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c61cfb941d
Finally the code handles the IPA memory region array in the configuration data without assuming it is indexed by region ID. Get rid of the array index designators where these arrays are initialized. As a result, there's no more need to define an explicitly undefined memory region ID, so get rid of that. Change ipa_mem_find() so it no longer assumes the ipa->mem[] array is indexed by memory region ID. Instead, have it search the array for the entry having the requested memory ID, and return the address of the descriptor if found. Otherwise return NULL. Stop allowing memory regions to be defined with zero size and zero canary value. Check for this condition in ipa_mem_valid_one(). As a result, it is not necessary to check for this case in ipa_mem_config(). Finally, there is no need for IPA_MEM_UNDEFINED to be defined any more, so get rid of it. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
105 lines
3.8 KiB
C
105 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2019-2021 Linaro Ltd.
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*/
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#ifndef _IPA_MEM_H_
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#define _IPA_MEM_H_
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struct ipa;
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struct ipa_mem_data;
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/**
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* DOC: IPA Local Memory
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*
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* The IPA has a block of shared memory, divided into regions used for
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* specific purposes.
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*
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* The regions within the shared block are bounded by an offset (relative to
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* the "ipa-shared" memory range) and size found in the IPA_SHARED_MEM_SIZE
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* register.
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*
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* Each region is optionally preceded by one or more 32-bit "canary" values.
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* These are meant to detect out-of-range writes (if they become corrupted).
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* A given region (such as a filter or routing table) has the same number
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* of canaries for all IPA hardware versions. Still, the number used is
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* defined in the config data, allowing for generic handling of regions.
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*
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* The set of memory regions is defined in configuration data. They are
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* subject to these constraints:
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* - a zero offset and zero size represents and undefined region
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* - a region's size does not include space for its "canary" values
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* - a region's offset is defined to be *past* all "canary" values
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* - offset must be large enough to account for all canaries
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* - a region's size may be zero, but may still have canaries
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* - all offsets must be 8-byte aligned
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* - most sizes must be a multiple of 8
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* - modem memory size must be a multiple of 4
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* - the microcontroller ring offset must be a multiple of 1024
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*/
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/* The maximum allowed size for any memory region */
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#define IPA_MEM_MAX (2 * PAGE_SIZE)
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/* IPA-resident memory region ids */
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enum ipa_mem_id {
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IPA_MEM_UC_SHARED, /* 0 canaries */
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IPA_MEM_UC_INFO, /* 0 canaries */
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IPA_MEM_V4_FILTER_HASHED, /* 2 canaries */
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IPA_MEM_V4_FILTER, /* 2 canaries */
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IPA_MEM_V6_FILTER_HASHED, /* 2 canaries */
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IPA_MEM_V6_FILTER, /* 2 canaries */
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IPA_MEM_V4_ROUTE_HASHED, /* 2 canaries */
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IPA_MEM_V4_ROUTE, /* 2 canaries */
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IPA_MEM_V6_ROUTE_HASHED, /* 2 canaries */
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IPA_MEM_V6_ROUTE, /* 2 canaries */
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IPA_MEM_MODEM_HEADER, /* 2 canaries */
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IPA_MEM_AP_HEADER, /* 0 canaries, optional */
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IPA_MEM_MODEM_PROC_CTX, /* 2 canaries */
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IPA_MEM_AP_PROC_CTX, /* 0 canaries */
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IPA_MEM_MODEM, /* 0/2 canaries */
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IPA_MEM_UC_EVENT_RING, /* 1 canary, optional */
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IPA_MEM_PDN_CONFIG, /* 0/2 canaries (IPA v4.0+) */
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IPA_MEM_STATS_QUOTA_MODEM, /* 2/4 canaries (IPA v4.0+) */
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IPA_MEM_STATS_QUOTA_AP, /* 0 canaries, optional (IPA v4.0+) */
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IPA_MEM_STATS_TETHERING, /* 0 canaries (IPA v4.0+) */
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IPA_MEM_STATS_DROP, /* 0 canaries, optional (IPA v4.0+) */
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/* The next 5 filter and route statistics regions are optional */
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IPA_MEM_STATS_V4_FILTER, /* 0 canaries (IPA v4.0-v4.2) */
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IPA_MEM_STATS_V6_FILTER, /* 0 canaries (IPA v4.0-v4.2) */
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IPA_MEM_STATS_V4_ROUTE, /* 0 canaries (IPA v4.0-v4.2) */
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IPA_MEM_STATS_V6_ROUTE, /* 0 canaries (IPA v4.0-v4.2) */
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IPA_MEM_STATS_FILTER_ROUTE, /* 0 canaries (IPA v4.5+) */
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IPA_MEM_NAT_TABLE, /* 4 canaries, optional (IPA v4.5+) */
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IPA_MEM_END_MARKER, /* 1 canary (not a real region) */
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IPA_MEM_COUNT, /* Number of regions (not an index) */
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};
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/**
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* struct ipa_mem - IPA local memory region description
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* @id: memory region identifier
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* @offset: offset in IPA memory space to base of the region
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* @size: size in bytes base of the region
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* @canary_count: Number of 32-bit "canary" values that precede region
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*/
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struct ipa_mem {
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enum ipa_mem_id id;
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u32 offset;
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u16 size;
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u16 canary_count;
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};
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const struct ipa_mem *ipa_mem_find(struct ipa *ipa, enum ipa_mem_id mem_id);
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int ipa_mem_config(struct ipa *ipa);
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void ipa_mem_deconfig(struct ipa *ipa);
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int ipa_mem_setup(struct ipa *ipa); /* No ipa_mem_teardown() needed */
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int ipa_mem_zero_modem(struct ipa *ipa);
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int ipa_mem_init(struct ipa *ipa, const struct ipa_mem_data *mem_data);
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void ipa_mem_exit(struct ipa *ipa);
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#endif /* _IPA_MEM_H_ */
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