kernel.git/drivers/net/ipa/gsi.h, branch linux-5.14.y

net: ipa: introduce gsi_ring_setup()

2021-06-21T19:30:59Z

Prior to IPA v3.5.1, there is no HW_PARAM_2 GSI register, which we use to determine the number of channels and endpoints per execution environment. In that case, we will just assume the number supported is the maximum supported by the driver. Introduce gsi_ring_setup() to encapsulate the code that determines the number of channels and endpoints. Update GSI_EVT_RING_COUNT_MAX so it is big enough to handle any available channel for all supported hardware (IPA v4.9 can have 23 channels and 24 event rings). Signed-off-by: Alex Elder Acked-by: AngeloGioacchino Del Regno Signed-off-by: David S. Miller

net: ipa: increase channels and events

2021-03-24T23:52:47Z

Increase the maximum number of channels and event rings supported by the driver, to allow the maximum available on the SDX55. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: use a separate pointer for adjusted GSI memory

2021-02-13T00:54:16Z

This patch actually fixes a bug, though it doesn't affect the two platforms supported currently. The fix implements GSI memory pointers a bit differently. For IPA version 4.5 and above, the address space for almost all GSI registers is adjusted downward by a fixed amount. This is currently handled by adjusting the I/O virtual address pointer after it has been mapped. The bug is that the pointer is not "de-adjusted" as it should be when it's unmapped. This patch fixes that error, but it does so by maintaining one "raw" pointer for the mapped memory range. This is assigned when the memory is mapped and used to unmap the memory. This pointer is also used to access the two registers that do *not* sit in the "adjusted" memory space. Rather than adjusting *that* pointer, we maintain a separate pointer that's an adjusted copy of the "raw" pointer, and that is used for most GSI register accesses. Signed-off-by: Alex Elder Signed-off-by: David S. Miller

net: ipa: do not cache event ring state

2021-02-06T22:57:17Z

An event ring's state only needs to be known when it is allocated, reset, or deallocated. We check an event ring's state both before and after performing an event ring control command that changes its state. These are only issued at startup and shutdown, so there is very little value in caching the state. Stop recording a copy of the channel's last known state, and instead fetch the true state from hardware whenever it's needed. In such cases, *do* record the state in a local variable, in case an error message reports it (so the value reported is the value seen). Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: support retries on generic GSI commands

2020-11-21T02:45:52Z

When stopping an AP RX channel, there can be a transient period while the channel enters STOP_IN_PROC state before reaching the final STOPPED state. In that case we make another attempt to stop the channel. Similarly, when stopping a modem channel (using a GSI generic command issued from the AP), it's possible that multiple attempts will be required before the channel reaches STOPPED state. Add a field to the GSI structure to record an errno representing the result code provided when a generic command completes. If the result learned in gsi_isr_gp_int1() is RETRY, record -EAGAIN in the result code, otherwise record 0 for success, or -EIO for any other result. If we time out nf gsi_generic_command() waiting for the command to complete, return -ETIMEDOUT (as before). Otherwise return the result stashed by gsi_isr_gp_int1(). Add a loop in gsi_modem_channel_halt() to reissue the HALT command if the result code indicates -EAGAIN. Limit this to 10 retries (after the initial attempt). Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: define enumerated types consistently

2020-11-18T23:53:48Z

Consistently define numeric values for enumerated type members using hexidecimal (rather than decimal) format values. Align the values assigned in the same column in each file. Only assign values where they really matter, for example don't assign IPA_ENDPOINT_AP_MODEM_TX the value 0. Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: cache last-saved GSI IRQ enabled type

2020-11-07T23:39:16Z

Keep track of the set of GSI interrupt types that are currently enabled by recording the mask value to write (or last written) to the TYPE_IRQ_MSK register. Create a new helper function gsi_irq_type_update() to handle actually writing the register. Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: rename gsi->event_enable_bitmap

2020-11-07T23:39:16Z

Rename the "event_enable_bitmap" field of the GSI structure to be "ieob_enabled_bitmap". An upcoming patch will cache the last value stored for another interrupt mask and this is a more direct naming convention to follow. Add a few comments to explain the bitmap fields in the GSI structure. Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: eliminate legacy arguments

2020-11-05T00:28:04Z

We enable a channel doorbell engine only for IPA v3.5.1, and that is now handled directly by gsi_channel_program(). When initially setting up a channel, we want that doorbell engine enabled, and we can request that independent of the IPA version. Doing that makes the "legacy" argument to gsi_channel_setup_one() unnecessary. And with that gone we can get rid of the "legacy" argument to gsi_channel_setup(), and gsi_setup() as well. Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski

net: ipa: use version in gsi_channel_program()

2020-11-05T00:28:04Z

Use the IPA version in gsi_channel_program() to determine whether we should enable the GSI doorbell engine when requested. This way, callers only say whether or not it should be enabled if needed, regardless of hardware version. Rename the "legacy" argument to gsi_channel_reset(), and have it indicate whether the doorbell engine should be enabled when reprogramming following the reset. Change all callers of gsi_channel_reset() to indicate whether to enable the doorbell engine after reset, independent of hardware version. Rework a little logic in ipa_endpoint_reset() to get rid of the "legacy" variable previously passed to gsi_channel_reset(). Signed-off-by: Alex Elder Signed-off-by: Jakub Kicinski