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Date: Wed, 29 May 2024 15:43:17 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>
Cc: srinivas.kandagatla@...aro.org, linux-arm-msm@...r.kernel.org,
gregkh@...uxfoundation.org, quic_bkumar@...cinc.com, linux-kernel@...r.kernel.org,
quic_chennak@...cinc.com
Subject: Re: [PATCH v2 4/8] misc: fastrpc: Add static PD restart support
On Wed, May 29, 2024 at 04:41:51PM +0530, Ekansh Gupta wrote:
>
> On 5/28/2024 6:03 PM, Dmitry Baryshkov wrote:
> > On Tue, May 28, 2024 at 04:59:50PM +0530, Ekansh Gupta wrote:
> > > Static PDs on the audio and sensor domains are expected to support
> > > PD restart. The kernel resource handling for the PDs are expected
> > > to be handled by fastrpc driver. For this, there is a requirement
> > > of PD service locator to get the event notifications for static PD
> > > services. Also when events are received, the driver needs to handle
> > > based on PD states. Added changes to add service locator for audio
> > > and sensor domain static PDs and handle the PD restart sequence.
> > >
> > > Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
> > > ---
> > > drivers/misc/Kconfig | 2 +
> > > drivers/misc/fastrpc.c | 205 ++++++++++++++++++++++++++++++++++++++---
> > > 2 files changed, 195 insertions(+), 12 deletions(-)
> > >
> > > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> > > index faf983680040..e2d83cd085b5 100644
> > > --- a/drivers/misc/Kconfig
> > > +++ b/drivers/misc/Kconfig
> > > @@ -280,8 +280,10 @@ config QCOM_FASTRPC
> > > tristate "Qualcomm FastRPC"
> > > depends on ARCH_QCOM || COMPILE_TEST
> > > depends on RPMSG
> > > + depends on NET
> > > select DMA_SHARED_BUFFER
> > > select QCOM_SCM
> > > + select QCOM_PDR_HELPERS
> > > help
> > > Provides a communication mechanism that allows for clients to
> > > make remote method invocations across processor boundary to
> > > diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> > > index 6556c63c4ad7..7796b743cc45 100644
> > > --- a/drivers/misc/fastrpc.c
> > > +++ b/drivers/misc/fastrpc.c
> > > @@ -22,6 +22,7 @@
> > > #include <linux/firmware/qcom/qcom_scm.h>
> > > #include <uapi/misc/fastrpc.h>
> > > #include <linux/of_reserved_mem.h>
> > > +#include <linux/soc/qcom/pdr.h>
> > > #define ADSP_DOMAIN_ID (0)
> > > #define MDSP_DOMAIN_ID (1)
> > > @@ -29,6 +30,7 @@
> > > #define CDSP_DOMAIN_ID (3)
> > > #define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/
> > > #define FASTRPC_MAX_SESSIONS 14
> > > +#define FASTRPC_MAX_SPD 4
> > > #define FASTRPC_MAX_VMIDS 16
> > > #define FASTRPC_ALIGN 128
> > > #define FASTRPC_MAX_FDLIST 16
> > > @@ -105,6 +107,18 @@
> > > #define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscdev)
> > > +#define AUDIO_PDR_SERVICE_LOCATION_CLIENT_NAME "audio_pdr_adsp"
> > > +#define AUDIO_PDR_ADSP_SERVICE_NAME "avs/audio"
> > > +#define ADSP_AUDIOPD_NAME "msm/adsp/audio_pd"
> > > +
> > > +#define SENSORS_PDR_ADSP_SERVICE_LOCATION_CLIENT_NAME "sensors_pdr_adsp"
> > > +#define SENSORS_PDR_ADSP_SERVICE_NAME "tms/servreg"
> > > +#define ADSP_SENSORPD_NAME "msm/adsp/sensor_pd"
> > > +
> > > +#define SENSORS_PDR_SLPI_SERVICE_LOCATION_CLIENT_NAME "sensors_pdr_slpi"
> > > +#define SENSORS_PDR_SLPI_SERVICE_NAME SENSORS_PDR_ADSP_SERVICE_NAME
> > > +#define SLPI_SENSORPD_NAME "msm/slpi/sensor_pd"
> > > +
> > > static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
> > > "sdsp", "cdsp"};
> > > struct fastrpc_phy_page {
> > > @@ -258,6 +272,15 @@ struct fastrpc_session_ctx {
> > > bool valid;
> > > };
> > > +struct fastrpc_static_pd {
> > > + char *servloc_name;
> > > + char *spdname;
> > > + void *pdrhandle;
> > > + struct fastrpc_channel_ctx *cctx;
> > > + struct fastrpc_user *fl;
> > > + bool ispdup;
> > > +};
> > > +
> > > struct fastrpc_channel_ctx {
> > > int domain_id;
> > > int sesscount;
> > > @@ -265,6 +288,7 @@ struct fastrpc_channel_ctx {
> > > struct qcom_scm_vmperm vmperms[FASTRPC_MAX_VMIDS];
> > > struct rpmsg_device *rpdev;
> > > struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
> > > + struct fastrpc_static_pd spd[FASTRPC_MAX_SPD];
> > > spinlock_t lock;
> > > struct idr ctx_idr;
> > > struct list_head users;
> > > @@ -296,10 +320,12 @@ struct fastrpc_user {
> > > struct fastrpc_channel_ctx *cctx;
> > > struct fastrpc_session_ctx *sctx;
> > > struct fastrpc_buf *init_mem;
> > > + struct fastrpc_static_pd *spd;
> > > int tgid;
> > > int pd;
> > > bool is_secure_dev;
> > > + char *servloc_name;
> > > /* Lock for lists */
> > > spinlock_t lock;
> > > /* lock for allocations */
> > > @@ -1257,12 +1283,33 @@ static bool is_session_rejected(struct fastrpc_user *fl, bool unsigned_pd_reques
> > > return false;
> > > }
> > > +static struct fastrpc_static_pd *fastrpc_get_spd_session(
> > > + struct fastrpc_user *fl)
> > > +{
> > > + int i;
> > > + struct fastrpc_static_pd *spd = NULL;
> > > + struct fastrpc_channel_ctx *cctx = fl->cctx;
> > > +
> > > + for (i = 0; i < FASTRPC_MAX_SPD ; i++) {
> > > + if (!cctx->spd[i].servloc_name)
> > > + continue;
> > > + if (!strcmp(fl->servloc_name, cctx->spd[i].servloc_name)) {
> > > + spd = &cctx->spd[i];
> > > + spd->fl = fl;
> > > + break;
> > > + }
> > > + }
> > > +
> > > + return spd;
> > > +}
> > > +
> > > static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
> > > char __user *argp)
> > > {
> > > struct fastrpc_init_create_static init;
> > > struct fastrpc_invoke_args *args;
> > > struct fastrpc_phy_page pages[1];
> > > + struct fastrpc_static_pd *spd = NULL;
> > > char *name;
> > > int err;
> > > struct {
> > > @@ -1297,6 +1344,19 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
> > > goto err_name;
> > > }
> > > + fl->servloc_name = AUDIO_PDR_SERVICE_LOCATION_CLIENT_NAME;
> > Why are the audio and sensors sessions handled at different places?
> > What about the MDSP or CDSP restarts?
>
> Thanks for reviewing the patches, Dmitry. The remote methods for audio and
> sensors PD attach are different and that is why both are handled in
> different places.
In which way are they different?
> As for MDSP and CDSP, no static PDs are supported, hence,
Should we still notify userspace if we get a PDR message for
msm/cdsp/root_pd? Or for msm/modem/root_pd?
> there is no requirement to handle static PD restarts there. Please let me
> know if you have any other queries. --Ekansh
>
> >
> > > +
> > > + spd = fastrpc_get_spd_session(fl);
> > > + if (!spd) {
> > > + err = -EUSERS;
> > > + goto err_name;
> > > + }
> > > +
> > > + if (!spd->ispdup) {
> > > + err = -ENOTCONN;
> > > + goto err_name;
> > > + }
> > > + fl->spd = spd;
> > > if (!fl->cctx->remote_heap) {
> > > err = fastrpc_remote_heap_alloc(fl, fl->sctx->dev, init.memlen,
> > > &fl->cctx->remote_heap);
> > > @@ -1688,6 +1748,7 @@ static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
> > > static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
> > > {
> > > struct fastrpc_invoke_args args[1];
> > > + struct fastrpc_static_pd *spd = NULL;
> > > int tgid = fl->tgid;
> > > u32 sc;
> > > @@ -1697,6 +1758,22 @@ static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
> > > sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
> > > fl->pd = pd;
> > > + if (pd == SENSORS_PD) {
> > > + if (fl->cctx->domain_id == ADSP_DOMAIN_ID)
> > > + fl->servloc_name = SENSORS_PDR_ADSP_SERVICE_LOCATION_CLIENT_NAME;
> > > + else if (fl->cctx->domain_id == SDSP_DOMAIN_ID)
> > > + fl->servloc_name = SENSORS_PDR_SLPI_SERVICE_LOCATION_CLIENT_NAME;
> > > +
> > > + spd = fastrpc_get_spd_session(fl);
> > > + if (!spd)
> > > + return -EUSERS;
> > > +
> > > + if (!spd->ispdup)
> > > + return -ENOTCONN;
> > > +
> > > + fl->spd = spd;
> > > + }
> > > +
> > > return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
> > > sc, &args[0]);
> > > }
> > > @@ -2172,6 +2249,64 @@ static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
> > > return err;
> > > }
> > > +static void fastrpc_notify_users(struct fastrpc_user *user)
> > > +{
> > > + struct fastrpc_invoke_ctx *ctx;
> > > +
> > > + spin_lock(&user->lock);
> > > + list_for_each_entry(ctx, &user->pending, node) {
> > > + ctx->retval = -EPIPE;
> > > + complete(&ctx->work);
> > > + }
> > > + spin_unlock(&user->lock);
> > > +}
> > > +
> > > +static void fastrpc_notify_pdr_drivers(struct fastrpc_channel_ctx *cctx,
> > > + char *servloc_name)
> > > +{
> > > + struct fastrpc_user *fl;
> > > + unsigned long flags;
> > > +
> > > + spin_lock_irqsave(&cctx->lock, flags);
> > > + list_for_each_entry(fl, &cctx->users, user) {
> > > + if (fl->servloc_name && !strcmp(servloc_name, fl->servloc_name))
> > > + fastrpc_notify_users(fl);
> > > + }
> > > + spin_unlock_irqrestore(&cctx->lock, flags);
> > > +}
> > > +
> > > +static void fastrpc_pdr_cb(int state, char *service_path, void *priv)
> > > +{
> > > + struct fastrpc_static_pd *spd = (struct fastrpc_static_pd *)priv;
> > > + struct fastrpc_channel_ctx *cctx;
> > > +
> > > + if (!spd)
> > > + return;
> > > +
> > > + cctx = spd->cctx;
> > > + switch (state) {
> > > + case SERVREG_SERVICE_STATE_DOWN:
> > > + dev_info(&cctx->rpdev->dev,
> > > + "%s: %s (%s) is down for PDR on %s\n",
> > > + __func__, spd->spdname,
> > > + spd->servloc_name,
> > > + domains[cctx->domain_id]);
> > > + spd->ispdup = false;
> > > + fastrpc_notify_pdr_drivers(cctx, spd->servloc_name);
> > > + break;
> > > + case SERVREG_SERVICE_STATE_UP:
> > > + dev_info(&cctx->rpdev->dev,
> > > + "%s: %s (%s) is up for PDR on %s\n",
> > > + __func__, spd->spdname,
> > > + spd->servloc_name,
> > > + domains[cctx->domain_id]);
> > > + spd->ispdup = true;
> > > + break;
> > > + default:
> > > + break;
> > > + }
> > > +}
> > > +
> > > static const struct file_operations fastrpc_fops = {
> > > .open = fastrpc_device_open,
> > > .release = fastrpc_device_release,
> > > @@ -2291,6 +2426,39 @@ static int fastrpc_device_register(struct device *dev, struct fastrpc_channel_ct
> > > return err;
> > > }
> > > +static int fastrpc_setup_service_locator(struct fastrpc_channel_ctx *cctx, char *client_name,
> > > + char *service_name, char *service_path, int domain, int spd_session)
> > > +{
> > > + int err = 0;
> > > + struct pdr_handle *handle = NULL;
> > > + struct pdr_service *service = NULL;
> > > +
> > > + /* Register the service locator's callback function */
> > > + handle = pdr_handle_alloc(fastrpc_pdr_cb, &cctx->spd[spd_session]);
> > > + if (IS_ERR(handle)) {
> > > + err = PTR_ERR(handle);
> > > + goto bail;
> > > + }
> > > + cctx->spd[spd_session].pdrhandle = handle;
> > > + cctx->spd[spd_session].servloc_name = client_name;
> > > + cctx->spd[spd_session].spdname = service_path;
> > > + cctx->spd[spd_session].cctx = cctx;
> > > + service = pdr_add_lookup(handle, service_name, service_path);
> > > + if (IS_ERR(service)) {
> > > + err = PTR_ERR(service);
> > > + goto bail;
> > > + }
> > > + pr_info("fastrpc: %s: pdr_add_lookup enabled for %s (%s, %s)\n",
> > > + __func__, service_name, client_name, service_path);
> > > +
> > > +bail:
> > > + if (err) {
> > > + pr_warn("fastrpc: %s: failed for %s (%s, %s)with err %d\n",
> > > + __func__, service_name, client_name, service_path, err);
> > > + }
> > > + return err;
> > > +}
> > > +
> > > static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
> > > {
> > > struct device *rdev = &rpdev->dev;
> > > @@ -2369,6 +2537,25 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
> > > goto fdev_error;
> > > }
> > > + if (domain_id == ADSP_DOMAIN_ID) {
> > > + err = fastrpc_setup_service_locator(data, AUDIO_PDR_SERVICE_LOCATION_CLIENT_NAME,
> > > + AUDIO_PDR_ADSP_SERVICE_NAME, ADSP_AUDIOPD_NAME, domain_id, 0);
> > > + if (err)
> > > + goto populate_error;
> > > +
> > > + err = fastrpc_setup_service_locator(data,
> > > + SENSORS_PDR_ADSP_SERVICE_LOCATION_CLIENT_NAME,
> > > + SENSORS_PDR_ADSP_SERVICE_NAME, ADSP_SENSORPD_NAME, domain_id, 1);
> > > + if (err)
> > > + goto populate_error;
> > > + } else if (domain_id == SDSP_DOMAIN_ID) {
> > > + err = fastrpc_setup_service_locator(data,
> > > + SENSORS_PDR_SLPI_SERVICE_LOCATION_CLIENT_NAME,
> > > + SENSORS_PDR_SLPI_SERVICE_NAME, SLPI_SENSORPD_NAME, domain_id, 0);
> > > + if (err)
> > > + goto populate_error;
> > > + }
> > > +
> > > kref_init(&data->refcount);
> > > dev_set_drvdata(&rpdev->dev, data);
> > > @@ -2397,23 +2584,12 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
> > > return err;
> > > }
> > > -static void fastrpc_notify_users(struct fastrpc_user *user)
> > > -{
> > > - struct fastrpc_invoke_ctx *ctx;
> > > -
> > > - spin_lock(&user->lock);
> > > - list_for_each_entry(ctx, &user->pending, node) {
> > > - ctx->retval = -EPIPE;
> > > - complete(&ctx->work);
> > > - }
> > > - spin_unlock(&user->lock);
> > > -}
> > > -
> > > static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
> > > {
> > > struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
> > > struct fastrpc_user *user;
> > > unsigned long flags;
> > > + int i;
> > > /* No invocations past this point */
> > > spin_lock_irqsave(&cctx->lock, flags);
> > > @@ -2431,6 +2607,11 @@ static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
> > > if (cctx->remote_heap)
> > > fastrpc_buf_free(cctx->remote_heap);
> > > + for (i = 0; i < FASTRPC_MAX_SPD; i++) {
> > > + if (cctx->spd[i].pdrhandle)
> > > + pdr_handle_release(cctx->spd[i].pdrhandle);
> > > + }
> > > +
> > > of_platform_depopulate(&rpdev->dev);
> > > fastrpc_channel_ctx_put(cctx);
> > > --
> > > 2.43.0
> > >
--
With best wishes
Dmitry
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