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scsi: mpt3sas: Introduce Base function for cloning. 

All scsi IO's and config request's data buffer and sgl are cloned to
system memory in _clone_sg_entries before submitting it to firmware.

Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Suganath Prabu Subramani 2018-02-07 02:51:48 -08:00 committed by Martin K. Petersen
parent 22ae5a3c25
commit 182ac784b4
3 changed files with 218 additions and 1 deletions
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215
drivers/scsi/mpt3sas/mpt3sas_base.c
View File

@ -125,6 +125,24 @@ _scsih_set_fwfault_debug(const char *val, const struct kernel_param *kp)
module_param_call(mpt3sas_fwfault_debug, _scsih_set_fwfault_debug,
param_get_int, &mpt3sas_fwfault_debug, 0644);
/**
* _base_clone_to_sys_mem - Writes/copies data to system/BAR0 region
*
* @dst_iomem: Pointer to the destination location in BAR0 space.
* @src: Pointer to the Source data.
* @size: Size of data to be copied.
*/
static void
_base_clone_to_sys_mem(void __iomem *dst_iomem, void *src, u32 size)
{
int i;
u32 *src_virt_mem = (u32 *)(src);
for (i = 0; i < size/4; i++)
writel((u32)src_virt_mem[i],
(void __iomem *)dst_iomem + (i * 4));
}
/**
* _base_get_chain - Calculates and Returns virtual chain address
* for the provided smid in BAR0 space.
@ -218,6 +236,201 @@ _base_get_buffer_phys_bar0(struct MPT3SAS_ADAPTER *ioc, u16 smid)
return chain_end_phys + (smid * 64 * 1024);
}
/**
* _base_get_chain_buffer_dma_to_chain_buffer - Iterates chain
* lookup list and Provides chain_buffer
* address for the matching dma address.
* (Each smid can have 64K starts from 17024)
*
* @ioc: per adapter object
* @chain_buffer_dma: Chain buffer dma address.
*
* @Returns - Pointer to chain buffer. Or Null on Failure.
*/
static void *
_base_get_chain_buffer_dma_to_chain_buffer(struct MPT3SAS_ADAPTER *ioc,
dma_addr_t chain_buffer_dma)
{
u16 index;
for (index = 0; index < ioc->chain_depth; index++) {
if (ioc->chain_lookup[index].chain_buffer_dma ==
chain_buffer_dma)
return ioc->chain_lookup[index].chain_buffer;
}
pr_info(MPT3SAS_FMT
"Provided chain_buffer_dma address is not in the lookup list\n",
ioc->name);
return NULL;
}
/**
* _clone_sg_entries - MPI EP's scsiio and config requests
* are handled here. Base function for
* double buffering, before submitting
* the requests.
*
* @ioc: per adapter object.
* @mpi_request: mf request pointer.
* @smid: system request message index.
*
* @Returns: Nothing.
*/
static void _clone_sg_entries(struct MPT3SAS_ADAPTER *ioc,
void *mpi_request, u16 smid)
{
Mpi2SGESimple32_t *sgel, *sgel_next;
u32 sgl_flags, sge_chain_count = 0;
bool is_write = 0;
u16 i = 0;
void __iomem *buffer_iomem;
void *buffer_iomem_phys;
void __iomem *buff_ptr;
void *buff_ptr_phys;
void __iomem *dst_chain_addr[MCPU_MAX_CHAINS_PER_IO];
void *src_chain_addr[MCPU_MAX_CHAINS_PER_IO], *dst_addr_phys;
MPI2RequestHeader_t *request_hdr;
struct scsi_cmnd *scmd;
struct scatterlist *sg_scmd = NULL;
int is_scsiio_req = 0;
request_hdr = (MPI2RequestHeader_t *) mpi_request;
if (request_hdr->Function == MPI2_FUNCTION_SCSI_IO_REQUEST) {
Mpi25SCSIIORequest_t *scsiio_request =
(Mpi25SCSIIORequest_t *)mpi_request;
sgel = (Mpi2SGESimple32_t *) &scsiio_request->SGL;
is_scsiio_req = 1;
} else if (request_hdr->Function == MPI2_FUNCTION_CONFIG) {
Mpi2ConfigRequest_t *config_req =
(Mpi2ConfigRequest_t *)mpi_request;
sgel = (Mpi2SGESimple32_t *) &config_req->PageBufferSGE;
} else
return;
/* From smid we can get scsi_cmd, once we have sg_scmd,
* we just need to get sg_virt and sg_next to get virual
* address associated with sgel->Address.
*/
if (is_scsiio_req) {
/* Get scsi_cmd using smid */
scmd = mpt3sas_scsih_scsi_lookup_get(ioc, smid);
if (scmd == NULL) {
pr_err(MPT3SAS_FMT "scmd is NULL\n", ioc->name);
return;
}
/* Get sg_scmd from scmd provided */
sg_scmd = scsi_sglist(scmd);
}
/*
* 0 - 255 System register
* 256 - 4352 MPI Frame. (This is based on maxCredit 32)
* 4352 - 4864 Reply_free pool (512 byte is reserved
* considering maxCredit 32. Reply need extra
* room, for mCPU case kept four times of
* maxCredit).
* 4864 - 17152 SGE chain element. (32cmd * 3 chain of
* 128 byte size = 12288)
* 17152 - x Host buffer mapped with smid.
* (Each smid can have 64K Max IO.)
* BAR0+Last 1K MSIX Addr and Data
* Total size in use 2113664 bytes of 4MB BAR0
*/
buffer_iomem = _base_get_buffer_bar0(ioc, smid);
buffer_iomem_phys = _base_get_buffer_phys_bar0(ioc, smid);
buff_ptr = buffer_iomem;
buff_ptr_phys = buffer_iomem_phys;
if (sgel->FlagsLength &
(MPI2_SGE_FLAGS_HOST_TO_IOC << MPI2_SGE_FLAGS_SHIFT))
is_write = 1;
for (i = 0; i < MPT_MIN_PHYS_SEGMENTS + ioc->facts.MaxChainDepth; i++) {
sgl_flags = (sgel->FlagsLength >> MPI2_SGE_FLAGS_SHIFT);
switch (sgl_flags & MPI2_SGE_FLAGS_ELEMENT_MASK) {
case MPI2_SGE_FLAGS_CHAIN_ELEMENT:
/*
* Helper function which on passing
* chain_buffer_dma returns chain_buffer. Get
* the virtual address for sgel->Address
*/
sgel_next =
_base_get_chain_buffer_dma_to_chain_buffer(ioc,
sgel->Address);
if (sgel_next == NULL)
return;
/*
* This is coping 128 byte chain
* frame (not a host buffer)
*/
dst_chain_addr[sge_chain_count] =
_base_get_chain(ioc,
smid, sge_chain_count);
src_chain_addr[sge_chain_count] =
(void *) sgel_next;
dst_addr_phys =
_base_get_chain_phys(ioc,
smid, sge_chain_count);
sgel->Address = (dma_addr_t)dst_addr_phys;
sgel = sgel_next;
sge_chain_count++;
break;
case MPI2_SGE_FLAGS_SIMPLE_ELEMENT:
if (is_write) {
if (is_scsiio_req) {
_base_clone_to_sys_mem(buff_ptr,
sg_virt(sg_scmd),
(sgel->FlagsLength & 0x00ffffff));
sgel->Address =
(dma_addr_t)buff_ptr_phys;
} else {
_base_clone_to_sys_mem(buff_ptr,
ioc->config_vaddr,
(sgel->FlagsLength & 0x00ffffff));
sgel->Address =
(dma_addr_t)buff_ptr_phys;
}
}
buff_ptr += (sgel->FlagsLength & 0x00ffffff);
buff_ptr_phys += (sgel->FlagsLength & 0x00ffffff);
if ((sgel->FlagsLength &
(MPI2_SGE_FLAGS_END_OF_BUFFER
<< MPI2_SGE_FLAGS_SHIFT)))
goto eob_clone_chain;
else {
/*
* Every single element in MPT will have
* associated sg_next. Better to sanity that
* sg_next is not NULL, but it will be a bug
* if it is null.
*/
if (is_scsiio_req) {
sg_scmd = sg_next(sg_scmd);
if (sg_scmd)
sgel++;
else
goto eob_clone_chain;
}
}
break;
}
}
eob_clone_chain:
for (i = 0; i < sge_chain_count; i++) {
if (is_scsiio_req)
_base_clone_to_sys_mem(dst_chain_addr[i],
src_chain_addr[i], ioc->request_sz);
}
}
/**
* mpt3sas_remove_dead_ioc_func - kthread context to remove dead ioc
* @arg: input argument, used to derive ioc
@ -3295,7 +3508,7 @@ _base_put_smid_nvme_encap_atomic(struct MPT3SAS_ADAPTER *ioc, u16 smid)
/**
* _base_put_smid_default - Default, primarily used for config pages
* use Atomic Request Descriptor
* use Atomic Request Descriptor
* @ioc: per adapter object
* @smid: system request message index
*

3
drivers/scsi/mpt3sas/mpt3sas_base.h
View File

@ -95,6 +95,8 @@
#define MPT_MIN_PHYS_SEGMENTS 16
#define MPT_KDUMP_MIN_PHYS_SEGMENTS 32
#define MCPU_MAX_CHAINS_PER_IO 3
#ifdef CONFIG_SCSI_MPT3SAS_MAX_SGE
#define MPT3SAS_SG_DEPTH CONFIG_SCSI_MPT3SAS_MAX_SGE
#else
@ -1238,6 +1240,7 @@ struct MPT3SAS_ADAPTER {
u16 config_page_sz;
void *config_page;
dma_addr_t config_page_dma;
void *config_vaddr;
/* scsiio request */
u16 hba_queue_depth;

1
drivers/scsi/mpt3sas/mpt3sas_config.c
View File

@ -219,6 +219,7 @@ _config_alloc_config_dma_memory(struct MPT3SAS_ADAPTER *ioc,
mem->page = ioc->config_page;
mem->page_dma = ioc->config_page_dma;
}
ioc->config_vaddr = mem->page;
return r;
}