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powerpc/powernv/vas: Define vas_tx_win_open() 

Define an interface to open a VAS send window. This interface is
intended to be used the Nest Accelerator (NX) driver(s) to open
a send window and use it to submit compression/encryption requests
to a VAS receive window.

The receive window, identified by the [vasid, cop] parameters, must
already be open in VAS (i.e connected to an NX engine).

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu 2017-08-28 23:23:39 -07:00 committed by Michael Ellerman
parent 98271d4198
commit 5239af679a
2 changed files with 195 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
arch/powerpc/include/asm/vas.h
View File

@ -80,6 +80,29 @@ struct vas_rx_win_attr {
int tc_mode;
};
/*
* Window attributes specified by the in-kernel owner of a send window.
*/
struct vas_tx_win_attr {
enum vas_cop_type cop;
int wcreds_max;
int lpid;
int pidr; /* hardware PID (from SPRN_PID) */
int pid; /* linux process id */
int pswid;
int rsvd_txbuf_count;
int tc_mode;
bool user_win;
bool pin_win;
bool rej_no_credit;
bool rsvd_txbuf_enable;
bool tx_wcred_mode;
bool rx_wcred_mode;
bool tx_win_ord_mode;
bool rx_win_ord_mode;
};
/*
* Helper to initialize receive window attributes to defaults for an
* NX window.
@ -95,6 +118,25 @@ void vas_init_rx_win_attr(struct vas_rx_win_attr *rxattr, enum vas_cop_type cop)
struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop,
struct vas_rx_win_attr *attr);
/*
* Helper to initialize send window attributes to defaults for an NX window.
*/
extern void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr,
enum vas_cop_type cop);
/*
* Open a VAS send window for the instance of VAS identified by @vasid
* and the co-processor type @cop. Use @attr to initialize attributes
* of the window.
*
* Note: The instance of VAS must already have an open receive window for
* the coprocessor type @cop.
*
* Return a handle to the send window or ERR_PTR() on error.
*/
struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop,
struct vas_tx_win_attr *attr);
/*
* Close the send or receive window identified by @win. For receive windows
* return -EAGAIN if there are active send windows attached to this receive

156
arch/powerpc/platforms/powernv/vas-window.c
View File

@ -64,7 +64,7 @@ static inline void get_uwc_mmio_bar(struct vas_window *window,
* space. Unlike MMIO regions (map_mmio_region() below), paste region must
* be mapped cache-able and is only applicable to send windows.
*/
void *map_paste_region(struct vas_window *txwin)
static void *map_paste_region(struct vas_window *txwin)
{
int len;
void *map;
@ -100,7 +100,6 @@ free_name:
return ERR_PTR(-ENOMEM);
}
static void *map_mmio_region(char *name, u64 start, int len)
{
void *map;
@ -574,7 +573,7 @@ static void put_rx_win(struct vas_window *rxwin)
*
* See also function header of set_vinst_win().
*/
struct vas_window *get_vinst_rxwin(struct vas_instance *vinst,
static struct vas_window *get_vinst_rxwin(struct vas_instance *vinst,
enum vas_cop_type cop, u32 pswid)
{
struct vas_window *rxwin;
@ -847,6 +846,157 @@ struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop,
}
EXPORT_SYMBOL_GPL(vas_rx_win_open);
void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr, enum vas_cop_type cop)
{
memset(txattr, 0, sizeof(*txattr));
if (cop == VAS_COP_TYPE_842 || cop == VAS_COP_TYPE_842_HIPRI) {
txattr->rej_no_credit = false;
txattr->rx_wcred_mode = true;
txattr->tx_wcred_mode = true;
txattr->rx_win_ord_mode = true;
txattr->tx_win_ord_mode = true;
} else if (cop == VAS_COP_TYPE_FTW) {
txattr->user_win = true;
}
}
EXPORT_SYMBOL_GPL(vas_init_tx_win_attr);
static void init_winctx_for_txwin(struct vas_window *txwin,
struct vas_tx_win_attr *txattr,
struct vas_winctx *winctx)
{
/*
* We first zero all fields and only set non-zero ones. Following
* are some fields set to 0/false for the stated reason:
*
* ->notify_os_intr_reg In powernv, send intrs to HV
* ->rsvd_txbuf_count Not supported yet.
* ->notify_disable False for NX windows
* ->xtra_write False for NX windows
* ->notify_early NA for NX windows
* ->lnotify_lpid NA for Tx windows
* ->lnotify_pid NA for Tx windows
* ->lnotify_tid NA for Tx windows
* ->tx_win_cred_mode Ignore for now for NX windows
* ->rx_win_cred_mode Ignore for now for NX windows
*/
memset(winctx, 0, sizeof(struct vas_winctx));
winctx->wcreds_max = txattr->wcreds_max ?: VAS_WCREDS_DEFAULT;
winctx->user_win = txattr->user_win;
winctx->nx_win = txwin->rxwin->nx_win;
winctx->pin_win = txattr->pin_win;
winctx->rx_wcred_mode = txattr->rx_wcred_mode;
winctx->tx_wcred_mode = txattr->tx_wcred_mode;
winctx->rx_word_mode = txattr->rx_win_ord_mode;
winctx->tx_word_mode = txattr->tx_win_ord_mode;
if (winctx->nx_win) {
winctx->data_stamp = true;
winctx->intr_disable = true;
}
winctx->lpid = txattr->lpid;
winctx->pidr = txattr->pidr;
winctx->rx_win_id = txwin->rxwin->winid;
winctx->dma_type = VAS_DMA_TYPE_INJECT;
winctx->tc_mode = txattr->tc_mode;
winctx->min_scope = VAS_SCOPE_LOCAL;
winctx->max_scope = VAS_SCOPE_VECTORED_GROUP;
winctx->pswid = 0;
}
static bool tx_win_args_valid(enum vas_cop_type cop,
struct vas_tx_win_attr *attr)
{
if (attr->tc_mode != VAS_THRESH_DISABLED)
return false;
if (cop > VAS_COP_TYPE_MAX)
return false;
if (attr->user_win &&
(cop != VAS_COP_TYPE_FTW || attr->rsvd_txbuf_count))
return false;
return true;
}
struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop,
struct vas_tx_win_attr *attr)
{
int rc;
struct vas_window *txwin;
struct vas_window *rxwin;
struct vas_winctx winctx;
struct vas_instance *vinst;
if (!tx_win_args_valid(cop, attr))
return ERR_PTR(-EINVAL);
vinst = find_vas_instance(vasid);
if (!vinst) {
pr_devel("vasid %d not found!\n", vasid);
return ERR_PTR(-EINVAL);
}
rxwin = get_vinst_rxwin(vinst, cop, attr->pswid);
if (IS_ERR(rxwin)) {
pr_devel("No RxWin for vasid %d, cop %d\n", vasid, cop);
return rxwin;
}
txwin = vas_window_alloc(vinst);
if (IS_ERR(txwin)) {
rc = PTR_ERR(txwin);
goto put_rxwin;
}
txwin->tx_win = 1;
txwin->rxwin = rxwin;
txwin->nx_win = txwin->rxwin->nx_win;
txwin->pid = attr->pid;
txwin->user_win = attr->user_win;
init_winctx_for_txwin(txwin, attr, &winctx);
init_winctx_regs(txwin, &winctx);
/*
* If its a kernel send window, map the window address into the
* kernel's address space. For user windows, user must issue an
* mmap() to map the window into their address space.
*
* NOTE: If kernel ever resubmits a user CRB after handling a page
* fault, we will need to map this into kernel as well.
*/
if (!txwin->user_win) {
txwin->paste_kaddr = map_paste_region(txwin);
if (IS_ERR(txwin->paste_kaddr)) {
rc = PTR_ERR(txwin->paste_kaddr);
goto free_window;
}
}
set_vinst_win(vinst, txwin);
return txwin;
free_window:
vas_window_free(txwin);
put_rxwin:
put_rx_win(rxwin);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(vas_tx_win_open);
static void poll_window_busy_state(struct vas_window *window)
{
int busy;