtio-pci 0000:00:04.0: can't derive routing for PCI INT A > [ 82.106761] virtio-pci 0000:00:04.0: PCI INT A: no GSI > [ 112.192568] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) > [ 112.486687] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) > [ 112.489554] virtio-pci 0000:00:05.0: can't derive routing for PCI INT A > [ 112.490027] virtio-pci 0000:00:05.0: PCI INT A: no GSI > [ 142.559448] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) > [ 142.718596] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) > [ 142.722889] virtio-pci 0000:00:06.0: can't derive routing for PCI INT A > [ 142.724578] virtio-pci 0000:00:06.0: PCI INT A: no GSI > > With this patch: > [ 22.938076] ACPI: \_SB_.LNKB: Enabled at IRQ 10 > [ 24.214002] ACPI: \_SB_.LNKD: Enabled at IRQ 11 > [ 25.465170] ACPI: \_SB_.LNKA: Enabled at IRQ 10 > [ 27.944920] ACPI: \_SB_.LNKC: Enabled at IRQ 11 > > ACPI disassembly: > Scope (PCI0) > { > Method (_PRT, 0, NotSerialized) // _PRT: PCI Routing Table > { > Return (Package (0x80) > { > Package (0x04) > { > 0xFFFF, > Zero, > LNKD, > Zero > }, > > Package (0x04) > { > 0xFFFF, > One, > LNKA, > Zero > }, > > Package (0x04) > { > 0xFFFF, > 0x02, > LNKB, > Zero > }, > > Package (0x04) > { > 0xFFFF, > 0x03, > LNKC, > Zero > }, > > Package (0x04) > { > 0x0001FFFF, > Zero, > LNKS, > Zero > }, > Context: https://lore.kernel.org/virtualization/20240417145544.38d7b482@imammedo.users.ipa.redhat.com/T/#t > > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> Reviewed-by: Igor Mammedov <imammedo@redhat.com> > --- > hw/i386/acpi-build.c | 120 ++++++++----------------------------------- > 1 file changed, 22 insertions(+), 98 deletions(-) > > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c > index 53f804ac16..03216a6f29 100644 > --- a/hw/i386/acpi-build.c > +++ b/hw/i386/acpi-build.c > @@ -725,120 +725,44 @@ static Aml *aml_pci_pdsm(void) > return method; > } > > -/** > - * build_prt_entry: > - * @link_name: link name for PCI route entry > - * > - * build AML package containing a PCI route entry for @link_name > - */ > -static Aml *build_prt_entry(const char *link_name) > -{ > - Aml *a_zero = aml_int(0); > - Aml *pkg = aml_package(4); > - aml_append(pkg, a_zero); > - aml_append(pkg, a_zero); > - aml_append(pkg, aml_name("%s", link_name)); > - aml_append(pkg, a_zero); > - return pkg; > -} > - > /* > - * initialize_route - Initialize the interrupt routing rule > - * through a specific LINK: > - * if (lnk_idx == idx) > - * route using link 'link_name' > - */ > -static Aml *initialize_route(Aml *route, const char *link_name, > - Aml *lnk_idx, int idx) > -{ > - Aml *if_ctx = aml_if(aml_equal(lnk_idx, aml_int(idx))); > - Aml *pkg = build_prt_entry(link_name); > - > - aml_append(if_ctx, aml_store(pkg, route)); > - > - return if_ctx; > -} > - > -/* > - * build_prt - Define interrupt rounting rules > + * build_prt - Define interrupt routing rules > * > * Returns an array of 128 routes, one for each device, > * based on device location. > * The main goal is to equally distribute the interrupts > * over the 4 existing ACPI links (works only for i440fx). > - * The hash function is (slot + pin) & 3 -> "LNK[D|A|B|C]". > + * The hash function is: (slot + pin) & 3 -> "LNK[D|A|B|C]". > * > */ > static Aml *build_prt(bool is_pci0_prt) > { > - Aml *method, *while_ctx, *pin, *res; > + const int nroutes = 128; > + Aml *rt_pkg, *method; > + int pin; > > method = aml_method("_PRT", 0, AML_NOTSERIALIZED); > - res = aml_local(0); > - pin = aml_local(1); > - aml_append(method, aml_store(aml_package(128), res)); > - aml_append(method, aml_store(aml_int(0), pin)); > + rt_pkg = aml_varpackage(nroutes); > > - /* while (pin < 128) */ > - while_ctx = aml_while(aml_lless(pin, aml_int(128))); > - { > - Aml *slot = aml_local(2); > - Aml *lnk_idx = aml_local(3); > - Aml *route = aml_local(4); > - > - /* slot = pin >> 2 */ > - aml_append(while_ctx, > - aml_store(aml_shiftright(pin, aml_int(2), NULL), slot)); > - /* lnk_idx = (slot + pin) & 3 */ > - aml_append(while_ctx, > - aml_store(aml_and(aml_add(pin, slot, NULL), aml_int(3), NULL), > - lnk_idx)); > - > - /* route[2] = "LNK[D|A|B|C]", selection based on pin % 3 */ > - aml_append(while_ctx, initialize_route(route, "LNKD", lnk_idx, 0)); > - if (is_pci0_prt) { > - Aml *if_device_1, *if_pin_4, *else_pin_4; > - > - /* device 1 is the power-management device, needs SCI */ > - if_device_1 = aml_if(aml_equal(lnk_idx, aml_int(1))); > - { > - if_pin_4 = aml_if(aml_equal(pin, aml_int(4))); > - { > - aml_append(if_pin_4, > - aml_store(build_prt_entry("LNKS"), route)); > - } > - aml_append(if_device_1, if_pin_4); > - else_pin_4 = aml_else(); > - { > - aml_append(else_pin_4, > - aml_store(build_prt_entry("LNKA"), route)); > - } > - aml_append(if_device_1, else_pin_4); > - } > - aml_append(while_ctx, if_device_1); > + for (pin = 0; pin < nroutes; pin++) { > + Aml *pkg = aml_package(4); > + int slot = pin >> 2; > + > + aml_append(pkg, aml_int((slot << 16) | 0xFFFF)); > + aml_append(pkg, aml_int(pin & 3)); > + /* device 1 is the power-management device, needs SCI */ > + if (is_pci0_prt && pin == 4) { > + aml_append(pkg, aml_name("%s", "LNKS")); > } else { > - aml_append(while_ctx, initialize_route(route, "LNKA", lnk_idx, 1)); > + const char link_name[][5] = {"LNKD", "LNKA", "LNKB", "LNKC"}; > + int hash = (slot + pin) & 3; > + aml_append(pkg, aml_name("%s", link_name[hash])); > } > - aml_append(while_ctx, initialize_route(route, "LNKB", lnk_idx, 2)); > - aml_append(while_ctx, initialize_route(route, "LNKC", lnk_idx, 3)); > - > - /* route[0] = 0x[slot]FFFF */ > - aml_append(while_ctx, > - aml_store(aml_or(aml_shiftleft(slot, aml_int(16)), aml_int(0xFFFF), > - NULL), > - aml_index(route, aml_int(0)))); > - /* route[1] = pin & 3 */ > - aml_append(while_ctx, > - aml_store(aml_and(pin, aml_int(3), NULL), > - aml_index(route, aml_int(1)))); > - /* res[pin] = route */ > - aml_append(while_ctx, aml_store(route, aml_index(res, pin))); > - /* pin++ */ > - aml_append(while_ctx, aml_increment(pin)); > + aml_append(pkg, aml_int(0)); > + aml_append(rt_pkg, pkg); > } > - aml_append(method, while_ctx); > - /* return res*/ > - aml_append(method, aml_return(res)); > + > + aml_append(method, aml_return(rt_pkg)); > > return method; > }
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 53f804ac16..03216a6f29 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -725,120 +725,44 @@ static Aml *aml_pci_pdsm(void) return method; } -/** - * build_prt_entry: - * @link_name: link name for PCI route entry - * - * build AML package containing a PCI route entry for @link_name - */ -static Aml *build_prt_entry(const char *link_name) -{ - Aml *a_zero = aml_int(0); - Aml *pkg = aml_package(4); - aml_append(pkg, a_zero); - aml_append(pkg, a_zero); - aml_append(pkg, aml_name("%s", link_name)); - aml_append(pkg, a_zero); - return pkg; -} - /* - * initialize_route - Initialize the interrupt routing rule - * through a specific LINK: - * if (lnk_idx == idx) - * route using link 'link_name' - */ -static Aml *initialize_route(Aml *route, const char *link_name, - Aml *lnk_idx, int idx) -{ - Aml *if_ctx = aml_if(aml_equal(lnk_idx, aml_int(idx))); - Aml *pkg = build_prt_entry(link_name); - - aml_append(if_ctx, aml_store(pkg, route)); - - return if_ctx; -} - -/* - * build_prt - Define interrupt rounting rules + * build_prt - Define interrupt routing rules * * Returns an array of 128 routes, one for each device, * based on device location. * The main goal is to equally distribute the interrupts * over the 4 existing ACPI links (works only for i440fx). - * The hash function is (slot + pin) & 3 -> "LNK[D|A|B|C]". + * The hash function is: (slot + pin) & 3 -> "LNK[D|A|B|C]". * */ static Aml *build_prt(bool is_pci0_prt) { - Aml *method, *while_ctx, *pin, *res; + const int nroutes = 128; + Aml *rt_pkg, *method; + int pin; method = aml_method("_PRT", 0, AML_NOTSERIALIZED); - res = aml_local(0); - pin = aml_local(1); - aml_append(method, aml_store(aml_package(128), res)); - aml_append(method, aml_store(aml_int(0), pin)); + rt_pkg = aml_varpackage(nroutes); - /* while (pin < 128) */ - while_ctx = aml_while(aml_lless(pin, aml_int(128))); - { - Aml *slot = aml_local(2); - Aml *lnk_idx = aml_local(3); - Aml *route = aml_local(4); - - /* slot = pin >> 2 */ - aml_append(while_ctx, - aml_store(aml_shiftright(pin, aml_int(2), NULL), slot)); - /* lnk_idx = (slot + pin) & 3 */ - aml_append(while_ctx, - aml_store(aml_and(aml_add(pin, slot, NULL), aml_int(3), NULL), - lnk_idx)); - - /* route[2] = "LNK[D|A|B|C]", selection based on pin % 3 */ - aml_append(while_ctx, initialize_route(route, "LNKD", lnk_idx, 0)); - if (is_pci0_prt) { - Aml *if_device_1, *if_pin_4, *else_pin_4; - - /* device 1 is the power-management device, needs SCI */ - if_device_1 = aml_if(aml_equal(lnk_idx, aml_int(1))); - { - if_pin_4 = aml_if(aml_equal(pin, aml_int(4))); - { - aml_append(if_pin_4, - aml_store(build_prt_entry("LNKS"), route)); - } - aml_append(if_device_1, if_pin_4); - else_pin_4 = aml_else(); - { - aml_append(else_pin_4, - aml_store(build_prt_entry("LNKA"), route)); - } - aml_append(if_device_1, else_pin_4); - } - aml_append(while_ctx, if_device_1); + for (pin = 0; pin < nroutes; pin++) { + Aml *pkg = aml_package(4); + int slot = pin >> 2; + + aml_append(pkg, aml_int((slot << 16) | 0xFFFF)); + aml_append(pkg, aml_int(pin & 3)); + /* device 1 is the power-management device, needs SCI */ + if (is_pci0_prt && pin == 4) { + aml_append(pkg, aml_name("%s", "LNKS")); } else { - aml_append(while_ctx, initialize_route(route, "LNKA", lnk_idx, 1)); + const char link_name[][5] = {"LNKD", "LNKA", "LNKB", "LNKC"}; + int hash = (slot + pin) & 3; + aml_append(pkg, aml_name("%s", link_name[hash])); } - aml_append(while_ctx, initialize_route(route, "LNKB", lnk_idx, 2)); - aml_append(while_ctx, initialize_route(route, "LNKC", lnk_idx, 3)); - - /* route[0] = 0x[slot]FFFF */ - aml_append(while_ctx, - aml_store(aml_or(aml_shiftleft(slot, aml_int(16)), aml_int(0xFFFF), - NULL), - aml_index(route, aml_int(0)))); - /* route[1] = pin & 3 */ - aml_append(while_ctx, - aml_store(aml_and(pin, aml_int(3), NULL), - aml_index(route, aml_int(1)))); - /* res[pin] = route */ - aml_append(while_ctx, aml_store(route, aml_index(res, pin))); - /* pin++ */ - aml_append(while_ctx, aml_increment(pin)); + aml_append(pkg, aml_int(0)); + aml_append(rt_pkg, pkg); } - aml_append(method, while_ctx); - /* return res*/ - aml_append(method, aml_return(res)); + + aml_append(method, aml_return(rt_pkg)); return method; }
When qemu runs without kvm acceleration the ACPI executions take a great amount of time. If they take more than the default time (30sec), the ACPI calls fail and the system might not behave correctly. Now the _PRT table is computed on the fly. We can drastically reduce the execution of the _PRT method if we return a pre-computed table. Without this patch: [ 51.343484] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) [ 51.527032] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) [ 51.530049] virtio-pci 0000:00:02.0: can't derive routing for PCI INT A [ 51.530797] virtio-pci 0000:00:02.0: PCI INT A: no GSI [ 81.922901] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) [ 82.103534] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) [ 82.106088] virtio-pci 0000:00:04.0: can't derive routing for PCI INT A [ 82.106761] virtio-pci 0000:00:04.0: PCI INT A: no GSI [ 112.192568] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) [ 112.486687] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) [ 112.489554] virtio-pci 0000:00:05.0: can't derive routing for PCI INT A [ 112.490027] virtio-pci 0000:00:05.0: PCI INT A: no GSI [ 142.559448] ACPI Error: Aborting method \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/psparse-529) [ 142.718596] ACPI Error: Method execution failed \_SB.PCI0._PRT due to previous error (AE_AML_LOOP_TIMEOUT) (20230628/uteval-68) [ 142.722889] virtio-pci 0000:00:06.0: can't derive routing for PCI INT A [ 142.724578] virtio-pci 0000:00:06.0: PCI INT A: no GSI With this patch: [ 22.938076] ACPI: \_SB_.LNKB: Enabled at IRQ 10 [ 24.214002] ACPI: \_SB_.LNKD: Enabled at IRQ 11 [ 25.465170] ACPI: \_SB_.LNKA: Enabled at IRQ 10 [ 27.944920] ACPI: \_SB_.LNKC: Enabled at IRQ 11 ACPI disassembly: Scope (PCI0) { Method (_PRT, 0, NotSerialized) // _PRT: PCI Routing Table { Return (Package (0x80) { Package (0x04) { 0xFFFF, Zero, LNKD, Zero }, Package (0x04) { 0xFFFF, One, LNKA, Zero }, Package (0x04) { 0xFFFF, 0x02, LNKB, Zero }, Package (0x04) { 0xFFFF, 0x03, LNKC, Zero }, Package (0x04) { 0x0001FFFF, Zero, LNKS, Zero }, Context: https://lore.kernel.org/virtualization/20240417145544.38d7b482@imammedo.users.ipa.redhat.com/T/#t Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> --- hw/i386/acpi-build.c | 120 ++++++++----------------------------------- 1 file changed, 22 insertions(+), 98 deletions(-)