diff options
Diffstat (limited to 'drivers/net/ipa/ipa_table.c')
| -rw-r--r-- | drivers/net/ipa/ipa_table.c | 117 |
1 files changed, 49 insertions, 68 deletions
diff --git a/drivers/net/ipa/ipa_table.c b/drivers/net/ipa/ipa_table.c index baaab3dd0e63..3168d72f4245 100644 --- a/drivers/net/ipa/ipa_table.c +++ b/drivers/net/ipa/ipa_table.c @@ -27,28 +27,38 @@ /** * DOC: IPA Filter and Route Tables * - * The IPA has tables defined in its local shared memory that define filter - * and routing rules. Each entry in these tables contains a 64-bit DMA - * address that refers to DRAM (system memory) containing a rule definition. + * The IPA has tables defined in its local (IPA-resident) memory that define + * filter and routing rules. An entry in either of these tables is a little + * endian 64-bit "slot" that holds the address of a rule definition. (The + * size of these slots is 64 bits regardless of the host DMA address size.) + * + * Separate tables (both filter and route) used for IPv4 and IPv6. There + * are normally another set of "hashed" filter and route tables, which are + * used with a hash of message metadata. Hashed operation is not supported + * by all IPA hardware (IPA v4.2 doesn't support hashed tables). + * + * Rules can be in local memory or in DRAM (system memory). The offset of + * an object (such as a route or filter table) in IPA-resident memory must + * 128-byte aligned. An object in system memory (such as a route or filter + * rule) must be at an 8-byte aligned address. We currently only place + * route or filter rules in system memory. + * * A rule consists of a contiguous block of 32-bit values terminated with * 32 zero bits. A special "zero entry" rule consisting of 64 zero bits * represents "no filtering" or "no routing," and is the reset value for - * filter or route table rules. Separate tables (both filter and route) - * used for IPv4 and IPv6. Additionally, there can be hashed filter or - * route tables, which are used when a hash of message metadata matches. - * Hashed operation is not supported by all IPA hardware. + * filter or route table rules. * * Each filter rule is associated with an AP or modem TX endpoint, though - * not all TX endpoints support filtering. The first 64-bit entry in a + * not all TX endpoints support filtering. The first 64-bit slot in a * filter table is a bitmap indicating which endpoints have entries in * the table. The low-order bit (bit 0) in this bitmap represents a * special global filter, which applies to all traffic. This is not * used in the current code. Bit 1, if set, indicates that there is an - * entry (i.e. a DMA address referring to a rule) for endpoint 0 in the - * table. Bit 2, if set, indicates there is an entry for endpoint 1, - * and so on. Space is set aside in IPA local memory to hold as many - * filter table entries as might be required, but typically they are not - * all used. + * entry (i.e. slot containing a system address referring to a rule) for + * endpoint 0 in the table. Bit 3, if set, indicates there is an entry + * for endpoint 2, and so on. Space is set aside in IPA local memory to + * hold as many filter table entries as might be required, but typically + * they are not all used. * * The AP initializes all entries in a filter table to refer to a "zero" * entry. Once initialized the modem and AP update the entries for @@ -96,9 +106,6 @@ * ---------------------- */ -/* IPA hardware constrains filter and route tables alignment */ -#define IPA_TABLE_ALIGN 128 /* Minimum table alignment */ - /* Assignment of route table entries to the modem and AP */ #define IPA_ROUTE_MODEM_MIN 0 #define IPA_ROUTE_MODEM_COUNT 8 @@ -118,21 +125,14 @@ /* Check things that can be validated at build time. */ static void ipa_table_validate_build(void) { - /* IPA hardware accesses memory 128 bytes at a time. Addresses - * referred to by entries in filter and route tables must be - * aligned on 128-byte byte boundaries. The only rule address - * ever use is the "zero rule", and it's aligned at the base - * of a coherent DMA allocation. - */ - BUILD_BUG_ON(ARCH_DMA_MINALIGN % IPA_TABLE_ALIGN); - - /* Filter and route tables contain DMA addresses that refer to - * filter or route rules. We use a fixed constant to represent - * the size of either type of table entry. Code in ipa_table_init() - * uses a pointer to __le64 to initialize table entriews. + /* Filter and route tables contain DMA addresses that refer + * to filter or route rules. But the size of a table entry + * is 64 bits regardless of what the size of an AP DMA address + * is. A fixed constant defines the size of an entry, and + * code in ipa_table_init() uses a pointer to __le64 to + * initialize tables. */ - BUILD_BUG_ON(IPA_TABLE_ENTRY_SIZE != sizeof(dma_addr_t)); - BUILD_BUG_ON(sizeof(dma_addr_t) != sizeof(__le64)); + BUILD_BUG_ON(sizeof(dma_addr_t) > sizeof(__le64)); /* A "zero rule" is used to represent no filtering or no routing. * It is a 64-bit block of zeroed memory. Code in ipa_table_init() @@ -163,7 +163,7 @@ ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed) else mem = hashed ? &ipa->mem[IPA_MEM_V4_ROUTE_HASHED] : &ipa->mem[IPA_MEM_V4_ROUTE]; - size = IPA_ROUTE_COUNT_MAX * IPA_TABLE_ENTRY_SIZE; + size = IPA_ROUTE_COUNT_MAX * sizeof(__le64); } else { if (ipv6) mem = hashed ? &ipa->mem[IPA_MEM_V6_FILTER_HASHED] @@ -171,7 +171,7 @@ ipa_table_valid_one(struct ipa *ipa, bool route, bool ipv6, bool hashed) else mem = hashed ? &ipa->mem[IPA_MEM_V4_FILTER_HASHED] : &ipa->mem[IPA_MEM_V4_FILTER]; - size = (1 + IPA_FILTER_COUNT_MAX) * IPA_TABLE_ENTRY_SIZE; + size = (1 + IPA_FILTER_COUNT_MAX) * sizeof(__le64); } if (!ipa_cmd_table_valid(ipa, mem, route, ipv6, hashed)) @@ -239,11 +239,6 @@ static void ipa_table_validate_build(void) #endif /* !IPA_VALIDATE */ -bool ipa_table_hash_support(struct ipa *ipa) -{ - return ipa->version != IPA_VERSION_4_2; -} - /* Zero entry count means no table, so just return a 0 address */ static dma_addr_t ipa_table_addr(struct ipa *ipa, bool filter_mask, u16 count) { @@ -275,8 +270,8 @@ static void ipa_table_reset_add(struct gsi_trans *trans, bool filter, if (filter) first++; /* skip over bitmap */ - offset = mem->offset + first * IPA_TABLE_ENTRY_SIZE; - size = count * IPA_TABLE_ENTRY_SIZE; + offset = mem->offset + first * sizeof(__le64); + size = count * sizeof(__le64); addr = ipa_table_addr(ipa, false, count); ipa_cmd_dma_shared_mem_add(trans, offset, size, addr, true); @@ -458,11 +453,11 @@ static void ipa_table_init_add(struct gsi_trans *trans, bool filter, count = hweight32(ipa->filter_map); hash_count = hash_mem->size ? count : 0; } else { - count = mem->size / IPA_TABLE_ENTRY_SIZE; - hash_count = hash_mem->size / IPA_TABLE_ENTRY_SIZE; + count = mem->size / sizeof(__le64); + hash_count = hash_mem->size / sizeof(__le64); } - size = count * IPA_TABLE_ENTRY_SIZE; - hash_size = hash_count * IPA_TABLE_ENTRY_SIZE; + size = count * sizeof(__le64); + hash_size = hash_count * sizeof(__le64); addr = ipa_table_addr(ipa, filter, count); hash_addr = ipa_table_addr(ipa, filter, hash_count); @@ -502,11 +497,6 @@ int ipa_table_setup(struct ipa *ipa) return 0; } -void ipa_table_teardown(struct ipa *ipa) -{ - /* Nothing to do */ /* XXX Maybe reset the tables? */ -} - /** * ipa_filter_tuple_zero() - Zero an endpoint's hashed filter tuple * @endpoint: Endpoint whose filter hash tuple should be zeroed @@ -530,6 +520,7 @@ static void ipa_filter_tuple_zero(struct ipa_endpoint *endpoint) iowrite32(val, endpoint->ipa->reg_virt + offset); } +/* Configure a hashed filter table; there is no ipa_filter_deconfig() */ static void ipa_filter_config(struct ipa *ipa, bool modem) { enum gsi_ee_id ee_id = modem ? GSI_EE_MODEM : GSI_EE_AP; @@ -550,11 +541,6 @@ static void ipa_filter_config(struct ipa *ipa, bool modem) } } -static void ipa_filter_deconfig(struct ipa *ipa, bool modem) -{ - /* Nothing to do */ -} - static bool ipa_route_id_modem(u32 route_id) { return route_id >= IPA_ROUTE_MODEM_MIN && @@ -581,6 +567,7 @@ static void ipa_route_tuple_zero(struct ipa *ipa, u32 route_id) iowrite32(val, ipa->reg_virt + offset); } +/* Configure a hashed route table; there is no ipa_route_deconfig() */ static void ipa_route_config(struct ipa *ipa, bool modem) { u32 route_id; @@ -593,11 +580,7 @@ static void ipa_route_config(struct ipa *ipa, bool modem) ipa_route_tuple_zero(ipa, route_id); } -static void ipa_route_deconfig(struct ipa *ipa, bool modem) -{ - /* Nothing to do */ -} - +/* Configure a filter and route tables; there is no ipa_table_deconfig() */ void ipa_table_config(struct ipa *ipa) { ipa_filter_config(ipa, false); @@ -606,14 +589,6 @@ void ipa_table_config(struct ipa *ipa) ipa_route_config(ipa, true); } -void ipa_table_deconfig(struct ipa *ipa) -{ - ipa_route_deconfig(ipa, true); - ipa_route_deconfig(ipa, false); - ipa_filter_deconfig(ipa, true); - ipa_filter_deconfig(ipa, false); -} - /* * Initialize a coherent DMA allocation containing initialized filter and * route table data. This is used when initializing or resetting the IPA @@ -663,7 +638,13 @@ int ipa_table_init(struct ipa *ipa) ipa_table_validate_build(); - size = IPA_ZERO_RULE_SIZE + (1 + count) * IPA_TABLE_ENTRY_SIZE; + /* The IPA hardware requires route and filter table rules to be + * aligned on a 128-byte boundary. We put the "zero rule" at the + * base of the table area allocated here. The DMA address returned + * by dma_alloc_coherent() is guaranteed to be a power-of-2 number + * of pages, which satisfies the rule alignment requirement. + */ + size = IPA_ZERO_RULE_SIZE + (1 + count) * sizeof(__le64); virt = dma_alloc_coherent(dev, size, &addr, GFP_KERNEL); if (!virt) return -ENOMEM; @@ -695,7 +676,7 @@ void ipa_table_exit(struct ipa *ipa) struct device *dev = &ipa->pdev->dev; size_t size; - size = IPA_ZERO_RULE_SIZE + (1 + count) * IPA_TABLE_ENTRY_SIZE; + size = IPA_ZERO_RULE_SIZE + (1 + count) * sizeof(__le64); dma_free_coherent(dev, size, ipa->table_virt, ipa->table_addr); ipa->table_addr = 0; |