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bus: mhi: ep: Pass mhi_ep_buf_info struct to read/write APIs

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In the preparation of DMA async support, let's pass the parameters to
read_from_host() and write_to_host() APIs using mhi_ep_buf_info structure.

No functional change.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Manivannan Sadhasivam 2023-08-17 23:24:52 +05:30
parent cea4bcbf99
commit b08ded2ef2
4 changed files with 84 additions and 62 deletions
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23
drivers/bus/mhi/ep/main.c
View File

@ -340,10 +340,9 @@ static int mhi_ep_read_channel(struct mhi_ep_cntrl *mhi_cntrl,
struct mhi_ep_chan *mhi_chan = &mhi_cntrl->mhi_chan[ring->ch_id];
struct device *dev = &mhi_cntrl->mhi_dev->dev;
size_t tr_len, read_offset, write_offset;
struct mhi_ep_buf_info buf_info = {};
struct mhi_ring_element *el;
bool tr_done = false;
void *write_addr;
u64 read_addr;
u32 buf_left;
int ret;
@ -372,11 +371,13 @@ static int mhi_ep_read_channel(struct mhi_ep_cntrl *mhi_cntrl,
read_offset = mhi_chan->tre_size - mhi_chan->tre_bytes_left;
write_offset = len - buf_left;
read_addr = mhi_chan->tre_loc + read_offset;
write_addr = result->buf_addr + write_offset;
buf_info.host_addr = mhi_chan->tre_loc + read_offset;
buf_info.dev_addr = result->buf_addr + write_offset;
buf_info.size = tr_len;
dev_dbg(dev, "Reading %zd bytes from channel (%u)\n", tr_len, ring->ch_id);
ret = mhi_cntrl->read_from_host(mhi_cntrl, read_addr, write_addr, tr_len);
ret = mhi_cntrl->read_from_host(mhi_cntrl, &buf_info);
if (ret < 0) {
dev_err(&mhi_chan->mhi_dev->dev, "Error reading from channel\n");
return ret;
@ -499,12 +500,11 @@ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb)
struct mhi_ep_cntrl *mhi_cntrl = mhi_dev->mhi_cntrl;
struct mhi_ep_chan *mhi_chan = mhi_dev->dl_chan;
struct device *dev = &mhi_chan->mhi_dev->dev;
struct mhi_ep_buf_info buf_info = {};
struct mhi_ring_element *el;
u32 buf_left, read_offset;
struct mhi_ep_ring *ring;
enum mhi_ev_ccs code;
void *read_addr;
u64 write_addr;
size_t tr_len;
u32 tre_len;
int ret;
@ -533,11 +533,13 @@ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb)
tr_len = min(buf_left, tre_len);
read_offset = skb->len - buf_left;
read_addr = skb->data + read_offset;
write_addr = MHI_TRE_DATA_GET_PTR(el);
buf_info.dev_addr = skb->data + read_offset;
buf_info.host_addr = MHI_TRE_DATA_GET_PTR(el);
buf_info.size = tr_len;
dev_dbg(dev, "Writing %zd bytes to channel (%u)\n", tr_len, ring->ch_id);
ret = mhi_cntrl->write_to_host(mhi_cntrl, read_addr, write_addr, tr_len);
ret = mhi_cntrl->write_to_host(mhi_cntrl, &buf_info);
if (ret < 0) {
dev_err(dev, "Error writing to the channel\n");
goto err_exit;
@ -1445,7 +1447,6 @@ int mhi_ep_register_controller(struct mhi_ep_cntrl *mhi_cntrl,
ret = -ENOMEM;
goto err_destroy_tre_buf_cache;
}
INIT_WORK(&mhi_cntrl->state_work, mhi_ep_state_worker);
INIT_WORK(&mhi_cntrl->reset_work, mhi_ep_reset_worker);
INIT_WORK(&mhi_cntrl->cmd_ring_work, mhi_ep_cmd_ring_worker);

41
drivers/bus/mhi/ep/ring.c
View File

@ -30,7 +30,8 @@ static int __mhi_ep_cache_ring(struct mhi_ep_ring *ring, size_t end)
{
struct mhi_ep_cntrl *mhi_cntrl = ring->mhi_cntrl;
struct device *dev = &mhi_cntrl->mhi_dev->dev;
size_t start, copy_size;
struct mhi_ep_buf_info buf_info = {};
size_t start;
int ret;
/* Don't proceed in the case of event ring. This happens during mhi_ep_ring_start(). */
@ -43,30 +44,34 @@ static int __mhi_ep_cache_ring(struct mhi_ep_ring *ring, size_t end)
start = ring->wr_offset;
if (start < end) {
copy_size = (end - start) * sizeof(struct mhi_ring_element);
ret = mhi_cntrl->read_from_host(mhi_cntrl, ring->rbase +
(start * sizeof(struct mhi_ring_element)),
&ring->ring_cache[start], copy_size);
buf_info.size = (end - start) * sizeof(struct mhi_ring_element);
buf_info.host_addr = ring->rbase + (start * sizeof(struct mhi_ring_element));
buf_info.dev_addr = &ring->ring_cache[start];
ret = mhi_cntrl->read_from_host(mhi_cntrl, &buf_info);
if (ret < 0)
return ret;
} else {
copy_size = (ring->ring_size - start) * sizeof(struct mhi_ring_element);
ret = mhi_cntrl->read_from_host(mhi_cntrl, ring->rbase +
(start * sizeof(struct mhi_ring_element)),
&ring->ring_cache[start], copy_size);
buf_info.size = (ring->ring_size - start) * sizeof(struct mhi_ring_element);
buf_info.host_addr = ring->rbase + (start * sizeof(struct mhi_ring_element));
buf_info.dev_addr = &ring->ring_cache[start];
ret = mhi_cntrl->read_from_host(mhi_cntrl, &buf_info);
if (ret < 0)
return ret;
if (end) {
ret = mhi_cntrl->read_from_host(mhi_cntrl, ring->rbase,
&ring->ring_cache[0],
end * sizeof(struct mhi_ring_element));
buf_info.host_addr = ring->rbase;
buf_info.dev_addr = &ring->ring_cache[0];
buf_info.size = end * sizeof(struct mhi_ring_element);
ret = mhi_cntrl->read_from_host(mhi_cntrl, &buf_info);
if (ret < 0)
return ret;
}
}
dev_dbg(dev, "Cached ring: start %zu end %zu size %zu\n", start, end, copy_size);
dev_dbg(dev, "Cached ring: start %zu end %zu size %zu\n", start, end, buf_info.size);
return 0;
}
@ -102,6 +107,7 @@ int mhi_ep_ring_add_element(struct mhi_ep_ring *ring, struct mhi_ring_element *e
{
struct mhi_ep_cntrl *mhi_cntrl = ring->mhi_cntrl;
struct device *dev = &mhi_cntrl->mhi_dev->dev;
struct mhi_ep_buf_info buf_info = {};
size_t old_offset = 0;
u32 num_free_elem;
__le64 rp;
@ -133,12 +139,11 @@ int mhi_ep_ring_add_element(struct mhi_ep_ring *ring, struct mhi_ring_element *e
rp = cpu_to_le64(ring->rd_offset * sizeof(*el) + ring->rbase);
memcpy_toio((void __iomem *) &ring->ring_ctx->generic.rp, &rp, sizeof(u64));
ret = mhi_cntrl->write_to_host(mhi_cntrl, el, ring->rbase + (old_offset * sizeof(*el)),
sizeof(*el));
if (ret < 0)
return ret;
buf_info.host_addr = ring->rbase + (old_offset * sizeof(*el));
buf_info.dev_addr = el;
buf_info.size = sizeof(*el);
return 0;
return mhi_cntrl->write_to_host(mhi_cntrl, &buf_info);
}
void mhi_ep_ring_init(struct mhi_ep_ring *ring, enum mhi_ep_ring_type type, u32 id)

66
drivers/pci/endpoint/functions/pci-epf-mhi.c
View File

@ -209,28 +209,28 @@ static void pci_epf_mhi_raise_irq(struct mhi_ep_cntrl *mhi_cntrl, u32 vector)
vector + 1);
}
static int pci_epf_mhi_iatu_read(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
void *to, size_t size)
static int pci_epf_mhi_iatu_read(struct mhi_ep_cntrl *mhi_cntrl,
struct mhi_ep_buf_info *buf_info)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
size_t offset = get_align_offset(epf_mhi, from);
size_t offset = get_align_offset(epf_mhi, buf_info->host_addr);
void __iomem *tre_buf;
phys_addr_t tre_phys;
int ret;
mutex_lock(&epf_mhi->lock);
ret = __pci_epf_mhi_alloc_map(mhi_cntrl, from, &tre_phys, &tre_buf,
offset, size);
ret = __pci_epf_mhi_alloc_map(mhi_cntrl, buf_info->host_addr, &tre_phys,
&tre_buf, offset, buf_info->size);
if (ret) {
mutex_unlock(&epf_mhi->lock);
return ret;
}
memcpy_fromio(to, tre_buf, size);
memcpy_fromio(buf_info->dev_addr, tre_buf, buf_info->size);
__pci_epf_mhi_unmap_free(mhi_cntrl, from, tre_phys, tre_buf, offset,
size);
__pci_epf_mhi_unmap_free(mhi_cntrl, buf_info->host_addr, tre_phys,
tre_buf, offset, buf_info->size);
mutex_unlock(&epf_mhi->lock);
@ -238,27 +238,27 @@ static int pci_epf_mhi_iatu_read(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
}
static int pci_epf_mhi_iatu_write(struct mhi_ep_cntrl *mhi_cntrl,
void *from, u64 to, size_t size)
struct mhi_ep_buf_info *buf_info)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
size_t offset = get_align_offset(epf_mhi, to);
size_t offset = get_align_offset(epf_mhi, buf_info->host_addr);
void __iomem *tre_buf;
phys_addr_t tre_phys;
int ret;
mutex_lock(&epf_mhi->lock);
ret = __pci_epf_mhi_alloc_map(mhi_cntrl, to, &tre_phys, &tre_buf,
offset, size);
ret = __pci_epf_mhi_alloc_map(mhi_cntrl, buf_info->host_addr, &tre_phys,
&tre_buf, offset, buf_info->size);
if (ret) {
mutex_unlock(&epf_mhi->lock);
return ret;
}
memcpy_toio(tre_buf, from, size);
memcpy_toio(tre_buf, buf_info->dev_addr, buf_info->size);
__pci_epf_mhi_unmap_free(mhi_cntrl, to, tre_phys, tre_buf, offset,
size);
__pci_epf_mhi_unmap_free(mhi_cntrl, buf_info->host_addr, tre_phys,
tre_buf, offset, buf_info->size);
mutex_unlock(&epf_mhi->lock);
@ -270,8 +270,8 @@ static void pci_epf_mhi_dma_callback(void *param)
complete(param);
}
static int pci_epf_mhi_edma_read(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
void *to, size_t size)
static int pci_epf_mhi_edma_read(struct mhi_ep_cntrl *mhi_cntrl,
struct mhi_ep_buf_info *buf_info)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
struct device *dma_dev = epf_mhi->epf->epc->dev.parent;
@ -284,13 +284,13 @@ static int pci_epf_mhi_edma_read(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
dma_addr_t dst_addr;
int ret;
if (size < SZ_4K)
return pci_epf_mhi_iatu_read(mhi_cntrl, from, to, size);
if (buf_info->size < SZ_4K)
return pci_epf_mhi_iatu_read(mhi_cntrl, buf_info);
mutex_lock(&epf_mhi->lock);
config.direction = DMA_DEV_TO_MEM;
config.src_addr = from;
config.src_addr = buf_info->host_addr;
ret = dmaengine_slave_config(chan, &config);
if (ret) {
@ -298,14 +298,16 @@ static int pci_epf_mhi_edma_read(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
goto err_unlock;
}
dst_addr = dma_map_single(dma_dev, to, size, DMA_FROM_DEVICE);
dst_addr = dma_map_single(dma_dev, buf_info->dev_addr, buf_info->size,
DMA_FROM_DEVICE);
ret = dma_mapping_error(dma_dev, dst_addr);
if (ret) {
dev_err(dev, "Failed to map remote memory\n");
goto err_unlock;
}
desc = dmaengine_prep_slave_single(chan, dst_addr, size, DMA_DEV_TO_MEM,
desc = dmaengine_prep_slave_single(chan, dst_addr, buf_info->size,
DMA_DEV_TO_MEM,
DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
if (!desc) {
dev_err(dev, "Failed to prepare DMA\n");
@ -332,15 +334,15 @@ static int pci_epf_mhi_edma_read(struct mhi_ep_cntrl *mhi_cntrl, u64 from,
}
err_unmap:
dma_unmap_single(dma_dev, dst_addr, size, DMA_FROM_DEVICE);
dma_unmap_single(dma_dev, dst_addr, buf_info->size, DMA_FROM_DEVICE);
err_unlock:
mutex_unlock(&epf_mhi->lock);
return ret;
}
static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl, void *from,
u64 to, size_t size)
static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl,
struct mhi_ep_buf_info *buf_info)
{
struct pci_epf_mhi *epf_mhi = to_epf_mhi(mhi_cntrl);
struct device *dma_dev = epf_mhi->epf->epc->dev.parent;
@ -353,13 +355,13 @@ static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl, void *from,
dma_addr_t src_addr;
int ret;
if (size < SZ_4K)
return pci_epf_mhi_iatu_write(mhi_cntrl, from, to, size);
if (buf_info->size < SZ_4K)
return pci_epf_mhi_iatu_write(mhi_cntrl, buf_info);
mutex_lock(&epf_mhi->lock);
config.direction = DMA_MEM_TO_DEV;
config.dst_addr = to;
config.dst_addr = buf_info->host_addr;
ret = dmaengine_slave_config(chan, &config);
if (ret) {
@ -367,14 +369,16 @@ static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl, void *from,
goto err_unlock;
}
src_addr = dma_map_single(dma_dev, from, size, DMA_TO_DEVICE);
src_addr = dma_map_single(dma_dev, buf_info->dev_addr, buf_info->size,
DMA_TO_DEVICE);
ret = dma_mapping_error(dma_dev, src_addr);
if (ret) {
dev_err(dev, "Failed to map remote memory\n");
goto err_unlock;
}
desc = dmaengine_prep_slave_single(chan, src_addr, size, DMA_MEM_TO_DEV,
desc = dmaengine_prep_slave_single(chan, src_addr, buf_info->size,
DMA_MEM_TO_DEV,
DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
if (!desc) {
dev_err(dev, "Failed to prepare DMA\n");
@ -401,7 +405,7 @@ static int pci_epf_mhi_edma_write(struct mhi_ep_cntrl *mhi_cntrl, void *from,
}
err_unmap:
dma_unmap_single(dma_dev, src_addr, size, DMA_FROM_DEVICE);
dma_unmap_single(dma_dev, src_addr, buf_info->size, DMA_FROM_DEVICE);
err_unlock:
mutex_unlock(&epf_mhi->lock);

16
include/linux/mhi_ep.h
View File

@ -49,6 +49,18 @@ struct mhi_ep_db_info {
u32 status;
};
/**
* struct mhi_ep_buf_info - MHI Endpoint transfer buffer info
* @dev_addr: Address of the buffer in endpoint
* @host_addr: Address of the bufffer in host
* @size: Size of the buffer
*/
struct mhi_ep_buf_info {
void *dev_addr;
u64 host_addr;
size_t size;
};
/**
* struct mhi_ep_cntrl - MHI Endpoint controller structure
* @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI
@ -137,8 +149,8 @@ struct mhi_ep_cntrl {
void __iomem **virt, size_t size);
void (*unmap_free)(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t phys,
void __iomem *virt, size_t size);
int (*read_from_host)(struct mhi_ep_cntrl *mhi_cntrl, u64 from, void *to, size_t size);
int (*write_to_host)(struct mhi_ep_cntrl *mhi_cntrl, void *from, u64 to, size_t size);
int (*read_from_host)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info);
int (*write_to_host)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info);
enum mhi_state mhi_state;