| Message ID | 1457073455-11516-2-git-send-email-zhaoshenglong@huawei.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On Fri, 4 Mar 2016, Shannon Zhao wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > ACPI 6.0 introduces a new table STAO to list the devices which are used > by Xen and can't be used by Dom0. On Xen virtual platforms, the physical > UART is used by Xen. So here it hides UART from Dom0. > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> > --- > CC: "Rafael J. Wysocki" <rjw@rjwysocki.net> (supporter:ACPI) > CC: Len Brown <lenb@kernel.org> (supporter:ACPI) > CC: linux-acpi@vger.kernel.org (open list:ACPI) > --- > drivers/acpi/scan.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 68 insertions(+) > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 407a376..31d794c 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -45,6 +45,7 @@ static LIST_HEAD(acpi_scan_handlers_list); > DEFINE_MUTEX(acpi_device_lock); > LIST_HEAD(acpi_wakeup_device_list); > static DEFINE_MUTEX(acpi_hp_context_lock); > +static u64 spcr_uart_addr; > > struct acpi_dep_data { > struct list_head node; > @@ -1453,6 +1454,47 @@ static int acpi_add_single_object(struct acpi_device **child, > return 0; > } > > +static acpi_status acpi_get_resource_fixed_memory32(struct acpi_resource *res, > + void *context) > +{ > + struct acpi_resource_fixed_memory32 *fixed_memory32; > + > + if (res->type != ACPI_RESOURCE_TYPE_FIXED_MEMORY32) > + return AE_OK; > + > + fixed_memory32 = &res->data.fixed_memory32; Should we call acpi_resource_to_address64 instead? Aside from this the rest looks good. > + if (!fixed_memory32) > + return AE_OK; > + > + *((u32 *)context) = fixed_memory32->address; > + return AE_CTRL_TERMINATE; > +} > + > +static bool acpi_device_should_be_hidden(acpi_handle handle) > +{ > + acpi_status status; > + u32 addr = 0; > + > + /* Check if it should ignore the UART device */ > + if (spcr_uart_addr != 0) { > + if (!acpi_has_method(handle, METHOD_NAME__CRS)) > + return false; > + > + status = acpi_walk_resources(handle, METHOD_NAME__CRS, > + acpi_get_resource_fixed_memory32, > + &addr); > + if (ACPI_FAILURE(status)) > + return false; > + > + if (addr == spcr_uart_addr) { > + printk(KERN_INFO PREFIX "The UART device in SPCR table will be hidden\n"); > + return true; > + } > + } > + > + return false; > +} > + > static int acpi_bus_type_and_status(acpi_handle handle, int *type, > unsigned long long *sta) > { > @@ -1466,6 +1508,9 @@ static int acpi_bus_type_and_status(acpi_handle handle, int *type, > switch (acpi_type) { > case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ > case ACPI_TYPE_DEVICE: > + if (acpi_device_should_be_hidden(handle)) > + return -ENODEV; > + > *type = ACPI_BUS_TYPE_DEVICE; > status = acpi_bus_get_status_handle(handle, sta); > if (ACPI_FAILURE(status)) > @@ -1919,6 +1964,8 @@ static int acpi_bus_scan_fixed(void) > int __init acpi_scan_init(void) > { > int result; > + acpi_status status; > + struct acpi_table_stao *stao_ptr; > > acpi_pci_root_init(); > acpi_pci_link_init(); > @@ -1933,6 +1980,27 @@ int __init acpi_scan_init(void) > > acpi_scan_add_handler(&generic_device_handler); > > + /* If there is STAO table, check whether it needs to ignore the UART > + * device in SPCR table. > + */ > + status = acpi_get_table(ACPI_SIG_STAO, 0, > + (struct acpi_table_header **)&stao_ptr); > + if (ACPI_SUCCESS(status)) { > + if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) > + printk(KERN_INFO PREFIX "STAO Name List not yet supported."); > + > + if (stao_ptr->ignore_uart) { > + struct acpi_table_spcr *spcr_ptr; > + > + status = acpi_get_table(ACPI_SIG_SPCR, 0, > + (struct acpi_table_header **)&spcr_ptr); > + if (ACPI_SUCCESS(status)) > + spcr_uart_addr = spcr_ptr->serial_port.address; > + else > + printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n"); > + } > + } > + > mutex_lock(&acpi_scan_lock); > /* > * Enumerate devices in the ACPI namespace. > -- > 2.0.4 > > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, 4 Mar 2016, Shannon Zhao wrote: > On 2016/3/4 20:24, Stefano Stabellini wrote: > > On Fri, 4 Mar 2016, Shannon Zhao wrote: > > > >From: Shannon Zhao<shannon.zhao@linaro.org> > > > > > > > >ACPI 6.0 introduces a new table STAO to list the devices which are used > > > >by Xen and can't be used by Dom0. On Xen virtual platforms, the physical > > > >UART is used by Xen. So here it hides UART from Dom0. > > > > > > > >Signed-off-by: Shannon Zhao<shannon.zhao@linaro.org> > > > >--- > > > >CC: "Rafael J. Wysocki"<rjw@rjwysocki.net> (supporter:ACPI) > > > >CC: Len Brown<lenb@kernel.org> (supporter:ACPI) > > > >CC:linux-acpi@vger.kernel.org (open list:ACPI) > > > >--- > > > > drivers/acpi/scan.c | 68 > > > +++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > 1 file changed, 68 insertions(+) > > > > > > > >diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > > > >index 407a376..31d794c 100644 > > > >--- a/drivers/acpi/scan.c > > > >+++ b/drivers/acpi/scan.c > > > >@@ -45,6 +45,7 @@ static LIST_HEAD(acpi_scan_handlers_list); > > > > DEFINE_MUTEX(acpi_device_lock); > > > > LIST_HEAD(acpi_wakeup_device_list); > > > > static DEFINE_MUTEX(acpi_hp_context_lock); > > > >+static u64 spcr_uart_addr; > > > > > > > > struct acpi_dep_data { > > > > struct list_head node; > > > >@@ -1453,6 +1454,47 @@ static int acpi_add_single_object(struct > > > acpi_device **child, > > > > return 0; > > > > } > > > > > > > >+static acpi_status acpi_get_resource_fixed_memory32(struct acpi_resource > > > *res, > > > >+ void *context) > > > >+{ > > > >+ struct acpi_resource_fixed_memory32 *fixed_memory32; > > > >+ > > > >+ if (res->type != ACPI_RESOURCE_TYPE_FIXED_MEMORY32) > > > >+ return AE_OK; > > > >+ > > > >+ fixed_memory32 = &res->data.fixed_memory32; > > Should we call acpi_resource_to_address64 instead? > > Aside from this the rest looks good. > > > You mean the resource type could be other types? like > ACPI_RESOURCE_TYPE_ADDRESS64 or ACPI_RESOURCE_TYPE_ADDRESS32? So it needs to > convert them to ACPI_RESOURCE_TYPE_ADDRESS64 firstly? I meant to ask whether we need to check for other types of resources, in addition to ACPI_RESOURCE_TYPE_FIXED_MEMORY32. So maybe call an existing function that already does the check for us. acpi_dev_resource_memory is actually what I meant to suggest. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 407a376..31d794c 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -45,6 +45,7 @@ static LIST_HEAD(acpi_scan_handlers_list); DEFINE_MUTEX(acpi_device_lock); LIST_HEAD(acpi_wakeup_device_list); static DEFINE_MUTEX(acpi_hp_context_lock); +static u64 spcr_uart_addr; struct acpi_dep_data { struct list_head node; @@ -1453,6 +1454,47 @@ static int acpi_add_single_object(struct acpi_device **child, return 0; } +static acpi_status acpi_get_resource_fixed_memory32(struct acpi_resource *res, + void *context) +{ + struct acpi_resource_fixed_memory32 *fixed_memory32; + + if (res->type != ACPI_RESOURCE_TYPE_FIXED_MEMORY32) + return AE_OK; + + fixed_memory32 = &res->data.fixed_memory32; + if (!fixed_memory32) + return AE_OK; + + *((u32 *)context) = fixed_memory32->address; + return AE_CTRL_TERMINATE; +} + +static bool acpi_device_should_be_hidden(acpi_handle handle) +{ + acpi_status status; + u32 addr = 0; + + /* Check if it should ignore the UART device */ + if (spcr_uart_addr != 0) { + if (!acpi_has_method(handle, METHOD_NAME__CRS)) + return false; + + status = acpi_walk_resources(handle, METHOD_NAME__CRS, + acpi_get_resource_fixed_memory32, + &addr); + if (ACPI_FAILURE(status)) + return false; + + if (addr == spcr_uart_addr) { + printk(KERN_INFO PREFIX "The UART device in SPCR table will be hidden\n"); + return true; + } + } + + return false; +} + static int acpi_bus_type_and_status(acpi_handle handle, int *type, unsigned long long *sta) { @@ -1466,6 +1508,9 @@ static int acpi_bus_type_and_status(acpi_handle handle, int *type, switch (acpi_type) { case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ case ACPI_TYPE_DEVICE: + if (acpi_device_should_be_hidden(handle)) + return -ENODEV; + *type = ACPI_BUS_TYPE_DEVICE; status = acpi_bus_get_status_handle(handle, sta); if (ACPI_FAILURE(status)) @@ -1919,6 +1964,8 @@ static int acpi_bus_scan_fixed(void) int __init acpi_scan_init(void) { int result; + acpi_status status; + struct acpi_table_stao *stao_ptr; acpi_pci_root_init(); acpi_pci_link_init(); @@ -1933,6 +1980,27 @@ int __init acpi_scan_init(void) acpi_scan_add_handler(&generic_device_handler); + /* If there is STAO table, check whether it needs to ignore the UART + * device in SPCR table. + */ + status = acpi_get_table(ACPI_SIG_STAO, 0, + (struct acpi_table_header **)&stao_ptr); + if (ACPI_SUCCESS(status)) { + if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) + printk(KERN_INFO PREFIX "STAO Name List not yet supported."); + + if (stao_ptr->ignore_uart) { + struct acpi_table_spcr *spcr_ptr; + + status = acpi_get_table(ACPI_SIG_SPCR, 0, + (struct acpi_table_header **)&spcr_ptr); + if (ACPI_SUCCESS(status)) + spcr_uart_addr = spcr_ptr->serial_port.address; + else + printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n"); + } + } + mutex_lock(&acpi_scan_lock); /* * Enumerate devices in the ACPI namespace.