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APEI needs memory access in interrupt context. The obvious choice is
acpi_read(), but originally it couldn't be used in interrupt context
because it makes temporary mappings with ioremap(). Therefore, we added
drivers/acpi/atomicio.c, which provides:
acpi_pre_map_gar() -- ioremap in process context
acpi_atomic_read() -- memory access in interrupt context
acpi_post_unmap_gar() -- iounmap
Later we added acpi_os_map_generic_address() (2971852) and enhanced
acpi_read() so it works in interrupt context as long as the address has
been previously mapped (620242a). Now this sequence:
acpi_os_map_generic_address() -- ioremap in process context
acpi_read()/apei_read() -- now OK in interrupt context
acpi_os_unmap_generic_address()
is equivalent to what atomicio.c provides.
This patch introduces apei_read() and apei_write(), which currently are
functional equivalents of acpi_read() and acpi_write(). This is mainly
proactive, to prevent APEI breakages if acpi_read() and acpi_write()
are ever augmented to support the 'bit_offset' field of GAS, as APEI's
__apei_exec_write_register() precludes splitting up functionality
related to 'bit_offset' and APEI's 'mask' (see its
APEI_EXEC_PRESERVE_REGISTER block).
With apei_read() and apei_write() in place, usages of atomicio routines
are converted to apei_read()/apei_write() and existing calls within
osl.c and the CA, based on the re-factoring that was done in an earlier
patch series - http://marc.info/?l=linux-acpi&m=128769263327206&w=2:
acpi_pre_map_gar() --> acpi_os_map_generic_address()
acpi_post_unmap_gar() --> acpi_os_unmap_generic_address()
acpi_atomic_read() --> apei_read()
acpi_atomic_write() --> apei_write()
Note that acpi_read() and acpi_write() currently use 'bit_width'
for accessing GARs which seems incorrect. 'bit_width' is the size of
the register, while 'access_width' is the size of the access the
processor must generate on the bus. The 'access_width' may be larger,
for example, if the hardware only supports 32-bit or 64-bit reads. I
wanted to minimize any possible impacts with this patch series so I
did *not* change this behavior.
Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>
136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/*
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* apei-internal.h - ACPI Platform Error Interface internal
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* definations.
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*/
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#ifndef APEI_INTERNAL_H
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#define APEI_INTERNAL_H
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#include <linux/cper.h>
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struct apei_exec_context;
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typedef int (*apei_exec_ins_func_t)(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry);
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#define APEI_EXEC_INS_ACCESS_REGISTER 0x0001
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struct apei_exec_ins_type {
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u32 flags;
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apei_exec_ins_func_t run;
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};
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struct apei_exec_context {
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u32 ip;
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u64 value;
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u64 var1;
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u64 var2;
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u64 src_base;
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u64 dst_base;
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struct apei_exec_ins_type *ins_table;
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u32 instructions;
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struct acpi_whea_header *action_table;
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u32 entries;
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};
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void apei_exec_ctx_init(struct apei_exec_context *ctx,
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struct apei_exec_ins_type *ins_table,
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u32 instructions,
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struct acpi_whea_header *action_table,
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u32 entries);
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static inline void apei_exec_ctx_set_input(struct apei_exec_context *ctx,
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u64 input)
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{
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ctx->value = input;
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}
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static inline u64 apei_exec_ctx_get_output(struct apei_exec_context *ctx)
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{
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return ctx->value;
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}
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int __apei_exec_run(struct apei_exec_context *ctx, u8 action, bool optional);
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static inline int apei_exec_run(struct apei_exec_context *ctx, u8 action)
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{
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return __apei_exec_run(ctx, action, 0);
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}
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/* It is optional whether the firmware provides the action */
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static inline int apei_exec_run_optional(struct apei_exec_context *ctx, u8 action)
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{
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return __apei_exec_run(ctx, action, 1);
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}
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/* Common instruction implementation */
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/* IP has been set in instruction function */
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#define APEI_EXEC_SET_IP 1
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int apei_read(u64 *val, struct acpi_generic_address *reg);
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int apei_write(u64 val, struct acpi_generic_address *reg);
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int __apei_exec_read_register(struct acpi_whea_header *entry, u64 *val);
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int __apei_exec_write_register(struct acpi_whea_header *entry, u64 val);
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int apei_exec_read_register(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry);
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int apei_exec_read_register_value(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry);
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int apei_exec_write_register(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry);
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int apei_exec_write_register_value(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry);
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int apei_exec_noop(struct apei_exec_context *ctx,
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struct acpi_whea_header *entry);
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int apei_exec_pre_map_gars(struct apei_exec_context *ctx);
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int apei_exec_post_unmap_gars(struct apei_exec_context *ctx);
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struct apei_resources {
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struct list_head iomem;
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struct list_head ioport;
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};
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static inline void apei_resources_init(struct apei_resources *resources)
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{
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INIT_LIST_HEAD(&resources->iomem);
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INIT_LIST_HEAD(&resources->ioport);
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}
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void apei_resources_fini(struct apei_resources *resources);
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int apei_resources_add(struct apei_resources *resources,
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unsigned long start, unsigned long size,
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bool iomem);
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int apei_resources_sub(struct apei_resources *resources1,
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struct apei_resources *resources2);
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int apei_resources_request(struct apei_resources *resources,
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const char *desc);
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void apei_resources_release(struct apei_resources *resources);
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int apei_exec_collect_resources(struct apei_exec_context *ctx,
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struct apei_resources *resources);
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struct dentry;
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struct dentry *apei_get_debugfs_dir(void);
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#define apei_estatus_for_each_section(estatus, section) \
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for (section = (struct acpi_hest_generic_data *)(estatus + 1); \
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(void *)section - (void *)estatus < estatus->data_length; \
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section = (void *)(section+1) + section->error_data_length)
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static inline u32 apei_estatus_len(struct acpi_hest_generic_status *estatus)
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{
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if (estatus->raw_data_length)
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return estatus->raw_data_offset + \
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estatus->raw_data_length;
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else
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return sizeof(*estatus) + estatus->data_length;
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}
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void apei_estatus_print(const char *pfx,
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const struct acpi_hest_generic_status *estatus);
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int apei_estatus_check_header(const struct acpi_hest_generic_status *estatus);
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int apei_estatus_check(const struct acpi_hest_generic_status *estatus);
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int apei_osc_setup(void);
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#endif
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